222results about How to "Short equilibration time" patented technology

A device for on-line testing solved gas distribution constant in transformer oil by gas-phase chromatography includes a constant temperature water-bath, a magnetic mixer, an oil-gas balance bottle, a six-way valve and an on-line gas-phase chromatograph to accurately test solved gas distribution constant in transformer oil under different temperatures.

A built-in high-speed spindle double-sided on-line dynamic balance device and a control system thereof belong to the fields of the precision and ultra-precision processing and the automation. The reconfiguration of the unbalance amounts of two balancing heads on a spindle system is controlled to change the unbalanced state of the system. The balance disc of each balancing head is pushed by an oil bag-friction resistant reed mechanism, wherein a 120-degree angle is formed between the oil bag and the friction resistant reed circumferentially. A reset reed is used to ensure that the balance discs are closely meshed with the spindle in normal operation. In the separation process, the reset reed is used to ensure that the balance discs perform differential motion relatively to the spindle stably. The control system can be used to realize the schemes such as multi-path signal simultaneous acquisition, signal parallel processing and multi-path signal parallel output and reduce the balance time; and the system combines the oil drainage advanced angle to output control signals, adjust the positions of the four balance discs respectively and increase the control accuracy.

The invention discloses a fast recognition method for the unbalance amount of internal and external rotors of a synchronous double-rotor system and includes that 1) the internal and the external rotors are provided with a reference signal sensor and the external rotor is provided with a vibration detecting sensor; 2) a marked line is added on any random circumferential direction of the internal and the external rotors, the circumferential direction is marked with angles and the lines of 0 degree of the internal and the external rotors are coincident; 3) the connecting mode of a transfer flange in a differential mechanism is changed to lead to rotating synchronously; 4) unbalance amount M is obtained by test weighing for twice on the external rotor; 5) a machine is stopped, after the internal and the external rotors are staggered at an angle of Alpha 0, the machine is led to rotate synchronously again and M' left is obtained by test weighting for twice on the external rotor; 6) M left inner, Alpha, M left outer and Beta of a left regulating surface are obtained; 7) each unbalance amount of a right regulating surface is obtained in a similar way; 8) the obtained unbalance amount is arranged on the opposite surface of the unbalance amount of the left and the right regulating surfaces to finish the balance of the whole machine. The invention effectively solves the difficulty that the internal rotor can not get a reference signal, avoids the defect of needing test weighting, reduces the balance time in large scale and improves the balance efficiency.

A method of a pretreatment that is a desilication of bauxite surface by a reverse flotation relates to a method of the flotation towards diasporic bauxite, including the courses of grinding, a solid-liquid separation and the reverse flotation. The method is characterized in that before the desilication of the bauxite mineral by the reverse flotation, the surface of the mineral is pretreated by hot alkaline solution. The method of the intention can make a concentrate grade (an alumina-silica ratio) after the desilication by the reverse flotation improved 0.5 to 1 than the concentrate grade after the ordinary desilication by the reverse flotation and make a coefficient of recovery increase by 2 percent to 8 percent. The chemical entrainments of coarse particles are greatly reduced. A concentration adjustment of the flotation system of the present invention is convenient, and the balancing time is short, at the same time novel water can be used for further washing a red mud, which can reduce an alkalescence of the red mud and decrease the pollution influence on environment. The water after washing red mud is added into a grinding machine for the treatment of ore surface as the recycle utilization.

The invention relates to a nitrogen hybridized magnetic ordered meso-porous carbon adsorbent. The aperture of the adsorbent is within 3.8nm, the surface part of the adsorbent is graphitized, and the adsorbent comprises magnetic nano particles; the magnetic nano particles are iron oxide nano particles and iron nano particles. A preparation method of the adsorbent comprises the following steps: adding a meso-porous silicon SBA-15 template into an organic solution which contains furfuryl alcohol and ferric nitrate and is easy to volatilize, sufficiently mixing, performing thermal polymerization, subsequently carbonizing on the presence of an inert gas, finally removing silicon by using a strong alkali solution, and separating, washing and drying so as to obtain magnetic ordered meso-porous carbon; and dissolving the magnetic ordered meso-porous carbon into a strong acid solution, controlling the temperature to be less than 5 DEG C, adding aniline and ammonium persulfate, sufficiently mixing, washing and drying the complex after polymerization, and carbonizing on the presence of the inert gas so as to obtain the nitrogen hybridized magnetic ordered meso-porous carbon adsorbent. The adsorbent is high in adsorption efficiency, large in adsorption volume and short in adsorption balance time.

The invention provides a device for measuring specific heat ratio of air under different temperatures, which comprises an air storage bottle, a pressure sensor and an air temperature testing sensor which are arranged in the bottle, wherein an air charge part and an air discharge part are fixed on the air storage bottle. The device is characterized in that the device further comprises a temperature display and control device which is arranged around the air storage bottle. The temperature display and control device comprises a heat bath container, an electric heating part, a bath temperature testing sensor and a microcontroller, wherein the electric heating part and the bath temperature testing sensor are fixedly arranged in the heat bath container and are electrically connected with the microcontroller. The invention further provides a method for measuring the specific heat ratio of the air under different temperatures through above device. The device and the method can ensure that the air temperature can be at a precise range, enriches the experimental teaching contents and improves the learning initiatives of the students.

The invention provides a method for extracting citric acid and / or sodium citrate from fermentation liquor by an extraction method. In the method, a mixed solution of tertiary amine and high alcohol is used as a complex extracting agent for carrying out multilevel cross-flow extraction on citric acid fermentation liquor, and pure water and / or a NaOH aqueous solution is selected to carry out back extraction on an extraction phase. A more ideal extraction distribution coefficient can be reached by using the mixed extracting agent of the tertiary amine and the high alcohol to extract a filter-press clear citric acid solution, and the extraction yield by utilizing the multilevel cross-flow extraction can reach more than 98 percent. The extraction phase is back extracted by utilizing the pure water or the NaOH solution so as to prepare citric acid and sodium citrate aqueous solutions being suitable for concentration and crystallization.

The invention provides a microwave-induced catalytic oxidization method of high-concentration organic wastewater. The method comprises the following steps: A, preparing activated carbon, silicon carbide, activated carbon fibers and carbon nanotube loaded metal catalysts through a dipping-microwave, dipping-roasting or ethylene glycol liquid phase chemical reduction method; and B, adding the obtained catalysts into wastewater containing organic substances; and charging oxidant gas or liquid for oxidizing the organic substances in the wastewater into inorganic small molecular compounds through microwave, thus achieving the purpose of reducing pollutant mission. According to the method for treating the organic wastewater, the activated carbon, silicon carbide, the activated carbon fibers andthe carbon nanotubes are used as the catalyst carriers; the service life is long; the catalyzing activity is high; the wastewater treatment condition is mild; and other advantages are also realized.

The invention provides a multi-component direct-competitive immunoassay method for labeling haptens by using quantum dots of micromolecule organic matters and relates to a multi-component direct-competitive immunoassay technology. The multi-component direct-competitive immunoassay method comprises the following steps of: labeling different target analyte haptens by using the highly-efficient water-soluble quantum dots with different fluorescence emission wavelengths, taking polystyrene magnetic microspheres on which different antibodies are fixed and commonly dispersing corresponding target analyte prototypes as well as the haptens labeled by the corresponding quantum dots in phosphate buffer solution to carry out competitive immune response; and quickly separating the polystyrene magnetic microspheres from a liquid phase in a magnetic field by using a reaction balance system, carrying out fluorescence scanning or multi-wavelength detection on the liquid phase under the excitation of ultraviolet light with the same wavelengths and establishing the multi-component direct-competitive immunoassay method for quickly detecting the haptens labeled by the quantum dots of the various target analyte micromolecule organic matters according to the principle that the ratio of the characteristic fluorescence intensity of labeling the haptens by using the ratio of the fluorescence intensity of the different quantum dots in a prototype system to the fluorescence intensity of corresponding blank control is proportional to the concentration of a corresponding target analyte.

The invention relates to a double-workpiece-platform same-phase rotation exchange method based on parallel mechanisms, and a device of the method, belonging to a technology of semiconductor manufacturing equipment. The device comprises two workpiece platforms, a rotary transfer platform and the two parallel anti-rotation mechanisms; in the rotating exchange process of the two workpiece platforms,the two workpiece platforms are caught and blocked by the rotary transfer platform which rotates around the center of a base station, so that the exchange between an exposure station and a pretreatment station can be realized; and the rotation of the two workpiece platforms can be controlled by the parallel anti-rotation mechanisms, so that the two workpiece platforms can be ensured to have the same phase in the exchange process. The invention solves the problems that the existing scheme for exchanging the platforms in a linear way is high in impact torque and more in platform exchange beats,the existing scheme for exchanging the platforms in a rotating way is reverse in phases of the two workpiece platforms, cables are wound, a target of a laser interferometer is lost, and the like; a smaller mass balance system is adopted, so that the balance time is better shortened, the system is simplified, the cost is reduced, the platform exchange beats are reduced, the time for exchanging theplatforms can be reduced, and the yield of a photoetching machine is effectively improved.

The invention provides a thermal resistance test system, which includes a temperature-controllable heat sink, a thermal-resistance-varying module, a heat flow sensor, a temperature sensor, and a signal processing and control unit. The system performs a thermal resistance test through a thermal-resistance-varying compensation method; during work, the thermal-resistance-varying module can compensate the system with a heat flow, which is symmetric to a to-be-tested object on the basis of the heat flow sensor, so that heat flow output of the heat flow sensor is zero; and as a result, the thermal resistance value of the to-be-tested object is equal to that of the thermal-resistance-varying module. The compensation method can reduce and eliminate interference and test error, wherein the thermal-resistance-varying module can adapt with different to-be-tested objects having different thermal resistance values by pre-calibrating the varying rule of thermal resistance. The thermal resistance test method and the thermal-resistance-varying compensation method has excellent environment adaptability, short measurement time, high measurement precision and stability and low detection cost, is convenient to install and use on site, and greatly develops the application field of steady-state thermal resistance test methods.

The invention discloses a process for separating and recovering minim organic solvent from waste water using ion liquid consisting of, mixing hydrophobic ionic liquid with aqueous solution of organic solvent whose concentration is lower than 0.1-10 wt% by the volume ration of 1 : 1-10, fully stirring and depositing for stratification, gathering the organic solvent in the aqueous phase into ionic liquid phase, separating the ionic liquid phase, evaporating the organic solvent in the ionic liquid through decompression, thus achieving the goal of reclaiming organic solvent.

The invention discloses a capillary electrophoresis analysis system utilizing a micro-injection pump to drive liquid flows. The capillary electrophoresis analysis system comprises a direct-current high-voltage power supply, a nanoliter sample-injection valve with a built-in nanoliter sample ring, the micro-injection pump, a capillary three-way valve, a separation capillary, a detector and an electrophoresis waste liquid bottle with an electrophoresis buffer solution and a bottle plug. The capillary electrophoresis analysis system utilizes the micro-injection pump to drive liquid flows at a flowing rate of nL / min so that the liquid flows can integrally move in the capillary from a positive pole to a negative pole, and the liquid flows driven by the micro-injection pump replace electroosmotic flows so that all ingredients of the sample are separated because of different electrophoresis speeds. The capillary electrophoresis analysis system has the characteristics of high separation efficiency, fast analysis speed, simple processes and good reappearance.

The invention is applied to the technical field of rare earth metal adsorption, and in particular relates to a metal organic framework material with a petal-shaped core-shell structure and a preparation method and application thereof. The preparation method is as follows: 1) zirconium tetrachloride, 2-aminoterephthalic acid, glacial acetic acid and N, N-dimethylformamide are taken and stirred at room temperature, then transferred into a hydrothermal reaction kettle to react for 24 hours at 120 DEG C, cooled to room temperature, and washed to obtain UiO-66-NH2; and 2) weighing and ultrasonically dispersing the UiO-66-NH2 in absolute methanol, adding PVP for stirring, adding zinc nitrate hexahydrate for stirring, then adding 2-methylimidazole, stirring and centrifugally drying to obtain petal-shaped core-shell structure adsorbent UiO-66-NH2@ZIF-8. The preparation method is simple, green and pollution-free, and the prepared adsorbent has high separation and enrichment efficiency for rareearth elements and practical applicability.

The invention discloses composite covered spandex yarns and a preparation method thereof. Each composite covered spandex yarn comprises a spandex core filament and a yarn which covers the spandex core filament, wherein the yarn which covers the spandex core filament formed by twisting two kinds of chemical filaments or formed by twisting a chemical filament and a natural fiber. The preparation method comprises the following steps of: doubling and softly twisting two kinds of fiber yarns by using a draw twister, wherein the speed is 450 to 550 meters per minute, and the twist degree is 70 to 90 twists per meter; covering 20D spandex filaments by using the softly twisted yarns, wherein the spindle speed is 1,000 to 1,300 revolutions per minute, the twist degree is 500 to 700 twists per meter, and the drafting ratio is more than three times; and performing heat setting at the temperature of 40 to 60 DEG C and 65 to 75 DEG C to ensure tension balance inside and outside a yarn spool.

The invention provides an enrichment-thermal desorption-chromatography separating unit. The enrichment-thermal desorption-chromatography separating unit is composed of a rapid enrichment thermal desorption device, a sample introduction device, and a rapid separating device; the rapid enrichment thermal desorption device is used for realizing low temperature enrichment of target components in gas samples using an adsorption tube at the action of low temperature of carbon dioxide gas, and realizing rapid heating thermal desorption via a heating wire, wherein an adsorbent is arranged in the adsorption tube, and the adsorption tube is enwound by the heating wire; after enrichment and desorption, the target components are delivered into the rapid separating device via the sample introduction device; a low temperature carbon dioxide gas cooling chromatographic column is adopted in the rapid separating device, relatively low chromatographic column initial temperature and relatively high heating rate are achieved via combination of the low temperature carbon dioxide gas cooling chromatographic column with a rapid heating module, so that high separation effect, extremely high analysis speed, and high peak capacity are achieved. The enrichment-thermal desorption-chromatography separating unit is capable of realizing on-line enrichment, rapid desorption, and super rapid gas chromatography of trace components in gas samples.

The invention discloses an on-line coupling system for a dynamic liquid-liquid solid imprinted microextraction-liquid phase chromatogram, which comprises a magnetic agitator, a water bath bottle, an extracting bottle, a draft tube, a peristaltic pump, a high-pressure six-way switching valve, a molecularly imprinted solid phase extracting material, a high-pressure six-way sample valve, a quantifying cup, a sample needle, a liquid phase chromatographic pump, a chromatographic column, a detector, a liquid phase chromatogram and the like. Through the coupling of a dynamic liquid-liquid solid imprinted microextracting device and the liquid phase chromatogram, the on-line overall processes of the preenrichment, the extraction, the desorption, the separation and the detection of a target analytein a water phase sample are achieved. By using the system, the universality of liquid-liquid extraction, the high selectivity and the high enrichment capability of a molecularly imprinted solid phasemicroextraction technique, the efficient separation capability and the high sensitivity of the liquid phase chromatogram are combined; the analysis degree of automation is improved; the analysis timeis shortened; the accuracy and the precision are improved; and the system can be effectively applied to the analysis and the detection of a trace organic matter in a complicated sample.

The invention discloses an environment-friendly absorbing material for lead-containing industrial waste water. The environment-friendly absorbing material comprises the following substances in parts by weight: 3-5 parts of diluted hydrochloric acid, 6-9 parts of calcium carbonate, 9-14 parts of barium carbonate, 12-17 parts of vinyl-tri-(2-methoxyethoxy)-silicane, 3-7 parts of isodecyl acrylate, 2-6 parts of isopropyl acrylate, 50-60 parts of shaddock peel, 3-8 parts of acrylic high-molecular water absorbing resin, 3-5 parts of bentonite, 1 part of carboxymethyl methyl cellulose, 1 part of hollow glass microbead, 9-16 parts of nano silica gel and 4-6 parts of nano-level zinc oxide. The environment-friendly absorbing material disclosed by the invention has the beneficial effects that the surface area is large, the absorbing capability is strong, simultaneously, the diffusion resistance is low, the balance time in the absorbing process is short, and the whole process is fast and efficient. The adsorbed magnetic nano material can be regenerated for reuse.

A multi-stage series continuous rectification separation apparatus for light hydrogen molecular water and a method are disclosed. The apparatus is composed of more than one stages of rectifying towers in serial connection. The operation pressure in all stages of rectifying towers is reduced stage by stage from front to back. After being gasified by a vaporizer, natural water enters first stage rectifying tower, and continuously flows in all stages of the rectifying towers stage by stage for rectification separation, and by utilizing the vapor pressure difference between light hydrogen and heavy hydrogen isotopes, the rising vapor-phase material in each stage of the rectifying tower is fully contacted with the decreasing liquid-phase material, the mass transfer process of vaporization and condensing continuously happens, light hydrogen isotope enters the vapor phase stage by stage, and heavy hydrogen isotope enters the liquid phase stage by stage, so that the abundance of light hydrogen isotope in the vapor-phase material is improved stage by stage, and finally light hydrogen molecular water is discharged from a cooler. By adjusting the ratio of the final-stage product to the backflow liquid, the light hydrogen molecular water with the light hydrogen abundance of 99.9999-99.9865% can be obtained. The apparatus possesses the advantages of high separation efficiency, low energy consumption, simple structure and easy operation, and is suitable for continuous production of light hydrogen molecular water.

A micropore structure of a microplate strip comprises round micropore in a standard format. A plurality of convex tooth strips in the same shape and proportion are arranged in an equant manner on the annular wall of the lower part of the inside of each micropore, the bottoms of the convex tooth strips are connected with the bottom of the micropore, and the sides of the convex tooth strips are connected with the annular wall of the micropore. The surface area formed by the convex tooth strips convex inward is much greater than the surface area of the inner cavity of the conventional micropore, so the solid-liquid interface of the same volume of reaction solution has a greatly increased reaction area that is favorable for complete immunoreactions, and luminous reaction or enzyme catalyzed reaction and contributes to the great reduction in time for reaching reaction equilibrium, improvement in detection flexibility and reduction in time for detection; the convex tooth strips improves both the reaction area and an optical signal compared with the conventional micropore structure and increases the strength of the detection optical signal of a luminometer; the top parts of the convex tooth strips are inclined sectors which are capable of reflecting the optical signal of the luminous reaction upward to a probe of the luminometer, and compared with the reaction of the micropore side wall of the conventional microplate strip, the optical signal of the probe is strengthened considerably and the flexibility of a method is improved.

The invention discloses a technology for preparing clathration adsorbing material by utilizing raw material containing calcium as the skeleton. The raw material containing calcium (calcium oxide, calcium chloride, calcium sulphate, calcium carbonate, etc.) in the medium of a colloidizing agent is mixed with sodium carbonate or carbon dioxide in the air to react in water solution. An acid red 138 organic matter is adopted as clathration material and precipitation and separation are carried out to prepare calcium-based adsorbing material, thereby being used for absorbing and separating dyes, organic pollutants, heavy metals, and the like, thus having important application value in the fields of industrial waste water disposal, useful resource recovery, etc. The technology can utilize waste water and wastes of enterprises as raw materials to realize the resource recycling of wastes. The technology of the invention has the advantages of low cost of raw materials, the simple preparation method, materials with good absorbing performance, low processing costs and easy settlement separation, and the like while waste residues can be dissolved by acid to retrieve useful materials.

The invention discloses a fire pump discharge pressure full-automatic balancing system, which comprises a CPU microprocessor, a power isolation voltage stabilizing module, a power isolation module and an operation panel, wherein the operation panel and the power isolation voltage stabilizing module are respectively connected to the CPU microprocessor; the fire pump outlet pressure full-automatic balancing system also comprises a pressure sensor connected to the CPU microprocessor through an operational amplifier, a rotational speed sensor connected to the CPU microprocessor through a photocoupling module; the power isolation module is respectively connected to the pressure sensor and the rotational speed sensor; and the CPU microprocessor is connected to an automobile ECU accelerator control port through a high-isolation photocoupling amplifier. Compared with the prior art, the fire pump outlet pressure full-automatic balancing system has the advantages of using the method for controlling the vehicle-mounted fire pump pressure through changing the rotational speed of an automobile engine to automatically balance the working pressure of the fire pump under the set pressure of a user, thereby changing a plurality of defects caused by manual pressure adjusting and mechanical pressure balancing of the vehicle-mounted fire pump. The fire pump outlet pressure full-automatic balancing system has the advantages of accurate balancing pressure numerical value, short balancing time and easy mounting.

The invention discloses a method for separating palladium and copper from a solution containing copper, cobalt and nickel. The method employs acylthiourea as an extractant and melted wax as a diluent, Pd and Cu in the copper cobalt nickel palladium system can be selectively separated with a high recovery rate (the recovery rate of Pd and Cu can reach 99.9%) by controlling an acidity of copper cobalt nickel palladium system. According to the invention, the method for extracting palladium has the advantages of short balance time, high enrichment degree and fast phase-splitting; palladium and copper can be continuously extracted and separated from an acidic aqueous solution containing palladium at a time. The extractant enables a recycling use, and has small harm on environment, which has significant meaning for improving the recovery rate of non-ferrous smelting of the precious metals.

A target control method of a liquid-type on-line autobalance device comprises the following steps: extracting a frequency doubling signal of measured equipment from the received real-time vibration signals; calculating the unbalance magnitude and phase of the measured equipment by using the frequency doubling signal; converting the unbalance magnitude to distributed data of liquid in a liquid storage chamber when a balancing device offsets the unbalance magnitude, and forming time control amount of liquid transferring in the liquid storage chamber by liquid infusing or gas driving; according to the unbalance magnitude and phase, dividing the time control amount into the control duration of the liquid storage chamber; and outputting a control command based on the control duration of the liquid storage chamber to control the infusing or flowing of liquid in the liquid storage chamber. The control method can offset vibration, and enables the measured equipment to keep accurate dynamic balance during the operation. The invention further comprises a target control system, which enables the vibration value of the measured equipment to be reduced monotonically, and saves the balance time.

The present invention relates to an equipment and the operation method for continuous penicillin stripping. An extraction tower is controlled by a computer control system; a cylindrical tower reaction extraction section adopts a jacketed structure; a clarification section container on the upper end of the tower body is larger than a clarification section container on the lower end of the tower body; a tower body extension section that extends into the upper clarification section container is bended outwards after a certain length of extension; a reflux hole is arranged on a straight tower body on the tower body extension section; an arc-shaped baffle plate with a downward arc core is arranged over the tower body extension section; a central shaft with a tower plate enters into the top of the upper clarification section container to make the bottom of the central shaft landed in a central shaft slot; a light phase distributor, a pH meter probe and a light phase in a heavy phase clarification area are arranged in the lower clarification section container; a laser particle size analyzer is arranged on a flange which connects the upper clarification section container with the tower body; a polarimeter is arranged on a pipe on an organic extraction raffinate phase exit. The invention can effectively inhibit the problems of penicillin degradation and milk slag handling, which can be applied to large-scale penicillin production through on-line automation control.

The invention belongs to the field of rare earth hydrometallurgy and the field of ionic liquid extraction, and particularly relates to a method for extracting a rare earth element with N-octylpyridinium tetrafluoroborate. According to the method, an aqueous solution containing a light rare earth element is used as the feed solution, the acid feed solution is mixed with the N-octylpyridinium tetrafluoroborate to conduct liquid-liquid extraction, and the mixed solution obtained after extraction is subjected to centrifugal separation so that an organic phase loaded with rare earth and raffinate can be obtained. A back washing agent is adopted to reversely extract the organic phase loaded with the rare earth, and the mixed solution obtained after reverse extraction is subjected to centrifugalseparation to obtain a pure rare earth solution and recycled ionic liquid. By adoption of the method, extraction efficiency is high, extraction equilibrium time is short, no emulsion phenomenon exists, and operation is easy. Moreover, the N-octylpyridinium tetrafluoroborate has hydrophobicity and cannot be dissolved with the aqueous solution, and thus organic phase losses caused by aqueous phase entrainment or dissolution can be reduced.

The invention relates to a production method and a production device of chemical products, in particular to the production method of doubly labeled water consisting of deuterium and heavy oxygen O<18> enriched by a water reification method as well as a water rectification device thereof. The rectification device provided by the invention consists of a rectification tower in multilevel series or in multilevel and parallel series; each level of the rectification tower are connected in phase transition way; the connection way is to transport the steam in tower bottom to the top of the lower tower by using pressure difference and the steam is condensed to be liquid phase to enter lower level tower; ascending steam of the lower tower top is condensed to be liquid phase and then flows into higher level tower top automatically. In the invention, as a reboiler at the tower bottom adopts falling film evaporation, the tower bottom is dry all the time without the retention of liquid to greatly save the balancing time. On the other hand, as no rotating parts such as a pump, etc. is adopted, the possible troubles caused by leakage, power failure, mechanical fault, etc. can be avoided to ensure constant and reliable operation of the system, which is important for isotope separation.

The invention discloses a method for removing lead in a water body by using magnetic pig manure biochar. The method comprises the steps as follows: magnetic pig manure biochar is added to the lead-containing water body, the pH value of the water body is controlled between 2 and 7, and constant-temperature vibrating treatment is performed to adsorb lead in the water body. The magnetic pig manure biochar is prepared in the following steps: (1) pretreated pig manure is subjected to high-temperature pyrolysis in nitrogen and pig manure biochar is obtained; (2) a pig manure biochar dispersion liquid is prepared, a ferric iron salt solution and a ferrous iron salt solution are mixed and stirred, and an iron salt mixed solution is prepared; (3) the pig manure biochar dispersion liquid and the iron salt mixed solution are mixed and stirred, the pH value is adjusted, boiling, filtration, washing and drying are performed, and the magnetic pig manure biochar is obtained. The method has the advantages of being simple to operate, low in cost, capable of quickly and efficiently adsorbing lead, easy in separation and recovery, reusable, environmentally friendly and the like.

The invention discloses a rotary exchanging method and a rotary exchanging device for double workpiece platforms based on synchronous steering of a turntable gear and belongs to semiconductor manufacturing equipment. The device comprises a rotary platform switching device consisting of a rotary motor stator, a rotary motor rotor, a rotating platform embedded in a base station and a rotary platform switching gear, wherein a liftable first shaft coupling device and a second shaft coupling device are arranged on the rotary platform; a first workpiece platform rotating shaft is arranged at the bottom of a first workpiece platform; a first workpiece platform switching device is arranged on the lateral surface of the first workpiece platform; a first workpiece platform gear is arranged at the waist part of the first workpiece platform; a second workpiece platform rotating shaft is arranged at the bottom of a second workpiece platform; a second workpiece platform switching device is arrangedon the lateral surface of the second workpiece platform; and a second workpiece platform gear is arranged at the waist part of the second workpiece platform. According to the rotary exchanging methodand the rotary exchanging device disclosed by the invention, in the switching process of double platforms, the orientations of the workpiece platforms are always kept unchanged and the problems that a cable in a traditional rotary platform switching scheme is not convenient to mount and an interferometer loses a target are solved; and meanwhile, the rotary exchanging method and the rotary exchanging device disclosed by the invention have the advantages that a rotational inertia in the specific implementation process is small, the required torque under the same platform switching time is smalland the like.