120results about How to "Increase the sedimentation rate" patented technology

Processes for producing acidic, protein-containing drinks are disclosed. Specifically, the processes comprise producing acidic, protein-containing drinks comprising plant protein material. The acidic, protein-containing drinks have improved sensory and functional characteristics such as reduced viscosity, improved sedimentation rate, and improved mouthfeel.

The invention provides a technology for preparing a needle coke raw material from coal-tar pitch. The technology comprises the following steps of 1, fully mixing asphalt and a solvent, and removing insoluble substances in the mixture by a physical separation method, wherein the solvent is a mixture of coal light oil and coal aromatic oil or is a mixture of BTX and coal aromatic oil; a mass ratio of the coal light oil or the BTX to the coal aromatic oil is in a range of (20: 80) to (95: 5); and a mass ratio of the solvent to the asphalt is in a range of 0.5 to 10, 2, feeding a clear liquor without the insoluble substances into a separator, and separating the light solvent from the clear liquor to obtain a heavy fraction having low QI, and 3, carrying out hydrotreatment on the heavy fraction in the presence of a hydrogenation catalyst at a temperature of 300 to 450 DEG C under the pressure of 5 to 20MPa. The needle coke raw material obtained by the technology has low sulfur content and a small expansion coefficient.

The invention relates to the method to recover super thin calcium carbonate, mainly including the following step: a, join the high macromolecule flocculating agent in green liquid, mix blend even then do away with to descend the sediments, stay the upper level clearness liquid to provide as refined green liquid; b, make the calcium oxide join in the water into the calcium hydroxide syrup, separate the syrup with impurity using the griddle net; c, mix the refined green liquid and the calcium hydroxide syrup, carry on the reaction, add crystal regulator; D: After the syrup responded, carry on the solid- liquid separate, rinse the sieve cake by hot water, take back the sieved liquid; E: prepare sieve cake and waters into suspended liquid syrup, put into the carbon dioxide, get the very thin calcium carbonate syrup.

The invention relates to a magnetic flocculant and a preparation method thereof, wherein the magnetic flocculant is cationic polyacrylamide-modified magnetic nanometer Fe3O4 particles. The magnetic flocculant provided by the invention retains the advantages of low dosage of organic high molecular flocculant, high flocculation speed, coexistence of salts, low pH value and temperature influence, low total amount of flocculating constituent and the like; and the superparamagnetism of the flocculant enables the flocculant to quicken the precipitation under the effect of an applied magnetic field and to realize quick and efficient separation of residual flocculant and flocculation. The magnetic flocculant provided by the invention has the advantages of simple preparation technique, low cost, easiness in amplification and no secondary pollution, and facilitates realizing efficient and economic flocculation operation.

The invention belongs to the field of water treatment, and particularly relates to a magnetic covalent bond type chitosan-based modified flocculant and a preparation method and application thereof. According to the invention, a cationic monomer and a hydrophobic monomer are introduced into chitosan molecules through a graft copolymerization reaction, so that the flocculant is ensured to have good stability, the electricity neutralization capability and the demulsification capability on oil droplets of the flocculant in a flocculation process are improved, the solubility of the flocculant is increased, the pH application range of the flocculant is widened, the dosage is reduced, meanwhile, the nano Fe3O4 has superparamagnetism, the settling performance of floc can be remarkably improved under the action of an external magnetic field when the nano Fe3O4 is introduced into the flocculating agent, and the settling time is shortened. Results of the embodiment show that the flocculant provided by the invention is good in lipophilicity and excellent in flocculation performance, and has efficient oil-water separation capacity, wider pH application range and excellent recoverability.

The invention provides an inorganic-organic hybridized flocculating agent and a preparation method of the inorganic-organic hybridized flocculating agent. The inorganic-organic hybridized flocculating agent is prepared from the raw material components: an initiator, and an inorganic flocculating agent and organic monomers at the mass ratio ranging from (1 to 9) to (1 to 6), wherein the organic monomers comprise dimethyl diallyl ammonium chloride and acrylamide at the mass ratio ranging from (1 to 9) to (1 to 5); the mass of the initiator is 0.02 percent to 5 percent of that of the organic monomers. The inorganic-organic hybridized flocculating agent is prepared through introducing the acrylamide and the dimethyl diallyl ammonium chloride into the inorganic flocculating agent and initiating two types of monomers to be subjected to in-situ copolymerization in an inorganic system. The inorganic-organic hybridized flocculating agent can be adaptive to sedimentation of electrified fine grained tailings through reasonably selecting raw materials and proportioning; the sedimentation speed of a tailing suspension solution can be remarkably improved under the condition that the adding amount is low, and the turbidity of supernatant is reduced; the treatment cost of wastewater is reduced and the quality of returned water is improved, and the aims of saving energy and reducing emission are realized.

The invention belongs to the technical field of urban sewage and sludge treatment and relates to a sludge dewatering conditioning agent and a deep dewatering method thereof. The invention discloses the novel sludge conditioning agent. The sludge conditioning agent comprises polyacrylamide and a coal pyrolysis product, namely semicoke; the invention also discloses the method for treating the sludge by using the conditioning agent; the method comprises the following steps: firstly, concentrating and dewatering the sludge by using the conditioning agent, wherein the BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and SS (Suspended Solids) of supernatant liquor after concentrating and dewatering can meet secondary sewage drain standard, and the water content of the treated sludge is less than 80%; then, directly filter-pressing and dewatering the concentrated and dewatered sludge, wherein the water content of the treated sludge is less than 50%. The used sludge conditioning agent is extremely strong in adsorption capacity, low in cost and excellent in performance; the sludge treatment process is simple, the dewatering time is short and the water content of the sludge is low; the dewatered sludge can be directly recycled without drying and dewatering, so that the sludge dewatering conditioning agent has good application prospect.

The invention discloses a process for preparing caprolactam end capping isocyanate binder emulsion, which comprises the following steps: firstly, dewatering caprolactam with vacuum under constant temperature, distilling toluene to remove water after adding molecular sieve, secondly, making caprolactam which is dried and toluene into solution to add into a three-necked bottle with a stirring condensing device, dripping toluene solution of 4, 4-diphenylmethane diisocyanate, scouring white solid which is obtained under reaction with nitrogen protection, and obtaining 4, 4-diphenylmethane diisocyanate of caprolactam end capping after vacuum drying, thirdly, milling the white solid of 4, 4-diphenylmethane diisocyanate of caprolactam end capping for 7-15 minutes, then adding host stabilizer, viscosity controlling stabilizer, defoaming agent and water, and obtaining lacte suspending liquid which is obtained through dispersion after 1.5-2.5 hours of milling, namely binder emulsion. The binder emulsion which is prepared by the invention has appropriate emulsion viscosity and settling rate, high stability and excellent dispersibility, and meets application requirements.

The invention relates to a deashing device for an SCR flue gas denitration system. The deashing device comprise a preposed ash bucket and a catalyst bed; the catalyst bed body is arranged in a shell; a guide plate is arranged in the shell; a flue gas outlet of an economizer is connected with the preposed ash bucket; the preposed ash bucket communicates with the shell through a horizontal flue, an uptake flue and the shell; an ash blocking plate is arranged on the joint of the preposed ash bucket and the horizontal flue; and an air-lock powder supply device or a gas blowing tube is arranged at an inner bottom end of the joint of the uptake flue and the horizontal flue. The device provided by the invention can effectively reduce abrasion, clogging and poisoning on the catalyst, caused by flue gas fly ash, increase service life of the catalyst and lower operating costs; on the other hand, the air-lock powder supply device or the gas blowing tube arranged at an elbow position of the horizontal flue can effectively remove dust accumulated in the device, ensure smoothness of the flue, reduce the weight of the device, ensure continuous operation of the system, and increase the overall economic benefits.

The invention relates to the field of resin materials and particularly relates to acid-resistant high-mechanical-strength magnetic acrylic-series weak acid cation exchange microspherical resin and a method of preparing same. The method includes steps of: a) coating a magnetic material with a silane coupling agent, and performing blending polymerization to the magnetic particles, coated with a silicon oxide layer and a hydrophobic layer, with an organic monomer to prepare initial polymerized blank spheres; b) swelling the processed initial polymerized blank spheres in a secondary monomer phase,and dispersing the blank spheres in a water phase to perform secondary polymerization in order to prepare magnetic polymer microspheres having an interpenetrating polymer network structure; c) hydrolyzing the material to prepare the resin. The resin is 50-500 [mu]m in particle size, is 40-65% in transformation swelling rate and is not less than 80% in roundness after abrasion. The resin is 0.05-1.0% in iron dissolution quantity after being soaked in a 1 mol / L hydrochloric acid solution for 24 h. The resin can be used for separation or removal of heavy metal ions, ammonia nitrogen and other cation substances in waste water, drinking water or natural water bodies.

The invention provides a slack coal pressure gasification wastewater resourceful treatment method. The treatment method sequentially comprises the following steps of: (1) performing oil-water separation on the wastewater to obtain wastewater after the oil-water separation treatment; (2) treating the wastewater obtained by the step (1) by use of active sludge, and performing mud-water separation to obtain wastewater after the active sludge treatment; (3) adding an adsorbent into the wastewater obtained by the step (2), and performing solid-liquid separation to obtain wastewater after the adsorption separation treatment; (4) adding a flocculating agent and / or flocculation aid into the wastewater obtained by the step (3), and precipitating to obtain wastewater after the coagulation clarifying treatment; and (5) treating the wastewater obtained by the step (4) by use of a filter material loaded with microorganisms to obtain dischargeable / recyclable water. The invention also provides a system for the method to realize resourceful treatment on the wastewater, and application of the treatment method or treatment system in treating slack coal pressure gasification wastewater.

The invention discloses a heteropolar electric charge fogdrop coalescence dust-removing device capable of removing tiny dust, especially, PM2.5, in smoke, and a method thereof. Two draught fans are respectively used for feeding dust-containing gas into an upper chamber; dust-containing gas dust and dust-containing gas flow enter into two pre-processing chambers and then downward pass through two filter screens, respectively; the filtered dust and gas flow downward enter into a negative electrostatic atomization area and a positive electrostatic atomization area, respectively; two capillary atomizing nozzles can form stable conical jet flow atomization in the negative electrostatic atomization area and the positive electrostatic atomization area under the actions of a negative corona discharge electrode and a positive corona discharge electrode correspondingly and can generate two heteropolar fogdrops or fogdrop groups in the negative electrostatic atomization area and the positive electrostatic atomization area so as to absorb tiny dust of the dust-containing gas; therefore, the efficiency of removing tiny dust is increased. The fogdrops absorbing dust can finish coalescence, so that the fogdrop scale is increased, the sedimentation of the fogdrops is facilitated, and the effective removal of ultra tiny particulate matter is realized.

The invention discloses a composite magnetic flocculating agent with an auto-catalytic degradation function. Inorganic magnetic composite micro-particles are used as cores, and polyacrylamide is bonded on the surfaces of the inorganic magnetic composite micro-particles to obtain the composite magnetic flocculating agent; the inorganic magnetic composite micro-particles comprise inner-layer magnetic ferriferous oxide, intermediate silicon dioxide coating layers and outer titanium dioxide coating layers. The invention further discloses a method for preparing the composite magnetic flocculating agent. The composite magnetic flocculating agent with the auto-catalytic degradation function and the method have the advantages that the contact efficiency of photocatalysts can be effectively improved, the flocculating performance of the composite magnetic flocculating agent can be enhanced, the composite magnetic flocculating agent is low in usage, sewage can be treated by the composite magnetic flocculating agent within short time, obvious sewage treatment effects can be realized, and the sewage treatment efficiency can be effectively enhanced; internal catalytic photo-degradation can be carried out on uniformly distributed titanium dioxide under the effect of ultraviolet light, breakage and degradation of macromolecular chains of the polyacrylamide can be accelerated, and secondary pollution due to natural degradation of the polyacrylamide can be effectively reduced; the method is implemented under mild conditions and is easy to control and implement.

The invention relates to the field of sewage treatment and aims to provide a spheroidal composite adsorbent for sewage treatment. The spheroidal composite adsorbent is prepared from 8-10 parts of lignin, 6-9 parts of sulfydryl modified polyacrylamide, 2-3 parts of sodium alginate, 30-40 parts of sulfydryl modified quartz sand and 20-30 parts of sepiolite. The spheroidal composite adsorbent has thefunctions of adsorbing and removing organic matter, suspended matter and heavy metals in sewage, and has the good removal effect on the heavy metals in the acidic sewage and has the integrated effectof adsorption, flocculation and sedimentation, the contents of COD, SS, lead, cadmium, copper and mercury in treated river channel sewage all reach the stipulations of national standard surface waterenvironmental quality standard GB3838-2002 of the People's Republic of China, and the removal rate of heavy metals in acid heavy-metal heavily polluted wastewater reaches 99% or above.

The invention discloses plasma vacuum coating equipment with the function of electrode and workpiece movement and a using method. The equipment comprises moving electrodes, a vacuum air exhausting device, a plasma vacuum cavity, a workpiece driving moving device, a plasma discharge source and an air inlet channel; the plasma discharge source and the vacuum air exhausting device are arranged on theexterior of the plasma vacuum cavity; and the moving electrodes and the workpiece driving moving device are arranged in the plasma vacuum cavity. The using method of the equipment comprises the following steps that the plasma vacuum cavity is vacuumized, and coating is conducted on a to-be-coated workpiece. According to the plasma vacuum coating equipment with the function of electrode and workpiece movement and the using method, the coating sedimentation rate and the coating production efficiency are improved by adopting a plasma-enhanced chemical vapor deposition method, the coating uniformity and consistency are improved, the protection effects such as water prevention, sweat prevention, moisture prevention, corrosion resistance and solvent resistance of a coating are improved, and theplasma vacuum coating equipment can be applied to various coating occasions such as PCBs, PCBAs, electronic products, electric appliance parts, electronic semi-products, metals, electronic components, semiconductors, integrated circuit boards and plastic products.

The invention discloses a method for rapidly judging stability of neutral high-fiber milk and belongs to the technical field of rapid dairy stability judgment. According to the method for rapidly judging the stability of the neutral high-fiber milk, the stability of the neutral high-fiber milk in shelf life is judged by measuring change conditions of viscosity, particles size and potential index before and after accelerated quality deterioration under constant temperature conditions of 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C. According to the method, the observation time of the stability of high-fiber milk products is greatly shortened, good or poor stability of the high-fiber milk products are basically judged within 10 days, the product development period is shortened, and the labor productivity is improved; the method has significance on developing products in dairy enterprises, and a gap of rapidly judging the stability of the neutral high-fiber milk is filled.

The invention discloses a soybean protein product special for minced fillet products. Great technological breakthrough is carried out on the color, the flavor and the sense of the soybean protein product, and the characteristics that a colloid is white in color and has no obvious objectionable odor such as beany flavor after the soybean protein product is dissolved into water and the taste is fine and smooth and is more close to minced fillet after the soybeam protein product is applied to the minced fillet products are realized.

The invention relates to a chitosan-based metal ion adsorbent as well as a preparation method and application thereof. The preparation method of the chitosan-based metal ion adsorbent comprises the steps: 1) dispersing amino surface modified SiO2 nano-powder into low-molecule alcohol, and adding citric acid for reaction, so as to prepare modified citric acid; 2) dispersing chitosan and an activator into low-molecule alcohol, and adding the modified citric acid obtained in the step 1) for reaction, thereby obtaining the chitosan-based metal ion adsorbent. According to the chitosan-based metal ion adsorbent provided by the invention, the citric acid and the amino surface modified SiO2 are introduced into a chitosan structure, so that the number of heavy-metal adsorption active sites of the adsorbent is increased, the adsorption capacity of heavy-metal ions is further enhanced; an adsorption product is easily separated from water through settlement and can be directly and effectively applied to sewage treatment.

The invention relates to special oil products for petrochemical products, in particular to special magnetic cutting oil and a preparation method thereof. The special magnetic cutting oil is suitable for lubricating, cooling, anti-attrition, and reducing attrition of tools in various processing methods of cutting, sawing, grinding, drilling, and the like of hard materials of non-metallic hard special magnetism, rock quartz, diamond, silicon crystal, and the like, and comprises the following components in percentage content by weight: 75% of base oil, 10% of animal and vegetable oil, 6% of extreme-pressure additive, 0.7% of anti-oxidant, 0.3% of static inhibitor, and 8% of oiliness additive. The special magnetic cutting oil has excellent lubricity and cooling performance, meets the requirement of enough lubricating and cooling performance of a tool and a processing workpiece, prolongs the service life of the tool, has favorable penetrating quality, ensures the surface of the processing piece to be bright, clean and smooth, and ensures lubricating and cooling during processing of non-metallic hard materials.

The invention provides a splicing device for pulling close fibulas on two sides after fibula section cutting osteotomy and belongs to the technical field of orthopaedic medical equipment. The splicing device is used for pulling close and fixing the broken ends of the fibulas on the two sides after the fibula section cutting osteotomy. The following technical scheme is adopted: after the row fibula osteotomy, a proximal steel plate and a distal steel plate are fixed with the fibulas on the two sides by use of fixing screws, respectively; the slot of the proximal steel plate and the spile of the distal steel plate are spliced and then connected and fixed by use of a connecting bolt, and therefore, the two ends of the cut fibulas can be pulled close, the outer-side tension of the knee joint can be enhanced manually and the varus deformity of the knee joint can be better corrected. The splicing device is reasonable in structure and firm in fixation, and is capable of effectively tensioning the cut ends of the cut fibula, increasing the fibula steeling rate and improving the surgical efficacy. The splicing device is the innovation of treating the osteoarthritis by use of the fibula osteotomy, and is capable of effectively avoiding the defects of the knee joint replacement and solving the problems not solved for a long time; as a result, the operation time and the recovery time can be greatly shortened, and excellent social benefit and economic benefit can be produced.

The invention relates to a Weibei dryland apple-sainfoin three-dimensional allocation standardized production technology. The Weibei dryland apple-sainfoin three-dimensional allocation standardized production technology includes the following steps: (1) determining the sowing time and the sowing amount, wherein sowing is carried out after early spring after apple trees sprout, or sowing is carried out after the rainy season in summer or autumn, and 3.0-4.0kg of seeds are sowed per mu; (2) determining the sowing mode, wherein an inter-line sainfoin planting mode is adopted for an apple grove with the planting density (the row spacing*the line spacing) of 2m*4m; (3) determining the clipping time, wherein clipping is not carried out in the first year after sowing, clipping is started to be carried out from the second year, the first-time clipping is preferably carried out before an early flowering season, clipping is carried out every 40-50 days afterwards, clipping is carried out three times in a whole year, the third year, the fifth year and the sixth year are the same as the second year in clipping time number, and clipping is carried out one time in the fourth year; (4) conducting field management. According to the Weibei dryland apple-sainfoin three-dimensional allocation standardized production technology, the grove soil nutrient is improved, the pest and disease damage is reduced, the yield and the quality of fruits are improved, the ecological environment is further adjusted, the carbon sequestration and oxygen production ecological value is increased, and the win-win effect on economic benefits and ecological benefits is achieved.

The invention provides an ethoxylated pentaerythritol core hyperbranched polymer taking dithiocarboxylate as a side group and an end group and application of the ethoxylated pentaerythritol core hyperbranched polymer as a heavy metal chelating agent, and relates to the technical field of chemical engineering and environmental protection. The chemical formula of the ethoxylated pentaerythritol corehyperbranched polymer is C[CH2OCH2CH2OCOCH2CH2N(CSSM)CH2CH2NHCSSM]4, wherein M is Na < + >, K < + > or NH4 < + >. The preparation method of the hyperbranched polymer is simple, raw materials are easyto obtain, and industrialization is easy. The hyperbranched polymer can be used as a heavy metal chelating agent, a special three-dimensional space structure of the hyperbranched polymer can be alternately chelated with heavy metals to form a compact ultra-large three-dimensional molecular combination with low solubility and strong stability, and wastewater and wastes containing the heavy metalscan be effectively treated.

The invention relates to a magnetic-field-strengthening iron-carbon-microelectrolysis method for treating organic pollutants in landfill leachate. The method comprises the steps of externally applying a magnetic field to the surrounding of a reaction tank, adding zero-valent iron and granular activated carbon into organic matter polluted wastewater in the reaction tank, and purifying the water under external-force stirring. According to the method, the organic pollutants in the landfill leachate can be effectively removed, the utilization ratio of the iron and the carbon is increased, the consumption of reagents is lowered, and the rate of reaction is accelerated. Once the reaction starts, the operation is simple and convenient and is easy to control; and the method is economical.

The invention discloses a positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method. The system comprises a vacuum water-gas separation device, a vacuum pump, a water suction pump and an air compressor, and further comprises vertical drainage plates, a main pipe and branch pipes, wherein the branch pipes communicate and gather the multiple vertical drainage plates together; the multiple branch pipes are gathered and communicate with the main pipe; the vertical drainage plates, the branch pipes and the main pipe communicate to form a pipe assembly;the pipe assembly is provided with a joint detachably connected with downstream equipment; when the detachably connected joint of the pipe assembly is connected to a water inlet of the vacuum water-gas separation device, the vacuum pump provides vacuumizing to form the negative pressure vacuum preloading soft foundation reinforcing system; and when the detachably connected joint of the pipe assembly is connected to the air compressor, the air compressor provides high-pressure gas to the pipe assembly to form a positive pressure pressurizing system. The system accelerates the soft soil foundation settlement speed, shortens the treatment period, increases the soft foundation treatment effective depth, effectively controls post-construction settlement, and achieves the excellent engineering application prospect.

The invention relates to a treatment device for ternary water produced from oil fields and a use method thereof, in particular to an ozone oxidation viscosity reduction treatment device for ternary water produced from oil fields and a use method of the device. The device aims to solve the technical problems that storage of additional oxidation agents during existing oxidation viscosity reduction treatment of ternary water produced from oil fields has potential safety hazards, new precipitates are generated in the treatment process, the oxidation efficiency is low, the loss of oxidants is large, pollution caused by ozone catalysts is serious, and blockage issue is likely to be caused. The treatment device comprises three parts including an ozone adding unit, a catalytic oxidation unit and apostreaction unit; the catalytic oxidation unit consists of columnar catalytic oxidation reactors which are in three-level series connection, the columnar catalytic oxidation reactors are internallyprovided with platy catalyst combination modules which are regularly arrayed, and the vertical surfaces of platy catalysts are always tangent to the direction of water flow. The postreaction unit is atank body of an integrated structure with an air / liquid separation function and an air floatation function.

The invention provides a harmless treatment method of cyanide-containing tailings, and belongs to the field of mine waste residue treatment. The harmless treatment method of the cyanide-containing tailings comprises the following steps that immobilization treatment is carried out on the cyanide-containing tailings through pretreatment, wheel grinding mixing and digestion steps; a consolidating agent and a cementing material are added into the cyanide-containing tailings after immobilization treatment to consolidate and prepare harmless filling materials; the harmless filling materials are cured, and the materials are piled into a tailing pond; and according to the pretreatment, multifunctional water-soluble polymer is added to the cyanide-containing tailings, and the mixture is sent into aconcentration tank, stir and filter pressing are carried out to obtain concentrated ore pulp. According to the harmless treatment method of the cyanide-containing tailings, the cyanide-containing tailings are used for preparing the filling materials which are not compatibilized, do not greatly shrink, have excellent compressive strength, do not have cyanide toxicity, and have good freezing-thawing resistance and heat resistance. The treatment method has mature process, high settling rate, large cyanide capture amount, cost saving, construction in all seasons, less reagent consumption, large treatment amount, continuous treatment, low energy consumption, and can realize sustainable development of economy, society and environment.

The invention discloses a spiral flow diversion and hydrocyclone separation settling device. The spiral flow diversion and hydrocyclone separation settling device comprises a tank body, an overflow opening, a flow diversion cone, a flow diversion cap, an oil discharging opening, a slag discharging opening, a water collection opening, a water draining pipe, a water outlet, an upper filter plate, padding, a lower filter plate, a man hole, a spiral flow diversion tank, a water inlet, supporting legs and a sewage draining opening. According to the spiral flow diversion and hydrocyclone separation settling device disclosed by the invention, a spiral flow diversion and separation device is adopted, and the hydrocyclone separation effect is increased; the water outlet can be formed in the middle part of the tank body, so that stability of water quality of effluent water is realized, and dross is prevented from entering subsequent pipelines and equipment along with the effluent water; through arrangement of a padding layer, suspended matters can be effectively intercepted, and the suspended matters sink and fall into the spiral flow diversion tank when the gravity generated by gathering and accumulation of the suspended matters is greater than the buoyancy force of a treatment medium, so that the separation effect is achieved; double functions of hydrocyclone separation and gravity separation are utilized, so that the sedimentation rate is increased, standing time is not needed, and continuous settling separation can be realized.

The invention discloses a spraying dust-falling device for constructional engineering, belonging to the technical field of building construction. The spraying dust-falling device comprises a supporting box, wherein a filter screen is fixedly embedded in the side wall of a fixing sleeve, and an angle adjusting mechanism for driving a supporting plate to rotate is arranged in the supporting box. According to the invention, water in a water tank is pumped, atomized and sprayed through an arranged spraying mechanism, and an arranged air blowing mechanism blows air to the water, so the spraying range of the water is effectively expanded; an telescopic adjusting mechanism can achieve stretching and retracting of an extending sleeve relative to a fixed sleeve, so free adjustment is achieved according to a dust falling position; an arranged swing mechanism can achieve a reciprocating swing driving effect on a guide air pipe, and atomized water is sprayed in a swing mode in the swing process of the guide air pipe, so a dust falling range is remarkably widened; and an arranged angle adjusting mechanism can flexibly adjust the elevation angle of the guide air pipe, so the flexible adjusting effect of a sprayed dust falling area is achieved, and the settling rate of dust in the air is greatly improved.

The invention discloses a method and a device for treating heavy metal waste water by an ambient-temperature ferrite cycle treatment process. The method comprises the following steps of: S1, firstly adding ferrous sulfate heptahydrate into waste water to obtain a mixture, and aerobically stirring the mixture uniformly at the ambient temperature; adding sodium hydroxide into the mixture, and stirring the mixture for 15-30 minutes by isolating air; S2, then, naturally settling the waste water, and carrying out solid-liquid separation on the waste water after settling; S3, after solid-liquid separation, discharging a supernatant liquid and getting out lower-layer sludge for later use; S4, adding sodium hydroxide into the sludge and stirring the sludge for 15 minutes in air to obtain magnetic sludge; and S5, adding the magnetic sludge and the ferrous sulfate heptahydrate in step S1 into the waste water. According to the method, various heavy metal ions in waste water can be effectively removed once at the ambient temperature; the reaction time is short; the water quality of the discharged water is high; sludge in a cyclic process has magnetism; and the magnetic sludge can be recycled.