169results about How to "Low raw material requirement" patented technology

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

The invention discloses a novel solid base catalyst and application thereof in the preparation of biodiesel oil. The catalyst is prepared by loading potassium fluoride as an active component on carriers; and calcining at a high temperature. The carrier is alumina, activated carbon or diatomite. The biodiesel oil is prepared by transesterification including adding oil and fat, low carbon alcohol and the solid base catalyst into a three-neck container; refluxing under heating and stirring; filtering to remove the catalyst; demixing the filtrate; separating glycerol at the lower layer, adding NaHCO3 solution into the mixture at the upper layer; washing until a neutral condition; drying with anhydrous MgSO4; and reduced pressure distilling. The application of the catalyst in the preparation of biodiesel oil has the advantages of high yield, cheap catalyst, small catalyst consumption, mild reaction conditions, short reaction time, reutilization of catalyst, environment friendliness and low requirement to raw material.

The invention discloses a preparation method and application of a nitrogen and phosphorus codoped carbon oxygen reduction catalyst for a microbial fuel cell. The preparation method comprises the following steps: soaking cellulose by an ammonium phosphate compound brine solution, carrying out suction filtration, drying, and carbonizing under the protection of high-purity nitrogen, thereby obtaining nitrogen and phosphorus codoped carbon which serves as a cathode catalyst of the microbial fuel cell. The preparation method provided by the invention has the advantages that the catalyst is prepared by taking natural cellulose which is recyclable and is wide in source as a carbon source and taking cheap and nontoxic ammonium phosphate compound salt as a nitrogen source and a phosphorus source via a direct carbonization method, and can greatly improve the output power of the cell as the catalyst of the microbial fuel cell; the method is simple in preparation, is low in cost, and provides possibility for the scale production of the microbial fuel cells.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for extracting gold from cyanidation tailings. The method comprises the following steps that the cyanidation tailings, bentonite and calcium chloride are proportionally mixed, pelletized, dried and roasted; metal gold and chlorine form a chemical compound; the chemical compound is volatilized in a form of smoke; the smoke is subjected to spray washing and concentrated by a thickener; ore pulp is subjected to filter pressing; an obtained filter cake is cyanidation leaching; and the gold is extracted. The method is simple in process, low in raw material requirement and high in gold recovery rate; the pellet strength is high; the phenomenon of rotary kiln accretion is avoided; the gold in the cyanidation tailings is recovered with lower production cost; in addition, 'zero waste emission' is realized in a whole production flow; environmental pollution is reduced; and a resource utilization rate is increased.

The invention provides food for a pet dog. The food is characterized in that the food mainly comprises the following raw materials by weight: 30 to 70 portions of edible meat or animal skin and 30 to 70 portions of puffed rice flour. The food which has cheap and easily obtained raw materials and high nutritive value can serve as the snack food for the pet dog for a long period. The invention also provides a preparation method for the food for the pet dog.

The invention relates to the technical field of separation of natural free radical scavengers in Saxifraga tangutica, in particular to a separation process of a natural free radical scavenger in Saxifraga tangutica and application of the natural free radical scavenger. The separation process comprises the following six steps: extraction, coarse separation via a microporous resin column, online free radical scavenger component screening, preparation via a reversed-phase preparative column, reversed-phase preparative liquid chromatographic purification of Fr1-1and hydrophilic/reversed-phase two-dimensional liquid chromatographic purification of Fr1-3. The method is low in cost, and product purity is greater than 95%; a technical means adopted by the invention can realize large-scale production: requirements on raw materials are not high, cost is low, and batch preparation is easy; room-temperature cold leaching extraction with methanol is adopted, so operation is easy; the microporous resin column is adopted for coarse separation, and a microporous resin separation material can be loaded in a medium-pressure column chromatography system, so large-scale production can be easily realized; and reversed-phase preparative liquid chromatography or hydrophilic preparative liquid chromatography used in separation and purification is a rapid isocratic method.

The invention provides a method for manufacturing plates from waste fibers of waste filtering bags, waste textiles and the like. The method comprises the steps of drying, loosening, dedusting, air laying, rolling, multi-stage compressing to form plates, trimming and packaging. An air laying technology is selected, so that fibers are arranged in a fiber net without directivity, and the horizontal and longitudinal ratio of the plates is approximate to 1:1, and the method is suitable for various fibers with different lengths and wide varieties, requires less on raw materials, and is suitable for a wide range of fibers; compared with a scheme that the required thickness of plates is reached by laying for multiple layers in a traditional carding method, the air-laying can obtain the required thickness of plates by directly controlling the output speed.

The invention discloses a method and a system for producing rPET bottle-grade polyester chips. The method comprises the following steps: an esterification step, a pre-polycondensation step, a final polycondensation step and a solid-phase polycondensation step, in the esterification step, raw materials including waste PET polyester bottle fragments, terephthalic acid and ethylene glycol are added into an esterification device, the waste PET polyester bottle fragments are subjected to an alcoholysis reaction, and meanwhile, terephthalic acid and ethylene glycol are subjected to an esterificationreaction. The method is low in investment, simple in technical route, low in raw material requirement and good in product quality; an original polyester bottle chip production device is adopted, thewaste polyester bottle fragments are subjected to alcoholysis by utilizing ethylene glycol which is one of polyester bottle production raw materials, so that the closed circulation of the ethylene glycol is realized, the esterification reaction kettle has a dual-purpose function, and the PET polyester chips meeting the national standard level of raw materials can be produced by utilizing the wastePET polyester bottles.

The invention discloses a method for preparing powdery electrolytic manganese dioxide (EMD). In the method, the powdery EMD is directly obtained from solution by improving the electrolytic process and controlling the electrolytic condition; and during electrolysis, a diaphragm electrolytic cell is adopted, a lead silver alloy plate or a titanium manganese alloy plate subjected to acid treatment is taken as an anode, and a graphite plate or a stainless steel plate is taken as a cathode. The method comprises the following steps of: preparing electrolyte with 0.1 to 10.0mol/L sulfuric acid and 0.4 to 1.2mol/L manganese sulfate, adding an active agent into the electrolyte, electrolyzing at the temperature of between 20 and 100 DEG C under the action of ultrasonic waves, and filtering to obtain the powdery EMD; and washing the powdery EMD for multiple times, adding a dispersing agent into solution when the powdery EMD is washed for the last time, and drying to obtain the powdery EMD. The method has the characteristics that: the process flow is simple, energy consumption and cost are low, product particles are uniform and have good appearance, and the like.

The invention relates to a formula of a hard polyurethane molding foam negative pressure foaming raw material, wherein the raw material is prepared by mixing polyether polyol, a polyester polyol, a foam stabilizer, a catalyst and water, and a weight ratio of the polyether polyol to the polyester polyol to the foam stabilizer to the catalyst to the water is 50-90:10-50:2-3:2-3:1-2.5. The hard polyurethane molding foam negative pressure foaming production method comprises carrying out hard polyurethane foaming under a state with a negative pressure of 0 to -0.025 MPa, wherein polyurethane foaming is performed under the negative pressure state so as to reduce polyurethane raw material requirements. In addition, a high functionality polyester polyol can be adopted as a main polyol to prepare a combination polyether so as to carry out foaming, such that a mold cavity can be filled in a short time, and the prepared foam has characteristics of thin cell, high strength and good size stability.

The invention discloses a multi-degree of freedom human-simulated rigid-flexible mixing hand and a manufacturing technology thereof, and belongs to the technical field of robots. Each soft finger includes metacarpophalangeal joints and interphalangeal joints, wherein a central air flue communicates with a central air cavity. A plurality of metacarpophalangeal joint air cavities surround the central air flues. A layer of fiber limiting threaded pipes are wound around the metacarpophalangeal joint air cavities. The central air flues and the tail ends of the multiple metacarpophalangeal joint aircavities are inserted into a finger base. A ventilating cavity is formed inside the body of a hard palm, and the hard palm fix the soft fingers through screws. Each central air flue, each metacarpophalangeal joint cavity and each central air cavity achieve air inflow through capillary silica gel hoses. The active degree of freedom is multiple, the human hand joint structure is simulated, and thejoint angle and motion relations are close to human hand parameters. Due to the joint type structure, compared with a continuous bent soft claw, the hand has the larger enveloping space, the grabbingperformance is better, the flexibility is good, and the hand has the good adaptability for soft and fragile objects and unstructured environment.

The invention provides a method for reducing iron by smelting reduction in electrometallurgy. The method is characterized by taking electric energy as a heat source and natural ore or artificial ore, carbonaceous reducing agent and solvent as raw materials and comprising the following steps: pre-reducing the raw materials at the temperature of 700 to 900 DEG C for 4 to 6 h; heating to 1,400 to 1,700 DEG C in an electric furnace so as to smelt the furnace burden and reduce into molten iron and slag, and discharging the molten iron and slag to a foundry ladle; meanwhile, dedusting the smoke dust during the smelting, wherein the smoke is returned to a pre-reducing device and used as reducing gas; the smoke dust is used for manual granulation and recycled; the molten iron is cast and formed or directly used for steelmaking; and the slag is processed for other purposes. The method has the advantages of simple process and equipment, little occupation, low requirements on raw materials, wide applicable range, low sulphur load of produced molten iron compared with molten iron of a blast furnace and good product quality, while saving investment and resources without needing equipment for coking, sintering and the like or using coke as fuel.

The invention discloses a boron-free high-performance glass fiber taking pulverized fuel ash and desalted river sand as raw materials, as well as a preparation method thereof, belonging to the technical field of materials. The boron-free high-performance glass fiber is prepared from the following raw materials in percentage by weight: 30-55% of pulverized fuel ash, 0-15% of blast-furnace slag, 40-50% of desalted river sand, 0-12%of magnesium oxide, and 0-6% of calcium oxide. The high-performance glass fiber can be prepared in a common refractory material liner smelting furnace by pretreating the pulverized fuel ash and adding a less amount of blast furnace slag, magnesium oxide and calcium oxide through taking pulverized fuel ash and desalted river sand as raw materials, the strength and elastic modulus are obviously higher than those of the common E glass and ECR, Advantex boron-free glass and the like, the preparation processes are simple, the smelting temperature is at 1400-1420DEG C, a difference between the fiber forming temperature and liquid phase temperature is more than 70DEG C which is far higher than the lowest standard of the glass fiber industrial production being 50DEG C, the production cost is low, and the glass fiber industrial production standard can be met. The component glass has higher chemical corrosion resistance and high-temperature resistance properties compared with the traditional E glass.

The invention discloses a ceramic coating protection gradient carbon-ceramic composite material and a preparation method thereof. The ceramic coating protection gradient carbon-ceramic composite material comprises: a gradient carbon-ceramic composite material which is provided with a concave structure on the surface thereof and is a gradient C/C-ZrC-SiC composite material; and an ultrahigh-temperature ceramic coating which is continuously arranged along the surface of the gradient carbon-ceramic composite material and the inner wall surface of the concave structure. The ultrahigh-temperature ceramic coating is an indissolvable metal carbide coating formed by diffusing and infiltrating indissolvable metal along the surface of the gradient carbon-ceramic composite material and reacting the indissolvable metal with the surface of the gradient carbon-ceramic composite material. Therefore, the formed ceramic coating is a three-dimensional jack structure coating, the interfacial strength of the ceramic coating is far higher than that of a two-dimensional plane coating, the surface area of the coating is greatly increased due to the arrangement of the concave structure, meanwhile, the flow resistance of melt on the surface of the composite material can be improved, then the overall temperature resistance of the composite material can be improved, and the risk of coating stripping is reduced.

The invention relates to a preparation of water soluble lake of carminic acid, including steps of: (1) preparation of cochineal color acid mother liquor; (2) laking; (3) generation of water soluble lake. The water soluble lake of carminic acid can be widely applied to food product, candy, beverage, medicament and cosmetics.