134results about How to "The method flow is short" patented technology

The invention provides a method for recovering lithium from a lithium-containing electrode waste material. The method comprises the following steps of (1) roasting the lithium-containing electrode waste material under a reducing atmosphere, after roasting, cooling under a protective atmosphere to obtain a reduced material, leaching the reduced material through a leaching agent, and carrying out solid-liquid separation to obtain a lithium-containing solution and solid slags; (2) preparing the lithium-containing solution in the step (1) into a lithium-containing product. According to the methodprovided by the invention, a reducing gas is adopted for reducing roasting, so that the roasting temperature is low, and the energy consumption is less; and one-step leaching is carried out after reducing, so that high-efficient separation of lithium and other metal elements can be realized, the concentration of the lithium in the leaching agent is high, the recovery rate of the lithium is greatlyimproved, the recovered lithium-containing product has high purity, and in addition, other transition metal elements in the waste electrodes can be further recovered. The method provided by the invention is short in flow, low in cost, and easy to realize industrial application.

The preparation process of fraction oil hydrogenation treatment catalyst includes assistant adding modification of gamma-alumina precursor and subsequent conventional preparation process. The fraction oil hydrogenation treatment catalyst includes gamma-alumina precursoe prepared through carbonation process, aluminum nitrate process, aluminum sulfate process or aluminum chloride process; F an/or Bas assistant and W and Ni as active component. Compared with available technology, the present invention has the advantages of simple preparation process, low cost, low power consumption, and excellent catalyst performance. The catalyst of the present invention is suitable for hydrogenation treatment of 130-390 deg.c fraction oil.

The invention provides a method for selectively recycling positive electrode materials for lithium ion batteries. The method comprises the following steps: carrying out transformation processing aftermixing the recycling positive electrode materials for lithium ion batteries with an additive; leaching an obtained transformation product with a leaching agent, and carrying out solid-liquid separation to obtain a lithium-rich solution and a solid slag; and preparing the obtained lithium-rich solution into a lithium salt and the obtained solid slag into a transition metal salt. According to the method, recycling of valuable metals in the positive electrode materials for lithium ion batteries is realized by using in situ crystal transformation and mild leaching methods, particularly, selectiveextraction for lithium is realized, the recycle rate reaches 95% or above, and the recycle rate of other valuable metals such as nickel, cobalt and manganese reaches 98% or above; the method is shortin flow, other impurity ions are not introduced, the product purity is high, secondary pollution and liquid waste disposal can also be avoided, the recycle cost is saved, and the method is easy to realize industrial application.

The invention discloses a method for recovering organic effluent brine. The method comprises the following steps: introducing organic effluent brine containing inorganic salts and organic matter into a prefiltration system, an evaporation crystallization system and a dry-method high temperature oxidation reaction system, after filtration, evaporation, and oxidation treatment, allowing the obtained inorganic salt product to be dissolved to become saturated brine, wherein the total organic carbon TOC is less than 10 ppm. With the method of the invention, more than 90% of water and inorganic salts can be recovered, and the zero discharge standard for waste water is basically reached; the recovery rate for the recycling of organic effluent brine is effectively increased; and great benefits are generated for environment protection and resource recovery; additionally, the obtained inorganic salt product can be used as an industrial raw material for recycling in ionic membrane electrolytic devices.

The invention discloses a PTFE (polytetrafluoroethylene) fiber for denitration. The fiber is prepared from PTFE dispersion resin, aviation kerosene and manganese catalyst powder. The invention further provides a preparation method of the PTFE fiber for denitration. The method comprises the steps of raw material inspection, storage and refrigeration, ingredient mixing, standing and curing, prepressing forming, pushing forming, heat preservation in a water tank, rolling for film forming and filamentation of short fibers. The PTFE fiber and the preparation method have the advantages that a functional filter material for dedusting and denitration can be directly prepared from the PTFE fiber; the preparation method of the PTFE fiber is short in process, a denitration catalyst is evenly dispersed in the fiber, and the denitration function is stable and efficient.

The invention provides a method for rapid extraction of bamboo fiber from bamboo, and the bamboo fiber fully meets textile requirements. The preparation method for bamboo fiber belongs to the textile field. The preparation method for bamboo fiber comprises the steps of: bamboo sheet preparation, bamboo sheet cooking, crushing decomposition, bamboo filament cooking, bio-enzyme degumming, and after-treatment. The preparation method for bamboo fiber provided by the invention has the advantages of simplicity, short process, no pollution, environmental protection, low energy consumption, and obvious economic benefits.

The invention provides a method for extracting lithium in a waste lithium ion phosphate anode material. The method comprises the following steps: (1) mixing the waste lithium ion phosphate anode material with an extracting agent solution to obtain mixed slurry; (2) extracting the mixed slurry in the step (1) under the microwave condition and performing solid-liquid separation after extracting to obtain solid containing lithium leachate and FePO4. According to the method disclosed by the invention, the lithium in the waste extracting agent anode material is extracted out through microwave assistance, so that an energy utilization rate and a heating efficiency are high; by means of the method, a lithium extracting rate can reach 95% or more, selectivity and a recovery rate of lithium can respectively reach 98% and 95% or more, and iron is precipitated in a FePO4 mode; the method has the advantages of short process flow, simpleness in operation and easiness in industrial production.

The invention provides a lithium iron phosphate with high compact density and a preparation method thereof. The lithium iron phosphate positive electrode material comprise large particles of lithium iron phosphate and small particle of lithium iron phosphate, wherein that small particles of lithium iron phosphate are filled in the voids between the large particle of lithium iron phosphate, and theshape of the small particles of lithium iron phosphate comprises a spherical shape. A method for prepare that lithium iron phosphate precursor comprises sinter the lithium iron phosphate precursor ina protective gas atmosphere, wherein the sintering is three-stage sintering, the sintering temperature of the three-stage sintering is sequentially increased, and aft the three-stage sintering is finished, the lithium iron phosphate positive electrode material is obtained; Wherein the shape of the lithium iron phosphate precursor comprises a spherical shape. The compaction density of the lithiumiron phosphate with high compaction density provided by the invention can reach 2.7 g/cm3, the electrochemical performance is excellent, the first discharge specific capacity of 1C can reach 150 mAh/g, and the capacity retention rate of 50 cycles of 1C can reach 99.9%.

The invention relates to a method for preparing a babbitt alloy from residue containing silver of copper anode slime. The method comprises the following steps:1, adding sodium carbonate, powdered carbon and borax according to the mass of the residue containing silver, and uniformly mixing; 2, melting to obtain a crude alloy containing lead; 3, preparing an electrolyte from fluosilicic acid, lead fluorosilicate, stannous oxide and potassium antimonyl tartrate, and adding with gelatin and ethyl naphthol; 4, treating the crude alloy as an anode and a stainless steel plate as a cathode, and taking the cathode plate (the stainless steel plate) and peeling cathode products each 12h; and 5, adding lead, antimony and copper or tin, antimony and copper to the cathode products, and melting to obtain the lead-based or tin-based babbitt alloy. The method which has the advantages of short flow, low cost, and strong practicality and allows the lead-based or tin-based babbitt alloy to be prepared from the residue containing silver of the copper anode slime is especially suitable for anode slime processing in electrolyzing electronic wastes with regenerated copper, and has the characteristics of simple and feasible operation, and high recovery rate of valuable metals.

The invention discloses a comprehensive recovery method for tungsten accompanying fluorite resources. The method comprises the steps that tungsten accompanying fluorite ore is broken and ground and then is subjected to magnetic separation deferrization and flotation desulfuration; the desulfured tailings are subjected to flotation separation I through a combined inhibitor composed of sodium silicate, bake glue and gallotannic acid and a collecting agent fatty acid to obtain tungsten and fluorite bulk concentrate; the bulk concentrate is subjected to flotation separation II through an inhibitor amino phosphonate after being subjected to acid decalcification treatment, the foam product is fluorite concentrate, and the tailings product is tungsten concentrate. By means of the method, the comprehensive recovery rate of tungsten and fluorite resources is greatly improved, the flow is short, the medicament is simple, operation is convenient, the labor intensity is low, energy consumption is low, environmental protection and high efficiency are achieved, and the ore dressing cost is greatly reduced.

The invention provides a method for removing tungsten, vanadium, phosphorus and arsenic from a molybdenate solution by deposition. The method comprises that: a reagent is added into the molybdenate solution to generate a precipitator in the solution, and by the precipitator, the impurities of tungsten, vanadium, phosphorus and arsenic in the solution are removed. The method has the advantages of removing various impurities at the same time and having high impurity removing degree, along with little loss of molybdenum, short flow, simple equipment, easy implementation, low cost and no environmental pollution.

The invention provides a novel method for preparing Bisphenol type flame-retardant polycarbonate characterized by that, tri-phosgene is employed to substitute phosgene for reacting with bis-phenol raw material to obtain flame-proof polycarbonate. The method can realize greatly improved production safety.

The invention discloses a method for recovering rhenium from high-sulfur high-arsenic unwieldiness lean rhenium slag, and belongs to the technical field of dissipated metal recovering. According to the method, the high-sulfur high-arsenic unwieldiness lean rhenium slag is subject to oxidizing roasting arsenic expelling and desulfuration, and therefore the rhenium in the high-sulfur high-arsenic unwieldiness lean rhenium slag is preliminarily enriched, and rich-rhenium slag is obtained; and then the rich-rhenium slag is subject to ordinary-pressure selective leaching, leaching slag serves as bismuth dross to be treated, leaching liquid is subject to extraction, separation and purification, and rich-rhenium liquid obtained after purification is subject to evaporation concentration and freezing crystallization to produce an ammonium rhenate product. The method is short in procedure, simple in process, high in rhenium recovering rate and low in running cost; the problems that when a traditional wet method leaching process is adopted for treating high-sulfur high-arsenic lean rhenium slag, the rhenium leaching efficiency is low, produced copper arsenic slag is large in treatment difficulty, and leaching liquid is difficult to filter are solved; valuable metal copper and bismuth are recovered while the rhenium is recovered, and the resource comprehensive utilization level is improved.

The invention discloses a super-mirror polishing method of a metal plate. The method comprises the following steps: (1) the metal plate is grinded by a grinding tool, or is coldly rolled by a finishing mill to obtain a straight board shape, wherein the reduction rate of the cold rolling is 3-30%; (2) a water abrasive paper is bonded on a turntable of a metallographic polisher for polishing the metal plate processed in the step (1); and (3) the surface of the metal plate polished in the step (2) is polished by a polisher with a sponge disc under the speed of 1500-2500 r/min until the roughness Ra is smaller than 10 nm; and grinding paste with the particle size of W0.5-W5.0 is coated on the sponge disc. The method has the advantages of short flow, high efficiency, flexible operation and wide application range.

The invention provides a method for recovering lithium in lithium-containing battery waste materials. The method comprises the following steps of (1) mixing the lithium-containing battery waste materials with a salt water solution to obtain raw material slurry; performing electrochemical treatment on the raw material slurry; performing solid-liquid separation; obtaining liquid of lithium-containing purified liquid; (2) regulating the pH of the lithium-containing purified liquid in the step (1) to be 7 or higher; adding carbonates for lithium precipitation reaction; performing solid-liquid separation after the reaction; obtaining solid of lithium carbonate. The method provided by the invention has the advantages that the flow process is short; the operation is simple; the reaction process is green and clean; no waste is discharged in the integral flow process; the soaking- precipitation-separation process of a conventional process is realized through one step of the electrochemical processing; the production cost is reduced; the lithium recovery selectivity is as high as 99 percent; the single time recovery rate reaches 95 percent or higher; the obtained product purity reaches the battery grade lithium carbonate requirements; meanwhile, the high-value conversion of other metal ingredients is realized.

The invention discloses a method for recovering lead in lead plaster of waste lead-acid storage batteries. The method includes leaching lead oxide and lead sulfate in the lead plaster by heating mixed solution of sodium hydroxide and tartaric acid, directly leaching lead dioxide, and then electrolyzing through heating. The processes of desulfuration and reduction transformation are omitted, and the procedure of the method is short. Purity of cathode lead is higher than 99.5%, and recovery rate of combined lead in the lead plaster is higher than 98.5%. A cathode used is in the shape of a plate and easy to clean and can be used for ingot casting directly due to the fact that the cathode adsorbs little electrolyte.

The invention discloses a comprehensive recycling method for positive and negative electrodes of scrapped lithium batteries. The method concretely comprises the following steps: separating aluminum and copper from the batteries through pretreatment, drying the remaining material, adding a phase reconstructing agent, uniformly mixing the remaining material with the phase reconstructing agent, performing low-temperature catalytic calcinations, cooling and crushing the calcined material, performing an impregnating reaction in a neutral salt system, carrying out solid-liquid separation, allowing soluble lithium to enter a liquid phase, removing impurities, carrying out concentrative crystallization, drying and crushing obtained crystals to obtain battery grade lithium carbonate, introducing carbon dioxide to the above obtained crystallization mother liquid, and performing drying and crushing to obtain the battery grade lithium carbonate; and allowing insoluble nickel, cobalt, manganese andcarbon to enter a solid phase, washing the obtained solid phase, adding an ore dressing agent in a carbonate radical-containing environment, carrying out flotation to separate carbon from nickel-cobalt-manganese, performing washing, activation, drying and sorting on the separated carbon to obtain a negative electrode material, and directly washing the separated nickel-cobalt-manganese with pure water to directly become a nickel-cobalt-manganese polynary precursor material raw material. The method has the advantages of short process, moderate energy consumption, high comprehensive yield of valuable elements of the positive and negative electrodes, good product quality, environmental friendliness, low cost, and suitableness for industrialization.

The invention relates to a method for purifying pentachlorophenol (PCP) in water through photocatalysis, which comprises the following processes of: mixing and stirring a bismuth silicate photocatalyst and pentachlorophenol sewage to be treated, performing ultrasonic dispersion, adsorbing and balancing, irradiating by using a xenon lamp and the like; and pentachlorophenol photocatalytic degradation reaction results prove that the pentachlorophenol in the water can be efficiently purified through the method. The invention can overcome the defects of high energy consumption, complex operation, violent reaction conditions, poor purification capacity and the like in the conventional purification method, provides a method having the advantages of short flow, simple equipment and good efficiency of purifying the pentachlorophenol, and has wide industrial application prospect.

The invention provides a method of recovering lead from scrap lead-acid storage battery lead plaster, and belongs to the technical field of wet-process metallurgy. The method is characterized in that a reducing agent (FeCl2 or hydrogen peroxide) and lead plaster are added to an aluminum chloride solution, leaching is carried out in an agitating mill to allow lead in the lead plaster to enter the solution, lead in an extract is replaced by metallic aluminum, and after the lead is replaced, the original extract returns and lead slag is leached continuously. The method has the characteristics of short flow, few processes, low energy consumption and cost, and the like, and meets the environmental requirements of cleaning production.

The invention discloses a method for extracting electrodeposited zinc from a zinc oxide powder in an ammonium chloride solution system. The method comprises the following steps: A, dissolving an ammonium chloride solid in water, at the same time, introducing NH3 and continuously stirring, and allowing the concentration of NH3 of the prepared before-leaching solution to reach 20-70 g/L; B, taking a certain amount of the prepared before-leaching solution, adding the zinc oxide powder according to the liquid-to-solid ratio of 2-10:1, at the same time, introducing NH3 and continuously stirring, and carrying out leaching treatment; C, adding a zinc powder into a filtered liquid after leaching, and carrying out purification treatment to obtain a solution after purification; and D, carrying out electrodeposition treatment of the solution after purification by connecting direct current, wherein an anode adopts graphite and a cathode adopts an aluminum plate. The method is short in flow and has no need of pretreatment of fluorine and chlorine in zinc oxide, the craft process also has no need of a specialized fluorine chlorine removing procedure, process waste water is not produced, and no waste residue is required to be piled up. Therefore, the environmental protection problem is solved, and a development mode of circular economy is also met.

The invention relates to the field of beneficiation, in particular to a cellophane beneficiating method. The method comprises the following steps of: autogenously grinding raw cellophane; performing ball milling to obtain ore powder; and performing flotation on the ore powder by using a flotation column to obtain concentrate. The raw cellophane is autogenously ground into broken ore with the fineness of 45 to 50 percent, the broken ore is ball-milled into the ore powder with the fineness of 75 to 85 percent, the concentrate of which the MgO content is 0.8 to 0.9 mass percent is obtained by the flotation, the concentrate of which the recovery rate is 91.5 to 92.5 percent is obtained by the flotation through the flotation column, the concentrate obtained by the flotation is concentrated into concentrate pulp of which the water content is less than 40 percent, the concentrate pulp is filtered to obtain filter cakes of which the water content is less than 15 percent, and the obtained filter cakes are dried into concentrate powder of which the water content is less than 5 percent. By the cellophane beneficiating method, the beneficiating flow can be simplified.