42results about How to "The process path is simple" patented technology

The invention discloses a method for separating enriched nickel and cobalt from a laterite nickel ore lixivium, which comprises the following steps: after solid and liquid separation between the laterite nickel ore lixivium and ore slag is implemented, a vulcanizing agent is added into the lixivium, the solid and the liquid are separated after reaction precipitation, and precipitated solid is washed by a new lixivium, thus obtaining sulfide precipitate; after the sulfide precipitate is pulpified, sulphuric acid and solution of nitric acid and mixed acid are added so as to implement oxidizing leaching; the goethite method is adopted for removing iron from a superior pickle liquor; a sodium thiosulfate solution is added so as to implement copper removing; a filtering liquor that is the enriched nickel and cobalt solution is obtained. Compared with the prior art, the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium is implemented at normal temperature and normal pressure, does not need a high-pressure caldron, has less device investment, low running cost, simple technical path, short process and controllable production scale; the vulcanizing agent and acids that are used in the technique can be recycled to the utmost extent and do not have emissions and environment pollution; the extraction yield of nickel and cobalt can achieve over 95 percent, and the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium has low production cost and easy industrialization.

A process for extracting Ni and Co from the low-grade Ni-contained laterite ore includes such steps as crushing to make its average granularity less than 2 cm, stacking the ore particles with granularity of 100 mesh-1.5 cm, proportionally mixing others, adding them to the stack, shrinkling acidic extracting liquid, collecting the extracting liquid, and concentrating until the concentration of Ni ions is 2-4g/L.

The invention discloses a method for separating enriched nickel and cobalt from battery waste leaching solution. The method comprises the following steps of: (1) soaking battery waste with acidic leaching solution, adding a reducing agent for treatment, adjusting pH value by using sodium carbonate and then heating and adding hydrogen peroxide or sodium hypochlorite to stir for ruction so as to obtain FeOOH precipitate; then adding a vulcanizing agent for vulcanization treatment; and finally adding water to prepare slurry, adding mixed acid solution for treatment and performing solid-liquid separation to obtain nickel and cobalt-enriched solution. The method for separating the enriched nickel and cobalt from the battery waste leaching solution provided by the invention has the advantages of less investment, simple process, low energy consumption, low production cost, high nickel and cobalt recovery rate and low impurity content in obtained nickel and cobalt-enriched solution.

The invention discloses a light-emitting diode package structure manufacturing method, which comprises the following steps of: sequentially growing an n-type layer, an active layer and a p-type layer on an insulating substrate by utilizing a metal organic vapor phase epitaxial method; downwards photoetching one side of the upper surface of the p-type layer with the photoetching depth of reaching the surface of the n-type layer to form a first tabletop, downwards etching the other side with the etching depth of reaching the surface of the insulating substrate to form a second tabletop; manufacturing conductive through holes on the first and second tabletops, and filling conductive metals; manufacturing an insulating layer partially covering the upper surface of the p-type layer on the sideclose to the second tabletop; manufacturing a p electrode covering the insulating layer on the insulating layer; manufacturing an n electrode on the conductive through hole on the first tabletop; thinning the insulating substrate; manufacturing a first back electrode and a second back electrode on the two sides of the back of the insulating substrate to form a substrate of a device; packaging an optical element on the substrate of the device to finish manufacturing the device on the substrate; and cutting the device on the substrate into independent devices in a mechanical way.

The invention relates to a light emitting diode (LED) packaging structure. The LED packaging structure comprises an insulating substrate, an n-shaped layer, an active layer, a p-shaped layer; an isolating layer, a p electrode, an n electrode, a first back electrode and a second back electrode, wherein through holes are formed on both sides of the insulating substrate and are filled with conductive metal; the n-shaped layer is arranged on the insulating substrate, and a hole is formed in the n-shaped layer and is filled with conductive metal; the active layer is arranged on the n-shaped layer;the p-shaped layer is arranged on the active layer; the isolating layer is positioned on one side of the n-shaped layer, the active layer and the p-shaped layer and is used for covering a part of upper surface of the p-shaped layer; the p electrode is used for covering the isolating layer and covering a part of upper surface of the p-shaped layer; the n electrode is arranged on one side of the upper side of the n-shaped layer and is connected with the conductive metal in the through holes in the insulating substrate; the first back electrode is arranged on one side of the rear side of the insulating substrate and is connected with the p electrode through the conductive metal in the through holes in the insulating substrate; and the second back electrode is arranged on the other side of the rear side of the insulating substrate and is connected with the n electrode through the conductive metal in the through holes in the insulating substrate. A substrate of a device is formed by all the parts, and an optical element is packaged on the substrate to complete the production of the device.

The invention discloses a method for precipitating iron from goethite containing a ferro-nickel mixed solution. The method comprises the following steps: slowly adding a mixed solution containing nickel sulfate and ferric sulfate into a solution of which the Fe<3+> content is less than or equal to 1g/L, and stirring while controlling the reaction temperature to be 20-80 DEG C and the PH to be 2.5-4.0, so that goethite precipitate is generated through Fe<3+>. The chemical precipitation is good in filtering performance and easy to wash, and complete ferro-nickel separation can be realized. The precipitated goethite is high in iron content and can serve as coarse iron ore for sales. The process is variable in production scale, wide in application, simple in process route, low in investment, low in energy consumption, good in nickel-iron separation effect, simple and convenient to operate and low in production cost, the environment is not polluted, nickel-iron separation is realized in the process of precipitating iron from the nickel sulfate and ferric sulfate mixed solution, and an extremely effective and economic and applicable way is provided for iron recycling.

The invention discloses a preparation method for a polycrystal/monocrystal-like solar cell selective emitting electrode structure. The preparation method for the polycrystal/monocrystal-like solar cell selective emitting electrode structure comprises the following steps: (1) chemically removing a surface energy affected layer; (2) carrying out heavy doping by the one-time diffusion technology to form a PN junction; (3) growing or forming a dielectric layer or a mask layer on the surface of a silicon wafer; (4) corroding the dielectric layer of a non-electrode grid line area with a chemical corrosion method, and keeping the mask layer under an electrode grid line area; (5) etching a pyramid matte structure of 100-300nm in the non-electrode grid line area by reactive ion etching (RIE), and meanwhile, forming a shallow doped area in one time; and (6) removing a surface affected layer formed by RIE and a lower mask layer under the electrode grid line area with a wet chemistry method to obtain the selective emitting electrode structure. According to the preparation method for the polycrystal/monocrystal-like solar cell selective emitting electrode structure, which is disclosed by the invention, the light doping and the heavy doping required by the selective emitting electrode polycrystal/monocrystal-like solar cell and a low-reflectivity nanoscale surface texture can be finished by one-time diffusion combined with the RIE technology, the process path is simplified, the conversion efficiency is high, and the preparation method for the polycrystal/monocrystal-like solar cell selective emitting electrode structure is suitable for industrial volume production.

The invention discloses a method for producing electrolytic nickel by leaching chemically precipitated nickel sulfide with pure oxygen, comprising the following steps: mixing and pulpifying chemically precipitated nickel sulfide and high pressure leachate based on the mass ratio of (8-10):1, performing one-stage atmospheric pressure leaching on the pulpified material, removing impurities from one-stage leachate and electrolyzing, producing electrolytic nickel and anolyte, mixing one-stage leached residue with anolyte for secondary pulpifying, further leaching by two-stage high pressure, and returning the obtained leached filtrate to one-stage pulpifying for utilization. The process technique has widely utilized resources, simple technical route, small investment, low energy consumption, no environment pollution, high leaching rate of nickel and cobalt, simple and convenient operation and low production cost, and provides an effective and economical way for producing electrolytic nickel in nickel sulfide concentrates.

The invention relates to the technical field of dehydrogenase mutants, in particular to a novosphingobium short-chain alcohol dehydrogenase mutant and an application thereof. The novosphingobium short-chain alcohol dehydrogenase mutant adopts the amino acid sequence of novosphingobium short-chain alcohol dehydrogenase NA-ADH as a template. The short-chain alcohol dehydrogenase mutant of a marine origin is obtained by site-directed mutagenesis. The mutuant is transferred into an expression strain BL21 (DE3) to obtain thalli containing the recombinant short-chain alcohol dehydrogenase after recombination by an expression vector, and then beta-hydroxytetradecanoate is used as a substrate to prepare (R)-beta-hydroxytetradecanoate by bio-enzyme catalysis, the chiral ee value of the obtained (R)-beta-hydroxytetradecanoate can reach above 99, and the substrate conversion rate is above 95%. The preparation conditions are mild, and the process way is simple.

The invention discloses a method for producing magnesium hydroxide from a mixed solution containing magnesium chloride and calcium chloride by a lime seeding method. The method is capable of producing high-purity magnesium hydroxide through the steps of adding the magnesium hydroxide to the mixed solution containing magnesium chloride and calcium chloride, stirring and then slowly adding lime milk, wherein the produced high-purity magnesium hydroxide is good in filtration performance, easy to wash and capable of completely separating calcium from magnesium. The calcium chloride solution left after the magnesium hydroxide precipitates can be used for producing crystalline calcium chloride through evaporative crystallization. The method is changeable in production scale, wide in application, simple in process route, low in investment, low in energy consumption, free of pollution to environment, good in calcium-magnesium separation effect, simple and convenient to operate and low in production cost; and therefore, a quite effective, economical and practicable way is provided for producing the magnesium hydroxide from the mixed solution of magnesium chloride and calcium chloride.

The invention discloses a method for recycling valuable metal from electronic waste. The method comprises the following steps that 1, the electronic waste is immersed into sulfuric acid to obtain a mixture A; 2, ozone is introduced to react with the mixture A after the mixture A is heated to 40-60 DEG C, and a mixture B is obtained after the reaction is completed, wherein the amount of the introduced ozone corresponding to every one kg of electronic waste is not less than 2 L/h, and the reaction time is not less than 2 h; and 3, the mixture B is subjected to solid-liquid separation, and obtained liquid is copper sulfate solution. According to the method, the electronic waste does not need to be smashed before being subjected to acid immersion; the method is implemented at low temperature and normal pressure, investment is less relatively, and the operating cost is low; the process is simple, energy consumption is low, the production cost is low, the recovery rate of the valuable metal is high, and the method is applicable to large-scale industrial production; the ozone used for the method cannot pollute the environment, no pollutants such as sulfur dioxide can be produced in the leaching process, and good economic benefits and environmental benefits are realized.

The invention discloses a process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation. According to the process, a waste liquid obtained by subjecting laterite nickel ore to leaching with hydrochloric acid, iron removal with calcium carbonate and nickel precipitation with lime, which contains calcium chloride and magnesium chloride, and a waste liquid obtained by subjecting the laterite nickel ore to leaching with sulfuric acid, iron removal with calcium carbonate and nickel precipitation with sodium hydroxide are mixed according to a molar ratio that is Ca<2+>:SO4<2->=1:1 to produce calcium sulphate dihydrate, and to produce a magnesium chloride hexahydrate type snow melting agent by evaporative crystallization, wherein the second waste liquid contains sodium sulfate and magnesium sulfate. The process can either be big or small in production scale, and is simple in process route, low in investment, low in energy consumption, free of pollution to the environment, simple in operation, and low in production cost. The process provides an effective and economical route for treating the waste liquid containing the calcium chloride and the magnesium chloride, treating the waste liquid containing the sodium sulfate and the magnesium sulfate, reducing pollution and achieving comprehensive utilization.

The invention discloses a method for extracting and separating lithium and alkaline earth metal from salt lake brine with a high sodium-lithium ratio, which comprises the following steps of providing an extraction water phase: taking the salt lake brine with the high sodium-lithium ratio as the extraction water phase which contains Li<+>, Na<+>, Ca<2+> and Mg<2+>, wherein the mass ratio of Na<+> to Li<+> is (10: 1)-(200: 1), providing anextraction organic phase: mixing an extraction agent, a synergistic extraction agent and kerosene, and preparing the extraction organic phase, wherein the extraction agent is a diketone compound, and the synergistic extraction agent is a halogen-containing organic phosphine compound, in an extraction step, mixing the extraction organic phase and the extraction water phase, performing counter-current extraction of more than one stage, and performing phase splitting after the extraction is balanced to obtain raffinate and a first loaded organic phase, and sequentially conducting sodium reverse extraction, lithium reverse extraction, calcium reverse extraction and magnesium reverse extraction on the first loaded organic phase, so that a sodium salt solution, a lithium salt solution, a calcium salt solution and a magnesium salt solution are obtained through separation. Sodium, lithium, calcium, magnesium and other alkaline earth metals are effectively separated from the salt lake brine with the high sodium-lithium ratio.