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422results about How to "Improve leaching rate" patented technology

Method for pollution-free production of sodium chromate by pressure leaching of chromite

The invention belongs to the field of chromite hydrometallurgy and chromium chemical industry, and in particular relates to a method for the pollution-free production of sodium chromate by pressure leaching of chromite. The method comprises the following steps of: 1) reacting the chromite with oxidizing gas in solution of NaOH; 2) diluting the product obtained by the step 1) and making subcrystalline sodium chromate to fully enter a liquid phase; 3) performing solid-liquid separation on the solid-liquid mixed slurry obtained by the step 2); 4) adding calcium oxide into the obtained diluent for removing impurities; and 5) evaporating and crystallizing the obtained solution without the impurities to obtain a sodium chromate crystal and crystallization mother solution; after the solid-liquid separation, rinsing the sodium chromate crystal by using saturated solution of sodium chromate; and drying to obtain a qualified sodium chromate product. The method has the advantages of simple reaction system component, no difficultly separated phase introduced in the system, contribution to high-efficiency separation of the sodium chromate, great reduction in reaction temperature, low energy consumption, effective reduction in production cost of the sodium chromate, and high chromium leaching yield.
Owner:HUBEI ZHENHUA CHEMICAL CO LTD

Method for pretreating refractory gold ore by employing microwave calcining

InactiveCN101225467AImprove leaching rateTo achieve the goal of green environmental protectionProcess efficiency improvementNitrogen gasMicrowave irradiation
The invention relates to a method to pre-treat a hard-to-leach gold ores-pyrite by microwave roasting, which is characterized in that the gold ores-pyrite or fine gold ores-pyrite with the granularity being 200 meshes which takes 90% to 95% of the whole gold ores-pyrite is positioned in a reaction chamber of a microwave roasting oven, a nitrogen is filled fully into the reaction chamber, starting the microwave roasting oven, the gold ores-pyrite or fine gold ores-pyrite is radiated and roasted by the microwave in the nitrogen atmosphere, the roasting temperature is 450 to 580 degree centigrade, the power is 4 to 6kw, the microwave roasting oven stops working after roasting for 5 to 20 minutes, a roasted product is made when the roasting gold ore-pyrite is taken out. The method to pre-treat a hard-to-leach gold ores-pyrite by microwave roasting has the advantages of increasing the gold leaching yield of the hard-to-leach gold ores-pyrite up to over 90%, reaching purpose of the environment protection because the sulfur is precipitated as a free sulfur without the recovery process of smoke and dust, and saving the energy because the microwave roasting process is adopted and the pretreatment time is greatly shortened.
Owner:SHENYANG LIGONG UNIV

Method for microbiological leaching of uranium-molybdenum ore and enrichment and separation of uranium and molybdenum

The invention discloses a method for microbiological leaching of uranium-molybdenum ore and enrichment and separation of uranium and molybdenum. The method comprises a microbiological leaching method of uranium-molybdenum ore and an enrichment and separation method of uranium and molybdenum in a leachate; in the leaching method, an oxidizing agent for leaching the uranium-molybdenum ore is biological high iron, namely an acidophilous acidithiobacillus ferrooxidans solution containing the biological high iron. The method comprises the following specific steps: firstly crushing the uranium-molybdenum ore so that the crushed materials with the granularity of above 200 meshes account for more than 50% of the total amount and the crushed materials with the granularity of 30 meshes account for not more than 10% of the total amount; then infiltrating the crushed uranium-molybdenum ore in a biological oxidizing agent solution, carrying out solid-liquid separation after infiltrating, and then carrying out ion exchange on the microbiological leachate of the uranium-molybdenum ore by using 201*7 resins, and carrying out iron elution, uranium elution and molybdenum elution. In the method, the uranium leaching rate is above 80%, the molybdenum leaching rate is within the range from 60% to 70% or above, and the molybdenum leaching rate is increased by 20-30%; the uranium, molybdenum and iron in the leachate are eluted by using a PH1.0 solution by virtue of an ion exchange column, and the removal rate of the iron is above 95%, the adsorption rate of the uranium and the molybdenum is not affected, the uranium and the molybdenum adsorbed on the resin are desorbed by using different desorption reagents step by step, and the recovery rate of the uranium and the molybdenum is above 80%.
Owner:EAST CHINA UNIV OF TECH

Method for extracting niobium from tailings

The invention relates to a method for extracting niobium from tailings, belonging to the technical field of mineral extraction metallurgy. The method includes the steps as follows: (1) treating the tailings with a flotation method so as to float out iron and niobium minerals from the tailings; (2) using a microwave magnetizing-roasting method and adding carbonaceous reducing agent in the floated minerals so as to convert the haematite in the minerals into magnetite; (3) separating the magnetite out from the roasted minerals by adopting a low-intensity magnetic separation method, thus enriching the niobium minerals in the tailings subjected to magnetic separation; and (4) leaching the obtained niobium minerals out in a high-pressure kettle with concentrated acid so as to obtain niobium-containing extract. The method flow is short, flotation agent types are few and the flotation effect is good; the mineral roasting time is short, the consumption quantity of reducing agent is less and the cost is low; the content of hazardous elements such as S, P and the like in the magnetite obtained by low-intensity magnetic separation is low simultaneously when niobium is enriched, niobium is an excellent material for making iron with a blast furnace, and environment pollution caused by the tailings is solved to a large extent.
Owner:INNER MONGOLIA UNIV OF SCI & TECH

Method for extracting vanadium from vanadium-containing waste catalyst reductive organic acid

ActiveCN105986123AImprove leaching rateLow leaching temperatureProcess efficiency improvementSlagOxygen
The invention relates to the field of non-ferrous metallurgy and resource recycling, in particular to a novel process for extracting vanadium from vanadium-containing waste catalyst reductive organic acid. The novel process comprise the steps that a vanadium-containing waste catalyst is directly extracted in a reductive organic acid system, and other reductive agents are not added, so that pentavalent or tetravalent vanadium is directly reduced into vanadium-oxygen-based ions or trivalent vanadium ions, the vanadium-oxygen-based ions or the trivalent vanadium ions are combined with organic acid radical anions and enter a solution, and vanadium-containing leaching liquid and vanadium-containing leaching slag are obtained; and ammonia water is added into the vanadium-containing leaching liquid to adjust pH so that ammonium vanadate can be formed and precipitated, and after separating is conducted, a vanadium pentoxide product is obtained by calcining precipitation slag. According to the novel process for extracting the vanadium from the vanadium-containing waste catalyst reductive organic acid, the vanadium is extracted by adopting the reductive organic acid system; the extracting condition is mild; the vanadium extracting rate is 95% or above and higher than the direct inorganic acid fluid extracting rate; and other impurity ions are not introduced in the extracting process, so that recycling of other metal elements in the waste catalyst is not affected.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for decomposing scheelite

The invention provides a method for decomposing scheelite. The method comprises the following steps: carrying out complexing decomposition by adopting hydrochloric acid with a certain concentration and phosphoric acid with a certain ratio; after decomposing, enabling tungsten to directly enter a decomposed solution in a manner of heteropoly acid; filtering to obtain a filtrate; extracting tungstophosphoric heteropoly acid in the filtrate by using N235; extracting and separating; carrying out stripping on a loading organic phase by using NaOH; adding calcium sulfate into raffinate; filtering to obtain the hydrochloric acid for circular utilization; circularly utilizing a stripping organic phase; acidifying a stripping solution to adjust the pH (Potential of Hydrogen); evaporating and crystallizing to obtain a sodium phosphotungstate crystal. The method for decomposing the scheelite has the advantages that a traditional scheelite single acid decomposition concept is changed, and the hydrochloric acid and the phosphoric acid are used for carrying out the complexing decomposition on the scheelite to improve the leaching efficiency of the tungsten; the scheelite decomposed solution is treated by an extraction method to improve the concentration of the tungsten and reduce the water use amount of a tungsten smelting process; the water circulation of the whole process is easy to realize; the regeneration of a decomposition reagent is realized by using the calcium sulfate and the production cost is greatly reduced; prepared heteropolyphosphotungstate has a very wide application.
Owner:JIANGXI UNIV OF SCI & TECH +1

Method for preparing hawthorn fruit vinegar beverage by continuously fermenting various mixed strains

The invention discloses a method for preparing hawthorn fruit vinegar beverage by continuously fermenting various mixed strains. The method comprises the following steps: (1) preparing materials; (2) carrying out vacuum leach and enzymolysis; (3) carrying out alcoholic fermentation: inoculating saccharomycetes into leaching solution and fermenting for 10 days at temperature of 25-32 DEG C; (4) carrying out lactobacillus fermentation: inoculating lactobacilli into fermented liquid after the alcoholic fermentation and ending the lactobacillus fermentation at the temperature of 37-40 DEG C when the alcoholic strength is 6-8%; (5) carrying out acetic fermentation: inoculating bacillus aceticus AS1.41 and fermenting for 72-84 hours at the fermentation temperature of 30 DEG C; and (6) sequentially cleaning, blending, homogenizing and sterilizing to acquire the hawthorn fruit vinegar beverage. The hawthorn fruit vinegar beverage prepared through the method is red and brown in color and properly sweet and sour; the hawthorn fruit vinegar beverage has excellent flavor and taste of flavor substances on basis of keeping original nutrient substances; meanwhile, continuous fermentation can be carried out and the production efficiency is high.
Owner:TIANDI YIHAO BEVERAGE JIANGMEN CITY

Process of efficiently recovering copper from lead matte according to oxygen pressure acid leaching and vortex electrolysis techniques

The invention belongs to the field of nonferrous metal hydrometallurgy and discloses a process of efficiently recovering copper from lead matte according to oxygen pressure acid leaching and vortex electrolysis techniques. The method includes: taking lead matte as a raw material, crushing and grinding the lead matte, screening through a 100-mesh sieve, adding into a high-pressure autoclave along with sulfuric acid and a dispersing agent, feeding oxygen for leaching, carrying out liquid-solid separation to obtain solution containing copper sulfate, subjecting the solution containing copper sulfate to vortex electrolytic decopperation to obtain cathode copper, and returning after-electrodeposition liquid to the leaching procedure to replace sulfuric acid serving as the leaching agent. High efficiency in copper recycling can be realized, electrodeposition of copper can be selectively carried out according to the vortex electrolysis techniques, and high current level and current efficiency, low reagent consumption, reduction of production cost and improvement of enterprise benefits are realized. In addition, due to closed cycle of solution, harmful gas emission is avoided, and current concepts of circular economy and environment protection are met.
Owner:XIANGNAN UNIV +1

Process for extracting pachyman from poria coccus wolf

The invention discloses a process for extracting pachyman from poria coccus wolf. The process comprises the following steps: (1) selecting a poria coccus wolf raw material, and conducting ultrafine grinding to obtain poria coccus wolf coarse powder; (2) adding water into the poria coccus wolf coarse powder for soaking, and placing the soaked poria coccus wolf coarse powder in 40000 Hz ultrasonic waves to be treated for 20-25 min; (3) conducting water bathing and then conducting centrifugal separation; (4) conducting enzymolysis separation by adopting a compound enzyme to obtain a filtrate; (5) conducting protein precipitation and filtration, and centrifugally collecting a supernate; (6) concentrating a pachyman extract to be 10 to 20% of the original volume to obtain a pachyman concentrate, and conducting spray drying to obtain coarse pachyman; (7) conducting ultrafiltration, then conducting column chromatography to obtain purified pachyman, and conducting freeze drying so as to obtain the pachyman. According to the process, an ultrasonic-assisted extraction method is utilized, the process steps are simple, the pachyman leaching rate can be obviously increased, the extracted pachyman is low in possibility of stereostructure damage and high in biological activity, and the advantages that the leaching time is shortened, the extraction conditions are mild, and the reaction product is free of toxic or side effect are achieved.
Owner:潜山市三新茶叶专业合作社

Technology for purifying scandium, titanium and vanadium from acid solution step by step

ActiveCN106191447AImprove leaching rateEfficient separation and extractionProcess efficiency improvementHydrofluoric acidKerosene
The invention relates to a technology for purifying scandium, titanium and vanadium from an acid solution step by step. According to the technology, the acid solution obtained by leaching red mud through sulfuric acid is subjected to three-time extraction work, and an extraction organic phase is composed of a P507 extraction agent, a TBP synergist and sulfonated kerosene; in the first-time extraction process, the acid solution is directly subjected to scandium extraction and enrichment without pH value adjustment, after two-phase separation, a scandium-enriched organic phase and a titanium and vanadium containing solution are obtained, the scandium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of sodium hydroxide, and scandium-enriched liquid is obtained; after the titanium and vanadium containing solution is subjected to pH value adjustment, the second-time extraction work is conducted for enrichment and separation of titanium, after two-phase separation, a titanium-enriched organic phase and a vanadium-containing solution are obtained, and after the titanium-enriched organic phase is subjected to sulfuric acid scrubbing and reverse extraction of hydrofluoric acid, titanium-enriched liquid and the vanadium-containing solution are obtained; and after the vanadium-containing solution is subjected to pH value adjustment and reducing treatment, the third-time extraction is conducted, and after two-phase separation, a vanadium-enriched organic phase and raffinate are obtained. The technology has the beneficial effects that the separation efficiency is high, the enrichment multiple is large, the technology is simple, and the number of the kinds of extraction agents is small.
Owner:HENAN POLYTECHNIC UNIV

A method for recovering valuable metals from waste lithium ion batteries

The invention discloses a method for recovering valuable metals from waste lithium ion battery, which comprises the following steps: (1) pretreatment: separating positive and negative electrode powderfrom waste lithium ion battery; 2, leaching, and taking leach solution; 3) purification: adding alkali to that leach solution to adjust the pH value, and removing iron, aluminum and copper to obtainpurified solution; (4) Component control and evaporation concentration: adjusting the proportion of nickel, cobalt and manganese in the purified solution; then evaporating and concentrating, enrichingnickel, cobalt and manganese to set concentration to form precursor preparation liquid; 5) synthesis: passing the precursor preparation liquid, NaOH solution and ammonia water into a reaction kettle,controlling the pH value of the solution in the reaction kettle, carrying out reaction, and filtering after the reaction, wherein the filtered residue is the a ternary precursor. The leaching solution of the invention is purified, nickel cobalt manganese salt is supplemented, evaporated and concentrated, and the precipitant is added to directly synthesize the ternary precursor. The utility modelhas the advantages of short process flow, low consumption of raw materials, high recovery rate and high added value of products.
Owner:赣州寒锐新能源科技有限公司

Method for leaching vanadium from vanadous stone coal ore with fluosilicic acid and sulphuric acid

The invention discloses a method for leaching vanadium from vanadous stone coal ore with fluosilicic acid and sulphuric acid, comprising the following steps: smashing and wet grinding the vanadous stone coal ore so that granularity is less than 0.15mm; adding fluosilicic acid of which dosage is 5-15% of the vanadous stone coal ore by weight percent and is calculated with 100% of fluosilicic acid by weight percent and sulphuric acid of which dosage is 10-25% of the ore by weight percent to leach vanadium at 80-95 DEG C for 2-20 hours; obtaining vanadium-containing leaching liquor by liquid-solid separation after leaching; reducing ferric ion with iron powder; adjusting the pH value to 2.8-3.0 with lime and ammonia; extracting with solvent; oxidizing; adding ammonia to obtain ammonium polyvanadate precipitate; and calcining ammonium polyvanadate to prepare powdered vanadium pentoxide product; wherein, the ratio of the volume of the water in the pulp obtained by wet grinding to the mass of the ore is 1-3:1. The invention has the following beneficial effects: 1. compared with a technology of leaching vanadium from the vanadous stone coal ore solely with the sulphuric acid, the method can save 5%-25% of sulphuric acid; 2. the method creates a condition for leaching vanadium with sulphuric acid, because hydrofluoric acid generated by the hydrolysis of fluosilicic acid can effectively destroy the crystal structure of siliceous-aluminous minerals which contains roscoelite, kaolin, and the like; 3. the fluosilicic acid can be the industrial byproduct fluosilicic acid and the fluosilicic acid-containing industrial waste water; 4. the vanadium leaching rate of the vanadous stone coal ore is high.
Owner:长沙达华矿业技术开发有限公司

Production process for comprehensively recovering valuable metal of copper, cobalt and iron alloy

InactiveCN101717862AReduce energy consumptionWide range of reaction initial temperatureProcess efficiency improvementAlloyHydrometallurgy
The invention relates to a production process for comprehensively recovering valuable metal of copper, cobalt and iron alloy, belonging to the technical field of hydrometallurgy and comprising the steps of: preparing fine alloy powder with the mesh of -100 by vibrating, grinding, screening and grading the copper, cobalt and iron alloy; adding water to the fine alloy powder to stir; then adding a required theoretical quantity of fluorine ions F-; adding inorganic acid to react for 1.5 hours; slowly adding oxidant solution; stirring for 1.5 hours at the continuous temperature of larger than 85 DEG C after adding the oxidant solution; separating solid from the solution; adding a reducer whose use quantity is 1.05 times of the theoretical quantity to the obtained filtrate; stirring at normal temperature; reacting for 2 hours; obtaining cuprous chloride and pre-extraction solution after filtering; and finally carrying out P204 extraction and P507 extraction on the pre-extraction solution; and evaporating and crystallizing to obtain cobalt chloride. The production process has the advantages of environmental-friendly performance, simple operation, high efficiency, energy saving and suitability for industrial production.
Owner:HUNAN KAITONG METAL
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