2071 results about "Leaching rate" patented technology

The invention provides a method for cooperative activation of fly ash and decomposition of gypsum for recovery of a sulfur resource. According to the method, solid waste, i.e., fly ash, discharged by a coal-fired power plant or coal-fired boiler is used as a raw material, a certain proportion of desulfurized gypsum discharged by the coal-fired power plant or waste phosphogypsum produced in the phosphorus chemical industry is added and mixed with the fly ash, then the obtained mixture is subjected to ball milling, and activation and calcination at a temperature of 950 to 1450 DEG C are carried out for 5 to 180 min; calcium sulfate in the gypsum are almost totally decomposed after calcination, and produced gas contains sulfur dioxide or sulfur trioxide which can be used as feed gas for preparation of sulfuric acid; and calcination enables solid fly ash to be activated, leaching with a sulfuric acid or hydrochloric acid solution is carried out at a temperature of 50 to 100 DEG C, and the leaching rate of alumina is greater than 80%. The method provided by the invention has the advantages that since all the raw materials are solid waste, the purpose of treating the waste by using the waste is achieved; elemental sulphur in the gypsum can be recovered; and the fly ash can be activated and activity of the fly ash can be improved, so a high alumina recovery rate at a low temperature can be realized. With the method, high-efficiency extraction of alumina in the fly ash is realized; the sulfur resource in the gypsum is recovered; shortage in industrial sulphur in the sulfuric acid industry in China is compensated; and the method has good economic benefits and wide industrial application prospects.

Addition of base improves the homogeneity of aqueous copper amine complex preservatives injected into wood. The base includes at least a portion of alkali metal hydroxides, alkali metal carbonates, alkali metal phosphates, alkali metal borates, and/or alkali metal pyrophosphates, the corrosivity of the composition to steel and galvanized steel is reduced, and the leach rate of the copper from the wood is also reduced.

The invention discloses a method for producing alumina by disposing and utilizing industrial solid wastes, in particular to a method for preparing alumina by fly ash, comprising the steps as follows: the fly ash is mechanically activated; the activated fly ash, water and concentrated sulfuric acid react in a reaction kettle under the conditions of heating and pressurizing; the solid is separated from the liquid after the temperature of the reaction is reduced so as to gain aluminium sulfate liquid; the aluminium sulfate liquid is evaporated, concentrated and cooled so as to precipitate aluminium sulphate crystals; the aluminium sulphate crystals are dehydrated and decomposed to gain gama-Al2O3 and SO3; coarse gama-Al2O3 is dissolved in alkaline solution; after the solid is separated from the liquid, the pure sodium aluminate solution is gained; aluminum hydroxide crystal seed is added to the sodium aluminate solution so as to precipitate the aluminum hydroxide; the coarse gama-Al2O3 can be prepared by circularly dissolving the seed-precipitated alkaline solution after vaporization-concentration; the metallurgical alumina can be gained by baking the prepared aluminum hydroxide. The method adds no additive, can lead the alumina in the fly ash to be effectively leached out with the leaching rate more than 90% and saves the energy resource.

The invention relates to a method for separating tellurium from tellurium slag, which comprises the following steps: firstly, grinding the tellurium slag, leaching out the obtained product in an aqueous solution, purifying and neutralizing a water leaching solution, and producing tellurium dioxide; secondly, performing hydrochloric acid leaching on water leaching residue in a hydrochloric acid system, cooling and filtering an acid leaching solution, and returning acid leaching residue to an anode sludge treatment process; thirdly, performing controlled potential reduction on the acid leaching solution to produce coarse tellurium, and performing roasting and impurity removal on the coarse tellurium and the tellurium dioxide produced by neutralization to obtain pure tellurium dioxide; and fourthly, using the conventional method to reclaim valuable metals such as copper, bismuth, tin, and the like from a reduced solution respectively. The total tellurium leaching rate of the method is as high as more than 98 percent, and the produced coarse tellurium has the advantages of low content of impurity elements, small amount of return slag, small modification amplitude of equipment, short treatment time, and low treatment cost.

The invention discloses a recovery method for a cathode material of a waste lithium iron phosphate battery. The recovery method comprises the following steps: firstly, placing a positive plate obtained through disassembly of the waste lithium iron phosphate battery in an ultrasonic machine containing a dilute alkali liquor to be processed, so that a lithium iron phosphate material is separated from an aluminum foil; then, drying the lithium iron phosphate material, after that, performing acid leaching under a normal-temperature condition, and controlling the quantity of an acid solution to ensure that the pH of the solution is 2.5-6.5 after finish of a reaction and iron exists in insoluble residues in the format of iron phosphate, wherein the leaching rate of lithium is more than 97% and the leaching rate of iron is less than 0.1%; and performing filtering to obtain a filtrate and insoluble iron phosphate, performing heat treatment on the insoluble residues to remove organics so as toobtain ferric phosphate, and after purification and enrichment of the filtrate, adding trisodium phosphate for a reaction to obtain lithium phosphate. In the whole recovery process, the yields of lithium and iron are respectively 96% and 99.5%. The recovery method has the advantages that used equipment is simple, the technological process is short, and valuable raw materials are efficiently recovered.

The invention discloses a normal-pressure leaching method simultaneously processing laterites with high iron content and high magnesium content, comprising the following steps of: screening the laterites with high iron content and high magnesium content; adding sulfuric acid to the laterite with high iron content for leaching so as to obtain leaching residue A and a leaching solution B; adding the laterite with high magnesium content to the leaching solution B, leaching to obtain leaching residue C and a leaching solution D; carrying out magnetic separation on the leaching residue C, wherein a magnetic part E is recovered as an iron product, and a non-magnetic part F and the leaching residue A are mixed to be used for recovering silicon products; delivering a part of the leaching solutionD into a purifying and recovering process, and returning the other part of the leaching solution D into the leaching process of the laterite with high iron content, and carrying out a next leaching period; repeating the leaching period for 4-5 times, and completely delivering a leaching solution I obtained from a last leaching period into the recovering processes of nickel, cobalt, aluminum and magnesium. The normal-pressure leaching method has the advantages of low cost and acid consumption and high leaching efficiency of the nickel and the cobalt and realizes the efficient separation and the recycling of iron, silicon, the nickel and the cobalt and the discharge without acid liquor.

The invention discloses a method for leaching limonitic laterite nickel ore and relates to a process method for recovering nickel, cobalt and iron through treatment of laterite nickel ore by wet process. The method is characterized in that the technical process comprises: (1) grinding raw limonitic laterite nickel ore into fine powder, making slurry, adding sulfuric acid, heating the slurry and leaching the slurry; (2) adding Mg(NO3)2 into the pre-leached slurry, heating with stirring, pressurizing the slurry and leaching the slurry; 3) at the end of leaching, neutralizing the slurry, removing iron and aluminum from the slurry, and separating to obtain a leaching solution and a leaching residue; and 4) washing the leaching residue to obtain washing liquid and iron-enriched slag, neutralizing the leaching solution, precipitating nickel and cobalt, obtaining nickel and cobalt hydroxides, evaporating a mother solution from which nickel and cobalt are separated to crystallize magnesium sulfate and comprehensively recovering magnesium sulfate. The method realizes the high-efficiency selective leaching of nickel and cobalt, the leaching rate reaches over 90 percent, the iron leaching rate is lower than 0.8 percent and iron-enriched slag with an iron content of over 55 percent is obtained.

The invention discloses a method for separating tombarthite from phosphorus ore and relates to the method for separating the tombarthite from the phosphorus ore containing the tombarthite. The method is characterized in that the process steps are as follows: (1) mixing phosphate concentrate containing the tombarthite with a phosphoric acid solution for performing reaction; (2) filtering for getting a reaction solution and slag containing the tombarthite; (3) adding acid into the slag containing the tombarthite for leaching for getting leachate containing the tombarthite, and further recycling the tombarthite through one or more of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and (4) performing decalcification on the reaction solution obtained by filtration and then returning to the step (1). By adopting the method, the precipitation rate of the tombarthite in the phosphorus ore is greater than 85%, the slag rate is small, the grade of the tombarthite in the slag is high, the leaching rate of the tombarthite in the slag is high, no additives are added during the process and the product quality of the phosphoric acid is not affected; and furthermore, the phosphoric acid used during the process can be self-produced and can also be circulating dilute phosphoric acid, dilute phosphoric acid and the like generated during the production process of the phosphoric acid, thereby being tightly linked with the production process of the phosphoric acid through the sulfuric acid method.

The invention relates to a stirring type cereal sour milk and a method of preparing the same. The cereal sour milk is made through lactobacillus and probiotics ferment by using raw materials with the following weight components: raw fresh milk of 700-875 parts, cereal powder 1-30 parts; additive agent for dairy food of 5-44 parts; lactobacillus strain/functionality probiotics strain of 0.2-0.8 parts; corrective of 48-82 parts; stabilizing thickening agent of 3-10 parts; homogeneous pourable dense quasi-fluid which is the external appearance showing the color of added cereal powder with suspended corresponding cereal powder; the tissue is fine, smooth and uniform and a few whey is allowed to be precipitated; organoleptic attribute, nutritive index, health indicator and content of lactobacillus series of the cereal sour milk are all better than that in the GB2746 cultured milk quality index. The present invention is characterized in that the cereal powder that is formed by pulverizing and swelling processes reserves the nutrient of cereal to the utmost extent and improves the hot water leaching rate and absorption rate of its nutrient components; the technique is more compact and the operation is easy; the production efficiency is high and the consumption human populations of the products are widened; the cereal sour milk is easy to digested and absorbed, and the taste is better.

The invention discloses a method for preparing electrolytic manganese metal with low-grade pyrolusite wet leaching, which comprises the following steps of: after low-grade pyrolusite is crushed and screened, mixing slurry with electrolytic manganese anolyte, adding sulfuric acid to control acidity, and reducing high-valent manganese insoluble in water into low-valent manganese readily soluble in water through a redox reaction by using reduced iron powder or waste iron scraps as a reducing agent; controlling certain acidity, reaction temperature and time, stirring and leaching, and then precipitating and filtering; purifying, decontaminating and separating a filter liquor to obtain a pure manganese sulfate solution; and electrolyzing the manganese sulfate solution to obtain an electrolytic manganese product, wherein the leaching rate of manganese is higher than 98%, the recovery rate of manganese is higher than 90%, and the purity of electrolytic manganese metal is higher than 99.8%. The method has the advantages that the raw materials of the reducing agent have wide sources and low price, the reaction time is short, the conditions of the leaching process are mild, the leaching rate of manganese is high, the purification process is simple, and the process route of the present carbonic acid manganese ore for preparing electrolytic manganese metal is not changed.

The invention provides a method for extracting indium from indium-rich smoke dust by using an oxygen pressure technology. The method is characterized by comprising the following steps of: carrying out leaching indium extraction of the difficult-to-handle indium-rich smoke dust of a Pb-Sn reverberatory furnace by adopting a wet-process metallurgical oxygen pressure acid leaching technology, and highly enriching and recycling valuable metals in the raw material; and purifying to remove impurities of leachate, and carrying out extraction, replacement and electrolytic refining, thereby obtaining greater than 99.995% of electrical indium products. The technology method has the advantages that the indium leaching rate of the indium-rich smoke dust of the Pb-Sb reverberatory furnace and the enrichment rate of the valuable metals can be obviously increased, and the comprehensive recycling effect can be achieved, thereby waster water of indium smelting can be discharged up to the standard after being processed with low cost, the environmental pollution in the indium extraction process is eliminated. In the process, the leaching rate of the indium is more than 97%, leaching residues containless than 0.01% of indium, the enrichment rate of plumbum, tin, bismuth and zinc is more than 98%, the quality of refined indium products is more than 99.995%, and plumbum enriching slag containing greater than 60% of Pd is obtained. The technical scheme can independently form a system, can also be used for improving and perfecting old technologies and has higher popularization and application value.

The invention relates to a method for leaching vanadium from vanadium-containing bone coal, and belongs to the technical field of metallurgical wet extraction of high-melting-point rare metals. The method adopting the two-stage oxygen pressure acid leaching process comprises the following steps: milling the bone coal; size-mixing with a sulfuric acid solution; and loading in a pressure kettle to acid-leaching in the presence of oxygen. The low-valence vanadium in a coal sample can be converted into the soluble quadrivalent vanadium, and the procedures, such as calcining, dust-collecting, leaching and the like, in the conventional process of 'calcining-leaching' can be concentrated during the procedure of pressure leaching to simplify the process and intensify the procedure, thereby greatly reducing the reaction time, directly and effectively leaching the vanadium-containing bone coal and ensuring that the leaching rate of the vanadium is as high as above 86% by adopting the two-stage oxygen pressure acid leaching process.

The invention provides a method for enhancing metal recovery of a waste lithium ion battery. The method for enhancing the metal recovery of the waste lithium ion battery comprises the steps that firstly, the waste lithium ion battery is calcinated, smashed and sorted so that positive electrode powder materials can be obtained; and then, wet leaching is conducted on the positive electrode powder materials, and mechanical and chemical activation is achieved through a high-energy ball mill in the leaching process, wherein mechanical and chemical activation is executed during leaching, so that the obtained leach liquor can be further used for recovery of valuable metal elements. By the adoption of the method for enhancing the metal recovery of the waste lithium ion battery, the procedure is simple, the operability is high, under the cooperative action of mechanical force and chemical activation, the leaching time of the positive electrode powder material can be greatly shortened, the leaching rate of the metal elements is improved, cost is reduced, and the market prospect is good.

The invention discloses an efficient vanadium extraction method by performing alkali roasting on vanadium mineral. The method comprises the following processing steps of: (1) mixing the vanadium mineral with sodium hydroxide or potassium hydroxide for pellet fabrication, and oxidizing and roasting pellets at the temperature of 300-700 DEG C to obtain roasted clinker; (2) leaching the roasted clinker using water or aqueous alkali corresponding to the step 1, and then carrying out solid-liquid separation to obtain leaching residue and a vanadium dissolution solution; and (3) cooling and crystallizing silicon-removed vanadium digestion solution to obtain vanadate. The alkali roasting is used by the method provided by the invention, because alkali can function as a caking agent in the aggregating process, the caking agent can be saved; not only is the roasting temperature reduced largely and process flow largely shortened, but also no waste gas, ammonia-nitrogen wastewater and the like are discharged, as well as a leachate can be recycled; and a silicate phase can be directly destroyed to promote the destroy and the oxidization of a vanadium phase, and the oxidative enveloping and the leaching hindering of the silicate phase to the vanadium can be prevented so that the efficient vanadium leaching can be realized and the leaching rate can reach more than 95%.

The invention relates to a treatment method for raw materials containing indium, tin, zinc and chlorine, in particular to a method for reclaiming valuable metal aiming at producing smoke dust containing the indium and the chloride during the smelting of the zinc, lead, and the tin. The method uses water to wash and remove the chloride in smoke dust raw material, then a dechlorination material is added into a pressure titanium kettle, is added with sulphuric acid and is aerated with oxygen to perform oxygen pressure heating leaching so that the indium and the zinc are leached and enter solution, the tin is leached out and transformed into metastannic acid to sink into residue, and the filtered tin-containing filter residue is reclaimed and reused; the indium and the zinc enter the solution, extracting agent P204 is adopted to extract the indium to realize the indium-zinc separation, extraction liquid is subject to the back extraction and the zinc plate replacement to produce sponge indium, the sponge indium is electrolyzed, purified, and melted and cast to produce an indium ingot product; and remaining liquid is extracted to reclaim the zinc. The method solves the corrosion resistant problem of the prior equipment, namely the pressure titanium kettle, improves the leaching rate of the indium, deposits the tin at the same time, solves the problem of indium-tin separation, and has the characteristics of reducing energy consumption and production cost, high resource utilization rate, and environmental protection.

The invention relates to a process method for producing copper sulfate by intensified leaching of copper-containing materials, which has short production flow, low energy consumption, good environment and high metal recovery rate and belongs to the technical field of integrated recovery and utilization of nonferrous metal smelting slag. The process method is mainly characterized in that the copper slag is directly intensifiedly leached, and the oxidation roasting process of the copper slag is replaced by intensified leaching, thereby solving the problems of high energy consumption, great environmental pollution and long process flow of the copper slag during the oxidation roasting process. As the process method intensifies the leaching conditions, the leaching rate of copper is improved to be more than 94 percent, and the leaching time is reduced to 2 hours from the conventional 24 hours, thereby greatly improving the production efficiency of the copper sulfate, effectively reducing the production cost, reducing the production flow of the copper sulfate by one third, and greatly improving the metal recovery rate.

The invention relates to a method for extracting nickel and cobalt from a laterite-nickel ore, comprising the following steps of mineral preparation, chloride leaching, solid-liquid separation, leaching liquid concentration, sulfide precipitation, solid-liquid separation and hydrochloric acid recovery of the laterite-nickel ore. A chloride leaching agent is mixing solution of metal chloride and hydrochloric acid; the leaching liquid is concentrated by heating; ferric chloride and magnesium chloride are crystallized and separated out so that Fe/Ni ratio is reduced below 1/5 of Fe/Ni ratio before the concentration; the magnesium oxide or the ferric oxide generated in the hydrochloric acid recovery process is used as neutralizer; polysulfide, just precipitated metal sulfide and metal sulfide are used as sulfuration precipitator; mother liquor with precipitated nickel is roasted with the ferric chloride and the magnesium chloride which are obtained by concentrating the leaching liquid; the metal chloride in the mother liquor and the metal chloride obtained from the concentration are hydrolyzed into chlorine hydride and metal oxide; and the obtained acid is recycled to use. The method for extracting nickel and cobalt from the laterite-nickel ore improves the leaching rate of valuable metals such as nickel, cobalt and so on in the leaching process of the laterite-nickel ore, reduces the energy consumption and is environment friendly.

The invention discloses a method for recovering vanadium and chromium from vanadium and chromium-containing slag, which comprises the following processing steps of: (1) reaction: enabling the vanadium and chromium-containing slag to have a heating oxidation reaction with oxidizing gas in NaOH solution with the mass concentration of 10-60%, and obtaining reactant slurry; (2) dilution: using diluent to dilute the reactant slurry until the concentration of sodium hydroxide of the slurry is 100-350g/L, and obtaining mixed slurry; (3) filtering separation: carrying out filtering separation on the mixed slurry at the temperature of 80-130 DEG C, and obtaining iron-rich tailings and eluate; (4) impurity removal: adding desiliconization agent into the eluate for removing impurities, then carrying out solid-liquid separation, and obtaining liquid subjected to impurity removal and silicon-containing residue; (5) sodium vanadate crystallization: cooling and crystallizing the liquid subjected to impurity removal, and obtaining sodium vanadate and crystallized liquid; and (6) sodium chromate crystallization: evaporating and crystallizing the crystallized liquid, and obtaining sodium chromate. According to the method, the leaching rate of vanadium and chromium reaches 99%, and the final slag contains less than 0.1wt% of vanadium and chromium, so that the method has the characteristics of being low in vanadium and chromium content of the tailings and high in extraction efficiency of vanadium and chromium.

The invention discloses an ore leaching method for ion-adsorbing type rare earth ore. According to the method, a leaching agent solution is adopted for first leaching of the ion-adsorbing type rare earth ore, most of hydrated rare earth ions easy to desorb and positive ions in the leaching agent solution perform exchangeable desorption, and the rare earth ions enter a first rare earth leaching solution; then an auxiliary leaching agent solution or a mixed solution of an auxiliary leaching agent and a leaching agent is adopted for second leaching of the ion-adsorbing type rare earth ore, the auxiliary leaching agent and hydrated rare earth ions difficult to desorb in the ion-adsorbing type rare earth ore perform complexing, desorption of rare earth difficult to leach is promoted, and a second rare earth leaching solution is obtained. The ore leaching method is simple and easy to control, the leaching rate of the rare earth is increased, the consumption of the leaching agent and the auxiliary leaching agent is reduced, production costs are reduced, and the ammonia-nitrogen pollution is reduced.

The invention discloses a cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash. The solidified material, using the slag, fly ash, zeolite, metakaolin, cement clinker as the material to be excited, is obtained through the even mixture with activator after grinding. The liquid activator or combined solid activator can be used as the activator. Mix the material to be excited and activator together, according to the package content of 30-40%, mix with the incineration ash, stir, and maintain to solidification in light of the solidification operation. The cement-based solidified material of the invention can prepare the nuclear waste solidified body with the incineration ash package content greater than 30%, stable mechanical performance, and low leaching rate of radionuclide ion. Especially when solidifying the plutonium-containing waste, the 42-day Pu leaching rate is 10 cm/d. The invention will play an important role in the middle and low radioactive incineration ash processing with good application prospect.

The invention belongs to the technical field of recovery of noble metals from waste catalysts through wet process and particularly relates to a method for recycling metal palladium from waste palladium-aluminum oxide catalysts. The process of the method mainly comprises the following steps: fluidizing, oxidizing and roasting; pre-grinding, reducing and activating; and oxidizing and leaching. The method specifically comprises the following steps: quickly roasting and decarbonizing waste catalysts at 550-650 DEG C in the air atmosphere; cooling the waste catalysts and then finely grinding, reducing and pre-treating the waste catalysts in a reducer-containing hydrothermal solution system; and oxidizing reduction slag in a hydrochloric acid and oxidant system to leach palladium. Through the method for recycling the metal palladium from the waste palladium-aluminum oxide catalysts, the problem of low leaching rate of palladium from palladium-aluminum oxide based catalysts of the petroleum chemical industry in the prior art can be solved. The method is short in process, simple to operate and low in production cost; and the leaching and recycling rate of palladium reaches over 99%.

The invention discloses a method for recovering rare earth from rare-earth-contained phosphorite, which relates to the method for recovering the rare earth from phosphorite and is characterized by comprising the following steps: mixing a rare-earth-contained phosphate concentrate with a phosphoric acid solution for stirring reaction; immersing the rare earth into the solution; carrying out solid-liquid separation to obtain a rare-earth-contained phosphoric acid solution; then, separating and recovering the rare earth from the rare-earth-contained phosphoric acid solution through uniting one or several of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and enabling the phosphoric acid solution after slag is leached and the rare earth is separated and recovered to enter a wet-process phosphoric acid production system to produce a phosphoric acid. In the method for recovering the rare earth from the rare-earth-contained phosphorite, by taking the phosphoric acid solution as a leaching agent, the rare earth is extracted from the rare-earth-contained phosphorite without adding a surface active agent, thereby, the quality of a phosphoric acid product is not influenced, and the rare-earth leaching rate is about as high as 90 percent, and moreover, the leaching agent for leaching the rare earth is the phosphoric acid generated in the phosphoric acid production course, and can also be circular dilute phosphoric acid, diluted phosphoric acid and the like generated in the phosphoric acid production course. The method for recovering the rare earth from the rare-earth-contained phosphorite is tightly linked with a sulfuric acid-method phosphoric acid production process.