349results about How to "Improve leaching rate" patented technology

The invention provides a method for leaching copper-cobalt sulfide ore under efficient oxygen pressure, and relates to the technical field of metallurgy. The method for efficiently leaching the copper-cobalt sulfide ores under the oxygen pressure comprises the following steps: mixing materials including the copper-cobalt sulfide ores, sulfuric acid and water, slurrying, and then carrying out an oxygen pressure leaching reaction; and after the oxygen pressure leaching reaction is finished, solid-liquid separation is carried out, and leaching residues and leaching liquid are obtained. According to the method, the self-exothermic reaction of the excess sulfur element in the copper-cobalt sulfide ore is utilized, additional heating is not needed in the reaction process, then the oxygen pressure leaching reaction can be rapidly completed at a high temperature in a short time, and SO2 is not generated in the reaction process. The method for high-efficiency oxygen pressure leaching of the copper-cobalt sulfide ore has the advantages of being high in reaction speed, low in reaction energy consumption, easy to operate, environmentally friendly, easy to achieve industrial application and the like.

The invention discloses a method for extracting valuable metals from black powder of waste lithium ion batteries, and belongs to the technical field of recycling of waste lithium ion batteries. According to the method, valuable metals are extracted from the waste lithium ion battery black powder by adopting low-temperature roasting and water leaching, the waste lithium ion battery black powder is taken as a raw material, sulfamic acid is taken as a roasting agent, the waste lithium ion battery is pretreated, and roasting for carbon removal, metal extraction and water leaching are performed in sequence, so that the valuable metals are obtained. And leaching liquid and leaching residues containing two or more elements of lithium, nickel, cobalt, manganese, iron and aluminum are obtained and are used for further purification and recovery of valuable metals. According to the method provided by the invention, the influence of aluminum dissolution on recovery of other metals is reduced, the use of hydrogen peroxide is avoided, the process flow is shortened, the process cost is greatly reduced, the roasting and water leaching processes cannot corrode equipment, and the whole process cannot generate waste acid to cause secondary pollution.

The invention discloses a short-process preparation method and application of a vanadyl sulfate electrolyte based on vanadium slag valence regulation and control, and belongs to the technical field of vanadium electrolytes. The method comprises the following steps: leaching the vanadium slag by using sulfuric acid to obtain a leaching solution containing low-valence vanadium; extracting vanadium and chromium in the leachate by adopting an amine organic extraction agent; carrying out reverse extraction by using sulfuric acid; the method comprises the following steps of: firstly, extracting and separating vanadium by using a phosphoric acid extracting agent, and finally, carrying out reverse extraction by using sulfuric acid to obtain the vanadium electrolyte which can be used for constructing a VFB-5kW / 10kWh vanadium battery energy storage system. The traditional established thinking that pentavalent vanadium is extracted through vanadium slag oxidation to serve as a vanadium source to prepare the vanadium electrolyte is broken through, the novel technology for extracting the low-valence vanadium solution from the vanadium slag to directly prepare the vanadium electrolyte is provided, the short-process and green novel technology for preparing the vanadium electrolyte from the vanadium slag is constructed, the efficiency of the vanadium electrolyte preparation technology is improved, and the preparation cost is reduced.

The invention discloses a leaching reaction kettle. The leaching reaction kettle comprises a reaction tank, a stirring assembly, a guide cylinder and an aeration pipe. The stirring assembly comprises a stirring part; the flow guide cylinder is arranged in the reaction tank, the flow guide cylinder divides the reaction tank into an inner side space and an outer side space, the flow guide cylinder is arranged around the stirring part and defines the inner side space, the stirring part is used for driving fluid in the inner side space to flow upwards, the flow guide cylinder is provided with an upper opening and a lower opening, and the upper opening is communicated with the lower opening. The inner side space and the outer side space are communicated through the upper opening and the lower opening; and the aeration pipe is used for introducing reaction gas into the lower part of the inner side space. The leaching reaction kettle can improve the leaching efficiency of materials and the utilization rate of reaction gas.

The invention relates to a method for recycling iron phosphate from lithium iron phosphate waste and application of the method, and belongs to the technical field of iron phosphate recycling. Comprising the following steps that firstly, the lithium iron phosphate waste, a reducing agent and sodium carbonate are mixed and roasted at the temperature of 820-890 DEG C, the reducing agent reacts with oxygen in the lithium iron phosphate waste, and Fe (II) easier to leach by acid is generated; subsequently, the roasted product is immersed in a mixed acid and ferrite solution, Fe < 2 + > is dissolved in a solution system through the mixed acid, insoluble iron phosphate precipitates are promoted to be formed, and therefore the Li < + > leaching rate of insoluble phosphate minerals in the roasted product can be increased. According to the method, a mixed acid solution is added, the pH value in an acid leaching system is limited to be 1.0-5.0, so that impurity components containing copper, manganese, aluminum, nickel and the like in a roasted product can be dissolved in the mixed acid solution, finally, an iron phosphate-containing solid obtained after solid-liquid separation is calcined, and comprehensive utilization of recovering lithium and iron phosphate from the lithium iron phosphate waste at the same time is achieved.

The invention provides a method for deeply extracting vanadium from vanadium-containing steel slag, which comprises the following steps: mixing the vanadium-containing steel slag and an oxygen-containing microbubble ammonium bicarbonate solution, and carrying out mechanochemical ball milling activation to carry out leaching reaction to obtain a vanadium extracting solution. According to the method, advanced oxidation is cooperated with mechanochemical ball milling to activate and strengthen deep extraction of vanadium in the vanadium-containing steel slag, wrapping of substances such as calcium silicate and calcium titanium oxide on a vanadium-containing solid solution phase is destroyed through mechanical activation, and O2 microbubbles in an ammonium bicarbonate medium are promoted to generate active oxygen under excitation of mechanical activation energy; exposure reaction and deep oxidation extraction of a vanadium-containing phase under mild conditions are achieved, the content of V2O5 in tailings after vanadium extraction is smaller than or equal to 0.5%, and the vanadium extraction rate is 83% or above.

The invention discloses a method for recovering valuable metals in a retired ternary lithium battery based on cascade separation of a deep eutectic solvent and oxalic acid. The method comprises the following steps: 1) stirring and leaching the deep eutectic solvent and black powder at 110-130 DEG C for 3-4 hours according to a liquid-solid ratio of (5-50): 1 (ml: g) to obtain a leaching solution; (2) measuring the contents of lithium, cobalt, nickel and manganese in the leachate according to ICP (Inductively Coupled Plasma), adding oxalic acid exceeding the required amount according to the contents of lithium, cobalt, nickel and manganese, stirring, standing, and centrifuging to obtain a precipitate mixture of nickel oxalate precipitate, cobalt oxalate precipitate and manganese oxalate precipitate and lithium filtrate; and (3) repeating the steps (1)-(2) for at least three times by taking the lithium filtrate obtained at each time as the eutectic solvent, performing rotary evaporation on the obtained final lithium filtrate, adding sodium carbonate, and centrifuging to obtain lithium carbonate precipitate. The purity of the ternary lithium precursor prepared from cobalt, nickel and manganese obtained through the method can reach 99% or above, the purity of obtained lithium carbonate reaches 95% or above, and closed-loop recycling is achieved.

The invention provides a method for removing potassium and sodium in lithium slag. The method comprises the following steps: S1, providing the lithium slag; the lithium slag contains a potassium element and a sodium element; s2, grinding the lithium slag to obtain slag powder; s3, the slag powder and an alkaline leaching agent are mixed in water, and to-be-treated liquid is obtained; performing hydro-thermal treatment on the to-be-treated liquid to obtain reaction liquid; the alkaline leaching agent comprises Mg (OH) 2 and CaO, and the mass ratio of Mg (OH) 2 to CaO is 1: (3-8); the temperature of the hydrothermal treatment is 190-240 DEG C; and S4, carrying out solid-liquid separation on the reaction liquid to obtain tailings and a potassium-sodium separation liquid. According to the invention, the problem of removing potassium and sodium elements from the lithium slag can be fundamentally solved, and the potassium and sodium are prevented from damaging building materials along with the lithium slag.

The invention belongs to the field of recycling treatment of waste lithium iron phosphate batteries, and particularly relates to a method for efficiently recycling waste lithium iron phosphate through oxygen-sodium persulfate leaching. According to the method, the lithium in the lithium iron phosphate waste battery is leached and extracted by adopting the environment-friendly reaction solution, and oxygen is additionally introduced in the extraction process, so that the leaching rate of the lithium is effectively improved, the leaching rate of iron is effectively reduced, and the overall leaching time is effectively shortened; therefore, the problem of secondary pollution to the environment when inorganic acid / alkali is recycled by an existing wet method is avoided, the process is low in cost and easy to implement, the extraction rate is high, and economic benefits of waste LFP battery recycling are considered from multiple aspects.

This invention relates to a method for the combined leaching of high-silicon zinc roasted ore and high-sulfur zinc oxide powder, belonging to the field of hydrometallurgical technology. The high-sulfur zinc oxide powder is leached neutrally to obtain zinc oxide leaching residue and zinc powder leaching solution. The zinc powder leaching solution is then mixed with high-silicon zinc roasted ore slurry for controlled silica leaching of the high-silicon zinc roasted ore to obtain zinc ore leaching residue and zinc ore leaching solution. The zinc powder leaching residue and zinc ore leaching residue are mixed and then subjected to low-acid leaching to obtain low-leaching residue and low-leaching solution. The low-leaching residue is then subjected to hot acid leaching to obtain hot-leaching residue and hot-leaching solution. The hot-acid residue is then subjected to high-acid leaching to obtain lead-silver slag product and high-leaching solution. The hot-leaching solution is neutralized and reduced by high-sulfur zinc oxide powder to obtain neutralized solution and neutralized residue. The neutralized solution is then subjected to mineralization and iron precipitation to obtain hematite product and iron-removed solution. This invention can effectively control the leaching of silicon in the high-silicon zinc roasted ore leaching process, and simultaneously realize the oxidative leaching of sulfides in zinc oxide powder and the reductive leaching of zinc ferrite in zinc roasted ore, thus simplifying the leaching process of zinc roasted ore and zinc oxide powder.

The invention relates to the technical field of catalyst recovery, and discloses a method for non-destructively recovering a waste catalyst carrier and noble metal. The present invention uses a noble metal leaching agent comprising an oxidizing agent, a ligand precursor, and water for recovering spent catalyst supports and noble metals. The method comprises the following steps: after roasting and reducing the waste catalyst, leaching the waste catalyst in the precious metal leaching agent, and carrying out first solid-liquid separation and washing to respectively obtain a waste catalyst carrier and precious metal. According to the method, a form of firstly reducing and then oxidizing is adopted, a compound leaching system is used for replacing a traditional leaching system based on hydrochloric acid, acid gas volatilization during leaching reaction is reduced, environmental pollution is reduced, and the operation environment is improved.

The invention discloses a method for preparing lithium carbonate by using a waste lithium iron phosphate positive electrode material, which comprises the following steps: pulverizing the waste lithium iron phosphate positive electrode material, sieving, fully mixing the pulverized waste lithium iron phosphate positive electrode material with concentrated sulfuric acid, and carrying out dump leaching for 6-12 hours; primary leaching: raw materials come from secondary leaching residues, acid is adjusted to the pH value of 1.5-2.0, sodium ferrate is added, stirring leaching is performed at the temperature of 60-70 DEG C, leaching liquid serves as secondary leaching liquid, and leaching residues are recycled to be used for preparing iron phosphate raw materials; and secondary leaching: the solution comes from the primary leaching solution, acid is consumed by using heap leaching raw materials, the end point PH is controlled to be 3.0-3.5, sodium ferrate is added, and stirring leaching is performed under the condition of 45-55 DEG C. No hazardous waste is generated in the whole process, leaching residues are used as raw materials for preparing iron phosphate, calcium carbonate can be recycled for acid adjustment, and harmless treatment is truly achieved.

The invention provides a laterite-nickel ore gradient continuous leaching method which comprises the following steps: laterite-nickel ore sequentially passes through a fusion leaching area, a stable leaching area and an adjustable leaching area to be continuously leached in the material conveying direction of the laterite-nickel ore; acid liquor is added into the fusion leaching area and the stability leaching area; the temperature of the fusion leaching area is T1 and the reaction time is t1, the temperature of the stable leaching area is T2 and the reaction time is t2, and the temperature of the adjustable leaching area is T3 and the reaction time is t3; wherein T < 2 > < gt >; t3 > = T1, and t2gt; t3gt; t3gt; t1. According to the method, the high-pressure acid leaching process is subjected to partition treatment, the one-time leaching efficiency is improved, scaling is slowed down, accordingly, scaling of a reaction kettle can be reduced while further leaching of Fe and Al is inhibited, acid liquor and waste residues can be fully utilized, efficient leaching of nickel, cobalt and manganese is achieved, and waste heat generated after slurry is discharged from an adjustable leaching area can be recycled.

The invention relates to a method for acid leaching of fluorine and lithium in cathode alkaline leaching residues and combined treatment of alkaline leaching waste liquid, and belongs to the technical field of aluminum electrolysis waste cathode recycling. The method comprises the steps that the alkaline leaching residues of aluminum electrolysis waste cathodes are added into an AlCl3 solution for ultrasonic leaching, hydrochloric acid is used for adjusting the leaching pH value, and after leaching, solid-liquid separation is conducted to obtain primary carbon powder and first filtrate; returning the first filtrate to a system for recycling to obtain a final leachate with relatively saturated electrolyte content; washing the primary carbon powder with deionized water to obtain high-purity carbon powder; and the final leaching solution and the waste cathode alkali leaching solution are mixed and precipitated to obtain lithium-containing cryolite and a precipitation solution, and the precipitation solution can be returned to an alkali leaching system to be used for preparing alkali liquor. According to the method, valuable substances in the alkaline leaching residues and the alkaline leaching waste liquid in the aluminum electrolysis waste cathodes are effectively recycled, meanwhile, harmless treatment of the waste cathodes is achieved, and the recycling process of the valuable substances in the alkaline leaching residues and the alkaline leaching waste liquid in the aluminum electrolysis waste cathodes is greatly simplified.

The invention discloses a method for treating copper cobalt oxide ore, and belongs to the technical field of non-ferrous metal hydrometallurgy. The method comprises the following steps: carrying out critical leaching on the copper-cobalt oxide ore to obtain a leaching solution and leaching residues, returning the leaching residues to a wastewater and waste residue neutralization process, carrying out a sulfuration sectional copper-cobalt deposition process on the leaching solution to obtain two products of copper sulfide and cobalt sulfide, carrying out targeted adsorption cobalt recovery on the produced sulfurized solution, returning the desorbed solution to a critical leaching process, and carrying out secondary leaching on the desorbed solution. After adsorption, liquid enters a waste water and waste residue neutralization process, produced neutralization residues are piled up, and produced neutralization water is returned to a critical leaching process. The method sequentially comprises the key procedures of critical leaching, vulcanization segmented copper and cobalt deposition, targeted adsorption and waste water and waste residue neutralization. The process adopted by the invention has the advantages of short process flow, high recovery rate, zero discharge of wastewater and the like. Compared with a traditional process, the copper and cobalt leaching rates can reach 90% or above, and the cobalt recovery rate can be increased by 10% or above.

The invention relates to the technical field of industrial waste recycling and carbon dioxide mineralization, and discloses a leaching method for calcium ions in calcium-containing solid waste. The method for leaching the calcium ions in the calcium-containing solid waste comprises the following steps that S1, the calcium-containing solid waste is subjected to pre-screening and ball milling, and solid waste micro powder is collected; s2, mixing the solid waste micro powder with a leaching agent, and reacting to obtain a calcium ion leaching solution; s3, introducing CO2 gas into the calcium ion leachate, reacting, and separating to obtain a calcium carbonate solid and a regenerated leaching agent; in the step S2, the leaching agent comprises protonated organic amine. According to the method for leaching the calcium ions in the calcium-containing solid waste, the leaching agent selectivity is good, the calcium ion leaching rate is high, the reaction condition is mild, ammonia escape in the leaching process is little, and environment friendliness is achieved; by introducing CO2 gas into the calcium-containing leachate, the leaching agent can be quickly regenerated, and the cyclic stability of the regenerated leaching agent is good.

The invention discloses a method for producing a lubricating product by using tungsten-molybdenum resources, and relates to the technical field of tungsten-molybdenum resource utilization, and the method comprises the following steps: adjusting the mass ratio of Mo to WO3 in the tungsten-molybdenum resources to 10: (2-8), crushing, and roasting to obtain a roasted material; adding ammonia water into the roasted material for size mixing, and performing oxygen pressure ammonia leaching; sulfuric acid is added into the leachate for acid precipitation, and precipitates are obtained; introducing hydrogen sulfide gas to sulfurize the precipitate to obtain thioammonium salt; adding hydrochloric acid into the thioammonium salt for acidification reaction to obtain trisulfide; calcining the trisulfide in a protective atmosphere; and crushing the calcined material to obtain the product. According to the invention, a mixture of tungsten disulfide and molybdenum disulfide is obtained by utilizing a large amount of tungsten-molybdenum paragenic ore or a tungsten-molybdenum-containing waste catalyst in nature through a hydrometallurgy process, and can be used as a solid lubricating material, so that the production cost of the solid lubricating material is effectively reduced, the recovery rate of tungsten in ore is increased, and the environmental pollution is reduced.

The invention discloses a method for recovering scandium and titanium from Bayer process red mud. The method comprises the following steps: (1) drying the red mud; (2) mixing the dried red mud and phosphoric acid, performing acid leaching reaction, and then filtering and drying to obtain pretreated red mud; (3) carrying out acid leaching on the pretreated red mud by adopting a phosphoric acid-hydrogen peroxide system, and carrying out solid-liquid separation to obtain red mud leachate containing scandium and titanium and iron-rich leaching residues; (4) mixing the red mud lixivium containing scandium and titanium with a P204 extracting agent, stirring, oscillating and carrying out oil-water separation to obtain a scandium-loaded organic phase and a titanium-containing lixivium, and carrying out acid pickling on the organic phase for multiple times; and (5) adding ammonia water into the titanium leachate to adjust the pH value, heating and stirring, standing and precipitating to obtain amorphous titanium phosphate, and carrying out acid pickling after solid-liquid separation. According to the method, scandium and titanium in the red mud are separated and recycled in a two-stage acid leaching-extraction-precipitation combined mode. The selectivity of scandium and titanium is improved. And technical support is provided for recovery of scandium and titanium and comprehensive utilization of red mud.

The invention belongs to the technical field of lithium resource extraction, and particularly relates to a method for intensively leaching lithium in low-grade refractory lepidolite through a full-wet method. The method comprises the following steps: S1, a strengthening step: adding alkali liquor into lepidolite according to a solid-to-liquid ratio of 1: (1-1.5), stirring and reacting at 20-30 DEG C for 2-3 hours, and then filtering to obtain strengthening liquid and strengthening slag; s2, acid leaching is conducted, specifically, an acidic material and an auxiliary agent are added into the reinforced slag, stirring reaction is conducted for 0.5-1.5 h at the temperature of 90-100 DEG C, and leaching liquid and leaching slag are obtained; and S3, lithium precipitation: adding an excessive saturated sodium carbonate solution into the leachate, reacting at 80-90 DEG C for 1-2 hours, and filtering to obtain lithium carbonate. According to the method disclosed by the invention, the step of strengthening pretreatment is added before leaching, so that low-grade and refractory lepidolite can be better destroyed, subsequent leaching is more facilitated, the leaching difficulty is reduced, and the leaching rate of lithium is improved.

The invention discloses a method for improving the manganese leaching rate and a manganese leaching process, and belongs to the technical field of manganese extraction.The method comprises the steps that after the water content of mineral aggregate is adjusted to be 10% or above, microwave pretreatment is conducted; adding an auxiliary agent polyvinylpyrrolidone into the mineral aggregate subjected to microwave treatment; mixing the mineral aggregate added with polyvinylpyrrolidone with water, carrying out wet grinding, and adding ultrasonic treatment in the wet grinding process to obtain ore pulp; concentrated sulfuric acid, water and the obtained ore pulp are mixed for sulfuric acid leaching treatment; and after the sulfuric acid leaching treatment reaction is completed, solid-liquid separation is carried out, and a leaching solution with the high manganese content is obtained. The method can improve the manganese leaching rate of the manganese ore.

The invention relates to a method for leaching gold by catalyzing thiosulfate through a solid catalyst, and belongs to the technical field of production of precious metal gold through hydrometallurgy. The method comprises the following steps: grinding gold ore, and mixing to obtain gold ore pulp with the concentration of 10-40wt%; the method comprises the following steps: adding molybdenum disulfide solid powder or molybdenum disulfide nano-suspension into gold ore pulp, then adding thiosulfate, adjusting the pH value to 9-12, leaching gold under an illumination condition, filtering to obtain a gold leaching solution, and cleaning molybdenum disulfide obtained by filtering for reutilization; or the container wall is coated with molybdenum disulfide printing ink, gold ore pulp is added, then thiosulfate is added, the pH is adjusted to be 9-12, gold leaching and filtering are conducted under the illumination condition, gold leaching liquid is obtained, and the molybdenum disulfide printing ink coated on the container wall is reused after being cleaned. According to the method, molybdenum disulfide is used as a solid catalyst, and thiosulfate gold leaching can be efficiently catalyzed under conventional conditions. The cleaning device has the characteristics of high cleaning efficiency and high universality.

The invention provides a clay lithium ore pretreatment method which comprises the steps that clay lithium ore powder is soaked in an acid solution containing a surface active agent, and the surface active agent is at least one of a cationic surface active agent, a non-ionic surface active agent and an ampholytic surface active agent; the acid solution is at least one of a sulfuric acid solution, a hydrochloric acid solution, a nitric acid solution and a phosphoric acid solution; the invention further provides a method for extracting lithium from the clay lithium ore. The method comprises the pretreatment method. The acid solution containing the surfactant is used for pretreatment, hydroxyl groups attached to the surface of the clay lithium ore powder can be activated, the bleaching effect is achieved, and subsequent dissolution of non-ferrous metal ions such as Fe is reduced; the surface tension of the clay lithium ore powder can be reduced, the contact area of an acid solution is increased, the clay lithium ore powder is more sufficiently infiltrated and permeated by the acid solution, and the leaching rate of lithium is increased.

The invention discloses a method for recovering a lithium element in a retired ternary lithium battery positive electrode material, and relates to the technical field of battery recovery, and the method comprises the following steps: S1, uniformly mixed carbon powder and ternary positive electrode recovery powder are placed in a reduction furnace, and a carbon thermal reduction reaction is carried out under the protection of a nitrogen atmosphere to obtain a reduced material; s2, the reduction material, pure water and grinding balls are put into a pressurized ball milling tank, carbon dioxide is introduced, ball milling is conducted in the high-pressure environment of 2-5 MPa, and ball milling slurry is obtained; s3, carrying out solid-liquid separation on the ball-milled slurry to obtain a lithium extraction leachate; s4, the lithium extraction leachate is subjected to impurity removal, concentration and thermal decomposition, and lithium carbonate crystals are obtained; and S5, washing, drying and crushing the lithium carbonate crystals to obtain the battery-grade lithium carbonate. According to the method disclosed by the invention, lithium is extracted by matching carbon dioxide with ball-milling water in a high-pressure environment, so that the leaching efficiency and the leaching rate of the lithium element in the reduced ternary positive electrode recycled powder can be effectively improved.

The production line comprises a crushing and grinding device, a liquid preparation system, an electrolysis system, a post-treatment system and a manganese residue treatment system, and the liquid preparation system comprises a slurrying barrel, a chemical combination barrel, a first filter press, a vulcanization pool, a second filter press, a purification tank, a third filter press and an elevated tank. The crushing and grinding device is communicated with the slurrying barrel, an outlet of the slurrying barrel is communicated with the chemical combination barrel, the chemical combination barrel is communicated with the first filter press, the first filter press is communicated with the vulcanization pool, the vulcanization pool is communicated with the second filter press, the second filter press is communicated with the purification tank, the purification tank is communicated with the third filter press, the third filter press is communicated with the head tank, and the head tank is communicated with the electrolysis system. The anolyte storage tank is respectively communicated with the slurrying barrel and the chemical combination barrel, and the first filter press, the second filter press and the third filter press are connected with a manganese slag treatment system. According to the production line, the leaching rate and the impurity removal rate can be increased, manganese slag recycling is achieved, and generation and emission of pollutants in the production process are reduced.

The invention discloses a method for preparing lithium carbonate and lithium phosphate by extracting lithium from glass polishing waste residues. The method comprises the following steps: (1) wet leaching; (2) acid recovery; (3) nanofiltration and impurity removal; (4) deeply removing impurities; (5) concentrating and precipitating lithium: evaporating and concentrating the filtrate obtained in the step (4) until the concentration of Li is greater than or equal to 20g / L, then heating, adding a sodium carbonate solution, carrying out lithium precipitation reaction to obtain a lithium carbonate solid and a mother solution after lithium precipitation, and drying the lithium carbonate solid to obtain an industrial-grade lithium carbonate product; and then preserving heat of the mother liquor after lithium precipitation, adding a phosphate solution into the mother liquor after lithium precipitation, reacting, filtering and drying to obtain a lithium phosphate product. According to the invention, lithium in the glass polishing waste residue is recycled to obtain lithium carbonate and lithium phosphate products; more than 70% of the used acid is recycled, so that the operation cost is greatly reduced; high-temperature roasting is not needed, the energy consumption is low, and the method is an efficient and energy-saving technology.

The invention discloses a preparation method and application of lignin, and relates to the technical field of preparation of natural organic compounds. The preparation method comprises the following steps: mixing a plant raw material containing lignin with a solution containing sulfurous acid and / or sulfite, reacting at the temperature of 100-180 DEG C under the pressure of 0.4-0.8 MPa, and performing solid-liquid separation to obtain lignin filtrate. The lignin and cellulose obtained through the preparation method are easy to separate, the lignin content in the lignin filtrate is high, the lignin filtrate is applied to zinc smelting oxygen pressure leaching, commercially available lignin can be completely replaced, the proportion of flotation tailings cannot be increased, sulfur recovery is more facilitated, and the TOC content and the chloride ion content of the oxygen pressure leaching liquid can be reduced.

The invention relates to the technical field of solid waste recovery, in particular to a high-efficiency recovery process for valuable metals in metallurgical solid waste, which comprises the following steps: grinding and crushing the metallurgical solid waste containing zinc, iron, nickel, silver, copper, tin and indium to obtain solid waste residues, then adding a binder into the waste residues, uniformly mixing, and compressing into a ball to obtain waste residue pellets; the waste residue pellets are subjected to drying and acid leaching-oxidation treatment, the porosity of the dried waste residue pellets can be improved, and the contact area between the dried waste residue pellets and acid liquor and an oxidizing agent is increased; the synergistic effect of acid leaching and oxidation reaction can improve the leaching rate of valuable metals and improve the recovery efficiency of the valuable metals, in addition, the synergistic leaching technology can achieve a higher leaching effect in a shorter time, and is matched with common chemical extraction methods such as replacement reaction and the like, efficient recovery of organic metals in metallurgical solid wastes can be achieved, and the recovery rate of the organic metals in the metallurgical solid wastes is improved. The recovery rate of zinc, iron, nickel, silver, copper, tin and indium is greater than 99%, and the energy consumption and the cost are reduced.

The present invention provides a leaching method for sulfide minerals, which comprises: grinding the sulfide minerals for a second time, adding concentrated sulfuric acid during the second grinding for pre-activation, and obtaining a second-grinded material; adding the second-grinded material into a sulfuric acid solution for normal pressure leaching to obtain a normal pressure leaching slurry; wherein, at least one of stirring, introducing oxygen, and maintaining the normal pressure leaching temperature is performed during the normal pressure leaching process; filtering the normal pressure leaching slurry to obtain normal pressure leaching slag and normal pressure leaching liquid; slurrying the normal pressure leaching slag with sulfuric acid solution, and then performing pressure leaching, and performing at least one of introducing oxygen, adjusting the air pressure, and adjusting the initial temperature of the pressure leaching during the pressure leaching process, filtering after the reaction is complete, and obtaining a pressure leaching liquid and a pressure leaching slag. The method can improve the leaching rate of the target metal in the normal pressure leaching stage, reduce the processing amount of sulfide minerals in the pressure leaching stage, and reduce energy consumption, cost, and safety hazards.

The invention relates to the technical field of separation devices, in particular to an efficient sulfide slag separation device which comprises a mounting base, a fixing support is arranged on the mounting base, an oxidation leaching mechanism for oxidizing and leaching sulfide slag is arranged on the fixing support, and a slag treatment mechanism for grinding the sulfide slag into powder is arranged at the upper end of the oxidation leaching mechanism. A quantitative liquid injection mechanism for automatically adding a sulfuric acid solution is arranged on the side face of the slag treatment mechanism, an auxiliary discharging mechanism for filtering slurrying liquid is arranged on the mounting base, the oxidation leaching mechanism comprises a slag leaching round tank detachably mounted on a fixing support, and an exhaust support is movably mounted in the slag leaching round tank. According to the device, the oxidation leaching mechanism is arranged, and the oxygen storage tank and the exhaust bracket are matched with each other, so that oxygen can spirally flow upwards from the bottom of the slag leaching round tank, and the contact area between the oxygen and the slurrying liquid can be effectively increased, so that the oxygen and the slurrying liquid can fully react, and the leaching rate of the target non-ferrous metal can also be increased.

The invention provides a method for adjusting a germination process in a malting process, and belongs to the technical field of malting. According to the method, based on the germination uniformity after wheat steeping and the NAD < + > / NADH level indicating the germination activity of barley after wheat steeping, by adjusting the germination temperature and the germination time and combining the synergistic effect of adjustment of fresh air, return air, spraying water amount and spraying time, low malting loss of the germination process and preparation of high-leaching-rate malt can be achieved, and the method is suitable for large-scale popularization and application. The method is key to both a malting maker and a brewer.