418 results about "Acid dissolution" patented technology

The invention discloses a method for preparing a manganese iron phosphate precursor by recycling waste lithium manganese iron phosphate, and belongs to the technical field of lithium ion batteries. The invention provides a method for preparing a manganese iron phosphate precursor by recycling waste lithium manganese iron phosphate, which comprises the following steps: by taking waste lithium manganese iron phosphate battery powder as a raw material, carrying out acid dissolution and filtration to remove graphite and part of impurities; adjusting the pH value of the filtrate to obtain a lithium-ion-rich solution and a ferromanganese precipitate, and adding sodium carbonate into the lithium-ion-rich solution for concentration and crystallization to obtain battery-grade lithium carbonate; carrying out acid dissolution on the ferromanganese precipitate, removing copper and aluminum impurities in the solution, adjusting the ratio of ferromanganese to phosphorus, and mixing with liquid caustic soda in a nitrogen atmosphere to obtain a ferromanganese phosphate precursor; according to the method, the problems of incomplete recovery and insufficient impurity removal of the manganese iron phosphate lithium battery are solved, the battery-grade lithium carbonate and the manganese iron phosphate precursor are prepared during recovery, the value of the recovered product is improved, and the production requirement of the lithium ion battery is met.

The invention discloses a method for recovering lithium, nickel cobalt manganese composite hydroxide and aluminum copper powder from a waste ternary lithium ion battery pole piece. The method comprises the following steps: treating waste pole pieces of a ternary plant or a mixture of positive and negative pole pieces by using a Fenton technology, leaching by using a mixed ferric salt solution, and filtering to obtain lithium-containing leachate and slag; adjusting the pH value of the leachate, oxidizing and filtering to obtain a purified solution and ferric hydroxide precipitate, and adding the purified solution and a lithium hydroxide solution into a reactor for coprecipitation to obtain a deeply purified solution and the nickel-cobalt-manganese composite hydroxide. And dissolving the ferric hydroxide precipitate with dilute acid, adding a reducing agent to generate a ferrous salt solution, and returning the ferrous salt solution for Fenton reaction and leaching reaction. And adding the sodium carbonate saturated solution into the deep purification solution, and crystallizing and precipitating to obtain the battery-grade lithium carbonate. And performing hydrodynamic screening on the leaching residues to obtain an aluminum-copper mixture and graphite residues, and performing grinding and specific gravity separation on the aluminum-copper mixture to obtain high-purity aluminum powder and copper powder. According to the method, the iron salt is directly leached from the pole piece, the used iron salt can be recycled, and the method is suitable for large-scale recovery of the waste ternary lithium ion battery.

The invention provides a method for preparing vanadium pentoxide from iron-containing ammonium metavanadate, which comprises the following steps: S1) mixing iron-containing ammonium metavanadate with water to obtain ammonium metavanadate slurry; s2) mixing the ammonium metavanadate slurry with a complexing agent, adjusting the pH value to 1.5-2.5, carrying out iron dissolving reaction, and carrying out solid-liquid separation to obtain ammonium polyvanadate; 3, ammonium polyvanadate is calcined, and vanadium pentoxide is obtained.According to the method for preparing vanadium pentoxide from iron-containing ammonium metavanadate, the technical thought of acid dissolution-complexing iron removal is provided, the content of iron in vanadium pentoxide is effectively reduced, the process is simple, and the process cost is low.

The invention discloses a method for preparing high-quality iron phosphate in a short process, and belongs to the field of battery material manufacturing. The method comprises the following steps: dissolving iron powder with phosphoric acid to prepare a ferrous phosphate solution, then transferring the solution into a pressurized reaction kettle, blowing high-speed oxygen to oxidize ferrous phosphate into ferric phosphate, adding ammonia water to control the pH value to be 1.5-2.0, and carrying out solid-liquid separation to obtain the water-containing amorphous ferric phosphate, after washing is finished, a water-containing material is fed into a muffle furnace to be subjected to stepped calcination, dehydration and crystal transformation are completed, and the alpha monoclinic system iron phosphate is obtained. The method provided by the invention is short in process flow and low in energy consumption, the oxidant is easy to obtain and safe, the particle size uniformity of reaction materials is good, and the prepared iron phosphate is uniform in particle size, regular in structure and stable in iron-phosphorus ratio and is a high-quality precursor material.

The invention belongs to the technical field of lithium-containing waste treatment, and particularly discloses a method for preparing lithium carbonate by recycling lithium through cooperative treatment of lithium-containing waste. The method specifically comprises the following steps: mixing a lithium amide waste material, a lithium sulfide waste material and water, then mixing with a hydrogen peroxide solution and a sulfuric acid solution, and carrying out an acid dissolution reaction to obtain a lithium-containing acid solution and an insoluble substance; mixing the lithium-containing acid solution with alkali liquor, and carrying out alkalization reaction to obtain insoluble impurities and alkalized feed liquid; concentrating the alkalized feed liquid to obtain concentrated alkalized feed liquid, and mixing the concentrated alkalized feed liquid with a sodium carbonate solution for lithium precipitation reaction to obtain lithium precipitation mother liquor and lithium carbonate; extracting the lithium element in the lithium precipitation mother liquor, and evaporating and concentrating the raffinate to separate out sodium sulfate and ammonium sulfate; ammonium sulfate and the lithium iron phosphate waste are mixed and then sequentially subjected to roasting and leaching, and a leaching solution and a lithium-containing acid solution are mixed for alkalization. The method has the characteristics of high process integration level, high economic value and less environmental pollution, and conforms to the new concept of chemical green atom economy.

The invention discloses a cross-linking agent for rubber and a preparation method thereof. The preparation method comprises the following steps: S11, dissolving 2, 4-dichlorobenzoic acid in tert-butyl alcohol, and dropwise adding concentrated sulfuric acid to obtain a mixed solution; s12, slowly dropwise adding a hydrogen peroxide solution into the mixed solution, and oxidizing to obtain a primary oxidized solution; s13, carrying out secondary oxidation on the primary oxidation solution obtained in the step S12 to obtain a secondary oxidation solution; and S14, purifying the secondary oxidation liquid obtained in the step S13 to obtain the cross-linking agent for rubber. The application of the cross-linking agent for the rubber in the rubber comprises the following steps: S21, banburying raw materials and the cross-linking agent for the rubber to prepare a rubber material; and S22, feeding the rubber material in the step S21 into a vulcanizing machine, and vulcanizing to obtain the rubber. The prepared cross-linking agent for the rubber is good in performance, the preparation method is simple, emission of three wastes is small, the atom utilization rate is high, and after the cross-linking agent is applied to the rubber, the prepared rubber is good in tensile strength, elongation at break and wear resistance index.

The invention discloses a method for preparing high-purity iron phosphate through low-cost aluminum removal of ferrophosphorus slag obtained after lithium extraction of waste lithium iron phosphate batteries. The method comprises the following steps that S1, the ferrophosphorus slag is subjected to size mixing, a complexing agent and a leaching agent are added, and leaching liquid 1 and leaching slag 1 are obtained after filtering and washing; s2, mixing the leachate 1 with a pH regulator 1, and filtering to obtain molten aluminum and purified ferrophosphorus slag; s3, the purified ferrophosphorus slag is subjected to acid pickling, filtering and washing, and then acid-pickled ferrophosphorus slag is obtained; s4, the leaching residues 1 are subjected to size mixing and stirring washing, and stirring washing residues are obtained; s5, slurry mixing is conducted on the stirring and washing residues, acid is added for dissolution, and leachate 2 and graphite residues are obtained after solid-liquid separation; s5, mixing the acid pickling ferrophosphorus slag with the leachate 2, and filtering to obtain regenerated ferrophosphorus liquid; and S6, a pH regulator 2 is added into the regenerated ferrophosphorus liquid, a regenerated iron phosphate product is obtained through synthesis, conversion and roasting, and efficient removal of aluminum impurities in the leachate is achieved under the conditions of short process and less acid through the processes of adding a complexing agent for acid leaching, precipitating, dissolving and the like.

The invention relates to the technical field of rare earth hydrometallurgy and rare earth smelting separation, in particular to a green and efficient defluorination process for carbonate ore rare earth feed liquid. The technical problems that in the prior art, due to the fact that the fluorine content in primary liquid of an acid dissolution procedure needs to be strictly controlled, three phases can be extracted, operation of a tank body is affected, the productivity is reduced, and products are unqualified are solved. According to the technical scheme, the green and efficient fluoride removal process for the carbonate ore rare earth feed liquid comprises the following steps: step 1, modifying aluminum oxide; step 2, acid dissolution; step 3, adsorbing and removing fluorine; 4, removing fluorine by using a filter column; step 5, washing process; and step 6, regeneration. In the whole technological process, the loss of aluminum oxide is low, the aluminum oxide is regenerated and recycled, new impurities are not introduced, the introduced aluminum can be removed in the pH increasing process, the method is green and efficient, redundant technological steps are not added, and the economic benefit is remarkable.

The invention discloses a rare earth recovery method of ionic rare earth acid-soluble slag, which comprises the following steps: adding water into ionic rare earth concentrate acid-soluble slag for size mixing to obtain mixed slurry; adding a sodium hydroxide solution with the concentration of 50-100g / L into the mixed slurry for alkaline conversion, filtering and washing to obtain first wastewater and an alkaline cake; water is added into the alkali cake for size mixing, alkali cake slurry is obtained, the solid-liquid weight ratio of the alkali cake to the water is 1: (1-2), the alkali cake slurry is heated for acid dissolution, the pH is controlled to be 0.5-1.0, and a rare earth crude product solution is obtained after filtering and water washing; precipitating the rare earth crude product solution with an oxalic acid solution, filtering, and washing to obtain second wastewater and an oxalic acid rare earth mixture; and firing the oxalic acid rare earth mixture at a high temperature to obtain the mixed rare earth oxide. The process is simple in technology, short in flow, less in three wastes, stable and reliable in operation and low in cost, and the rare earth recovery rate reaches 90% or above.

The invention discloses a preparation method of chloroprocaine hydrochloride, and belongs to the technical field of chloroprocaine hydrochloride synthesis. Comprising the following steps: (1) preparing 4-amino-2-chlorobenzoic acid: dissolving 2-chloro-4-nitrobenzoic acid in a solvent, and uniformly stirring; adding a ruthenium catalyst Ru / SNC into the system, and carrying out heat preservation reaction in a hydrogen atmosphere; the 4-amino-2-chlorobenzoic acid is obtained through a reaction; (2) preparation of chloroprocaine hydrochloride: dissolving 4-amino-2-chlorobenzoic acid, 2-chloroethyl diethylamine and a solid base catalyst K / r-GO in a reaction solvent, and carrying out an esterification reaction; the 2-(diethylamino)-2-chlorine-4-nitrobenzoic acid ethyl ester is obtained; and then salifying and drying to obtain the chloroprocaine hydrochloride. The catalyst provided by the invention realizes efficient catalytic reaction at lower temperature and pressure, can be recycled for dozens of times, and is suitable for large-scale industrial production.

The invention relates to the technical field of hydrometallurgy production, and particularly discloses a method for synergistically extracting gallium and scandium by coupling titanium white waste acid with vanadium extraction converter sludge, which comprises the following steps: mixing titanium white waste acid and vanadium extraction converter sludge in proportion, stirring and leaching to obtain a leaching solution; adding an extraction agent and a diluent into the leaching solution for extraction, and washing to obtain a gallium and scandium loaded organic phase; a first stripping agent is added into the loaded organic phase of gallium and scandium for stripping treatment, and a gallium stripping solution and a loaded organic phase of scandium are obtained; sequentially carrying out alkali precipitation, alkali dissolution and electrolytic treatment on the gallium reverse extraction solution to obtain crude gallium; a second stripping agent is added into the scandium-loaded organic phase for stripping treatment, and a scandium precipitation solution and an organic phase solution are obtained; and the scandium precipitation solution is filtered, washed and subjected to acid dissolution, and a scandium-containing solution is obtained. According to the method, the titanium white waste acid is effectively recycled, rare and precious metals in the vanadium extraction converter sludge are efficiently and synergistically extracted, and the method has a relatively good popularization prospect.

To provide a new method in which zinc is collected from a steelmaking dust.SOLUTION: Halogen is removed from a steelmaking dust including zinc and halogen by washing the dust using a cleaning solution. A zinc solution containing the zinc and iron is obtained by dissolving the washed steelmaking dust using an acid. An impurity element contained in the zinc solution is deposited on the surface of the zinc metal by adding the zinc metal to the zinc solution. The iron contained in the zinc solution is deposited as an iron deposit. By electrolyzing the zinc solution with an electrode inside, the zinc contained in the zinc solution is deposited on the surface of the electrode.SELECTED DRAWING: Figure 1

The invention relates to a method for extracting rare earth elements based on a biological separation method, and relates to the technical field of rare earth element separation and extraction. In order to solve the problems of high pollution and poor selectivity of a traditional chemical method and low adsorption capacity, insufficient stability and the like of a biotechnology, the rare earth ion adsorbent is prepared by screening microbial strains or biomolecules with high affinity, utilizing the specific adsorption or metabolic acid production dissolution effect of surface functional groups of the microbial strains or biomolecules on rare earth ions and combining biological material modification and a combined process. And efficient enrichment and selective separation of target elements in low-grade rare earth ore, multi-metal complex ore and rare earth-containing wastewater are realized. According to the technology, key parameter regulation and control are optimized through a process kinetic model, energy consumption and environmental pollution are reduced, meanwhile, the rare earth recovery purity and process stability are improved, and an innovative solution is provided for green and sustainable development of rare earth resources.

The invention discloses lithium slag slurry for concrete, which is prepared from the following components in parts by weight: 50 parts of lithium slag, 35 to 60 parts of water, 0.5 to 1 part of dispersing agent and 0.1 to 0.5 part of stabilizing agent, the lithium slag is modified lithium slag, and a modification method of the lithium slag comprises the following steps: S1, at room temperature, pre-soaking the original lithium slag with water or a dilute acid solution to obtain pre-soaked lithium slag; acid is added into the pre-soaked lithium slag for dissolution treatment, then solid-liquid separation is carried out, and acid dissolution slag and a lithium-rich solution are obtained; the acid is a dilute sulfuric acid solution with the mass percent concentration of 3-10%; and S3, washing the acid dissolution slag at room temperature, and then carrying out solid-liquid separation to obtain modified lithium slag and a dilute acid solution. The lithium slag slurry is prepared from the lithium slag, and the lithium slag is homogenized, so that the quality risk caused by non-uniform distribution of harmful substances in the lithium slag is avoided, the problem of high water demand caused by a porous structure in the lithium slag is solved, and meanwhile, the workability and slump loss resistance of the prepared concrete are improved.

The invention provides a bimetal MOFs three-dimensional biomass composite material and a preparation method and application thereof.The preparation method includes the steps that FeCl2. 4H2O and MnCl2. 4H2O are dissolved in deoxygenized deionized water to obtain a bimetal solution, cotton CF is soaked in the bimetal solution to be fully reacted with metal ions, gallic acid is dissolved in a KOH solution to obtain a gallic acid solution, the gallic acid solution is dissolved in a KOH solution to obtain a mixed solution, and the mixed solution is dried to obtain the bimetal MOFs three-dimensional biomass composite material. Then, a gallic acid solution is added into the bimetallic solution containing the cotton fiber CF, PVP is added, the mixture is stirred and mixed to be uniform, the mixed solution is subjected to a hydrothermal heating reaction, and Fe / MnX-MOFs (at) CF is obtained. According to the method, the ferro-manganese gallate bimetallic MOFs grow on the surface of the plasma-treated cotton fiber in situ through a hydrothermal synthesis method to obtain Fe / Mn3-MOFs (at) CF, the Fe / Mn3-MOFs (at) CF serves as a catalyst to activate H2O2 to generate free radicals, the generated free radicals can attack TC and decompose the TC into small-molecule CO2 and H2O, and meanwhile the good TC removal effect is still achieved under the condition that the pH ranges from 2 to 11. The method has the advantages of being green, environmentally friendly, high in degradation rate, high in removal rate, high in anti-interference capacity, convenient to recycle and the like.

The invention discloses a nickel-iron alloy dissolving method which comprises the following steps: feeding a copper sulfate solution into a mixed feed liquid containing a first nickel-iron alloy and copper sulfate, carrying out primary replacement reaction to obtain copper-containing slag and a reaction liquid, maintaining c (Fe < 2 + >) / c (Cu < 2 + >) in the reaction liquid to be 50-90, and overflowing to obtain a nickel-iron-copper solution; wherein c (Fe < 2 + >) and c (Cu < 2 + >) are mass concentrations of Fe < 2 + > and Cu < 2 + > respectively, and the unit is g / L; and carrying out secondary replacement reaction on the nickel-iron-copper solution and a second nickel-iron alloy until the concentration of Cu < 2 + > in a liquid phase is lower than 5ppm, and carrying out solid-liquid separation to obtain a nickel-iron solution product and second copper-containing slag. According to the dissolving method of the ferro-nickel alloy, the recovery process of ferro-nickel in the ferro-nickel alloy can be simplified, the quality of the ferro-nickel solution is improved, the gas production phenomenon caused by acid dissolution is avoided, and the safety is higher.

The invention discloses a method for enriching and recovering platinum group metal in a waste catalyst by using carbonylation alloy, which comprises the following steps: uniformly mixing nickel-copper-containing carbonylation alloy as a trapping agent with a waste catalyst (automobile exhaust ternary, medical catalyst and the like), a slag former, a fluxing agent and a reducing agent according to a ratio, and melting at high temperature; nickel-copper-based alloy rich in precious metal can be obtained after slag sulfonium separation, and then the purposes of separation of precious metal and base metal and re-enrichment of the precious metal are achieved through acid dissolution. A traditional iron matte trapping and lead matte trapping method is abandoned, a slag matte trapping method is adopted, the slag type is stable, the content of precious metal in slag is low, the enrichment and recovery rate of the precious metal is high, precious metal alloy enrichment is easy to treat, and the cost is low; the method is free of heavy metal pollution, wide in application field and suitable for industrial production.

The invention provides a gold ore phase analysis method, and belongs to the field of mineral analys.The gold ore phase analysis method comprises the steps that a gold ore sample is prepared into ore pulp, the pH value is adjusted to 10-11, ultrasonic cavitation treatment is conducted after polyethylene glycol is added, and limonite turbid liquid and sedimentation bottom mud are obtained through separation; the turbid liquid is subjected to flocculation precipitation, drying, roasting, acid dissolution and impurity removal, and the limonite gold-loaded grade is obtained through the mass difference before and after dissolution and gold concentration determination; separating metal sulfide ore heavy minerals and gangue minerals from the settled bottom mud through artificial heavy elutriation, performing acid dissolution and impurity removal on the metal sulfide heavy minerals, and calculating the gold loading grade of the metal sulfide heavy minerals through mass difference and gold concentration determination; after gangue minerals are subjected to oxidizing roasting, the gold content is measured after concentrated acid dissolution; and calculating the distribution rate of gold based on the result. The gold loading grade and distribution of the limonite phase, the metal sulfide ore phase and the gangue mineral phase are measured in a split-phase mode, the method is highly matched with the gold ore development process, operation is easy and convenient, the result is reliable, and beneficiation and metallurgy technological process formulation and technical index pre-judgment can be effectively served.

The invention belongs to the field of hydrometallurgy, and particularly provides an ionic type rare earth ore leachate composite precipitation treatment method which comprises the steps that magnesium oxide is adopted for one-step precipitation of rare earth leachate, and rare earth and impurities are co-precipitated to form an enriched product; carrying out acid dissolution treatment on the rare earth enrichment, carrying out solid-liquid separation to obtain filter residues, using the filter residues for mining and covering soil, neutralizing and removing impurities from the filtrate by adopting magnesium oxide or the rare earth enrichment, adjusting the pH value of one part of the filtrate after impurity removal by adopting magnesium oxide, and sufficiently aging to serve as a precipitator for later use; the pH of the other part is adjusted by the precipitator, and then sodium bicarbonate or sodium hydroxide composite precipitation is adopted to recover the rare earth. The treatment method provided by the invention effectively solves the problems of high content of silicon, aluminum, sulfur and magnesium impurities and low total amount of rare earth in a rare earth enriched product when rare earth is recovered by a single precipitator, and poor crystallization, slow sedimentation, difficult filtration, high rare earth loss and the like of a rare earth carbonate product during traditional sodium bicarbonate precipitation, and realizes mining and smelting cyclic utilization of magnesium resources; and the overall development and utilization efficiency of the ionic rare earth ore is improved.

The invention discloses a precipitation separation and purification method for metals in gallium-containing wastes. The method comprises the following steps: firstly, dissolving the waste containing gallium, indium and tin with acid, then adding alkali liquor, and adjusting the pH value of the solution twice to respectively obtain a precipitate containing tin, a precipitate containing gallium and indium and a solution containing zinc; after the sediment stands for a period of time, slurry is added for filtering, obtained filter residues return to a slurry barrel, obtained tin-containing filtrate is used for preparing a high-purity tin product, obtained gallium and indium-containing filtrate is extracted with an extracting agent mainly comprising tributyl phosphate or trioctyl / decyl alkyl tertiary amine and the like, high-purity gallium is obtained in an organic phase, and high-purity indium is obtained in raffinate. According to the method, separation and purification of gallium, indium, tin and zinc are achieved through two-time precipitation and two-time filtration. Precipitation operation is simple, a precipitant is cheap and easy to obtain, and the separation method is low in cost.

The invention discloses a method for accurately measuring trace calcium in high-purity magnesium metal by combining membrane desolvation and triple quadrupole mass spectrometry, which comprises the following steps: (1) sequentially adding water to wet a high-purity magnesium sample and adding acid to dissolve the sample to obtain a digestion solution, and adding an internal standard solution into the digestion solution; (2) preparing calcium element solutions with multiple concentration gradients, adding the internal standard solution, fixing the volume, and shaking uniformly; (3) sequentially carrying out atomization treatment and membrane desolvation treatment on the prepared solution to respectively obtain dry aerosol of the to-be-detected solution and the standard solution; and (4) carrying out scanning determination on the dry aerosol of the solution to be detected and the standard solution in the step (3) by using a triple quadrupole mass spectrometer, and calculating to obtain the calcium content in the high-purity magnesium sample. According to the method, the 24Mg16O polyatomic interference brought by the matrix element and the mass spectrum interference of the working gas Ar on the to-be-detected element 40Ca are removed through membrane desolvation and triple quadrupole mass spectrometry, so that the trace calcium element in the high-purity magnesium sample can be accurately determined, and the lower determination limit can reach ppb level.

The invention relates to an acid-soluble water-swelling gel plugging agent as well as a preparation method and application thereof. The acid-soluble and water-swelling gel plugging agent disclosed by the invention is prepared by polymerizing the following raw materials in parts by weight: 15 to 25 parts of carboxymethyl cellulose, 20 to 40 parts of N, N-dimethylacrylamide, 15 to 30 parts of dimethyl diallyl ammonium chloride and 10 to 35 parts of sodium p-styrenesulfonate. The plugging agent disclosed by the invention can resist high temperature and high pressure, also has high water absorption and salt resistance, is high in acid solubility, fully ensures smooth proceeding of plugging work, avoids damage to a stratum, and is beneficial to proceeding of plugging removal work in the later period. The invention further provides a preparation method and application of the acid-soluble water-absorbing expansible gel plugging agent, the preparation process is simple, the requirement for professional knowledge of operators is low, no special requirement for use equipment exists, the production stability is good, all the raw materials are commercially available, the source is wide, the price is low, and large-scale industrial production is easy to achieve.

The invention discloses a steel cylinder cleaning method. The method comprises the steps that ethyl alcohol is injected into a steel cylinder; rolling the steel cylinder filled with the ethanol for multiple times to rinse the inner wall of the steel cylinder, and then emptying the ethanol in the steel cylinder; injecting ultrapure water into the steel cylinder cleaned by the ethanol; rolling the steel cylinder filled with the ultrapure water for multiple times, rinsing the inner wall of the steel cylinder, and then emptying the ultrapure water in the steel cylinder; nitric acid is injected into the steel cylinder cleaned by the ultrapure water, metal ions in the steel cylinder are dissolved, and then the nitric acid in the steel cylinder is emptied; injecting ultrapure water into the steel cylinder to rinse the steel cylinder, and emptying the ultrapure water in the steel cylinder; taking the discharged ultrapure water as a sample, and detecting the content of residual metal ions in the steel cylinder; according to the obtained metal ion content, whether the steel cylinder meets the cleanliness requirement or not is judged, if the cleanliness requirement is met, a small amount of nitric acid is added into the steel cylinder, sampling detection is conducted after the steel cylinder is moistened and washed, and if the test result is consistent with the previous metal ion content, the steel cylinder is clean. According to the steel cylinder cleaning method, external source introduction is avoided while metal ion impurities in the steel cylinder are treated.

The invention relates to an environment-friendly platinum group noble metal slag analysis method which comprises the following steps: S1, sampling: sampling a sample to a cremation cup, and synchronously performing compensation analysis; s2, stirring: uniformly stirred reagents are added into the sample, the reagents comprise anhydrous sodium carbonate, borax, silicon dioxide, soluble starch, calcium fluoride, copper alloy and a covering agent, and a mixture is obtained; s3, melting is conducted, specifically, the mixture is completely melted and then poured into a casting mold to be cooled, and a copper buckle is formed; s4, acid dissolution: cleaning out the copper buckle in the cremation cup, dissolving the copper buckle in concentrated nitric acid, and filtering out residual metal slag; and S5, weighing: drying and weighing the metal slag, and calculating the content of the metal slag in the sample. The method belongs to a fire assaying treatment method and has the advantage of simple operation, but lead oxide is replaced by copper alloy, the toxicity of reagents is effectively reduced, and the treatment is more environment-friendly.

The invention belongs to the technical field of geological sample analysis and detection, and particularly discloses a method for measuring the amount of each element of lithium ore in a closed acid-soluble system, and the method comprises the following steps: pretreating the lithium ore; the pretreated lithium ore is weighed and put into a closed sample dissolving device, hydrofluoric acid and purified nitric acid are sequentially added, and the closed sample dissolving device is closed; carrying out heat preservation on the closed sample dissolving device twice to obtain a test solution; and measuring the test solution by using an inductively coupled plasma mass spectrometer to obtain a working curve, and calculating the content of the analysis element in the sample solution by using the working curve. The method for determining the amount of each element in the lithium ore by adopting the closed acid-soluble system has the characteristics of simplicity in operation, high efficiency and good stability, realizes simultaneous determination of the amount of lithium, rubidium, cesium, beryllium, strontium, niobium, tantalum, zirconium, hafnium and rare earth elements in the large-batch lithium ore, and further provides a reference for determination of main trace elements in the lithium ore.

The invention provides a method for preparing a low-aluminum titanium-doped iron phosphate material by utilizing ferrophosphorus slag, which comprises the following steps: S1, crushing the ferrophosphorus slag, and dissolving the crushed ferrophosphorus slag in an acid solution to prepare a primary leaching solution; s2, acid is continuously added into the leaching residues for dissolution, and secondary leaching liquid is prepared; s3, adding an alkaline substance into the primary leachate to obtain an iron-phosphorus mixture; s4, mixing the secondary leachate with an iron-phosphorus mixture; s5, preparing a yellow material; s6, pulping the yellow material, and adding a phosphoric acid solution to obtain the yellow material; s7, the yellow material is heated and then subjected to heat preservation; s8, naturally cooling, filtering, washing and dehydrating to obtain iron phosphate dihydrate; and S9, drying the dehydrated iron phosphate dihydrate in a drying oven, and calcining to obtain the low-aluminum titanium-doped anhydrous iron phosphate. The titanium element in the iron-phosphorus adjusting liquid is doped into the iron phosphate material, so that the crystal structure and the performance of the iron phosphate material are optimized, the preparation process is simplified, and the titanium doping cost is reduced.

The invention provides a method for treating waste water containing fluorine and aluminum, which comprises the following steps: S1, first treatment: reacting a first mixed solution, and carrying out solid-liquid separation to obtain a first treated solution and first treated slag; wherein the first mixed solution comprises waste water containing fluorine and aluminum and ammonia water, and the pH value of the first mixed solution is 7-8; s2, second treatment, wherein the second treatment comprises the steps S2'and S2 ''; s2 ', the first treatment slag and a hydrofluoric acid solution are mixed for acid dissolution, and an acid solution is obtained; mixing an acid solution and sodium fluoride, and carrying out precipitation treatment to obtain cryolite; s2 '', mixing the first treatment liquid with calcium chloride, performing defluorination treatment, and performing solid-liquid separation to obtain calcium fluoride and defluorination waste liquid. By the treatment method, cryolite with high yield and high purity can be prepared, and meanwhile, the low-aluminum and low-fluorine discharge requirements can be met.

The invention discloses a method for treating red mud by using waste sulfuric acid, which comprises the following steps: mixing waste sulfuric acid and red mud, placing the mixture in a double-chamber electrochemical reaction system, breaking the silicate structure of the red mud in an anode chamber through 0.8-1.0 V voltage, and introducing acidithiobacillus acidophilus for metabolism to generate oxalic acid and citric acid to dissolve iron and aluminum oxides; the extracellular polymer fixes heavy metal ions to reduce the leaching toxicity by 90%, a cathode chamber is blocked by an ion exchange membrane to recycle more than 85% of waste acid, step-by-step precipitation of Fe < 3 + >, Al < 3 + > and Ca < 2 + > is realized by regulating and controlling the pH gradient in stages, goethite with the magnetic separation purity being greater than or equal to 95% and aluminum gel are used as functional materials, and 99% high-purity gypsum is generated through induction of nanocrystalline seeds. According to the method, 95% of iron recovery rate and heavy metal stabilization in the red mud are achieved, the waste acid recycling rate reaches 85%, the method has the advantages of low energy consumption and recycling, the treatment cost is reduced by 50% or above compared with a traditional method, and an efficient solution is provided for cooperative treatment of the red mud and the waste acid.

The invention discloses a synthesis method of 5-nitrotetrazole sodium salt, and solves the problem of relatively large potential safety hazard in the synthesis process of 5-nitrotetrazole sodium in the prior art. The method for safely preparing the high-energy compound 5-nitrotetrazole sodium salt based on DAT comprises the following steps: adding 1, 5-diamino tetrazole into a certain amount of ice water and acid to dissolve 1, 5-diamino tetrazole; slowly dropwise adding a sodium nitrite solution into the ice-water mixture solution, and uniformly stirring at a certain temperature; slowly heating the mixture to a certain temperature, and reacting for a period of time to obtain filtrate; removing filtrate to obtain white powder; and dissolving the obtained white powder in acetone, filtering to obtain a solution, and removing the solvent to obtain the 5-nitrotetrazole sodium salt. The preparation method provided by the invention is simple, safe and mild in reaction condition; water is used as a solvent, so that environmental pollution is avoided, and environmental protection requirements are completely met; and dangerous intermediates such as tetrazole-5 diazonium salt and 5nitrotetrazole acid copper salt are not generated.

The invention provides a method for recovering scandium from scandium-containing lithium slag and a pretreatment method of the scandium-containing lithium slag. The method for recovering scandium from the scandium-containing lithium slag comprises the following steps: mixing the scandium-containing lithium slag with concentrated sulfuric acid, and heating and roasting to obtain a roasted product; the roasted product is subjected to water leaching, and scandium-containing leaching liquid and leaching residues are obtained; the scandium-containing leachate is extracted, and a scandium-containing organic phase and raffinate are obtained; washing the scandium-containing organic phase to obtain a purified scandium-containing organic phase and a washing solution; carrying out reverse extraction on the purified scandium-containing organic phase, and filtering to obtain a reverse extract; the reverse extract is subjected to acid dissolution, and a scandium-containing acid solution is obtained; adding oxalic acid into the scandium-containing acid solution for precipitation, filtering to obtain scandium oxalate precipitation, and roasting to obtain scandium oxide.