10715 results about "Sulfuric acid" 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 high-purity hafnium oxide and a preparation method thereof, and relates to the technical field of hydrometallurgy. The preparation method of the high-purity hafnium oxide comprises the following steps: crushing a hafnium oxide raw material to obtain hafnium oxide powder; sequentially carrying out alkali fusion, water immersion and filtration treatment on the hafnium oxide powder to obtain a hafnium hydroxide filter cake; dissolving the hafnium hydroxide filter cake in a sulfuric acid solution to obtain a hafnium sulfate solution; adding sodium sulfate into the hafnium sulfate solution to obtain hafnium-containing double salt; dissolving the hafnium-containing double salt in a sulfuric acid solution, heating, evaporating, cooling and crystallizing to obtain hafnium sulfate crystals; dissolving the hafnium sulfate crystal in concentrated hydrochloric acid to obtain a hafnium oxychloride solution, heating, evaporating, cooling and crystallizing to obtain a hafnium oxychloride crystal; dissolving the hafnium oxychloride crystal in pure water, adding an oxalic acid solution, and precipitating to obtain hafnium oxalate; and calcining hafnium oxalate to obtain high-purity hafnium oxide. The preparation method of the high-purity hafnium oxide is green, environment-friendly, simple and efficient.

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

The invention discloses a method for removing lead and supplementing nickel from electrodeposited nickel anolyte, which relates to the technical field of nickel wet smelting, is used for purifying and removing lead from anolyte of a pure sulfuric acid system, and comprises the following steps of: adding the electrodeposited anolyte into refined nickel sulfate oil-removed liquid and nickel carbonate slurrying liquid, introducing air, controlling the temperature, and entering an acid dissolution lead removal tank for acid dissolution; and filtering the acid-dissolved solution through an acid dissolution filter press, pumping the obtained primary filtrate into a precision filter, pumping the obtained secondary filtrate into a secondary filtrate storage tank, pumping the secondary filtrate into a catholyte tank through a secondary filtrate delivery pump, and enabling the obtained catholyte as an electrodeposition cell catholyte to enter an electrodeposition process. The method has the advantages of being short in technological process, high in lead removal efficiency, simple and convenient to use, easy to filter, low in energy consumption, capable of recycling the falling solution, convenient for industrial production and the like.

The invention discloses a method for synchronously improving the recovery rate of copper and cobalt in high-oxidation-rate copper-cobalt ore and low-grade copper oxide-cobalt concentrate, which comprises the following steps: (1) carrying out copper sulfide flotation on the high-oxidation-rate copper-cobalt ore to obtain high-copper tailings; (2) the low-grade copper-cobalt concentrate and the high-copper tailings are mixed according to the mass ratio of 1: (1-2), and mixed ore is obtained; (3) the obtained mixed ore and a sulfuric acid solution system leaching agent are stirred and mixed, and slurry is obtained; (4) leaching the obtained slurry at normal temperature, and carrying out solid-liquid separation to obtain leached residues and leached liquid; (5) carrying out washing, extraction, reverse extraction and electrodeposition on the obtained leaching residues to obtain metal copper; and removing iron from the raffinate, and adding magnesium oxide into the iron-removed liquid for precipitation to obtain crude cobalt hydroxide. According to the method, the high-copper tailings and the low-grade copper oxide cobalt concentrate are subjected to the processes of ore blending, size mixing, normal-temperature sulfuric acid leaching and the like, the final copper leaching rate is 95% or above, and the cobalt leaching rate is 70% or above.

The invention discloses a sulfuric acid erosion resistant self-repairing geopolymer system and a self-repairing method thereof, and relates to the technical field of composite materials and artificial intelligence. At least one self-repairing unit optimized for sulfuric acid erosion embedded within the geopolymer matrix; the in-situ multipoint pH sensing network is integrated in the geopolymer matrix and is used for monitoring spatio-temporal evolution data of a pH field in a sulfuric acid erosion process in real time; the edge calculation module is used for identifying a preliminary erosion indication according to the received spatio-temporal evolution data of the pH field; and the central AI decision module is used for evaluating an erosion state and predicting a development trend by utilizing an AI model optimized aiming at sulfuric acid erosion according to the identified preliminary erosion indication and the pH field spatio-temporal evolution data, and generating an optimal repair strategy to control the self-repair unit to perform self-repair. According to the invention, intelligent, active and refined protection and life management of the geopolymer in the sulfuric acid erosion process can be realized.

The invention discloses a preparation method of injectable nano composite hydrogel for relieving osteoarthritis, which comprises the following steps: firstly, synthesizing nano rod-like hydroxyapatite with the length of 150-300 nm and the diameter of 10-15 nm, and the hydroxyapatite is hydrophilic hydroxyapatite doped with strontium and europium ions; the preparation method comprises the following steps: by taking Ca (NO3) 2, Sr (NO3) 2, Eu (NO3) 3 and soluble phosphate as main raw materials, carrying out hydrothermal reaction to prepare strontium and europium ion co-doped hydrophobic hydroxyapatite, dispersing the strontium and europium ion co-doped hydrophobic hydroxyapatite in a Tris-HCl buffer solution, adding tannic acid, stirring, centrifugally collecting precipitate, and drying to obtain strontium and europium ion doped hydrophilic hydroxyapatite; the preparation method comprises the following steps: taking chondroitin sulfate and adipic dihydrazide as main raw materials, stirring, dialyzing, freeze-drying, and dissolving in a buffer solution to obtain the chondroitin sulfate solution grafted with the hydrazide group; the preparation method comprises the following steps: taking hyaluronic acid, 3-aminophenylboronic acid and sodium periodate as main raw materials, stirring, dialyzing, freeze-drying, and dissolving in a buffer solution to obtain the phenylboronic acid group grafted oxidized hyaluronic acid solution; the preparation method comprises the following steps: blending hydrophilic hydroxyapatite doped with strontium and europium ions, a chondroitin sulfate solution grafted with a hydrazide group, an oxidized hyaluronic acid solution grafted with a phenylboronic acid group and a recombinant collagen solution, and stirring to obtain the injectable nano composite hydrogel. The injectable nano composite hydrogel obtained by the invention has good biocompatibility, and a favorable local immune microenvironment can be created to immunomodulate macrophages so as to relieve osteoarthritis and promote subchondral bone repair.

The invention discloses a method for harmlessly treating lithium slag and preparing a water-stable material from the treated lithium slag. The method comprises the following steps: crushing the lithium slag; mixing a sulfuric acid-containing material with the crushed lithium slag to obtain a pulpified mixture; roasting, and carrying out chemical modification to obtain roasted slag; adding a material containing activated aluminum oxide into the roasting slag to obtain a mixed material; the mixed material is subjected to water leaching and filtering, and leaching residues and leaching liquid are obtained; and drying the leaching slag, adding an exciting agent, and grinding to finally obtain the detoxified lithium slag. And preparing the water-stable material from the detoxified lithium slag. Under the condition of effectively improving the quality of the cement-stabilized layer, the lithium slag resource is effectively utilized, the resource utilization rate is improved, and the mechanical strength and corrosion resistance of the cement-stabilized layer concrete can be effectively improved by matching with the exciting agent and the curing agent.

The invention provides a low-cost preparation method of high-performance titanium-doped iron phosphate, and relates to the technical field of batteries. The low-cost preparation method comprises the following steps: S1, respectively preparing a phosphoric acid solution, a hydrogen peroxide solution, a phosphorus salt solution and a ferrite solution; s2, adding titanium sulfate into the ferrite solution to obtain an iron-titanium mixed solution; s3, directly adding ammonia water and a hydrogen peroxide solution into the phosphorus salt solution to obtain a phosphorus-oxygen mixed solution; s4, the iron-titanium mixed solution is heated, the phosphorus-oxygen mixed solution is put into the iron-titanium mixed solution, and slurry A is obtained; s5, obtaining a filter cake A; s6, adding pure water and a phosphoric acid solution, and heating to obtain slurry B; s7, obtaining anhydrous iron phosphate; the synthesized iron phosphate is compact and compact in morphology, internal pore channels of primary particles are still rich, the compaction density of the lithium iron phosphate material obtained through grinding and sintering reaches 2.613 g / cc, the 0.1 C discharge capacity can still reach 156.35 mAh / g, and the 1C discharge capacity reaches 131.47 mAh / g.

The utility model relates to the technical field of sulfuric acid filtering equipment, and discloses a refined sulfuric acid filter which comprises a filter tank body, a discharge pipe fixedly mounted at the lower end of the filter tank body, a feed pipe fixedly mounted on the outer side of the filter tank body, and a pressure gauge fixedly mounted on the filter tank body above the feed pipe, a safety valve is further fixedly installed at the position, above the pressure gauge, of the filter tank body, a top cover is fixedly installed on the filter tank body, two pore plates are fixedly installed in the filter tank body, a plurality of filter elements are fixedly installed between the two pore plates, and a lifting plate is movably connected between the filter elements. The lifting plate is arranged among the filter elements, the sleeve holes are formed in the inner side of the lifting plate, the arc-shaped scrapers which are arranged in a staggered mode are arranged on the inner sides of the sleeve holes, and elastic supporting of the inserting rings and the arc-shaped supporting mechanisms is matched, so that adhesion layers on the outer surfaces of the filter elements can be automatically cleaned by means of high-low changes of the liquid level of a medium in the filter tank body; the filtering effect of the filter element is improved and the service life of the filter element is prolonged.

The invention relates to the technical field of solid waste treatment, in particular to a flotation method and system for waste incineration fly ash decontamination and calcium conservation. The method comprises the steps that waste incineration fly ash is placed in a natural environment to be subjected to a natural carbonation reaction till the pH value is 7-9, pretreated fly ash is obtained and mixed with water, and then a collecting agent and a foaming agent are added for flotation separation; or mixing the waste fly ash by using the sulfuric acid aqueous solution as the flotation liquid, and then adding the collecting agent and the foaming agent for flotation separation; wherein the collecting agent is one or more of butyl xanthate, ammonium dibutyl dithiophosphate and N, N-diethyldithiocarbamate. By means of the method, heavy metal and chlorine salt in the fly ash can be removed, Ca-based components in the fly ash can be reserved, and therefore resource utilization of the waste incineration fly ash is achieved to the maximum extent.

The invention discloses composite modified pig manure and sludge biochar, relates to the technical field of modified biochar, and mainly comprises pig manure and sludge. The invention also provides a preparation method of the compound modified pig manure and sludge biochar, pig manure and sludge are mixed and pyrolyzed to prepare the pig manure and sludge biochar, and the pig manure and sludge biochar is modified by sulfuric acid and a magnesium chloride solution to prepare the compound modified pig manure and sludge biochar. According to the composite modified pig manure and sludge biochar provided by the invention, pig manure and sludge are subjected to carbonization modification through a composite modification technology, so that heavy metal cadmium pollution is efficiently removed, and meanwhile, a new way is provided for resource utilization of organic wastes.

The invention relates to the technical field of sodium ion battery research and development, and particularly discloses a strong-oxidizing acidified asphalt-based hard carbon negative electrode material and a preparation method and application thereof, concentrated nitric acid or concentrated sulfuric acid is introduced into asphalt as a cross-linking agent, so that the cross-linking reaction among molecules can be promoted under a low-temperature condition, and the structural stability of the material is greatly improved. Compared with a traditional method, the method has the advantages that the technological process is simplified, only one-step pretreatment is needed before carbonization, and energy consumption and pollution caused by high temperature can be avoided. According to the liquid phase cross-linking strategy, through reconstruction of chemical bonds, the low-softening-point asphalt can form a more compact carbon precursor network structure at low temperature, and formation of a high-performance hard carbon material in the subsequent carbonization process is facilitated.

The invention discloses a method for preparing battery-grade iron phosphate and lithium carbonate from a waste lithium iron phosphate battery, and belongs to the technical field of lithium batteries, the method comprises the following steps: slurrying a waste lithium iron phosphate positive electrode material, adding concentrated sulfuric acid for leaching, adding sodium sulfite, controlling reaction potential, and carrying out filter pressing after reaction to obtain a leachate; iron is added into the leachate to remove copper, and copper-removed liquid and copper slag are obtained after filter pressing; adding sodium dihydrogen phosphate into the copper-removed liquid to remove aluminum, and carrying out filter pressing to obtain aluminum slag and impurity-removed liquid; adjusting the pH value of the impurity-removed solution, adding hydrogen peroxide, reacting to obtain an iron phosphate dehydrate precipitate and an iron phosphate mother solution, and treating the iron phosphate dehydrate to obtain battery-grade anhydrous iron phosphate; adjusting the pH value of the iron phosphate mother liquor, carrying out filter pressing to obtain impurity-removed slag and a lithium sulfate solution, adding sodium carbonate into the lithium sulfate solution, carrying out heating reaction, filtering slurry to obtain a lithium carbonate wet material, and treating to obtain battery-grade lithium carbonate. According to the method, the problem of recycling the waste lithium iron phosphate battery material iron phosphate is solved, and comprehensive recycling of the iron phosphate and the lithium material is realized.

The invention provides a preparation method of a semiconductor structure and the semiconductor structure, and particularly relates to the technical field of semiconductors. The preparation method of the semiconductor structure comprises the following steps: providing an initial semiconductor structure, wherein a metal layer is deposited on the initial semiconductor structure; performing first annealing treatment on the metal layer to generate a metal silicon compound; processing the initial semiconductor structure by using a first cleaning solution, wherein the first cleaning solution is a mixed solution of sulfuric acid, hydrogen peroxide and ferrous ions; processing the initial semiconductor structure by using a second cleaning solution, wherein the second cleaning solution is a mixed solution of hydrochloric acid, hydrogen peroxide and water; and performing second annealing treatment on the metal silicon compound to generate a self-aligned silicide layer. By adopting the preparation method of the semiconductor structure, the removal temperature of the unreacted metal layer can be reduced, the influence and damage of high temperature on the thermal stability of the metal silicon compound are avoided, and the product yield is improved.

The invention relates to the technical field of catalyst preparation, and discloses a vanadium-based catalyst and a preparation method and application thereof. The vanadium-based catalyst comprises modified diatomite, an active component and an auxiliary active component, wherein the active component and the auxiliary active component are loaded on the modified diatomite; wherein the content of crystalline SiO2 in the modified diatomite is not less than 90%, the active component comprises vanadium pentoxide, and the auxiliary active component comprises potassium sulfate. The vanadium-based catalyst is an anti-resistance vanadium-based catalyst, the filling amount of the catalyst is small, and the filling amount of the catalyst can be reduced by 35% on the premise that the same performance is achieved, so that the pressure drop of a sulfuric acid device is greatly reduced, the total conversion rate of SO2 is guaranteed, and the method is particularly suitable for a production device for preparing sulfuric acid through waste acid cracking with high raw material gas impurity content; and the method has great advantages on long-period operation.

The invention relates to the technical field of heat-conducting graphite materials, in particular to a POD precursor film, a POD-based graphite film and a preparation method of the POD precursor film, the POD-based graphite film and the preparation method of the POD precursor film. After the reaction is finished, obtaining an antioxidant modified aromatic polyoxadiazole polymer solution; the preparation method comprises the following steps: coating an antioxidant modified aromatic polyoxadiazole polymer solution with a wiped film, then carrying out solidification forming in a multi-stage coagulation bath, and finally neutralizing, washing and drying to obtain a POD precursor film; the coagulating bath is an aqueous solution of sulfuric acid and boron compounds and an aqueous solution of sulfuric acid. And carrying out carbonization treatment and graphitization treatment on the POD precursor film to obtain the POD-based graphite film. According to the preparation method, the boron element is cooperatively introduced into and out of the POD precursor film, so that the oxidation resistance of the graphite film is remarkably improved while the high thermal conductivity is maintained.

The invention provides a process for recovering various valuable elements such as lead, zinc, silver and potassium from soot of a steel mill. The process comprises the following steps of water leaching, fluorine removal, high-temperature concentration, primary cooling crystallization, secondary cooling crystallization, secondary leaching, ammonia leaching and ammonia distillation. According to the recovery process, potassium in the soot of the steel mill is recovered in the form of potassium chloride, zinc is recovered in the form of zinc sulfate, silver is recovered in the form of silver chloride, only auxiliary materials such as sulfuric acid, ammonia water and calcium chloride which are low in price are used in the whole recovery process, the cost is low, no waste water or waste residues are generated in the whole process, the direct recovery rate of lead and zinc is 95% or above, and the production cost is low. The direct recovery rate of silver is 98% or above, and the method has practical application value.

The invention discloses a film coating agent for accelerating stabilization of a weathering resistant steel rust layer in a severe atmospheric environment. The film coating agent comprises a film-forming agent and a spraying agent, the film-forming agent comprises a gel agent and a transforming agent; the gel is prepared from one or more of tannic acid, carbomer, chitosan and gelatin; the transforming agent comprises one or more of magnesium sulfate, zinc sulfate and sodium molybdate; the spraying agent comprises an accelerant and an aggressive agent; the accelerant comprises one or more of sodium sulfate, potassium sulfate and chromium sulfate; the aggressive agent comprises one or more of sodium chloride, aluminum chloride and sodium fluoride. The film coating agent provided by the invention can form a stable and uniform rust layer on the surface of the weathering resistant steel, so that the corrosion resistance of the weathering resistant steel is improved.

The invention provides a method for preparing VOSO4 electrolyte through gas enhanced reduction and reverse extraction, which comprises the following steps: adding an extraction inhibitor into an acidic vanadium-containing solution, stirring and reacting to obtain a vanadium-containing solution, the extraction inhibitor being phosphoric acid and / or a phosphoric acid compound; adjusting the pH value of the solution to 0.5-3.0 by using sulfuric acid, mixing with an organic phase, extracting, and separating liquid to obtain a vanadium-loaded organic phase; washing the vanadium-loaded organic phase with dilute sulfuric acid; a stripping agent and the vanadium-loaded organic phase are mixed for stripping, meanwhile, gas is introduced for strengthening the stripping process, and a no-load organic phase and a vanadium electrolyte are obtained; and the vanadium strip liquor is subjected to galvanic pile electrolysis adjustment, and the vanadium electrolyte with the valence state meeting the standard is obtained. The invention provides a novel process for directly preparing the vanadyl sulfate electrolyte through gas reinforced reduction, and the novel process has the advantages of being simple in process, easy to operate, low in cost and environmentally friendly.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

An advanced defluoridation agent and a method for removing fluoride ion in fluorine-containing wastewater are provided. The advanced defluoridation agent includes 40-70wt% of polyaluminum sulfate, 0.3-30wt% of hydroxyapatite and deionized water supplemented to 100wt%. Using the advanced defluoridation agent of the present disclosure to treat fluoride-containing wastewater can achieve increased defluorination efficiency, reduced electrical conductivity, and reduced sludge content, and a better defluorination effect. The concentration of fluoride ions is lower than 15ppm after using the advanced defluoridation agent of the present disclosure.

The invention relates to the technical field of chemical materials, in particular to a para-aramid aerogel fiber and a preparation method thereof.The preparation method comprises the steps that S1, para-aramid polymer and silicon dioxide aerogel are dissolved and mixed in concentrated sulfuric acid, and a para-aramid spinning solution is obtained; the weight ratio of the para-aramid polymer to the silicon dioxide aerogel is 1: (0.01-0.05). S2, preparing para-aramid nascent fibers from the para-aramid spinning solution through dry jet wet spinning; and S3, replacing the para-aramid nascent fiber in an alkali solution, washing, and freeze-drying to obtain the para-aramid aerogel fiber. According to the preparation method, the para-aramid aerogel fiber is prepared in an inorganic compounding mode, the problem that an aerogel structure cannot be achieved due to the fact that para-aramid is high in strength, high in modulus and compact in molecular chain is solved, and the prepared para-aramid fiber aerogel is high in strength and capable of achieving flexible weaving performance.

The invention belongs to the technical field of laser processing, and provides a quartz crystal etching solution which comprises the following components in volume concentration: 10-30% of hydrofluoric acid, 1-5% of sulfuric acid, 0.1-0.3% of surfactant and the balance of water. By optimizing the proportion, the manufacturing precision and the production and manufacturing efficiency of the tuning fork wafer are improved. And the stable etching rate and the optimal etching surface are obtained, and meanwhile, the cost is saved for process replacement. The invention further provides a method for cutting the tuning fork of the quartz crystal through the laser. The method comprises the steps that S1, the cutting contour line of the tuning fork is preset on the quartz crystal; s2, performing laser cutting on the quartz crystal based on a preset cutting contour line, and forming a tuning fork contour on the quartz crystal; and S3, integrally soaking the quartz crystal in the quartz crystal etching solution, and separating out the tuning fork. The machining process of the quartz crystal tuning fork is simplified, the cutting quality is optimized, the method is suitable for the large-piece manufacturing process, and the cutting efficiency and the yield are greatly improved.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention relates to the technical field of water treatment agent preparation and environmental governance material processing, in particular to polymeric ferric sulfate and a preparation method thereof.The preparation method comprises the steps that steam condensation recycled water of a thermal power plant of an aluminum factory is mixed with ferrous sulfate and concentrated sulfuric acid to form a reaction solution, oxygen is introduced for an oxidative polymerization reaction, and a liquid intermediate is generated; gradient cooling is carried out on the liquid intermediate to control the molar ratio of ferric ions to hydroxyl, and a porous solid precursor is formed through concentration and closed aging; crushing the precursor, performing graded drying by adopting a rotary kiln and flash drying, and synchronously spraying a hydrophobic modifier to reduce the surface hydroxyl activity; the powdery product is secondarily dried in a nitrogen inert environment, and moisture absorption and agglomeration are inhibited. The invention solves the problems of mixed crystal forms, delayed release of effective components and secondary pollution in the traditional process. The obtained product is uniform in crystal form, concentrated in particle size distribution, remarkably improved in dissolution rate and storage stability, and suitable for black and odorous water body treatment and industrial sewage treatment.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for separating metal molybdenum and rhenium from a nickel-based superalloy electrochemical dissolving solution, which comprises the following steps: providing the nickel-based superalloy electrochemical dissolving solution, and adjusting the pH value to 0-1.5; the modified MTS9570 resin is used for adsorbing the nickel-based superalloy electrochemical dissolving solution to obtain a molybdenum-absorbed solution, then a sulfuric acid solution is used for leaching, then an ammonia water solution is used for desorption, and a molybdenum desorption solution is obtained; adjusting the pH value of the molybdenum-absorbed solution to 0.5-1.5, adsorbing with modified MTA1721 resin, leaching with a sulfuric acid solution, desorbing with an ammonium sulfate and ammonia water mixed solution, and desorbing with an ammonia water solution to obtain a second-stage rhenium desorption solution; and the molybdenum desorption solution and the second-stage rhenium desorption solution are subjected to evaporation concentration, crystallization, recrystallization and high-temperature hydrogen reduction respectively, and metal molybdenum and rhenium are obtained. According to the method for separating rhenium and molybdenum from the nickel-based high-temperature alloy electrochemical dissolving solution, the rhenium and molybdenum recovery rate and rhenium purity are improved, and the process is simple, convenient and practical.

An advanced defluoridation agent and a method for removing fluoride ions in fluorine-containing wastewater are provided. The advanced defluoridation agent includes 40-70 wt % of polyaluminum sulfate, 0.3-30 wt % of hydroxyapatite and deionized water supplemented to 100 wt %. Using the advanced defluoridation agent of the present disclosure to treat fluoride-containing wastewater can achieve increased defluorination efficiency, reduced electrical conductivity, and reduced sludge content, and a better defluorination effect. The concentration of fluoride ions is lower than 15 ppm after using the advanced defluoridation agent of the present disclosure.

The invention discloses an SBS modifier and a preparation method and application thereof, an asphalt coating material composition and a preparation method thereof, and a waterproof coiled material. The preparation method of the SBS modifier comprises the following steps: dissolving SBS in a first solvent to obtain an SBS solution; the method comprises the following steps: adding a sulfydryl compound into an SBS solution, and carrying out solution graft polymerization at 50-90 DEG C to obtain graft modified SBS which is grafted with alkyl containing any one of hydroxyl and carboxyl through sulfydryl, or grafted with sulfydryl and grafted with hydroxyl substituted or unsubstituted alkyl through sulfydryl; adding the biomass carbon aerogel and the graft modified SBS into a second solvent according to a mass ratio of 1: (0.5-1.5) to obtain a first mixed solution; adding concentrated sulfuric acid and sodium hypophosphite into the first mixed solution, and reacting at the temperature of 120-130 DEG C to obtain the SBS modifier. According to the preparation method of the SBS modifier, the polarity of the SBS is changed through sulfydryl grafting of the SBS, namely the polarity of the SBS is closer to that of asphalt; and the grafted modified SBS reacts with the biomass carbon aerogel to form a macromolecular compound, so that the performance degradation in the aging process of the coiled material is prevented.

The invention relates to the technical field of waste catalyst recovery, and particularly discloses a method for recovering valuable metals from a waste catalyst containing vanadium and molybdenum. Comprising the following steps: S1, heating and roasting the waste catalyst containing vanadium and molybdenum, continuously heating and roasting, and cooling to obtain a roasted material; s2, mixing the roasted material with a sulfuric acid solution A containing oxalic acid, and heating and leaching to obtain a leaching solution A and a residue A; mixing the residue A with a sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating, carrying out secondary leaching to obtain a leaching solution B and a residue B, and washing the residue B with an acid solution to obtain a washing solution; combining the leaching solution and the washing solution to obtain a combined solution; s3, adjusting the pH value of the mixed solution to 2.5-3, then adjusting the pH value to 4.5-5, adding a dimethylglyoxime alcohol solution, and heating to obtain a purified solution; uniformly mixing the purified liquid with the extraction liquid to obtain an organic phase containing vanadium and molybdenum; and S4, reverse extraction and product preparation. The ammonium molybdate and the vanadium pentoxide obtained in the invention have high purity, and the recovery rate of vanadium and molybdenum is high.