1959 results about "Sulfate" patented technology

The invention discloses a mine water recharge reservoir scaling trend prediction, scale removal and permeation enhancement method, and the trend prediction method comprises the steps: carrying out the conventional physicochemical index analysis of the water quality of mine water and a monitoring well according to the hydrogeological information of a recharge reservoir, and calculating the scaling trend of the mine water recharge reservoir based on a Retino index method and the relative saturation R.S. The scaling conditions of carbonate, sulfate and silicate are rapidly judged respectively; when scaling occurs, the ion concentration change on a path is revealed through a Transport module and an Equilibrium Phases module in the PHREEQC software, and verification is carried out through a measured value of a monitoring well; and then according to the mineral dissolution precipitation reaction and the percentage of the reservoir rock sample composition, calculating the reaction dose and the void ratio so as to formulate a mine water recharge reservoir permeation enhancement optimization scheme. According to the method, the scaling trend of the mine water recharge reservoir can be effectively predicted, the recharge process is monitored, and continuous operation of deep well recharge sealing work of mine water is facilitated.

The invention relates to the field of metal surface treatment, and discloses an efficient electroplating process for a cotton picker spindle and an electroplating liquid formula, the efficient electroplating process comprises the following steps: step 1, substrate pretreatment: sequentially carrying out alkali washing, acid washing and plasma activation on the spindle; step 2, preparing an electroplating solution: dissolving nickel sulfate, sodium hypophosphite, a composite nano additive and a complexing agent in water, and adjusting the pH value to 4.8-5.3; step 3, gradient pulse electroplating: carrying out pulse electroplating in three stages, including bottom layer deposition, transition layer deposition and composite layer deposition; 4, post-treatment is conducted, specifically, silane sealing and curing are conducted on the plating layer; the base body pretreatment in the first step comprises the following sub-steps of alkali washing and oil removal, wherein the picking ingot is soaked in a NaOH solution with the concentration being 45-55 g / L. According to the method, high-density hydroxyl active sites are constructed on the surface of the metal base material through a plasma activation process, strong chemical bonding is formed between a plating layer and the base material, and the interface bonding strength is remarkably improved.

The invention relates to the technical field of preparation of iron phosphate materials, in particular to a method for doping iron phosphate with titanium, which comprises the following steps: 1, dissolving a titanium dioxide by-product ferrous sulfate powder in water to prepare a titanium-containing iron source solution; 2, adding water into the reaction kettle, and stirring; 3, adding the titanium-containing iron source solution, the phosphorus source solution, ammonia water and an oxidizing agent into a reaction kettle to prepare primary slurry; 4, carrying out filter pressing on the primary slurry, washing until the conductivity is less than or equal to 2000us / cm, and then adding water to prepare secondary slurry; 5, phosphoric acid is added into the reaction kettle for bottoming, and the temperature is increased to 60-70 DEG C; 6, adding the secondary slurry into the reaction kettle, and carrying out heat preservation reaction on the secondary slurry and phosphoric acid; and 7, filtering the reaction product obtained in the step 6, washing until the conductivity is less than or equal to 500us / cm, and then drying and sintering. According to the method, the titanium doping technological process is simplified, and meanwhile the titanium element utilization rate in the titanium dioxide by-product and the purity of the titanium-doped iron phosphate product are improved.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention provides a preparation method of mannitol carbonic acid sulfate, mannitol and dimethyl carbonate are used as starting raw materials to prepare mannitol carbonic acid sulfate, a target compound is obtained through ester exchange, cyclization and oxidation reaction, the raw materials are low in price and easy to obtain, the reaction operation is simple and convenient, the yield of the obtained product is 81% or above, the purity is 99.6% or above, and the method is suitable for industrial production. The method is suitable for industrial production.

The invention provides a material for removing sodium ions in saline-alkali soil and a preparation method, and relates to the field of sodium ion adsorbents, the preparation method comprises the following steps: (1) lignin modification: under a water bath condition, dissolving sulfate lignin in a mixed solution of analytically pure acetic acid and 30% hydrogen peroxide, then adding ferric chloride, reacting for 1.5-2.5 hours, diluting with distilled water by 7-8 times, centrifuging and washing to obtain modified lignin; drying to obtain oxidized lignin; (2) hydrogel synthesis: mixing and stirring the oxidized lignin and analytically pure acrylic acid, adding a cross-linking agent and an initiator, and reacting in a drying oven at 65-75 DEG C for 1.5-2.5 hours to form a sodium ion adsorption material with a porous interpenetrating network structure; by modifying the lignin, particularly introducing more hydroxyl and carboxyl groups, the performance of the lignin in the application of adsorbing ions, preparing hydrogel and the like can be improved.

The invention discloses a softening treatment method for high-calcium and high-sulfate radical sewage. By adding the seed crystal, calcium sulfate is crystallized to achieve the purpose of removing calcium ions, so that the generation of chemical sludge is avoided, and the cost of treating the chemical sludge is further reduced; according to the invention, the seed crystal is selected according to the saturation degree of the sewage, and the dosage of the seed crystal is determined, so that the selection of the optimal seed crystal type and dosage is achieved, the cost is saved, and the purpose of softening water is achieved.

The invention discloses a method for preparing a high-purity vanadyl sulfate solution in a short process. The method comprises the following steps: (1) pretreating stone coal vanadium ore to obtain tailing powder; (2) the tailing powder is mixed with water and concentrated sulfuric acid for curing, vanadium cured ore is obtained, water is added for leaching, and vanadium-containing leachate is obtained; (3) reducing and extracting the vanadium-containing leachate to obtain a first-section loaded organic phase; (4) carrying out reverse extraction on the first-section loaded organic phase, and extracting a reverse extraction solution to obtain a second-section loaded organic phase; and (5) carrying out reverse extraction on the second-section loaded organic phase, and separating a water phase to obtain the high-purity vanadyl sulfate solution. Starting from the stone coal vanadium ore crushing process, the high-purity electrolyte is directly prepared through the curing leaching-neutralization iron removal-two-stage extraction technology, the method has the advantages of being low in cost, environmentally friendly, short in technological process and low in agent consumption and energy consumption, the prepared high-purity vanadyl sulfate solution is high in concentration and purity, and the method is suitable for industrial production. And impurity separation and vanadium enrichment in the vanadium shale acid leaching solution are effectively realized.

The invention relates to the technical field of gypsum fiberboard raw material treatment, in particular to a plant fiber for a gypsum fiberboard and a preparation method and application thereof. Compared with the prior art, the preparation method provided by the invention adopts specific process steps, plant fiber raw materials are softened by using a supersaturated calcium hydroxide solution to partially remove lignin, the treated plant fiber slurry is introduced into a sulfuric acid solution for neutralization in the water washing process, and generated nano-scale calcium sulfate particles are attached to the surfaces of the plant fibers, so that the surface of the plant fibers is uniform. The plant fiber coagulant plays a role of a coagulant during production of the gypsum fiberboard, and the plant fiber meeting the requirements of production of the gypsum fiberboard is prepared. The preparation method provided by the invention is low in cost, and the gypsum fiberboard prepared from the obtained plant fiber for the gypsum fiberboard has relatively high mechanical property indexes and meets the performance requirements of boards for building decoration.

The invention discloses an iron-doped manganous-manganic oxide material and a preparation method and application thereof.According to the iron-doped manganous-manganic oxide material and the preparation method and application thereof, manganese sulfate serves as a manganese source, DTPA ferric ammonium salt serves as a complexing agent and a doping agent, ammonia water serves as alkali liquor, ethyl alcohol serves as a dispersing agent, and the preparation process is optimized in a targeted mode; the iron-doped manganous-manganic oxide material with uniform particle size distribution is prepared, the doping uniformity of the iron element in large-size micron-sized manganous-manganic oxide particles is improved while the sulfur content in the material is reduced, and the product is good in particle size uniformity and high in tap density. In addition, the process provided by the invention also has the characteristics of simple flow, easiness in operation, low input cost, high economic benefit and large-scale popularization and application.

The invention relates to the technical field of water treatment, and discloses an aluminum-based composite silicon removal agent and application thereof. The aluminum-based composite silicon removal agent comprises a component A and a component B, the component A is sodium metaaluminate; the component B comprises one or more of crystalline aluminum chloride, polyaluminum chloride and polyaluminum sulfate. The two components in the aluminum-based composite silicon removal agent can form multi-stage aluminum form distribution of'multi-core-mononuclear-colloid 'in wastewater, so that a complete silicon removal path of'pH regulation and control, charge neutralization, adsorption complexing, bridging flocculation and chemical precipitation' is constructed, and efficient removal of silicate radicals can be realized. The composite silicon removal agent does not need to accurately adjust the pH value of the system, the requirement for operation precision is low, operation is easy, and the dosage of the agent is small.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The production device comprises a base, a reaction barrel is fixedly arranged on the base, a mounting frame is fixedly arranged on the outer side of the reaction barrel, a motor is fixedly connected to the top end of the mounting frame, and a stirring device for stirring basic zirconium sulfate and tartaric acid is arranged in the reaction barrel. The feeding parts are sequentially added into the reaction barrel, and a discharging part for discharging reacted liquid is arranged in the reaction barrel; through the staggered and periodic coincidence design of discharging grooves of the inner barrel and the outer barrel in the feeding part, the rotating rod is matched to drive the outer barrel to spirally move downwards, accurate and quantitative adding of the basic zirconium sulfate solution is achieved, meanwhile, the adding time and flow of the tartaric acid solution are automatically controlled through magnetic ring adsorption of the upper barrel and the outer barrel and stored energy release of the first spring, and the feeding efficiency is improved. Manual intervention is reduced, efficiency loss caused by step-by-step feeding is avoided, and the preparation efficiency of the water repellent agent is remarkably improved.

The invention discloses a sulfuric acid residual water neutralization device, and relates to the technical field of sewage treatment. A sulfuric acid residual water neutralization device comprises a base and further comprises a transversely-arranged barrel body rotationally installed on the base, a feeding port is formed in the edge of the shaft end of the barrel body, and a driving part for driving the barrel body to rotate is arranged on the base; the transverse shaft is transversely arranged in the barrel body, the outer wall of the transverse shaft is connected with a stirring rod, the outer wall of the stirring rod is fixedly connected with a branch rod, the tail end of the stirring rod is connected with an elastic scraping plate, the outer wall of the barrel body is provided with a driving source for driving the transverse shaft to rotate, and the transverse shaft is provided with a telescopic part for driving the stirring rod to stretch out and draw back along the axis; according to the invention, the neutralization efficiency of sulfuric acid is higher, the lime and calcium sulfate precipitate are not easy to precipitate, and the lime is not easy to cake.

The invention belongs to the technical field of floor support plates, and particularly relates to a material for a concrete floor support plate, which is prepared from 150 to 170 parts of cement, 30 to 35 parts of mineral admixture, 200 to 250 parts of sand, 100 to 120 parts of gravel, 40 to 45 parts of fiber, 5 to 10 parts of early strength agent and 140 to 150 parts of water. The early strength agent comprises the following components in parts by weight: 20-30 parts of a polycarboxylate superplasticizer, 5-10 parts of modified nano zeolite powder, 5-9 parts of lithium acetate, 3-5 parts of a complexing agent, 5-10 parts of calcium sulfate and 1-4 parts of diisopropanolamine. The fibers, the mineral admixture and the early strength agent are added into the formula, early hydration of cement is promoted, dry shrinkage and cracking caused by too fast later hydration of cement are avoided, the compressive strength and breaking strength of the concrete floor support plate are effectively improved, the maintenance period of the concrete floor support plate is shortened, and the production cost is reduced.

The invention relates to a device and a method of a high-sensitivity suspension single-droplet sensor for monitoring PM2.5 pollution, belongs to the technical field of aerosol microdroplet spectrum trace analysis, and solves the problem that ppb-magnitude gas cannot be monitored in the prior art. The method comprises the following steps: pumping aerosol into a sample cell of a droplet suspension system in a single droplet form; introducing required reaction gas into the sample pool through an atmosphere control system; scattered light signals of the single liquid drops are respectively input into the dynamic signal processing system and the microdroplet imaging system; acquiring the characteristic peak displacement change of the metal ion sensing microdroplet; establishing a gas particle distribution Mie scattering inversion model based on micro-droplet dynamic response; inverting the radius of the liquid drop according to the stimulated Raman scattering / stimulated elastic scattering signal; according to the quantitative relationship of the reaction, calculating the generation of sulfate by the droplet suspension system (sensor); and judging which gas in the actual atmosphere is a main oxidation pathway for oxidizing sulfur dioxide to generate sulfate pollutants according to a calculation result.

The invention provides high-performance silver powder suitable for TOPCon battery fine grid silver paste, a preparation method of the high-performance silver powder and the silver paste, and belongs to the technical field of photovoltaic materials. The preparation method comprises the steps that a silver salt solution and a composite reducing agent are mixed, a first-stage hydrothermal reaction is carried out at the first temperature, a second-stage hydrothermal reaction is carried out at the second temperature, and silver powder is obtained after centrifugation, washing and drying; wherein the composite reducing agent is selected from a mixture of two of potassium tartrate, sodium sulfite and ferrous sulfate. According to the method, gradual growth and crystallinity improvement of silver crystal nucleuses are achieved through two-stage heating, particle aggregation or uneven morphology caused by rapid reduction is avoided, in addition, the adopted composite reducing agent combination is remarkably superior to a single reducing agent (such as ascorbic acid), and the morphology and particle size distribution of the silver powder can be more accurately regulated and controlled.

The invention discloses a quick-setting high-strength expansive type leakage crack plugging material and method and application, and belongs to the technical field of cement-based material admixtures, the quick-setting high-strength expansive type leakage crack plugging material is prepared by adopting a mixing method, and the quick-setting high-strength expansive type leakage crack plugging material comprises a base material formed by compounding cement, desulfurized gypsum, calcium oxide, alkaline aluminum oxide, calcium formate, hydrated calcium silicate, carboxyl cellulose and a solid polycarboxylate superplasticizer; the active component is formed by compounding polyaluminum sulfate, magnesium sulfate, disodium ethylene diamine tetraacetate, borax and a defoaming agent; the superfine fly ash, the superfine silicon dioxide, the superfine hydroxyapatite, the superfine zinc sulfate, the nano titanium dioxide and the superfine boron nitride are compounded to form a structure regulating functional component. The three components are uniformly stirred by adding water, and then are mixed with an exciting agent to be used for plugging leakage cracks and filling gaps. The leakage plugging material provided by the invention has the advantages of scientific and reasonable composition, simple preparation and application methods, rapid curing, high strength, good durability, micro-expansion and the like, and has good plugging and filling effects on water bursting, water permeation and gas.

The invention provides a method and a system for predicting the durability of an underwater non-dispersible concrete structure, and relates to the technical field of material engineering. Respectively measuring an anti-permeability vector consisting of an unsteady state chloride ion migration coefficient, an anti-permeability grade and an oxygen permeation coefficient, a freezing resistance vector consisting of a mass loss rate and a dynamic elastic modulus retention rate, and a corrosion resistance vector consisting of a mass change rate in a sulfate environment, the dynamic elastic modulus retention rate and a corrosion rate in a carbonic acid environment; a fitting formula among impermeability, freezing resistance and corrosion resistance is constructed based on a known high-durability concrete sample, and by calculating the decoupling degree of each vector combination of the concrete sample relative to the high-durability concrete sample, multi-parameter collaborative evaluation and accurate prediction of the durability of the concrete structure are realized.

The invention discloses an anti-sulfate-attack preparation method of solid waste concrete, and relates to the technical field of building materials and civil engineering, the anti-sulfate-attack solid waste concrete is prepared from the following materials in parts by weight: 100 parts of cement, 30-50 parts of composite solid waste cementing material, fly ash, steel slag micro powder and coal gangue according to a given mass ratio, 60-80 parts of modified recycled aggregate; 0.05-0.1 wt% of sodium molybdate as an erosion inhibitor. According to the invention, solid waste activation-interface reconstruction-ion competition-structure self-healing is taken as a core, synchronous spanning of solid waste concrete in the dimensions of sulfate erosion resistance, resource consumption, construction convenience and the like is realized through multi-process collaboration, and the gelation potential of solid wastes such as fly ash and steel slag is accurately excited through microwave targeted activation, so that the construction efficiency is improved. And a dense microstructure is reconstructed by combining a nano-SiO2 induced crystallization technology, so that excellent mechanical properties are still ensured when the solid waste mixing amount exceeds 70%.

The invention discloses a copper-titanium etching solution and a preparation method thereof, and belongs to the technical field of etching solution preparation. The etching solution is prepared from the following components in percentage by mass: 4.5-7.5% of potassium peroxymonosulfate composite salt, 1.2-2.8% of sodium percarbonate, 1.2-2.8% of benzotriazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3- The cleaning agent is prepared from the following components in percentage by weight: 1.2%-1.8% of 1, 3-dicarboxylic acid, 0.3%-0.8% of 5-aminotetrazole, 0.15%-0.45% of ethylenediamine tetraacetic acid tetrasodium salt, 0.15%-0.45% of hydroxyethylidene diphosphonic acid, 0.15%-0.45% of cocamidopropyl betaine, 0.3%-0.8% of benzotriazole, 0.15%-0.45% of 2-mercaptobenzothiazole, 0.02%-0.08% of poly-N-isopropylacrylamide, 0.7%-1.8% of potassium perchlorate and the balance of ultrapure water. According to the etching solution, the copper-titanium etching rate can be accurately regulated and controlled, back cutting and titanium residues are effectively inhibited, the stability of the etching solution is improved, and the service life of the etching solution is prolonged.

The invention relates to the technical field of iron phosphate preparation, in particular to a preparation method of low-impurity iron phosphate with a high iron-phosphorus ratio, which at least comprises the following steps: preparing an iron source solution and a phosphorus source solution; mixing an oxidizing agent and a phosphorus source solution as a phosphorus source mixed solution; adding the phosphorus source mixed solution into the iron source solution, and controlling the molar ratio of iron to phosphorus to be 1: (1.1-1.3) to prepare slurry; dividing the slurry into two parts, respectively adding an impurity removal agent, and then carrying out segmented aging at 90 DEG C to prepare crystallized slurry; and filtering, washing, drying and calcining the crystallized slurry to obtain a target product iron phosphate finished product. The impurity removal agent is selected from one or more of ferrous sulfate, ferrous chloride, ferrous nitrate and ferrous oxalate. Seed crystals are formed through segmented aging crystal transformation to promote crystal growth, and autonomous grain size distribution is achieved; an impurity removing agent is added in the aging stage, impurities are reduced by using the same ion effect, the iron-phosphorus ratio is increased, and the compaction density and the electrical property of the prepared lithium iron phosphate are remarkably improved.

The present invention belongs to the technical field of chemical separation and purification, and specifically relates to a method for removing impurities from a hydroxylamine aqueous solution. The method for removing impurities from a hydroxylamine aqueous solution provided by the present invention comprises the following steps: mixing a hydroxylamine aqueous solution and an alkaline compound for sedimentation and then performing solid-liquid separation to obtain a liquid phase; the alkaline compound comprises barium hydroxide or calcium hydroxide; the liquid phase is passed through an ion exchange column for ion exchange to obtain a purified hydroxylamine aqueous solution; the resin in the ion exchange column is a resin containing phenolic hydroxyl groups. The phenolic hydroxyl-containing resin used in the present invention is easy to obtain, has a wide range of sources, and has low cost. The present invention first uses an alkaline solution to remove sulfate or phosphate in a hydroxylamine aqueous solution, and then uses a phenolic hydroxyl-containing resin to efficiently, quickly, and conveniently remove metal ions in the hydroxylamine aqueous solution without reacting with hydroxylamine. The impurity removal method provided by the present invention has the advantages of simple operation and obvious purification effect, and has good industrial prospects.

The invention discloses an iron-based layered silicate material for efficiently removing variable-valence heavy metals and water treatment application of the iron-based layered silicate material, and belongs to the technical field of water treatment.The preparation method of iron-containing layered silicate minerals comprises the following steps that ferrous sulfate heptahydrate is dissolved in water, sodium dithionite and sodium orthosilicate are sequentially added, stirring is conducted, and a mixture is obtained; stirring, homogenizing and aging for two hours; the hydrothermal reaction kettle is used for reacting in a high-temperature and high-pressure environment; according to the iron-containing layered silicate mineral material, a unique layered structure similar to natural iron-containing layered silicate minerals and high adsorption performance are reserved, variable-valence heavy metal arsenic in a wastewater solution is synergistically and efficiently removed by means of the oxidation-reduction activity of the iron-containing layered silicate mineral material and induction of generation of Fenton-like reaction, and the iron-containing layered silicate mineral material is obtained. The method disclosed by the invention shows high treatment efficiency, environmental friendliness and remarkable economic benefits, and is expected to exert remarkable environmental benefits in the field of water treatment.

The utility model discloses a production line for preparing manganese sulfate from zinc smelting manganese-containing slag, the production line for preparing manganese sulfate from zinc smelting manganese-containing slag comprises an autoclave evaporator and at least one reaction tank, the autoclave is provided with a gas inlet and a gas outlet opposite to the gas inlet, the autoclave is suitable for accommodating a zinc anode slime mixture, the gas inlet is suitable for introducing reducing gas, and the gas outlet is suitable for introducing reducing gas; carrying out reduction leaching reaction with a zinc anode mud mixture; the reaction tank is positioned at the downstream of the high-pressure kettle and is used for performing impurity removal treatment on a solution flowing into the reaction tank; and the evaporator is positioned at the downstream of the reaction tank and is suitable for evaporating, crystallizing and drying the solution flowing into the evaporator. Therefore, through the cooperation of the autoclave, the reaction tank and the evaporator, a continuous production line for reduction leaching, purification and impurity removal, evaporative crystallization and drying is formed, the high value of manganese ions and the recycling of the zinc smelting manganese-containing slag can be optimized, the technological process and the production cost can be saved, and the production line is high in applicability and universality, environmentally friendly and capable of saving energy.

The invention discloses a precious metal leaching agent based on thiosulfate and a precious metal leaching process. The leaching agent contains thiosulfate, a thiourea-based catalyst and an iron-based oxidizing agent, and the molar ratio of the thiosulfate to the thiourea-based catalyst to the iron-based oxidizing agent is (0.05-5): (0.005-1): (0.005-1). According to the leaching agent, on the basis of the synergistic effect of all the components, the dissolution efficiency of precious metal is improved, generation of polysulfate in side reaction is greatly reduced, and follow-up precious metal recovery is facilitated. A leaching process adopting the leaching agent comprises the following steps: exposing precious metal sites of a precious metal-containing material, adding the leaching agent, adjusting the pH value of a leaching system, carrying out a leaching reaction, and carrying out solid-liquid separation after the reaction is finished, so as to obtain a precious metal leachate. According to the technology, by controlling the pH value of the system and the adding amount of the leaching agent, leaching of different grades and types of precious metal-containing materials can be achieved under the normal temperature condition, and tests show that by taking gold ore as an example, the gold recovery rate of the technology can reach 100% at most.

The present application relates to electrolytic manganese technology field, specifically to a kind of method for removing heavy metal ions in manganese sulfate solution.The method for removing heavy metal ions in manganese sulfate solution provided by the present application includes the following steps: adding oxidizing agent to pretreated manganese sulfate solution, mixing and stirring, then adjusting the pH value of solution to 5.5-6.0, filtering, to obtain the first purified manganese sulfate solution;Add sulfidation agent to the first purified manganese sulfate solution, filter, to obtain the second purified manganese sulfate solution;Add porous resin polymer to the second purified manganese sulfate solution, add the mixed solution into a sealed container, introduce nitrogen, make the pressure in the sealed container reach 1.1-1.5MPa and maintain for 2-10min, then open the air valve and release pressure instantaneously, stand, filter, fine filter, to obtain the purified manganese sulfate solution.The method provided by the present application can not only effectively remove heavy metal ions in solution, but also effectively reduce the COD value of the purified solution, reduce the loss of manganese content in solution.

The invention provides a manganese sulfate purification method based on a membrane separation technology, and relates to the technical field of manganese sulfate purification, the manganese sulfate purification method comprises the following steps: S1, pretreatment and solution blending: starting a stirring tank for stirring at a stirring speed of 230-500 RPM; adding a raw material solution into the stirring tank; adding a mixed solvent into the raw material solution, wherein the total adding amount of the mixed solvent accounts for 1-2% of the mass of the raw material solution; according to the preparation method, a mixed solvent and a stability additive are introduced in the raw material solution preparation stage, and the stirring speed and the reaction temperature are regulated and controlled, so that the uniformity and the system stability of raw material components are enhanced, the solubility and the dispersity of impurity components are reduced, and subsequent impurities are promoted to be thoroughly and sufficiently settled; in the chemical precipitation stage, precipitation of the impurities is accelerated by controlling the proportion of a precipitator, the reaction temperature and the stirring speed, so that the precipitation rate and the particle size uniformity of precipitated particles are improved, and the impurities are fully separated from a main solution.

The invention relates to the technical field of waste gas purification, in particular to a waste gas purification device for magnesium sulfate production. The wrinkled cylindrical filter screen is fixed on the hollow mounting disc and is used for filtering waste gas; the telescopic end of the driving air cylinder is downwards connected with a driving ring; the ends, far away from the driving ring, of the limiting curved bars are connected with vertical hinge bars, and an inclined outer pipe is rotationally connected between every two vertical hinge bars. According to the waste gas purification device for magnesium sulfate production, through the design of airflow backpressure triggering, nozzle self-adaptive approaching and vibration cooperation, when a filter screen is blocked, an arc-shaped nozzle pushes a wedge-shaped block to be unlocked through backpressure, an inner barrel drives the nozzle to approach the filter screen through a reset spring, the airflow distance is shortened, the impact pressure is improved, and sulfate scales are shattering through cooperation with a pneumatic vibrator; and the spray heads obliquely and tangentially spray air and penetrate into the valley parts of the wrinkles, cleaning dead angles are avoided, and replacement of the filter screen is greatly reduced.

The invention discloses a soil conditioner and a preparation method thereof, and relates to the field of soil conditioners, in particular to a soil conditioner and a preparation method thereof. The preparation method of the soda saline-alkali soil improver comprises the following steps: 1, taking fulvic acid, anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous aluminum chloride for later use; 2, dissolving fulvic acid in a deionized water solution to prepare a fulvic acid solution, and then adding anhydrous calcium chloride, magnesium chloride and aluminum chloride into the fulvic acid solution; 3, uniformly stirring and mixing; 4, transferring the stirred mixed solution into a hydrothermal reaction kettle, and heating; 5, after the hydrothermal reaction is finished, cooling to room temperature, carrying out suction filtration, and drying filter residues at low temperature; and 6, grinding the dried filter residues to obtain the soda saline-alkali soil improver. The soda saline-alkali soil improver is an acidic Ca, Mg and Al hydrotalcite intercalation material; an anhydrous calcium sulfate phase and a compound (H3O) Al3 (SO4) 2 (OH) 6 phase containing aluminum and sulfate radicals are mainly used; the pH of the soda saline-alkali soil can be improved more quickly.