178 results about "Polyferric sulfate" patented technology

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 discloses a biomass-inorganic-organic ternary composite flocculant and a preparation method and application thereof, and belongs to the field of coking wastewater treatment.The preparation method comprises the steps that chitosan serves as a substrate material, glutaraldehyde serves as a cross-linking agent, and polyferric sulfate (PFS) and chitosan are subjected to chemical cross-linking to generate an intermediate product PFS and chitosan composite particles; then potassium persulfate is used as an initiator, graft copolymerization of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride is initiated through hydroxyl on the surface of PFS-chitosan, a cationic branched chain is introduced, and a final product is obtained. Through multi-component cooperation and structural design, the defects that a traditional flocculating agent is not thorough in demulsification, large in sludge amount, unstable in floc combination and the like in coking wastewater treatment are overcome, and the flocculating agent is particularly suitable for treating oil pollutants in coking wastewater.

The invention discloses a modified polyferric coagulant and a preparation method thereof, and belongs to the technical field of papermaking wastewater treatment.The polyferric sulfate serves as a main chain and then is combined with carboxylated polyvinyl alcohol, the carboxylated polyvinyl alcohol contains a large number of carboxyl groups, and the carboxylated polyvinyl alcohol and iron ions in polyferric molecules can form stable complexing coordination bonds; kH-570 can generate a polyhydroxy complex after hydrolysis, and active silanol on the surface of the hydrolysis product serves as a carrier with a larger surface area, can be combined with polyferric sulfate and can be subjected to a condensation reaction with hydroxyl and amino on chitosan, so that the molecular weight of the polymer is increased. Compared with a conventional coagulant, the prepared modified polyferric coagulant has the advantages that the selective adsorption performance is increased, the characteristic that PFS carries a large number of positive charges is reserved, meanwhile, molecular chains are increased, the speed of net capturing, sweeping and floc forming is increased, and the coagulation effect is higher.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

The invention relates to the technical field of low-carbon cement preparation, and particularly discloses an anti-carbonization type low-carbon slag powder cement material and application thereof. The cement material comprises the following components in parts by weight: 55-75 parts of slag powder, 15-25 parts of gypsum powder, 3-10 parts of a cement gelling component, 1-3 parts of spinel powder and 2-5 parts of an anti-carbonization agent, wherein the anti-carbonization agent is formed by mixing polyferric sulfate, water-soluble phosphate and water-soluble carbonate according to the mass ratio of (7-10): (3-5): 1. The anti-carbonization type low-carbon slag powder cement material does not cause the risk of alkali aggregate reaction and does not depend on a nano material, so that the anti-carbonization performance of the low-carbon slag powder cement is improved, and the mechanical property of the low-carbon slag powder cement is improved.

The invention discloses an advanced treatment method of tungsten beneficiation wastewater, which is characterized in that a composite flocculant is adopted to flocculate the tungsten beneficiation wastewater, and the composite flocculant is mainly composed of cationic polyacrylamide, a flocculant A and lignocellulose, the flocculant A comprises at least one of polyferric sulfate, polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric sulfate, ferric sulfate, ferrous sulfate and aluminum chloride. According to the advanced treatment method for the tungsten beneficiation wastewater, under the action of the composite flocculant, the cost of a treatment agent can be reduced to about 0.16-0.20 yuan / m < 3 >, the cost reduction amplitude is as high as 80% or above, the treatment time can be shortened to be within 10 min, the precipitation time is greatly shortened, meanwhile, suspended solids in the wastewater can be effectively removed, actual production requirements are met, and the method is suitable for industrial production. The method has the advantages of low treatment cost, high treatment efficiency, good removal effect, good adaptability and the like, can realize advanced treatment of the tungsten beneficiation wastewater, and is high in use value and good in application prospect.

The invention discloses a polymeric ferric sulfate production filtering device and filtering method.The polymeric ferric sulfate production filtering device comprises a filtering box, a filtering base is fixed between the inner walls of the filtering box, a filtering cavity is formed in one side of the top of the filtering base, a plurality of filtering holes are formed in the bottom of the filtering base in a penetrating mode, and a foam puncturing static electricity removing mechanism is arranged on the filtering box; the invention relates to the technical field of polyferric sulfate production. According to the polymeric ferric sulfate production filtering device and filtering method, through the arrangement of the foam puncturing static electricity removing mechanism, the movement of the L-shaped rod is utilized to drive the stabs to move and puncture foams generated by a stirred polymeric ferric sulfate solution, positive and negative charges on the surface of a liquid film can be separated when the foams are broken, and the charges are transferred to the bottom wall of the filtering seat; through rolling of the static electricity eliminating roller, the static electricity eliminating roller generates charges opposite to the filter seat and the polymeric ferric sulfate colloid particles through an external high-voltage power supply, static electricity between the filter seat and the polymeric ferric sulfate colloid particles is neutralized, the static electricity adsorption force is weakened, and the filtering efficiency is greatly improved.

The present invention discloses a method for removing impurities from waste acid and fully recycling the waste acid. The method comprises the following steps: introducing hydrogen sulfide into the waste acid for a sulfidation reaction, removing arsenic sulfide and mercuric sulfide precipitates formed during the reaction; continuing to introduce hydrogen sulfide for a step-by-step sulfidation reaction, adding an iron-containing substance to adjust the reaction pH and ORP, and recovering the copper, lead, and zinc sulfide slag precipitates formed during the reaction in a step-by-step manner; adding an iron-containing substance for a neutralization reaction, controlling the pH and ORP, promoting the reaction between iron ions and arsenate, and removing the ferric arsenate precipitate formed during the reaction; adding an adsorbent for an adsorption reaction, and removing fluorine-containing and thallium-containing components by adsorption; introducing an oxidant for an oxidative hydrolysis reaction, controlling the degree of hydrolysis, and preparing polyferric sulfate. The present invention utilizes the iron-containing substance to remove impurities from waste acid, thereby achieving deep impurity removal and full resource utilization of waste acid.

The present invention provides a method for preparing polyferric sulfate from solid waste yellow ferrous sulfate in a titanium dioxide factory, comprising the following steps: dissolving the yellow ferrous sulfate raw material in water, adding iron oxide red under heating conditions, stirring until the reaction is complete, and then filtering to remove insoluble impurities; adding an oxidant to the filtrate, heating and stirring to carry out oxidation, hydrolysis, and polymerization reactions to obtain a liquid product; concentrating and drying the liquid product to prepare solid polyferric sulfate. The method neutralizes the free acid in the raw material yellow ferrous sulfate by adding iron oxide red, increases the content of effective component iron in the system, and the prepared product has a relatively high basicity and good polymerization effect, and no external acid or alkali is required during the preparation process. The present invention eliminates the environmental protection hidden danger caused by the stacking of solid waste, enables the comprehensive utilization of industrial waste by-products, reduces the production cost of polyferric sulfate, and improves the economic benefit of titanium dioxide production.

This invention relates to the field of industrial wastewater treatment technology, specifically a highly efficient treatment method for methionine wastewater, comprising the following steps: Step 1: pH adjustment, adjusting the pH of the methionine wastewater to 6.0-7.0; Step 2: Polyferric sulfate coagulation and sedimentation, adding polyferric sulfate and polyacrylamide to the pH-adjusted wastewater; Step 3: Pre-stage ozone oxidation, passing the supernatant obtained in Step 2 through ozone-containing gas for oxidation treatment; Step 4: Biochemical treatment, subjecting the effluent from Step 3 to a biochemical reaction, sequentially passing through anoxic and aerobic stages; Step 5: Post-stage ozone oxidation, passing the biochemical effluent obtained in Step 4 again through ozone-containing gas for deep oxidation treatment; Step 6: Activated carbon adsorption. The methionine wastewater treated by this invention can significantly reduce TOC concentration and improve COD removal rate. The pH pre-adjustment step effectively reduces the quenching effect of alkalinity on hydroxyl radicals, ensuring the efficiency of subsequent advanced oxidation processes.

This invention provides a method for removing impurities and recovering nickel anolyte from electrolytic nickel. The method includes the following steps: (1) mixing the electrolytic nickel anolyte with liquid alkali, separating the solid and liquid components to obtain nickel hydroxide and filtrate, evaporating the filtrate to obtain sodium sulfate; mixing the electrolytic nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt for lead removal; (3) adjusting the pH of the material obtained after lead removal with nickel hydroxide to obtain an arsenic removal solution, mixing the arsenic removal solution with polyferric sulfate for arsenic removal; (4) mixing the material obtained after arsenic removal with an oxidant to obtain an iron removal solution, performing solid-liquid separation on the iron removal solution to obtain lead-, arsenic-, and iron-removed cathode liquid and iron-containing slag, adding sodium sulfate to the lead-, arsenic-, and iron-removed cathode liquid, and reusing it in the electrolytic nickel process. The method of this invention can efficiently and quickly remove lead, arsenic, and iron from electrolytic nickel anolyte and reuse it.

The invention relates to the field of chemical technology, in particular to a preparation device of temperature-controlled solid acid particles and a preparation method thereof. The device comprises a shell, a controller is installed on the outer side of the shell, a first partition is installed in the inner cavity of the shell, a first mixing mechanism is installed on the upper end of the first partition, a second mixing mechanism is installed on the bottom end of the inner cavity of the shell, and a stirring mechanism is installed on the upper end of the shell through a frame. Compared with the prior art, the device has reasonable structural design and strong practicability, is convenient for temperature control of the preparation process of solid acid particles (polyferric sulfate), is convenient for rapid cooling to reduce the solution temperature after sulfuric acid dilution, is convenient for rapid use, improves the production efficiency of polyferric sulfate, is convenient for mechanical linkage to rotate two stirring components in a linkage manner, reduces equipment cost, is convenient for filtering and collecting polyferric sulfate, and effectively improves the use effect.

The invention discloses a defluorination agent suitable for defluorination of electronic industrial wastewater as well as a preparation method and a defluorination method of the defluorination agent. The defluorination agent comprises 9-10 wt% of aluminum salt, 0.1-0.2 wt% of ferric salt, 0.6-1.1 wt% of an alkaline regulator and the balance of water, the aluminum salt is selected from one or more of polyaluminum chloride and aluminum sulfate, and the ferric salt is selected from one or more of ferric trichloride, ferric sulfate and polyferric sulfate. The fluorine removal agent provided by the invention can realize that the fluorine concentration of discharged water is lower than 1mg / L through one-stage / two-stage fluorine removal under a low-fluorine, medium-fluorine or high-fluorine water inlet condition, the optimal pH condition of reaction is reduced, the acid-base and agent use cost is saved, and meanwhile, the fluorine removal agent is simple in preparation method and can be applied to large-scale popularization and production.

The invention relates to the technical field of water treatment agent preparation and environmental governance material processing, in particular to a stirring tank for polyferric sulfate production and a control method thereof.The control device divides reaction stages based on liquid level height, temperature rise rate and pH / turbidity data, and adjusts the stirring speed through a variable frequency driver; and precise switching between turbulent dispersion and laminar oxidation is realized. The interlocking protection module triggers emergency control according to liquid level abnormity or power overrun, and the hydraulic switching device achieves quick replacement of the paddle set. And the environment-friendly treatment module is linked with a cyclone separator, a screw conveyer and a flow meter through turbidity and mass threshold values to form closed-loop control of solid-liquid separation and product treatment. Historical process parameters are iteratively optimized through a machine learning algorithm, a temperature control threshold value and a rotating speed reference value are adaptively corrected, side reactions are effectively inhibited, the product purity is improved, and the solid waste treatment load is reduced.

Provided is a novel method for producing an adsorbent comprising an iron compound and having a large adsorption capacity. An adsorbent having a specific surface area of 200 m2 / g or more, a primary particle size of 10 nm or less, an iron content of 450 g / kg or more, and a moisture content of 100 g / kg to 300 g / kg can be obtained by the method for producing an adsorbent, the method including: a first step for adding a polyferric sulfate aqueous solution to an alkali aqueous solution to form a slurry; a second step for adjusting the pH of the slurry to 5.0 to 9.0; and a third step for subjecting the slurry to solid-liquid separation, washing the obtained cake, and adjusting the moisture content of the washed cake.

The invention relates to a production process of polyferric sulfate. The production process comprises the following steps: a raw material treatment step: crushing and screening raw materials; an oxidation reaction step: adding an oxidizing agent into the treated raw materials for stirring reaction; and a polymerization reaction step: adding a polymerizing agent into the oxidized raw material for stirring reaction, removing impurities from the polymerized raw material, and drying to obtain a solid product. The problem that an oxidizing agent and a polymerizing agent react incompletely in an existing scheme is solved.

The invention provides a method for removing and recovering vanadium in alumina seed precipitation mother liquor, which comprises the following steps: mixing the alumina seed precipitation mother liquor, a calcium-containing precipitator and a settling aid, carrying out vanadium precipitation reaction, and carrying out solid-liquid separation to obtain vanadium-containing solid and vanadium-precipitated liquid; wherein the calcium-containing precipitant comprises an activated calcium-based compound; the settling agent comprises polymeric ferric sulfate. The method provided by the invention is high in vanadium removal efficiency, simple in condition and easy to operate, simple in process flow, free from influence on recovery of rare metals, high in high-value resource utilization rate of vanadium and wide in application prospect.

The utility model relates to the technical field of material dissolving, in particular to a dissolving tank for producing polymeric ferric sulfate, which is capable of uniformly mixing materials. According to the technical scheme, the stirring device comprises a bottom plate, a base plate and a tank body, the tank body is arranged on the upper surface of the bottom plate, the base plate is arranged at an opening of the tank body in a lifting mode through a lifting assembly, a first-stage stirring assembly and a second-stage stirring assembly are arranged on the base plate, the first-stage stirring assembly is rotationally connected with the second-stage stirring assembly, and the second-stage stirring assembly is rotationally connected with the first-stage stirring assembly. The first-stage stirring assembly is located at the bottom of the tank body, and the second-stage stirring assembly is located in the middle of the tank body. According to the utility model, materials in different areas in the tank body can be effectively stirred at the same time through the matching of the structures, so that the overall material dissolving efficiency is improved, the working intensity of the motor can be adjusted according to actual requirements, and unnecessary energy consumption waste is avoided.

The present invention discloses a controlled-release type polymeric ferric sulfate water treatment agent and its preparation method, belonging to the technical field of water treatment functional materials. The water treatment agent consists of polymeric ferric sulfate, an iron ion color indicator, a gel matrix, a cross-linking calcium agent, amino diatomaceous earth, a pore-forming agent and an inert filler. The preparation method includes: first preparing a network gel, then preparing soft materials, and finally obtaining the product through pill-making and drying. The present invention realizes the slow release and controllability of polymeric ferric sulfate, and the color indicator can directly reflect the consumption state of polymeric ferric sulfate, facilitating storage, transportation, dosing and recovery.

The invention discloses a liquid polyferric sulfate reducing substance rapid detection reagent and a preparation method thereof, and belongs to the technical field of reducing substance detection.According to the liquid polyferric sulfate reducing substance rapid detection reagent, qualitative judgment on the content of reducing substances can be directly achieved through solution color changes, complex titration operation and professional instrument analysis are not needed, and the detection accuracy is high. And the detection process is obviously simplified. Due to the rapid detection capability, the content of reducing substances in a product in the reaction kettle can be monitored in real time in the production process, the reaction process can be mastered in time, and time delay caused by detection in a sample feeding laboratory is avoided, so that invalid consumption of a catalyst and unnecessary prolonging of reaction time are effectively reduced, and the overall production efficiency is improved. Meanwhile, the qualitative judgment result of the reagent can directly correspond to the limit value requirement specified by the national standard, the requirement for rapidly screening the product quality in the production process is met, and convenient technical support is provided for ensuring that the final product meets the standard.

The utility model relates to a polymeric ferric sulfate liquid oxygen adding device, which belongs to the technical field of material adding and comprises a reaction kettle body, a stirring shaft and a stirring motor, a stirring impeller is fixed on the stirring shaft, a distribution stirring rod is fixed on the outer wall of the lower portion of the stirring shaft, and a connecting rod is fixed on the inner side of the upper portion of the distribution stirring rod and fixed with the stirring shaft. A flow channel is arranged at the lower part of the stirring shaft, a cavity communicated with the flow channel is arranged in the distribution stirring rod, a plurality of distribution holes communicated with the cavity are formed in the outer side wall of the distribution stirring rod, a rotary joint is fixed at the bottom of the stirring shaft, the rotary joint is connected with a liquid oxygen adding pipe, and an electric valve is arranged on the liquid oxygen adding pipe. The distribution stirring rods are arranged on the lower portion of the stirring shaft, the distribution holes are evenly formed in the distribution stirring rods, liquid oxygen is added through the rotating connector and the liquid oxygen adding pipe, then the liquid oxygen is sprayed out of the distribution holes in a rotating mode, the liquid oxygen is added and mixed more evenly, and follow-up catalytic reaction is better facilitated.

The invention discloses a short-process treatment method for high-salinity complex wastewater of a lead-copper smelting system. The method comprises the following steps: introducing compressed air into wastewater for pre-oxidation, then adding a COD and ammonia nitrogen removal agent, a heavy metal removal agent and polyferric sulfate, and reacting at normal temperature; adding anionic polyacrylamide to flocculate and precipitate, and carrying out filter pressing to obtain clear liquid 1; adding sodium hydroxide or calcium hydroxide into the clarified liquid 1, adjusting the pH value, then adding sodium carbonate, reacting at normal temperature, then adding anionic polyacrylamide, carrying out flocculent precipitation, and carrying out filter pressing to obtain clarified liquid 2; adding a defluorination agent and dilute acid into the clear liquid 2, controlling the pH value, and reacting at normal temperature; then adding anionic polyacrylamide for flocculent precipitation, and filtering to obtain clear liquid 3; and the clarified liquid 3 is filtered and discharged after reaching the standard, thereby realizing zero discharge of wastewater. The method can effectively solve the problem of overlong flow in the existing wastewater treatment method, and can also solve the problem that various pollutants cannot be synergistically removed or stably reach the standard in the existing wastewater treatment method.

The present invention discloses a method for coupling and modifying a biofilm carrier, which specifically includes: dissolving the industrial waste ferrous sulfate heptahydrate of titanium dioxide in water, adding a commercially available biofilm carrier filler and mixing evenly with the ferrous sulfate solution, acidifying the mixed solution with concentrated sulfuric acid, and then adding industrial aluminum sulfate; heating and stirring under the condition of a water bath at 50°C - 80°C, adding concentrated nitric acid for oxidation while stirring, and carrying out a polymerization reaction for 30 - 60 minutes; then adding a stabilizer, separating the biofilm carrier from the polyferric sulfate after standing for a period of time to obtain a modified biofilm carrier and a polyferric sulfate coagulant respectively. The method of the present invention realizes the modification of the biofilm carrier without affecting the preparation of the polyferric sulfate coagulant, and has the advantages of low cost, simple operation, easy industrial popularization, etc.

The invention belongs to the technical field of titanium dioxide production waste resource utilization and inorganic polymeric flocculant preparation, and discloses a closed-loop process for preparing artificial rutile and co-producing polymeric ferric sulfate by using titanium dioxide primary washing waste acid. The method solves the problems of low resource utilization rate of titanium dioxide primary washing waste acid, high acid consumption in preparation of artificial rutile and high production cost of polyferric sulfate in the prior art. Comprising the following steps: pretreatment of titanium dioxide primary washing waste acid, reduction pretreatment of ilmenite, preparation of artificial rutile by leaching refined waste acid and reduced ilmenite, recovery of high-iron-content mother liquor, preparation of polyferric sulfate by oxidation-polymerization of the mother liquor, and cyclic utilization of washing water. The grade of the prepared artificial rutile TiO2 is greater than or equal to 92%, and the polyferric sulfate meets the national standard requirement; the waste acid resource utilization rate is larger than or equal to 98%, the comprehensive cost of the two products is reduced by 25-30%, and the method is suitable for waste resource utilization and fine chemical product collaborative production of sulfuric acid method titanium dioxide enterprises.

The invention relates to the technical field of solid waste treatment and resource utilization, in particular to an environment-friendly curing agent, sludge solidified soil and a preparation method of the sludge solidified soil. The environment-friendly curing agent is prepared from the following components: desulfurized fly ash, mineral powder, cement, sodium hypochlorite and polyferric sulfate. The sludge solidified soil is prepared from the following components: sludge, an environment-friendly curing agent and water. The environment-friendly curing agent prepared by adopting the technical scheme is used for curing water-containing sludge, the 28-day strength of a cured body of obtained sludge cured soil exceeds 2MPa, and the anti-permeability coefficient can reach 5.2 * 10 <-9 > cm / s. According to the technical scheme, the obtained sludge solidified soil is good in shrinkage resistance and water stability; the setting time is short, the strength development is fast, and the strength period is long; the anti-permeability is high, and the durability is good; according to the technical scheme, the environment-friendly curing agent replaces cement cementing materials to a large extent, and the economical efficiency is good.

The present application relates to the field of water treatment flocculants, and specifically discloses a chitosan-zinc-rare earth ternary functional composite polymeric ferric sulfate and a preparation method thereof, the preparation method comprising: mixing iron-containing raw materials with acid to form an acid-containing reaction solution; adding chitosan, zinc-containing compounds and rare earth-containing compounds to the reaction solution, controlling the chitosan addition amount to be 0.5% to 5% of the mass of the iron-containing raw materials, the Zn / Fe molar ratio to be 0.03 to 0.12, and the rare earth / Fe molar ratio to be 0.005 to 0.05, and allowing the chitosan to coordinate and combine with iron ions in a catalytic oxidation polymerization process to form a ternary functional composite intermediate; and drying to obtain a solid product. The present application embeds chitosan, zinc and rare earth into the molecular structure of polymeric ferric sulfate through synchronous chemical bonding, realizes molecular-level synergistic effect of the three components, significantly improves the flocculation performance, accelerates the flocculation settling, and can utilize titanium white waste acid resources to produce.

The application relates to the technical field of water treatment, and particularly discloses a high-efficiency landfill leachate treatment process. The high-efficiency landfill leachate treatment process comprises the following steps: pretreatment: adding a coagulant A into landfill leachate, then adding a coagulant B, carrying out sedimentation or subsidence treatment, and obtaining pretreated liquid; the coagulant A comprises polyferric sulfate; the coagulant B comprises polyaluminum chloride, cationic polyacrylamide, modified bentonite and activated carbon; A / O treatment: sequentially passing the pretreated liquid through an anoxic tank and an aerobic tank to obtain treatment liquid A; MBR treatment: carrying out MBR treatment on the treatment liquid A by using an MBR (membrane bioreactor), to obtain treatment liquid B; and DTRO treatment: carrying out DTRO treatment on the treatment liquid B, to obtain purified water. The treatment process is convenient, and the treatment effect on the landfill leachate is good.

The application discloses a multifunctional active slow-release water purification material and a preparation method thereof. The multifunctional active slow-release water purification material is prepared from raw materials including the following components in parts by weight: slow-release material 50-100 parts, bentonite 50-150 parts, microbial bacteria powder 10-20 parts, iron powder 15-40 parts, oxygenation agent 10-20 parts, sodium alginate 10-15 parts, calcium nitrate 10-20 parts and polymeric ferric sulfate 10-15 parts. The raw materials have a high synergistic effect on each other, and are indispensable to jointly control the growth of microorganisms and water purification, form a relatively stable micro system, and have a simple and easy preparation process, no toxic and side effects on organisms and environment, and a good application prospect in water pollution remediation engineering.

The present application relates to the technical field of aquaculture, and particularly relates to a denitrification agent for aquaculture and a preparation method thereof, which comprises the following raw materials in 100% by weight: modified polymeric ferric sulfate 24-26%, iron hydroxide 36-38%, polymeric aluminum ferric silicate 1.5-2%, calcium supplement 3-3.5%, and the rest is maifanite powder. The denitrification agent has a good water improvement effect, and can effectively remove pathogenic bacteria in water for a long time.

The invention relates to a method for producing polyferric sulfate by using mine waste liquid, which comprises the following steps: S1, adding a certain amount of iron powder into mine leaching waste liquid, adjusting the pH value to 1-2, and filtering to obtain a stock solution; s2, adding the filtered stock solution into a reaction kettle, starting stirring, raising the temperature to 70-80 DEG C, and performing negative pressure evaporation for volume concentration; s3, stopping concentration when the concentration density of the feed liquid reaches 1.45 g / cm < 3 >, closing the negative pressure vacuum device, and adding a certain amount of catalyst; s4, continuously stirring, introducing air as an oxidizing agent, converting into positive pressure operation, controlling the temperature within the range of 40-60 DEG C, and oxidizing the feed liquid; s5, after the oxidation reaches the end point, continuously stirring, maintaining the positive pressure operation, introducing air, raising the temperature to 80-100 DEG C, and polymerizing for a certain time to obtain liquid polymeric ferric sulfate; and S6, carrying out spray drying on the polymerized feed liquid to obtain a solid polymeric ferric sulfate product. According to the invention, the production efficiency is improved, the cost is reduced, the generation of pollutants is reduced, and the cooled and recycled sulfuric acid can be reused in a wet copper smelting system.