86 results about "Polyferric sulfate" patented technology

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 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.

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 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.

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 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 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 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 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.

This invention discloses a resource-based treatment process for kitchen waste wastewater, belonging to the technical field of kitchen waste resource utilization. The treatment process provided by this invention includes: adding a ferrate composite oxidant to the kitchen waste wastewater for simultaneous alkali adjustment and oxidation; adding bio-iron or chemically produced polyferric sulfate for reaction; and then adding denitrifying bacteria for nitrogen removal. The treatment process provided by this invention has simple operation steps and low treatment costs, representing a resource-based treatment process for kitchen waste that turns waste into treasure. After treatment, the kitchen waste wastewater has a COD ≥ 50000 mg / L, significantly reduced total nitrogen and total phosphorus content, increased content of small-molecule organic matter, and increased biodegradability, meeting the carbon source requirements of wastewater treatment plants and can be used as a carbon source for wastewater treatment plant carbon replenishment.

The present application provides a kind of medicament for treating waste water containing perchlorate, it consists of two parts of targeted removal agent and guide activator, the core component of the targeted removal agent includes dodecyl trimethylammonium chloride, dodecyl dimethyl benzyl ammonium chloride, hexadecyl trimethylammonium chloride, octadecyl trimethylammonium chloride and the like.The guide activator includes one or more of polymeric ferric sulfate, polymeric ferric chloride, polymeric aluminum ferric chloride, polymeric aluminum ferric silicate.The treatment medicament component of the present application is simple, wherein a large number of high perchlorate ion groups contained therein can be fully combined with perchlorate in waste water, and perchlorate is precipitated from water in the form of precipitation, and then separated and removed, with a removal rate of more than 95% in one step.

The application discloses a kind of flocculants filtration and residue removal systems, including liquid preparation component, filter component and buffer pool, the liquid preparation component is located above the filter component, the liquid outlet of the liquid preparation component is communicated with the liquid inlet of the filter component;The filter component is located above the buffer pool, the liquid outlet of the filter component is communicated with the inlet of the buffer pool.The remarkable effect of the application is that the residue in the polymeric ferric sulfate flocculation solution stock solution can be filtered and removed online, avoid the residue accumulation to cause flocculant dosing pipeline blockage, ensure the supply of flocculant;At the same time, it is not necessary to arrange artificial residue removal operation, reduce the labor cost, and exclude potential safety risk.

The utility model relates to sewage treatment dosing technical field, and disclose a gravity flow automatic dosing device, include: jar body, top plate, top plate fixed mounting in the top of jar body. The utility model discloses through jar body, drive motor and stirring subassembly etc. Structure mutual cooperation, when using, can utilize drive motor drive stirring subassembly in the driving gear, driven gear, spindle and stirring blade collaborative operation, the polymeric ferric sulfate etc. Pharmaceutical solution in jar body is fully and comprehensively stirred, in this way, effectively solved the problem that the solute precipitated in the jar body bottom because of the slow solution adding speed, long standing time when the pharmaceutical preparation and storage, avoided the precipitation to reduce the solution concentration uniformity, influence pharmaceutical dosing accuracy, and the situation that the precipitation accumulation reduces jar body effective volume, reduces the device operating efficiency, guaranteed the consistency of solution concentration, improved the overall operation efficiency of dosing device.

This invention provides the application of polyferric sulfate in improving plant salt stress resistance and / or improving saline-alkali land, belonging to the field of agricultural technology. The polyferric sulfate application provided by this invention can effectively improve the germination ability of plant seeds under salt stress, effectively enhance the activity of plant antioxidant systems and photosynthetic efficiency, thereby effectively improving the survival rate and growth performance of plants under salt stress. Simultaneously, polyferric sulfate can effectively reduce the EC value of saline-alkali soil, thereby effectively improving the germination rate of plant seeds in saline-alkali land and effectively improving saline-alkali land. This invention is simple to operate, low in cost, and environmentally friendly, suitable for enhancing the salt and alkali tolerance of plants, and has broad application prospects.

The present application belongs to the field of waste gas treatment, and particularly relates to a preparation method of a red mud-based mercury and sulfur removal material. A solution containing red mud, a carbonate, a selenium source, an additive and an auxiliary agent is modified by aging, and then solid-liquid separation is performed to obtain the red mud-based mercury and sulfur removal material. The auxiliary agent includes at least one of ferric chloride, ferrous sulfate and polyferric sulfate. The present application also includes the red mud-based mercury and sulfur removal material prepared by the preparation method and the application of the material in mercury and sulfur removal. The carbonate, the selenium source, the additive and the auxiliary agent are used to modify the red mud innovatively, so that the characteristics of the red mud can be fully utilized, the network structure and the active sites of the adsorption material can be synergistically endowed and optimized, and the exposure characteristics of the active sites can be improved, thereby improving the simultaneous removal effect of the prepared red mud-based material on sulfur dioxide and mercury.

The application provides a utilization method of caustic washing waste liquid of an acid pickling line and a waste liquid treatment device. The utilization method comprises the following steps: performing primary neutralization on acid-containing waste water to obtain primary neutralized waste water; performing secondary neutralization on the primary neutralized waste water, and adding caustic washing waste liquid in the process of the secondary neutralization to obtain secondary neutralized waste water; adding polymeric ferric sulfate and polyacrylamide in the secondary neutralized waste water to perform clarification to obtain clarified waste liquid; and performing pH adjustment and filtration on the clarified waste liquid to obtain water to be concentrated and treated. The caustic washing waste liquid is added into a second neutralization tank, and the OH ‑ There is no significant decrease, and the silicic acid in the caustic washing waste liquid added in the secondary neutralization is in a monomer dispersed state. The silicic acid monomer in the caustic washing waste liquid acts as a coagulant aid and cooperates with the polymeric ferric sulfate and the polyacrylamide to perform clarification. The caustic washing waste liquid has a coagulant aid effect, realizes the effect of treating waste with waste, and makes the waste water treatment efficient, low in cost, and environmentally friendly.

The invention provides a method and system for removing total phosphorus and fluoride in stainless steel wastewater, and the method comprises the following steps: carrying out flocculent precipitation treatment on the stainless steel wastewater by using a composite flocculant to obtain a primary treatment liquid; and conveying the primary treatment liquid to an adsorption tower provided with a modified ternary composite filler for adsorption treatment to obtain a secondary treatment liquid. According to the method and the system for removing total phosphorus and fluoride in the stainless steel wastewater provided by the invention, phosphate, fluoride and heavy metal ions in the stainless steel wastewater can be synchronously adsorbed by utilizing the composite flocculant obtained by compounding the polyaluminum sulfate solution and the polyferric sulfate solution; residual total phosphorus and fluoride can be efficiently removed by utilizing the synergistic effect of activated aluminum oxide, graphene and ferroferric oxide in the modified ternary composite filler through a multi-element synergistic mechanism of adsorption, ion exchange and complex reaction.

The invention discloses a method for synergistically dehydrating oil tanker tank washing water sludge by oxidizing poly-iron with ozone, and belongs to the technical field of sludge treatment and environmental engineering, the method comprises the following steps: S10: adding ozone into the oil tanker tank washing water generated sludge to carry out oxidation pretreatment so as to destroy the colloid structure of the sludge and release internal bound water; s20, a polymeric ferric sulfate solution is added into the sludge subjected to oxidation pretreatment for a coagulation reaction, and sludge particles are promoted to be agglomerated to form sludge flocs through electric neutralization and adsorption bridging effects; and S30, carrying out vacuum filtration and dehydration on the sludge floc to obtain dehydrated sludge. Through ozone oxidation pretreatment, a stable colloid and an emulsified film formed by'oil-surface activity-solid 'are destroyed, so that the dehydratability of the oily sludge is fundamentally improved; subsequently adding a polymeric ferric sulfate solution, and agglomerating fine particles into a compact floc under the action of electric neutralization and adsorption bridging; and finally, deep dehydration is realized through vacuum filtration, so that the specific resistance and the water content are remarkably reduced.

The utility model relates to the field of continuous filtering devices, in particular to a continuous filtering device for liquid polyferric sulfate, which comprises a base ring frame, a filtering tank, a tank cover, a hard supporting leg, an elastic supporting leg, a movable disc and a cleaning brush, according to the utility model, the circular-truncated-cone-shaped bearing frame consisting of the base ring frame, the hard supporting legs, the elastic supporting legs and the movable disc can provide stable support for the filtering tank, so that the filtering tank is prevented from toppling over during working, and the elastic supporting legs can be deformed to buffer the filtering tank to a certain extent, so that the filtering tank is prevented from falling off. A hydraulic cylinder can push two groups of movable discs to drive a cleaning brush to clean scale in the filtering tank along the inner wall of the filtering tank, so that the filtering effect of filtering sand in the filtering tank is ensured, and the problems that when existing continuous active sand filtering equipment is used, the scale on the inner wall of a tank body is difficult to clean, and the service life of the filtering tank is prolonged are solved. And the stability of the tank body equipment is poor.

The utility model discloses a kind of high-concentration hemicellulose wastewater treatment systems, it is related to high-concentration hemicellulose wastewater treatment technical field, including the adjusting pool, fenton reaction pool, fenton sedimentation tank, multistage hydrolysis acidification pool and lifting pool connected in order, the adjusting pool water inlet is connected with high-concentration hemicellulose wastewater pipeline, non-ferrous wastewater pipeline and acidic wastewater pipeline, adjusting pool and fenton reaction pool between being provided with dispensing room, and ferrous sulfate storage tank, hydrogen peroxide storage tank and PAM storage tank are provided in dispensing room, ferrous sulfate storage tank and hydrogen peroxide storage tank are connected with fenton reaction pool water inlet respectively, and PAM storage tank is connected with fenton reaction pool, fenton reaction pool is also connected with alkali tank, the fenton sedimentation tank bottom is provided with sludge pump, and the lifting pool water outlet is connected with polymeric ferric sulfate storage tank. Through pre-fenton system combination multistage anaerobic treatment unit realizes the efficient decomposition of hemicellulose, lignin and other refractory substances, and cooperates subsequent advanced treatment to ensure that effluent COD is stable and up to standard.

The invention discloses a novel polyferric sulfate and silica gel sand reinforced waste lubricating oil purification method, and belongs to the technical field of waste mineral oil resource utilization and oil refining chemical engineering. The method comprises the following steps: heating and dehydrating the waste lubricating oil, and acidizing with concentrated sulfuric acid to remove colloidal impurities; adding polyferric sulfate into the treated oil liquid to serve as a flocculating agent so as to promote settling separation of suspended impurities; and after activated clay is used for adsorbing and removing impurities, silica gel sand is added for refining and decoloring, so that the purity and transparency of the oil product are remarkably improved. Through the synergistic effect of polymeric ferric sulfate and silica gel sand, the method can effectively enhance the impurity removal and decolorization capability. Experimental results show that the light transmittance of the treated lubricating oil is increased to 77-82%, the kinematic viscosity at 40 DEG C is reduced to 51-64 mm / s, the density is 0.808-0.829 g / cm < 3 >, and the total metal content and the chlorine content are respectively reduced to 63.4 mu g / g and 31.8 mu g / g. The method is simple and convenient in process and moderate in cost, has remarkable environmental and economic benefits, and is suitable for recycling the waste lubricating oil.

This invention discloses a method for producing a composite water treatment agent. It uses a poly(N-isopropylacrylamide-acrylic acid) copolymer as a temperature- and pH-responsive wall material, encapsulating a flocculant core composed of polyferric sulfate and polysilicic acid. After dopamine biomimetic modification, urease is covalently grafted onto the core, which is then combined with sodium alginate and spray-granulated. By setting response thresholds of 18-38℃ and pH 7.0-8.5, precise flocculant dosing is achieved. The method utilizes a synergistic and reversible response sequence of "response-flocculation-pH drop activating enzyme degradation-sedimentation" to correct water quality mismatches, solving problems of inaccurate dosing and residual pollution. This method is suitable for municipal wastewater and industrial cooling water treatment.

The invention relates to the technical field of solid waste recycling, and discloses a method for preparing a water purifying agent from lithium extraction tailings and the prepared water purifying agent, quartz, feldspar and magnetic minerals are separated by a physical separation method through an impurity removal and extraction technology of selective purification, activated calcination, acid leaching polymerization and composite blending, and an iron-containing clay phase is reserved; the PAC-PPS-porous silica gel composite system water purifying agent with an efficient water purifying effect is obtained by calcining and activating kaolin, removing hydroxyl and converting into metakaolin, carrying out controllable acid leaching to avoid excessive purification of iron ions, and finally, carrying out composite blending to obtain the PAC-PPS-porous silica gel composite system water purifying agent with an efficient water purifying effect. According to the method, the lithium extraction tailings are creatively used as the raw material, and the iron-containing ore phase and the iron element are reserved as far as possible, so that the flocculation capacity of the water purifying agent is improved, and the water purifying effect is improved; amorphous silicon dioxide filter residues and polymeric ferric sulfate are added step by step, the pH is adjusted in stages, and PAC, PFS and amorphous silicon dioxide are compounded for use, so that the water purification effect of the water purifier is further enhanced.

The present application relates to the control of lead-zinc mine tailings heavy metal pollution stabilizer and its application method, the stabilizer includes basic component A and reinforcing component B;Wherein basic component A is polyaluminum chloride iron 35%~50%, polyferric sulfate 10%~12%, calcium hydroxide 20%~50%, calcium carbonate 10%~30%, iron oxide 0.1%~2.0%;Reinforcing component B is sodium silicate.Polyaluminum chloride iron, polyferric sulfate, calcium hydroxide, calcium carbonate, iron oxide are mixed uniformly, activated, namely the basic component A;Reinforcing component B is used into the concentration 0.1~3.0% aqueous solution.The raw material of the present application is rich, low cost, high efficiency environmental protection, can realize the solidification stabilization to the heavy metal pollutants in lead-zinc mine tailings, significantly reduces the leaching of heavy metals in tailings.

The invention relates to the technical field of aquaculture, in particular to a denitrification agent for aquaculture and a preparation method thereof, and the denitrification agent is prepared from the following raw materials in percentage by weight: 24-26% of modified polyferric sulfate, 36-38% of ferric hydroxide, 1.5-2% of polyaluminum ferric silicate, 3-3.5% of calcium supplement and the balance of medical stone powder. The nitrogen removal agent disclosed by the invention has a relatively good water body improvement effect and can effectively remove pathogenic bacteria in a water body for a long time.