284 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 provides an impurity removal and recovery method of electrodeposited nickel anolyte, which comprises the following steps: (1) mixing the electrodeposited nickel anolyte with liquid caustic soda, carrying out solid-liquid separation to obtain nickel hydroxide and filtrate, and evaporating the filtrate to obtain sodium sulfate; mixing the electrodeposited nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt, and carrying out lead removal treatment; (3) adjusting the pH value of a material obtained after lead removal treatment by using nickel hydroxide to obtain a solution to be subjected to arsenic removal, and mixing the solution to be subjected to arsenic removal with polyferric sulfate for arsenic removal treatment; and (4) a material obtained after arsenic removal treatment is mixed with an oxidizing agent, a solution to be subjected to iron removal is obtained, solid-liquid separation treatment is conducted on the solution to be subjected to iron removal, catholyte with lead, arsenic and iron removed and iron-containing slag are obtained, sodium sulfate is supplemented into the catholyte with lead, arsenic and iron removed, and the catholyte is reused in the nickel electrodeposition process. According to the method, lead, arsenic and iron in the electrodeposited nickel anolyte can be efficiently and rapidly removed and recycled.

The invention discloses a tea polyphenol modified polyferric flocculant as well as a preparation method and application thereof, and belongs to the field of anaerobic fermentation biogas slurry dehydration. Polyferric sulfate is used as a chain main body, tea polyphenol is used as a cross-linking agent, the tea polyphenol and iron ions in the polyferric sulfate form chelating coordination bonds under an alkaline condition, and the polyferric sulfate modified polyferric flocculant is prepared. Meanwhile, hydrophilic ether oxygen bonds in polyethylene oxide are combined with phenolic hydroxyl groups to form hydrogen bonds, so that a three-component polymer network is formed. Compared with the conventional flocculant, the modified polyferric flocculant prepared by the invention has the advantages that the electrical neutralization capability is enhanced, the adsorption bridging capability and the net repair sweeping capability of the flocculant are improved through coordinate bonds and hydrogen bonds, the floc forming rate is higher, the floc is larger and higher in strength, the sedimentation rate is higher, and the turbidity and the organic matter removal rate are high.

The invention relates to the technical field of water treatment, and provides an efficient chitosan-polyferric sulfate composite coagulant and a preparation method thereof. In order to solve the problems that a traditional inorganic coagulant is prone to secondary pollution, an organic coagulant is high in cost and complex in process control and the like, the invention provides a solution that natural chitosan serves as a raw material, the charge characteristic of the natural chitosan is enhanced through quaternary ammonium salt modification, and then the natural chitosan is compounded with the inorganic coagulant according to a specific proportion. The preparation method comprises the following steps: dissolving chitosan in a 2% acetic acid solution, adjusting the pH value to weak acidity, introducing quaternary ammonium salt, carrying out catalysis by an initiator at a constant temperature of 70 DEG C to complete a reaction, and carrying out centrifugal washing and vacuum drying to obtain modified chitosan; and then compounding with an inorganic coagulant according to a mass ratio of 1: (3-5) to form a composite system with charge neutralization and adsorption bridging functions. According to the invention, by accurately controlling the ratio of the components and process parameters, the preparation process is simple and controllable, and the obtained composite coagulant has the characteristics of high treatment efficiency, environmental friendliness and moderate cost.

The invention discloses a method and device for reducing tail water plume of a deep-sea mining vehicle. The device comprises a crushing device, a liquid storage device, a centrifugal action device, an intelligent control device, a magnetic seed laying and recycling device and a super-magnetic separation device. The crushing device comprises a crusher, the liquid storage device comprises a liquid storage tank and a control valve, the liquid storage tank comprises a coagulant aid liquid storage tank and a coagulant liquid storage tank, the centrifugal action device comprises a centrifugal machine, a magnet, a liquid conveying pipe and a magnetic seed dispenser, and the centrifugal action device screens particles with different diameters in a water body to different layers through centrifugation. Under the action of the magnet, the magnetic field intensity in each layer is different, and the magnetic seeds with different particle sizes are combined with particle impurities in seawater under the action of a coagulant aid coagulant, so that a better flocculation effect is realized. Polyferric sulfate is adopted as a coagulant and can be used for treating heavy metal ions in water, polyacrylamide is adopted as a coagulant aid, suspended solids and colloidal particles in water can be effectively captured and adsorbed, and sedimentation and separation of the suspended solids and colloidal particles are promoted.

The invention belongs to the technical field of metal recovery, and discloses a method for recovering indium from indium-containing acidic waste liquid, which comprises the following steps: adding an alkaline solution into the indium-containing acidic waste liquid until the pH value is 8-14 to obtain an intermediate liquid I, adding a flocculating agent into the intermediate liquid I, and carrying out filter pressing to obtain filter residues; the flocculating agent is selected from at least one of polyacrylamide, polyaluminum chloride, polyferric sulfate, polyferrous sulfate and polyaluminum sulfate, the reducing agent is selected from at least one of graphite powder, coke and anthracite, the flocculating agent is selected from at least one of sodium hydroxide, sodium hydroxide and sodium hydroxide, and the reducing agent is selected from at least one of sodium hydroxide, sodium hydroxide and sodium hydroxide. According to the method, indium in the indium-containing acidic waste liquid is preliminarily settled by adjusting the pH value, and then part of residual metal indium with positive charges is further settled and gathered by using the flocculating agent, so that the recovery rate of indium is increased.

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 method for synergistically recycling rare earth-containing coal mine acid wastewater and coal gangue, and relates to the technical field of comprehensive utilization of mineral resources, the method mainly comprises the following steps: S1, arranging a rare earth-rich coal gangue dump leaching field and building a heap; s2, spraying the rare earth-containing coal mine acid wastewater and collecting leachate; s3, separation and enrichment of rare earth elements; and S4, carrying out high-valued treatment on resources such as iron and aluminum in the residual solution. According to the method, valuable resources such as rare earth in the rare-earth-containing coal mine acid wastewater and the rare-earth-rich coal gangue are synergistically recycled, meanwhile, treatment of the coal mine acid wastewater and preparation of the polymeric ferric aluminum sulfate are achieved, the concept of maximum value of comprehensive utilization of resources is achieved, and the treatment process is low in cost and little in environmental pollution.

The invention relates to the technical field of sewage treatment, in particular to a polymeric ferric sulfate processing and feeding device and method for sewage treatment. Comprising a sewage tank, a rotating motor is arranged at the end of the sewage tank, a lead screw is arranged at the output end of the rotating motor, a moving seat is arranged on the surface of the lead screw, pressing rods are arranged on the two sides of the moving seat, the ends of the pressing rods extend to the outer wall of the sewage tank, and a mixing assembly is arranged below the pressing rods. When the moving seat moves, the pressing rod is driven to press the top of the pressing head, the pressing head pushes the sliding rod to slide on the inner wall of the column casing and extrude water in the column casing, the water is sprayed out through the top of the spraying disc, and the nearby water is impacted while the water is sprayed; and when the spraying discs sequentially impact sewage in the sewage tank, increased impact force exists between the wastewater, so that the sewage is mixed, and the mixing efficiency of the sewage and the polymeric ferric sulfate medicament is improved.

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 coagulant for industrial wastewater treatment and a preparation method thereof, and belongs to the technical field of water treatment.The coagulant comprises a main flocculant and an auxiliary flocculant, the main flocculant is polyferric sulfate and / or polyaluminum chloride, and the auxiliary flocculant is organic modified diatomite; the organic modified diatomite is prepared by condensing aminated diatomite and a carboxylation modifier; the aminated diatomite is diatomite treated by an aminated silane coupling agent. The auxiliary flocculant not only has a porous characteristic, active functional groups on the surface can adsorb metal cations, and the auxiliary flocculant can be integrally used as a crystal nucleus to promote growth and aggregation of other precipitates (such as ferric hydroxide, aluminum hydroxide and the like) on the surface, so that the precipitation process is accelerated, the removal efficiency of pollutants in wastewater is improved, and the wastewater treatment effect is improved. The effect of enhancing coagulation is achieved.

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 discloses a kitchen waste wastewater resourceful treatment process, and belongs to the technical field of kitchen waste resourceful utilization. The treatment process provided by the invention comprises the following steps: adding a ferrate composite oxidant into the kitchen waste wastewater to carry out alkali adjustment and oxidation synchronous treatment, adding biological iron or chemical polyferric sulfate to react, and then adding denitrifying bacteria to carry out denitrification treatment. The treatment process provided by the invention is simple in operation steps and low in treatment cost, and is a kitchen waste resourceful treatment process capable of turning waste into wealth. The COD (Chemical Oxygen Demand) of the treated kitchen waste wastewater is greater than or equal to 50000 mg / L, the content of total nitrogen and total phosphorus is obviously reduced, the content of small molecular organic matters in water is increased, the biodegradability is improved, the requirement of a sewage treatment plant for supplementing a carbon source is met, and the treated kitchen waste wastewater can be used as a carbon source for supplementing the carbon source for the sewage treatment plant.

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 provides a medicament for treating wastewater containing perchlorate, which consists of two parts, namely a targeted remover and a guide activator, the core components of the targeted remover comprise dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride and the like. The guiding activating agent comprises one or more of polyferric sulfate, polyferric chloride, polyaluminum ferric chloride and polyaluminum ferric silicate. The treatment agent is simple in component, a large number of perchlorate-loving ion groups contained in the treatment agent can be fully combined with perchlorate in wastewater, the perchlorate is separated out from water in a precipitation mode and then is separated and removed, and the one-step removal rate reaches 95% or above.

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 invention relates to a landfill leachate pretreatment hardness removal process and a landfill leachate pretreatment hardness removal system, which are specifically characterized in that at the front end of landfill leachate anaerobic reaction treatment of a landfill power plant, landfill leachate raw water and alkaline anaerobic reactor reflux water are fully mixed, the pH value of the mixed liquid is monitored in real time, and the reflux quantity of an anaerobic reactor is adjusted in real time, so that the landfill leachate is subjected to alkali adjustment treatment (pHgt; 7.5), then adding sodium carbonate to generate calcium and magnesium precipitates, then adding polymeric ferric sulfate, activated sludge and polyacrylamide to improve the precipitation effect, enabling the effluent to selectively pass through sand filtration to further remove the calcium and magnesium precipitates in the leachate, and removing the calcium and magnesium precipitates in the leachate subjected to hardness removal treatment, the leachate can be further treated by adopting an anaerobic-AOAO-membrane treatment method. The invention provides a device based on the process, the problems of high cost and the like of hardness removal by a dual-alkali method are solved, the activity of anaerobic sludge and aerobic sludge in the later period can be improved, and the service life of a membrane device is prolonged.

The invention discloses a waste gas spray tower in polyferric sulfate production, which comprises a tower body, the front side of the tower body is fixedly connected with a gas inlet pipe, the upper side of the tower body is fixedly connected with a gas outlet pipe, the left side of the tower body is fixedly connected with an observation window, the right side of the tower body is fixedly connected with a water pump, and the inner side of the tower body is provided with a spray unit. The spraying unit comprises a first fixing ring, the first fixing ring is fixedly connected to the inner side of the tower body, a guide groove is formed in the lower side of the first fixing ring, and a guide block is slidably connected to the inner side of the guide groove. According to the waste gas spray tower in the production of the polymeric ferric sulfate, through the arrangement of a first fixing ring, a guide groove, a guide block, a first annular pipe, a connecting pipe, a first spray head, a second spray head, a treatment barrel, a dispersion plate and dispersion holes, rotation of the annular pipe, the connecting pipe and the dispersion plate is conveniently controlled, introduced waste gas is dispersed, the waste gas is distributed more uniformly, and the waste gas treatment effect is improved.

The invention relates to a microbial water body substrate modifier and application thereof. The microbial water body substrate modifier comprises the following components: compound microbial powder, zeolite powder, shell powder and polyferric sulfate, the compound microbial powder comprises bacillus powder and lactic acid bacteria powder. The microbial water substrate modifier can effectively realize rapid bottom modification of aquaculture water, improve water quality, optimize aquaculture environment, reduce diseases and promote healthy growth of aquaculture animals. Wherein the bacillus can flocculate and settle residual organic matters such as feed, animal waste and the like in the culture water body by utilizing the flocculation effect of the bacillus, and the physical adsorption components, namely the zeolite powder and the shell powder, and the chemical adsorption component, namely the polyferric sulfate are synergistically matched, so that suspended organic matter large particles in the water body are effectively adsorbed and settled; and the organic matters are jointly degraded through the common graded degradation effect of the bacillus and the lactic acid bacteria, so that the effects of improving the substrate of the aquaculture water body and promoting the healthy growth of the aquaculture animals are achieved.

The utility model relates to the technical field of polyferric sulfate production, and discloses a high-purity polyferric sulfate drying device which comprises a drying box body and a stirring mechanism, the inner wall of the drying box body is sleeved with a driving shaft, the outer wall of the driving shaft is sleeved with a square placement frame, the outer wall of the square placement frame is fixedly connected with a pushing plate, and the pushing plate is fixedly connected with a stirring mechanism. A plurality of limiting sliding rods are arranged on the inner wall of the pushing plate and distributed on the inner wall of the pushing plate in a linear array shape. According to the high-purity polyferric sulfate drying device, the stirring mechanism is arranged in the drying box body, so that when the device works, a driving motor drives a driving shaft to drive a square placement frame to rotate, the device can stir ferric sulfate accumulated in the drying box body, and then the situation that the ferric sulfate is difficult to dry is reduced; and the drying efficiency of the heating lining on ferric sulfate accumulated in the drying box body is improved.

The invention provides a perchlorate wastewater treatment agent which consists of two parts, namely a targeted remover and a guide activator, the core components of the targeted remover comprise octyl trimethyl ammonium chloride, trioctyl methyl ammonium chloride, benzyl trimethyl ammonium chloride, decyl trimethyl ammonium chloride, didecyl dimethyl ammonium chloride, dodecyl trimethyl ammonium bromide, dodecyl dihydroxyethyl methyl ammonium chloride, tetradecyl trimethyl ammonium chloride and the like. The guiding activating agent comprises one or more of polyferric sulfate, polyferric chloride, polyaluminum ferric chloride and polyaluminum ferric silicate. The treatment agent is simple in component, a large number of perchlorate-loving ion groups contained in the treatment agent can be fully combined with perchlorate in wastewater, the perchlorate is separated out from water in a precipitation mode and then is separated and removed, and the one-step removal rate reaches 95% or above.

The invention provides a method for utilizing alkali washing waste liquid of a pickling line and a waste liquid treatment device. The utilization method comprises the following steps: carrying out primary neutralization on the acid-containing wastewater to obtain primary neutralized wastewater; and performing secondary neutralization on the primary neutralized wastewater, and adding alkali washing waste liquid in the secondary neutralization process to obtain secondary neutralized wastewater. And adding polyferric sulfate and polyacrylamide into the secondary neutralized wastewater to clarify to obtain clarified waste liquid. The clarified waste liquid is subjected to pH adjustment and filtration, and then water to be treated in a centralized mode is obtained. The alkali washing waste liquid is added into the second neutralization tank, after the alkali washing waste liquid is added, OH <-> is not greatly reduced, and silicic acid in the alkali washing waste liquid subjected to secondary neutralization is in a monomer dispersed state. The silicic acid monomer in the alkali washing waste liquid is used as a coagulant aid and cooperates with polyferric sulfate and polyacrylamide to clarify. The alkali washing waste liquid has a coagulation aiding effect, so that the effect of treating waste with waste is realized, and the wastewater treatment is efficient, low in cost and environment-friendly.

The high-purity polymeric ferric sulfate gas-liquid separation device comprises a supporting assembly, a lower separation assembly, an upper separation assembly and a fixing assembly, the supporting assembly comprises a support, a first groove and a second groove, the first groove and the second groove are formed in the top end of the support, and the lower separation assembly comprises a lower separation tank arranged on the inner side of the support. The upper separation assembly comprises an upper separation tank inserted in the lower separation tank, an exhaust pipe arranged at the top end of the upper separation tank, a corrugated pipe arranged on the exhaust pipe, a liquid inlet pipe arranged at the front end of the upper separation tank and a hose arranged on the liquid inlet pipe; the fixing assembly comprises a screw rod arranged on the outer side of the upper separation tank, a fastening knob in threaded connection with the screw rod and a grip arranged on the screw rod. Through the arrangement of the supporting assembly, the lower separation assembly, the upper separation assembly and the fixing assembly, the rapid separation effect is achieved under the condition that a pipeline does not need to be disassembled, and the interior of the device is convenient to maintain or clean.

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.