239 results about "Iron(III) sulfate" patented technology

The invention discloses a high polymer composite coagulant for disposing oily wastewater and preparing method, which comprises the following steps: setting ingredient and weight ratio of high polymer composite coagulant with polymeric aluminium chloride : polymeric ferric sulfate : soluble glass : polydiene propyl dimethyl amchlor : water = 39.00:(1.90-2.10):(0.26-0.31):(1.04-1.52):(57.80-57.10); setting 0.02% basic ion polyacrylamide in polydiene propyl dimethyl amchlor; preparing finite density water solution with raw material as first step; preparing flocculant intermediate with polyaluminium chloride, polymeric ferric persulfate and sodium silicate as second step; proceeding mixed reaction with flocculating agent intermediate of the second step and polydiene propyl dimethyl amchlor of 0.02% positive ion polyacrylamide; controlling condition as temperature at 70-90 deg.c, pH value at 4-7; stirring intensity at 50-70r/min and ripening time at 6-24h.

The invention discloses a preparation method of battery-grade iron phosphate. The preparation method comprises the following steps: preparing a ferrous sulfate solution of which the mass percent of iron is 5.0-10.0%, adding an oxidizing agent and H3PO4 for oxidizing Fe <2+> into Fe <3+> to form a mixed solution of phosphoric acid and ferric sulfate, adding water to adjust the pH value to 1.5-2.5,performing a reaction to obtain iron phosphate precipitate, and washing, filtering, and drying and calcining a filter cake to obtain battery-grade iron phosphate. According to the invention, reactionpH is adjusted through pure water dilution; instead of adjusting the pH by ammonia water in a conventional route the product quality can be ensured and implementation of zero emission of ammonia nitrogen is achieved; no solid by-product is generated, the prepared battery-grade iron phosphate material is low in impurity content, dilute sulfuric acid in wastewater can be recycled through concentration, condensate water generated by heating evaporation can also be recycled for diluting and adjusting the pH value of a phosphoric acid and ferric sulfate mixed solution, zero emission of wastewater is achieved, and energy consumption and production cost are reduced.

The invention discloses a preparation method of polymeric aluminum ferric sulfate. The preparation method comprises the following steps of: with ferrous sulfate heptahydrate as industrial waste of titanium white as a main raw material, adding water to dissolve and adding concentrated sulfuric acid to acidize; then adding industrial aluminum sulfate to heat and stir under the condition that the bath temperature is 60-100 DEG C; stirring and adding concentrated nitric acid to oxidate; and carrying out polymerization for 30-60 min to obtain the polymeric aluminum ferric sulfate. The preparation method has the advantages of simple process, low cost and short reaction period. The flocculation performance of the polymeric aluminum ferric sulfate is better than that of the traditional industrial product and can be widely applied to feed water treatment and sewage treatment.

An economical environmental-friendly composite fertilizer containing active sludge is disclosed. The fertilizer is characterized in that: the fertilizer is prepared from following raw materials by weight in part: 55-59 of oil tea cake, 40-44 of peanut bran, 39-43 of paulownia saw dust, 40-45 of straw powder, 50-55 of chicken manure, 9-11 of kaolin, 3-5 of humic acid, 2-4 of fern root powder, 7-9 of an EM bacterial agent, 8-9 of potassium salt of fulvic acid, 1-2 of ferric sulfate, 20-24 of the active sludge, 10-14 of calcium superphosphate, 25-29 of urea, 6-8 of a soil conditioning agent and a proper amount of water; the fertilizer is economical and environmental friendly; the active sludge is fermented into organic fertilizers and is cooperated with inorganic element fertilizers, the fertilizer efficacy is good, and the fertilizer can increase the crop yield and effectively improve the soil quality; the soil conditioning agent is added, and therefore the fertilizer has functions of promoting efficacy and promoting plant nutrition absorption; and urea melting coating is adopted so that the slow release effects are significant and the fertilizer efficacy is durable.

The invention relates to a method for preparing a metal polysilicate flocculant. At present, the metal polysilicate flocculant is higher in production cost. The method comprises the following steps of: adding green vitriol and waste acid which are produced during production of titanium white into a reaction vessel together with industrial potassium chlorate and stirring to obtain viscous polymeric ferric sulfate; adding water to dilute sodium silicate into sodium silicate aqueous solution, wherein the weight content of SiO2 in the sodium silicate aqueous solution is 2 to 3 percent; adding the waste acid which is produced during the production of the titanium white into the sodium silicate aqueous solution, adjusting pH value of the sodium silicate aqueous solution to be between 3.5 and 4.5, and stirring at normal temperature to obtain polysilicate solution; and adding the polymeric ferric sulfate into the polysilicate solution, uniformly stirring, standing and activating for 10 to 24 hours to obtain the metal polysilicate flocculant. A byproduct produced by the production of the titanium white is low in cost; and the prepared flocculant has the characteristics of high stability, wide application range and good flocculation effect.

The invention discloses a production method of high-purity copper sulphate. The production method of high-purity copper sulphate comprises the following steps of: dissolving industrial grade copper sulphate into ultrapure water, heating to the temperature of 40-70 DEG C, dropwise adding sulphuric acid to regulate pH to be 1.0-2.0, stirring and dissolving, and then adding hydrogen peroxide; mixing polymeric ferric sulphate with basic copper carbonate in a mass ratio of 1: (2.5-4.5) to prepare a precipitation complexing agent, adding the precipitation complexing agent the weight of which is 0.5-2.5wt% of weight of the solution into the insulated solution, then adding activated carbon the weight of which is 0.5-2.5wt% of the weight of the solution, stirring for 3-7 hours, cooling to room temperature, and standing overnight; and carrying out rough filtration on the solution, then filtering with a microporous membrane with the size of 0.2mu m, and concentrating and crystallizing filtrate to obtain high-purity copper sulphate.

The invention discloses a flocculating agent for an impurity removal process of steviol glycosides. The flocculating agent comprises, by weight, 10-20 parts of modified chitosan, 15-25 parts of modified lignin, 30-40 parts of polymeric ferric sulfate, 25-35 parts of aluminium citrate, 10-15 parts of magnesium sulfate, 20-30 parts of polymeric ferric silicate-sulfate, 3-5 parts of porous pearlite powder and 4-6 parts of zeolite powder. A preparation method of the modified chitosan comprises the steps that carboxymethyl chitosan is added into a sodium hydroxide aqueous solution, after heating and heat preservation are conducted, a 3-chloro-2-hydroxypropyltrimethylammonium chloride aqueous solution is dropwise added, the heat preservation is continuously conducted, and then the mixture is adjusted to be neutral to obtain a first material; the first first material is added into ethyl alcohol, filtration is conducted, and a second material is obtained after drying; the second material is added into distilled water to be evenly stirred, water-bath heating is conducted, acrylamide and an initiating agent are sequentially and dropwise added, and a third material is obtained after the heat preservation is conducted; the third material is added into acetone, the filtration is conducted, and the modified chitosan is obtained after drying is conducted.

The invention relates to a combined treatment process for the membrane effluent concentrated solution of urban garbage percolate. In the treatment process, a coagulation sedimentation unit, a photoelectric oxidation unit and an oxidation adsorption filtration unit are provided, wherein the coagulation sedimentation unit removes macromolecular soluble substances from biochemical effluent; by using any one of or compounding two or more of polyaluminum chloride, poly-ferric chloride, aluminum sulfate and ferric sulfate, and adding polyacrylamide serving as a coagulant aid, the removal rate of chemical oxygen demand (COD) is about 30 percent; the photoelectric oxidation unit can effectively remove ammonia nitrogen, total nitrogen and part of nondegradable organic matters, the removal rate of the ammonia nitrogen and the total nitrogen can reach 99 percent after the percolate is treated by the photoelectric oxidation unit, and the concentration of residual COD is between 1,000 and 2,000mg/L; and the oxidation/adsorption unit removes residual organic components and metal ions and has been detailedly described in the patent (200910080596.x). The combined process has the characteristics of small investment, low operating cost and the like, is simply and flexibly operated, is suitable for the innocent treatment of the percolate, and also can be applied to the treatment of salty wastewater with high ammonia nitrogen and organic matter load and large water quality fluctuation.

The invention relates to a comprehensive utilization method of amarillite slag, which is characterized by including the following steps: (1) the valuable metals in the amarillite slag are selectively leached by using sulfuric acid solution, thus obtaining the leaching slag and the leaching agent; (2) the leaching slag and sulphuric acid are mixed then heated under microwave radiation; (3) water and a substance containing iron are added into the material after microwave radiation, quiescence and slaking are carried out at normal temperature condition and (4) the material is heated, ferrous iron in the solution is oxidized by using an oxidant, then the polymerization ferric sulfate is prepared through hydrolysis and polymerization by ferric iron. The invention effectively retrieves the valuable metals in the amarillite slag, reduces reagent consumption and energy consumption during amarillite slag treatment process, shortens the treatment time, has no environmental pollution during the treatment process, obtains the water treatment agent polymerization ferric sulfate with good quality, and can effectively solve the problems of the stockpiling and pollution of the amarillite slag.

The invention discloses a method for producing polymeric ferric sulfate from raw materials industrial waste acid and scrap iron. The polymeric ferric sulfate is a novel inorganic sewage flocculant, is an iron inorganic polymeric flocculant, is high in flocculation force and sedimentation velocity, and has remarkable removal effects on some heavy metal irons, COD (chemical oxygen demand), chromaticity, stink and the like during sewage treatment. An existing polymeric ferric sulfate production method is low in yield and serious in pollution during the production process. The method comprises the following steps: (1) reacting the raw materials, i.e. the waste acid and the scrap iron, to obtain ferrous iron; (2) performing oxidization reaction to obtain ferric iron by adopting potassium chlorate as an oxidant; (3) performing hydrolysis reaction; (4) carrying out a polymerization process of conversion from a low polymer to a high polymer to obtain the polymeric ferric sulfate. By the method, the polymeric ferric sulfate is produced from the raw materials, i.e. the industrial waste acid and the scrap iron.

The invention discloses a method used for preparing polymeric ferric sulfate from sulfuric acid waste liquid. The method comprises following steps: (1) sulfuric acid waste liquid with a concentration ranging from 13 to 23% is delivered into a material tank, green vitriol is added at a H2SO4:FeSO4 ratio of 1:1.6-2, and an obtained mixture is mixed; (2) the mixture is delivered into a sealed reaction vessel, sodium nitrite is added into the reaction vessel slowly for polymerization, wherein each ton of the mixture is provided with 2 to 5kg of sodium nitrite, sodium nitrite is added in three to four times, the pressure of the reaction vessel is maintained to be constant in sodium nitrite adding, oxygen is added, and oxygen adding speed is controlled to as to maintain the pressure of the reaction vessel to be 0.05 to 0.1MPa; and (3) when the temperature of the reaction vessel is increased to 75 to 80 DEG C, sampling is carried out so as to measure the content of green vitriol, and polymeric ferric sulfate finished product is obtained when the content of green vitriol is lower than 0.1%. According to the method, polymeric ferric sulfate is prepared by taking sulfuric acid waste liquid as a raw material, a large amount of resource is saved, the method can be widely applied to waste water treatment of the fields such as chemical engineering, printing, medicine preparation, and town domestic sewage, and wastes are treated with wastes.

The invention discloses a comprehensive utilization method of silicate minerals. The method comprises the following steps: firstly decomposing silicate minerals by using sulfuric acid as a decomposing agent, and carrying out acid leaching of residues for preparation of white carbon black; sending an acidolysis solution into a magnesium sulfate heptahydrate crystallizer to prepare a magnesium sulfate heptahydrate product and an acidolysis solution obtained after separation of magnesium sulfate; mixing magnesium sulfate heptahydrate and water, adding an oxidizing agent, a pH regulator and an adsorbent to convert iron in the solution to a ferric hydroxide precipitate, filtering to obtain a pure magnesium sulfate solution, sending the magnesium sulfate solution into a magnesium sulfate monohydrate powder dedicated preparation system to prepare a feed-grade magnesium sulfate monohydrate product; separating an iron precipitate from the acidolysis solution by an oxidation-precipitation process, carrying out oxidation, carrying out a polymerization reaction, and solidifying to prepare a solid polymeric ferric sulfate product; and sending the acidolysis solution after separation of the iron precipitate to a follow-up process to prepare a magnesium compound. According to the invention, insufficiencies such as high energy consumption during present technical process of production, low product purity and the like are overcome; and there is no emission of ''three wastes (waste gas, waste water and industrial residue) '' during the production process, so as to minimize the influence on the environment.

The invention discloses a method for removing thallium in wastewater. According to the method, ozone is delivered in to thallium-containing wastewater for oxidizing; a mixed flocculating agent is added into the wastewater, wherein the mixed flocculating agent comprises sodium hydroxide, sodium sulfide, polymeric ferric sulfate and sodium polystyrenesulfonate; after flocculation, solid-liquid separation is completed; and a ceramic material is added into a liquid part for adsorption. With the method provided by the invention, chemical agent dose can be reduced; no secondary pollution is caused; and the efficiency is high. The method is suitable for large-scale applications, and the process is simple and controllable. Outlet water quality (thallium content) is stabilized at below 0.005mg/L. The adsorption material can be recycled. The method can be used for carrying out deep treatment upon low-concentration heavy-metal-ion-polluted wastewater.

The invention relates to a method for recycling lithium hydrate from lithium iron phosphate waste, and belongs to the technical field of waste lithium ion battery recycling. The invention provides a method for recycling lithium hydrate from lithium iron phosphate waste, which comprises the following steps: the lithium iron phosphate waste is roasted for 1-4h at the temperature of 500-800 DEG C; sulfuric acid is added into the roasted material for leaching, and the mixed solution of lithium phosphate, ferric phosphate and ferric sulfate is obtained after filtration; the mixed solution is heated to 80-100 DEG C, the pH value of the mixed solution is adjusted to be 2-2.5, reaction is carried out for 1-4h, and the ferric phosphate is obtained after filtration, washing and drying; the pH value of filtrate obtained through filtration is adjusted to be 6-7, and calcium chloride is added for dephosphorization; and sodium hydroxide is added into the filtrate obtained through filtration after the dephosphorization, the molar ratio of SO42-/Na+ is adjusted to be (0.9-1.1):1, the mixture is cooled to -5+/-3 DEG C under a stirring condition, the obtained filtrate is heated and evaporated until the liquid-solid ratio is (0.8-1.1):1, and then a lithium hydroxide crude product is obtained through cooling, crystallization and filtration.

A method for preparing high performance polysilicate ferric aluminum sulfate from coal gangue aims to provide a method for preparing the high performance polysilicate ferric aluminum sulfate from the coal gangue as a main raw material, and provides a new approach for efficient intergraded recycling utilization of the coal gangue, and a new the technology for an iron and aluminum inorganic polymer flocculant is explored. Industrial sulfuric acid and the coal gangue by leached in an acid to obtain ferric aluminum sulfate, the ferric aluminum sulfate is oxidized and polymerized to obtain poly ferric aluminum sulfate, active sodium silicate is obtained from leaching residue by alkali leaching, the poly ferric aluminum sulfate and the active sodium silicate are added for compounding and copolymerization in accordance with the volume ratio and different mass concentrations to obtain a polysilicate ferric aluminum sulfate product after copolymerization for 1-3H. The comprehensive utilization of the coal gangue is complete, the prepared product has high added value, the method has the advantages of convenient operation, low energy consumption, simple process, and the like, can solve the problem of high turbidity, high chroma and high heavy metal residues and the like of all kinds of wastewater, and the wastewater can meet national emission standards.

The invention relates to a wastewater treatment agent for a paper mill. The wastewater treatment agent for the paper mill comprises the following components: 50-80 parts of biomass charcoal powder, 20-40 parts of synergist formed by polymeric ferric sulfate or aluminium polychlorid or poly propylene amide or carboxymethyl starch, 30-40 parts of ethidene diamine, and 10-15 parts of phosphate, wherein the phosphate is one or more of sodium or potassium salt containing phosphate radical, hydrogen phosphate or dihydrogen phosphate radical. By adopting the wastewater treatment agent disclosed by the invention, the wastewater treatment agent can effectively play the roles of corrosion inhibition, scale inhibition, and inhibition of growth of algae after being added to a circulating water system, and plays a good protection role on a cooling water system; no 'three wastes' are discharged in the entire process; the pollution of black liquor of a pulping paper mill is solved; the wastewater treatment agent is used for treatment of wastewater, treats the waste by the waste, is simple in treatment process, less in dosage and good in effect; the cost of water treatment is effectively reduced; and the wastewater treatment agent has good economic benefit and wide social benefit.

The invention relates to a preparation method of polyferric sulfate (PFS). The method comprises the following steps of dissolving a certain amount of bivalent ferric salt into water; adjusting the pH value through sulfuric acid, and heating and stirring in a water bath; adding a certain amount of persulfate serving as an oxidant to oxidize Fe<2+> in solution; and performing hydrolytic polymerization to obtain PFS. A novel method is provided for the preparation of PFS. The method disclosed by the invention has a simple process; a prepared PFS coagulant has a good coagulation effect and high turbidity removal rate of up to 94.6 percent; moreover, various indexes of the prepared PFS coagulant are consistent with the requirement of PFS serving as a GB14591-2006 water treatment agent; furthermore, the using amount of ferrous sulfate required to be added in the method is small, the adding speed of sodium persulfate serving as an oxidant is easy to control, and ferrous iron is fully oxidized; and moreover, the method has the advantages of simple operating process, no corrosion, wide pH application range, low cost, high performance and a very good market prospect.

The invention relates to a method for producing solid poly ferric sulfate. The key point of the technical scheme of the invention is as follows: the method for producing solid poly ferric sulfate comprises the following steps: weighing 100 parts by weight of industrial ferrous sulfate (FeSO4.7H2O), adding into an acidproof reaction kettle, heating to 80-130 DEG C, and electrically stirring to become slurry; respectively adding 10-13 parts by weight of 98% (mass concentration) concentrated sulfuric acid and 20-30 parts by weight of 50% (mass concentration) oxydol in a spraying mode, and stirring to react for 1-4 hours; and adding 2-6 parts by weight of industrial ammonium salt, uniformly stirring, then transferring all the products to a condensing tank, cooling, and standing for 8-36 hours to obtain powdery solid poly ferric sulfate. The invention has the advantages of low production cost, low energy consumption, simple operation procedure, low equipment cost and the like. The produced solid poly ferric sulfate conforms to the requirements of national standard (GB14591-2006 Water treatment chemical-Poly ferric sulfate) and can be widely used. The solid poly ferric sulfate can be used for purifying both sewage and drinking water.

The chemical compound for sewage treatment consists of aluminum chloride polymer 94-98 wt% and iron trichloride 2-6 wt%. Here, aluminum chloride polymer may be replaced with iron sulfate polymer; and polyacrylamide, copper dichloride, symclosene, etc. may be also added into the chemical compound for suiting varying sewage. The chemical compound may be recovered for reuse, and has low water treating cost. The treated water can reach GB/14848-2001V standard.

The invention discloses a compound medicament for treating coking wastewater and a preparation method thereof and belongs to the technical field of material and environment engineering. The compound medicament comprises the following components in part by mass: 100 parts of sodium sulfate, 350-450 parts of aluminum sulfate, 15-25 parts of water, 50-100 parts of polymeric ferric sulfate, 50-100 parts of activated sodium silicate and 2-8 parts of chitosan. The preparation method comprises the following steps: carrying out hydrothermal reaction after the sodium sulfate, the aluminum sulfate and the water are mixed according to the proportion, cooling, then adding the polymeric ferric sulfate, the activated sodium silicate and the chitosan according to the proportion, agitating, uniformly mixing, and drying at a constant temperature to obtain the compound medicament. The medicament prepared by the method has good removal effect on the treatment of biochemical effluent water of coking wastewater, pharmaceutical wastewater, printing and dyeing wastewater and garbage leachate wastewater, and particularly has better effect for removing both COD (Chemical Oxygen Demand) and chromaticity inthe coking wastewater.