54results about "Iron compounds preparation" patented technology

The invention discloses a processing method for resource recycling and zero discharge of steel hydrochloric acid pickling waste liquid. The method adopts the process steps of carbide slag neutralization and pre-oxidation, air oxidation, heating synthesis, press filtration, filtrate circulation and concentration, acid gas absorption and the like so as to prepare high-iron-content magnetic iron compounds and liquid calcium chloride. The method disclosed by the invention takes industrial waste, namely carbide slag, as a raw material for processing steel hydrochloric acid pickling waste liquid, controls reasonable process parameters for recycling magnetic iron compounds which can be used for replacing iron ore powder in the iron industry, have the iron content of 52-62% and meet the iron ore powder standard as well as liquid calcium chloride which meets the 'GBT26520-2011' standard, and realizes the zero discharge of pollution control in steel enterprises. Moreover, the method is simple and stable, strong in operability, little in water consumption and low in energy consumption, greatly reduces the processing cost, and is particularly suitable for processing the steel pickling waste liquid in medium and small-sized enterprises.

The invention discloses an extraction decontamination method for industrial iron slag sulfuric acid leaching. The extraction decontamination method comprises five procedures of sodium saponification, nickel saponification, extraction, washing and back extraction. P507 is adopted as an extraction agent, solvent oil or sulfonated kerosene is adopted as a diluent, on the basis of different combination properties of different metal ion extraction agents and the principle that the combination property of one metal with the extraction agents can be damaged by hydrochloric acid of different concentrations, target metals of Ni and Fe ions can be separated, metal ions such as Co, Cu, Pb, Zn, Ca and Mg in the leaching can be further removed, then the industrial iron slag sulfuric acid leaching can be deeply purified, and a nickel sulfate solution and a ferrous chloride solution with low impurity contents can be prepared. The extraction decontamination method disclosed by the invention is simple and convenient in process procedure and high in impurity removal rate, and the quality of the produced nickel sulfate solution and ferrous chloride solution meets quality requirements for producing nickel sulfate and ferric oxide products.

An object of the present invention is to provide, in order to deal with a high frequency band in which radio waves are expected to be increasingly used hereafter, a magnetoplumbite-type hexagonal ferrite material having significantly improved high-frequency property of magnetic permeability. Specifically, a magnetoplumbite-type hexagonal ferrite is represented by a composition formula: A_(1-X)B_xC_x(D1_yD2_y)Fe_(12-x-2y)O₁₉ (where x: 0.1 to 0.3, y:0.1 to 0.5), wherein A is any one of Ba²⁺, Sr²⁺ and Ca²⁺, B is any one of La³⁺ and Nd³⁺, C and D1 are any one or more of Co²⁺, Mn²⁺, Mg²⁺, Zn²⁺, Cu²⁺ and Ni²⁺, and D2 is any one of Ti⁴⁺ and Zr⁴⁺.

The invention discloses a resourceful treatment method of hot galvanizing pickling waste liquid, which comprises the following steps: filtering the pickling waste liquid to remove suspended matters and insoluble solids, and adding a reducing agent to reduce Fe < 3 + > in the pickling waste liquid into Fe < 2 + >; carrying out multi-stage countercurrent extraction on the pickling waste liquid through an extraction agent, carrying out reverse extraction on an organic phase through a reverse extraction agent, filtering reverse extraction liquid to obtain a filter cake A, dissolving the filter cake A with diluted hydrochloric acid, and adding a small amount of pickling waste liquid to obtain a solution A; adjusting the pH value of the solution A by using ammonia water and ammonium chloride toremove Fe < 3 + > to obtain a solution B; adding strong alkali into the solution B, and heating and boiling until no ammonia smell exists, so as to obtain a solution C containing white precipitate; and filtering the white precipitate to obtain a filter cake B, and drying the filter cake B to obtain zinc oxide. The recovery treatment method for the hot galvanizing pickling waste liquid is simple, low in energy consumption, safe to operate, low in investment cost, capable of achieving maximum resourceful utilization of the hot galvanizing pickling waste liquid, convenient to implement, easy to maintain and manage and worthy of being further popularized in industrial production.

The invention belongs to the field of environmental chemistry and discloses a method for preparing iron oxide red from coal ash .The method comprises the steps of 1, acid leaching, wherein digestion is conducted on coal ash with acid solution to obtain acid leaching solution; 2, extraction, wherein the acid leaching solution is extracted with an extracted organic phase to obtain extract liquor; 3, back extraction, wherein back extraction is conducted on the extract liquor with a back extractant to obtain back extraction solution; 4, evaporation and concentration, wherein the back extraction solution is evaporated, concentrated and crystallized; 5, calcination, wherein crystals are calcined to obtain iron oxide red .According to the method, iron oxide red is prepared with coal ash as the raw material, recycling application of coal ash waste is achieved, the utilization rate of valuable metal in coal ash is increased, and the environment problem is solved; an adopted extraction agent can be recycled, so that industrial production cost is reduced; the quality of prepared iron oxide red is high, and purity is 95% or more and meets the GB1863-2008 product technology requirement.

The invention provides a method for removing sulfur on hydroxyl oxidize iron. By strictly controlling the water content of sulfur-containing hydroxyl oxidize iron, the desulfuration capability of hydroxyl oxidize iron and the purity of recycled sulfur are effectively ensured on the premise of efficiently separating sulfur from hydroxyl oxidize iron, which is because when the water content of hydroxyl oxidize iron is too high, the water is dispersed into fine particles in an organic solvent, which not only reduces the desulfurization capability of hydroxyl oxidize iron, but also causes the recycled sulfur to contain a large number of iron.

The invention provides a treatment method of a waste acid solution containing heavy metals, which comprises the following steps: carrying out iron-carbon reduction treatment on the waste acid solutionto reduce Fe< 3 + > in the solution into Fe < 2 + >; under the condition of high-concentration acid, adopting an ammonia extraction agent toextracta waste zinc solution and a waste acid solution, wherein the waste zinc solution contains Zn < 2 + >, and the waste acid solution contains at least one of iron ions, nickel ions, chromium ions and lead ions; adding an alkaline substance into the wastezinc solution to obtain zinc hydroxide and an organic solvent can be used as theammonia extraction agent; and precipitating heavy metals in the waste acid solutionby a synthestic sulfur precipitant. Compared with the prior art, the method has the following advantages that ferric ions are reduced, free acid is reduced and a small amount of heavy metalsarereplaced by utilizing an iron elementary substance while iron-carbon pretreatment is carried out; the zinc separation rate can reach 99.8% or above; the obtained zinc oxide product with the content of 98% or above can be used for selling; one part of an obtained supernatant can be used for circulating water, and the other part can be used for industrial water.

The invention discloses a purification method of ferric trichloride, which comprises the following steps: oxidizing iron-containing chloride into ferric trichloride, adding industrial hydrochloric acid and butyl acetate, extracting, standing for layering, taking an organic phase, adding a stripping agent, carrying out reverse extraction to obtain ferric trichloride with ultralow impurity content, evaporating, concentrating, and removing organic matters to obtain high-purity ferric trichloride. Recyclable organic phase. The purification process is not limited by the purity of production raw materials, is simple to operate and low in equipment investment, and does not use toxic extractant. The ferric trichloride product produced by the process disclosed by the invention can be applied to the fields of drinking water treatment, medical intermediates, analytical testing, precision etching and the like.

The invention provides a method for separating FeOOH and sulfur and applications of sulfur free FeOOH. According to the method, the water content of sulfur containing FeOOH is strictly controlled, onthe premise that sulfur and FeOOH are separated efficiently, the desulfurization performance of FeOOH is guaranteed, and the purity of recovered sulfur is ensured. If the water content of FeOOH is toohigh, FeOOH is dispersed in an organic solvent to form micro particles, the desulfurization performance of FeOOH is reduced, and recovered sulfur contains a large amount of iron.

The present invention provides a process that allows the oxidation of trivalent arsenic and ferrous ion, simultaneous with neutralization of the acid solution to be treated, the precipitation of arsenic and oxidized ferric iron added in a molar ratio Fe:As determined at a defined pH, all of the above with a high efficiency of precipitation of arsenic as ferric arsenate or scorodite, obtaining a final residue stable in the long term, characterized by their higher content of arsenic in a lower volume compared with the procedures described in the state of the prior art.

The invention provides a titanium dioxide hydrolysis waste acid recycling treatment process. The process comprises the following steps: (1) collecting generated wastewater, freezing for crystallizing,carrying out heat exchange, and then carrying out pretreatment; (2) enabling pretreated produced water to enter a first-section nanofiltration unit; (3) enabling the concentrated solution of the first-section nanofiltration unit to enter a second-section nanofiltration unit, returning the water produced by the second-section nanofiltration unit to the first-section nanofiltration unit for water feeding; (4) enabling water produced by the first-section nanofiltration unit to enter an evaporation unit, performing evaporative concentration, and enabling condensed water of the evaporation unit toenter a reverse osmosis unit; and (5) enabling concentrated water of the second-section nanofiltration unit to enter a resin adsorption unit, enabling effluent of the resin adsorption unit to enter aheat exchange unit, enabling the wastewater subjected to heat exchange to enter a reaction kettle, using the wastewater subjected to reaction as inlet water of the evaporation unit, and then crystallizing and drying to obtain a polyferric product. The process provided by the invention can effectively treat the titanium dioxide hydrolysis waste acid, realizes zero-discharge recycling of the wasteacid, and realizes waste-to-treasure.

The invention discloses a method for recovering valuable elements from chlorination-process titanium dioxide waste acid through sectional extraction. The method comprises the following steps: S1, adding a first organic phase into the chlorination-process titanium dioxide waste acid to obtain a first extraction raffinate and an iron load, and carrying out back extraction on the iron load to obtaina ferric chloride solution; S2, adding a second organic phase into the first extraction raffinate to obtain second extraction raffinate and a scandium-titanium-zirconium-niobium load; S3, carrying outback extraction on the scandium load to obtain a scandium-titanium-zirconium-niobium enriched product; S4, adjusting the pH value of the second extraction raffinate to prepare a liquid; S5, adding athird organic phase after liquid preparation to obtain a vanadium-aluminum load and a third extraction raffinate; S6, carrying out back extraction on the vanadium-aluminum load to obtain a vanadium-aluminum mixed solution; S7, adjusting the pH value of the third extraction raffinate to prepare a liquid; S8, after liquid preparation, adding a fourth organic phase into manganese extraction feed liquid to obtain a manganese load and a fourth extraction raffinate, and carrying out back extraction on the manganese load to obtain a manganese-containing solution; and S9, neutralizing the fourth extraction raffinate, carrying out filtering, then performing concentrating and crystallizing to obtain NaCl edible salt and water, and recycling the NaCl edible salt and water.

The present invention is directed to a process for preparing vanadium pentoxide from an ash composition comprising solid ash particles, vanadium, iron and nickel compounds optionally present in an aqueous solution. The process comprises the following steps: (i) leaching the ash composition by contacting the ash composition with an acid aqueous solution at a pH of below 1, (ii) adding a reducing agent to the aqueous solution, (iii) contacting the aqueous solution obtained in step (ii) with an ion exchange resin in its H + ionic form, (iv) desorption of the vanadium compounds from the ion exchange resin rich in vanadium compounds by contacting the ion exchange resin with an aqueous solution of H 2 SO 4 to obtain an aqueous solution rich in vanadium compounds, and (v) converting and isolating the vanadium compounds as present in the aqueous solution to vanadium pentoxide.

The invention relates to a method for recycling iron-containing zinc-containing sludge to prepare zinc hydroxide and dye-grade iron oxide yellow and belongs to the field of waste resourceful treatment. The method comprises the steps of adding hydrochloric acid into iron-containing zinc-containing sludge to adjusting a pH value, then adding steel scrap, stirring, extracting in an extraction agent, classifying and deoiling; performing back extraction on zinc-containing load organic phase to prepare zinc hydroxide; adding alkaline substance into ferrous chloride solution with the zinc content smaller than or equal to 1g/L to adjust a pH value as 3.0 to 7.5 in 12 to 32 DEG C, introducing oxidizing gas, performing low-temperature oxidization with oxidization time of 60 to 1200min, warming to 50 to 90 DEG C, adding alkaline substance to adjust a pH value to be 2.8 to 3.6, introducing oxidizing gas, oxidizing for 30 to 115h, guaranteeing the pH value of liquid to be 2.8 to 3.6 in an oxidizing process, finishing oxidization, filtering and drying to obtain the dye-grade iron oxide yellow. The method is a recycling technology of iron-containing zinc-containing sludge in a hot galvanizing factory and has the advantages of small equipment invest, low energy consumption and high purity of a prepared product.

The invention discloses a preparation method and application of iron oxide red. The preparation method of the iron oxide red comprises the following steps of: transferring iron ions from an aqueous solution containing the iron ions into an oil phase by adopting an extracting agent, adding a precipitant into the separated oil phase to form iron precipitate, and then treating the iron precipitate toobtain the iron oxide red. The synthesized iron oxide red is used in the fields of paint, printing ink, plastic, leather coloring, wallpaper, powder coating, cosmetics, food and the like.

The invention discloses a preparation method of a doped sensitive material for improving the performance of a hydrogen sensor. The preparation method comprises the following steps: S1, adding a precipitant into deionized water, and fully and uniformly mixing to obtain a colorless and transparent mixed solution A; S2, adding ferric trichloride and transition metal salt into the mixed solution A obtained in the step S1, and fully and uniformly mixing to obtain a clear and transparent precursor solution B; S3, putting the precursor solution B obtained in the step S2 into a high-temperature stirring reaction kettle with a polytetrafluoroethylene lining, and performing stirring and heat preservation at 120 DEG C for 12-24 hours; and S4, centrifuging, washing and drying the material obtained in the step S3 to obtain the doped alpha-Fe2O3-based sensitive material. The preparation method is simple in synthesis process, high in repeatability and low in cost, and high-temperature calcination and use of a surfactant are not needed. The sensitivity, the stability and the selectivity of the hydrogen sensor made of the sensitive material are remarkably improved.

Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.