12 results about "Ferric hydroxide" patented technology

This invention provides a one-dimensional silver nanostructure / metal hydroxide composite material, its preparation method, and its application. The preparation method includes: adding a one-dimensional silver nanostructure, a metal salt, and an additive to a solvent and stirring to disperse them evenly; adding an acidic or alkaline reagent under stirring conditions to adjust the pH of the solution, causing the metal ions in the solution to convert into metal hydroxide precipitates, obtaining a one-dimensional silver nanostructure-metal hydroxide suspension; then performing solid-liquid separation, washing and drying the obtained solid product to obtain a one-dimensional silver nanostructure / metal hydroxide composite powder; wherein the metal hydroxide is aluminum hydroxide, zinc hydroxide, magnesium hydroxide, iron hydroxide, manganese hydroxide, copper hydroxide, nickel hydroxide, or cobalt hydroxide, and the one-dimensional silver nanostructure is silver nanowire or silver nanoribbon. The resulting composite material uses metal hydroxide as a carrier and separator, inhibiting the drying and agglomeration of silver nanowires from the source, exhibiting high conductivity and good redispersibility, thus improving conductivity.

This invention provides high-purity ferric citrate that is substantially free of β-iron hydroxide. [Solution] A high-purity ferric citrate that substantially does not contain β-iron hydroxide, and in which the β-iron hydroxide content is less than 6% by weight relative to its total weight. Preferably, high-purity ferric citrate having a β-iron hydroxide content of less than 2.5% by weight. More preferably, high-purity citric acid II having a β-iron oxide content of less than 1.0% by weight. iron.

This invention discloses a composite catalyst, its preparation method, and its application in sludge treatment, belonging to the field of sludge treatment and environmental protection technology. The invention synthesizes an iron-carbon nanocomposite catalyst using ferric nitrate nonahydrate, antibiotic bacterial residue, and melamine as precursors. The resulting catalyst can, on the one hand, activate ammonium persulfate to generate free radicals that disrupt the water-locking structure of the sludge, enhancing its hydrophobicity and thus improving dewatering efficiency. On the other hand, the Fe species in the composite catalyst activates ammonium persulfate to form Fe... 3+ Fe 3+ The hydrolysis generates ferric hydroxide colloids that can adsorb sludge particles, neutralize surface charges, thereby reducing interparticle repulsion, promoting floc aggregation, and enhancing dewatering efficiency. The advanced oxidation process of ammonium persulfate catalyzed by iron-carbon nanocomposite catalysts also achieves the removal of antibiotic resistance genes from sludge.

This invention belongs to the field of flow battery energy storage technology, and relates to a negative electrode electrolyte for alkaline all-iron flow batteries and its preparation method. The negative electrode electrolyte is prepared from iron salts, a complexing agent, a promoting component, an alkaline component, an auxiliary electrolyte, and water. The total iron concentration is 0.1–2.0 mol / L, the molar ratio of the complexing agent to the iron salt is 1.5–4, the molar ratio of the promoting component to Fe is 0.05–1.0, the alkaline component concentration is 2.0–6.0 mol / L, and the auxiliary electrolyte concentration is 0–2.0 mol / L. The negative electrode electrolyte of this invention for alkaline all-iron flow batteries has a high total iron concentration, which not only avoids the precipitation of elemental iron during charging and discharging, but also effectively prevents the formation of ferric hydroxide precipitate, improves the stability of iron ions, and greatly extends the cycle life of the negative electrode electrolyte. It can be widely used in aqueous alkaline all-iron flow batteries.

This invention discloses a method and application for detecting starch content in sucrose ferric hydroxide. The method provides a way to detect starch in sucrose ferric hydroxide. This method can indirectly quantify starch by accurately quantifying glucose, eliminating interference from the sample solution matrix on glucose peaks. Furthermore, the glucose peaks obtained by this method exhibit good symmetry, baseline stability, accuracy, and stability.

The present application relates to a kind of suspended sulfur preparation for sewage denitrification and its preparation method, the suspended sulfur preparation can be enriched sulfur autotrophic and iron autotrophic denitrification microorganism, by adding chitosan derivative and xanthan gum, synergistic stability biofilm, reduce the risk of iron hydroxide sludge expansion, can solve the problems such as poor stability of two kinds of microorganisms coexistence, low substrate utilization rate, high sludge production, and can inhibit the generation of FeS precipitation, thereby reducing the risk of sulfide residue and sulfate accumulation.Therefore, it is mainly used for low carbon-nitrogen ratio wastewater (C / N≤5) denitrification denitrification treatment, after inoculating anaerobic sludge, nitrate nitrogen removal rate is ≥95%, process controllable, cost controllable.

A method for selectively recovering rare earth elements (REEs) from used neodymium iron boron (NdFeB) magnets is provided, and this method is... (a) A process of demagnetizing a neodymium iron boron (NdFeB) magnet, pulverizing it into fine powder / milling it, and subjecting the resulting magnet powder to aeration leaching, (b) Aeration leaching of the magnet powder is performed in order to dissolve REE as a rare earth salt, and during the aeration leaching, Fe 2+ From Fe 3+ A step of generating a mother liquor containing rare earth salts by completely precipitating iron as iron oxide and / or iron hydroxide by-products based on oxidation to, and subsequently, (c) The filtered mother liquor is reacted with oxalic acid to precipitate rare earth elements as rare earth oxalates, and further calcined to obtain rare earth oxides for recovering rare earth elements (REE) from the rare earth oxides, the method having the advantage of low acid consumption, low capital costs and reagent consumption, and simultaneously producing iron oxide and / or iron hydroxide as by-products.

The application belongs to the technical field of hydrometallurgy, and particularly relates to a method for recovering iron and manganese from wolframite acidolysis wastewater, which comprises the following steps: obtaining wolframite acidolysis wastewater containing Fe and Mn, adding a manganese-containing reagent into the wolframite acidolysis wastewater to adjust the pH to 4-4.5, filtering to obtain Fe(OH)3 and a manganese-containing filtrate; and recovering manganese from the manganese-containing filtrate by ion exchange, extraction or precipitation to obtain a manganese-containing product. The application prepares a by-product of iron hydroxide by adding a manganese-containing reagent, does not introduce other impurities in the process, and can subsequently enrich and recover the added reagent, reduces the use of additional consumables, and avoids resource waste; the self-made resin has higher exchange capacity and selectivity than traditional cation exchange resins, and improves the purity of the by-product of manganese sulfate solution; through the graded recovery of iron and manganese, the purity of calcium sulfate generated by subsequent ammonia removal is high, and the calcium sulfate can be sold as a by-product, thereby significantly reducing the solid waste discharge of the whole process.

This invention discloses a carbothermic chlorination method for recovering rare earth elements from waste magnets. The method includes the following steps: (1) mixing waste magnets, ferrous chloride, and carbon powder and then reacting them in an electrothermal treatment device to obtain reaction products; (2) subjecting the reaction products obtained in step (1) to water leaching treatment, while separating and collecting the iron powder generated in the reaction to obtain a rare earth-containing leachate; (3) sequentially adding an oxidant and a weak alkali to the rare earth-containing leachate to selectively precipitate iron ions, to obtain a rare earth enrichment solution and ferric hydroxide precipitate; (4) adding a precipitant to the rare earth enrichment solution for precipitation treatment to obtain a rare earth precipitate; (5) calcining the rare earth precipitate to obtain rare earth oxides. The core advantage of this invention is that it significantly shortens the reaction treatment time and has excellent recovery indicators. Furthermore, the carbothermic chlorination process can construct a closed-loop recycling system, which is both environmentally friendly and economical.

The application provides a fluorine-free and alkali-free liquid accelerator and a preparation method and application thereof. The fluorine-free and alkali-free liquid accelerator comprises the following components in parts by weight: 40-45 parts of aluminum sulfate, 1-5 parts of amorphous aluminum hydroxide, 1-3 parts of nano iron hydroxide, 5-9 parts of alcohol amine, 0.1-0.4 parts of a stabilizer and 40-45 parts of deionized water. The nano iron hydroxide is used in the application, which serves as an alkaline agent to further promote the polymerization of aluminum sulfate and increase the stability of the system, and on the other hand, introduces high-activity iron ions to promote the generation of iron-containing ettringite and provide a crystal nucleus site for the hydration products such as ettringite, thereby reducing the setting time and promoting the early strength. After the accelerator is mixed with cement, the 1d compressive strength is greater than 16.0 MPa, the 28d compressive strength ratio is greater than 110%, and the 90d compressive strength retention rate is greater than 100%.

The application relates to the technical field of battery material preparation, in particular to a method for preparing iron phosphate, iron phosphate and application. The method comprises the steps of adding a crystal form inhibitor into a crude iron phosphate product, aging, and calcining; the crystal form inhibitor comprises a phosphoric acid type crystal form inhibitor and an iron type crystal form inhibitor; the phosphoric acid type crystal form inhibitor comprises at least one of monoammonium phosphate, diammonium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate and phosphoric acid; and the iron type crystal form inhibitor comprises at least one of iron hydroxide, iron hydroxyphosphate, iron sulfate and iron oxalate. The prepared iron phosphate has few by-products in the aging stage, high iron-phosphorus ratio, good capacity and rate performance, and long cycle life.

We provide a method for recycling lithium from lithium iron phosphate batteries in an economical, environmentally efficient, and high-efficiency manner. A method for recycling lithium from a lithium iron phosphate battery, comprising the following steps: (a) a step of obtaining a Li+ aqueous mother liquor by adding iron trichloride (FeCl3) to a powder containing lithium iron phosphate (LiFePO4) obtained from a lithium iron phosphate battery; (b) a step of filtering the above Li+ aqueous solution mother liquor to separate solid residues and obtaining a Li+ leachate; (c) a step of adding a base to the above Li+ leachate to precipitate iron hydroxide (Fe(OH)3); (d) a step of recovering a lithium chloride (LiCl) solution; and (e) A step of recovering iron trichloride (FeCl3) from the iron hydroxide (Fe(OH)3) in step (c) and reusing it in step (a).