4 results about "Aluminium hydroxychloride" patented technology

The invention discloses a soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: mixing diatomite with a hydrochloric acid solution, heating and stirring for reaction, performing suction filtration, washing with deionized water until filtrate is neutral, and drying and grinding to obtain purified diatomite; dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and urea in deionized water to form a salt-urea mixed solution, adding purified diatomite for dispersion, and carrying out hydrothermal reaction, cooling, suction filtration, hot deionized water washing and drying on the turbid liquid to obtain a layered double hydroxide-diatomite composite material; the composite material is dispersed in a Tris-HCl buffer solution, dopamine hydrochloride is added under stirring for a reaction, suction filtration, deionized water washing and drying are performed after the reaction, and the soil conditioner is obtained. The modifier prepared by the invention can efficiently fix anionic and cationic heavy metals in soil, and is good in stability.

This invention discloses a comprehensive recycling method for byproducts of alkyl dichlorophosphine production. The method includes: reacting an alkanoic acid compound with the alkyl dichlorophosphine in the byproduct to generate a phosphorus-containing flame retardant or its intermediate, obtaining a post-reaction mixture; then, gradually separating sodium chloride and precipitates in the form of hydrated aluminum trichloride by progressively increasing the hydrogen chloride content in the system, obtaining a mixture containing the phosphorus-containing flame retardant or its intermediate, a small amount of aluminum chloride, sodium chloride, and hydrochloric acid; distilling and concentrating the mixture, adding sodium hydroxide, filtering, acidifying and concentrating the filtrate, and then extracting and purifying. This method yields pure sodium chloride, pure hydrated aluminum chloride, and the phosphorus-containing flame retardant or its intermediate. The steps are clear, the function is well-defined, and the method is simple and easy to control, completely solving the problem of comprehensive utilization of complex salts in the production of methyl dichlorophosphine.

The present invention relates to a method for producing an aluminous material, in particular, aluminium oxyhydroxychlorides and alpha alumina. The method comprising providing an aluminium-containing feedstock and separating the aluminium-containing feedstock to provide a pregnant liquor. The pregnant liquor is concentrated to obtain a saturated aluminium solution and subjected to a crystallisation process. The aluminium chloride hexahydrate crystals slurry is cooled, and the crystals separated from a spent liquor. The aluminium chloride hexahydrate crystals is heated under controlled air flow to obtain dehydrated aluminium oxyhydroxychlorides. Optionally, the aluminium chloride hexahydrate crystals may be dried under at least a partial vacuum before being heated under controlled air flow. The aluminium oxyhydroxychlorides may be subsequently decomposed and calcined to form primarily alpha alumina.

The application discloses a kind of soil improvement additive based on slag aggregate and preparation process thereof, belong to soil improvement technical field.First, slag aggregate is mixed with phosphoric acid solution, filtrate and solid are collected, to obtain acid-activated slag, then the collected filtrate is mixed with magnesium chloride hexahydrate, aluminium chloride hexahydrate and urea, and the pH is adjusted to obtain a hydrothermal reaction solution;The hydrothermal reaction solution and acid-activated slag are reacted, filtered to obtain slag@LDHs, solvent and cetyltrimethylammonium bromide are added, ammonia water and tetraethyl orthosilicate are added in sequence, and the mixture is stirred to obtain slag@LDHs@SiO2;Deionized water, ferrous sulfate heptahydrate and sodium citrate are mixed, and the pH is adjusted to obtain a plating solution.Finally, slag@LDHs@SiO2, plating solution and sodium hypophosphite are mixed and reacted to obtain a soil improvement additive.The soil improvement additive provided by the application can dynamically neutralize acidic soil, reduce nutrient loss and reduce heavy metal content in crops.