2 results about "Aluminium hydroxychloride" patented technology

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.