Aluminium hydroxide

About: Aluminium hydroxide is a research topic. Over the lifetime, 2043 publications have been published within this topic receiving 22032 citations. The topic is also known as: Al(OH)3 & Amphojel.

Aluminium precipitates from groundwater of an aquifer affected by acid atmospheric deposition in the Senne, Northern Germany.

Abstract: White precipitates collected from stream bottoms and well tubes in the Senne area consist of amorphous aluminium hydroxide, coprecipitated with minor amounts of sulfate, phosphate and silica. The precipitates have presumably formed by the interaction of slightly alkaline water from calcareous subsoil sediments, with acidic water draining off sandy soils affected by high inputs of acidic atmospheric deposition. From many hydrochemical studies, precipitation of aqueous aluminium is known to occur in subsurface horizons of acid soils affected by acid rain. On the basis of presumed equilibrium with soil solutions, jurbanite, AlOHSO4 · 5H2O, is often assumed to be the secondary mineral involved. However, direct evidence for jurbanite from solid phase analysis is lacking. This first analysis of such a secondary phase does not support the jurbanite hypothesis, and shows that amorphous Al hydroxide can be formed instead.

Comprehensive utilization treatment tachnology of aluminium waste slag, waste ash

Abstract: The present invention relates to a comprehensive utilization treatment process of waste aluminium slag and waste aluminium dust. Said process includes the following several steps: using caustic soda solution to dissolve waste aluminium slag and waste aluminium dust to obtain slurry; making the slurry undergo the process of liquid-solid separation, using liquid phase to obtain sodium aluminate solution; in solid phase adding auxiliary material Na2CO3 and limestone to make sintering; crushing and grinding the sintered clinker, using dilute alkaline solution to dissolve the sintered clinker, utilizing liquid phase to obtain the sodium aluminate solution, making the obtained sodium aluminate solution produce hydrolysis or carbonation decomposition so as to obtain aluminium hydroxide. Said process also can make the following steps: adding water-glass into the obtained sodium aluminate solution to make them into colloid solution, adding crystallization orientating agent in the above-mentioned colloid solution, uniformly stirring them, heating, standing still at constant temperature, making the crystallized slurry undergo the process of liquid-solid separation, washing, drying solid phase to obtain zeolite.

Method for preparing alumina by using power plant fly ash

Abstract: The invention discloses a method for preparing alumina by using power plant fly ash, characterized by: grinding the fly ash, leaching with concentrated sulfuric acid to obtain an aluminum sulfate solution, precipitating aluminum sulfate crystals by concentrating and cooling, dissolving the aluminum sulfate crystals with hydrochloric acid, then letting an HCl gas in the solution to saturate the solution to precipitate AlCl3-6H2O crystals, reacting the AlCl3-6H2O crystals with an ammonium hydroxide solution or liquid ammonia or an ammonium bicarbonate solution or an ammonium carbonate solution to obtain an aluminium hydroxide and ammonium chloride solution, calcining aluminium hydroxide to obtain alumina, displacing ammonium chloride by using magnesium oxide to obtain ammonia gas and magnesium chloride, and hydrolyzing magnesium chloride to obtain magnesium oxide and hydrochloric acid for recycling.

Retarding, corrosion-proof and water type daping slurry prepn. method

Abstract: A water paint with flame-retarding, anticorrosion and damping functions for the structure of vehicle and ship is prepared from mica powder, aluminium hydroxide, styrene-acrylate emulsion, silicic acrylate emulsion, elastic emulsion, flame-retarding agent, emulsifier, propanediol, dimethyl ethanolamine, thickening agent and neutral water through proportional mixing, stirring, regulating pH value, grinding and packing

Residual Aluminium Concentration in Drinking Water After Treatment with Aluminium or Iron Salts

Abstract: In recent years a potential connection between human intake of aluminium and Alzheimer’s disease has drawn attention to the aluminium concentration in drinking water. In the present paper the aluminium concentration in drinking water from treatment plants using aluminium or ferric coagulants is compared with the solubility of aluminium hydroxide, reviewed from the literature. Aluminium hydroxide is least soluble at about pH 6.3. At lower pH, positively charged aluminium hydroxide complexes, and at higher pH, negatively charged aluminate ions are formed, and at these pH values, solubility is higher. Complexing agents increase the solubility.