Topic
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.
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22 Feb 1983
TL;DR: In this article, the modification of a diffusion barrier by the deposition of one or more inorganic species within the pores and on the surfaces of said diffusion barrier to form an immobilized crystalline lattice barrier or molecular grid having substantially uniform permeability and to select and separate different ionic species, giving a high efficiency of separation with a low energy input.
Abstract: The modification of a diffusion barrier by the deposition of one or more inorganic species within the pores and on to the surfaces of said diffusion barrier to form an immobilized crystalline lattice barrier or molecular grid having substantially uniform permeability and to select and separate different ionic species, giving a high efficiency of separation with a low energy input. The diffusion barrier is characterized by one or more units, each incorporating a tubular housing with a bundle of porous hollow fibres therein, arranged in the axial direction of the housing. The inorganic crystalline lattice is exemplified by barium sulphate (BaSO 4 ) formed by the interdiffusion of barium hydroxide (Ba(OH) 2 ) and sulphuric acid (H 2 SO 4 ) solutions, or, alternatively, co-precipitated aluminium hydroxide (Al(OH) 2 ) and barium sulphate (BaSO 4 ) formed by the interdiffusion of barium hydroxide (Ba(OH) 2 ) and aluminium sulphate (Al 2 (SO 4 ) 3 ) solutions. These immobilized inorganic diffusion barriers are used for selective separation of small molecules (e.g. with a molecular weight of less than 1000 daltons) and provide means for the more effective separation of ionic species. A method is also provided for the low cost removal of ions from molasses, to enhance fermentation efficiency and to improve its usefulness as a stock feed supplement, or it may be followed by other treatments to reduce and/or remove higher molecular weight substances, such as proteins and waxes, to produce sugar syrups and caramel substitutes.
35 citations
TL;DR: In this paper, the case of Fe2+ ions removal from a synthetic aqueous solution by electrocoagulation with aluminium electrodes was investigated and the significance of the various physicochemical phenomena encountered e.g., formation of divalent iron hydroxide, adsorption of Fe species on Al(III) flocs formed and oxidation phenomena.
35 citations
TL;DR: In this paper, a new system is proposed for the treatment of waste aluminium and the total exergy loss (EXL) in the system for the co-production of 1 kg of hydrogen at 30 MPa and 26 kg of aluminium hydroxide is evaluated from the viewpoint of life cycle assessment (LCA) by comparison with the EXLs in conventional systems.
34 citations
TL;DR: In this article, the authors examined some of the factors affecting the crystallised phase of aluminium hydroxides in highly caustic solutions using several different methodologies, and concluded that the results of these results were not necessarily indicative of the in situ crystalline components.
34 citations
TL;DR: In this paper, two types of aluminium hydroxide gels are postulated: pseudoboehmite gel and pregibbsite gel, which is positively charged and, in the absence of inorganic anions, crystallizes slowly to gibbsite.
Abstract: Aluminium hydroxide gels have been prepared by the hydrolysis of amalgamated aluminium in water and by precipitation from aluminium salt solutions with an anion exchange resin in the hydroxyl form. The products crystallizing from such gels have been examined by electron microscopy and by X-ray and electron diffraction. Bayerite crystallizes as cone or pyramid-shaped particles and gibbsite as hexagonal plates or prisms. Two types of gel are postulated. The first type, pseudoboehmite, predominates in the absence of acids, is uncharged and rapidly crystallizes to bayerite; the second type, pregibbsite gel, occurs in carboxylic acid solutions, is positively charged and, in the absence of inorganic anions, crystallizes slowly to gibbsite.
34 citations