Showing papers on "Aluminium hydroxide published in 1973"
TL;DR: The infrared spectrum of nordstrandite, which is probably the stable polymorph in alkaline solution, shows evidence of strongly polarized hydroxyl ions similar to gibbsite as mentioned in this paper.
Abstract: Infrared absorption spectra of the precipitated solids separated from aluminium-hydroxide solutions below the pH of minimum solubility of Al(OH)3 demonstrate the slow ageing of polymeric Al complexes to gibbsite. On comparison with the spectra of natural gibbsites, shifts in absorption frequency during crystal growth are interpreted in terms of changes in hydrogen bonding as a consequence of deprotonation and stacking of aluminium hydroxide layers to form gibbsite. In alkaline solutions the bayerite polymorph precipitates and IR frequencies are compatible with protonation as aluminate ions associate with the bayerite crystal having a lower crystal energy than its low pH polymorph. The infrared spectrum of nordstrandite, which is probably the stable polymorph in alkaline solution, shows evidence of strongly polarized hydroxyl ions similar to gibbsite.
62 citations
TL;DR: Man, aged 26 History: In 1965 he had two injections of tetanus toxoid adsorbed (purified toxoid aluminium hydroxide) into the left buttock, which became red and painful and two hard lumps developed.
Abstract: Man, aged 26 History: In 1965 he had two injections of tetanus toxoid adsorbed (purified toxoid aluminium hydroxide) into the left buttock. The two areas became red and painful and two hard lumps developed. There has been little change over the last eight years. There is now no pain. In 1954 he was under the care of a consulting pidiatrician with erythema nodosum thought to be due to a preceding streptococcal infection. At that time tuberculin jelly test was negative, Mantoux 1:1000 negative.
6 citations
TL;DR: In this article, the authors used thermogravimetric (TG), differential thermal analysis (DTA) and chemical analysis of the ZnO·3Al 2 O 3 system.
6 citations
TL;DR: In this paper, a modified form of the Elovich equation has been proposed for such heterogeneous decomposition processes, where diffusion is the rate controlling process and the Coats and Redfern equation is employed.
5 citations
Patent•
08 Feb 1973
TL;DR: In this paper, the process of dressing natural, water-insoluble magnesium cpds in ground form is described, in which the starting material is subjected to a caustizing calcination and is slurried in water and subjected to the action of HCl, any existing Fe2+ cpds are then transformed into Fe3+cpds.
Abstract: Process of dressing natural, water-insoluble magnesium cpds. partic. magnesite, in ground form wherein the starting material is opt. subjected to a caustizing calcination and is slurried in water and in the first step is subjected to the action of HCl, any existing Fe2+ cpds. are then transformed into Fe3+ cpds. whereafter iron hydroxidey and aluminium hydroxide or Fe2O3 and Al2O3 are precipitated, pref. with the aid of active MgO, and, if desired, Ca cpds. are precipitated and separated, then the MgCl2 present in the remaining soln. is transformed into MgO and HCl. The HCl is recycled to the first step to treat additional starting material.
4 citations
Patent•
15 Feb 1973
TL;DR: Binder compn. comprises a hydrophilic, acid-modified 1,3,5-triazine resin and a tri- or higher polyvalent basic inorganic oxide as discussed by the authors.
Abstract: Binder compn. comprises a hydrophilic, acid-modified 1,3,5-triazine resin and a tri- or higher polyvalent basic inorganic oxide. Resins are known materials, esp. sulphite- or sulphonic acid modified melamine resins. The oxide may be aluminium oxide, ferric oxide, Cr2O3, Pb3O4, bauxite, aluminium hydroxide, etc. The binder may contain up to 99% oxide. Products are useful as moulds and cores for cast iron and as a cement for prefabricated building components.
2 citations
Patent•
15 Feb 1973
TL;DR: In this paper, the authors describe an open-cell lightweight concrete with fibres or fabrics made from glass, slag, basalt etc. embedded (at least partly) in an alkali-resistant binder formed from a suspension of colloidal aluminium hydroxide, colloidal silica or aluminium phosphate.
Abstract: Corrosion-resistant structural elements, such as slabs, plates, pipes etc. having good mechanical strength, are produced by reinforcing an open-cell lightweight concrete with fibres or fabrics made from glass, slag, basalt etc. embedded (at least partly) in an alkali-resistant binder formed from a suspension of colloidal aluminium hydroxide, colloidal silica or aluminium phosphate, which is hardened by drying and becomes insoluble.
1 citations