Showing papers on "Aluminium hydroxide published in 1975"

Evidence for a new aluminium phosphate phase from reaction rate of phosphate with aluminium hydroxide

Abstract: THE reaction between phosphate and aluminium hydroxide is important in soil fertility and also in the management of systems whereby waste water is disposed directly on to the land. The retention of phosphate by a sandy topsoil during 50 yr of application of raw sewage water cannot be accounted for by adsorption on soil constituents alone1. It was suggested that precipitation of the phosphate had probably taken place. Later investigations on this soil (Beek, personal communications) indicated the presence of an aluminium phosphate as the main fraction of phosphate retained. We report here results for the production of aluminium phosphate which may have a bearing on waste water management.

The Adsorption of Serum Proteins to Aluminium Hydroxide Gel Examined by Means of Quantitative Immunoelectrophoresis

Abstract: By means of crossed immunoelectrophoresis with intermediate gel containing a known amount of aluminium hydroxide the adsorption of the individual human serum proteins to the aluminium hydroxide was determined. The extent of adsorption varies considerably with the particular protein and is independent of the net charge, the molecular weight and the carbohydrate content of the proteins. The possible use of the method in connection with diagnosis and immunotherapy in human allergology is outlined.

The action of quartz in the presence of iron hydroxides in the human lung.

Abstract: In 1932 Kettle reported that the fibrogenic action of quartz particles is inhibited when they are coated with iron. Many authors subsequently confirmed this finding. Reif et al., who studied the effect of different iron-ore mine dusts, showed that, like aluminium hydroxide, iron hydroxide has a strong effect in inhibiting the fibrogenic action due to quartz. The findings of this paper, based on an X-ray survey of a group of 7735 iron ore miners, on autopsy examinations, tissue dust analysis and physiological examinations, confirm the view that FeO(OH) is a most powerful inhibiting substance.

Dynamic comparative study of the intraalveolar cell population after intratracheal injection of beryllium hydroxide and aluminum hydroxide in the rat

Abstract: A sequential quantitative analysis of free alveolar cells was performed on S.P.F. rats after intratracheal injection of Be (OH)2 and Al (OH)3. The induced lesions were entirely restored 20 days after the initial injection. Beryllium hydroxide inhibited DNA synthesis in the free alveolar macrophages and the transeptal cellular flow could be evidenced. Aluminium hydroxide increased the number of free cells without inhibiting DNA synthesis. Quantitative variations of polymorphonuclears, lymphocytes and macrophages were correlated with changes in the alveolar environment. A strong direct correlation between the number of lymphocytes and DNA synthetizing macrophages was shown out. This reaction was not observed in beryllium treated rats.

Granular active alumina with high apparent density and high mechanical durability

Abstract: OF THE DISCLOSUREGranular active alumina with high mechanical durability is made by activation of an aluminium hydroxide with an apparent density in the green granular condition of at least 2.20g/cm3. The green aluminium hydroxide is subjected to compacting by dry compression before activation by a usual heat treatment. Compacting is preferably by running between two rollers. The active alumina with its high mechanical durability is well suited for a number of industrial uses such as the cleaning and drying of liquids and gases as well as catalysis.

Process for recovering aluminium hydroxide from spent pickle liquors - by pptn. with an acid, coagulation and removal of water

Abstract: Al hydroxide, which is present in spent alkaline pickle liquors as aluminate, is recovered by treating the spent alkaline pickle liquor with an acid using a spent acid soln. to give pH value of 11.5-12.8, pref. 12.2-12.4, so as to half neutralise the soln. Al hydroxide is precipitated as sludge and the remaining alkaline soln. is decanted and returned to the pickling bath. Neutralisation is completed by further addns. of acid and, if required, the Al hydroxide sludge is diluted with water so that the Al conc. in the mixt. is 30-60 g/l. The Al hydroxide is coagulated by adding 0.05-0.2 g of an acrylic acid-acrylic acid amide copolymer (acrylic acid fraction 10-30%, spec. viscosity 1.6-1.9) per litre of Al hydroxide mixt. The water is finally drained from the coagulated product by filter presses. Spent acids use for the nuetralisation are pref. spent anodising solns. from the electrolytic oxidation of Al.

Granulated porous corundum prepn - from aluminium hydroxide or active alumina by heat-treatment in hydrogen fluoride atmos

Abstract: Granulated porous corundum having a homogeneous porous structure with summary pore vol. 0.3-1 cc/g and prevailing pore size 5000-30000 angstrom is prepd. by heat-treatment of Al hydroxide or active Al2O3 grains having a porous structure with summary pore vol. 0.3-1 cc/g and pore size 5000 angstrom. Temp. is increased from 20-700 degrees C for >=0.5 hrs. followed by heat-treatment at 700-1000 degrees C for >=0.5 hrs. and then at 1000-1400 degrees C for >=0.5 hrs. In 20-1000 degrees C range, heat-treatment takes place in an atmos. of HF, present in 0.01-2% concn. w.r.t. active Al2O3 wt. The granulated porous corundum is used for preparing catalyst carriers, heat- and refractory-insulators, heat carriers, inert matrices in chromatography.