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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TL;DR: In this article, the ability of prebuilt aluminium hydroxide flocs to adsorb humic acids is a function of experimental jartest conditions, such as slow mixing time and gradient velocity mixing values.
Abstract: The purpose of this study is to show that the ability of prebuilt aluminium hydroxide flocs to adsorb humic acids is function of experimental jartest conditions. The results indicate that : I/ The size of the preformed flocs is depending of the slow mixing time and of the gradient velocity mixing values. 2/ The adsorption capacity depend of the size of the floes showing that the electrostatic and ionic exchange mechanisms are mainly effective at the area of the adsorbent material. The efficiency of aluminium salts to remove humic acids are, in decrease order : WAC, aluminium sulphate, aluminium chloride, aluminium nitrate.
10 citations
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01 Feb 1990
TL;DR: In this article, basic calcium aluminium hydroxide dicarboxylates of formula CaxAl2(OH)2(x+2)A.mH2O (I) are claimed.
Abstract: (1) Basic calcium aluminium hydroxide dicarboxylates of formula CaxAl2(OH)2(x+2)A.mH2O (I) are claimed; x = 2-8; m = 0-12; A = anion of an aliphatic, aromatic or heteroaromatic dicarboxylic acid or a combination. (2) (I) are produced by reaction of mixts. of Ca(OH)2 and/or CaO, Al(OH)3 and NaOH, or of Ca(OH)2 and/or CaO and NaAlO2, with the corresp. acid AH2 in the amts. required in aq. medium, followed by sepn. and working up by known methods. Pref. x = 3-6, m = 2-4, and A = fumarate or phthalate; reaction is carried out at 25-100 deg.C.
10 citations
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20 Apr 1983
TL;DR: In this article, the authors propose a composite which intumesces to form a heat insulating char when exposed to fire and useful for protecting structural steelwork, consisting of a resin film forming binder, such as an epoxy resin, a spumific agent such as melamine phosphate in a weight ratio of less than 7.5:1, up to 20% by weight of an aromatic hydroxy compound such as catechol or salicylic acid, and optionally a filler such as ceramic fibres consisting of more than 50% by the weight of aluminium hyd
Abstract: A composition which intumesces to form a heat insulating char when exposed to fire and useful for protecting structural steelwork, comprises (a) a resin film forming binder, such as an epoxy resin, (b) a spumific agent such as melamine phosphate in a weight ratio of less than 7.5:1, (c) up to 20% by weight of an aromatic hydroxy compound such as catechol or salicylic acid, and optionally (d) a filler such as ceramic fibres consisting of more than 50% by weight of aluminium hydroxide.
10 citations
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TL;DR: In this paper, the influence of ultrasonic waves on the hydrogen ion concentration of colloids have been studied and it has been found that the sols of antimony sulfide, arsenious sulphide, stannic hydroxides, chromium hydroxide, vanadium pentoxide and manganese dioxide show slight decrease in pH values.
Abstract: The influence of ultrasonic waves on the hydrogen ion concentration of several colloids have been studied It has been found that the sols of antimony sulphide, arsenious sulphide, stannic hydroxide, chromium hydroxide, vanadium pentoxide and manganese dioxide show slight decrease in pH values. On the other hand the sols of prussian blue, copper ferrocyanide, uranium ferrocyanide, aluminium hydroxide and cerium hydroxide show an increase and that of ferric arsenate, ferric phosphate and ferric hydroxide do not show any change in pH values. Further the sols of antimony sulphide, arsenic sulphide, manganese dioxide and uranium ferrocyanide coagulate on prolonged exposure and ceric hydroxide sol sets to a gel.
9 citations
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01 Apr 2009TL;DR: The data presented show that ultrasonic spectrometry, although a novel tool for sol-gel studies, is beneficial for the non-invasive monitoring of the latter stages of aluminium (oxy)hydroxide formation and its eventual breakdown in the presence of excess base.
Abstract: The sol–gel transformation of aqueous solutions of aluminium ions into aluminium (oxy)hydroxides induced by the addition of a ‘soft base’—‘Tris-buffer’ ( p K a = 8.2 ) has been investigated using monotonous single-batch titrations and a combination of four complimentary techniques for monitoring pH, conductivity, viscosity and ultrasound parameters (velocity and attenuation). The multi-probe monitoring of the formation of aluminium (oxy)hydroxides enabled important stages of the sol–gel transformation process including: the structural conversion of aluminium Keggin-like polynuclear clusters into nanoparticles of aluminium (oxy)hydroxide; the aggregation of primary nuclei of aluminium (oxy)hydroxide into larger particles, and the ‘arrested growth’ of the aggregates with the formation of the three-dimensional gel network to be followed. The effect of aluminium ion molecular speciation on the sol–gel transformation stages is discussed. The data presented show that ultrasonic spectrometry, although a novel tool for sol–gel studies, is beneficial for the non-invasive monitoring of the latter stages of aluminium (oxy)hydroxide formation and its eventual breakdown in the presence of excess base.
9 citations