scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Book ChapterDOI
01 Jan 1991
TL;DR: In this article, the authors applied a sulfuric acid-containing nutrient solution to an artificial plant growth medium which contained Al(OH)3 precipitated on montmorillonite (interlayer-Al(OH), and calculated the activity of Al, K, SO4 and other ions with MINTEQA1.
Abstract: Acid deposition is an environmental concern of global importance. One of the major deleterious effects of acid deposition on the lithosphere is aluminium mobilization in the soil environment and consequent aluminium toxicity to terrestrial vegetation and aquatic biota. We applied a sulfuric acid-containing nutrient solution to an artificial plant growth medium which contained Al(OH)3 precipitated on montmorillonite (interlayer-Al(OH)3). We determined pH and total concentrations of Al, Ca, Mg, K, Na, So4, Cl, NO3 and PO4 in leachate solutions and calculated the activity of Al, K, SO4 and other ions with MINTEQA1, a computer speciation program. We found that Al activity was controlled by interlayer-Al(OH)3 when 2pH + pSO4 was less than 12.7, as long as this phase was not depleted. When 2pH + pSO4 was more than 12.7, the Al activity followed a line parallel to crystalline alunite, implying an unknown Al-controlling phase of the same Al/S/K/OH ratio, but more soluble than the crystalline alunite. We propose that this unknown phase is amorphous alunite. The re-examination of several sets of published data for naturally-acidic surface and ground waters, mine waste drainage water, and solutions from acidic soils and sediments revealed that the Al activity in those solutions fell between what would be expected for equilibrium with the proposed amorphous alunite (upper limit) and the crystalline alunite (lower limit). This implies that an alunite-like aluminium sulfate may have controlled Al activity in natural environments that were influenced by sulfate and proton input from either natural or manmade causes.

4 citations

Patent
23 Jul 2014
TL;DR: In this paper, a later-addition ore calcification transformation method in an aluminum oxide production process was proposed. And the method can be used for improving the recovery efficiency of the aluminium oxide in bauxite and realizing the zero discharge of solid waste materials in the production process; the flow rate of materials and the energy consumption in a dissolution process can also be reduced by adopting a later calcium addition method.
Abstract: The invention relates to the field of aluminium oxide production, and particularly relates to a later-addition ore calcification transformation method in an aluminum oxide production process. The method comprises the following steps: extracting aluminium oxide from aluminium-containing ores in a sodium aluminate solution by adopting a high-temperature dissolving manner, and adding a calcium-containing material to ore pulp in a cooling process after dissolving so as to ensure that a silicon-containing phase in dissolution slag completely enters calcified slag; carrying out carbonization transformation, aluminium dissolution, aluminium settlement and the like on the calcified slag so as to obtain calcium aluminate which is used as a calcium source in a later-addition ore calcification transformation process, wherein main components of aluminium-dissolved slag are calcium silicate and calcium carbonate, so that the aluminium-dissolved slag can be directly used as the raw material of the cement industry; and carrying out solid-liquid separation, decomposition and the like on a solution generated in a pressurizing dissolution process so as to obtain aluminium hydroxide, and calcining the aluminium hydroxide so as to obtain aluminium oxide. The method can be used for improving the recovery efficiency of the aluminium oxide in bauxite and realizing the zero discharge of solid waste materials in the production process; the flow rate of materials and the energy consumption in a dissolution process can also be reduced by adopting a later calcium addition method; and the method is a high-efficiency environmental-friendly aluminum oxide production method.

4 citations

Patent
20 Jul 1981
TL;DR: The apatite gives a final pH that is more alkaline, minimising the proteolytic activity of gastric pepsin this article, which is similar to that of calcium carbonate but the final pH is around 6.
Abstract: Antacid agents containing at least one apatite are new. The duration of neutralisation is similar that of calcium carbonate but the final pH is around 6, which prevents acid hypersecretion. There is less risk of calcium ions passing into the blood due to the low solubility of the apatite in the intestine. Compared with aluminium hydroxide, apatite gives a final pH that is more alkaline, minimising the proteolytic activity of gastric pepsin.

4 citations

Patent
Neil Brown1
04 Jul 2002
TL;DR: In this article, an aluminium hydroxide having an average particle size in the range of 2 to 4 µm and a specific surface area according to the BET in range of 8 to 12 m 2 /g which is obtained by ball-milling was described.
Abstract: The invention relates to an aluminium hydroxide having an average particle size in the range of 2 to 4 µm and a specific surface area according to BET in the range of 8 to 12 m 2 /g which is obtained by ball-milling.

4 citations

Patent
11 Feb 2015
TL;DR: In this article, a comprehensive utilization method for low-grade bauxite is proposed, which includes following steps of mixing the low grade bauxites with hydrochloric acid after ore grinding, performing solid liquid separation and washing after the reaction is cooled.
Abstract: The invention relates to a comprehensive utilization method for bauxite and particularly relates to a comprehensive utilization method for low-grade bauxite. The method includes following steps of: (1) mixing the low-grade bauxite with hydrochloric acid after ore grinding; (2) performing solid liquid separation and washing after the reaction is cooled; (3) adding the solution obtained in the step (2) into a sodium hydroxide solution to obtain an aluminium hydroxide precipitate, an iron hydroxide precipitate and a sodium chloride solution, performing solid liquid separation, and washing; (4) preparing the aluminium hydroxide and iron hydroxide solid obtained in the step (3) into metallurgy-level aluminum oxide and high-iron slag through a simple Bayer process; (5) subjecting the sodium chloride solution obtained in the step (3) to electrolysis by an ionic exchange membrane electrolytic cell to obtain hydrogen, chlorine and a sodium hydroxide solution; and (6) returning the sodium hydroxide solution that is discharged from an ionic membrane cathode zone in the step (5) into the step (3) and recycling. The method is obvious in environment protection effects, and effectively separates aluminum, iron and silicon in the low-grade bauxite to achieve comprehensive utilization.

4 citations


Network Information
Related Topics (5)
Particle size
69.8K papers, 1.7M citations
75% related
Scanning electron microscope
74.7K papers, 1.3M citations
70% related
Calcium
78.5K papers, 2.2M citations
69% related
Adsorption
226.4K papers, 5.9M citations
69% related
Copper
122.3K papers, 1.8M citations
68% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202123
202031
201936
201863