Method of acid extracting aluminium from high-silicon alumina-containing raw mineral materials

A mineral raw material, high-silicon technology, applied in the field of aluminum extraction, can solve the problems of secondary pollution, residues and process wastewater containing fluorine, etc., and achieve the effect of less equipment corrosion, easy equipment materials, and easy operation

Active Publication Date: 2008-08-27
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although the addition of fluoride is beneficial to the dissolution of aluminum, the residue and process wastewater after aluminum extraction contain fluorine, causing secondary pollution

Method used

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  • Method of acid extracting aluminium from high-silicon alumina-containing raw mineral materials

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Experimental program
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Effect test

Embodiment 1

[0039] The coal gangue containing 38% alumina and 48% silica is crushed, ground to -0.038mm and 98% sulfuric acid is mixed in a mass ratio of 1:1.5, and calcined in a furnace or kiln at 400°C for 2 hours. After leaching at 60°C for 60 minutes, the leaching liquid has a weight ratio of 5:1, and then filtering to obtain an aluminum sulfate solution. The leaching rate of aluminum oxide is 90.45%.

Embodiment 2

[0041] The coal gangue containing 38% alumina and 48% silica is ground to -0.25mm and mixed with 98% sulfuric acid in a mass ratio of 1:2, and roasted in a furnace and kiln at 300°C for 4 hours. The roasting material is heated at 90°C. After leaching for 120 minutes, the weight ratio of leaching liquid to solid is 5:1, and then filtering to obtain an aluminum sulfate solution. The leaching rate of aluminum oxide is 82.27%.

Embodiment 3

[0043] Mix unmilled fly ash with 41% alumina and 48% silica and 98% sulfuric acid in a mass ratio of 1:2, roast in a furnace and kiln at 350°C for 3 hours, and leaching the roasting material with water at 80°C After 90 minutes, the leaching liquid has a solid weight ratio of 3:1, and then filtered to obtain an aluminum sulfate solution. The leaching rate of aluminum oxide is 81.22%.

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Abstract

The invention relates the method of extracting aluminium from high-silicon siliceous mineral. The method comprises the following steps: mixing the aluminous ore and sulfuric acid, baking, leaching with water, filtering leachate, getting aluminium sulphate solvent, thickening filter liquor, separating out aluminium sulphate, drying, dewatering, getting anhydrous aluminium sulphate; calcining aluminium sulphate, and getting Al2O3. The invention can extracte aluminium from high-silicon siliceous mineral, coal gangue, coal ash, China clay, andalusite, feldspath, ganister, nepheline and vermiculite without baking. The method has the advantages of simple technology, little corrosion, easy operation and high recovery ratio.

Description

Technical field [0001] A method for acid extraction of aluminum from high-silicon aluminum-containing mineral raw materials, which relates to the comprehensive utilization of low-grade and difficult-to-treat aluminum-containing mineral raw materials, in particular to high-silica bauxite and mainly aluminum silicate Method for extracting aluminum from high-silica aluminum-containing mineral raw materials such as coal gangue, fly ash, clay, kaolin, andalusite, feldspar, sillimanite, nepheline, vermiculite, etc. Background technique [0002] With the rapid development of modern industries, lack of resources has become one of the main social problems facing people. The raw material for the production of alumina is mainly bauxite. The traditional smelting method is the alkaline production of alumina. The silicon oxide in the ore is the main harmful element in the alkaline production. The ratio of aluminum to silicon in the bauxite is required to be A / S (ore The mass ratio of Al2O3 to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B21/00
CPCY02P10/20
Inventor 蒋开喜蒋训雄汪胜东王海北范艳青张利华李岚张邦胜刘三平赵磊林江顺冯亚萍王玉芳张磊
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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