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

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 extracting aluminum from high-silicon and aluminum-containing mineral raw materials by acid method, involving comprehensive utilization of a low-grade, refractory aluminum-containing mineral raw material, especially involving high-silicon bauxite and aluminosilicate as the main A method for extracting aluminum from high-silicon and aluminum-containing mineral raw materials such as coal gangue, fly ash, clay, kaolin, andalusite, feldspar, sillimanite, nepheline, and vermiculite. Background technique

[0002] With the rapid development of modern industry, resource scarcity has become one of the main social problems facing people. The raw material for producing alumina is mainly bauxite. The traditional smelting method is the production of alumina by the alkali method. The silicon oxide in the ore is the main harmful element in the production by the alkali method. The ratio of aluminum to silicon in the bauxite is required to be A / S (ore The...

Examples

Embodiment 1

[0039] Crush and grind coal gangue containing 38% alumina and 48% silica to -0.038mm and mix it with 98% sulfuric acid at a mass ratio of 1:1.5, and roast it in a furnace or kiln at 400°C for 2 hours. Leach at 60°C for 60 minutes, the weight ratio of leaching liquid to solid is 5:1, and then filter to obtain aluminum sulfate solution, the leaching rate of aluminum oxide is 90.45%.

Embodiment 2

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

Embodiment 3

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

technical field

[0001] A method for extracting aluminum from high-silicon and aluminum-containing mineral raw materials by acid method, involving comprehensive utilization of a low-grade, refractory aluminum-containing mineral raw material, especially involving high-silicon bauxite and aluminosilicate as the main A method for extracting aluminum from high-silicon and aluminum-containing mineral raw materials such as coal gangue, fly ash, clay, kaolin, andalusite, feldspar, sillimanite, nepheline, and vermiculite. Background technique

[0002] With the rapid development of modern industry, resource scarcity has become one of the main social problems facing people. The raw material for producing alumina is mainly bauxite. The traditional smelting method is the production of alumina by the alkali method. The silicon oxide in the ore is the main harmful element in the production by the alkali method. The ratio of aluminum to silicon in the bauxite is required to be A / S (ore The...

Examples

Embodiment 1

[0039] Crush and grind coal gangue containing 38% alumina and 48% silica to -0.038mm and mix it with 98% sulfuric acid at a mass ratio of 1:1.5, and roast it in a furnace or kiln at 400°C for 2 hours. Leach at 60°C for 60 minutes, the weight ratio of leaching liquid to solid is 5:1, and then filter to obtain aluminum sulfate solution, the leaching rate of aluminum oxide is 90.45%.

Embodiment 2

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

Embodiment 3

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

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