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Production of aluminium hydrate from aluminium ash

A technology of aluminum hydroxide and aluminum ash, which is applied in the preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, aluminum sulfur compounds, aluminum sulfate, etc., can solve the problems of waste of resources, secondary pollution of the environment, etc., and achieve cost reduction Low cost, avoid secondary pollution, and simple method

Inactive Publication Date: 2006-08-16
杜梅生 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the phase transformation of alumina into α-alumina at high temperature, it is insoluble in acid and alkali, so this method only utilizes a small amount of metallic aluminum in aluminum ash, and a large amount of alumina is not well utilized, which not only causes waste of resources , and the hydrochloric acid used will cause secondary pollution to the environment

Method used

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  • Production of aluminium hydrate from aluminium ash

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Effect test

Embodiment 1

[0016] Embodiment one: a kind of method utilizing aluminum ash to prepare aluminum hydroxide, it comprises the following steps: 1. aluminum ash and solid sodium carbonate are mixed by weight ratio 100:100 and stirred in the mixer; 2. solid mixture is put into Melt in a high-temperature furnace at 1100°C for 3 hours; ③Put the molten material in a leaching tank and soak it in clean water for 12 hours, and remove the non-polluting red mud sediment to leave a sodium aluminate solution; ④Molar ratio of aluminum Sodium acid: sulfuric acid is 2: 1. Add sulfuric acid to the sodium aluminate solution in the reaction kettle; ⑤ Use a filter to separate the solid and liquid from the mixed solution to obtain aluminum hydroxide precipitate and sodium sulfate solution; ⑥ Add aluminum hydroxide After the precipitate is dried and pulverized at 60°C, the finished aluminum hydroxide product can be obtained, and the sodium sulfate solution can be evaporated and dried to obtain the chemical raw mat...

Embodiment 2

[0017] Embodiment two: a kind of method that utilizes aluminum ash to prepare aluminum hydroxide, it comprises the following steps: 1. aluminum ash and solid sodium carbonate are mixed by weight ratio 100:80 and stirred in the blender; 2. solid mixture is put into Melt in a high-temperature furnace at 900°C for 5 hours; ③Put the molten material in a leaching tank and soak it in clean water for 15 hours, and remove the non-polluting red mud sediment to leave a sodium aluminate solution; ④Molar ratio of aluminum Sodium acid: sulfuric acid is 2: 0.95. Add sulfuric acid to the sodium aluminate solution in the reaction kettle; ⑤ Use a filter to separate the solid and liquid from the mixed solution to obtain aluminum hydroxide precipitate and sodium sulfate solution; ⑥ Add aluminum hydroxide After the precipitate is dried and pulverized at 80°C, the finished product of aluminum hydroxide can be obtained, and the sodium sulfate solution can be evaporated and dried to obtain the chemic...

Embodiment 3

[0018] Embodiment three: a kind of method that utilizes aluminum ash to prepare aluminum hydroxide, it comprises the following steps: 1. aluminum ash and solid sodium carbonate are mixed by weight ratio 100: 120 and stirred in the mixer; 2. solid mixture is put into Melt in a high-temperature furnace at 1500°C for 1 hour; ③Put the molten material in a leaching tank and soak it in clean water for 10 hours, remove the non-polluting red mud sediment and leave a sodium aluminate solution; ④Molar ratio of aluminum Sodium acid: sulfuric acid is 2: 1.05. Add sulfuric acid to the sodium aluminate solution in the reaction kettle; ⑤ Use a filter to separate the solid and liquid from the mixed solution to obtain aluminum hydroxide precipitate and sodium sulfate solution; ⑥ Add aluminum hydroxide After the precipitate is dried and pulverized at 40°C, the finished product of aluminum hydroxide can be obtained, and after the sodium sulfate solution is evaporated and dried, the chemical raw m...

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Abstract

Production of aluminum hydrate from aluminum ash is carried out by mixed agitating in proportion=100:80-120 of aluminum ash and solid sodium carbonate, melting solid mixture at 900-1500 degrees C for 1-5hrs, immersing melts in water above 10hrs, removing deposits to obtain sodium aluminate solution, adding sulfuric acid into sodium aluminate solution in proportion=2:0.9-1.1mol, solid-liquid separating by filter to obtain aluminum hydrate deposits and sodium sulfate solution, drying aluminum hydrate deposits at 20-80 degrees C and crushing to obtain final product. It is cheap and simple, has no environmental pollution and uses of regenerative resources fully.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide, in particular to a method for preparing aluminum hydroxide by utilizing aluminum ash. Background technique [0002] During the processing and smelting of aluminum, local oxidation and nitriding usually occur to form alumina and aluminum nitride. These alumina and aluminum nitride are mixed with some metal aluminum to form aluminum slag. For a long time, many enterprises have used aluminum slag to process recycled aluminum, but the aluminum ash left after the aluminum slag has been refined and recycled has become a major problem that has plagued people for many years. [0003] The composition of aluminum ash is very complex, mainly composed of alumina and aluminum nitride, and there are still a small amount of metal aluminum, iron, nickel, zinc, manganese, copper, silicon, etc. Aluminum ash produced by aluminum slag processing and recycled aluminum industry accumulates everywhere It is...

Claims

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Application Information

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IPC IPC(8): C01F7/08C01F7/74
Inventor 杜梅生于从周
Owner 杜梅生
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