Method for extracting aluminum oxide

A technology for aluminum oxide and aluminum hydroxide, applied in the field of aluminum oxide extraction, can solve the problems of difficult temperature control and stability in the sintering process, harsh equipment requirements, complex iron removal process, etc. The effect of using

Inactive Publication Date: 2014-04-02
BEIJING JIAYI CHUANGJING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its main disadvantages are strong corrosion of materials, strict requirements on equipment, complex iron removal process and high cost
[0006] There is also a process of extracting alumina by using ammo

Method used

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  • Method for extracting aluminum oxide

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Effect test

Embodiment 1

[0030] Heat ammonium sulfate to 250°C, decompose for 2 hours to generate ammonium bisulfate, and ammonium bisulfate is made into a solution with a concentration of 70% by mass; at the same time, the generated ammonia gas is recovered with water to prepare ammonia water. Grind the fly ash containing 45% alumina and 43% silica to 325 mesh, and mix according to the molar ratio of alumina / ammonium bisulfate in the fly ash as 1:20. Under stirring conditions, raise the temperature of the mixture of fly ash and ammonium bisulfate solution to 180°C, react for 300 minutes, cool the mixture to 95°C and filter to obtain a solution containing ammonium aluminum sulfate, silicon slag, and alumina in fly ash The reaction rate of converting to aluminum ammonium sulfate was 88%. Aluminum ammonium sulfate solution cools down to precipitate crystals, and after purification, it is made into aluminum ammonium sulfate solution, which reacts with ammonia water to form aluminum hydroxide. Aluminum h...

Embodiment 2

[0032] Heat ammonium sulfate to 500°C, decompose for 15 minutes to generate ammonium bisulfate, and make ammonium bisulfate into a solution with a concentration of 10% by mass; at the same time, recover the generated ammonia gas with water to prepare ammonia water. Grind the fly ash containing 42% alumina and 51% silica to 400 mesh, and mix according to the molar ratio of alumina / ammonium bisulfate in the fly ash to 1:3. Under stirring conditions, raise the temperature of the mixture of fly ash and ammonium bisulfate solution to 400°C, react for 10 minutes, cool the mixture to 100°C and filter to obtain a solution containing ammonium aluminum sulfate, silicon slag, and alumina in fly ash The reaction rate of converting to aluminum ammonium sulfate was 61%. Aluminum ammonium sulfate solution cools down to precipitate crystals, and after purification, it is made into aluminum ammonium sulfate solution, which reacts with ammonia water to form aluminum hydroxide. Aluminum hydroxi...

Embodiment 3

[0034] Heat ammonium sulfate to 265°C, decompose for 1.5 hours to generate ammonium bisulfate, and ammonium bisulfate is made into a solution with a concentration of 98% by mass; at the same time, the generated ammonia gas is recovered with water to prepare ammonia water. Grind coal gangue containing 43% alumina and 46% silica to 400 mesh, and mix according to the molar ratio of alumina / ammonium bisulfate in fly ash to 1:7. Under stirring conditions, raise the temperature of the mixture of fly ash and ammonium bisulfate solution to 50°C, react for 45 minutes, cool the mixture to 92°C and filter to obtain a solution containing ammonium aluminum sulfate and silicon slag, alumina in fly ash The reaction rate of converting to aluminum ammonium sulfate was 83%. Aluminum ammonium sulfate solution cools down to precipitate crystals, and after purification, it is made into aluminum ammonium sulfate solution, which reacts with ammonia water to form aluminum hydroxide. Aluminum hydroxi...

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Abstract

The invention relates to a method for extracting aluminum oxide. The method comprises the following steps: heating and decomposing ammonium sulfate to generate ammonium hydrogen sulfate or ammonia gas, preparing an ammonium hydrogen sulfate solution, and collecting the ammonia gas for preparing ammonia water; grinding coal ash, mixing the coal ash with the ammonium hydrogen sulfate solution according to a certain ratio, heating while stirring, and reacting to generate ammonium aluminum sulfate; re-crystallizing and purifying ammonium aluminum sulfate to prepare an ammonium aluminum sulfate solution, and reacting with the ammonia water to generate aluminum hydroxide; drying aluminum hydroxide and roasting to generate aluminum oxide. According to the method, aluminum oxide can be extracted from not only the coal ash but also aluminum-containing raw materials such as coal gangue, slag, bauxite, red mud, tailings, kaolin and mullite; the technological process is shorter, equipment is simple, and large-scale industrialization production is easy to realize.

Description

technical field [0001] The invention relates to a method for extracting alumina, in particular to a method for extracting alumina from aluminum-containing raw materials such as fly ash, coal gangue and bauxite by using ammonium sulfate. Background technique [0002] my country's thermal power plants produce hundreds of millions of tons of fly ash every year, and a large amount of coal gangue waste is also produced during the coal mining process. A large amount of low-grade bauxite and tailings are also produced during the bauxite mining process. During the production process of the alumina plant A large amount of red mud is produced. These solid wastes not only occupy a large amount of land for storage, but also cause serious air pollution and water pollution. [0003] The main form of utilization of these solid wastes is to produce building materials, and also to produce alumina with fly ash and coal gangue, which are generally divided into two categories: alkali method and ...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 冯亮
Owner BEIJING JIAYI CHUANGJING SCI & TECH
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