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Method for producing alumina through series process

A technology of alumina and tandem method, which is applied in the direction of alumina/aluminum hydroxide, etc., which can solve the problems that the tandem method cannot be used to produce alumina, sintering cannot be carried out, and ring formation

Active Publication Date: 2012-09-19
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the Bayer red mud produced by the Bayer process usually contains iron. In the above method, because the molecular ratio of sodium oxide to alumina and iron oxide is only controlled to be 0.90 to 1.05, a large amount of sodium ferrite is generated during the sintering process. Difficulty in firing
For example, when the content of sodium ferrite exceeds 8%, the ringing of the sintering material in the sintering kiln is very serious during the sintering process, which affects the normal progress of sintering and requires frequent maintenance. When the ringing is serious, even sintering cannot be carried out. Therefore, it is impossible to realize the true series production of alumina

Method used

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  • Method for producing alumina through series process
  • Method for producing alumina through series process
  • Method for producing alumina through series process

Examples

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example 1

[0060] The bauxite used is diaspore-type bauxite, which is first processed by the Bayer process to obtain the Bayer process red mud. After testing, it is found that the weight ratio of alumina to silicon dioxide in the Bayer process red mud is 1.0. The cleaned Bayer process red mud is mixed with sodium carbonate, crushed lime and anthracite to make sintered raw meal, in which the molecular ratio of calcium oxide to the remaining iron oxide after the formation of sodium ferrite is controlled to be 1.4, and the molecular ratio of sodium oxide to aluminum oxide is 1.01, the molecular ratio of calcium oxide to silicon oxide is 1.9, and the sintered raw meal is sintered at a temperature of 1130°C±20°C to obtain sintered clinker. Dissolution is carried out on the sintered clinker, wherein the dissolution is carried out under the conditions that the alumina concentration is 80g / L, and the liquid-solid ratio is 6, so as to obtain the sintering method dissolution pulp. Use a separation...

example 2

[0062] The bauxite used is diaspore type bauxite, which is first processed by the Bayer process to obtain the Bayer process red mud. After testing, the weight ratio of alumina to silicon dioxide in the Bayer process red mud is 1.3. The cleaned Bayer process red mud is mixed with sodium carbonate, crushed lime and anthracite to make sintered raw meal, in which the molecular ratio of calcium oxide to the remaining iron oxide after the formation of sodium ferrite is controlled to be 1.5, and the molecular ratio of sodium oxide to aluminum oxide is 1.0, the molecular ratio of calcium oxide to silicon oxide is 2.0, and the sintered raw meal is sintered at a temperature of 1170°C±20°C to obtain sintered clinker. Dissolution is carried out on the sintered clinker, wherein the dissolution is carried out under the conditions that the alumina concentration is 90g / L and the liquid-solid ratio is 6.5 to obtain the sintering method dissolution pulp. Use a separation and settling tank to se...

example 3

[0064] The bauxite used is boehmite and gibbsite-type bauxite. First, it is processed by the Bayer process to obtain the Bayer process red mud. After testing, it is found that the weight ratio of alumina to silica in the Bayer process red mud is is 1.5. The cleaned Bayer process red mud is mixed with sodium carbonate, crushed lime and anthracite to make sintered raw meal, in which the molecular ratio of calcium oxide to the remaining iron oxide after the formation of sodium ferrite is controlled to be 1.55, and the molecular ratio of sodium oxide to aluminum oxide is 1.01, the molecular ratio of calcium oxide to silicon oxide is 2.05, and the sintered raw meal is sintered at a temperature of 1150°C±20°C to obtain sintered clinker. Dissolution is carried out on the sintered clinker, wherein the dissolution is carried out under the conditions that the alumina concentration is 100g / L and the liquid-solid ratio is 7, so as to obtain the sintering method dissolution pulp. Use a se...

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Abstract

The invention relates to a method for producing alumina through a series process, comprising the following steps of: dissolving alumyte through a Bayer process to obtain Bayer process red mud with the aluminum-silicon weight ratio of 1.0-2.0; adding sodium carbonate and limestone or lime to the Bayer process red mud, sintering to obtain sintered clinker aggregates, and controlling the molecular ratio of calcium to iron in the sintered clinker aggregates to be 1-1.5, the molecular ratio of sodium to aluminum to be 1-1.05 and the molecular ratio of calcium to silicon to be 2.0-2.05; dissolving the sintered clinker aggregates to obtain sintering process dissolving ore pulp; separating sintering process red mud from the sintering process dissolving ore pulp to obtain sintering process dissolving serosity; mixing the sintering process dissolving serosity with Bayer process dissolving ore pulp, diluting, and desiliconizing; separating the Bayer process red mud from the desiliconized separating overflows; precipitating aluminum hydroxide from the separating overflows separated from the Bayer process red mud, and separating and roasting the aluminum hydroxide to obtain the alumina. The method has the advantages of easy raw slurry sintering and enhanced quality and dissolution rate of the sintered clinker aggregates, thereby improving the dissolution rate of the alumina.

Description

technical field [0001] The invention relates to a method for producing alumina, in particular to a method for producing alumina in series. Background technique [0002] Since the aluminum industry came out at the end of the 19th century, it has developed very rapidly. Aluminum is used extensively in many sectors of modern industrial technology as well as in everyday life. This is because aluminum and its alloys have many excellent properties, and the resources of aluminum are very rich. From 1890 to 1900, the total output of metal aluminum in the world was about 28,000 tons. By the mid-1950s, the output of aluminum had surpassed that of copper, ranking first in non-ferrous metals. In 1990, the world's primary aluminum output was about 16 million tons, accounting for about 40% of the world's total output of non-ferrous metals. [0003] Alumina is the main raw material for electrolytic aluminum smelting. From a global perspective, most of the current alumina production use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 徐月和覃波曲修雁刘建军徐华军史更生
Owner CHINA ENFI ENGINEERING CORPORATION