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A kind of high-efficiency and rapid desiliconization method of bauxite

A bauxite and desiliconization technology, which is applied in the field of bauxite desiliconization, can solve the problems of long dissolution time, high concentration of lye, and fluctuations, and achieve short desilication time, high recovery rate, and no tailings Effect

Active Publication Date: 2019-12-17
国家电投集团山西铝业有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The disadvantage is that the concentration of lye used is high, and the dissolution time is long, which takes 5 to 10 hours
[0006] Looking back at the whole process and development process of alumina, it can be seen that alumina production is mainly divided into: dissolution process, decomposition process and evaporation process, each of which accounts for about 1 / 3 of the cost, and the processes of decomposition process and evaporation process are basically stable and mature , but the dissolution process and red mud properties have been changing with the properties of ore and processing methods, and in order to reduce the impact of silicon minerals, research has not stopped

Method used

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  • A kind of high-efficiency and rapid desiliconization method of bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 18

[0043] An efficient and rapid desilication method for diaspore-type bauxite, and the composition analysis results of bauxite are shown in Table 1.

[0044] Silicon dissolution step: mix bauxite with lye to prepare a reaction slurry, the content of sodium oxide in the lye is 77.5g / L, the liquid-solid ratio of the reaction slurry is 20, the grinding of bauxite in the reaction slurry The ore fineness is -200 mesh and the content is 90%. The reaction slurry reacts and dissolves silicon in a microwave reactor. The frequency of the microwave reactor is 2450MHz, the reaction temperature is 80°C, and the reaction time is 5min. After the reaction, the reaction liquid is separated into solid and liquid. The resulting liquid phase is a silicon-containing solution.

[0045] The silicon-containing solution is not desiliconized, and is directly returned for processing the next batch of bauxite, and lye is added to the silicon-containing solution to keep the liquid-solid ratio of the prepare...

Embodiment 19

[0050] An efficient and rapid desilication method for diaspore-type bauxite, and the composition analysis results of bauxite are shown in Table 1.

[0051] Silicon dissolution step: mix bauxite with sodium hydroxide solution to prepare a reaction slurry, the content of sodium oxide in the sodium hydroxide solution is 77.5g / L, the liquid-solid ratio of the reaction slurry is 20, and the aluminum in the reaction slurry The grinding fineness of the earth ore is -200 mesh and the content is 60%. The reaction slurry reacts and dissolves silicon in a microwave reactor. The frequency of the microwave reactor is 2450MHz, the reaction temperature is 70°C, and the reaction time is 10min. Thermal rapid solid-liquid separation, the obtained liquid phase is a silicon-containing sodium hydroxide solution, the obtained solid phase is washed with hot water at 50-100°C, and then undergoes secondary silicon dissolution treatment;

[0052] The obtained solid phase is subjected to secondary silic...

Embodiment 20

[0057] An efficient and rapid desilication method for diaspore-type bauxite, and the composition analysis results of bauxite are shown in Table 6.

[0058] Table 6

[0059] chemical composition Al 2 o 3

SiO 2

A / S Percentage (%) 58.44 17.03 3.43

[0060] Silicon dissolution step: mix bauxite with sodium hydroxide solution to prepare a reaction slurry, the content of sodium oxide in the sodium hydroxide solution is 150g / L, the liquid-solid ratio of the reaction slurry is 10, and the bauxite in the reaction slurry The grinding fineness of the ore is -200 mesh and the content is 95%. The reaction slurry reacts and dissolves silicon in a microwave reactor. The frequency of the microwave reactor is 2450MHz, the reaction temperature is 105°C, and the reaction time is 10min. Rapid solid-liquid separation, the obtained liquid phase is a silicon-containing sodium hydroxide solution, the obtained solid phase is washed with hot water at 100°C, and the...

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Abstract

The invention belongs to the technical field of bauxite desiliconization, and specifically discloses a high-efficiency and rapid desilication method of bauxite. The high-efficiency and rapid desiliconization method of bauxite includes the steps of: mixing bauxite with alkaline solution to prepare a reaction slurry, the liquid-solid ratio of the reaction slurry is 2-50, the reaction slurry is reacted in a microwave reactor to dissolve silicon, and the reaction temperature is 10 ~130℃, reaction time 2~220min, after the reaction, the reaction liquid is separated into solid and liquid, and the obtained liquid phase is a silicon-containing solution, and SiO in the silicon-containing solution 2 The content is 0.3~50g / L. The high-efficiency and rapid desilication method of bauxite provided by the present invention is carried out in a microwave reactor for reaction desilication, and by determining the liquid-solid ratio of the reaction slurry, reaction temperature and reaction time, high-efficiency dissolution in a relatively short period of time is realized. The purpose of silicon in bauxite. The method of the invention realizes the purification and recovery of the silicon minerals in the bauxite so that the silicon minerals do not enter into the red mud, thus greatly reducing the amount of red mud produced in alumina production.

Description

technical field [0001] The invention relates to the technical field of bauxite desiliconization, in particular to a method for high-efficiency and rapid desilication of bauxite. Background technique [0002] The traditional production process of alumina production from bauxite is mainly Bayer method, sintering method and so on. So far, 90% of the world's aluminum companies are using the Bayer process. The Bayer method includes two main processes, that is, two patents proposed by Bayer. One is that he found that the sodium aluminate solution with a molar ratio of sodium oxide to aluminum oxide of 1.8 can With continuous stirring, the aluminum oxide in the solution can be slowly precipitated in the form of aluminum hydroxide until the molar ratio of sodium oxide to aluminum oxide is increased to 6, most of the aluminum hydroxide has been precipitated, and the remaining solution can be dissolved when heated. Alumina hydrate in bauxite is also the process of dissolving bauxite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/06
CPCC01F7/0613C01F7/06
Inventor 陈湘清李花霞郑慧慧
Owner 国家电投集团山西铝业有限公司
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