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Method for desiliconizing silicon and aluminum containing material

A material, silicon-aluminum technology, which is applied in the field of desiliconization of silicon-aluminum materials, can solve the problems of low silicon oxide dissolution rate and difficult desiliconization of high-silicon and aluminum-containing minerals, so as to increase the added value of products, improve the purity, and improve the economy. Significant effect

Active Publication Date: 2018-11-27
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the problem of low silicon oxide dissolution rate in the traditional thermal chemical alkali leaching desiliconization process of silicon-containing aluminum materials, and the difficulty of desiliconization of high-silicon and aluminum-containing minerals, the present invention proposes a chemical desiliconization of silicon-containing aluminum materials method, its technical scheme is as follows:

Method used

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  • Method for desiliconizing silicon and aluminum containing material
  • Method for desiliconizing silicon and aluminum containing material

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Experimental program
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Effect test

Embodiment 1

[0037] The molar ratio of iron oxide: alumina in kaolin: carbon = 1.1:2:1.1 is used for batching, and after roasting in a reducing atmosphere at 1100°C for 60 minutes, it is oxidized and roasted at 900°C for 30 minutes; the obtained roasted clinker is finely ground to less than 74μm , use sodium hydroxide solution to desilicate roasted clinker by alkali leaching, the leaching temperature is 110°C, the liquid-solid ratio is 5, the concentration of sodium hydroxide solution is 160g / L, and the leaching time is 120min. Under these conditions, the silicon oxide The dissolution rate was 90.5%.

[0038] Add digested calcium oxide to the silicon-containing alkali solution obtained by desiliconization according to the ratio of calcium-silicon molecular ratio of 1:1, hydrothermally react at 110°C for 5 hours, the silicon precipitation rate reaches 95.7%, and the sodium hydroxide obtained by separation The solution can be returned to the alkali leaching desiliconization process to contin...

Embodiment 2

[0041] The molar ratio of iron oxide: alumina in kaolin: carbon = 1.1:2:1.1 is used for batching, and after roasting in a reducing atmosphere at 1050°C for 60 minutes, it is oxidized and roasted at 950°C for 30 minutes; the obtained roasted clinker is finely ground to less than 74μm , use sodium hydroxide solution to desilicate roasted clinker by alkali leaching, the leaching temperature is 110°C, the liquid-solid ratio is 5, the concentration of sodium hydroxide solution is 160g / L, and the leaching time is 120min. Under these conditions, the silicon oxide The dissolution rate was 90.1%.

[0042] Add digested calcium oxide to the silicon-containing alkali solution obtained by desiliconization according to the ratio of calcium to silicon molecular ratio of 1:1, and react hydrothermally at 110°C for 5 hours, the silicon precipitation rate reaches 95.02%, and the sodium hydroxide obtained by separation The solution can be returned to the alkali leaching desiliconization process t...

Embodiment 3

[0045] The molar ratio of iron oxide: alumina in kaolin: carbon = 1.2:2:1.2 is used for batching, and after roasting in a reducing atmosphere at 1100°C for 60 minutes, it is oxidized and roasted at 1000°C for 30 minutes; the obtained roasted clinker is finely ground to less than 74μm , using sodium hydroxide solution to desilicate roasted clinker by alkali leaching, the leaching temperature is 110°C, the liquid-solid ratio is 3, the concentration of sodium hydroxide solution is 200g / L, and the leaching time is 120min. Under these conditions, the silicon oxide The dissolution rate was 89.87%.

[0046] Add digested calcium oxide to the silicon-containing alkali solution obtained by desiliconization according to the ratio of calcium to silicon molecular ratio of 1:1, hydrothermal reaction at 110°C for 5 hours, the silicon precipitation rate reaches 95.01%, and the sodium hydroxide obtained by separation The solution can be returned to the alkali leaching desiliconization process ...

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Abstract

The invention provides a method for desiliconizing a silicon and aluminum containing material. The method comprises the following steps that ferric oxide, the silicon and aluminum containing materialand carbon powder are taken to be subjected to ore blending, grinding and uniform mixing, and a raw material is obtained; the raw material is calcined in reducing atmosphere at the temperature of 1050DEG C to 1200 DEG C, and a reduced calcined material is obtained; the obtained reduced calcined material is calcined in oxidizing atmosphere at the temperature of 900 DEG C to 1000 DEG C, and calcined clinker is obtained; the obtained calcined clinker is subjected to grinding, alkaline leaching and solid-liquid separation, and then silicon containing alkali liquor and desiliconized slag are obtained. According to the method, aluminum oxide and silicon oxide in the silicon and aluminum containing material are efficiently separated, the method is also suitable for desiliconizing high-silicon aluminum containing mineral hard to treat, and silicon containing alkali liquor and red mud can be comprehensively utilized. The purity degree of aluminum oxide and the product additional value can be effectively improved, waste emissions are reduced, and the economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of mineral engineering, in particular to a method for desiliconizing materials containing silicon and aluminum. Background technique [0002] my country is the world's largest producer of alumina, with an annual output of more than 60 million tons of alumina in 2017. The alumina industry plays an important role in the development of the national economy. More than 90% of the total industrial alumina output is used for electrolytic production of metal aluminum, and the rest is widely used in chemical, ceramic, pharmaceutical and electronic fields. The Bayer process is a chemical process widely used in industry to produce alumina from materials containing silicon and aluminum. Invented by Austrian engineer Karl Joseph Bayer in 1887, its basic principle is to convert aluminum hydroxide into sodium aluminate with concentrated sodium hydroxide solution, and re-precipitate aluminum hydroxide by diluting and addin...

Claims

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Application Information

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IPC IPC(8): C01B33/24C01F7/06
CPCC01B33/24C01F7/06C01F7/0613C01P2004/61C01P2006/65
Inventor 李小斌王洪阳周秋生彭志宏刘桂华齐天贵项敏
Owner CENT SOUTH UNIV
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