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Silicon removal method of silicon-aluminum-containing material

A material, silicon-aluminum technology, applied in the field of desiliconization of silicon-aluminum-containing materials, can solve the problems of difficult desiliconization of high-silicon and aluminum-containing minerals, low silicon oxide dissolution rate, etc., and achieves low cost, good economic benefits, and removal rate. high effect

Inactive Publication Date: 2019-01-18
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of low silicon oxide dissolution rate in the traditional thermochemical alkali leaching desiliconization process of materials containing silicon and aluminum, and the difficulty of desiliconization of high-silicon and aluminum-containing minerals, the present invention proposes a desiliconization method for materials containing silicon and aluminum method, its technical scheme is as follows:

Method used

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Embodiment 1

[0033] According to the molar ratio of iron oxide: alumina in kaolin: carbon = 2.4:4:1.2 for batching and pelletizing. The dried pellets are placed in a corundum crucible, roasted in a reducing atmosphere, and the atmosphere is adjusted with coke. The roasting temperature is 1100°C, and the roasting time is 60 minutes; the obtained roasted clinker is finely ground to about d(0.5)=43.52 μm, and the roasted clinker is desiliconized by alkali leaching with sodium hydroxide alkali solution, the leaching temperature is 125°C, liquid-solid The ratio is 5, the caustic alkali concentration is 125g / L, and the leaching time is 120min. Under these conditions, the dissolution rate of silicon oxide is 91.13%, and the aluminum-silicon ratio of the leaching slag is 9.11.

Embodiment 2

[0035] According to the molar ratio of iron oxide: alumina in kaolin: carbon = 2.4:4:1.2 for batching and pelletizing. The dried pellets are placed in a corundum crucible, roasted in a reducing atmosphere, and the atmosphere is adjusted with coke. The roasting temperature is 1100°C, and the roasting time is 60 minutes; the obtained roasted clinker is finely ground to about d(0.5)=43.52 μm, and the roasted clinker is desiliconized by alkali leaching with sodium hydroxide alkali solution, the leaching temperature is 110°C, liquid-solid The ratio is 3, the caustic alkali concentration is 125g / L, and the leaching time is 120min. Under these conditions, the dissolution rate of silicon oxide is 87.04%, and the aluminum-silicon ratio of the leaching slag is 6.25.

Embodiment 3

[0037] According to the molar ratio of iron oxide: aluminum oxide: carbon = 2.4:4:1.2 in the high-silicon-containing silicon-aluminum material is used for batching and pelletizing. The dried pellets are placed in a corundum crucible, roasted in a reducing atmosphere, and the atmosphere is adjusted with coke. The roasting temperature is 1100°C, and the roasting time is 60 minutes; the obtained roasted clinker is finely ground to about d(0.5)=28.52 μm, and the roasted clinker is desiliconized by alkali leaching with sodium hydroxide alkali solution, the leaching temperature is 110°C, liquid-solid The ratio is 10, the caustic alkali concentration is 125g / L, and the leaching time is 120min. Under these conditions, the dissolution rate of silicon oxide is 77%, and the aluminum-silicon ratio of the leaching slag is 8.57.

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Abstract

The invention provides a silicon removal method of a silicon-aluminum-containing material. The silicon removal method comprises the following steps: taking iron oxide, the silicon-aluminum-containingmaterial and carbon powder and carrying out ore proportioning and grinding; then uniformly mixing to obtain a raw material, wherein the mol ratio of the iron oxide to aluminum oxide in the silicon-aluminum-containing material and carbon is (2 to 2.4) to 4 to (1 to 1.2); roasting the obtained raw material at 1050 to 1200 DEG C for 30 to 60min to obtain a clinker; after grinding the clinker, addinginto a sodium hydroxide solution and immersing with alkali; and carrying out solid-liquid separation on ore slurry obtained by alkali immersion to obtain silicon-containing alkali liquid and silicon removal dreg. According to the silicon removal method provided by the invention, aluminum and silicon in the silicon-aluminum material can be efficiently separated and the removal rate of silicon oxideis high. The silicon removal method has the advantages of simple technological flow and low cost, and silicon removal of aluminosilicate minerals including kaolin, illite, pyrophyllite and the like can be realized, and difficult-to-treat high-silicon aluminum-containing minerals including silicon-aluminum-containing material mill tailings, coal gangue, fly ash, a high-iron silicon-aluminum-containing material and the like can be subjected to silicon removal; and the silicon removal method has a wide application prospect and good economic benefits.

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. With the depletion of high-quality high-aluminum-silicon ratio ores, the development and utilization of low-aluminum-silicon ratio aluminum-containing resources with large reserves is of great significance and is imperative. 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 adding aluminum hydroxide seeds, and the remaining The sodium hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
Inventor 李小斌周秋生王洪阳彭志宏刘桂华齐天贵
Owner CENT SOUTH UNIV
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