Method for enhancing desilicication of low-grade bauxite by utilizing brown fused alumina fly ash

Abstract

The invention discloses a method for enhancing desilicication of low-grade bauxite by utilizing brown fused alumina fly ash. The method comprises the following steps: adding the brown fused alumina fly ash into pre-roasted low-grade bauxite, and then carrying out desilicication. The method has the characteristics that operation is simple, the bauxite desilicication effect is better, the brown aluminum oxide fly ash is turned into wealth, and the technological process is environment-friendly.

Description

technical field

[0001] The invention relates to a method for desiliconization of low-grade bauxite, in particular to a method for strengthening the desiliconization of low-grade bauxite by using brown corundum dust removal. Background technique

[0002] In recent years, with the rapid development of my country's aluminum industry, the demand for high-quality bauxite has also increased rapidly. However, due to the low proportion of bauxite resources in my country, the poor grade, and the high silicon content, its utilization is greatly limited. As a result, my country's aluminum industry remains highly dependent on overseas resources. In order to improve the utilization rate of domestic low-grade bauxite resources and reduce the dependence on overseas resources, the use of "calcination activation-alkali melting desilication" technology is considered to be a feasible method. In order to further improve the grade of bauxite and increase the ratio of aluminum to silicon in alumi...

Examples

Embodiment 1

[0033] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0034] (1) Grind the low-grade bauxite pre-roasted at 800°C for 60 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then remove the low-grade bauxite and brown corundum dust in a mass ratio of 7:1 well mixed;

[0035] (2) get 20g mixture and add it in the sodium hydroxide solution of 120g / L of 180mL, stirring speed is set to 300r / min, lye temperature is 95 ℃, desiliconization time 30min;

[0036] (3) After liquid-solid separation, aluminum concentrate and desiliconization liquid are obtained, and the desiliconization liquid is causticized by adding calcium oxide, which can be reused in the process of alkali-dissolving desilication.

[0037] In this experiment, by analyzing the composition of aluminum concentrate and desiliconization liquid, and weighing the quality of the ...

Embodiment 2

[0039] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0040] (1) Grind the low-grade bauxite pre-roasted at 850°C for 50 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then remove the low-grade bauxite and brown corundum dust in a mass ratio of 5:1 well mixed;

[0041] (2) get 10g mixture and add it in the sodium hydroxide solution of 120mL of 150g / L, stirring speed is set to 300r / min, lye temperature is 95 ℃, desiliconization time 40min;

[0042] (3) After liquid-solid separation, aluminum concentrate and desilication liquid are obtained. The desilication liquid is causticized by adding calcium oxide, and can be reused in the process of alkali-dissolving desilication.

[0043] In this experiment, by analyzing the composition of the aluminum concentrate and the desilication solution, and weighing the quality of the residue...

Embodiment 3

[0045] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0046] (1) Grind the low-grade bauxite pre-roasted at 900°C for 40 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then the low-grade bauxite and brown corundum dust are mixed in a mass ratio of 7:1 well mixed;

[0047] (2) get 20g mixture and add in the sodium hydroxide solution of 130g / L of 150mL, stirring speed is set to 500r / min, lye temperature is 105 ℃, desiliconization time 20min;

[0048] (3) After liquid-solid separation, aluminum concentrate and desilication liquid are obtained. The desilication liquid is causticized by adding calcium oxide, and can be reused in the process of alkali-dissolving desilication.

[0049] In this experiment, by analyzing the composition of aluminum concentrate and desilication liquid, and weighing the quality of the residue, formula...

technical field

[0001] The invention relates to a method for desiliconization of low-grade bauxite, in particular to a method for strengthening the desiliconization of low-grade bauxite by using brown corundum dust removal. Background technique

[0002] In recent years, with the rapid development of my country's aluminum industry, the demand for high-quality bauxite has also increased rapidly. However, due to the low proportion of bauxite resources in my country, the poor grade, and the high silicon content, its utilization is greatly limited. As a result, my country's aluminum industry remains highly dependent on overseas resources. In order to improve the utilization rate of domestic low-grade bauxite resources and reduce the dependence on overseas resources, the use of "calcination activation-alkali melting desilication" technology is considered to be a feasible method. In order to further improve the grade of bauxite and increase the ratio of aluminum to silicon in alumi...

Examples

Embodiment 1

[0033] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0034] (1) Grind the low-grade bauxite pre-roasted at 800°C for 60 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then remove the low-grade bauxite and brown corundum dust in a mass ratio of 7:1 well mixed;

[0035] (2) get 20g mixture and add it in the sodium hydroxide solution of 120g / L of 180mL, stirring speed is set to 300r / min, lye temperature is 95 ℃, desiliconization time 30min;

[0036] (3) After liquid-solid separation, aluminum concentrate and desiliconization liquid are obtained, and the desiliconization liquid is causticized by adding calcium oxide, which can be reused in the process of alkali-dissolving desilication.

[0037] In this experiment, by analyzing the composition of aluminum concentrate and desiliconization liquid, and weighing the quality of the ...

Embodiment 2

[0039] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0040] (1) Grind the low-grade bauxite pre-roasted at 850°C for 50 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then remove the low-grade bauxite and brown corundum dust in a mass ratio of 5:1 well mixed;

[0041] (2) get 10g mixture and add it in the sodium hydroxide solution of 120mL of 150g / L, stirring speed is set to 300r / min, lye temperature is 95 ℃, desiliconization time 40min;

[0042] (3) After liquid-solid separation, aluminum concentrate and desilication liquid are obtained. The desilication liquid is causticized by adding calcium oxide, and can be reused in the process of alkali-dissolving desilication.

[0043] In this experiment, by analyzing the composition of the aluminum concentrate and the desilication solution, and weighing the quality of the residue...

Embodiment 3

[0045] A method for strengthening the desilication of low-grade bauxite by utilizing brown corundum dust removal, the method is as follows:

[0046] (1) Grind the low-grade bauxite pre-roasted at 900°C for 40 minutes, so that the minerals with particle size less than 74 μm account for more than 75% of the total mass, and then the low-grade bauxite and brown corundum dust are mixed in a mass ratio of 7:1 well mixed;

[0047] (2) get 20g mixture and add in the sodium hydroxide solution of 130g / L of 150mL, stirring speed is set to 500r / min, lye temperature is 105 ℃, desiliconization time 20min;

[0048] (3) After liquid-solid separation, aluminum concentrate and desilication liquid are obtained. The desilication liquid is causticized by adding calcium oxide, and can be reused in the process of alkali-dissolving desilication.

[0049] In this experiment, by analyzing the composition of aluminum concentrate and desilication liquid, and weighing the quality of the residue, formula...

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