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Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature

A technology of aluminosilicate and alumina, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of difficult separation of silicon and aluminum, high silicon content, etc., and achieve short roasting time, low decomposition temperature and low production cost Effect

Inactive Publication Date: 2015-03-18
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its stable structure and high silicon content, it is difficult to separate silicon and aluminum, so it has not been fully utilized and popularized for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Grind the feldspar finely, pass it through a 100-mesh sieve, and mix it uniformly according to the mass ratio of feldspar powder and 40wt% sodium hydroxide solution of 1.0:1.0, and then perform a hydrothermal reaction in a high-pressure vessel at a reaction temperature of 220°C , the pressure is 3MPa, the reaction time is 2h, the solid-liquid separation is obtained, and the potassium extraction mother liquor and the aluminum extraction clinker are obtained, and the potassium extraction mother liquor is used as the raw material for extracting potassium fertilizer;

[0023] (2) leaching the aluminum-extracting clinker obtained in step (1) with 25wt% sulfuric acid for 30 minutes, and the quality of the sulfuric acid used is twice the quality of the aluminum-extracting clinker, so that the aluminum in the clinker is dissolved into the liquid phase by reaction, and filtered and separated to remove Insoluble residue, ...

Embodiment 2

[0027] This embodiment includes the following steps:

[0028] (1) Grind the feldspar finely, pass it through a 100-mesh sieve, and mix it uniformly according to the mass ratio of feldspar powder and 40wt% sodium hydroxide solution of 1.0:1.5, and then perform hydrothermal treatment in a high-pressure container, and the reaction temperature is 240 ℃, The pressure is 4MPa, the reaction time is 2h, and the solid-liquid separation is performed to obtain potassium extraction mother liquor and aluminum extraction clinker, and the mother liquor is used as the raw material for potassium fertilizer extraction;

[0029] (2) leaching the aluminum-extracting clinker obtained in step (1) with 25wt% sulfuric acid for 30 minutes, and the quality of the sulfuric acid used is twice the quality of the aluminum-extracting clinker, so that the aluminum in the clinker is dissolved into the liquid phase by reaction, and filtered and separated to remove Insoluble residue, and then adjust the pH of t...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] (1) Grind the feldspar finely, pass it through a 100-mesh sieve, and mix it uniformly according to the mass ratio of feldspar powder and 45wt% sodium hydroxide solution of 1.0:2.0, and then carry out a hydrothermal reaction in a high-pressure container, and the reaction temperature is 240 ° C , the pressure is 4MPa, the reaction time is 2h, the solid-liquid separation is performed, and the potassium extraction mother liquor and the aluminum extraction clinker are obtained, and the mother liquor is used as the raw material for the extraction of potassium fertilizer;

[0035] (2) leaching the aluminum-extracting clinker obtained in step (1) with 25wt% sulfuric acid for 30 minutes, and the quality of the sulfuric acid used is twice the quality of the aluminum-extracting clinker, so that the aluminum in the clinker is dissolved into the liquid phase by reaction, and filtered and separated to remove Insoluble residue, th...

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Abstract

A process for producing alumina by low-temperature decomposition of aluminosilicate minerals, comprising the following steps: (1) After grinding the aluminosilicate minerals, the mass ratio of the aluminosilicate minerals to 20wt%-60wt% strong alkali solution is 1.0: The ratio of 0.5-2.5 is mixed evenly, and then hydrothermal reaction is carried out in a high-pressure container. The reaction temperature is 200°C-300°C, the pressure is 2MPa-6MPa, the reaction time is 1h-8h, and the solid-liquid separation is obtained. Aluminum clinker; (2) Leach the aluminum clinker with 5wt%-50wt% acid solution for 20min-40min, the amount of acid solution is 1-10 times the weight of the aluminum clinker, filter, and then adjust the aluminum-containing solution pH value to 8-10, solid-liquid separation to obtain filtrate and filter residue; (3) Calcination. The invention has the advantages of simple technological process, low decomposition temperature, short roasting time, low energy consumption, low production cost, good economic benefit and little environmental pollution.

Description

technical field [0001] The invention relates to a process for producing alumina, in particular to a process for producing alumina by low-temperature decomposition of aluminosilicate minerals. Background technique [0002] Alumina is an important industrial raw material, mainly used in the production of aluminum metal, and can also be used in chemical, electronic, ceramic and pharmaceutical industries. The traditional production process uses bauxite or diaspore type ore as raw material to extract alumina products. my country is a big producer of alumina, and our country is relatively poor in bauxite resources. It needs to import a large amount of bauxite resources, and its dependence on foreign countries is as high as 50%. With the continuous development of the world economy and the increasing shortage of bauxite resources, seeking aluminum-containing non-bauxite resources to replace some bauxite for alumina production will help alleviate the contradiction of the relative la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 谢超曾召刚孙成高杨三妹汤建良郑贤福高文远刘雨星邹娟
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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