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Method for preparing chemical aluminum oxide by andalusite mine

A technology of andalusite and alumina, which is applied in the field of chemical alumina preparation, can solve the problems of complex process and high production cost, and achieve the effect of simple process, low production cost and good dispersion effect

Inactive Publication Date: 2009-12-23
王云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although such a technology is feasible, its disadvantage is that the process is relatively complicated and the production cost is relatively high.

Method used

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  • Method for preparing chemical aluminum oxide by andalusite mine

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Effect test

Embodiment 1

[0031] The first step: batching, mixing and grinding, making furnace charge pellets

[0032] Mixing 86 parts by weight of andalusite and 114 parts by weight of limestone, crushing and pulverizing, grinding into a powder with a particle size of 75-120 microns, and pressing the powder into pellets;

[0033] The second step: sintering and self-crushing

[0034] Put the prepared charge pellets into the sintering furnace, roast at 1300°C for 60 minutes, and then cool to 50°C to obtain andalusite self-grinding material;

[0035] The third step: leaching, filtering

[0036] Put the self-grinding material into the leaching tank and add Na at a concentration of 8%. 2 CO 3 solution and stir to mix, since the pulverized material and Na 2 CO 3 The weight ratio of the solution is 1:2.8, heating the mixed mineral material to 85°C, mechanically stirring for 60 minutes, and the stirring speed is 1100r / min, and then vacuum filtering the mixed mineral material to remove the slag to obtain ...

Embodiment 2

[0045] The first step: batching, mixing and grinding, making furnace charge pellets

[0046] After mixing 90 parts by weight of andalusite ore and 110 parts by weight of limestone, crushing and pulverizing, grinding the powder into a powder with a particle size of 75-120 microns, and pressing the powder into furnace charge pellets;

[0047] The second step: sintering and self-crushing

[0048] Put the prepared charge pellets into the sintering furnace, roast at 1350°C for 50 minutes, and then cool to 60°C to obtain andalusite self-grinding material;

[0049] The third step: leaching, filtering

[0050]Put the self-grinding material into the leaching tank, and add Na with a concentration of 8.5% 2 CO 3 solution and stir to mix, since the pulverized material and Na 2 CO 3 The weight ratio of the solution is 1:2.5, heating the mixed mineral material to 90°C, mechanically stirring for 50 minutes, and the stirring speed is 1200r / min, and then vacuum filtering the mixed mineral...

Embodiment 3

[0059] The first step: batching, mixing and grinding, making furnace charge pellets

[0060] After mixing 80 parts by weight of andalusite ore and 120 parts by weight of an activator, crushing and grinding into a powder with a particle size of 75-120 microns, and pressing the powder into pellets;

[0061] The second step: sintering and self-crushing

[0062] Put the prepared charge pellets into the sintering furnace, roast at 1200°C for 60 minutes, and then cool to 40°C to obtain andalusite self-grinding material;

[0063] The third step: leaching, filtering

[0064] Put the self-grinding material into the leaching tank, and add Na with a concentration of 7.5% 2 CO 3 solution and stir to mix, since the pulverized material and Na 2 CO 3 The weight ratio of the solution is 1:3, heating the mixed mineral material to 80°C, mechanically stirring for 70 minutes, and the stirring speed is 1000r / min, and then vacuum filtering the mixed mineral material to remove the slag to obtai...

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Abstract

The invention discloses a method for preparing chemical aluminum oxide by andalusite mine, comprising the following preparation steps: carrying out batch feeding, mixing and grinding, charging material ball pressing, sintering and automatic grinding, leaching, filtering, carbonization, spray pyrolysis or calcination to prepare aluminum oxide with content being greater than 99.5%. The invention has the characteristics of simple process, sufficient source of raw materials, low production cost, no pollution and the like; in addition, the slag produced in the process of production can be used for producing cement, so that andalusite mine with sufficient reserve volume can be rationally utilized. The chemical aluminum oxide of the invention has the characteristics of good whiteness, fine granularity, good activity and the like.

Description

technical field [0001] The invention relates to the field of chemical alumina preparation, more specifically, to a method for preparing chemical alumina from andalusite ore. Background technique [0002] With the rapid development of various professional fields such as petroleum, chemical industry, electronics, and construction in China, the demand for various high-quality, refined, and specialized industrial raw materials is increasing. Chemical alumina, that is, non-metallurgical alumina, is an important raw material for industrial production and is widely used in the fields of petroleum, chemical industry, electronics, ceramics, rubber, plastics, construction and refractory materials. At present, the production of alumina mainly uses bauxite as raw material, and its production methods are mainly subtractive methods, including Bayer method, sintering method and combined method. Since my country is relatively poor in bauxite resources, it is necessary to develop and utiliz...

Claims

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Application Information

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IPC IPC(8): C01F7/20
Inventor 卢惠民
Owner 王云
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