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Method for preparing fused mullite from bauxite under coal

A technology of electric melting mullite and bauxite, which is applied in the field of refractory materials, can solve the problems of high content of impurities such as iron and sulfur, poor endowment of bauxite, low aluminum content, etc., to achieve large processing capacity, good crystal development, The effect of high sorting efficiency

Pending Publication Date: 2022-05-10
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The endowment of bauxite under coal is not as good as that of conventional bauxite. Generally, the content of aluminum is low, and the content of impurities such as iron and sulfur is high. There are certain technical difficulties and economic benefits in development and utilization.

Method used

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  • Method for preparing fused mullite from bauxite under coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, a method for preparing fused mullite from bauxite under coal, specifically:

[0030] (1) Main components of bauxite under coal, w(Al 2 o 3 ) is 54.40%, w(SiO 2 ) is 19.35%, w(Fe 2 o 3 ) is 7.34%, w(S) is 0.52%, w(TiO 2 ) is 2.50%, w(Na 2 O+K 2 O) is 0.48%; after the bauxite under the coal is graded and eliminated 2 o 3 ) to 4.06%, w (S) to 0.11%, to obtain intermediate minerals;

[0031] (2) Send the intermediate minerals into the rotary kiln for 4 hours for calcination, and the calcination temperature is 1150°C to obtain bauxite clinker;

[0032] (3) The bauxite clinker is crushed to ≤1.5mm, and then 90wt% of the bauxite clinker, 7.0wt% silica, 1.8wt% coke (charcoal) and 1.2wt% sawdust are mixed to obtain the batch;

[0033] (4) Send the batch material into an electric arc furnace at 1950°C for high temperature melting for 1.5 hours; after cooling for 24 hours, crush, classify, and remove iron by magnetic separation (magnetic field ...

Embodiment 2

[0035] Such as figure 1 As shown, a method for preparing fused mullite from bauxite under coal, specifically:

[0036] (1) Main components of bauxite under coal, w(Al 2 o 3 ) is 59.12%, w(SiO 2 ) is 14.37%, w(Fe 2 o 3 ) is 3.38%, w(S) is 0.36%, w(TiO 2 ) is 2.25%, w(Na 2 O+K 2 O) is 0.44%; after the bauxite under the coal is graded and eliminated 2 o 3 ) to 2.71%, w (S) to 0.09%, to obtain intermediate minerals;

[0037] (2) The intermediate minerals are then sent to a rotary kiln for calcination for 5 hours at a calcination temperature of 1200°C to obtain bauxite clinker;

[0038] (3) The bauxite clinker is broken to less than 1.5mm, and then after mixing the bauxite clinker of 88wt%, the silica of 9.5%wt, the coke (charcoal) of 1.5%wt and the sawdust proportioning of 1wt%, get batch materials;

[0039] (4) Send the batch material into an electric arc furnace at 2000°C for high temperature melting for 0.9h; after cooling for 35h, crush, classify, and remove iron by m...

Embodiment 3

[0041] Such as figure 1 As shown, a method for preparing fused mullite from aluminum under coal, specifically:

[0042] (1) Main components of bauxite under coal, w(Al 2 o 3 ) is 64.24%, w(SiO 2 ) is 14.70%, w(Fe 2 o 3 ) is 2.12%, w(S) is 0.27%, w(TiO 2 ) is 2.55%, w(Na 2 O+K 2 O) is 0.47%; the bauxite under the coal is graded and eliminated 2 o 3 ) to 1.6%, w(S) to 0.06%, to obtain intermediate minerals;

[0043] (2) The intermediate minerals are then sent to a rotary kiln for calcination for 3 hours at a calcination temperature of 1250°C to obtain bauxite clinker;

[0044] (3) The bauxite clinker is broken to less than 1.5mm, and then 90wt% bauxite clinker, 8.5wt% silica, 1.0wt% coke (charcoal) and 0.5wt% sawdust are mixed evenly to obtain a compound material;

[0045] (4) The batch material is sent to 2050°C electric arc furnace for high temperature melting for 0.7h; after cooling for 40h, it is crushed, classified, and magnetically separated to remove iron (magn...

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Abstract

The invention provides a method for preparing electro-fused mullite from bauxite under coal, which comprises the following steps: grading the bauxite under coal, and removing silt; obtaining + d-grade minerals, and carrying out iron removal and desulfurization on the + d-grade minerals by adopting an X-ray concentrating machine to obtain intermediate minerals; calcining the intermediate mineral to obtain bauxite clinker; the preparation method comprises the following steps: crushing bauxite clinker, adding auxiliary materials, and uniformly mixing to obtain a mixture; melting the mixture in an electric arc furnace at a high temperature, cooling and crystallizing, and then crushing, grading and deironing to obtain a mullite product. According to the method, the under-coal bauxite is adopted as the main raw material to produce the fused mullite, the content of mullite phases in the mullite product is 95% or above, the comprehensive utilization rate of under-coal aluminum resources and the added value of the product are increased, the channel of the mullite raw material is widened, and sustainable high-quality development of the refractory material industry is powerfully supported.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a method for preparing fused mullite from bauxite under coal. Background technique [0002] Refractory materials are used as structural materials for thermal equipment such as high-temperature kilns, as well as high-temperature containers and components for industry. It is an indispensable and important supporting material for various high-temperature industrial thermal kilns and equipment. The scientific progress and technological development of the refractory industry play an irreplaceable and important role in the development of the high temperature industry. Among them, mullite is a high-quality refractory material with high chemical stability. It shows strong corrosion resistance in carbonated flux, alkaline flux and glass melt, and is widely used in metallurgy, glass , ceramics, chemistry, electric power, national defense, gas and cement industries; at the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3463C04B2235/3272C04B2235/42C04B2235/3232C04B2235/3201C04B2235/77C04B2235/9607
Inventor 吕子虎程宏伟赵登魁吴东印
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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