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Preparation method for mullite by using white mud or fly ash and prepared mullite

A technology of mullite and fly ash, which is applied in the field of making mullite from white mud or fly ash and the prepared mullite, which can solve the problems of increasing energy consumption, introducing impurities, and many preparation steps, so as to save The effect of energy consumption

Active Publication Date: 2017-10-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the addition of a binder, which not only requires many preparation steps but also introduces impurities
Adding water will increase the energy consumption of the subsequent sintering process

Method used

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  • Preparation method for mullite by using white mud or fly ash and prepared mullite
  • Preparation method for mullite by using white mud or fly ash and prepared mullite
  • Preparation method for mullite by using white mud or fly ash and prepared mullite

Examples

Experimental program
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Effect test

preparation example 1

[0050] For the fly ash from Shenhua Zhunzi Company, the composition analysis results obtained by the full chemical analysis method are shown in Table 1.

[0051] Table 1

[0052]

[0053] The fly ash is subjected to the acid method to extract aluminum, specifically, the hydrochloric acid solution with a mass content of 28% and the fly ash are reacted for 1 hour at a liquid-solid ratio of 4:1, and after the reaction is completed, filter, wash, and dry to obtain alumina. The solid residue obtained is lime mud.

[0054] The obtained lime mud (remaining residue) is analyzed through the total chemical analysis method, and the composition analysis results are shown in Table 2,

[0055] Table 2

[0056]

[0057] T Fe 2 o 3 Indicates a mixture of oxides of ferric and ferric iron.

Embodiment 1

[0059] This example illustrates the method for producing mullite from white clay of the present invention.

[0060] The lime mud that 1kg preparation example 1 obtains is put into SF flotation machine (Hongxing Mining Machinery Co., Ltd.), and contains diesel oil and sodium carbonate solution (diesel content is 0.4% by weight, sodium carbonate content is 0.3% by weight) phase with 5kg Contact and carry out flotation decarbonization to obtain decarbonized white mud; then decarbonized white mud and sodium hydroxide solution (concentration is 60g / L) according to the weight ratio (liquid-solid ratio) of sodium hydroxide solution and decarbonized white mud: 4:1 desiliconization at a desiliconization temperature of 90°C for 30 minutes to obtain desiliconized white mud; then put the desiliconized white mud into a superconducting magnetic separator to remove Fe and magnetic induction successively at a magnetic induction of 3T Remove Ti at 5T to obtain demagnetized white mud; then put ...

Embodiment 2

[0067] This example illustrates the method for producing mullite from white clay of the present invention.

[0068] The lime mud that 1kg preparation example 1 obtains is put into the SF flotation machine, and the solution (the kerosene content is 0.2% by weight, and the waterglass content is 0.5% by weight) that contains kerosene and water glass with 4kg is contacted and carries out flotation decarbonization, Obtain decarbonized white mud; then decarbonized white mud and sodium hydroxide solution (concentration is 40g / L) according to the weight ratio (liquid-solid ratio) of sodium hydroxide solution and decarbonized white mud is 3:1 at the desiliconization temperature Carry out desiliconization at 95°C for 40 minutes to obtain desiliconized white mud; then put the desiliconized white mud into a superconducting magnetic separator, remove Fe at a magnetic induction of 2T and remove Ti at a magnetic induction of 4T to obtain Demagnetized white mud; then put the demagnetized whit...

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Abstract

The invention relates to the using field of remaining residues of fly ash or aluminum-containing minerals after extraction of aluminum, and provides a preparation method for mullite by using white mud or the fly ash and prepared mullite. The preparation method for the mullite by using the white mud comprises the following steps: successively carrying out decarburization, desilication, magnetic separation, carbon removal, pickling, water washing, molding and sintering on the white mud to obtain the mullite, wherein the white mud is the remaining residues which are obtained by extracting aluminum of the aluminum-containing minerals. The method can effectively prepare the white mud or fly ash to obtain the mullite with high phase content and high refractoriness, and provides beneficial applications of the remaining residues which are obtained by extracting aluminum of the fly ash and the aluminum-containing minerals.

Description

technical field [0001] The invention relates to the utilization field of fly ash or the remaining residue after aluminum extraction of aluminium-containing minerals, and in particular relates to a method for producing mullite from white mud or fly ash and the prepared mullite. Background technique [0002] Mullite is a mineral formed by aluminosilicate at high temperature, and mullite will be formed when aluminosilicate is artificially heated. It is usually artificially synthesized by sintering or electric melting. Mullite is a high-quality refractory material, which has the characteristics of uniform expansion, excellent thermal shock stability, high load softening point, small high-temperature creep value, high hardness, and good chemical corrosion resistance. At present, there are mainly high-purity Fused mullite, ordinary fused mullite, all natural bauxite concentrate sintered mullite and light fired mullite. [0003] "Application and Preparation Progress of Mullite Ce...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185C04B35/622C01F7/02C04B35/626
CPCC01F7/02C04B35/185C04B35/622C04B35/62605C04B35/66
Inventor 刘晓婷王宝冬孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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