Processing technique for high-purity mullite

A processing technology, mullite technology, applied in the field of mullite processing technology, can solve the problems of difficult temperature rise, high liquid phase, poor sintering, etc., and achieve improved thermal shock resistance, corrosion resistance, and limit temperature , the effect of stable quality

Active Publication Date: 2011-08-03
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the limitation of tunnel kiln firing method and kiln body structure, the energy consumption and auxiliary material consumption of tunnel kiln are relatively high, and the natural gas consumption per ton of product is about 300-350M 3 , which is 5 times that of the high-temperature shaft kiln, and the product firing carrier - the kiln car, has higher material loss and maintenance costs
[0006] 2. The production capacity of the kiln is low, it is difficult to increase the output, and the price competitive advantage of the product is not obvious
[0007] 3. The whole equipment has large investment, long process route, large land occupation, high labor intensity, and it is not easy to realize automation
[0008] 4. Due to the large temperature difference between the upper and lower sides of the tunnel kiln, it is difficult to raise the temperature, and sometimes it is necessary to solve the problem of poor sintering of the lower layer by backfiring, which increases the production cost
The raw materials of this patented technology mostly use natural materials. Due to the high content of silicon, iron, titanium and other elements in natural raw materials, it is difficult to control the impurity content of the finished product; Phase content tends to be below 85%
According to the current processing technology, mullite products have high impurity content and high liquid phase content, and there is still a lot of room for improvement in its comprehensive performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Ingredients

[0028] Weigh 600 kg of imported γ-type primary industrial alumina and 450 kg of kaolin with an aluminum content of 44%;

[0029] Prepare dispersant: weigh 0.08 kg of ethylene glycol and 0.025 kg of ammonium chloride, and mix them evenly;

[0030] Step 2: Grinding

[0031] Add a dispersant to the above raw materials, mix, and grind to a fineness of 1 μm in a continuous ball mill.

[0032] Step Three: Form a Ball

[0033] Weigh 105 kg of water and 5.25 kg of starch; add the starch into the water and mix well; the powder passes through the feeding device, and the mixture of water and starch passes through the water adding device, and is gradually and evenly added to the disc-type ball forming machine to process the billets and billets Diameter control 10mm.

[0034] Step Four: Drying

[0035] Put the billet into the dryer to dry;

[0036] Step 5: High temperature sintering

[0037] The dried billet is sent to the shaft kiln for sintering, the s...

Embodiment 2

[0041] Step 1: Ingredients

[0042] Weigh 400 kg of imported γ-type primary industrial alumina and 550 kg of kaolin with an aluminum content of 50%;

[0043] Dispersant preparation: Weigh 5.28 kg of ethylene glycol and 4.22 kg of ammonium chloride, and mix them evenly;

[0044] Step 2: Grinding

[0045] Add a dispersant to the above raw materials, mix, and grind to a fineness of 5 μm in a continuous ball mill.

[0046] Step Three: Form a Ball

[0047] Weigh 285 kg of water and 9.5 kg of starch; add the starch into the water and mix evenly; the powder passes through the feeding device, and the mixture of water and starch passes through the water adding device, and is gradually and evenly added to the disc-type ball forming machine to process the ball blank and the ball blank The diameter is controlled to 20mm.

[0048] Step Four: Drying

[0049] Put the billet into the dryer to dry;

[0050] Step 5: High temperature sintering

[0051] The dried billets are sent to the sh...

Embodiment 3

[0055] Step 1: Ingredients

[0056] Weigh 500 kg of imported γ-type primary industrial alumina and 500 kg of kaolin with an aluminum content of 50%;

[0057] Prepare dispersant: weigh 10 kg of ethylene glycol and 5 kg of ammonium chloride, and mix them evenly;

[0058] Step 2: Grinding

[0059] Add a dispersant to the above raw materials, mix, and grind to a fineness of 10 μm in a continuous ball mill.

[0060] Step Three: Form a Ball

[0061] Weigh 450 kg of water and 50 kg of starch; add the starch into the water and mix evenly; the powder passes through the feeding device, and the mixture of water and starch passes through the water adding device, and is gradually and evenly added to the disc-type ball forming machine to process the billets and billets Diameter control 30mm.

[0062] Step Four: Drying

[0063] Put the billet into the dryer to dry;

[0064] Step 5: High temperature sintering

[0065] The dried billet is sent to the shaft kiln for sintering, the sinterin...

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Abstract

The present invention relates to a technique for processing high-purity mullite. The invention relates to the technique for processing the mullite. The technique takes gamma-Al2O3 and kaolin as raw materials, wherein, the kaolin is kaolin with an aluminum content between 44 and 55 percent, and the mixture ratio by weight portion of the gamma-Al2O3 to the kaolin is 40-60 to 45-55. The technique comprises the following steps: firstly, 0.01 to 1.5 percent of dispersant by weight is thrown into the mixture and uniformly stirred, and then the mixture is thrown into a dry continuous grinding mill for processing until the fineness d50 is between 1 and 10 mu; secondly, powder materials after grinding, water and a binding agent are uniformly added into a bowl granulator and processed into a ball blank, and the weight ratio of the powder materials to the water to the binding agent is 1 to 0.10-0.45 to 0.005-0.05; thirdly, the ball blank is dried; fourthly, the dried ball blank is thrown into a vertical kiln for sintering and heated up to between 1,700 and 1,850 DEG C, and the time is between 10 and 30 hours; and fifthly, the high-purity mullite is prepared after product inspection and sorting, crushing, sieving, deferrization and packaging. The content of mullite crystal phase in the finished product prepared by the technique is over 95 percent; and no glass phase exists and a small amount of corundum phase exists. The finished product has high purity, stable quality, greatly improved fire resistance, thermal shock resistance and corrosion resistance, and greatly improved limiting temperature.

Description

technical field [0001] The present invention relates to the processing technology of mullite, especially a kind of γ-Al 2 o 3 The processing technology of producing mullite with crystal phase content not less than 85% with high-purity kaolin as raw material. Background technique [0002] Mullite (English Mullite) is a high-purity sintered refractory raw material, which is widely used in metallurgy, ceramics, glass, chemical industry and other industries. . [0003] Jiangdu New Jinghui Refractory Co., Ltd. started the research of sintering and synthesizing high-purity mullite in the 1980s. The product was put on the market in batches in 1988. The product process includes the following steps: a. The ingredients are selected γ-Al 2 o 3 And high-purity kaolin as the main raw material. b. Add water for ultra-fine grinding. c. Press filtration and dehydration. d. Vacuum mud making. e. High temperature sintering in tunnel kiln at 1700-1850℃. f. Crushing, screening, iron re...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B35/64C04B33/04C04B35/10C04B35/622
Inventor李正坤
OwnerJIANGSU JINGXIN NEW MATERIAL