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A kind of mullite silicon carbide microporous aggregate and preparation method thereof

A technology of mullite silicon carbide and microporous bone, which is applied in the field of microporous aggregates, can solve the problems of high-efficiency and comprehensive utilization of uncrystallized silicon cutting waste liquid, immature recycling process, and discharge of solid waste, etc., to improve product quality Effect of adding value, reducing the probability of merger and growth, and saving processing costs

Inactive Publication Date: 2019-03-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the recycling of cutting waste liquid is based on the recycling of polyethylene glycol, which leads to the discharge of a large amount of solid waste, which not only causes a large waste of resources, but also brings serious pollution to the environment.
In recent years, relying on physical methods to realize the recovery of silicon carbide powder and elemental silicon in the cutting waste liquid has also been related to patent technology reports, but because this recovery process is not mature enough, it not only requires high equipment, but also brings huge energy consumption, economic Poor benefit
In addition to the above purification process, there are currently no reports on the efficient and comprehensive utilization of crystalline silicon cutting waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A mullite silicon carbide microporous aggregate and a preparation method thereof. First, 45~50wt% bauxite raw meal and 50~55wt% crystalline silicon cutting waste liquid are used as raw materials, and 0.5~3.0wt% anthracite is added to the raw materials, mixed evenly, pressed and formed under the condition of 20~30MPa, and dried naturally , baked at 60~85°C for 12~19h; then raised the temperature to 1350~1400°C, kept it warm for 1~7h, then cooled naturally to room temperature, and crushed to obtain mullite silicon carbide microporous aggregate.

[0022] The mullite silicon carbide microporous aggregate prepared in Example 1 is tested: the average pore diameter is 1.1~1.2 μm; the proportion of pores 3 The closed porosity is 10~14%; the compressive strength at room temperature is 120~135MPa; the thermal conductivity at 1000°C is 1.0~1.2W / (m•k).

Embodiment 2

[0024] A mullite silicon carbide microporous aggregate and a preparation method thereof. First, 50~55wt% of bauxite raw meal and 45~50wt% of crystalline silicon cutting waste liquid are used as raw materials, and 1.0~3.5wt% of bamboo charcoal powder is added to the raw materials, mixed evenly, and pressed under the condition of 25~35MPa. Drying, baking at 65-90°C for 13-20h; then raising the temperature to 1400-1450°C, keeping it warm for 2-8h, then cooling naturally to room temperature, crushing to obtain mullite silicon carbide microporous aggregate.

[0025] The mullite silicon carbide microporous aggregate prepared in Example 2 is tested: the average pore diameter is 1.0-1.1 μm; the proportion of pores 3 The closed porosity is 12~16%; the compressive strength at room temperature is 125~140MPa; the thermal conductivity at 1000°C is 0.9~1.1W / (m•k).

Embodiment 3

[0027] A mullite silicon carbide microporous aggregate and a preparation method thereof. First, 55~60wt% bauxite raw meal and 40~45wt% crystalline silicon cutting waste liquid are used as raw materials, and 1.5~4.0wt% dextrin is added to the raw materials, mixed evenly, and pressed under the condition of 30~40MPa. Drying, baking at 70-95°C for 14-21h; then raising the temperature to 1450-1500°C, keeping it warm for 3-9h, then cooling naturally to room temperature, crushing to obtain mullite silicon carbide microporous aggregate.

[0028] The mullite silicon carbide microporous aggregate prepared in Example 3 is tested: the average pore diameter is 0.9~1.0 μm; the proportion of pores 3 The closed porosity is 14~18%; the compressive strength at room temperature is 130~145MPa; the thermal conductivity at 1000°C is 0.8~1.0W / (m•k).

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Abstract

The invention relates to mullite-carborundum microporous aggregates and a preparation method thereof. The technical scheme of the invention is as follows: the method comprises the steps: firstly, adding a pore former, which is 0.5wt% to 5.0wt% that of raw materials, into 45wt% to 70wt% of alumina raw material and 30wt% to 55wt% of crystalline silicon cutting waste liquid which serve as the raw materials, carrying out uniform mixing, carrying out compression molding at the pressure of 20MPa to 50MPa, carrying out natural drying, and carrying out baking for 12 to 24 hours at the temperature of 60 DEG C to 110 DEG C; then, heating the baked product to the temperature of 1,350 DEG C to 1,550 DEG C, carrying out heat preservation for 1 to 12 hours, then, naturally cooling the baked product to room temperature, and carrying out crushing, thereby preparing the mullite-carborundum microporous aggregates. The crystalline silicon cutting waste liquid contains the chemical ingredients, i.e., SiC, Si and C, wherein the content of SiC is not lower than 35wt%, the content of Si is not lower than 15wt%, and the content of C is not lower than 4wt%; the content of Al2O3 in the alumina raw material is not lower than 60wt%; the grain size of the alumina raw material is smaller than 0.074mm. The mullite-carborundum microporous aggregates and the preparation method thereof have the characteristics of low production cost, simple process, resource saving and environment protection; the prepared mullite-carborundum microporous aggregates are small in coefficient of thermal conductivity, high in strength, good in wear resistance and high in erosion capability.

Description

technical field [0001] The invention belongs to the technical field of microporous aggregate. In particular, it relates to a mullite silicon carbide microporous aggregate and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of high-temperature kilns and the urgent need for energy saving and emission reduction, it has become a trend for refractory materials for kiln working linings to develop towards low thermal conductivity, and the main method to achieve low thermal conductivity is to develop lightweight micro Hole aggregate. [0003] Alumina-based refractory materials have relatively excellent chemical stability and high-temperature performance, and are often used as working linings in ironmaking, cement and chemical industries and other high-energy industries. play a pivotal role. "A microporous lightweight bauxite refractory aggregate and its preparation method" (CN104177107A) patent technology, the technology use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/185C04B35/565C04B35/622C04B35/634
CPCC04B35/185C04B35/565C04B35/622C04B35/63488C04B38/067C04B38/068C04B2235/3217C04B2235/3826C04B2235/96C04B2235/9607C04B2235/9669C04B38/0054C04B38/0067C04B38/0074
Inventor 桑绍柏任博李亚伟徐义彪王庆虎
Owner WUHAN UNIV OF SCI & TECH
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