Rotary kilneye castable for treating industrial minerals and preparation method of castable

A rotary kiln and castable technology, which is applied in the field of rotary kiln mouth castables for processing industrial minerals and its preparation, can solve the problems of poor corrosion resistance of refractory materials, difficult production needs of rotary kilns, poor thermal shock stability, etc., to achieve Good corrosion resistance, good thermal shock stability, and the effect of solving wear

Inactive Publication Date: 2013-04-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the local overheating during the roasting process and the long-term operation, the kiln lining refractories are subject to double erosion, wear, mechanical stress and thermal shock of calcined minerals and additives, resulting in poor corrosion resistance, poor thermal shock stability, and structural problems. Severe circles and reduced lifespan
[0003] Therefore, the requirements for refractory materials for rotary kilns ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A rotary kiln pouring material for processing industrial minerals and a preparation method thereof. With 40~50wt% brown corundum particles, 20~25wt% mullite particles, 15~20wt% white corundum fine powder, 5~10wt% silicon carbide fine powder, 1~5wt% silicon oxide fine powder, 1 ~8wt% active α-alumina micropowder and 2~8wt% CA-70 aluminate cement, plus 4~8wt% water and 0.1~0.2wt% sodium tripolyphosphate of the above mixture, stir evenly, pour Vibration molding. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 to 48 hours to obtain a rotary kiln castable for industrial mineral processing.

[0020] The castable for the rotary kiln mouth prepared in this example for processing industrial minerals has been inspected: the apparent porosity is 15-17%, and the bulk density is 2.85-3.15 g / cm 3 , the flexural strength is 8~12MPa; after baking at 1000℃, the flexural strength is 12~20MPa, and the wear amount is less than 2%.

Embodiment 2

[0022] A rotary kiln pouring material for processing industrial minerals and a preparation method thereof. First, 40~50wt% brown corundum, 25~30wt% mullite particles, 6~15wt% white corundum fine powder, 10~15wt% silicon carbide fine powder, 1~5wt% silicon oxide fine powder, 1 ~8wt% active α-alumina micropowder and 2~8wt% CA-70 aluminate cement are used as raw materials, then add 4~8wt% water and 0.1~0.2wt% sodium hexametaphosphate, and mix well , pouring vibration molding. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 to 48 hours to obtain a rotary kiln castable for industrial mineral processing.

[0023] The rotary kiln mouth castable for processing industrial minerals prepared in this example is inspected: the apparent porosity is 15-17%, and the bulk density is 2.85-3.15g / cm 3 , the flexural strength is 8~12MPa; after baking at 1000℃, the flexural strength reaches 12~20MPa, and the wear amount is less than 2%.

Embodiment 3

[0025] A rotary kiln pouring material for processing industrial minerals and a preparation method thereof. First, 40~50wt% brown corundum, 30~35wt% mullite particles, 6~15wt% white corundum fine powder, 10~15wt% silicon carbide fine powder, 1~5wt% silicon oxide fine powder, 1 ~8wt% of activated α-alumina micropowder and 2~8wt% of CA-70 aluminate cement as raw materials, plus 4~8wt% of water and 0.1~0.2wt% of polyethylene glycol polycondensate , Stir evenly, pour and vibrate to form. The molded green body is naturally dried in the air for 24 hours, and then dried at 110°C for 24 to 48 hours to obtain a rotary kiln castable for industrial mineral processing.

[0026] The castable for the rotary kiln mouth prepared in this example for processing industrial minerals has been inspected: the apparent porosity is 15-17%, and the bulk density is 2.80-3.12 g / cm 3 , the flexural strength is 8~12MPa; after baking at 1000℃, the flexural strength reaches 12~20MPa, and the wear amount i...

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Abstract

The invention relates in particular to a rotary kilneye castable for treating industrial minerals and a preparation method of the castable. The preparation method adopts the technical scheme that the preparation method comprises the steps that 40-60wt% of brown corundum particles or alumina particles, 20-40wt% of mullite particles, 6-20wt% of white corundum fine powder, 5-15wt% of silicon carbide fine powder, 1-5wt% of silicon oxide micro powder, 1-8wt% of activated alpha aluminium oxide micro powder and 2-8wt% of aluminate cement are taken as raw materials; 4-8wt% of water and 0.1-0.4 wt% of water reducing agent are added to the raw materials and mixed uniformly; casting and vibration molding is conducted; and a molded blank is naturally dried for 24h in air, and then dried for 24-48h at 110 DEG C. The rotary kilneye castable for treating the industrial minerals mainly comprises Al2O3 and SiC, has main crystalline phases of corundum, silicon carbide and mullite, has higher strength, and has the characteristics of good erosion resistance, thermal shock stability and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of castables for rotary kilns. In particular, it relates to a casting material for a rotary kiln mouth for processing industrial minerals and a preparation method thereof. Background technique [0002] Rotary kiln is an important type of thermal equipment, which is widely used in the production or treatment of cement, lime, industrial minerals and industrial waste. Traditionally, the working lining of the rotary kiln mouth is built with refractory bricks, but bricks are easy to fall off and the cement kiln is easily deformed after long-term operation, which makes bricklaying and maintenance difficult. Therefore, in the past two decades, castables have been gradually applied at the kiln mouth of the rotary kiln, which effectively solved the problem of cylinder deformation and achieved good results. But in addition to the cement industry, there are a large number of rotary kilns for other purposes, such as s...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 韩兵强孔建益鄢文王兴东邹光明陈俊峰魏耀武李楠
Owner WUHAN UNIV OF SCI & TECH
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