The raw material, proportioning ratio and production process for water free stopping mix for blast furnace tapping hole are described. At present under the condition of high capacity of blast furnace,the stopping mix for blast furnace tapping hole is developed in the directions of high strength, high corrosion resistance, long service life and environmental protection. Emphasis should be given to improve the structure and properties of the stopping mix for blast furnace tapping hole to produce a high quality stopping mix.

Through the modifications of process equipment, such as the kiln proper, proportioning system, air supply system and discharge system etc. of the unused mechanical vertical cement kiln, the cement kiln is made to meet the requirement of lime calcination process. The qualified lime is produced with the comprehensive utilization of limestone tailings with grain size from 10mm to 20mm.

In order to eliminate the dangerous factors which may occur during the lime production of rotary kiln and avoid accident occurring, a deeper analysis is given to the hidden danger of safety existing in the various links of production and specific safety measures are put forward at the same time.

The key points, such as process flow, gunning process and corresponding parameters for kiln lining gunning repair technology of No.1 250m3 mechanical shaft kiln of Xintong Kiln Lining Material Co.，Ltd. of Xiangsteel, Hunan and the subsequent kiln heating-up schedule etc. are described. After the gunning repair of the kiln lining, the kiln has operated stably for one year. Up to now, no spalling phenomenon of gunned material occurs.

By using electro-fused magnesia as raw material, the effects of adding amounts and modes of α-Al₂O₃ and Cr₂O₃ on the creep resistance of magnesian material under high temperature are studied.And on the basis of this, the effects of additions of different types of Al₂O₃ on the creep resistance of magnesian material under high temperature are studied with addition of 3% Cr₂O₃. The result shows that with the increase of addition amount of Al₂O₃ the creep resistance of magnesian material under high temperature has increased. The creep resistance of the magnesian material with addition of 3% Cr₂O₃ is better than that of the low creep resistance high alumina bricks used on hot blast stove.