1) Lead-zinc airtight blast furnace
Lead-zinc airtight blast furnace is a special blast furnace that smelts two metals lead and zinc at the same time in one device. Its characteristics are that 800-850 ℃ hot air is used for blasting; the top of the furnace is kept at a high temperature of 1050-1100 ℃; The hearth of the lead-zinc airtight blast furnace is built with magnesia bricks, the hearth is a water jacket, the furnace body is built with high-alumina bricks, and the top of the furnace is knotted with high-alumina unshaped refractory materials. The front beds of lead-zinc airtight blast furnaces are all electric heating front beds, and their service life is lower than that of blast furnaces. Mainly due to slag erosion and scouring slag lines. At present, two lead-zinc airtight blast furnaces in China are lined with chrome slag bricks and aluminum-chromium-titanium bricks respectively. Although the furnace age can reach more than 1 year, it is still lower than the life of lead-zinc airtight blast furnaces. How to further improve the furnace life of the electric heating front bed to match the life of the lead-zinc airtight blast furnace is the key to improving the operation rate of the lead-zinc airtight blast furnace.
2) Oxygen bottom blowing lead furnace
The development of oxygen bottom blowing smelting technology started from the transformation of lead smelting process, and it was first applied in crude lead smelting. At present, domestic lead smelting enterprises have adopted oxygen bottom blowing smelting technology in large numbers, and there are more than a dozen oxygen bottom blowing smelting technology. The lead furnace was put into production. The research on refractory materials for oxygen bottom blowing smelting furnace has a good start. Further improvement of refractory materials and improving furnace life are important conditions for the development of oxygen bottom blowing smelting technology.
3) Zinc concentrate fluidized roaster
Zinc concentrate fluidized roasting furnace (boiling furnace) is an indispensable thermal equipment for the treatment of zinc concentrate by hydro-zinc smelting and distillation. Circular furnaces, circular-stage expansion furnaces, and square furnaces are all made of clay bricks, and the distribution plate of the furnace bottom, the feeding front chamber, and the discharge port are also rammed with clay-based refractory concrete. The development direction of chemical roasting furnace is large-scale, and the other development direction should be the use of amorphous refractory materials.