Rotary hearth furnace hearth structure

Abstract

The invention discloses a rotary hearth furnace hearth structure. The rotary hearth furnace hearth structure which is a multilayer structure sequentially comprises, top to down, a carbon composite material layer which contains 8-45% of graphite and 92-54% of fused magnesia magnesium oxide, a carbon composite material layer which contains 8-45% of graphite and 92-54% of fused magnesia magnesium oxide, a mullite firebrick layer, a high-alumina brick layer, and a light-weight thermal-insulation brick layer. So the comprehensive hearth has a special slag erosion resistance and a metal and liquid slag adhesion resistance, and the dimension stability problem of expend with heat and contract with cold of the hearth is solved.

Description

technical field [0001] The invention relates to a refractory masonry technology at the bottom of a rotary hearth furnace, in particular to a bottom structure of a rotary hearth furnace. Background technique [0002] At present, in the field of direct reduction of iron and steel plant dust, lateritic nickel ore, vanadium-titanium magnetite and refractory iron ore, and the most advanced third-generation ironmaking technology (granulated iron), its core technology equipment is a large-scale The rotary hearth furnace has an annular rotary hearth in the furnace, and the metallurgical process of high-temperature rapid reduction of materials is completed on this rotary hearth. [0003] For large-scale industrial rotary hearth furnaces with an annual output of 20, 50, and 800,000 tons, the pursuit of high operating rate is very important for stable production, stable process and good economic benefits. In actual production, it is found that the life of the bottom of the furnace is n...

AI Technical Summary

Problems solved by technology

[0007] (2) As time goes on, the continuously growing hearth forms a very hard plate composed of furnace charge and magnesia. This plate strongly rubs against the discharge screw blade, which reduces the life of the blade, and even causes the discharge screw to stop due to overload.

[0009] (4) Under the condition of high temperature above 1400 ℃, the refractory bricks at the bottom of the furnace expand severely, causing the hearth to bulge, and the corner bricks of the rotary hearth furnace are pushed out by the hearth bricks and fall off

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