Building method for abrasive bricks at end part of unloading chute of rotary hearth furnace

Abstract

The invention discloses a building method for abrasive bricks at the end part of an unloading chute of a rotary hearth furnace. According to the method, casting strips are reserved on the two sides ofa steel structured shell at the end part of the unloading chute; an abrasive brick building position is positioned between the reserved casting strips; wear resisting steel plates are welded on the two sides of the shell; tie pieces are welded on the inner sides of the wear resisting steel plates, and are connected with a steel plate at the bottom of the shell; anchoring nails are welded to gapsof the tie pieces in a crossed manner; in the abrasive brick building position, wear resisting stoppers are welded between adjacent abrasive bricks along the axis of the shell and welded at the positions, at the abrasive brick end faces, of the steel plate at the bottom of the shell, and the abrasive bricks are built; abrasive castable is cast in the reserved casting strips for compaction; and during casting, combined parts of the abrasive bricks and the reserved casting strips form slopes for supporting the abrasive bricks slightly projected. According to the method, the end part of the unloading chute is built as an organic whole, so that both wear and scouring are resisted, excellent heat stability is achieved, meanwhile, the overall stability of the structure is improved, the service life is prolonged, and the production operation of the rotary hearth furnace is guaranteed.

Description

technical field [0001] The invention relates to the technical field of repairing industrial furnaces and kilns, in particular to a method for building wear-resistant bricks at the end of a discharge chute of a rotary hearth furnace. Background technique [0002] Rotary hearth furnace is a new ironmaking process based on coal and hot air. It is a non-blast furnace ironmaking process developed in the past 40 years. The gradual development of rotary hearth furnace technology and its successful application have provided a channel for the treatment of solid waste in iron and steel plants, realized the recycling of resources in iron and steel enterprises, and reduced pollutant emissions. [0003] Rotary hearth furnace direct reduction technology is that iron ore powder (or laterite nickel ore, vanadium-titanium magnetite, sulfuric acid slag or metallurgical dust, dust ash, steelmaking and ironmaking sludge, etc.) The carbon-containing pellets are added into a rotary hearth furnac...

AI Technical Summary

Problems solved by technology

However, in the actual production process, it is difficult to truly exert the excellent performance of wear-resistant materials. The end of the discharge chute is prone to cracks and collapses. The material spiral is matched, which reduces the service life of the rotary hearth furnace feeding chute and seriously affects the production and operation of the rotary hearth furnace

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