Preparation method of silicon carbide wear-resistant fireproof wind-guiding wall crossbeam and wind-guiding wall brick

Abstract

The invention relates to a crossbeam for supporting a wind-guiding wall in a sintering and pelletizing mechanical shaft furnace and the wind-guiding wall, specifically to a preparation method of the silicon carbide wear-resistant fireproof wind-guiding wall crossbeam and a wind-guiding wall brick. The preparation method comprises steps of burdening, raw material premixing, secondary mixing, moulding and sintering. Main materials contain waste high-voltage electric porcelain, fused brown corundum, SiC and silicon dioxide. Phosphate is used as a binder; sodium tripolyphosphate or sodium hexametaphosphate is used as a deflocculant; oxalic acid or citric acid is used as a delayed coagulant; and silicon metal powder is used as an anti-oxidant. Each performance of the prepared wind-guiding wall crossbeam is better than that of a large water beam prepared from a seamless steel pipe. Compressive strength of the wind-guiding wall brick within the 1100-1400 DGE C operating temperature range is greater than 60 Mpa, apparent porosity is less than 15%, wear-resistance value is less than 5 cm<3>, and thermal shock resistance by water-cooling test is greater than 20 times. According to the invention, the problem that service life of present crossbeams prepared from seamless steel pipes and clay-combined wind-guiding wall bricks is short is solved.

Description

technical field [0001] The invention relates to a girder supporting an air-guiding wall and an air-guiding wall in a sintering pellet machine shaft furnace, in particular to a method for preparing a silicon carbide wear-resistant refractory air-guiding wall girder and an air-guiding wall brick. Background technique [0002] At present, the raw material pellets used in smelting blast furnaces are all produced by mechanical shaft furnaces. In the existing mechanical shaft furnace, the girder supporting the wind-guiding wall (also known as the large water beam) is made of a cooling water circulation pipe welded with seamless steel pipes and a connecting steel plate. both ends of the wall. [0003] The wind guide wall and the supporting beam in the shaft furnace, when the large particles of dust and pellet slag entrained by the air flow pass through the ventilation holes, due to their large particle size and high quality, they cannot be The air flow is brought out from the air...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of poor high-temperature load capacity of large water beams made of existing seamless steel pipes, and short service life of clay-bonded wind-guiding wall bricks, and provides a new type that can improve mechanical properties, oxidation resistance, wear resistance, and acid resistance. Alkali resistance, thermal shock resistance, silicon carbide wear-resistant fire-resistant air guide wall straight type and upper arched lower flat beam and air guide wall bricks for prolonging the service life of the girder and the air guide wall.