Coating for oxygen lance of nonferrous smelting furnace

Abstract

The invention discloses a coating for an oxygen lance of a nonferrous smelting furnace. The coating for the oxygen lance of the nonferrous smelting furnace consists of the following raw materials in percentage by weight: 5 to 15 percent of 3 to 5mm waste alumina-chrome bricks, 5 to 15 percent of 1 to 3mm waste alumina-chrome bricks, 5 to 15 percent of 3 to 5mm tabular corundum, 5 to 15 percent of 1 to 3mm tabular corundum, 40 to 50 percent of tabular corundum of less than 0.088mm, 8 to 15 percent of chromium oxide green of less than 0.044mm, 3 to 8 percent of pure calcium aluminate cement, 2.5 to 5 percent of alpha-Al2O3 micropowder of less than 0.044mm and 8 to 10 percent of bonding agent. The coating is small in thermal expansion coefficient difference and high in erosion scouring resistance and thermal shock stability, and the current situations of high oxidation rate and high erosion speed of the oxygen lance can be remarkably improved, so that the service life of the oxygen lance is greatly prolonged, and the comprehensive cost of the oxygen lance is lowered.

Description

technical field [0001] The invention belongs to the field of inorganic non-metal refractory materials, and in particular relates to a smear material for an oxygen blowing pipe of a nonferrous smelting furnace. Background technique [0002] Oxygen blowing pipes are widely used in the fields of steelmaking oxygen blowing furnace cleaning, steel ladle blowing oxygen blowing to start pouring, ironmaking blast furnace oxygen blowing to open iron taps, etc. In order to prolong the life of oxygen blowing pipes, the common practice at home and abroad is to The surface of the oxygen steel pipe is coated with refractory material to achieve the purpose of reducing labor intensity and reducing steel consumption per ton. However, most of these coatings use silicate or magnesium oxide substances. The oxygen blowing tube coated with these substances can play a certain role, but there are generally three problems: one is that low-temperature baking is required after molding , which not onl...

AI Technical Summary

Problems solved by technology

However, most of these coatings use silicate or magnesium oxide substances. The oxygen blowing tube coated with these substances can play a certain role, but there are generally three problems: one is that low-temperature baking is required after molding , which not only has high cost, but also prolongs the production cycle; the second is that the thermal expansion of the coating does not match the metal at high temperature, and the strength and wear resistance are not enough, resulting in a short service life; the third is that the oxygen blowing pipe needs to be derusted before coating Waiting for processing, time-consuming and labor-intensive

[0003] At present, the short service life of the oxygen blowing tube used in the reverberatory furnace in the non-ferrous industry is a problem that plagues various non-ferrous smelting manufacturers

Domestic non-ferrous smelting manufacturers mostly crush the used high-alumina bricks and grind them into powder, then mix them with water glass and then smear them. Although the life of the oxygen blowing tube can be extended to a certain extent, it is still not ideal.

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