Modified Magnesium Aluminum Chrome Brick

Along with the progress of the zinc smelting process, the zinc concentrate fluidized bed roasting, dilute sulphuric acid dissolves, still contain a lot of zinc, Pn, Ln, Ce and other valuable metals, in the form of oxide exist in acid leaching residue.Many manufacturers have been equipped with rotary evaporative kiln (known as zinc-smelting rotary kiln, or rotary kiln).Its working principle is to mix acid leaching residue and coke into rotary kiln, 1300 ℃ to 1350 ℃ heating distilling, made from compound reduction and metal zinc vaporization and condensation.Acid penetration and coke mix, high volatile temperature, working conditions are harsh.The kiln lining is subjected to the intense erosion of high temperature melting slag, the heat shock of the kiln body rotation, and at the same time, it has a reduction reaction at high temperature, which is the reaction of the reduction atmosphere, resulting in the peeling and destruction of kiln lining refractory materials.The rapid destruction of rotary kiln lining seriously restricts the normal production and economic benefit of enterprises.

My company's technology department after repeated and zinc smelting unit of technical personnel exchanges, communication and understanding, and summarize magnesium aluminate spinel brick in rotary kiln cement successful use of the experience, chose  magnesium stone (MgO) as the main crystal phase, the introduction of magnesium aluminum spinel and chrome ore, make the products within magnesium aluminium chromium compound spinel, enhance and improve products snap heat and cold resistance and molten slag erosion resistance, so as to achieve a long service life.

The modified magnesium-alumina brick has excellent resistance to slag, chemical erosion resistance, iron oxide, alkaline slag and other solvents.The anti-stripping, erosion resistance, high temperature toughness and high strength;Thermal shock resistance and low thermal conductivity;Reduce chromium pollution.The comprehensive characteristics of magnesia - spinel brick and magnesium-chrome brick are fully utilized.Moreover, the kiln material is strengthened in the adhesion of the brick, which is conducive to the sticking of the kiln skin.It is mainly used in high temperature and large dry cement rotary kiln of zinc smelting and volatile rotary kiln.

In order to reduce the temperature of rotary kiln tube, reduce heat loss, energy saving and environmental protection.The company developed the modified magnesium aluminum chromium composite brick.The working layer is high temperature of magnesium aluminum chromium.The cylinder is insulated to prevent the temperature of kiln from being distributed to the kiln.Now this brick is in promotion use.