Process and system for producing fused magnesite by taking magnesium hydroxide as raw material

Abstract

The invention relates to a process and a system for producing fused magnesite by taking magnesium hydroxide as a raw material. The system comprises a filter cake storage bin, a box type feeder, a hammer type crushing dryer, a suspension roasting device, a high-temperature and high-pressure ball pressing system, a bucket elevator, an electric furnace feeding bin and an electric furnace smelting system. The method comprises the following steps: preparing a magnesium hydroxide filter cake from seawater or brine; feeding into the hammer type crushing drier through the box type feeder for crushingand drying; conveying obtained crushed and dried magnesium hydroxide powder into the suspension roasting device together with dry air to be preheated and roasted, conveying obtained magnesium oxide into the high-temperature and high-pressure ball pressing system to be subjected to circulating hot pressing, conveying obtained magnesium oxide balls into the electric furnace feeding bin through the bucket elevator for storing and then feeding into the electric furnace smelting system to be smelted, so that the fused magnesite product is prepared. The method is short in technological process, lowin production cost, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of magnesia material production, in particular to a process and system for producing fused magnesia by using magnesium hydroxide as a raw material. Background technique [0002] Sintering and electric melting are two main processes for preparing magnesia. Among them, the sintering process uses natural gas, heavy oil, etc. Electric energy smelts magnesia raw materials to over 3000°C in an electric arc furnace to produce fused magnesia products. The main crystal phase of periclase in fused magnesia products is coarser and denser in structure, and can remain stable above 2300 ° C. Its high temperature strength, slag resistance, erosion resistance and hydration resistance are all better than sintered magnesium The sand is superior, and the large crystal magnesia product also has special optical properties. In addition to being used as high-quality refractory raw materials in metallurgy, building materials, gla...

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Problems solved by technology

The existing technology of preparing magnesia with magnesium hydroxide as raw material is mainly sintering process, and the process is long and the production cost is high. There are few related domestic production enterprises

[0004] In recent years, the requirements for the treatment of flue gas from kilns have gradually increased. In addition to dust, sulfur dioxide and nitrogen oxides also need to be treated, especially in high-temperature kilns using sintering technology. production cost of the enterprise

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