Method for preparing magnesium oxide by using magnesium sulfite

Abstract

The invention discloses a method for preparing magnesium oxide by using magnesium sulfite. The method comprises the following steps: drying a material in a hammer type dryer; dispersing magnesium sulfite hexahydrate and drying until the water content is 8-10%; cooling the magnesium sulfite powder at about 120 DEG C to 70-80 DEG C in a shell and tube cooler; after the cooling, removing dust in a multi-tube dust collector, and collecting the product to a round bin by a low-pressure pulse bag; feeding the product into a preheater at the tail of a firing kiln, and performing high-temperature calcination in a rotary kiln, wherein the calcination temperature is 750-900 DEG C, and the product is decomposed into solid magnesium oxide and SO2 gas; performing electric dust removal on the decomposedSO2, and feeding the SO2 into a purifying tower and then a sulfuric acid workshop to produce sulfuric acid; cooling the solid magnesium oxide by a cooling cylinder and packaging to obtain a finished product. According to the method disclosed by the invention, the drying and breaking effect is remarkably improved, the thermal efficiency is high, and the power consumption is reduced; meanwhile, reasonable technological parameters for drying the kiln, rotating the kiln, hanging kiln coating and the like are worked out for the rotary kiln for calcination, thus long-term stable and safe operation of the rotary kiln is guaranteed.

Description

technical field [0001] The invention relates to a method for producing magnesium oxide, in particular to a method for preparing magnesium oxide by using magnesium sulfite. Background technique [0002] Coal occupies an important position in my country's energy structure. For a long time to come, the coal-fired power generation industry will still occupy a considerable proportion. In thermal power plants, when coal is used as the main fuel for power generation, the flue gas discharged from the power plant boiler contains a large amount of S0 2 , soot and HCl, HF, S0 3 and other harmful gases, the pollution of the environment is very serious. In an environment where environmental protection is increasingly strengthened, magnesium oxide is used to desulfurize the flue gas discharged from thermal power plants, so that the technology that meets the emission standards has been widely used and developed in China. [0003] In recent years, magnesium oxide has been widely promoted...

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Problems solved by technology

[0004] However, the above documents only disclose the general device structure and process flow. In modern industrial production, the optimization of specific process parameters plays an important role in the equipment and process, which determines the production efficiency and energy consumption. Existing published literatures have insufficient research on specific process parameters

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