Use of magnesium used refractory materials and method for preparing desulfurizing agent thereof

Abstract

The invention discloses an application of a magnesium used refractory and a method for preparing desulfurizing agents from the magnesium used refractory. The application of the magnesium used refractory is mainly characterized in that industrial waste magnesium used refractory is used as a flue gas desulfurizing agent. The preparation method comprises the following steps: (1) carrying out sorting, impurity removal, crushing and processing, magnetic separation for removing ferrum and multistage grinding on the decomposed magnesium used refractory to be prepared into powder; (2) acid washing and gravity floating; (3) drying and baking; (4) preparing slurry: preparing the obtained powder into slurry with the solid content between 10 percent and 30 percent and curing the slurry for 3-5 hours.The invention not only saves excellent magnesite sources, but also avoids energy consumption and environment pollution in the process of treating the waste magnesium used refractory and manufacturingthe prior magnesium oxide powder desulfurizing agent and greatly reduces the cost of the flue gas desulphurization process by a magnesium wet method.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, in particular to a method for preparing a desulfurizing agent in a desulfurization tower. Background technique [0002] Currently, my country's SO 2 The total emissions have exceeded 20 million tons for many years, ranking first in the world. The flue gas desulfurization process has been widely used in the purification of industrial flue gas. Generally, the alkaline absorption liquid is used to contact the flue gas to make the flue dust and SOx in the flue gas 2 Enter the absorption liquid together to purify the flue gas. Common processes include limestone / lime-gypsum method, discarding method, sodium washing method, double alkali method, magnesium oxide method, flue gas circulating fluidized bed method, activated carbon method, ammonia method, Spray drying method and calcium spraying in the furnace plus tail humidification activation method, etc. Among them, the limestone-gyp...

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Problems solved by technology

Among them, the limestone-gypsum method is the mainstream process for flue gas desulfurization [CN2629812Y]. Although it has the advantages of high desulfurization efficiency, good adaptability to flue gas, mature process route, and cheap and easy-to-obtain desulfurizer, it still faces the following problems: ①CaCO 3 , CaSO 3 and CaSO 4 The solubility is low, and fouling, blockage and wear are prone to occur during system operation; ②The use value of the by-product gypsum is low, and the market sales prospect is not optimistic, especially in places where the by-product natural gypsum is accumulated in large quantities, causing environmental pollution;③ The equipment occupies a large area, the system management operation is complicated, and the investment and operation costs are high; ④The amount of circulating water is large, and the desulfurization wastewater is difficult to treat; ⑤The calcium method produces equimolar CO while desulfurization 2 , exacerbating the greenhouse effect

This not only wastes resources, but also pollutes the environment