A high-temperature cyclone melting type chromium slag detoxification device and its detoxification method

Abstract

A high-temperature cyclone melting chromium slag detoxification device, including a cyclone melting furnace body, a cyclone separator, a cooling pool, used to transport chromium slag and SiO-containing 2 The feeding bin of the additive and the coal powder bunker used to transport the pulverized coal, the top of the cyclone melting furnace body is provided with a primary air inlet and a burner, and the cyclone melting furnace body is also provided with a secondary air inlet; The lower end of the melting furnace body is connected with a slag discharge pipe, and the burned slag in the cyclone melting furnace body is discharged into the cooling pool through the slag discharge pipe; the upper end of the cyclone separator is connected with a bag filter through the flue, and the bag filter is also passed through the induced draft fan. It is connected with a chimney, and a superheater, an economizer and an air preheater are sequentially arranged in the flue. The additive of the present invention is selected to contain SiO 2 Additives, especially sand and quartz sand, can significantly increase the melting point of chromium slag and coal fly ash, thereby promoting Cr 6+ Complete reduction in the high-temperature zone avoids the melting of chromium slag and coal powder in the low-temperature zone, resulting in incomplete detoxification.

Description

technical field [0001] The invention relates to the field of harmless treatment and resource utilization of industrial hazardous waste, in particular to a high-temperature cyclone melting chromium slag detoxification device and a detoxification method thereof. Background technique [0002] Chromium slag mainly comes from the toxic waste residue produced in the production process of chromium and chromium salts. The properties of chromium slag vary with the raw materials and chromium salt production process. According to the national hazardous waste list, chromium slag is listed as hazardous solid waste. At present, the total production of chromium slag in the country is about 6.3 million tons, of which 3.2 million tons have not been detoxified. The disorderly accumulation of these chromium slags has caused serious pollution of surface water, groundwater and soil environment. Cr(VI) has high fluidity and strong toxicity, and has carcinogenic effect on organisms. Cr(Ⅲ) has low...

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Problems solved by technology

But there are also some defects, such as high investment and operating costs of biomass fluidized bed, relatively low combustion efficiency and other shortcomings, which limit the large-scale application of biomass fluidized bed, which in turn affects the inability to process large-scale chromium slag. question

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