Treatment method for purifying sewage and tail gas from furnace gas in acid production from gypsum

Abstract

A treatment method for purifying sewage and tail gas from the furnace gas in the acid production from gypsum, belonging to the field of industrial sewage and waste gas treatment, is mainly divided into purification system acidic sewage circulation, sulfuric acid system acidic sewage treatment circulation and sulfuric acid system tail gas treatment circulation. The method uses the acidic sewage generated by the purification system acidic sewage circulation as the raw material of the sulfuric acid system acidic sewage treatment station, uses the solid generated by the sulfuric acid system acidic sewage treatment station as the raw material for the acid production from gypsum, and uses the alkaline sewage generated by the sulfuric acid system acidic sewage treatment circulation as the desulfurizer of the tail treatment step. The invention solves the treatment problem of the acidic sewage from the acid production from gypsum, realizes the cyclic utilization of the purification system washing acidic sewage, and reduces desulfurization cost through using the sewage after being subject to neutralizing treatment as the desulfurizer for the tail gas treatment.

Description

technical field [0001] The invention belongs to the field of industrial sewage and industrial waste gas treatment, and in particular relates to a treatment method for purifying sewage and tail gas from gypsum acid furnace gas. Background technique [0002] Compared with sulfuric acid produced by kiln gas produced by gypsum and pyrite boiling furnace gas, the composition of kiln gas and furnace gas is very different, and the harmful impurities are also very different, which determines the difference between gypsum acid and pyrite. The acid has different characteristics in the process: ①In the traditional pyrite acid production process, the furnace gas after the pyrite is roasted in a fluidized fluidized furnace enters the purification system, and the sewage after the purification of the furnace gas contains iron oxide, arsenic, fluorine and a small amount of For impurities such as heavy metals, the sewage is settled by an inclined plate and filtered through a CN filter, which...

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Problems solved by technology

[0004] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a package treatment method for purifying sewage and tail gas from gypsum acid furnace gas, so as to solve the problem that the acid sewage existing in the current gypsum acid furnace gas purification sewage and tail gas treatment methods cannot Problems such as closed-circuit recycling, high cost of desulfurization of sulfuric acid tail gas, and difficult disposal of by-products after desulfurization

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