Treating method for vanadium slag roasting tail gas

Abstract

The invention belongs to the field of production of vanadium pentoxide, and particularly relates to a treating method for tail gas produced after vanadium slat is roasted through a rotary kiln. The method comprises the following steps that a, vanadium slag roasting tail gas enters a dust removal system and is separated to obtain vanadate and tail gas I, wherein the vanadate is transferred into a pulping groove; b, the tail gas I enters a waste heat boiler system and exchanges heat with process water supplied externally to be cooled, tail gas II is obtained, and the process water is changed into saturated vapor to be supplied externally; c, the tail gas II enters a Venturi system to be cooled further, and tail gas III is obtained; d, the tail gas III enters a desulfurizing tower from the bottom and makes countercurrent contact with alkali liquor sprayed on the top, defogging is carried out, up-to-standard emission is carried out, and the alkali liquor enters a sewage treating system. By means of the method, the vanadium pentoxide rotary kiln roasting tail gas waste heat utilization rate can be improved, sulfide in the roasting gas can be discharged on standard completely, and therefore a new technological process of clean production of a vanadium pentoxide roasting tail gas system is achieved.

Description

technical field [0001] The invention belongs to the field of vanadium pentoxide production, and in particular relates to a method for treating tail gas produced by vanadium slag roasting in a rotary kiln during the production process of vanadium pentoxide. Background technique [0002] Vanadium pentoxide is widely used in metallurgy, chemical industry and other industries, mainly for smelting ferrovanadium. It is used as an alloy additive, accounting for more than 80% of the total consumption of vanadium pentoxide, followed by a catalyst for organic chemical industry, that is, a catalyst, accounting for about 10% of the total. In addition, it is used as an inorganic chemical, chemical reagent, enamel and Magnetic materials, etc. account for about 10% of the total. A prominent problem in the current production process of vanadium pentoxide is environmental protection and energy saving. [0003] At present, the production of vanadium pentoxide generally uses vanadium slag as...

AI Technical Summary

Problems solved by technology

The problems with this traditional method are that firstly, the waste heat of the exhaust gas is not utilized, and secondly, that it is sometimes difficult to meet the emission standards. Even if the standards are met, the indicators are still close to the upper limit

[0008] To sum up, in the prior art, there are problems that the waste heat of the rotary kiln roasting tail gas is not utilized or the waste heat utilization efficiency is low, and the sulfides in the tail gas are difficult to control, and the tail gas often cannot meet the standard.

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