Method for circulative and comprehensive utilization of waste acids generated in acid preparation process through smoke smelting

Abstract

The invention relates to a method for circulative and comprehensive utilization of waste acids generated in the acid preparation process through smoke smelting, and belongs to the technical fields of acid preparation through acid smelting, copper concentrate flotation from cyaniding tailings, and liquid purification of a sulfur concentrate flotation system. According to the invention, the circulative and comprehensive utilization of the waste acids generated in the acid preparation process through the smoke smelting is formed through mixing the waste acids with the cyaniding tailings to control the suitable pH value for floating copper concentrate, floating sulfur concentrate and returning a floatation system liquid to the acid preparation process through the smoke smelting. The method completely combines the comprehensive utilization of the waste acids output in the production of sulfuric acid with the comprehensive recovery technology of a plurality of elements from the cyaniding tailings, and effectively solves technical problems comprising the difficult treatment and difficult comprehensive recovery of the waste acids. The whole process flow of the method is basically circulated in a closed manner through a full wet method, so the circulative and comprehensive utilization efficiency of the waste acids is substantially improved, the zero discharge of wastewater is realized, and the pollution to the surrounding environment is reduced, thereby the economic benefits of enterprises are improved.

Description

technical field [0001] The invention relates to a method for recycling and comprehensive utilization of waste acid produced in the process of producing acid from smelting flue gas, and belongs to the technical field of liquid purification treatment in flotation system of copper concentrate and sulfur concentrate flotation by smelting flue gas and cyanide tailings. Background technique [0002] In recent years, in the smelting flue gas acid production industry, sulfur-containing minerals and oxygen in the air are roasted at a certain temperature. The high-temperature flue gas has undergone dry dust removal, electrostatic dust removal, and wet purification to remove impurities that affect the production of sulfuric acid. Wet purification is to fully mix water, dilute acid and mixed flue gas for purification. The acidic wastewater generated during the purification process is usually identified as waste acid. Since the sulfuric acid content of such waste acid is not high, it is u...

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Problems solved by technology

[0002] In recent years, in the smelting flue gas acid production industry, sulfur-containing minerals and oxygen in the air are roasted at a certain temperature. The high-temperature flue gas has undergone dry dust removal, electrostatic dust removal, and wet purification to remove impurities that affect the production of sulfuric acid. Wet purification is to fully mix water, dilute acid and mixed flue gas for purification. The acidic wastewater generated during the purification process is usually identified as waste acid. Since the sulfuric acid content of such waste acid is not high, it is usually carried out by lime neutralization method. The treatment not only causes the waste of waste acid and high treatment cost, but also the calcium sulfate neutralized slag produced by the treatment is difficult to be used as raw materials for building materials and can only be stockpiled, occupying a large amount of land, and causing serious damage to the surrounding environment. With the national construction of a conservation-oriented society and an environment-friendly society, the production of waste acid seriously restricts the sustainable development of the smelting flue gas acid production and sulfuric acid production industries. Therefore, comprehensive utilization of waste acid, reduction of effluent and waste The research and application in the direction of processing and processing costs are quite important, but in this field, there is no method to solve this problem

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