High-concentration waste sulfuric acid treatment method and system

Abstract

The invention discloses a high-concentration waste sulfuric acid treatment method which comprises the following steps: (1) diluting high-concentration waste sulfuric acid, and carrying out primary heat exchange on the diluted waste sulfuric acid solution; (2) carrying out heat exchange again on the waste sulfuric acid solution obtained by the primary heat exchange for further cooling; (3) pretreating the waste sulfuric acid solution subjected to heat exchange again, and filtering to remove particle impurities to obtain a primary filtrate; carrying out primary nanofiltration on the primary filtrate, storing a primary clear solution obtained by filtering, carrying out washing filtration on a filtered primary concentrated solution by using a secondary nanofiltration membrane, and mixing a secondary clear solution obtained by washing filtration of the secondary nanofiltration membrane and the primary clear solution into a sulfuric acid clear solution for storage; filtering the sulfuric acid clear solution through a reverse osmosis membrane to obtain concentrated sulfuric acid, and filtering to obtain pure water; and (4) evaporating and concentrating the concentrated sulfuric acid. Theinvention discloses a high-concentration waste sulfuric acid treatment system. According to the method, the early sulfuric acid dilution amount is reduced, the later evaporation amount is reduced, andthe production energy consumption is reduced.

Description

Technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method and system for processing high-concentration waste sulfuric acid. Background technique [0002] In hydrometallurgy, a large amount of high-concentration waste sulfuric acid will be produced in metallurgical production processes such as leaching and electrolytic refining. High-concentration waste sulfuric acid contains different concentrations of inorganic acids, organics, and valuable metals. If these high-concentration waste sulfuric acid are directly discharged Not only will it cause environmental pollution, but also the valuable metals and sulfuric acid cannot be reasonably recovered. At present, the neutralization method is commonly used in the treatment of high-concentration sulfuric acid in the prior art. The disadvantage is that the neutralization method cannot effectively recover sulfuric acid and valuable metals, and there will be a large amount of waste resi...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a high-concentration waste sulfuric acid treatment method and system to solve the problem of low recovery rate in the prior art when high-concentration waste sulfuric acid is treated

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