An environmentally friendly process for purifying tail gas from potassium sulfate production

Abstract

The invention proposes an environmentally friendly process for purifying the tail gas produced by potassium sulfate. The tail gas is treated through tail gas treatment equipment. The tail gas treatment equipment includes a tail gas transportation pipeline, a graphite cooler, a primary scrubber group, a secondary scrubber group, and a primary absorption tower group. , secondary absorption tower group, gas-liquid separator, acid making bucket, hydrochloric acid intermediate tank and water circulation cooling assembly. The process flow of the environmentally friendly process includes tail gas cooling, B acid production, A acid production, dilute hydrochloric acid production and cooling water circulation. The present invention In view of the problems existing in the existing tail gas treatment, development and improvement can be carried out to produce multi-specification hydrochloric acid. The hydrochloric acid yield rate is high, the grade is high, the quality is good, and the market is good. The hydrogen chloride tail gas treated by the present invention has a high absorption rate and meets the emission requirements. The combination of process water and circulating water saves the enterprise's water, which meets the enterprise's low-cost and high-efficiency production requirements, and also meets the environmental protection requirements of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of potassium sulfate production, in particular to an environment-friendly process for purifying tail gas from potassium sulfate production. Background technique [0002] Potassium sulfate refers to an important chlorine-free potassium fertilizer containing sulfur and potassium elements, which can be used in many fields and has a wide market demand. [0003] At present, most of the production methods of potassium sulfate are the Mannheim method. In the process of producing potassium sulfate, a large amount of hydrogen chloride tail gas will be produced, which can be used as the raw material for the production of by-product hydrochloric acid. The existing potassium sulfate production enterprises have relatively poor supporting treatment equipment, and only provide preliminary cooling and washing of hydrogen chloride tail gas. The hydrochloric acid produced is of poor quality and poor marketability. Moreover, t...

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Problems solved by technology

The existing potassium sulfate production enterprises have relatively poor supporting treatment equipment, and only provide preliminary cooling and washing of hydrogen chloride tail gas. The hydrochloric acid produced is of poor quality and poor marketability. Moreover, the tail gas treatment is incomplete and does not meet the discharge requirements, and additional processing is required. Purification, which not only increases the processing cost, but also the by-product is low profit

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