Waste acid cyclic regeneration on-line recovery treatment system and process

Abstract

The invention relates to a waste acid cyclic regeneration on-line recovery processing system and technology, and belongs to the technical field of waste acid regeneration, the waste acid cyclic regeneration on-line recovery processing system comprises a waste acid regeneration system, a drain outlet of the waste acid regeneration system is connected with a feed inlet of a drying system, and a discharge outlet of the drying system is connected with a sorting sintering system; a gas outlet of the drying system is connected with a feeding hole of the waste acid regeneration system; the method has the beneficial effects that the process flow is short, the technology is advanced, the energy consumption is low, the online treatment of the sludge is realized, the secondary pollution caused by the links of sludge collection, storage, transportation and the like is avoided, and the full-quantization and resource clean utilization of the sludge is realized.

Description

technical field [0001] The invention relates to the technical field of waste acid regeneration, in particular to an on-line recycling and processing system and process for waste acid recycling and regeneration. Background technique [0002] In order to make the surface of the steel strip smooth and clean, the steel strip is pickled and removed with hydrochloric acid before cold rolling, and the waste pickling solution is formed after the pickling and removal of impurities. The waste pickling solution is regenerated to produce new hydrochloric acid for reuse. During the regeneration process, it is necessary to remove impurities from the waste acid solution. The sludge produced by the removal of impurities is difficult to transport due to its high water content and high chlorine content, which is easy to corrode the treatment process equipment. [0003] Therefore, the following methods are usually adopted at present: first, landfill disposal, and landfill disposal of water-co...

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Problems solved by technology

Third, use wet separation process, after wet separation process, the solid is used as cement raw material, and the liquid undergoes chemical reaction, flocculation precipitation, evaporation, crystallization, and drying to obtain KCl, and the precipitated impurities are used as cement raw material, but the wet The separation process is complex, the disposal cost is high, and secondary pollution is easy to occur

Fourth, high-temperature roasting, through high-temperature roasting, the chlorine-containing substances in the sludge are decomposed to form hydrochloric acid, the process is complicated, the energy consumption is high, and the sludge is easy to cause the blockage of the roasting tower

[0004] Therefore, the existing methods for treating the water-containing sludge produced by waste acid treatment are complicated in process, high in cost, easy to corrode equipment, easy to generate pollution, and cannot effectively utilize resources

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