Denitration catalyst regeneration waste liquid recycling process

Abstract

The invention relates to the technical field of waste liquid treatment, in particular to a denitration catalyst regeneration waste liquid recycling process which comprises the steps of waste liquid preheating, flocculation removal, adsorption precipitation and solid-liquid regeneration. The circulator comprises a liquid tank, a tank rack and a controller; a pair of semicircular tank covers is arranged at the top end of the liquid tank, and a filter screen is arranged in each tank cover; when the solid suspended matters in the regenerated waste liquid are removed, the regenerated waste liquid is doped in the solid suspended matters so that the removed solid suspended matters become pollution sources, and the cyclic utilization effect of the regenerated waste liquid is reduced; therefore, the tank cover is arranged in the liquid tank, regenerated waste liquid mixed with flocculate is drained through the filter screen on the tank cover, secondary pollution caused by regenerated waste liquid in the liquid tank is avoided, the state of the regenerated waste liquid in the liquid tank is fed back through the monitor, and mixing of silicate slag particles and the regenerated waste liquid in the liquid tank is ensured in cooperation with the adjusting effect of the controller so that the application effect of the regenerated waste liquid recycling process of the denitration catalyst isimproved.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a regeneration waste liquid recycling process of a denitrification catalyst. Background technique [0002] The denitrification catalyst is widely used in the denitrification treatment of nitrogen oxides in industrial production. After a period of use, the sintering of the denitrification catalyst in a high temperature environment, the blockage of the carrier pores and the poisoning of metal elements in it reduce the activity of the denitrification catalyst. The active state of the denitrification catalyst can be recovered by cleaning the regeneration liquid, and the impurities in it can be transferred to the regeneration liquid. For the introduction of the regeneration waste liquid of the denitrification catalyst, please refer to: Xiao Yuting et al., Research on regeneration and cleaning of waste denitrification catalyst[J], Electric Power Technology and Environmen...

AI Technical Summary

Problems solved by technology

[0003] In the recycling of the regeneration waste liquid of the denitrification catalyst, the main component to be treated is solid sediment. Since the solid suspended matter in the regeneration waste liquid is mixed with the regeneration waste liquid, the removed solid suspended matter becomes a source of pollution, and the regeneration waste The liquid adsorbs the metal elements that play a poisoning role in the denitrification catalyst, and the metal elements exist in the regeneration waste liquid in an ion state, but it is difficult to fully remove the ionic metals in the regeneration waste liquid by the reaction of the removal agent, which reduces the regeneration waste. Liquid recycling effect

[0004] In the prior art, there are also some technical solutions for the recycling process of denitrification catalyst regeneration waste liquid. For example, a Chinese patent with application number 2016112234625 discloses a recycling process for waste denitrification catalyst regeneration waste liquid. The denitrification catalyst regeneration waste liquid removes mechanical impurities, then extracts the acid liquid, and passes the acid liquid into the pickling process of the waste denitrification catalyst regeneration process for reuse, and passes the acid-removed waste liquid into the extraction tower to remove the acid liquid. vanadium ions; then pass the waste liquid from the removal of vanadium ions into an anion-cation exchange bed, remove salts and purify the waste liquid into deionized water, and pass the deionized water into the diffusion dialyzer for the recovery of acid liquid, this technical scheme It can realize zero discharge of waste liquid, effectively avoid resource waste, save the cost of waste water treatment, and the process is simple and easy to operate; meanwhile, it also provides a waste denitrification catalyst regeneration process, including the waste denitrification catalyst regeneration waste liquid mentioned above The recycling process of this process has low operating costs, and the waste water produced is recycled by itself, which will not pollute the environment; however, the technical solution does not treat the waste liquid mixed with mechanical impurities, so that Some regenerated waste liquid components cause secondary pollution, which is not conducive to the harmless recovery of mechanical impurities

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