Wet process detoxifying processing device and method for chromium slag and contaminated soil of chromium slag

Abstract

The invention discloses a wet process detoxifying processing device and method for chromium slag and contaminated soil of the chromium slag. The processing device comprises a screening and breaking system, a wet process detoxifying system, a water removing system and a seepage water collecting system. In the screening and breaking system, the chromium slag and the contaminated water of the chromium slag are conveyed to a vibrating screen by a feeding hopper through a belt conveyor and are conveyed to a breaker after being screened; after the chromium slag and the contaminated soil are broken to have the certain grain size through the breaker, the chromium slag and the contaminated soil are conveyed to the wet process detoxifying system; detoxifying chemicals are added into the wet process detoxifying system; after sufficient mixing and complete reacting are completed, a flocculating agent is added, and the mixture is conveyed to the water removing system through a submerged pump; a soil engineering pipe bag is adopted in the water removing system, after water removing of the water removing system is conducted, more than 99% of solid particles are reserved in the soil engineering pipe bag; and the seepage water is reused into the wet process detoxifying system after being collected. The wet process detoxifying processing device and method for the chromium slag and contaminated soil of the chromium slag have the beneficial effects that an operation effect is good, secondary pollution is avoided, and zero emission of waste water is achieved.

Description

technical field [0001] The invention relates to a wet detoxification treatment device and treatment method related to the field of environmental protection, in particular to a wet detoxification treatment device and treatment method for chromium slag and its polluted soil. Background technique [0002] Chromium slag is a toxic waste slag produced during the production of chromium salts, and the harmful substances in it are mainly soluble hexavalent chromium. Hexavalent chromium is easily absorbed by the human body and has strong oxidative properties. On the one hand, it can oxidize biomolecules (DNA, RNA, protein, enzyme) and damage biomolecules; on the other hand, in the process of reducing hexavalent chromium to trivalent chromium, Irritant and corrosive to cells, causing dermatitis and ulceration. Chromium-containing dust will be scattered with the wind, polluting the surrounding air and farmland; chromium-containing slag and its polluted soil are washed by rainwater, ca...

AI Technical Summary

Problems solved by technology

The cost of dry detoxification is high and it is easy to cause secondary pollution. Wet detoxification will produce a large amount of waste liquid, and the moisture content of the waste residue after detoxification is high, which affects the further resource utilization of waste residue

The existing chromium slag detoxification method is relatively cumbersome and there is no special commercialized chromium slag detoxification equipment

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