Method for detoxicating chrome leaching residues through sintering technology

Abstract

The invention discloses a method for detoxicating chrome leaching residues through a sintering technology. The method comprises the steps that the chrome residues are screened and fully mixed with water-quenched slag and coke powder through a blender mixer, the mixture is prepared into particles by adding water, the particles are uniformly distributed on a sintering trolley, the effect that the mixture particles are spread flatly and completely distributed on the sintering trolley to be sintered is ensured, and the ignition temperature is controlled to be 1100-1200 DEG C; the negative pressure of a sintering wind box is controlled to be 12-13 kpa; the vertical sintering speed is less than 18 mm/min; high-temperature finished product sintered ore is subjected to air blast cooling; and screening is conducted, and finished product sintered ore is obtained. The method has the advantages that the process is reasonable, the production energy consumption is low, the cost is reduced, harmless treatment of the chrome residues is achieved, and the detoxication efficiency is high; and the index of Cr6+ in a water leaching sample is lower than the national standard, and the method is suitable for industrial large scale treatment.

Description

technical field [0001] This technology belongs to the field of detoxification of chromium leaching slag, and particularly relates to a method for detoxifying chromium leaching slag by using sintering technology. 6+ Convert to Cr 3+ , and achieve a method that meets the national solid waste discharge standards. Background technique [0002] Most of the chromium leaching slag discharged from chromium salt factories and metal chromium factories in our country is piled up in the open air due to its low utilization value. Chromium slag piled up in the open air, after being washed by rainwater, a large amount of hexavalent chromium ions infiltrate into the soil, polluting surface water and groundwater, and also polluting rivers and lakes, thereby endangering crops and aquatic products as well as human and animal health; Chromium valence dust floats into the air and has a strong carcinogenic effect on the human respiratory tract, digestive tract, skin, and mucous membranes. Even...

AI Technical Summary

Problems solved by technology

Even if the anti-seepage treatment is adopted for the chromium slag piled in the open air, the pollution problem cannot be solved fundamentally

[0003] In recent years, due to the attention of the national environmental protection department, many chromium slag detoxification technologies have emerged in my country, but most detoxification technologies use a large amount of other raw materials, chromium slag only accounts for a small amount of ingredients, the consumption of raw materials is large, the detoxification efficiency is low, and the treatment cost is high. , not conducive to large-scale industrial processing

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