Comprehensive utilization technology of iron ore sintering dust

Abstract

The invention discloses a comprehensive utilization process of iron ore sintering dust ash. The process comprises the following steps: a, adding vanadium industry mixed salt slag and diethanol amine into water, adding the iron ore sintering dust ash to leach after dissolution and separating to obtain lead slag and a leachate; b, adding sodium sulfide according to the content of copper and silver in the leachate obtained in the step a to react and filtering to obtain copper and silver enriched slag and a filtrate; c, adding sodium perchlorate according to the content of potassium ions in the filtrate obtained in the step b to react and filtering to obtain a potassium perchlorate precipitate and a filtrate; d, washing and drying the potassium perchlorate precipitate to obtain a potassium perchlorate product; e, adding activated carbon and polysilicate aluminum ferrite in the filtrate obtained in the step c to react and filtering to obtain a colorless transparent filtrate; f, evaporating, concentrating and crystallizing the colorless transparent filtrate and carrying out solid and liquid separation to obtain an industrial sodium chloride product. The comprehensive utilization process has the benefits that potassium, copper and silver in the sintering dust can be effectively extracted, the technological process is simple, the operation is safe, and the social and economic benefits are better.

Description

technical field [0001] The invention belongs to the research field of industrial waste utilization in the metallurgical industry, and in particular relates to a comprehensive utilization process of iron ore sintering soot. Background technique [0002] Iron ore powder sintering soot is the industrial waste collected by the dust collection system during the sintering process of iron ore raw materials in iron and steel enterprises. Its main components are: K 2 O20~35%, Na 2 O5~8%, Cl25~35%, Pb8~15%, Cu0.8~1.5%, Fe10~15%, CaO5~8%, Al 2 o 3 0.1~1.0%, MgO0.5~1.2%, SiO 2 3-5%, Ag200-400g / t. [0003] At present, the treatment process of iron ore powder sintering soot is mainly to extract metal elements such as lead and zinc in the slag by volatilization after mixing with blast furnace gas mud, and a large amount of valuable potassium chloride contained in the slag has not been properly recovered. Recycling and utilization; or adding to the blast furnace as a raw material for b...

AI Technical Summary

Problems solved by technology

The above method adopts water leaching to extract raw materials, and the leaching rates of potassium, copper and silver only reach 80-85%, 50-70% and 30-50% respectively, and the extraction rate is low, and part of the lead enters in the form of lead chloride. The leaching solution causes the loss of lead in the leaching slag. At the same time, because the leaching solution contains a large amount of sodium chloride after the purification treatment, due to the enrichment of sodium chloride, only about 70% of high-quality potassium chloride products can be obtained. The remaining products are mixtures of potassium and sodium, and the content of potassium chloride can only reach 60-70%.