Comprehensive utilization process of zinc-containing iron dust

Abstract

The invention relates to a comprehensive utilization process of zinc-containing iron dust. The process comprises the steps of: uniformly mixing iron-containing dust mud, iron-containing dust, carbon-containing sludge, pyrite residue, first reducing coal and an additive, and carrying out moist grinding, pelletizing and screening to obtain qualified raw pellets; and then uniformly mixing the raw pellets with second reducing coal, carrying out downdraught drying and reduction roasting on a pellet sinter roasting machine to finish sintering of metallized pellets, carrying out nitrogen cooling to room temperature, and discharging to obtain the metallized pellet sintered ore. According to the invention, the process method is simple and convenient for operation; aiming at the characteristics of the zinc-containing iron dust in steel mill, high-efficiency utilization of iron, zinc, carbon and other valuable elements is realized by pelletizing and metallized roasting, and at the same time, harmful elements are removed and secondary pollution is eliminated; at the same time of removing the harmful elements, the zinc-containing iron dust is prepared into metallized pellet sintered blocks, and iron has high grade and low content of zinc, sulfur and other harmful elements, and can be used as a high-quality raw material to be directly entered into a blast furnace for smelting, therefore, the comprehensive utilization process plays an effect of reducing coke and increasing yield on the blast furnace and has significant economic benefits.

Description

Technical field:

[0001] The invention discloses a comprehensive utilization process of zinc-containing iron dust, which belongs to the technical field of iron and steel metallurgy. Background technique

[0002] my country is a big country of steel. Since 1996, when the steel output reached 100 million tons, it has been ranking first in the world. In 2010, the steel output was as high as 628 million tons. Domestically available iron resources are decreasing year by year, and the import volume of iron ore is increasing continuously. In 2010, the imported iron ore reached 630 million tons. At present, the ratio of iron ore imported by most iron and steel plants in the sintering mixture reaches more than 60%. . The severe shortage of iron ore resources has begun to affect the sustainable development and safety of my country's iron and steel industry.

[0003] Zinc-containing iron dust is a by-product produced in the process of ironmaking and steelmaking in iron and steel plant...

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