Process for magnetically separating and recovering iron and carbon from zinc volatilization kiln slag through dry method

Abstract

The invention discloses a process for magnetically separating and recovering iron and carbon from zinc volatilization kiln slag through a dry method, which is characterized by comprising the following processes of: pre-grading before kiln slag separation, performing fine-grain microwave drying-gradient magnetic separation and carbon collection, and separating iron from coarse grains, wherein the process of separating iron from coarse grains comprises the steps of: performing two-stage crushing, performing primary pre-magnetic separation tailings-discarding, performing air classification-dry ball-milling, and performing microwave drying-secondary magnetic separation and cleaning. The method can improve the separating grade of the product, realizes resource recycling, and can be popularized to the field of separating materials with obvious magnetic difference and the like from solid wastes.

Description

technical field [0001] The present invention relates to a set of new technology of all-dry permanent magnetic separation, in particular to a technology for recovery of iron and carbon by dry magnetic separation of zinc volatilization kiln slag; the technology can also be extended to solid waste The field of sorting materials with obvious magnetic differences has certain significance for the comprehensive utilization of valuable components. Background technique [0002] According to the national statistics in 2010, from January to June, my country’s zinc production increased by 30.4% to 2.477 million tons; with the increase of zinc production year by year, zinc volatilization kiln slag is a common industrial solid waste in the zinc smelting industry. At the same time, zinc volatilization kiln slag is rich in a variety of valuable components, the content of which is more: iron and residual coke from zinc smelting, which are relatively common; and currently mature The treatment ...

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Problems solved by technology

[0002] According to national statistics in 2010, from January to June, my country’s zinc production increased by 30.4% to 2.477 million tons; with the increase of zinc production year by year, zinc volatilization kiln slag is a common industrial solid waste in the zinc smelting industry. At the same time, zinc volatilization kiln slag is rich in a variety of valuable components, the content of which is more: iron and residual coke from zinc smelting, which are relatively common; and currently mature The treatment process mainly focuses on the comprehensive recovery of precious metals, but ignores the comprehensive utilization of rich iron and carbon; resource treatment cannot be effectively carried out

[0004] The currently applied separation processes include: the full wet separation process of Zhuzhou Smelter, which consumes a lot of water resources while partially recovering valuable metals, and the later water treatment process is complicated; the semi-dry process of a smelter in Zhejiang, The semi-wet method is combined with the technological process, and the sorting grade and recovery rate are low, which cannot meet the needs of reprocessing in the later stage; at the same time, the corresponding sorting equipment is mostly a drum magnetic separator, and the sorting material is single, and it cannot be used for a variety of magnetic sorting

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