Method for Co-production of Chromium Salt and Electrode Material from Electric Arc Furnace Dust

Abstract

The invention discloses a method for co-producing chromium salt and an electrode material by electric arc furnace dust. The method includes the following steps: first, grinding raw materials; second, stirring, standing, filtering and separating filtrate and dust filter residues; third, drying the dust filter residues, continuing adding water and stirring and separating the dust filter residues and the water; fourth, adding one of transition metal oxide, transition metal salt, rare-earth element oxide or rare-earth element salt and continuing grinding; fifth, performing heating and modification by calcination; sixth, continuing washing, drying and grinding modified dust to obtain the electrode material; seventh, combining the filtrate to obtain chromium salt extracting solution, and performing evaporative crystallization to obtain the chromium salt and reusable evaporated liquid. The industrial waste electric arc furnace dust serves as a raw material, resources are efficiently and completely used by a simple and feasible process, waste is turned into wealth, zero discharge of waste is realized, secondary pollution is greatly relieved and even eliminated, and the method has huge economic benefits and market prospect.

Description

technical field [0001] The invention relates to the technical field of dust comprehensive utilization, in particular to a method for preparing chromium salts and electrode materials using electric arc furnace dust as raw materials. Background technique [0002] With the rapid development of industrial production, the types and quantities of industrial solid waste continue to increase. As a pillar industry of my country's national construction, the iron and steel industry produces a large amount of waste residue, waste water, and smoke during its production process. However, the domestic treatment methods for iron and steel solid waste are not fully mature, and the waste composition is complex, so the amount of treatment is very small. Most of the solid waste is stacked in the open air or landfilled, which not only occupies land resources, but also causes serious pollution to the environment. endanger people's health. In recent years, with the country's increasing emphasis ...

AI Technical Summary

Problems solved by technology

In the early days, the electric arc furnace dust was mainly treated by vitrification and then landfilled. After mixing the electric arc furnace dust with clay or silica, aluminum oxide and other fluxes, it was smelted at 1100-1200 °C, and the output met the requirements of the environment. The dense and stable solidified slag that protects the standard cannot realize the full utilization of dust, and there is still a large amount of industrial waste slag after recycling valuable metals

[0008] At the same time, dust treatment cannot copy the treatment method of iron and steel metallurgical production waste slag. This is because the dust composition is relatively more complex, especially it contains a large amount of heavy metals. Developing a method for comprehensive treatment of dust has important theoretical and practical significance for the recycling of metallurgical waste, the development of high value-added products, the improvement of the comprehensive utilization of dust, the exploration of new application fields and even large-scale production

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