A kind of slag iron graphite separation and purification process

Abstract

The invention relates to a slag iron graphite separating and purifying process, and belongs to the technical field of graphite recycle from slag iron. According to the technical scheme, the process comprises the following steps: firstly conducting crushing and screening on desulfurated slag, then conducting overflow stirring primary selection, and then putting the material (namely, the processed slag) into a shaking table for fine selection; putting the finely selected material into a soaking tank, adding an acetate contained liquid into the soaking tank, conducting reaction on the acetate contained liquid and calcium oxide, magnesium chloride and aluminium oxide in the desulfurated slag, and further removing impurities; finally conducting spin-drying and stoving on the material to obtain the graphite finished product. The process has the advantages that active effects that the fixed carbon content of the slag iron material subjected to crushing and screening (1) and overflow stirring primary selection (2) is 65-75%, and the fixed carbon content of the finished product subjected to shaking table fine selection (3), treatment by adding the acetate contained liquid into the soaking tank (4), spin-drying (5) and stoving (6) is 93% or above. The acetate contained liquid is added for treating the slag iron, so that environment pollution can be avoided; the process is simplified, the cost is reduced, the environment pollution problem is avoided, and the fixed carbon content of the flake graphite is relatively high.

Description

technical field [0001] The invention relates to a process for separating and purifying slag-iron-graphite, in particular to a method for recovering flake graphite from desulfurization slag produced during desulfurization in iron and steel production, and belongs to the technical field of graphite recovery from slag-iron. Background technique [0002] In iron and steel production, a large amount of desulfurization slag, referred to as slag iron, will be produced during the desulfurization process of molten iron; slag iron will be mixed with flake graphite, which is easy to float and cause environmental pollution. Background technology mostly uses strong acid for recycling, which pollutes the environment; Chinese patent application 2015103120211, titled "a method for recovering flake graphite from molten iron desulfurization slag", the specific steps of the method are: firstly, the desulfurization slag is broken, and the iron is recovered by magnetic separation , the tailings ...

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Problems solved by technology

Background technology mostly uses strong acid for recycling, which pollutes the environment; Chinese patent application 2015103120211, titled "a method for recovering flake graphite from molten iron desulfurization slag", the specific steps of the method are: firstly, the desulfurization slag is broken, and the iron is recovered by magnetic separation , the tailings are crushed to less than 1mm and water is added to make a slurry with a concentration of 30-40%, and the flotation agent is added into the flotation machine for flotation, and the scum is added with water to make a slurry with a concentration of 50-70% and ball milled for 10-30min, then Iron is recovered by magnetic separation, and the tailings are added with water to make a slurry with a concentration of 30-50%, which is sent to a flotation machine for flotation. The flotation agent is "kerosene + No. 2 flotation oil" or "liquid paraffin + octanol" Composition, the recycled flake graphite is processed through multiple "ball milling-magnetic separation-flotation" processes to improve the grade, and the fixed carbon content in the finally obtained flake graphite can reach more than 90%; The agent also has the problem of polluting the environment, and the fixed carbon content in flake graphite is low

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