Process method for vanadium extraction from steel slag tailings

Abstract

The invention belongs to the fields of metallurgy and solid waste comprehensive utilization, and in particular relates to a method for extracting vanadium in vanadium-containing steel slag tailings. The invention aims at providing a high-yield and stable process for recovering vanadium and iron in steel slag for comprehensive utilization, value improvement and vanadium resource recovery of low-vanadium steel slag, wherein recovery rates of both vanadium and iron are above 90%. The process comprises steps of A, preparing materials: combing raw material low-vanadium steel slag tailings with an auxiliary material A and a load vector B, wherein the low-vanadium steel slag tailings account for 40-65%, the auxiliary material A accounts for 14-20% and the load vector B accounts for 15-46%; B, reducing and melting various materials in a submerged arc furnace to obtain low-vanadium pig iron and reduced water slag; and C, hot-charging the low-vanadium pig iron obtained from the step B under a liquid status to a converter, adding a coolant C, and implementing oxygen blowing vanadium extraction to obtain vanadium slag and semi-steel. The vanadium extracting process adopts many waste materials in whole using process, and is short in flow, short in time, high in vanadium recovery rate, free from newly generated solid waste, free from discharge of tailings, and energy-saving, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of metallurgy and solid waste, and in particular relates to a process method for extracting vanadium from tailings of vanadium-containing steel slag. Background technique [0002] At present, there are mainly three kinds of vanadium extraction from steel slag at home and abroad, wet vanadium extraction, pyrovanadium extraction and solvent extraction. Wet vanadium extraction has developed well, and there are three domestic patents for wet vanadium extraction from steel slag. The process of wet vanadium extraction from steel slag includes crushing, roasting, leaching, precipitation and pyrolysis. However, the wet vanadium extraction requires a large amount of acid solution, which is easy to cause pollution, and has high requirements on the operation process, otherwise the loss rate of vanadium will be high. [0003] The process route of solvent extraction method is generally: preparation o...

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Problems solved by technology

However, because the raw material structure is relatively single, carrier B is not used in the reduction process, and the ratio of various raw materials is not scientific enough, so the recovery rate of vanadium and iron is unstable and fluctuates greatly, and the vanadium content in the vanadium-containing pig iron is unstable. The lowest vanadium recovery rate is only 75%, and the lowest iron recovery rate is only 80%

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