Clean process method for extracting vanadium, chromium and iron from vanadium slag step by step

Abstract

The invention relates to a clean process method for extracting vanadium, chromium and iron from vanadium slag step by step. The clean process method comprises the following steps of: selectively oxidizing the vanadium slag to obtain a roasted product; leaching the obtained roasted product by using a leaching agent to extract vanadium, carrying out liquid-solid separation to obtain vanadium-containing leach liquor and vanadium-extracted tailings, and carrying out product transformation on the vanadium-containing leach liquor to prepare vanadium series products; adding the obtained vanadium-extracted tailings and a silicon fixing agent to a sodium hydroxide solution, selectively fixing silicon, then oxidizing to extract chromium, then carrying out liquid-solid separation to obtain chromium-containing leach liquor and chromium-extracted tailings, and carrying out product transformation on the chromium-containing leach liquor to prepare chromium series products; mixing the chromium-extracted tailings with a reducing agent, and carrying out magnetizing roasting and magnetic separation to obtain silicon slag and ion concentrate powder / iron-enriched slag / reduced iron powder. The clean process method disclosed by the invention realizes the step-by-step extraction and high-efficiency separation of valuable components such as vanadium, chromium and iron which are contained in the vanadium slag, prevents the mutual entrainment of vanadium, chromium and iron products; in addition, the clean process method disclosed by the invention realizes the near zero discharge of waste water and the recycling of final slag and is clean and pollution-free.

Description

technical field

[0001] The invention relates to the field of comprehensive utilization of nonferrous metal metallurgy and resources, in particular to a cleaning process for efficiently extracting vanadium, chromium and iron in vanadium-chromium slag step by step. Background technique

[0002] Vanadium and chromium are important strategic resources of the country, and the positions of vanadium and chromium products in the national economy are irreplaceable. Vanadium-containing minerals (such as vanadium-titanium magnetite) are smelted into molten iron, and the vanadium slag with high vanadium content obtained by oxidation blowing is the main raw material for extracting vanadium in my country at present. The composition of vanadium slag produced by blowing of different vanadium-containing minerals is quite different, but they all contain valuable metal components such as chromium and iron together with vanadium, which has high resource utilization value. Ordinary vanadium sla...

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