A method for co-extraction-selective stripping separation of vanadium and chromium from vanadium-chromium-containing solution

Abstract

The invention discloses a method for co-extracting-selective back-extracting and separating vanadium and chromium from a solution containing vanadium and chromium, using an ammonium salt extraction agent to carry out co-extraction of vanadium and chromium, and then utilizing the ability of vanadium and chromium to combine with the extraction agent under specific conditions The difference between vanadium and vanadium is selectively stripped by alkaline solution, and finally chromium is stripped by chloride salt or solid phase precipitation to achieve the separation of chromium. Chromium can obtain different types of chromium products according to different needs; the organic phase can also adopt different types according to system requirements. The invention has the characteristics of good vanadium-chromium separation effect, short process, simple process and high vanadium-chromium recovery rate.

Description

A method for co-extraction-selective stripping and separating vanadium and chromium from vanadium-containing chromium solution technical field The invention belongs to the field of metallurgical separation, be specifically related to a kind of co-extraction-selective stripping separation from vanadium-containing chromium solution Vanadium, chromium method. Background technique [0002] Vanadium slag is the main industrial raw material for vanadium extraction, and my country's vanadium slag mainly comes from the pyrometallurgical process of vanadium titanomagnetite. Vanadium titanomagnetite is a composite ore in which a variety of valuable elements such as iron, vanadium, titanium, and chromium coexist. Due to the similar properties of vanadium and chromium, fire The trend of vanadium and chromium in the smelting process is basically the same, and the obtained vanadium slag is actually a kind of chromium-containing vanadium slag. The current mainstream of vanadium slag ...

AI Technical Summary

Problems solved by technology

At present, the extraction and separation of vanadium and chromium in vanadium and chromium-containing solutions mainly uses primary amine extractants to selectively extract vanadium, and then selectively extract chromium; The process is complicated and the cost is high

Chinese patent 200610089232.4 discloses a process for extracting and separating vanadium and chromium with primary-secondary amines, using primary-secondary amines to selectively extract vanadium, leaving chromium in the water phase, then recovering chromium by reduction precipitation, and recovering vanadium by ammonium salt precipitation; The method can realize the separation and recovery of vanadium and chromium, but recovering chromium in the form of hydrated chromium oxide requires a large amount of reducing agent to reduce Cr(VI) to Cr(III). In addition, there are many impurities entrained in the precipitation process of hydrated chromium oxide, and it is difficult to obtain pure substances.

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