A method for stabilizing leachate in calcification vanadium extraction process

Abstract

The invention discloses a method for stabilizing a leaching solution in a calcification vanadium extraction process and relates to the technical field of vanadium oxide extraction. The method solves the problem that in the leaching solution standing process in a calcification vanadium extraction process, part of vanadium is precipitated out, and the vanadium loss is caused. According to the technical scheme, the initial pH value of the leaching solution is detected firstly, a stabilizer is added to the leaching solution, and the pH value of the leaching solution is adjusted to range from 2.5 to 4.0; when the initial pH value of the leaching solution is larger than 4.0, the stabilizer is organic strong acid or a mixed solution of the organic strong acid; when the initial pH value of the leaching solution is smaller than 2.5, the stabilizer is soluble alkali or a mixed solution of the soluble alkali; and then liquid-solid separation is conducted on the leaching solution with the adjusted pH value, and filter residues and the qualified leaching solution are obtained. According to the method, the pH value of the leaching solution in the calcification vanadium extraction process is adjusted to range from 2.5 to 4.0 by selecting different stabilizers, high-concentration vanadate ions and NH4<+>, or H<+> or Mn<2+> in the leaching solution are prevented from generating vanadium precipitation under the induction of suspended matter with fine particles, the leaching solution is stabilized, the problem that leached vanadium precipitates again in calcification clinker is avoided, and the recycling rate of vanadium is guaranteed.

Description

technical field [0001] The invention relates to the technical field of extracting vanadium oxide, in particular to a method for stabilizing leachate in a calcification vanadium extraction process to prevent loss of vanadium in the leachate. Background technique [0002] Vanadium has many valuable physical and chemical properties and mechanical properties, is widely used in modern industrial technology, and is an important strategic material. At present, the mainstream vanadium extraction processes include "low-phosphorus vanadium slag sodium roasting → hot water leaching" and "low phosphorus vanadium slag calcification roasting → sulfuric acid leaching", of which the latter has more advantages in terms of environmental protection and production costs. the trend of. The phosphorus content in low-phosphorus vanadium slag is generally below 0.6%. The calcification vanadium extraction process is to convert the vanadium in the vanadium slag into acid-soluble calcium vanadate (ma...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for stabilizing the leaching solution in the calcification vanadium extraction process, which solves the problem that part of the vanadium precipitates out during the standing process of the leaching solution in the calcification vanadium extraction process, causing vanadium loss