Method of iron extraction and removal with solvent extraction agent

Abstract

The invention relates to a method of iron extraction and removal with solvent extraction agent and belongs to the technical field of wet metallurgy. The method includes processes of extraction, reverse extraction and iron precipitation conversion. The detailed operation is that an organic phase is used for extracting iron in an aqueous phase, then an iron-rich organic phase is obtained, iron reverse extraction agent is directly used for reversely extracting iron, or firstly, non-ferrous metals are reversely extracted with mineral acid, and then the iron reverse extraction agent is again used for reversely extracting the iron. The iron reverse extraction agent is hydrochloric acid-chloride solution, wherein the concentration of C1- is 4-18 mol / L, and the concentration of H+ is 0.2-3 mol / L. At the time of reverse extraction, contact reverse extraction is carried out on the iron-rich organic phase and the reverse extraction iron agent according to the volume rate of 0.3-3:1. After phase splitting, an iron content water phase and a blank organic phase are obtained. The blank organic phase is washed with acid water and then returned to the extraction process for recycling. Alkaline substance is added into the iron content water phase and the value of potential of hydrogen (pH) is adjusted to 2.5-8.5, iron precipitation is filtered, and iron containing filter residues and chloride solution are obtained. The hydrochloric acid is added into the chloride solution, the concentration of H+ is adjusted to 0.2-3mol / L, then the chloride solution is returned to the iron reverse extraction process for recycling, and iron is comprehensively recovered from the iron content filter residues. The method of the iron extraction and removal with the solvent extraction agent has the advantages of being simple in the technology, good in iron reverse extraction, low in production cost, environment-friendly and the like and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for extracting and removing iron with a solvent extractant, belonging to the technical field of hydrometallurgy. Background technique [0002] Iron is one of the abundant elements in nature. Almost all non-ferrous metallurgical materials contain iron, and the content of iron is often higher than that of valuable metals. During the acid leaching process, iron and valuable metals enter the solution together, and the iron in the leaching solution must be removed as a harmful impurity. Purification and iron removal is an important process in hydrometallurgy. At present, due to the depletion of non-ferrous metal mineral resources and the improvement of environmental standards worldwide, the mining and utilization of polymetallic composite ores and symbiotic ores make the problem of impurity removal more complicated, and the control of iron is particularly important. [0003] Due to the disadvantages of complex operation,...

AI Technical Summary

Problems solved by technology

The iron extraction process of this kind of extractant has been well studied, but the problem of difficult iron stripping has not been well resolved.

However, although the addition of a phase transfer agent can increase the stripping rate of iron, the addition of a phase transfer agent often inhibits the extraction of iron, so it is not suitable to use

Similarly, the addition of reducing agent makes the extraction and iron removal process complicated, the operation time is long, and the cost of iron removal is high

In short, the acidic phosphate extractant extracts and removes iron. Due to the difficulty of iron stripping, the application of this type of extractant in industrial production is in an embarrassing situation.