Method for separating molybdenum and rhenium through extracting under acidic condition

Abstract

The invention discloses a method for separating molybdenum and rhenium through extracting under the acidic condition. The method comprises the following steps that (1) the pH value of mother liquid isadjusted, an extraction agent I and the mother liquid are evenly mixed and subjected to standing to be separated, molybdenum is extracted into an organic phase, rhenium is left in extraction raffinate, the organic phase loaded with molybdenum is subjected to reverse extraction through an alkaline reverse extraction agent I, and a molybdate solution is obtained; and (2) the pH value of the extraction raffinate obtained by extracting molybdenum is adjusted, the extraction raffinate and an extraction agent II are mixed and subjected to standing to be separated, rhenium is extracted into an organic phase, the organic phase loaded with rhenium is subjected to reverse extraction through an alkaline reverse extraction agent II, and a rhenate solution is obtained. According to the method, by adjusting the pH value of the solutions, the organic phase loaded with molybdenum and the organic phase loaded with rhenium can be obtained through extraction, washing and impurity removing are not needed, after reverse extraction through the alkaline reverse extraction agents, the high-purity molybdate solution and the high-purity rhenate solution are obtained, the technological process is short, operation is easy, and the wide application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy of molybdenum and rhenium, and in particular relates to a method for extracting and separating molybdenum and rhenium under acidic conditions. Background technique [0002] Both molybdenum and rhenium are rare precious metals, which have broad application prospects in industry: molybdenum and its compounds are widely used in steel, metal processing, electrical, metallurgy, building materials, machinery, petroleum, anti-corrosion, pigments, agriculture, military and other industries. Application: Rhenium and its compounds have excellent characteristics and catalytic properties, and are widely used in aviation, aerospace, medicine and catalysts and other fields. There are about 20 kinds of molybdenum ores that have been discovered so far. The ones with industrial value mainly include molybdenite, calcium molybdate ore, iron molybdate and lead molybdate ore, among which molybdenite is the mos...

AI Technical Summary

Problems solved by technology

The extraction method has been widely used in the hydrometallurgy of molybdenite because of its good selectivity, large production capacity and low cost, especially for the separation and recovery of molybdenum and rhenium from the mother liquor of decomposed molybdenite. Generally, a low-concentration amine extractant (such as N 235 , Alamine336, Alamine304, trioctylamine and tridecylamine, etc.) to extract rhenium, and then use high-concentration amine extractant to extract molybdenum, but in the process of extraction, the metal cations in the mother liquor (such as Fe 3+ 、Cu 2+ etc.) are easy to enter the organic phase, and generally need to be washed to remove Fe 3+ 、Cu 2+ and other impurities, the process is long, the operation is complicated, time-consuming and labor-intensive

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