Method for extracting rhenium from rhenium-rich concentrates

Abstract

The invention provides a method for extracting rhenium from rhenium-rich concentrates. The method comprises the following steps of: mixing the rhenium-rich concentrates with quick lime, grinding a mixture, feeding oxygen-enriched air into the mixture, and roasting the mixture at a temperature of 400-900 DEG C; sizing and immersing the roasted mixture by using water, and filtering after the immersion is finished; adding an impurity removing agent into the filtered liquid so as to remove calcium and trace heavy metal ions; filtering after removing impurities; and carrying out ion exchange process on the filtered liquid, which is subjected to impurity removal and filtering, through anion exchange resin, obtaining ammonium rhenate solution after desorption, and obtaining ammonium perrhenate through reconcentration and crystallization. According to the method provided by the invention, quick lime oxygen-enriched roasting and water immersion are used, so that the operations of decoppering, arsenic removal and desulfuration are carried out, therefore rhenium, arsenic and sulfur are oxidized sufficiently under the oxygen enrichment condition; the rhenium, arsenic and sulfur are combined with calcium oxide, so that insoluble substances are generated; the effects of removing copper, arsenic and sulfur are more thorough in the water immersion condition, and the disadvantage that the calcium content is high in the quick lime roasting and water immersion technology is solved through using the impurity removing agent to remove impurities; and the recovery rate of rhenium is high, so that the method provided by the invention is favorable to industrialized application.

Description

technical field [0001] The invention relates to the field of metal extraction, in particular to a method for extracting rhenium from rhenium-rich concentrate. Background technique [0002] Rhenium and rhenium alloys are mainly used in petrochemical, national defense and aerospace, electronics, metallurgy and other fields due to their excellent properties. As a rare element, rhenium is mainly associated with molybdenite, and a small amount is associated with copper ore. At present, the rhenium-containing solid materials at home and abroad are mainly derived from molybdenum concentrate roasting soot. The main form of rhenium in roasting soot of molybdenum concentrate is ReO 2 、ReO 3 、Re 2 S, ReS 2 . [0003] For molybdenum concentrate roasting soot treatment methods are divided into two modes: full wet treatment and pyro-wet combined treatment. Among them, there are two types of full wet treatment, one is oxygen pressure leaching, and the other is oxidant leaching. The...

AI Technical Summary

Problems solved by technology

The quicklime roasting + water leaching process adopts the method of mixing roasting molybdenum concentrate roasting soot and calcium oxide under air conditions to generate calcium molybdate (insoluble matter) and calcium rhenate (easily soluble matter), and water leaching to separate molybdenum and rhenium. The concentration of calcium ions in the water immersion solution is 1-1.5g / L. Under alkaline conditions, calcium ions are easy to crystallize and precipitate, which is very unfavorable for the subsequent separation and purification of rhenium.

[0004] There is no report on the treatment of rhenium-rich concentrate extracted from copper smelting waste acid

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