Method for recovering tungsten from tungsten-containing fluorite mine

Abstract

The invention relates to a method for recovering tungsten from tungsten-containing fluorite mine. Sulfuric acid and tungsten-containing fluorite mine are mixed at a mass ratio of 0.8:1 to 1.5:1, cured, and then roasted at 200-500 DEG C, a fluorite mineral is subjected to acidolysis by sulphuric acid to release hydrogen fluoride (HF), a tungsten mineral is subjected to acidolysis by sulphuric acid to become tungsten trioxide, and the HF and the tungsten trioxide continue to react to generate tungsten hexafluoride (WF6) or tungsten oxytetrafluoride (WOF4); the HF, the WF6 and the WOF4 are all volatile matters and enter roasted flue gas, the flue gas is washed, absorbed and hydrolyzed to obtain tungstic acid, the washed gas is used for producing hydrofluoric acid, and the volatilization rate of fluorine can be higher than 95% while the volatilization rate of tungsten can be higher than 90%. The method for recovering tungsten from tungsten-containing fluorite mine has the advantages that when hydrogen fluoride is prepared, tungsten is fluorated and volatilized and then enters flue gas to achieve high-efficiency extraction of tungsten; the method can be used to treat mixed concentrate produced by bulk flotation of tungsten and fluorite, a flotation-metallurgical process is greatly simplified, and a comprehensive recovery rate is increased.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and relates to a method for recovering tungsten from tungsten-containing fluorite ore. Background technique [0002] Tungsten is an important strategic metal. There are more than 30 countries and regions in the world that have tungsten resources, but the distribution is extremely uneven. The type of foreign tungsten ore is mainly scheelite, accounting for more than two-thirds of the total, and the rest is wolframite and some mixed ores. The world's tungsten resources are mainly concentrated in China, Canada, Russia, the United States and Bolivia, and the five countries together account for 87% of the world's total basic reserves. Tungsten is China's dominant mineral resource. China's tungsten resource reserves account for about 65% of the world's total, ranking first in the world. [0003] my country's tungsten ore has many symbiotic (associated) components, and its comprehe...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the shortcomings of comprehensive recovery of tungsten and fluorite in tungsten polymetallic complex ores, and provide a method for extracting tungsten from tungsten-containing fluorite ore, which is roasted after mixing sulfuric acid and tungsten-containing fluorite ore , Fluorite minerals are decomposed by sulfuric acid to release hydrogen fluoride (HF), tungsten minerals are decomposed by sulfuric acid into tungsten trioxide, hydrogen fluoride and tungsten trioxide continue to react to form tungsten hexafluoride (WF 6 ) or tungsten oxytetrafluoride (WOF 4 ), HF, WF 6 、WOF 4 Both belong to volatile substances and enter the roasting flue gas. The flue gas is washed, absorbed and hydrolyzed to obtain tungstic acid, and the washed gas is used to produce hydrofluoric acid.

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