Method for recovering tungsten and molybdenum from phosphor middling

Abstract

The invention relates to a method for recovering tungsten and molybdenum from phosphorus middling ore, which relates to a method for recovering the tungsten and the molybdenum from the phosphorus middling ore (containing 15 to 30 percent of P2O5). Minerals to be processed are minerals which undergo primary floatation and enrichment and contain 15 to 30 percent of P2O5, wherein the content of the apatite is about 30 percent, the content of the dolomite is more than 15 to 20 percent, and scheelite and a small amount of calcium molybdate mine and molybdenite are accompanied. Moreover, the content of WO3 is between 12 and 25 percent; the content of Mo is between 2 and 6 percent; and the mass ratio of the Mo to the WO3 is between 12 and 40 percent. By application of the processing method provided by the invention, more than 50 percent of mine which is easy to be acid soluble including the apatite completely enters into a solution and simultaneously more than 60 percent of molybdenum and a small amount of tungsten enter into the solution as well; and the content of the WO3 in the tunstite left is between 50 and 70 percent, and the mass ratio of the Mo to the WO3 is reduced to 5 percent. The method has the advantages that the technololgy is simple and easy; the reagent is single; the separation effect of P-WO3 and Mo-WO3 is good; and three valuable elements including P, Mo and W can be respectively recycled.

Description

technical field [0001] The present invention relates to a kind of ore (containing P) from phosphorus 2 o 5 15% to 30%) to recover tungsten and molybdenum. Background technique [0002] There is a mixed calcium-containing mineral in nature, which is composed of apatite, calcite (or dolomite), calcium tungstate, calcium molybdate, accompanied by a small amount of molybdenite, pyrite and other minerals. The sulfide ore and some calcite can be sorted out by flotation to obtain a P-containing 2 o 5 Calcium tungstate and calcium molybdate are also enriched correspondingly during the flotation process of 15% to 30% phosphorus ore. A kind of phosphorus, tungsten and molybdenum mixed ore with an apatite content of more than 30% and apatite, calcite, and dolomite, which are easily acid-soluble calcium-containing minerals, account for more than 50% of the total. Among them WO 3 The content fluctuates from 12% to 25%, and the Mo content fluctuates from 2% to 6%. Mo / WO 3 The mass...

AI Technical Summary

Problems solved by technology

[0007] P 2 o 5 Phosphorus concentrate with a content >30% is generally decomposed by sulfuric acid method, P 2 o 5 Phosphorous ores with a content of less than 30% can be decomposed with hydrochloric acid, but there has never been any report on the treatment of phosphate rocks containing calcium tungsten (molybdenum)

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