Method for separating tungsten and molybdenum

Abstract

The invention relates to a method for separating tungsten and molybdenum. The method comprises the following steps: (1) adding acid into a tungsten-molybdenum mixed solution and adjusting pH value to obtain mixed sediment of tungsten acid and molybdenum acid; (2) adding hydrogen peroxide and acid into the mixed sediment to form peroxide tungsten acid and peroxide molybdenum acid; (3) heating an obtained mixed solution, adding tungsten powder, reacting and filtering to obtain tungsten acid sediment and a molybdenum-containing acid solution; (4) calcining the prepared tungsten acid to prepare tungsten trioxide or dissolving by using ammonium hydroxide to obtain an ammonium tungstate solution and then evaporating and crystallizing to prepare APT; (5) extracting the molybdenum in the obtained molybdenum-containing acid solution by using an extraction agent / ion exchange resin; and (6) reversely extracting molybdenum-containing organic phase / resin by using ammonium hydroxide to obtain the ammonium molybdate solution, and carrying out acid precipitation to obtain ammonium tetramolybdate. The production process of tungsten-molybdenum products is taken into account in the method, so that the separated tungsten acid or molybdenum can be directly used for preparing the products thereof; the separation effect is excellent; the operation process is simple and is liable to control; the industrial popularization and application are liable to implement.

Description

technical field [0001] The invention relates to the field of rare metal metallurgy, in particular to a technical method for separating tungsten and molybdenum in the smelting process of tungsten and molybdenum. Background technique [0002] With the continuous mining and consumption of high-quality tungsten-molybdenum ore resources, complex tungsten-molybdenum paragenetic mineral resources are gradually being exploited and utilized. However, the impurity content in tungsten and molybdenum products seriously affects its performance. For tungsten products, the most difficult impurity element to remove is molybdenum, and for molybdenum products, tungsten is the most difficult to separate. In order to improve the performance of tungsten and molybdenum products, complete separation of tungsten and molybdenum is necessary. Therefore, the separation of tungsten and molybdenum is the key to efficiently utilize these tungsten and molybdenum intergrowth mineral resources. [0003] H...

AI Technical Summary

Problems solved by technology

However, the industrial application of this method is limited due to the crystallization problem of paratungstate, the generation of tungsten and molybdenum polymer ions, and the little difference in the properties of these ions themselves.

(2) The above methods cannot be applied to remove trace tungsten from molybdate solution

(3) The above methods are basically aimed at the removal of trace amounts of tungsten or molybdenum, but there is no mature separation technology for solutions with similar tungsten and molybdenum contents

Although this method has a certain effect, but the high-concentration tungsten precipitates that have entered the solution through alkali decomposition, the subsequent recovery of these tungsten needs to re-decompose the tungsten-containing precipitates, resulting in unnecessary loss of raw materials, making the entire separation of tungsten and molybdenum greatly increased cost