Tungsten and Molybdenum High difficulty Separation

With the continuous exploitation and consumption of high-quality tungsten molybdenum resources, complex tungsten and molybdenum co-occurrence mineral resources are being gradually exploited and utilized. However, the impurity content in tungsten-molybdenum products seriously affects its performance. In order to improve the performance of tungsten-molybdenum products, the complete separation of tungsten and molybdenum is necessary. Therefore, the separation process of tungsten and molybdenum is the key.

However, the extremely similar chemical properties of tungsten and molybdenum lead to the separation of tungsten and molybdenum efficiently, which is a technical problem puzzling tungsten and molybdenum metallurgy. There are three main categories: one is to remove a small amount of molybdenum from the tungstate solution. The second is to remove a small amount of tungsten from the molybdate solution. The third is to separate tungsten and molybdenum from a solution of similar tungsten and molybdenum content.
The solution with similar tungsten and molybdenum content is the most difficult to separate tungsten and molybdenum. Some scholars have published a tungsten molybdenum separation process, which is suitable for the treatment of high concentration tungsten molybdenum mixed solution, which simply includes the following steps:

(1) The acid was added to the mixture of tungsten and molybdenum, and the pH value was adjusted to 1~3. The tungsten and molybdenum were precipitated by tungstate and molybdate respectively. The filtration was washed, and the mixed precipitation of tungstate and molybdate was obtained.

(2) The mixed precipitation of tungstic acid and molybdic acid is added with hydrogen peroxide, the reaction of adding acid and stirring makes tungsten peroxide tungstic acid and molybdenum peroxide molybdic acid.

(3) Tungsten powder was added to control the temperature of the mixture at 25-80°C to precipitate tungsten in the form of tungstic acid.

(4) Tungsten trioxide was prepared by calcination after washing the precipitated tungstic acid, or ammonium tungstate solution was obtained by ammonia solution, then APT was prepared by evaporation crystallization.

(5) Molybdenum in acidic solution containing molybdenum was extracted by extractant/ion exchange resin, and the residual liquid/cross-linking liquid was returned to the mixed solution for use.

(6) The organic phase / resin containing molybdenum is obtained by ammonia stripping, and ammonium molybdate solution is obtained. After acid precipitation, ammonium molybdate is obtained.

The separation of tungsten or molybdenum from the method of separating tungsten and molybdenum by the above process can meet the requirements of 0 grade national standard, which can be directly used in the preparation of its products. The separation effect is good, the operation process is simple, it is easy to be popularized and applied in the industrialization.

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