Tungsten and Molybdenum Separation Strategy

In order to solve the problem of tungsten and molybdenum separation, some scholars have provided a complex amine hydroxamic extractant extraction method for tungsten molybdenum separation in tungsten molybdate solution, to solve the problem of deep separation of tungsten molybdenum with tungstate solution, to prepare a high purity sodium molybdate solution. The purpose of this study is to remove the tungsten in molybdate solution by using solvent extraction, such as hydrogen peroxide oxidation, vulcanizing agent vulcanization and EDTA complexation without adding other steps to prepare high purity molybdate.

The concentration of tungsten in sodium molybdate solution is first adjusted before extraction so that the mass ratio of tungsten / molybdenum elements in the solution is in the range of 1/5-1/100, and the pH value of sodium molybdate solution is adjusted by dilute acid or dilute alkali solution, the pH is adjusted to 3-6.

At a certain temperature, the organic phase and molybdate solution containing molybdate were mixed in a liquid funnel at a certain temperature. After a certain time, the organic phase and the high pure sodium molybdate solution of the loaded tungsten and a small amount of molybdenum were obtained after the organic phase, the molybdate solution containing molybdate were mixed in the liquid funnel at a certain temperature. The ratio of the mass percentage of the components in the compound amine hydroxamic diluent extraction system is (1-4): 1: (95-98), the compound amine is a mixture of primary amines and secondary amines. The mixture mass percentage is (1-3): 1, the extraction temperature range is 10~50°C, the extraction time is 1~30 min.

The concentrated solution containing a small amount of tungsten and molybdenum and the regenerated organic phase are obtained by alkali solution. The concentration of the stripping agent is 0-15%, the stripping temperature is 30-70°C, the stripping time is 10-60min, the metal can be completely reextracted and the organic phase can be regenerated.

Through the above process, the purpose of purifying sodium molybdate is achieved by deep removal tungsten. Under the optimum test conditions, the first stage extraction can remove 95.7% of tungsten. After second stage extraction, the removal rate of tungsten will exceed 99.95%, the quality ratio of tungsten and molybdenum in sodium molybdate is less than 1/10000. The tungsten obtained by two processes can effectively recover resources. The system is simple in operation and no other treatment is needed before extraction.

• < Prev
• Next >