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Introduction to separation and enrichment of molybdenum and rhenium

  • Mosten
  • 29 Oct

Ion exchange separation of molybdenum and rhenium is based on the high selectivity of the resin for specific ions such as mo. baht. In the solution, Lai and Mo exist in the anion form of REO * and moo. Under weak acid conditions, both of them can exchange with the anion resin and can be adsorbed on the resin, Based on the different affinity of molybdenum, deficiency and anion resin, when the affinity of anion form of molybdenum or with resin is less than that of anion and resin in eluent, the desorption reaction of molybdenum or rhenium occurs. Therefore, the separation of molybdenum and rhenium can be achieved by using different desorption solution and controlling reaction conditions.

The conditions and mechanism of adsorption and desorption of molybdenum on d-314 macroporous anion exchange resin in neutral system were studied. The effects of pH value and flow rate on the adsorption rate were investigated. The optimum adsorption conditions were determined as pH = 7 and flow rate of 1.0 ml / min. For the desorption test, the effects of different desorber concentration and desorber flow rate on the desorption of molybdenum and nickel were studied. The results show that the desorption rate of molybdenum and rhenium by ammonia water is very large. Adding ammonium nitrate into ammonia water can desorb most of molybdenum, but can not fully decompose the absorption; when the concentration of ammonia water reaches 1.5%, the desorption rate of Lai is 100%, and the concentration of ammonia water is 2%, The desorption of molybdenum is close to equilibrium, reaching 92.21%, while the flow rate has little effect on the desorption rate of molybdenum. At last, molybdenum was desorbed with 2% ammonia water + 2% ammonium nitrate solution at a flow rate of 4 ml / min, and then desorbed with 6% ammonia solution at a flow rate of 2 ml / min. the desorption rate of molybdenum in the mixed solution was 92.40%, and there was 3.32% loss of rhenium during molybdenum desorption, and the desorption rate of rhenium was 83.96%. The author thinks that molybdenum and molybdenum can be separated by step desorption.

D201 resin was used to study the adsorption and desorption of Al and Ni in the stripping solution obtained from sodium chlorate leaching solution of molybdenite. The static and dynamic desorption experiments were carried out. The effects of desorption time, acidity of desorption solution, mass fraction of desorption agent and desorption temperature on the desorption of molybdenum were studied. The optimal conditions were determined as follows: 30 ℃, pH = 8, When the desorption time was 10 min, the concentration of NH and SCN was 14% (mass fraction), the desorption rate of Mo was 98.91% and 15.12%.

The adsorption and desorption of molybdenum and rhenium on D301 resin were studied. The effect of acidity on the adsorption of molybdenum and nickel on D301 resin was studied. The results showed that the optimum acidity for adsorption of molybdenum and rhenium was pH = 1, the adsorption rate of baht was more than 95%, and the adsorption rate of molybdenum and rhenium was more than 80%. When the pI value was 6-10, the separation coefficient of D301 resin for molybdenum and rhenium was very large, which provided a good acidity condition for the separation of molybdenum and rhenium.

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molybdenum