| 摘要 |
The present invention relates to a process for producing pure ammonium metallates of the metals W, Mo, V, Cr and Re, in which alkaline metal salt solutions are set at a pH in the range from 5 to 9 by reaction with CO2, said metal salt solutions are produced through an anion exchanger in carbonate form, whereupon the ion exchanger is produced under the metallate form besides the alkaline carbonate solution, the ion exchanger is then washed without alkali and then eluted by means of aqueous ammonia with the formation of ammonium metallate solutions and of the anion exchanger in the OH form, the anion exchanger being converted into the carbonate form by CO2 treatment and recycled.
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