| 摘要 |
A process for recovering concentrated, purified tungsten values, such as ammonium paratungstate, from a brine containing minor amounts of soluble tungsten and a substantial concentration of impurities, the brine having a pH in the range of from about 7.0 to about 8.5. In general, the process comprises: contacting the brine with a substantially water-insoluble ion exchange resin to adsorb the soluble tungsten; eluting the adsorbed tungsten values from the ion exchange resin; treating the eluate to convert the tungsten values to an extractable species; recovering the extractable species of tungsten values from the eluate to substantially concentrate the tungsten values; contacting the concentrated tungsten values with an extractant to substantially load the extractant with the concentrated tungsten values; and recovering from the extractant a product having concentrated, purified tungsten values.
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