Equipment and method for purifying ammonium tungstate solution

Abstract

The invention discloses a device and a method for purifying ammonium tungstate solution. The device comprises: a device body, which defines a feed area, an adsorption area, an exchange area and a discharge area from top to bottom in the device body. The adsorption area is filled with activated carbon, and the exchange area is filled with resin; the first distribution plate is arranged between the feed area and the activated carbon adsorption area; the second distribution plate, the second distribution plate Set between the activated carbon adsorption zone and the resin exchange zone; the third distribution plate, the third distribution plate is set between the resin exchange zone and the discharge zone; the ammonium tungstate solution inlet, the The inlet of the ammonium tungstate solution is located in the feed area; the exhaust port is located in the feed area; the outlet of the purified ammonium tungstate solution is located in the outlet of the purified ammonium tungstate solution The discharge area. Using this equipment can obtain ultra-high-purity ammonium tungstate solution with a tungsten-molybdenum ratio greater than 50,000, which significantly improves the economic benefits of the enterprise.

Description

technical field [0001] The invention belongs to the field of tungsten smelting, in particular, the invention relates to equipment and methods for purifying ammonium tungstate solution. Background technique [0002] Tungsten and molybdenum are important strategic rare metals of the country and have a wide range of uses in industry. Tungsten and molybdenum belong to group VIB in the periodic table of elements. Due to the influence of "lanthanide contraction", the atomic radius, atomic structure and chemical properties of the two are very similar, which makes the separation process very difficult. In many associated tungsten and molybdenum element resources, tungsten and molybdenum exist in the same phase. At present, the general beneficiation method cannot effectively separate tungsten and molybdenum elements, and can only be processed by metallurgical processes. At present, the methods used in the patented technology of tungsten and molybdenum separation mainly include preci...

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Problems solved by technology

Usually because of the difference in the molar concentration ratio of tungsten and molybdenum in the initial tungstomolybdate mixed solution, the molar concentration ratio of tungsten and molybdenum in the solution after molybdenum removal can be within the range of 2500 to 12500. Technology has been unable to further reduce the molybdenum content in the solution, so the impurity purity of subsequent APT products is restricted; secondly, during the separation process of tungsten and molybdenum, the tiny particulate impurities in the solution have a certain probability to enter the solution after molybdenum removal, during the crystallization process Phenomena such as co-crystallization and agglomeration cause impurities in APT products to exceed the standard or contain impurity particles such as black spots, which has become a bottleneck for manufacturers to improve product quality

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