A New Production Method of Pure Ammonium Metatungstate

Using a coupling process of neutralization–nanofiltration–crystallization, pure  is producted . The effects of chemical neutralization of ammonium paratungstate (APT) by nitric acid, operating pressure, the concentration of AMT and the volume of washing water on the coupling process were systematically discussed. It was found that the better conditions of AMT

production were as follows: the neutralization temperature was 80°C–95°C, pH value was 2.0–3.5; the operation pressure of HDS-12-2 nanofiltration was 1.5–2.0 MPa, the density of AMT crystallization solution was 2.39 kg/L and then cooling. APT convert efficiency to AMT was more than 97.62%. The removal ratio of nitrate ion was more than 99% ,while AMT rejection (RAMT) was 99.9%. Besides, small-grained, even-proportioned, white-colored and high-purified AMT crystal was be obtained and analyzed. This method has several advantages such as simple technological process, short production cycle, lower environmental pollution and high quality.

 

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