Extracting Ammonium Maratungstate by Neutralization

Neutralization with PAT and nitrate as raw material provisioning metatungstate: ammonium paratungstate deionized water and slurry containing ammonium citrate dubbed WO312% ~ 30% concentration. Press paratungstate: nitric acid = 1:20 3% to 5% dilute nitric acid to ammonium paratungstate slurry, controling solid-liquid ratio of 1: (3 ~ 4), Ph value rang from 2 to 4, dissolved by heating, and the solution relative density about 1.18 ~ 1.20, heated to 80 ~ 90 ℃, constant temperature and volume control Ph value, the reaction was stirred for 4h, aged for several hours, the supernatant was concentrated to a WO3 content of about 50%, insoluble was filtered off, the supernatant concentration was continued, cooling and crystallization, to 80 ℃ drying system.

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