木虫 (正式写手)
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高兴星期五(金币+30, 翻译EPI+1): 2010-05-26 17:16:45
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In view of this situation, we propose to use ammonium bicarbonate (NH4HCO3) and ammonia (NH3 • H2O) on the Baotou rare earth mineral ore for sulfuric acid roasting metathesis treatment, the treated extract by evaporation and crystallization process into the (NH4) 2SO4 products cake for acid leaching, impurity removal, based on the precipitation of calcium and rare earth elements of different pH values, by fractional precipitation of calcium and rare earth elements were isolated, then the form of calcium to calcium, rare earth rare earth hydroxide the form of objects, the rare earth hydroxide dissolved by hydrochloric acid and rare earth chloride solution can be transformed so that it can achieve the recovery of calcium and rare earth elements. In addition, the experimental process of water recycling can be reused. |
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