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Concentrating rare earth elements to phosphate in molten coal ash by a temperature gradient approach
International Journal of Coal Geology ( IF 5.6 ) Pub Date : 2021-01-11 , DOI: 10.1016/j.coal.2021.103688
Jack Widmer , Jinichiro Nakano , Anna Nakano , James Bennett

Synthetic coal ash bearing 560 ppm europium oxide, blended with aluminum phosphate, was heat treated above its melting temperature and crystal evolutions with respect to europium concentration under controlled cooling were studied. The sample in a boat crucible was subjected to a temperature gradient of 100 °C across it to cause zone refining effects on crystallization behaviors in the melt (slag). Post analysis found six mineral phases formed from the melt while europium was only present in calcium phosphate, implying the majority of europium was segregated to the calcium phosphate. Europium concentrations in the calcium phosphate phase tended to be higher at zones with higher temperatures: as high as 7200 ppm, a 13-fold increase from the initial concentration.



中文翻译:

通过温度梯度法将稀土元素浓缩为煤灰中的磷酸盐

将掺有560 ppm氧化oxide的合成煤灰与磷酸铝混合,在高于其熔点的温度下进行热处理,并研究了在受控冷却下相对于crystal浓度的晶体演变。船形坩埚中的样品在整个样品上经受100°C的温度梯度,从而对熔体(矿渣)的结​​晶行为产生区域细化作用。后期分析发现,熔体中形成了六个矿物相,而phosphate仅存在于磷酸钙中,这意味着大部分of被分离为磷酸钙。在温度较高的区域,磷酸钙相中的concentrations浓度趋于更高:高达7200 ppm,比初始浓度增加13倍。

更新日期:2021-01-12
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