铝酸钠溶液中草酸钙的行为（英文）

发布时间：2018-05-06 16:57

本文选题：草酸钙 + 铝酸钠溶液　；参考：《Transactions of Nonferrous Metals Society of China》2017年08期

【摘要】：草酸钙的稳定性对于铝酸钠溶液中草酸钠的脱除至关重要。研究了草酸钙在含有碳酸钠的铝酸钠溶液中的反应行为。结果表明,在铝酸钠溶液和碳酸钠溶液中,草酸钙能够分别被转化为铝酸三钙(TCA)和碳酸钙。在铝酸钠溶液中,升高温度、延长反应时间以及增加苛性碱浓度会使得草酸钙的转化率增加,进而发生反苛化反应。此外,含钙化合物的稳定性在含有碳酸钠的铝酸钠溶液中与其在单一的铝酸钠或者碳酸钠溶液中不同。铝酸钠溶液中的碳酸钠会促进草酸钙的转化,因此4CaO·Al_2O_3·CO_2·11H_2O和TCA的形成会导致氧化铝的损失。在铝酸钠溶液中,温度升高会促进碳酸钙、4CaO·Al_2O_3·CO_2·11H_2O和草酸钙转化为TCA。在低温稀铝酸钠溶液中,短停留时间操作条件下,草酸钙可以保持相对稳定。研究的新型石灰苛化去除草酸钠工艺已经应用于国内某氧化铝厂。
[Abstract]:The stability of calcium oxalate is very important for the removal of sodium oxalate from sodium aluminate solution. The reaction behavior of calcium oxalate in sodium aluminate solution containing sodium carbonate was studied. The results show that calcium oxalate can be transformed into TCA and calcium carbonate in sodium aluminate solution and sodium carbonate solution respectively. In sodium aluminate solution, the conversion rate of calcium oxalate is increased by increasing the temperature, prolonging the reaction time and increasing the concentration of caustic soda. In addition, the stability of calcium compounds in sodium aluminate solution containing sodium carbonate is different from that in a single sodium aluminate or sodium carbonate solution. Sodium carbonate in sodium aluminate solution can promote the conversion of calcium oxalate, so the formation of 4CaO Al_2O_3 CO_2 11H_2O and TCA will lead to the loss of alumina. In sodium aluminate solution, the increase of temperature can promote the conversion of calcium carbonate 4CaO Al_2O_3 CO_2 11H_2O and calcium oxalate to TCA. In low temperature dilute sodium aluminate solution, calcium oxalate remained relatively stable under the condition of short residence time. The new lime caustic removal process for sodium oxalate has been applied to an alumina plant in China.
【作者单位】：中南大学冶金与环境学院;
【基金】：Project(51274242) supported by the National Natural Science Foundation of China Project(2015CX001) supported by the Innovation-driven Plan of Central South University,China
【分类号】：O643.1;TQ133.1

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