Contribution to the lithium recovery from brine
Contribution to the lithium recovery from brine
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DOI：
10.1016/s0011-9164(03)00455-7
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发表时间：
2003-08
期刊：
影响因子：
9.9
通讯作者：
A. Hamzaoui;A. M’nif;H. Hammi;R. Rokbani
中科院分区：
文献类型：
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作者：
A. Hamzaoui;A. M’nif;H. Hammi;R. Rokbani
在盐水蒸发过程中，已确定 50% 的初始天然盐水锂保留在残余盐水中 [l]。这种现象归因于沉淀盐对锂的保留 [1, 2]。残留的盐水中含有高度浓缩的镁。因此从这种卤水中回收锂变得更加困难。事实上，镁以草酸盐或碳酸盐形式沉淀降低了盐水中的镁浓度，并且使得锂提取更容易。草酸盐和碳酸盐分别在 500°C 和 900°C 下煅烧可产生用作耐火产品的氧化镁 (MgO)。本研究表明，合成盐水中的镁含量受到以下因素的影响：a) 试剂比例与镁浓度的函数关系； b) 反应持续时间； c) 反应温度。通过这项工作，我们证明了锂保留取决于草酸镁形成的同素异形体（α或β）。当镁以碳酸盐形式沉淀时，当CO3/MG摩尔比大于0.91时，所有锂保留在溶液中。
During the brine evaporation it has been determined that 50% of the initial natural brine lithium remains in the residual brine [l]. This phenomenon has been attributed to the retention of lithium by the precipitated salts [1, 2]. The residual brine is highly concentrated with magnesium. Therefore the lithium recovery from this kind of brine becomes more difficult. Indeed the magnesium precipitation as an oxalate or a carbonate decreases the brine magnesium concentration and makes easier the lithium extraction. The calcinations of the oxalate and the carbonate, respectively at 500°C and 900°C produces the magnesia (MgO) which is used as a refractory product. The present study shows that the magnesium rate, in synthetic brines, has been influenced by the following factors: a) the reagents ratio as a function of magnesium concentration; b) the reaction duration; and c) the reaction temperature. By this work we have proved that the lithium retention depends on the formed allotropic variety (α or β) of the magnesium oxalate. When magnesium had been precipitated as a carbonate, all the lithium remained in the solution when the molar ratio CO3/MG was superior to 0.91.