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Preliminary study on separation of magnesium and lithium in multicomponent chloride salt system
Received date: 2019-02-21
Online published: 2020-06-15
The process of selective precipitation of Mg2+ from multicomponent chloride salt mixed system(0.6 mol MgCl2+1.1 mol LiCl+3.2 mol NaCl) was preliminarily studied with Na2CO3 as precipitate agent.The results indicated that at 25~80 ℃ and the amount-of-substance ratio of total C and total Mg[n(CT)/n(MgT)] was 0.8~1.1,the MgCO3·3H2O needle-like particles formed at 25 ℃ and the irregular spherical agglomerates composed of sheet-like Mg5(CO3)4(OH)2·4H2O were obtained above 40 ℃.The precipitates formed at 40~50 ℃ were comparatively difficult to be separated by filtration due to the relative dispersion and the small particle sizes.The precipitation ratio of Mg2+ was the lowest at 40 ℃.The higher the temperature,the easier the formation of Li2CO3 and the higher the ratio of Li+ precipitation.The increase of n(CT)/n(MgT) promoted both the precipitation of Mg 2+ and Li+.At room temperature(25 ℃) and n(CT)/n(MgT)=1.0,the precipitation ratio of Mg 2+ was above 98% and the precipitation ratio of Li+ was less than 0.1%,the separation effect of Mg2+ and Li+ was the best.
Xianghuan Liu , Meigui Yi , Lan Xiang . Preliminary study on separation of magnesium and lithium in multicomponent chloride salt system[J]. Inorganic Chemicals Industry, 2019 , 51(8) : 13 -16 . DOI: 10.11962/1006-4990.2018-0556
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