| 多组分氯盐体系镁锂分离规律初探 |
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| 引用本文： | 刘香环,易美桂,向兰. 多组分氯盐体系镁锂分离规律初探[J]. 无机盐工业, 2019, 51(8): 13-16. DOI: 10.11962/1006-4990.2018-0556 |
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| 作者姓名： | 刘香环 易美桂 向兰 |
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| 作者单位： | 1.四川大学化学工程学院,四川成都 6100652.清华大学化学工程系 |
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| 基金项目： | 国家自然科学基金(51774191);山西省煤基重点科技攻关项目(MC2014-06) |
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| 摘 要： | 以Na2CO3为沉淀剂,初步研究了多组分氯盐混合体系(0.6molMgCl2+1.1molLiCl+3.2molNaCl)中选择性沉镁的工艺规律。结果表明:在25~80℃,总C与总Mg物质的量比[n(CT)/n(MgT)]为0.8~1.1时,25℃形成针状MgCO3·3H2O,40℃以上形成Mg5(CO3)4(OH)2·4H2O不规则片状团聚微球,其中40~50℃形成的片状物较为分散且粒径较小,导致固液分离困难。40℃时沉镁率最低。温度越高,Li2CO3越易形成,沉锂率越大。n(CT)/n(MgT)越大沉镁率和沉锂率越高。室温(25℃)、n(CT)/n(MgT)=1.0时,沉镁率达98%以上,且沉锂率<0.1%,镁锂分离效果最好。
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| 关 键 词： | 镁锂分离 混合氯盐 碳酸钠 |
| 收稿时间： | 2019-02-21 |
Preliminary study on separation of magnesium and lithium in multicomponent chloride salt system |
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| Liu Xianghuan,Yi Meigui,Xiang Lan. 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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| Authors: | Liu Xianghuan Yi Meigui Xiang Lan |
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| Affiliation: | 1. College of Chemical Engineering,Sichuan University,Chengdu 610065,China2. Department of Chemical Engineering,Tsinghua University |
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| Abstract: | 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. |
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| Keywords: | separation of magnesium and lithium mixing chloride salts Na2CO3 |
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