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Refining of crude Li2CO3 via slurry phase dissolution using CO2

机译：使用CO2通过淤浆相溶解精制粗制Li2CO3

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摘要

Refining of crude Li2CO3 produced from salt lake brines of Qinghai,China,by direct carbonation with CO2-water solutions under different conditions was studied.The process is based on the reaction of Li2CO3 with CO2-water solutions to convert the former to the more soluble lithium bicarbonate.The carbonation experiments were carried out in a three-phase mechanically agitated slurry-bed reactor.The parameters that may affect the dissolution of Li2CO3 in CO2-water solution such as CO2 pressure,temperature,CO2 flow rate,solid concentration,particle size of Li2CO3,slurry filling degree,agitator shape and agitation speed were investigated.The effects of immersion time of Li2CO3 in the slurry before carbonation as well as multiple carbonation cycles were also examined.It was found that the rate of dissolution of Li2CO3 increased with increasing CO2 pressure inside the reactor,agitation speed or CO2 flow rate.Furthermore,it increased with decreasing Li2CO3 particle size,slurry filling degree,reaction temperature or solid concentration.The immersion time had almost no effect on the carbonation ratio of Li2CO3.By multiple carbonations,it was possible to convert all of the insoluble Li2CO3 to lithium bicarbonate.The kinetics of the carbonation process in determined time intervals can be properly represented by 1 - (1-X)~(1/2)=kt.Finally,the Arrhenius activation energy of the carbonation reaction was obtained by calculation.
机译：研究了在不同条件下用CO2水溶液直接碳化制得的青海盐湖卤水产生的粗制Li2CO3。该工艺基于Li2CO3与CO2水溶液的反应，将前者转化为更易溶的碳酸氢锂。在三相机械搅拌浆床反应器中进行碳酸化实验。可能影响Li2CO3在CO2水溶液中溶解的参数如CO2压力，温度，CO2流量，固体浓度，颗粒研究了碳酸锂的大小，浆液的填充度，搅拌器的形状和搅拌速度。研究了碳酸锂在碳酸化前在水泥浆中的浸入时间以及多次碳酸化循环的影响，发现碳酸锂的溶解速率随着增加反应器内的CO2压力，搅拌速度或CO2流量。此外，随着Li2CO3粒径，浆料填充度，r浸泡时间对Li2CO3的碳酸化率几乎没有影响。通过多次碳酸化，有可能将所有不溶性Li2CO3转化为碳酸氢锂。用1-（1-X）〜（1/2）= kt表示。最后，通过计算得到碳酸化反应的阿累尼乌斯活化能。

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