Method for increasing hydrogenation efficiency of lithium carbonate
A technology of hydrogenation efficiency and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low reaction efficiency, long reaction time, poor mass transfer and absorption, etc. The effect of shortening the hydrogenation reaction time
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Embodiment 1
[0039] Take 1 kg of lithium carbonate crude product (purity: 98.5%), prepare lithium carbonate slurry according to the liquid-solid ratio of 20:1, pump the slurry into the ultrasonic hydrogenation kettle, and set the ultrasonic intensity to 10W / cm 2 , into CO 2 The gas flow rate is 0.66m 3 / h, each ultrasonic treatment time (corresponding to the time of a single ultrasonic stage) is 10min, the interval between two adjacent ultrasonic waves is 5min, the hydrogenation reaction is 30min, and the ultrasonic frequency is 20kHz. The hydrogenation conversion rate of lithium carbonate was 95.6%. Under the condition of 90-95° C., the obtained lithium bicarbonate was pyrolyzed for 2 hours to obtain lithium carbonate with a purity of 99.7%.
Embodiment 2～6
[0041] Hydrogenation was carried out in the manner of Example 1, except that the ultrasonic frequency was different. The specific parameters and test results can be seen in Table 1.
[0042] Table 1 Embodiment 1~6 hydrogenation reaction parameter, conversion rate and the purity of pyrolysis product
[0043] Example
[0044] From the test results in Table 1, it can be seen that the ultrasonic frequency has an influence on the hydrogenation reaction. Under the same conditions, when the ultrasonic frequency is 60 kHz, the hydrogenation conversion rate reaches the highest, which is 99.1%.
Embodiment 7
[0046] Get 5kg lithium carbonate crude product (purity: 98.5%), be mixed with lithium carbonate slurry by liquid-solid ratio 20:1, the slurry is squeezed in the ultrasonic hydrogenation kettle by pump, open mechanical stirring, ultrasonic frequency is set to 60kHz, pass Into CO 2 The gas flow rate is 3.3m 3 / h, each ultrasonic treatment time is 10min, the interval between two adjacent ultrasonic waves is 5min, the hydrogenation reaction is 30min, and the ultrasonic intensity is 10W / cm 2 , the hydrogenation conversion rate of lithium carbonate is 93.6%; the purity of lithium carbonate obtained after pyrolysis is 99.6%.
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