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The hydrogenation reaction optimization in addition to calcium and magnesium in the preparation of high purity lithium carbonate

Author: DaiZhiFeng
Tutor: MaPeiHua
School: Institute of Qinghai Salt Lake
Course: Inorganic Chemistry
Keywords: High purity Li2CO3 Hydrogenation reaction An ion exchange resin Preparation
CLC: TQ131.1
Type: Master's thesis
Year: 2005
Downloads: 503
Quote: 2
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Abstract


Li 2 CO 3 as the main raw material for the preparation of other lithium salt, is an important basic lithium salt. Early Li 2 CO 3 is mainly used in aluminum smelting, glass and ceramics in. In recent years, high purity Li 2 the CO 3 Applications and more widely, not only used in lithium-ion battery cathode material, electrolyte materials for surface elastic wave The device material of lithium tantalate (TL), a single crystal of lithium niobate (NL). This article summarizes Li 2 CO 3 nature Li 2 CO 3 applications and production technology , high purity Li 2 CO 3 Preparation. On this basis, the main process and mechanism of the hydrogenation reaction, CO 2 the impact of the flow of gas for the hydrogenation reaction and CO 2 gas flow control. And the hydrogenated liquid PUROLITE S-940 resin addition to the of Ca 2 the the Mg 2 impurity in the process of detailed study and discussion, at the same time the high purity of Li < sub> 2 CO 3 samples. The optimum conditions: 1.Li 2 CO 3 hydrogenation reaction prevail a reaction, its speed control steps the CO 2 The dissolution of the gas and Li , CO 2 3 solid mass transfer process. Gas 2.CO 2 flow rate of the hydrogenation reaction, the hydrogenation efficiency have a greater impact. The experiments show that, when the the hydrogenation temperature at 20 ° C, the hydrogenation reaction time in 90min, CO 2 gas flow per unit time control enables hydrogenation in 2.667 L · min -1 the reaction rate reaches a maximum, hydrogenated highest efficiency. Profit the of Ca 2 Mg 2 impurities, measured in a dynamic method ion exchange with PUROLITE S-940 ion exchange resin treatment hydrogenated liquid exchange capacity of the maximum working 23.363g Ca · L -1 resin, maximum working exchange capacity, measured by the static method 21.387g Ca · L -1 resin. 4 the hydrogenated liquid Ca 2 , Mg 2 concentration and flowing through the ion exchange column when the flow rate is an important factor affecting the exchange capacity of the resin work. Experiment measured the hydrogenation solution Ca 2 the concentration of Mg 2 in 25.1796mg · L -1 and 16.8764 mg · L - about 1 , flow rate control 15BV · h -1 about the exchange rate and the exchange capacity maximum. 5.PUROLITE S-940 resin regeneration using dynamic cocurrent regeneration, resin was able to quickly and effectively to restore its performance. Will remove Ca 2 the the Mg 2 and B LiHCO 3 solution heated vapor deposition obtained the of Li 2 CO 3 products. After testing Li 2 the CO 3 the impurity content in the products meet the high purity the of Li 2 the CO 3 national standard GB10576-89 requirements, the main content of more than 99.9%.

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CLC: > Industrial Technology > Chemical Industry > Inorganic compounds, the chemical industry of the metal elements > First Ⅰ group metal elements of inorganic compounds > Inorganic compounds of the alkali metal ( Ⅰ A family ) elements
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