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release time:2023-08-03 Hits: Popular:AG11 battery
The above prepared active silicic acid aqueous solution and Lithium hydroxide powder (or aqueous solution) are mixed at a certain ratio at 0~80 ℃ (close to normal temperature) and stirred for 10 minutes to 2 hours to obtain a transparent and stable lithium silicate aqueous solution. The raw material ratio is: active silicic acid aqueous solution and Lithium hydroxide powder (or aqueous solution), preferably with the molar ratio of SiO2: Li2O between 2.5 and 10. When the molar ratio is lower than 2.2, white precipitates with chemical composition of Li2O · 2SiO2 or 2Li2O · SiO2 are easily formed during the reaction, which cannot maintain the stability of the aqueous solution for the reaction; If the molar ratio is greater than 10, the long-term stability of the lithium silicate aqueous solution obtained from the reaction is low at high temperatures, and the actual use effect is not good.
The mixing method of the two raw materials adopts adding Lithium hydroxide into the active silicic acid aqueous solution under stirring; Either active silicic acid aqueous solution is added to Lithium hydroxide, or both are added at the same time.
Then, the prepared dilute lithium silicate aqueous solution is evaporated and concentrated at 25-90 ℃ under normal pressure or reduced pressure to obtain a practical concentration of lithium silicate aqueous solution with a SiO2 content of less than 35% (usually 10-25%) by weight. Such a product, with finely dispersed silica particles, not only has the properties of a true solution, but also has good long-term storage stability.
According to literature reports, the lithium silicate trial production team of Tianjin Institute of Chemical Technology, Ministry of Chemical Industry of China, has comprehensively analyzed and compared various methods published abroad. After repeated experiments, a unique manufacturing process route has been developed, which is the room temperature and atmospheric pressure reaction method. Its advantages can utilize cheap raw materials, simple equipment, room temperature and atmospheric pressure reaction, and directly produce high concentration and high modulus lithium silicate aqueous solution
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