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    Reaming of silica gel

    • Last Update: 2022-01-04
    • Source: Internet
    • Author: User
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    Reaming of silica gel

    The preparation methods of special silica gel suitable for different purposes are also different
    .
    When preparing ultra-coarse pore silica gel, generally fine pore silica gel is used as the raw material, and the pores are enlarged by 1 to 2 orders of magnitude through proper pore expansion methods

    .
    Here are two methods of reaming

    .

    (1) Reaming with high pressure steam

    Put silica gel and distilled water in the autoclave, and then heat to the required pressure for a certain period of time.
    After washing and drying, the expanded silica gel can be obtained, see Table 4-26

    .

    Table 4-26 The effect of high-pressure steam treatment on the pore structure of silica gel

    Salt solution can also be used to replace distilled water when expanding the hole with high-pressure steam, which can reduce the pressure and shorten the time
    .

    (2) Roasting and expanding with salt

    A certain amount of silica gel is mixed with a certain concentration of salt solution, first dried at a low temperature, then calcined at a high temperature, washed and dried to obtain a pore-expanded silica gel
    .
    Table 4-27 shows the parameters of certain silica gel obtained after soaking silica gel in LiCl·H
    2 O—NaCl-KNO 3 ternary double salt and calcining at different temperatures for 2 hours
    .

    Table 4-27 The effect of salt roasting treatment on the pore structure of silica gel

    Related links: Physicochemical properties and preparation methods of silica gel

     

     

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