Sodium bentonite additive and preparation method thereof
A technology of sodium bentonite and additives, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of insufficient sodiumization effect and uneven sodiumization.
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[0019] The present invention also provides a preparation method of a sodium-based bentonite additive, comprising: mixing microcrystalline cellulose, sodium-salt-modified silica gel, expanded vermiculite, ammonium borate, a tackifier and polyacrylamide;
[0020] Wherein, the sodium salt is selected from sodium carbonate, sodium silicate, sodium fluoride, sodium oxalate, sodium acetate, sodium phosphate, sodium polyacrylate, sodium hydroxide, sodium chloride, sodium thiosulfate and sodium cellulose One or more; the tackifier is selected from magnesium oxide and / or magnesium hydroxide.
[0021] In the above method, the particle diameter of the silica gel modified by expanded vermiculite and sodium salt can also be selected in a wide range, but in order to make the particle diameter of the silica gel modified by expanded vermiculite and sodium salt can fully contact with calcium-based bentonite to improve For the sodiumization effect of the prepared additive, preferably, the parti...
Embodiment 1
[0029] 1) At 60°C, soak the silica gel in an aqueous solution of sodium carbonate (containing 25-30% by weight of sodium carbonate) for 3.5h, and then filter to obtain a sodium-salt-modified silica gel (measured by weighing method). contains 8% by weight of sodium carbonate);
[0030] 2) Mix microcrystalline cellulose, sodium salt modified silica gel (300 mesh in particle size), expanded vermiculite (300 mesh in particle size), ammonium borate, magnesium oxide and polyacrylamide (7 million weight average molecular weight) A sodium-based bentonite additive A1 is prepared; wherein, the weight ratio of sodium salt-modified silica gel, microcrystalline cellulose, expanded vermiculite, ammonium borate, magnesium oxide and polyacrylamide is 100:8:50:6:4:5.
Embodiment 2
[0032] 1) Soak the silica gel in an aqueous sodium carbonate solution (containing 25% by weight of sodium carbonate) for 3 hours at 50° C., and then filter to obtain a sodium-salt-modified silica gel (the silica gel modified by sodium salt contains 5 % by weight of sodium carbonate);
[0033] 2) Mix microcrystalline cellulose, sodium salt-modified silica gel (300 mesh in particle size), expanded vermiculite (300 mesh in particle size), ammonium borate, magnesium oxide and polyacrylamide (4 million weight average molecular weight) A sodium-based bentonite additive A2 is prepared; wherein, the weight ratio of sodium salt-modified silica gel, microcrystalline cellulose, expanded vermiculite, ammonium borate, magnesium oxide and polyacrylamide is 100:5:40:3:1:2.
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