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通过在线测定种分过程铝酸钠溶液的电导率,计算种分过程中组分的活度和缔合度,研究铝酸钠溶液的种分机理。结果表明:浆液电导率随着氢氧化铝含量增加呈线性降低;种分初期60 min内浆液电导率和铝酸钠溶液和浆液电导率的差值均显著降低,然后随种分的进行而显著升高,但在10 h后电导率增大幅度变小。低浓度溶液中Na OH和Na Al(OH)4活度较高,有利于种分,使溶液和浆液间电导率差值增大;且种分初期溶液中离子对多,有利于Na+Al(OH)4-吸附在晶种表面,导致溶液中生成离子对的平衡被打破,从而使电导率差值减小。
The on-line determination of electrical conductivity of the sodium aluminate solution during the seed-setting process was used to calculate the activity and the degree of association of the components in the seed-setting process and to study the seed-partitioning mechanism of the sodium aluminate solution. The results showed that the conductivity of the slurry decreased linearly with the increase of the content of aluminum hydroxide. The difference of the conductivity of the slurry and the conductivity of the sodium aluminate solution and the slurry was significantly decreased within 60 min after seed germination, Increased, but the increase of conductivity decreased after 10 h. The higher concentration of NaOH and NaAl (OH) 4 in low concentration solution is conducive to seed differentiation, which increases the conductivity difference between the solution and the slurry; and the ion pairs are more in initial solution, which is in favor of Na + Al (OH) 4-adsorbed on the surface of the seed crystal, resulting in the equilibrium of ion pairs generated in the solution being broken, thereby reducing the difference in conductivity.