Influence of Metal Cation and Flocculant on the Settlement of Kaolinite
Aiming at the difficulty of fine kaolinite settling in tailings water,common metal cations(Na+,K+,Ca2+and Mg2+)in tailings water were used as coagulants,and polyacrylamide(CPAM)was used as flocculants to conduct flocculation tests after coagulation.The results showed that under the condition of neutral pH,pulp concentration of 30 g/L,optimal concentration of K+being 0.6 mol/L,optimal concentration of Ca2+being 0.08 mol/L,and the dosage of CPAM was 30 mg/L,the settling effect was the best.zeta potential test,FTIR test and contact angle test were used to reveal the action mechanism of metal cations.Compared with univalent ions,bivalent ions have a better effect.Bivalent ions can significantly reduce the absolute value of zeta potential on the surface of particles,reduce the hydroxyl functional groups on the surface of particles,and increase the hydrophobicity of the surface of particles.CPAM can significantly improve the sedimentation rate,but it will lead to higher turbidity.When the metal cation is combined with CPAM,the sedimentation rate and the turbidity of the superliquid show better effects.
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