Removal of Suspended Clays by Coagulation and Foam Separation Using Poly Aluminum Chloride and Milk Casein.

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  • ＰＡＣと乳製カゼインを用いた凝集・泡沫分離法によるカオリン懸濁粒子の除去
  • PAC ト ニュウセイ カゼイン オ モチイタ ギョウシュウ ホウマツ ブンリホウ ニ ヨル カオリン ケンダク リュウシ ノ ジョキョ

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Abstract

To clarify the treatability of kaolin suspension by coagulation and foam separation method using poly aluminum chloride (PAC) and milk casein (casein), the characteristics of pH, dosage of PAC and casein, operating conditions such as foam separation time and air flow rate, and effects of alkalinity were examined. The results obtained by this study can be summarized as follows.<br>(1) The conditions to treat the sample of 200mg·l-1 kaolin suspension containing 50mg·l-1 of NaHCO3 to under 2 turbidity units were obtained to be pH8.5-10, PAC 10mg-Al·l-1, casein 15mg·l-1, foam separation time of 5min, air flow rate of 0.2l·min-1.<br>(2) The sample of 50-1,000mg·l-1 kaolin suspension can be treated to under 2 turbidity units by controlling the dosages of PAC and casein.<br>(3) The requirement amount of casein was considered to be the sum of a portion of adsorbing onto the flocs as a collector and another portion of residual as a frother to remove flocs by coagulation and foam separation.<br>(4) Optimum pH range expanded to neutral side with NaHCO3 dosage increased. Optimum pH range for 200mg·l-1 kaolin suspension changed from 8.5-10 at 50mg-NaHCO3·l-1 to 7-10 at 150mg-NaHCO3·l-1.<br>(5) Optimum pH range was 6.5-9 for 200mg·l-1 kaolin suspension of tap-water.<br>From these results, it was clarified that the coagulation and foam separation using PAC and casein was very effective to remove suspended matters such as kaokin particles.

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