<報文>メルカプトベンゾチアゾールによる廃水中の重金属イオンの浮選除去

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Removal of cupric, cadmium and lead ions, the concentration of which being relatively low, from an artificially prepared waste water containing a large amount of zinc and ferrous ions was investigated by the technique of flotation using mercaptobenzothiazole (MBT) as a selective precipitant. The dissociation constant of MBT and the solubility products of cupric, cadmium, lead and zinc salts of MBT were also determined by acid titration and EMF methods, respectively. The results obtained are summarized as follows : 1) Acid dissociation constant of MBT is 9.8×10^<-8> ; also aqueous solution of MBT is quite stable in a wide pH region. 2) Solubility products of cupric, cadmium, lead and zinc salts of MBT are 5.2×10^<-22>, 1.7×10^<-15>, 8.6×10^<-16> and 1.6×10^<-11>, respectively. 3) More than 95% of cupric ion can be removed from the artificial waste water containing 10 mg/l of cupric, 100 mg/l of zinc and 500 mg/l of ferrous ions, by the addition of 1.5 equivalent of MBT to cupric ion, in a limited region of 4 to 5 of pH. 4) It is difficult to reduce the cadmium and lead ion concentration below the respective effluent standard values (0.1 mg/l and 1 mg/l) from the artificial waste water containing 10 mg/l of cadmium or of lead ion, 100 mg/l of zinc and 500 mg/l of ferrous ions, by the flotation using MBT.
東北大学の論文
1976-03-30