無機凝集劑로써 Kaolin 懸濁液 凝集에 있어서 Gelatine이 미치는 影響 = Influence of Gelatine on Coagulation of Kaolin Suspension by Inoriganic Coagulants

다국어 초록 (Multilingual Abstract)

An investigation was carried out to compare the coagulation effects of inorganic coagulants, gelatine, and inorganic coagulants with gelatine on coagulation of kaolin suspension. Inorganic coagulants used were Al_2(S0_4)_3, K-Alum, MgCI_2, CaC1_2, NaCl and KCl.
The results are as follows;
1) When the inorganic coagulants only is added to kaolin suspension,
i) The coagulation effect is superior to the other two cases.
ii) The coagulating power of the inorganic coagulants is ranked as follows;
Al_2(SO_4)_3> K-Alum CaCl_2>MgCl_2>KCl>NaCl
It is consistent with the studies of other investigators.
Also, coagulantion value decrease with increasing of molecular weight in the same ionic coagulants
iii) The coagulation values of inorganic coagulants containing counter-ions with charge numbers of 3.2 and 1 i.e. Al_2 (SO_4)_3, CaCl_2, and KC1 are in the ratio of;
1,227X10 exp (-3) : 1.135X10 exp (-2) : 3.646X10 exp (-1)
It is consistent with the D.L.V.0. theory and the Schulze & Hardy rule.
iv) Because of cationic antagonism between potassium ions and aluminium ions in kaolin suspension, the coagulating power of K-Alum is weaker than that of Al_2 (SO_4)_3.
2) When an inorganic coagulant with gelatine is added to kaolin suspension, the coagulation effect is poorer than that when the inorganic coagulant only is added. As the charge number of the inorganic coagulant increases the coagulation effect is also increased, but the magnitude of the increase is small.
3) When gelatine only is added to kaolin suspension, the coagulation effect is the worst among the three cases. Only over a narrow range of dilute gelatine concentration the coagulation occurs slightly.
4) A logarithmic relationship between the relative turbidity and the settling time is as follows;
log J_rel=-m log t+log ℃