A Research on the Treatment of Complex Sulphide Ores. IV : Selective Flotation of Sulphatization Residue

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In this report, the recoveries with selective flotation of chalcopyrite, pyrite and lead sulphate from the sulphatization residue of the bulk sulphide concentrate from the Hanaoka mine were dealt with. The advantage of the process combining flotation with sulphatization, from the standpoint of flotation, may be considered to be as follows : (a) The liberation of minerals will be promoted chemically, (b) the surface of mineral grains will be cleaned, and (c) the separation of minerals in the residue will be easier than that in the original ore. The samples of sulphatization residue containing 4.3 to 5.7% Cu, 14.5 to 20.0% Fe, 6.2 to 13.9% Pb, and 2.3 to 3.2% Zn, and of -150-mesh size, were subjected to tests. The main problems in the selective flotation were the floatability of lead sulphate produced by sulphatization and the degree of regrinding necessary for the liberation of chalcopyrite from pyrite. It was verified experimentally that the chemically pure lead sulphate was depressed at the pH of below 5.8 or above 6.2 when Aerofloat No. 25 was used as a collector and was floated at the pH of 8 to 9 when it was sulphidized with the predetermined quantity of sodium sulphide and potassium amyl xanthate was used as a collector. The sulphatization temperature suitable for the separation of chalcopyrite and pyrite from lead sulphate from the standpoint of flotation was found to be 160゜ to 170℃ in the temperature range of 1.30° to 170℃. In the separation of chalcopyrite and pyrite from lead sulphate, the recoveries were 92.9% for Cu and 96.2% for Fe and the rejection was 83.5% for Pb with 0.1 kg/t of white camphor oil and 0.13 kg/t of Aerofloat No. 25 and at the pH of 6. In the recovery of lead sulphate, the lead concentrate containing 36.7% Pb was obtained with the Pb recovery of 89.8% with 30 kg/t of sodium sulphide, 0.6 kg/t of white camphor oil and 1.0 kg/t of potassium amyl xanthate and at the pH of 9.2. In the separation of chalcopyrite from pyrite, three stages of regrinding, one stage of roughing and two stages of scavenging were required to obtain the copper concentrate of 9.9% Cu with the Cu recovery of 95.2% and the pyrite concentrate of 41.4% Fe with the Fe recovery of 61.4% with 0.7 kg/t of white camphor oil, 0.8 kg/t of Aerofloat No. 25 and 60 kg/t of slaked lime and at the pH of 10, 6. The size of the flotation products was very minute when microscopically examined, namely, the bulk of -20 micron material was 72.5% for the copper concentrate, 74.8% for the lead concentrate, 40.2% for the pyrite concentrate, and 16.7% for the tailing. The highest grade of concentrates obtained was relatively low, namely, 49.2% Pb for the lead concentrate, 11.7% Cu for the copper concentrate, and 41.4% Fe for the pyrite concentrate. It was, however, considered that a higher grade could not be obtained, because the degree of grinding of the sample was near the limit in flotation. The overall recoveries in the selective sulphatization and flotation were 97% for zinc, 90% for copper, 77% for lead, and 58% for iron.
東北大学の論文

A Research on the Treatment of Complex Sulphide Ores. IV : Selective Flotation of Sulphatization Residue

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