STUDIES ON IMPELLER TYPE, IMPELLER SPEED AND AIR-FLOW RATE IN AN INDUSTRIAL-SCALE FLOTATION CELL .1. EFFECT ON BUBBLE-SIZE DISTRIBUTION

被引：104

作者：

GORAIN, BK ^{[1
]}

FRANZIDIS, JP ^{[1
]}

MANLAPIG, EV ^{[1
]}

机构：

[1] UNIV CAPE TOWN,DEPT CHEM ENGN,CAPE TOWN,SOUTH AFRICA

来源：

MINERALS ENGINEERING | 1995年 / 8卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

INDUSTRIAL FLOTATION CELL; OUTOKUMPU IMPELLER; DORR-OLIVER IMPELLER; AGITAIR CHILE-X IMPELLER; AGITAIR PIPSA IMPELLER; BUBBLE SIZE DISTRIBUTION; AERATION RATE; IMPELLER SPEED;

D O I：

10.1016/0892-6875(95)00025-L

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Bubble size distributions were measured at different locations in a 2.8 m(3) portable industrial scale sub-aeration flotation cell, treating zinc cleaner feed in the Hellyer Concentrator in Tasmania, Australia The cell was fitted in rum with four different impeller-stator systems, and operated over a range of airflow rates and impeller speeds. The mean bubble size was found to increase with increase in airflow rate at different locations in the cell, for all four impellers, and to decrease with increase in impeller speed. The mean bubble size was largest close to the impeller shaft and smallest at the impeller discharge point for all the impellers.' The shape of the bubble size distribution also changed with location in the cell. The ''global mean'' bubble size calculated by simple arithmetic average of the values at sir locations in the cell coincided remarkably well with the mean bubble size measured halfway between the impeller shaft and the side of the cell, at the top of the pulp. In general, the impellers produced ''global mean'' values of 1.0 mm or less at the manufacturer's recommended impeller speed.

引用

页码：615 / 635

页数：21

共 14 条

[1]

Nevett, Some controlling factors in flotation, Proc. Aust. Inst. Min. Metall., pp. 55-72, (1920)

[2]

Bennet, Chapman, Dell, Froth flotation of coal, 3rd Int. Coal Prep. Conf., pp. 452-462, (1958)

[3]

Diaz-Penafiel, Dobby, Kinetic studies in flotation columns: bubble size effect, Minerals Engineering, 7, 4, pp. 465-478, (1994)

[4]

Dobby, Yianatos, Finch, Estimation of bubble diameter in flotation columns from drift flux analysis, Canadian Metallurgical Quarterly, 27, 2, pp. 85-90, (1988)

[5]

Randall, Goodall, Fairlamb, Dold, O'Connor, A method of measuring the sizes of bubbles in two and three phase systems, J. Phys. E: Sci. Instrum., 22, pp. 827-833, (1989)

[6]

Tucker, Deglon, Franzidis, Harris, O'Connor, An evaluation of a direct method of bubble size distribution measurement in a laboratory batch flotation cell, Minerals Engineering, 7, 5-6, pp. 667-680, (1994)

[7]

Richmond, Zinc-lead ore concentration by Aberfoyle Limited, Hellyer, Tasmania Australasian Institute of Mining and Metallurgy, The Sir Maurice Mawby Memorial Volume, 1, pp. 530-535, (1993)

[8]

Cochrane, Hydrodynamics in aerated stirred tank, Ph.D Thesis, (1986)

[9]

Vanderkruk, Comparison of bubble sizing techniques in a laboratory scale flotation cell, B.Sc.(Hons) Thesis, (1994)

[10]

Gorain, Franzidis, Manlapig, Studies on impeller type, impeller speed, and air flow rate in an industrial scale flotation cell. Part 2: Effect on gas hold-up and superficial gas velocity, Minerals Engineering, (1994)

← 1 2 →