FLUIDIZATION OF A MINERAL CONCENTRATE AT REDUCED PRESSURE

被引：23

作者：

WRAITH, AE

HARRIS, R

机构：

[1] Materials Division, Department Mechanical, Materials and Manufacturing Engineering

[2] Department Mining and Metallurgical Engineering, McGill University, Montréal

来源：

MINERALS ENGINEERING | 1992年 / 5卷 / 09期

关键词：

VACUUM FLUIDIZATION; CONCENTRATES TREATMENT; ELUTRIATION;

D O I：

10.1016/0892-6875(92)90126-T

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The behaviour of relatively deep beds of a spodumene concentrate air-fluidised at reduced pressure has been investigated at room temperature in a cylindrical column 5.72 cm bore over a range of top-pressure between 67 and 400 Pa absolute. These conditions gave a bed pressure drop for complete fluidisation at least an order of magnitude larger than the top pressure. A fluidisation front was seen to extend downwards through the bed with increasing gas flow rate. In this intermediate fluidisation regime, increasing gas velocity along the pressure gradient produces a range of behaviour within a bed that extends from settled conditions at the base towards slugging at the top. The increasing gas velocity creates a strong differential elutriation which was accompanied by a shift in the minimum fluidisation velocity as the mean bed particle size increased. Metallurgical applications and operational effects are considered.

引用

页码：993 / 1002

页数：10

共 8 条

[1]

Pidgeon, Alexander, Thermal production of magnesium — pilot plant studies on the retort ferrosilicon process, Trans AIME, 159, (1944)

[2]

Humbert, Blossey, Vacuumm technology in steel: ladle and circulation vacuum systems, Proc. The Elliott Symposium, 427, (1990)

[3]

Kunii, Levenspiel, Fluidization Engineering, (1969)

[4]

Kawamura, Suezawa, The flow of gas in a fluidised bed at low pressure, Chemical engineering, 25, (1961)

[5]

Kusakabe, Kuriyama, Morooka, Fluidization of fine particles at reduced pressure, Powder Technology, 58, (1989)

[6]

Ergun, Fluid flow through packed columns, Chem Eng Prog., 48, (1952)

[7]

Szekely, Themelis, Rate Phenomena in Process Metallurgy, (1971)

[8]

Dushman, Scientific Foundations of Vacuum Technique, (1949)

← 1 →