Demonstration of the conditions conducive to agglomeration of zinc calcine in fluidized bed roasters

被引:3
作者
Constantineau, J. Pierre [2 ]
Bouffard, Sylvie C. [1 ]
Grace, John R. [3 ]
Richards, Greg G. [4 ]
Lim, C. Jim [3 ]
机构
[1] BHP Billiton Nickel W, Prod Qual & Hydromet, Perth, WA 6000, Australia
[2] Matrikon Inc, Richmond, BC V6X 2W8, Canada
[3] Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T 1Z3, Canada
[4] Teck Resources Ltd, Appl Res & Technol Grp, Trail, BC V1R 4L8, Canada
关键词
Zinc sulphide; Fluidized bed; Roasting; Agglomeration; Temperature; Oxygen content; PARTICLE GROWTH MECHANISMS; BASIC LEAD SULFATES; GRANULATION;
D O I
10.1016/j.mineng.2011.06.002
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Agglomeration in the fluidized bed roasting of zinc sulphide concentrate was investigated in a continuous pilot-scale fluidized bed roaster. Alone or together, low stoichiometric excess oxygen (<10%) and high temperature (>940 degrees C) contributed most significantly to agglomeration of zinc calcine particles. Only one test - with 0% excess oxygen at 940 degrees C - led to severe agglomeration and subsequent defluidisation. Neither large initial particle size nor low gas superficial velocity promoted agglomeration as much as the combination of low stoichiometric excess oxygen and high temperature. Lead sulphide, a common impurity in zinc sulphide concentrate, also appeared to have played a key role in agglomeration. Both low excess oxygen and high temperature favoured a high partial pressure of sublimated lead sulphide. Upon contact with oxygen, lead sulphide oxidised to lead oxide, which then precipitated as a liquid onto the rather inert bed particles. As a liquid, lead oxide formed coatings that caused small particles to adhere to larger ones, as well as liquid bridges that bound particles together. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1409 / 1420
页数:12
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