Interfacial phenomena in the sulfur-polytetrafluoroethylene system under hydrothermal conditions

被引：8

作者：

Mathew, Reuben J. ^{[1
]}

Papangelakis, Vladimiros G. ^{[2
]}

Guerra, Eduard ^{[1
]}

机构：

[1] Laurentian Univ, Sch Engn, Sudbury, ON P3E 2C6, Canada

[2] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada

来源：

MINERALS ENGINEERING | 2010年 / 23卷 / 14期

基金：

加拿大创新基金会;

关键词：

Sulphide ores; Fine particle processing; Leaching; Hydrometallurgy; Surface modification; LIQUID SULFUR; PRESSURE OXIDATION;

D O I：

10.1016/j.mineng.2010.07.004

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Sulfur occlusion of pyrite particles during oxidative pressure leaching of mineral sulfide concentrates at temperatures below 160 degrees C has a deleterious effect on pyrite oxidation kinetics. Existing techniques in mitigating sulfur occlusion involve the use of surfactants or operation at temperatures above 160 degrees C which are a burden to the process economy. This study looks at the suitability of polytetrafluoroethylene (PTFE) to act as a solid sorbent for the liquid sulfur generated during the pressure leach process. The suitability of PTFE as a solid sorbent was determined by comparing interfacial phenomena in the corresponding sulfur-PTFE-leach and sulfur-mineral-leach systems. The work of adhesion in a sulfur-PTFE system was calculated using the interfacial tension and contact angle measured in the relevant sulfur-PTFE system, which is comparable to published values in the pyrite-sulfur system. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1113 / 1119

页数：7

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