期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 582, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.123888
关键词
Scheelite; HEDP; Selective depressant; Flotation separation
资金
- Natural Science Foundation of China [51374247, 51634009]
- Innovation Driven Plan of Central South University [2015CX005]
- Key Laboratory of Hunan Province for Clean and Efficient Utilisation of Strategic Calcium-containing Mineral Resources [2018TP1002]
- National 111 Project [B14034]
- Collaborative Innovation Center for Clean and Efficient Utilisation of Strategic Metal Mineral Resources
A selective organic depressant was investigated to promote the separation of scheelite from calcite and fluorite. 1-Hydroxyethylidene-1, 1-diphosphonicacid (HEDP) could efficiently reduce the recoveries of calcite and fluorite to less than 20%, while that of scheelite remained above 85%. The selective interaction mechanism was demonstrated via Zeta potential and X-ray photoelectron spectroscopy (XPS) analyses. The conceivable adsorption models of reagents on mineral surfaces were constructed to explain their adsorption mechanism. HEDP exhibited an excellent ability to selectively depress calcite and fluorite attributed to the intense adsorption on their surfaces, whereas its adsorption on scheelite surface was feeble. The technology feasibility of using HEDP to improve the scheelite flotation performance was verified through laboratory and industrial tests. The roughing grade was dramatically improved from 1.22% to 1.68%, and the product grade was enhanced from 24.66% to 28.26% with a noteworthy improvement of cleaning recovery by 6.93%, which would produce a considerable economic benefit.
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