Enhanced pyrite rejection in coal flotation
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Center for Coal and Minerals Processing
Difficulties in rejecting pyrite from coal by flotation primarily result from two mechanisms of particle recovery: attachment and middlings. Attachment of pyrite is the consequence of surface hydrophobicity induced by superficial oxidation; middlings that can float readily are caused by incomplete liberation of pyrite from coal. New flotation schemes have been developed to enhance pyrite rejection. They are referred to as Electrochemically-Enhanced Sulfur Rejection (EESR) and Polymer-Enhanced Sulfur Rejection (PESR) processes. In the EESR process, the formation of hydrophobic products is prevented by electrochemical techniques in which active metals are used as sacrificial anodes to cathodically protect pyrite from oxidation; in the PESR process, hydrophilic polymers is used to mask coal in middlings by specific adsorption on pyrite, and thus depress coal-pyrite middlings.
- DOE Contract Number:
- AC22-92PC92246
- OSTI ID:
- 51918
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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