Process for recovering pyrochlore mineral containing niobium and tantalum
Patent 4493817 Issued on January 15, 1985. Estimated Expiration Date: 
July 6, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 6, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2494283 2725394 2951585 2957931 2961457 2969378 2990420 3014585 Process for treatment of pyrochlore concentrates Patent #: 3947542 InventorAssigneeApplicationNo. 06/511253 filed on 07/06/1983US Classes:423/62, Group VB metal (V, Nb, or Ta)209/166, With modifying agents423/65, Forming insoluble substance in liquid423/68Leaching, washing, or dissolvingExaminersPrimary: Rutledge, L. DewayneAssistant: Kastler, S. Attorney, Agent or FirmInternational ClassesB03D 1/014 (20060101)B03D 1/004 (20060101) B03B 9/00 (20060101) B03D 1/001 (20060101) AbstractNiobium and tantalum containing pyrochlore is recovered from high silicate gangue content ore with good selectivity and yield employing collectors of formula ##STR1## wherein R1, R2 and R3 are independently 8 to 16 carbon straight or branched chain alkyl groups, at pH 1.5 to 6.5.Other References
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