Flotation recovery of pyrochlore
Patent 4178235 Issued on December 11, 1979. Estimated Expiration Date: 
June 30, 1998. 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.
June 30, 1998. 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 2875896 2953569 2959281 3430765 InventorApplicationNo. 05/921116 filed on 06/30/1978US Classes:209/166With modifying agentsExaminersPrimary: Halper, RobertInternational ClassesB03D 1/004 (20060101)B03D 1/01 (20060101) AbstractPyrochlore, an economically important mineral source of niobium and tantalum, is recovered by flotation. Normally this requires numerous stages of concentrate cleaning because of the physical character of the froth, i.e., its consistency and stability.The use of 5-hydroxy quinoline as the collector/frother provides a froth with improved physical properties permitting a reduction of the required number of stages of flotation cleaning and improved recovery at a required concentrate grade. | |
