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Expired
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GB27478/23A
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Individual
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Individual
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Publication of GB206509ApublicationCriticalpatent/GB206509A/en
206,509. Gredt, P. Nov. 4, 1922, [Convention date]. Void [Published under Sect. 91 of the Act]. Treating ores to facilitate concentration and to remove undesired constituents.-Oolitic, marly or like iron ores are preliminarily treated by crushing or grinding so as to liberate the grains of iron ore from the gangue, followed by wet or magnetic separation. In an alternative method, the ores may be heated so as to calcine the calcareous gangue, and the product slaked; the calcined and slaked material may be subjected to friction, after which part of the gangue is removed by blastsifting or otherwise.
GB27478/23A1922-11-041923-11-01Improved process for concentrating oolitic iron ores
ExpiredGB206509A
(en)
Improvements in or relating to processes for the extraction of precious metals from ores, residues and metallurgical products of various kinds containing the same