Aryl (cresylic or phenyl based) and alkyl based dithiophosphates enhance the recovery of free silver minerals and that mineralization not associated with specific base metal sulphide minerals. Flotation response of silver minerals is normally best at natural pH because lime tends to depress silver minerals in flotation.
Use of soda ash for elevating pH is suggested as an alternative pH modifier. Alkyl dithiophosphates are used when high silver mineral selectivity is required.
When silver is associated with metal sulphide minerals, normal flotation practices used for floating the specific sulphides will also recover silver values.
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The following Danafloat™ collectors should be initially considered for silver ore flotation: