Collector compositions for froth flotation and process for making same
OwnerRonald D. G. Crozierinventor
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Abstract
Dialkyl xanthogen formates are known collectors, but the reaction that produces them, between an alkaline alkyl xanthate and an alkaline chloroformate, also causes side reactions which produce varying amounts of xanthic anhydride, carbonyl sulfide and dialkyl carbonate as by-products, and yield of formate may be as low as 30%. There are here disclosed processing schemes for controlling the amount and type of products and by-products produced in the reaction, and flotation tests show that certain product mixtures are significantly improved collectors for sulfide ores.
Claims8
An improved flotation collector composition consisting essentially of an alkyl xanthogen alkyl formate and dialkyl xanthic anhydride.
An improved flotation collector composition consisting essentially of an alkyl xanthogen alkyl formate and 10 to 30% of a carbonyl sulfide.
An improved collector composition consisting essentially of an alkyl xanthogen alkyl formate and 10% to 30% by weight of a dialkyl dixanthogen.
An improved flotation collector consisting essentially of the reaction product of an alkaline alkyl xanthate and an alkyl chloroformate according to the generalized reaction:
- ##STR7## where R is a mixture of 80% ethyl and 20% isobutyl, and R' is ethyl, and M is selected from the group consisting of sodium and potassium;
- and wherein
- a soluble calcium salt is added to an aqueous xanthate solution to provide 2-5% Ca++ by weight as CaCl.sub.2 compared to Xanthate;
- said xanthate solution is added to said chloroformate in proportion of 1 mole chloroformate to 1-2 moles xanthate;
- and
- the reaction temperature is maintained in the range of 35.degree. to 60.degree. C., depending on the size of the xanthate alkyl group;
- whereby the amount of dialkyl xanthic anhydride produced as a by-product may be controlled within the range of 13-60%.
Dependencies are inferred from the claim text.