Depressant for flotation separation of polymetallic sulphidic ores
AssigneeFalconbridge Limited
InventorsSrdjan Bulatovic, Tim M. Jessup, James F. Jackson
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Abstract
A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and forthing agents in the flotation separation of copper, nickel, lead, zinc sulphides by depressing iron sulphides such as pyrrhotite, pyrite and marcasite in the tailing. The depressant consists of a cross-linked starch chemically combined with a polyacrylate and sugar free lignin sulphonate.
Claims5
A polymeric lignin sulphonate bearing cross-linked starch polyacrylate reagent for depressing iron sulphidic minerals in a mineral froth flotation separation process, comprising the ultimate reaction product of:
- a) a starch in aqueous solution causticized by heating with an alkaline solution at a temperature less than 100.degree. C.,
- b) a cross-linking agent reacted with the starch so causticized,
- c) a polyacrylic acid reacted with the cross-linked starch resulting in step b) thereby yielding an aqueous colloidal suspension, and
- d) a lignin sulphonate containing less than 0.1% sugar, reacted with the colloidal suspension of the cross-linked starch polyacrylate resulting in step c).
Dependencies are inferred from the claim text.