METHOD OF PRODUCING HIGH-PURITY SPHEN AND AEGIRINE CONCENTRATES Russian patent published in 2012 - IPC B03D1/00 B03B7/00 

FIELD: process engineering.

SUBSTANCE: invention may be used in dressing of minerals and chemical technology for production of sphen and aegirine concentrates of stable quality irrespective of ore composition. Proposed method comprises acid cleaning of mineral impurities, and magnetic separation on low- and high-intensity fields. Prior to acid cleaning, froth product of reverse nepheline flotation is subjected to cleaning using nontoxic depressor, for example, liquid glass or sodium fluorosilicate and acid cleaning in 15% sulfuric acid on mixing for 2-3 h at t=40-50°C. Then, after washing, it is dried and subjected to magnetic separation in high-intensity fields for production of target concentrates.

EFFECT: higher yield.

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