Pre-activation of nepheline before the enrichment

Due to limited reserves of bauxite, nepheline can be used in the industrial production alumina Kazakhstan. The most promising deposit is syenites Kubasadyr deposit. Currently, there no effective technology for processing ores. High energy intensity, capital intensity and significant emissions into atmosphere are main drawbacks conventional ore by sintering method. Efficient hydrochemical requires pre-enrichment with separation a part silica. According existing chemical enrichment an alkaline solution at temperature 280⁰С, silica extraction degree more than 36%. A pre-roasting 500⁰C increase rate this process permits 65%. paper presents results activation sodium hydrogen carbonate. optimum conditions determined. Activation 280 ⁰C resulted change phase composition feedstock increases up 65,5%. obtained showed possibility principle using resulting high-quality concentrate replacing energy-intensive roasting process.