The chemical purification of concentrates is available in wet, dry and high temperature purification. Wet purification ore is added at 500 ℃ sodium hydroxide or sodium carbonate was added at a temperature of 800 deg.] C to generate the soluble silicate mineral silicates, and then removed by flooding, other dissolved metals in addition to hydrochloric acid or sulfuric acid The hydroxide precipitates. Hydrofluoric acid can also be used to dissolve silicate minerals and metallic impurities. Dry purification is the introduction of active chemical gases into the ore, converting the ash in the ore into volatiles and escaping from the ore. High-temperature purification is carried out by placing the graphite concentrate in an electric furnace and heating it to 2500 ° C under isolated air to evaporate the impurities.
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