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.
4 Deck Roller Veneer Dryer is one of Shine roller veneer drying machines. It is equipped with automatic feeder which ensures a very high feeding rate. The 4 deck roller veneer dryer has the biomass burner or hot blast stove or wood fired heater or furnace as heat medium. The biomass burner has no heat loss by direct heating air and supplying to the dryer instead of indirect heating of water or oil. The drying cost is as low as $6-$12 per cbm.
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Chemical purification of graphite concentrate