Roasting temperature of aluminum-iron separation experiment in high-alumina limonite ore dressing

High aluminum limonite ore beneficiation and iron aluminum complex relationship disseminated, compact structure, using conventional processing methods can not be effectively separated ferric. It is well known that the sodium salt roasting can convert the insoluble component mineral into a soluble corresponding sodium salt under a certain temperature and atmosphere condition, and the obtained calcined water is leached with water, dilute acid or dilute alkali, and the daily component is transferred into the solution. So that some components are enriched. The mineral processing equipment manufacturer mainly uses sodium salt roasting to convert aluminum to sodium into sodium salt, destroys the compact structure of aluminum iron in limonite, and then separates aluminum and iron by leaching. The factors affecting the separation effect of aluminum and iron are mainly the calcination temperature, the calcination time and the salt application amount.

Calcination temperature

Experts in mineral processing equipment have found that the effect of calcination temperature on the content of TFe and Al 2 O 3 in iron concentrates is obtained when the mass ratio of Na 2 CO 3 is 9% and the calcination time is 15 min . When the calcination temperature is 750~1000 °C , the Al 2 O 3 content in the iron concentrate gradually decreases with the increase of the calcination temperature , and the iron crystal position gradually rises . When the calcination temperature is 1000 °C , the Al 2 O 3 content decreases to 1.89% , the iron grade is increased to 60.95% , and the separation effect of aluminum and iron is better. However, when the calcination temperature continues to increase, the Al 2 O 3 content increases, and the separation effect of aluminum and iron deteriorates. Studies have shown that a suitable calcination temperature is 950~1000 °C .

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