Aluminothermic production of magnesium and an oxidic slag containing recoverable alumina
Abstract
Abstract AN ALUMINOTHERMIC PROCESS FOR THE PRODUCTION OF MAGNESIUM BY THE REDUCTION OF MAGNESIUM OXIDE FROM A MIXTURE OF MAGNESIUM OXIDE AND CALCIUM OXIDE, BY MEANS OF A METALLIC REDUCING AGENT COMPRISING AT LEAST 85 PERCENT ALUMINUM, IN THE PRESENCE OF A MOLTEN CALCIUMALUMINATE SLAG BATH AT A TEMPERATURE OF ABOUT 13001700*C. MAGNESIUM EVOLVES FROM THE MOLTEN SLAG AS A VAPOR. THE PROCESS MAY BE OPERATED CONTINUOUSLY AND AT ATMOSPHERIC PRESSURE. THE MOLTEN SLAG RESIDUE IS TAPPED PERIODICALLY, WHEN THE MGO LEVEL IS BELOW 5 PERCENT, AND HAS A COMPOSITION OF 35-65 PERCENT AL2O3, 35-55 PERCENT CAO AND 0-10 PERCENT SIO2 (BY WEIGHT). THE DISCLOSURE DEMONSTRATES HOW THE RATIO OF MAGNESIUM OXIDE TO CALCIUM OXIDE IN THE CHARGE AND THE QUANTITY AND COMPOSITION OF THE METALLIC REDUCING AGENT ARE INTERRELATED IN SUCH A WAY THAT (1) VIRTUALLY ALL OF BOTH THE REDUCING AGENT AND MAGNESIUM OXIDE ARE CONSUMED IN THE REDUCING REACTION, AND (2) THE CALCIUM-ALUMINATE SLAG PRODUCED IS OF SUCH A COMPOSITION THAT PURE ALUMINA CAN BE RECOVERED FROM IT WITH A VERY HIGH YIELD.
Inventors
- 👤 Avery J Miles
Bibliographic Details
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