Method for smelting magnesium through vacuum thermal reduction of precast pellets
A technology of prefabricated pellets and vacuum heat, applied in the field of metallurgy, can solve the problems that powder and fine materials cannot be produced by smelting magnesium, high-activity segment white is easy to absorb water, storage and transportation costs are high, and it can improve the utilization rate of magnesium resources and system performance. Low consumption, the effect of reducing energy consumption
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Embodiment 1
[0029] According to the dolomite: SiFe: fluorite mass ratio of 100: 12: 2, mix the materials evenly, then add water binder accounting for 3% of the total mass of the materials, and use a disc pelletizer to prepare green pellets with a diameter of 5mm group;
[0030] The green pellets were calcined under a nitrogen protective atmosphere. First, the temperature was raised to 650°C at a rate of 5°C / min, and the temperature was kept constant for 2 hours. Then, the temperature was raised to 1000°C at a rate of 5°C / min. to room temperature to obtain calcined cooked pellets;
[0031] The above-mentioned calcined cooked pellets were thermally reduced at 1150° C. for 1 hour under a vacuum degree of 10 Pa to obtain metallic magnesium, and the reduction rate of metallic magnesium was 91%.
Embodiment 2
[0033] According to the mass ratio of dolomite: aluminum powder: fluorite 100: 13: 2, mix the materials evenly, then add a kaolin binder accounting for 4% of the total mass of the material, and use a disc pelletizer to prepare a pellet with a diameter of 10 mm. raw pellets;
[0034] The green pellets were calcined under a nitrogen protective atmosphere. First, the heating rate was raised to 700°C at a rate of 8°C / min, and the temperature was kept at a constant temperature for 2 hours. At room temperature, calcined cooked pellets are obtained;
[0035] The above-mentioned calcined cooked pellets were thermally reduced at 1150°C for 1.5 hours under a vacuum degree of 10 Pa to obtain metal magnesium, and the reduction rate of metal magnesium was 92%.
Embodiment 3
[0037] According to the dolomite: AlSi alloy powder: fluorite mass ratio of 100: 13: 2, mix the materials evenly, then add polyvinyl alcohol binder accounting for 4% of the total mass of the material, and use a disc pelletizer to prepare a diameter 20mm raw pellets;
[0038] The green pellets were calcined under a nitrogen protective atmosphere. First, the heating rate was raised to 700°C at a rate of 20°C / min, and the temperature was kept constant for 1 hour. Then, the temperature was raised to 950°C at a rate of 10°C / min. to room temperature to obtain calcined cooked pellets;
[0039] The above-mentioned calcined cooked pellets were thermally reduced at 1150° C. for 0.5 h under a vacuum degree of 10 Pa to obtain metal magnesium, and the reduction rate of metal magnesium was 94%.
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