A kind of thermite reduction prepares the method for magnesium-calcium alloy
A magnesium-calcium alloy and aluminothermic technology, applied in the field of metallurgy, can solve the problems of short process, intense secondary reaction, and unsuitable collection of product purity, and achieve the effects of low cost, high production efficiency and high product purity.
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Embodiment 1
[0026] The method for preparing magnesium-calcium alloy by thermite reduction includes the following steps:
[0027] Step 1. MgO powder with a particle size of 61 μm, CaO powder with a particle size of 61 μm and Al powder with a particle size of 175 μm, according to the mass ratio of MgO powder: CaO powder: Al powder = 100: 87: 46, mix evenly;
[0028] Step 2. The mixture is pressed by a press at a pressure of 100 MPa to form a mass with a thickness of about 4 mm;
[0029] Step 3. After the agglomerates are put into the reduction tank and evacuated to 1 Pa, the reduction tank is kept at 1150°C for 6 hours to reduce magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;
[0030] Step 4. After the magnesium vapor and the calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 2.5-3.5 wt.% is obtained in the crystallizer.
[0031] The process flow chart of the method for preparing magnesium-calcium alloy by thermite reduction of this embodiment i...
Embodiment 2
[0033] The method for preparing magnesium-calcium alloy by thermite reduction includes the following steps:
[0034] Step 1. Select 74μm MgO powder, 74μm CaO powder and 125μm Al powder, and mix them evenly according to the mass ratio of MgO powder: CaO powder: Al powder = 100:96:48;
[0035] Step 2. The mixture is pressed by a press at a pressure of 80 MPa to form a mass with a thickness of about 6 mm;
[0036] Step 3. After the agglomerates are put into the reduction tank and evacuated to 4 Pa, the reduction tank is kept at 1200°C for 5 hours to reduce the magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;
[0037] Step 4. After the magnesium vapor and the calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 5-7 wt.% is obtained in the crystallizer.
[0038] The process flow chart of the method for preparing magnesium-calcium alloy by thermite reduction of this embodiment is shown in figure 1 .
Embodiment 3
[0040] The method for preparing magnesium-calcium alloy by thermite reduction includes the following steps:
[0041] Step 1. Select MgO powder with a particle size of 104 μm, CaO powder with 104 μm and Al powder with 96 μm, and mix them evenly according to the mass ratio of MgO powder: CaO powder: Al powder = 100:103:50;
[0042] Step 2. The mixture is pressed by a press at a pressure of 60 MPa to form a mass with a thickness of about 8 mm;
[0043] Step 3. After the agglomerates are put into the reduction tank and evacuated to 7Pa, the reduction tank is kept at 1250°C for 4 hours to reduce magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;
[0044] Step 4. After the magnesium vapor and the calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 7.5 to 10.5 wt.% is obtained in the crystallizer.
[0045] The process flow chart of the method for preparing magnesium-calcium alloy by thermite reduction of this embodiment is shown in figure 1 ...
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