A method for preparing magnesium metal and calcium boride by using boronite as raw material and utilizing vacuum thermal reduction method
A technology of vacuum heat and boronite, which is applied in the direction of metal borides, boron/borides, etc., can solve the problems of less calcium boride, high production cost, complicated production methods, etc., and achieve huge application space, huge economic benefits, The effect of good application prospects
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Embodiment 1
[0048] 1) Extraction of metallic magnesium by vacuum thermal reduction
[0049] The natural boronite (MgO>30wt%) with low silicon and high magnesium in mass ratio is 1:1, SiO 2 2 o 3 and CaB 6 and contains a small amount of SiO 2 ), gaseous metal magnesium is condensed and crystallized on a magnesium crystallizer to obtain solid metal magnesium; wherein the reducing agent is industrial aluminum powder, and the particle size is less than 0.2mm;
[0050] 2) Separation of Al(OH) from the leaching solution of the slag block 3
[0051] Grind the slag block obtained in step 1) until the particle size is less than 0.2mm, then put it into the alkali solution, and soak it at 300°C for 20min, so that the Al in the slag block 2 o 3 Take NaAl(OH) 4 The form is leached in the alkaline solution, and the CaO combined with alumina in the slag is CaCO 3 form precipitates, while CaB 6 Other components do not participate in the reaction and remain in the precipitate, wherein the liquid-...
Embodiment 2
[0056] 1) Extraction of metallic magnesium by vacuum thermal reduction
[0057] According to the mass ratio of 1:2, the low-silicon boronite (MgO>30wt%, SiO2) after desiliconization by flotation 2 2 o 3 and CaB 6 and contains a small amount of SiO 2 ), gaseous metal magnesium is condensed and crystallized on a magnesium crystallizer to obtain solid metal magnesium; wherein the reducing agent is industrial aluminum-magnesium alloy powder, and the particle size is less than 0.2mm;
[0058] 2) Separation of Al(OH) from the leaching solution of the slag block 3
[0059] Grind the slag block obtained in step 1) until the particle size is less than 0.2 mm, then put it into an alkaline solution, and soak it for 300 min at 50 ° C to make the Al in the slag block 2 o 3 Take NaAl(OH) 4 The form is leached in the alkaline solution, and the CaO combined with alumina in the slag is CaCO 3 form precipitates, while CaB 6 Other components do not participate in the reaction and remain...
Embodiment 3
[0064] 1) Extraction of metallic magnesium by vacuum thermal reduction
[0065] The natural boronite (MgO>30wt%) with low silicon and high magnesium (MgO>30wt%, SiO 2 3 Mix, then crush, and then put it into a grinding device to grind until the particle size is less than 0.2mm, make the ground raw material into agglomerates, then put the agglomerates into the furnace, and calcinate at 700°C for 120min; The agglomerates are crushed until the particle size is less than 0.2mm, and then mixed evenly with the reducing agent at a mass ratio of 1:0.01, and then made into agglomerates again, placed in a high-temperature vacuum reduction reaction furnace with a magnesium crystallizer, at a temperature below Under the conditions of 40Pa pressure and 1100℃ temperature, vacuum thermal reduction for 200min will generate gaseous metal magnesium and slag (mainly containing CaO, Al 2 o 3 and CaB 6 and contains a small amount of SiO 2 ), gaseous metal magnesium is condensed and crystallized...
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