Method for producing metallic chromium
A technology of metal chromium and chromium oxide, applied in the field of producing metal chromium, can solve the problems of large quantity and high production cost
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Embodiment 1
[0018] Featured Cr 2 o 3 Content greater than 99.50%, 100 kg of chromium oxide with a particle size of 325 meshes, 23.7 kg of carbon powder with a carbon content of 99.2% and a total content of Fe, Si and Al of less than 0.1% (added in a theoretical amount of 99.8%), after simple mixing, Put it into a ball mill with a diameter of 1000mm and 150kg of 5-50mm agate balls. After grinding and mixing for 2 hours, the briquetting is formed. The diameter of the block is 150mm and the density is 2.95g / cm 3 .
[0019] Put the block into a vacuum furnace, evacuate to 250Pa, heat up to 1500°C, keep warm for 6 hours, the vacuum degree reaches 200Pa, cool down to 1430°C, keep warm for 5 hours, the vacuum degree reaches 20Pa, cool down to 200°C and leave the furnace.
[0020] After determination, the main chemical components of the product are as follows:
[0021] Cr: 99.5%, O: 0.35%, C: 0.017%, Al: 0.02%
Embodiment 2
[0023] Featured Cr 2 o 3 Content greater than 99.70%, 100 kg of chromium oxide with a particle size of 325 meshes, 23.8 kg of carbon powder with a carbon content of 99.4% and a total content of Fe, Si and Al of less than 0.1% (added in a theoretical amount of 100.2%), after simple mixing, Put it into a ball mill with a diameter of 1000mm and 150kg of 5-50mm agate balls. After grinding and mixing for 2 hours, the briquetting is formed. The diameter of the block is 150mm and the density is 2.95g / m 3 .
[0024] Put the material block into a vacuum furnace, vacuumize to 200Pa, heat up to 1520°C, keep warm for 6 hours, the vacuum degree reaches 200Pa, cool down to 1450°C, keep warm for 5 hours, the vacuum degree reaches 5Pa, cool down to 200°C and leave the furnace.
[0025] After determination, the main chemical components of the product are as follows:
[0026] Cr: 99.6%, O: 0.14%, C: 0.02%, Al: 0.015%
Embodiment 3
[0028] Featured Cr 2 o 3 Content greater than 99.70%, 100kg of chromium oxide with a particle size of 325 meshes, 23.60kg of carbon powder with a carbon content of 99.4% and a total content of Fe, Si and Al of less than 0.1% (added according to the theoretical amount of 99.5%), mixed briquetting with example 1.
[0029] Put the block into the vacuum furnace, pump the vacuum to 200Pa, heat up to 1550°C, keep the temperature for 6 hours and 10 minutes, the vacuum degree reaches 200Pa, cool down to 1400°C, keep the temperature for 5 hours and 30 minutes, the vacuum degree reaches 30Pa, and cool down to 200°C out of the oven.
[0030] After determination, the main chemical components of the product are as follows:
[0031] Cr: 99.15%, O: 0.42%, C: 0.02%, Al: 0.02%.
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