Method for recycling chromium from chromium-extracting tailing iron powder
A technology of tailings and iron powder, applied in chemical instruments and methods, improvement of process efficiency, solid separation, etc., to achieve the effects of reducing production costs, increasing economic benefits, and improving market competitiveness
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Embodiment 1
[0023] Step 1, take 500 kg of carbon ferrochrome through the oxygen-enriched liquid phase oxidation chromium extraction by-product tailing iron powder, add 15 kg of carbon powder, stir and mix evenly, and then put it into a sagger.
[0024] Step 2, place the sagger loaded with the mixture in a roller kiln, perform static high-temperature calcination at 780 ° C, and perform reduction modification for 3 hours. After reduction, carbon ferrochrome still exists in the form of carbon ferrochrome, while trioxide Ferrous iron is reduced to ferric iron tetroxide.
[0025] Step 3, cooling and pulverizing the calcined tailings iron powder to a particle size of 50-300 mesh, separating ferrochrome carbon and ferroferric oxide powder through magnetic separation, and recovering the tailings iron powder after chromium The carbon-containing ferrochrome is 0.5%.
Embodiment 2
[0027] Step 1: Take 800 kg of carbon ferrochromium by-product tailing iron powder through oxygen-enriched liquid phase oxidation to extract chromium, add 40 kg of carbon powder, stir and mix evenly, and then put it into a sagger.
[0028] Step 2, place the sagger loaded with the mixture in a roller kiln, perform static high-temperature calcination at 880 ° C, and perform reduction modification for 1 hour. After reduction, carbon ferrochrome still exists in the form of carbon ferrochrome, while trioxidized Ferrous iron is reduced to ferric iron tetroxide.
[0029] The calcined tailing iron powder is cooled and crushed until the particle size is 50-300 mesh, and the ferrochrome carbon and ferric oxide powder are separated by magnetic separation, and the iron powder after recovery of chromium contains total carbon Ferrochrome is 0.3%.
Embodiment 3
[0031] Step 1, take 1000 kg of carbon ferrochrome by-product tailing iron powder through oxygen-enriched liquid phase oxidation to extract chromium, add 25 kg of carbon powder, stir and mix evenly, and then put it into a sagger.
[0032] Step 2, place the sagger loaded with the mixture in a roller kiln, perform static high-temperature calcination at 900 ° C, and perform reduction modification for 2 hours. After reduction, carbon ferrochrome still exists in the form of carbon ferrochrome, while trioxide Ferrous iron is reduced to ferric iron tetroxide.
[0033] The calcined tailing iron powder is cooled and crushed until the particle size is 50-300 mesh, and the ferrochrome carbon and ferric oxide powder are separated by magnetic separation, and the iron powder after recovery of chromium contains total carbon Ferrochrome is 0.35%.
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