Method for lowering chromium pollution risk in electric furnace slag
A technology for electric furnace steel slag and chromium pollution, applied in the field of metallurgy, can solve problems such as low cooling rate and pollution, and achieve the effects of low energy consumption, treatment cost advantages, and thorough detoxification
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[0024] Example 1
[0025] After the stainless steel slag produced by the electric furnace is normally discharged, the molten stainless steel slag is charged into the slag tank. The main components of the stainless steel slag are CaO 46.8%, SiO 2 31.2%, MgO 10%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%.
[0026] Will Al 2 O 3 The modifier is added to the molten stainless steel slag, and the stainless steel slag and Al 2 O 3 The additives are evenly mixed to form a molten mixed slag, in which Al 2 O 3 The mass of the additive is 8% of the molten stainless steel slag. Al 2 O 3 The ground is fine to particle size ≤74 mesh.
[0027] The molten stainless steel slag is reduced to below 1300°C at 3°C / min to obtain a slag with spinel phase as the main occurrence state of chromium; the concentration of chromium in the spinel phase is measured to reach more than 99%, and the chromium in the slag The leaching concentration is lower than 0.01mg / L.
Example Embodiment
[0028] Example 2
[0029] After the stainless steel slag produced by the electric furnace is normally discharged, the molten stainless steel slag is charged into the slag tank. The main components of the stainless steel slag are CaO 48% and SiO 2 32%, MgO 8%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%.
[0030] FeC 2 O 4 ·2H 2 O is added to the molten stainless steel slag, and the stainless steel slag and FeC 2 O 4 ·2H 2 The O additive is uniformly mixed to form a molten mixed slag, wherein the added amount of FeO after conversion is 6% of the molten stainless steel slag. FeC 2 O 4 ·2H 2 O additive is ground to a particle size ≤ 74 mesh.
[0031] The molten stainless steel slag is reduced to below 1300°C at 3°C / min to obtain a slag with spinel phase as the main occurrence state of chromium; the concentration of chromium in the spinel phase is measured to reach more than 99%, and the chromium in the slag The leaching concentration is lower than 0.10mg / L.
Example Embodiment
[0032] Example 3
[0033] After the stainless steel slag produced by the electric furnace is normally discharged, the molten stainless steel slag is charged into the slag tank. The main components of the stainless steel slag are CaO 48% and SiO 2 32%, MgO 8%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%.
[0034] The MnO powder is added to the molten stainless steel slag, and the stainless steel slag and the MnO additive are uniformly mixed by stirring to form a molten mixed slag, wherein the addition amount of MnO is 8% of the molten stainless steel slag. MnO is ground to a particle size ≤ 74 mesh.
[0035] The molten stainless steel slag is reduced to below 1300°C at 3°C / min to obtain a slag with spinel phase as the main occurrence state of chromium; the concentration of chromium in the spinel phase is measured to reach more than 99%, and the chromium in the slag The leaching concentration is lower than 0.12mg / L.
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