Method for preparing chromel alloy by stainless steel pickling sludge
A technology of pickling sludge and nickel-chromium alloy, which is applied in the field of metal smelting and can solve the problems of underutilization, environmental pollution, waste of resources, etc.
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Embodiment 1
[0016] Various indicators of pickling sludge in a stainless steel plant: the main chemical components of stainless steel pickling sludge are: Ni1.2%, Cr 5%, and waste acid H 2 SO 4 , HCl, HNO 3 and HF.
[0017] The method for preparing nickel-chromium alloys from stainless steel pickling sludge comprises the following steps: adding calcium hydroxide to the stainless steel pickling sludge to adjust the pH to 6.5 to obtain neutral sludge; adding the neutral sludge to a rotary kiln at 250°C Carry out drying to obtain the dry basis; add the dry basis to the ball making machine, and at the same time add coke and starch for ball making to obtain mixed granules; put the mixed granules into the rotary kiln for reduction smelting, and control the smelting temperature at 1250 ° C, and add NCP at the same time -2 The initial reduction reaction of additives is carried out for 1 hour to obtain the metal state ball; the metal state ball is hot-packed into the plasma electric furnace to me...
Embodiment 2
[0020] Various indicators of pickling sludge in a stainless steel plant: the main chemical components of stainless steel pickling sludge are: Ni3%, Cr 6%, and waste acid H 2 SO 4 , HCl, HNO 3 and HF.
[0021] The method for preparing nickel-chromium alloys from stainless steel pickling sludge comprises the following steps: adding calcium hydroxide to the stainless steel pickling sludge to adjust the pH to 7.5 to obtain neutral sludge; adding the neutral sludge to a rotary kiln at 300°C Carry out drying to obtain the dry basis; add the dry basis to the ball making machine, and at the same time add coke and starch to make balls to obtain mixed granules; put the mixed granules into the rotary kiln for reduction smelting, and control the smelting temperature at 1400 ° C, and add sulfuric acid at the same time Sodium was initially reduced for 2 hours to obtain a metal state ball; the metal state ball was hot-packed into a plasma electric furnace to melt and smelt the nickel-chrom...
Embodiment 3
[0024] Various indicators of pickling sludge in a stainless steel plant: the main chemical components of stainless steel pickling sludge are: Ni2.1%, Cr 5.5%, and waste acid H 2 SO 4 , HCl, HNO 3 and HF.
[0025] The method for preparing a nickel-chromium alloy from stainless steel pickling sludge comprises the following steps: adding calcium hydroxide to the stainless steel pickling sludge to adjust the pH to 7 to obtain neutral sludge; adding the neutral sludge to a rotary kiln at 275°C Carry out drying to obtain the dry basis; add the dry basis to the ball making machine, and at the same time add coke and starch to make balls to obtain mixed granules; put the mixed granules into the rotary kiln for reduction smelting, and control the smelting temperature at 1350 ° C, and add NCP at the same time -2 Additives undergo initial reduction reaction for 1.5 hours to obtain metal state balls; heat pack the metal state balls into a plasma electric furnace to melt and smelt the nic...
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