Method for preparing sodium chromate
A sodium chromate and acid technology, applied in chromate/dichromate and other directions, can solve the problems of low product quality, environmental degradation, aggravated greenhouse effect, etc., and achieve the effect of reducing production cost and improving product quality
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Embodiment 1
[0057] will be 1m 3 The sodium chromate alkaline solution obtained by roasting chromite and leaching is heated to 100°C and kept constant, wherein the concentration of sodium chromate alkaline solution is 537g L -1 (in Na 2 CrO 4 4H 2 O meter).
[0058] 1000m under stirring 3 Wherein, the cement kiln tail gas with a carbon dioxide concentration of about 15% by volume is passed into the sodium chromate alkaline solution until the pH of the solution is reduced to 9.3, and then filtered with a plate and frame filter press to obtain a transparent and clear solution.
[0059] To the above solution at pH 9.3 was added 0.3m 3 From the pre-carbonization solution in the carbonization process to produce sodium rufium, the pH of the solution is adjusted to 8.3, wherein the concentration of the pre-carbonization solution is 357g L -1 (in Na 2 Cr 2 o 7 2H 2 O meter), the pH is 6.6.
[0060] The above solution with a pH of 8.3 was evaporated to a concentration of 1099 g L -1 (in...
Embodiment 2
[0063] will be 1.1m 3 The sodium chromate alkaline solution obtained by roasting chromite and leaching is heated to 90°C and kept constant, wherein the concentration of sodium chromate alkaline solution is 452g L -1 (in Na 2 CrO 4 4H 2 O meter).
[0064] 550m under stirring 3 The tail gas of the lime kiln with a carbon dioxide concentration of about 31% by volume is passed into the sodium chromate alkaline solution until the pH of the solution is reduced to 9.0, and then filtered with a plate and frame filter press to obtain a transparent and clear solution.
[0065] To the above solution at pH 9.0 was added 0.15m 3 From the carbonization solution in the process of carbonization to produce sodium red alum, the pH of the solution is adjusted to 7.8, wherein the concentration of the carbonization solution is 925g L -1 (in Na 2 Cr 2 o 7 2H 2 O meter), pH is 5.8.
[0066] Evaporate the above solution with pH 7.8 to a concentration of 1015 g L -1 (in Na 2 CrO 4 4H 2 ...
Embodiment 3
[0069] will be 1.0m 3 The sodium chromate alkaline solution obtained by roasting chromite and leaching is heated to 95°C and kept constant, wherein the concentration of sodium chromate alkaline solution is 517g L -1 (in Na 2 CrO 4 4H 2 O meter).
[0070] 1800m under stirring 3 Wherein the chromite ore oxidation roasting rotary kiln exhaust gas with a carbon dioxide concentration of about 12% by volume is passed into a sodium chromate alkaline solution until the pH of the solution is reduced to 9.4, and then filtered using a plate and frame filter press to obtain a transparent and clear The solution.
[0071] To the above solution at pH 9.4 was added 0.1m 3 From the electrolytic solution in the process of carbonization to produce sodium red alum, the pH of the solution is adjusted to 8.0, wherein the concentration of the electrolytic solution is 983g L -1 (in Na 2 Cr 2 o 7 2H 2 O meter), the pH is 0.8.
[0072] Evaporate the above pH 8.0 solution to a concentration ...
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