Method for concentrating and purifying titanium dioxide waste acid by using complex acid
A technology for concentration and purification of titanium dioxide waste acid, which is applied to chemical instruments and methods, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem that the waste heat of the exhaust gas of rotary kiln calcination is not effectively utilized, and achieve the reduction of titanium content and reduction The effect of condensing cost and less investment
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Embodiment 1
[0032] The waste acid in the titanium dioxide production process, its main component, is calculated by mass ratio as: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 4 2%, 0.5% metatitanic acid, through countercurrent spraying and rotary kiln calcined tail gas, use the waste heat of calcined tail gas to increase the concentration to 25%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid; add waste acid to In the waste acid configuration tank, add concentrated sulfuric acid with a sulfuric acid mass fraction of 98%, add 1t of concentrated sulfuric acid for every 3.5t of waste acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the gradient cooling range is 8°C / h, and the aging time is 10h; when the temperature drops below 60°C, all the mixed acid is poured into a filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid . The mass fraction is 4...
Embodiment 2
[0034] The waste acid in the production process of titanium dioxide, its mass ratio is: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 42%, 0.5% metatitanic acid, through countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to increase the concentration to 28%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid. Add the spent acid to the spent acid configuration tank, then add concentrated sulfuric acid with a sulfuric acid mass fraction of 96%, add 1t of concentrated sulfuric acid for every 2.3t of spent acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the range of gradient cooling is 5°C / h, and the aging time is 8h. When the temperature drops below 62°C, all the mixed acid is poured into the filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid. The mass fraction is 50.3%, the iron co...
Embodiment 3
[0036] The waste acid in the production process of titanium dioxide, its mass ratio is: H 2 SO 4 21%, FeSO 4 8.5%, MgSO 4 2%, TiO metatitanate 2 0.5%, through countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to concentrate to 32%, and then recover metatitanic acid through waste acid flocculation and sedimentation to obtain clear waste acid. Add the spent acid to the spent acid configuration tank, then add concentrated sulfuric acid with a sulfuric acid mass fraction of 93%, add 1t of concentrated sulfuric acid for every 1.5t of spent acid, and mix the two evenly to obtain a mixed acid. Then carry out gradient cooling and aging, the range of gradient cooling is 2°C / h, and the aging time is 7h. When the temperature drops below 65°C, all the mixed acid is poured into the filter press for solid-liquid separation, and the liquid phase is separated to obtain sulfuric acid. The mass fraction is 58.2%, the iron content in su...
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