Method for preparing coarse-grained aluminum hydroxide by decomposing sodium aluminate solution with ultra-low seed amount
A technology of aluminum hydroxide and sodium aluminate, which is applied in the field of aluminum metallurgy, can solve the problems of increasing equipment load, increasing seed attachment, and not effectively reducing the amount of circulating seed crystals, so as to improve particle size distribution, increase nucleation rate, reduce Effect of Seed Amount
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Embodiment 1
[0031] Seed crystal preparation: take 300mL sodium aluminate solution ρ(Na 2 o k )=160g / L, ρ(Al 2 o 3 )=186.67g / L, α k =1.41) was added in 100mL sodium bicarbonate suspension (ρ(NaHCO 3 )=1000g / L), stirred at a constant temperature at 50°C for 60min, and the resulting slurry was filtered and washed to prepare seed crystals.
[0032] 900mL supersaturated sodium aluminate solution ρ(Na 2 o k )=160g / L, ρ(Al 2 o 3 )=186.67g / L, α k =1.41, ρ(Na 2 o c )=5g / L) into the seed sub-trough, add 0.5g of the prepared seed crystal while stirring, and start to decompose; the decomposition adopts constant temperature decomposition, the temperature is controlled at 55±0.5°C, and the constant temperature decomposition ends after 50 hours. At this time, the alumina The caustic ratio of the sodium solution is 3.04, and the decomposition rate is 53.62%. The decomposed slurry is filtered, and the filtrate is the seed separation mother liquor, which is returned to the dissolution process. ...
Embodiment 2
[0034] The seed crystal preparation mode is consistent with embodiment 1, and 950mL supersaturated sodium aluminate solution ρ(Na 2 o k )=155g / L, ρ(Al 2 o 3 )=175.84g / L, α k =1.45, ρ(Na 2 o c )=5g / L) into the seed sub-tank, add 0.5g of the previously prepared seed crystal while stirring, and start to decompose; the initial temperature of decomposition is 70°C, and the temperature is continuously lowered at a uniform speed for 0 to 15 hours, and the temperature drop is 10°C. For 16 to 30 hours, continuous and uniform cooling is also adopted, and the cooling range is 5°C. After that, it is decomposed at 55°C for 20 hours. After the decomposition is completed, the caustic ratio of the sodium aluminate solution is 3.21, and the decomposition rate is 54.83%. The decomposed slurry is filtered, and the filtrate is the seed separation mother liquor, which is returned to the dissolution process. The filter cake is the prepared aluminum hydroxide product. The particle size analysi...
Embodiment 3
[0036] The seed crystal preparation mode is consistent with embodiment 1, and 950mL supersaturated sodium aluminate solution ρ(Na 2o k )=165g / L, ρ(Al 2 o 3 )=179.75g / L, α k =1.51, ρ(Na 2 o c )=5g / L) into the seed sub-trough, add 1g of the previously prepared seed crystals while stirring, and start to decompose; the initial temperature of decomposition is 65°C, and the temperature is continuously lowered at a uniform speed for 0 to 7 hours, and the temperature drop range is 5°C, 8 Continuous uniform cooling is adopted for ~20 hours, and the cooling range is 5°C. Continuous uniform cooling is used for 21 to 32 hours, and the cooling range is 5°C. After that, the decomposition is continued at 50°C for 19 hours. After 51 hours of decomposition, the caustic ratio of the sodium aluminate solution was 3.31, and the decomposition rate was 54.38%. The decomposed slurry is filtered, and the filtrate is the seed separation mother liquor, which is returned to the dissolution process...
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