High-concentration sodium aluminate solution preparation
A sodium aluminate and high-concentration technology, applied in the field of preparation of high-concentration sodium aluminate solution, can solve the problems of reducing alumina, sodium oxide dissolution rate, loss of alumina and alkali, intensifying secondary reaction, etc., and achieve sedimentation separation Good effect, reduce the degree of secondary reaction, improve the effect of production capacity
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Embodiment 1
[0023] use as Figure 4 In the process flow shown, the first stage of clinker dissolution and separation can be carried out in existing production equipment. Take Al 2 o 3 The clinker with a content of 35% is used as the raw material, the addition amount is 190g / l, and the composition of the adjustment liquid is: α k 1.64, Al 2 o 3 60.11g / l, the dissolution temperature is 85°C, and the dissolution time is 10min. 2 o 3 120.61g / l, Na 2 o k 93.78g / l, SiO 2 2.61g / l; settling separation at 90°C, one without adding flocculant, the other adding flocculant, the amount of flocculant added is 5 / 100,000 of the amount of dry red mud, and the settling speed in 10min is 1.128 m / h and 1.194m / h, the liquid-solid ratio of 60min underflow compression is 3.41 and 2.88 respectively.
[0024] Add the overflow obtained from the first-stage eluate to the seed separation mother liquor after sedimentation and separation to make the second-stage elution adjustment liquid, whose composition...
Embodiment 2
[0026] The stripping and separation process of the first stage is the same as in Example 1.
[0027] The amount of clinker added in the second stage of dissolution is 280g / l, the particle size of clinker dissolution is controlled to be 0.098-0.53mm, and the composition of the adjustment solution is: Na 2 o k 123.0g / l, Al 2 o 3 111g / l, α k 1.82, Na 2 o c 20g / l, the dissolution temperature is 80°C, the dissolution time is 30min, after dissolution, it is graded, and the coarse sand returns to the second stage for dissolution; the dissolution rate of alumina in clinker is 91.85%, and the dissolution rate of sodium oxide is 94.87%. 2 o 3 197.17g / l, Na2 o k 171.98g / l, SiO 2 The slurry obtained at 7.68g / l was settled at 90°C, the sedimentation velocity was 1.158m / h in 10 minutes, and the liquid-solid ratio was 3.62 after 60 minutes of compression.
Embodiment 3
[0029] The stripping and separation process of the first stage is the same as in Example 1.
[0030] The amount of clinker added in the second stage of dissolution is 250g / l, the particle size of clinker dissolution is controlled to be 0.32-1.92mm, and the composition of the adjustment solution is: Na 2 o k 119.88g / l, Al 2 o 3 115.88g / l, Na 2 o c 24g / l, α k 1.70, dissolution temperature 90°C, dissolution time 60min, classification after dissolution, coarse sand returns to second stage dissolution; dissolution rate of alumina in clinker is 91.37%, dissolution rate of sodium oxide is 95.17%, Al in crude liquid 2 o 3 195.05g / l, Na 2 o k 166.66g / l. The obtained slurry was settled at a temperature of 100°C. After 60 minutes, the liquid-solid ratio of the underflow compression was 3.78, and the concentration of the supernatant float was 1.70g / l. At the same time, the coarse slag, which accounted for 82.01% of the total slag, settled to the settling tube within 1 minute....
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