Diffusion dialysis
| Item (unit) |
Waste acid |
Recovered acid solution |
Deacidified solution |
| HNO3 (g/L) |
150.0 |
131.0 |
15.0 |
| HF (g/L) |
24.0 |
14.0 |
9.9 |
| Fe (g/L) |
20.0 |
1.6 |
19.0 |
| HNO3recovery rate (%) |
90 |
| HFrecovery rate (%) |
60 |
| Fe leakage rate (%) |
8 |
|
・Enable to achieve high acid recovery rate.
Electrodialysis
| Item (unit) |
Waste acid |
Recovered acid solution |
Deacidified solution |
| H2SO4 (g/L) |
175 |
176 |
20 |
| Al (g/L) |
17.0 |
1.5 |
20.2 |
| Acidrecovery rate (%) |
91 |
|
Al leakage rate
(%) |
8 |
|
・Enable to achieve high acid recovery rate.
・Enable to recover acid keeping concentration.
Diffusion dialysis
| Item (unit) |
Waste acid |
Recovered acid solution |
Deacidified solution |
| H2SO4 (g/L) |
350 |
278 |
70 |
| HCl (g/L) |
30 |
27 |
3 |
| Al (g/L) |
10 |
0.3 |
9 |
| Solution amount (m3) |
50 |
48 |
52 |
|
Al leakage rate
(%) |
3 |
|
Electrodialysis
| Item (unit) |
Deacidfied solution by diffusion dialysis |
Recovered acid solution |
Ultimate Deacidified solution |
| H2SO4 (g/L) |
70 |
147 |
7 |
| HCl (g/L) |
3 |
2 |
1 |
| Al (g/L) |
9 |
0.6 |
9 |
| Solution amount (m3) |
52 |
23 |
46 |
| Al leakage rate (%) |
3 |
|
・Enable to achieve high acid recovery rate.
Electrodialysis
| Item (unit) |
Alkali waste solution |
Recovered alkaline solution
|
Dealkalized solution |
| NaOH (g/L) |
40 |
146 |
4 |
| Solution amount (L) |
1,000 |
250 |
880 |
| Alkali recovery rate (%) |
91 |
|
・A high alkali recovery rate can be accomplished.
・Concentrated alkali recovery can be accomplished.
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