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| 4.The introduction of remove dust and desulfurize by industrial waste gas |
| 1.Technological selection |
| (1) Conditioning of dust |
| (2) SO2 treatment |
| The following techniques can be chosen: |
| A. Lime/limestonebased process |
| B. Ammonia process |
| C. Soda process |
| D. Double alkali process |
| E. Metal oxide absorption process |
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| (3) H2S treatment |
| A. Liquid absorption process |
| B. Absorption oxo process |
| (4) HF treatment |
| A. Water absorption process |
SiF4+2H2O  2HF+SiO2
2HF+SiF4 H2SiF6
3SiF4+2H2O 2H2SiF2+SiO2 |
| B. Alkali absorption process |
| (5) NOx treatment |
A. Water absorption process |
B. Dilute nitric acid absorption process |
C. Alkaline solution absorption process |
D. Oxidation-absorption process |
E. Absorption-reduction process |
| F. Complexation absorption process |
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| (6) Other waster gas |
