What medium is most effective for scrubbing the exhaust gases generated in the polysilicon production process?
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What medium is most effective for scrubbing the exhaust gases generated in the polysilicon production process? The prerequisite is that wastewater treatment must achieve zero discharge. Which is more suitable for waste gas scrubbing: water, sodium hydroxide, or calcium hydroxide? Please give your strong support, fellow sailors!
Try it all, right? You need to experiment on your own.
It’s not just about the better leaching effect; what’s more important is to consider the cost!
Why isn’t anyone saying anything? Considering everything, it’s more cost-effective to use a calcium hydroxide solution for washing!
Reply 1# fangqiong: Water is enough
Reply to 5# duojinggui999: The wastewater you generate still needs to be neutralized. Moreover, in acidic conditions, HCl will be released into the atmosphere, which is not acceptable given the growing awareness of environmental protection.
Water will do, NaOH will work too
Washing, with appropriate use of sodium hydroxide during the treatment process
Use sodium hydroxide! Incomplete washing. The solubility of cA0H is too low
When using water, the addition of other substances can easily cause blockages in the nozzles of the scrubbing tower; the wastewater resulting from the scrubbing process also needs further treatment. The alkali used for neutralization can be added in subsequent steps.
Now many people say it’s better to wash it with water; I haven’t tried it. Sodium hydroxide is still the better choice; as long as the concentration is well controlled and the temperature isn’t too high. It’s better not to use calcium hydroxide; if it’s not washed, it tends to precipitate.