Is there a significant difference in the amount and impurity composition of the acidic waste generated by washing and pickling?
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Currently, the exhaust gases generated in zinc roasting are mostly recovered for the production of sulfuric acid. After dust removal, the flue gas enters the washing stage; the commonly used methods are water washing and acid washing (with 20%–30% sulfuric acid). I would like to ask the experts: is there a difference in the amount of acidic waste generated by the water washing and acid washing processes? Are there any significant differences among the various impurity categories? Thank you!
Basically the same; it’s all about enrichment
Oh, thank you! May I ask another question? When it comes to choosing between water washing and acid washing in the industry, what are the typical considerations? What are the advantages and disadvantages of washing with water and acid cleaning? Thank you!
Washing leads to better health: lol, you can read books on this topic.
Okay, I’ll search on Baidu; if I have any questions, I’ll ask again
The industry mostly uses water washing. By water washing, water is used during the first operation; after the washing solution circulates once, it dissolves sulfur trioxide from the flue gas, causing the solution to become acidic – that is what is meant by dilute acid washing. At present, the vast majority of acid production and purification systems for smelting flue gas rely on dilute acid washing. As for the yield of acidic waste, it is determined through balancing factors such as the dust content in the flue gas. The acidity of the dilute acid used for washing is generally between 5% and 10%; in some companies, in order to reduce the amount of dilute acid, the circulation process is intensified to increase its concentration to nearly 20%, depending mainly on the balance of dust and other ions present.