Problems with sulfuric acid valves
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Question 1: Why is calcium sulfate present in 98% sulfuric acid? Question 2: Do carbon steel ball valves or PTFE-lined ball valves used for 98% sulfuric acid pipelines become difficult to open and close over time? Is it because calcium sulfate precipitates on the surface of the ball valve, creating surface tension? Question 3: What type of valves and what material should be used for 98% sulfuric acid?
1. In 98% acid, calcium sulfate may come into contact with calcium salts during transportation. 2/ The valves used for 98% acid can become difficult to operate over time, usually due to acid sludge. 3. If the temperature of 98% acid is not high, PTFE ball valves, stainless steel ball valves, or stainless steel gate valves should all work fine. 4. This is merely my personal opinion
The water quality of the dilution water added to the absorption tower can tell you
It is recommended to use Hastelloy material, mainly due to its resistance to strong acid corrosion
When raising this question, it is essential to specify the temperature of the medium. For sulfuric acid of the same concentration, different valve materials are required at different temperatures, as corrosion severity varies with temperature.