- The ore was heated in the kilns to drive off water and carbonic acid gas.
- Acidic gas or water can also ruin the monolith.
- The damage of high temperature,moisture and acid gases to cultural relics is known to all.
- The common method of removing acid gases are application of caustic soda solution or caustic pellets.
- The cure characteristics of STW, which was removed from acid gas ,was researched.