I’m working on the problem of copper smelter slag processing by leaching. 

What I’m interested in is the details about the process of leaching copper slag with sulfuric acid and hydrogen peroxide that has been described in (Hydrometallurgy 67 (2002) 63–69).

Could you please specify the reasons that prevent silica gel formation when using H2O2?

What is the practical importance (significance) of the reaction of FeOOH formation?

Thank you for your attention to my question.