"用硫酸处理" can be translated as "treat with sulfuric acid" or "process with sulfuric acid" in English, depending on the context.
"Treat with sulfuric acid" emphasizes the action of applying sulfuric acid to something for a specific purpose, such as in a chemical reaction or purification process.
"Process with sulfuric acid" implies a more systematic or industrial use of sulfuric acid in a manufacturing or treatment procedure.