Experimental studies on influencing factors of iron leaching rate in Pyrite cinder

Objective: To explore influencing factors of iron leaching rate on the dosage of sulfuric acid,solvent type and dosage,temperature and time in pyrite cinder,and obtain process conditions of the acid leaching.Methods: Pyrite cinder as the raw materials reacted with sulphuric acid directly,filtrate employing dichromate titration method was used to measure the content of iron,analysis of multiple single factor experiment was conducted and the change rule of iron ion leaching rate was obtained.Results: The experiment showed the influencing rule of sulfuric acid dosage,temperature,and the time on leaching rate of iron ion.Conclusion: Various factors of iron leaching rate has certain effect,and the optimum technological conditions of acid leaching are sulphuric acid concentration 4mol/L,sodium chloride as cosolvent and reaction with sulphuric acid ratio of 1︰20,reaction temperature 95 degrees and reaction time 2h.