... after gold concentrate remove iron scrape by regrinding and magnetic separation, remove agents by thickening, adding water,sulfuric acid and ... takes 4-6 days,Oxidized slurry to process solid- liquid separation by removing of iron scrap,graphite carbon and thickening,washings ... takes 4-6 days,Oxidized slurry to process solid- liquid separation by removing of iron scrap,graphite carbon and thickening, ...