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在大陶缸中放入适量的清水,搅拌下缓慢加入浓硫酸,配成浓度21%～25%的稀硫酸。按铁:硫酸=56:98的重量比例,向稀硫酸中搅拌下缓慢加入过量的铁屑。待反应停止,趁热过滤,将滤液冷却至室温,静置。完全结晶后,滤取晶体,用清水冲洗2次,得浅绿色七水硫酸亚铁。
In the large pot into the right amount of water, stirring slowly add concentrated sulfuric acid, dubbed the concentration of 21% to 25% of the dilute sulfuric acid. Press iron: sulfuric acid = 56: 98 weight ratio, stirring slowly into the dilute sulfuric acid excess iron scrap. When the reaction stopped, filtered while hot, the filtrate was cooled to room temperature and allowed to stand. After completely crystallized, the crystals are collected by filtration and rinsed twice with clear water to obtain light green heptahydrate ferrous sulfate.