【摘要】 提供一个快速测定赤铁矿中CaO和MgO的新方法,在用碳酸钠和碳酸钾混合熔剂半融熔后,在2N硝酸中煮沸1.5小时以抽取钙、镁,分出不溶的Fe₂O₃和溶解的少量铁、铝等以后用0.01M EDTA标准溶液滴定CaO、MgO总量。用草酸盐分离钙,用EDTA溶液滴定CaO含量,另用地旦黄比色法测定MgO分量。两个方法测定结果相符合,比色法较快,完成一个试样分析只需3—4小时。用本法（容量法测定CaO）分析苏联标准铁矿试样,结果完全符合。更多还原

【Abstract】 A rapid method for the determination of CaO and MgO in Hematite is proposed. The sample sintered with a mixture of Na2CO3 and K.2CO3 and boiled in 2N HNO3 to dissolve the Lime and Magnesia. The extract is treated with urea to precipitate the small amount of Iron dissolved. The sum of CaO and MgO is determined by titration with ethylenediamine tetracetic acid (disodium salt). Lime is determined after precipitation as the oxalate and MgO is found by difference. Or alternatively, Magnesia is determined colorimetrically with titan yellow and Lime by difference. The results of both methods agree each other. The colorimetric method is more rapid, and requires about 3-4 hours. Analysis of standard sample of hematite give very good results.更多还原