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铁矿石中碳酸铁(指菱铁矿及钙、镁、锰、铁互相置换的方解石型、白云石型矿物)的测定已有多种分析方法,本文仅对应用较广泛的三氯化铝法在测定时可能引入的误差因素进行探讨,着重讨论共存矿物的干扰,并用10个试样的测定结果进行误差统计,借以说明应用此法可允许的偶然误差范围。 一、浸取条件及纯矿物试验 本法的两个浸取条件: 1.AlCl_3法:10％三氯化铝(六结晶水)100ml,沸水浴中浸取1小时,重铬酸钾法滴定浸取液中亚铁(溶液颜色深者,可迅速冷却后过滤,滴定滤液中亚铁)。
There are a variety of analytical methods for the determination of iron carbonate in the determination of iron carbonate (siderite and calcite, dolomite minerals substituted for calcium, magnesium, manganese and iron). This article only applies to the more general aluminum trichloride The possible error factors introduced by the method are discussed. The interference of coexisting minerals is mainly discussed. The error statistics of the results of 10 samples are used to illustrate the range of accidental errors that can be applied by this method. First, the leaching conditions and pure mineral test The two conditions of the leaching: 1.AlCl_3 method: 10% aluminum trichloride (six crystal water) 100ml, leaching in boiling water bath for 1 hour, potassium dichromate method titration Leaching solution of ferrous (solution darker, can be rapidly cooled after filtration, titration filtrate ferrous).