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铁矿石是钢铁工业的基础原料,地质勘探和矿石的选冶都需要了解其主要组分铁的含量。在铁矿石中全铁测定的方法很多,国内外主要采用二氯化锡还原,即重铬酸钾容量法。该方法所用的二氯化汞对操作人员健康有害,严重污染环境,故近几年来,国内外都在积极探索无汞测铁的方法,其中有(1)氧化还原法:用氯化亚锡、三氯化钛、抗坏血酸滴定Fe~(+3)离子,重铬酸钾,硫酸高铈滴定Fe~(+2)离子,氯化亚锡,三氯化钛、金属作还原剂。(2)络合滴定法:用2—羟基乙酮作指示剂,CYOTA滴定;用水杨酸作指示剂,NTA滴定;用磺基水杨酸(搔洛铬壳紫KS)作指示剂,EDTA滴定;其他还有电位、电导、离子选择性电极等方
Iron ore is the basic raw material for the steel industry. Both geological prospecting and ore dressing and smelting need to know the iron content of its main component. Determination of iron in iron in many ways, mainly at home and abroad using tin dichloride reduction, that is, potassium dichromate capacity method. Mercury chloride used in this method is harmful to the health of operators and seriously pollutes the environment. Therefore, in recent years, both domestic and foreign countries are actively exploring methods for mercury-free determination of iron, among which (1) redox method: using stannous chloride , Titanium trichloride, ascorbic acid titration Fe ~ (+3) ions, potassium dichromate, titration Fe ~ (+2) ions of ceric sulfate, stannous chloride, titanium trichloride and metal as reducing agent. (2) complexation titration: 2-hydroxyethanone as indicator, CYOTA titration; salicylic acid as indicator, NTA titration; sulfosalicylic acid (scratched chrome purple shell KS) as an indicator, EDTA Titration; other potential, conductivity, ion selective electrode and other parties