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氟硅酸钾容量法已广泛用于矿石、耐火材料等物料中二氧化硅的测定。本法在此基础上系统地研究了容量法测定铝合金中硅的各种条件,拟定在4.5N硝酸介质中沉淀氟硅酸钾,以12%氯化钾-0.1%氟化钾(pH6.7—7.0)混合液洗涤氟硅酸钾沉淀至中性。铝合金中的常见元素(毫克):铝(185)、铁(1)、铜(7)、镁(12)、锌(13)、锰(1)、钛(0.3)、RE(1)均不干扰硅的测定。方法适合铝合金中3%以上硅的分析。从标准回收试验及对ZL型、ZAl-Si
Potassium fluorosilicate capacity method has been widely used in ore, refractory and other materials in the determination of silica. Based on this method, this method systematically studies various conditions for the determination of silicon in aluminum alloy by volumetric method. It is proposed that potassium fluosilicate is precipitated in 4.5N nitric acid medium, with 12% potassium chloride -0.1% potassium fluoride (pH6). 7-7.0) The mixture was washed with potassium fluosilicate precipitated to neutral. Common elements in the aluminum alloy (mg): Aluminum (185), Iron (1), Copper (7), Magnesium (12), Zinc (13), Manganese (1), Titanium (0.3), RE Do not interfere with the determination of silicon. The method is suitable for the analysis of over 3% silicon in aluminum alloy. From the standard recovery test and ZL type, ZAl-Si