碳镁球团复合脱氧脱硫剂中CaO、MgO、SiO2的测定

摘要

The sample is melt by alkaline flux, then leached and acidized by diluted hydrochloric acid and constant volume. A part of testing solution is taken, and the acidity of each element is controlled by regulation during analysis. By the logarithm difference of 5.8 between calcium/magnesium and EGTA complex constant, in the presence of Mg, the content of Ca may be titrated by EGTA to shelter Ca at the same time, then CyDTA is used to titrate Mg, then the content of SiO2 is determined by silicon molybdenum blues photometry, realizing the fast analysis of MgO, CaO and SiO2 by the same mother solution. By this method, the determination of MgO, CaO and SiO2 in carbon-magnesia pellet is carried out, and the result is satisfactory and the RSDs are less than 0.24%(MgO), 2.82%(CaO) and 2.93%(SiO2) respectively.%试样用碱熔剂熔融，稀盐酸浸取酸化、定容。移取部分试液，通过调节控制分析时各元素的酸度，利用钙镁与EGTA络合常数的对数相差5.8，在镁存在的情况下，用EGTA直接滴定钙，以EGTA掩蔽钙后，用CyDTA直接滴定镁，再用硅钼蓝光度法测定SiO2量，实现了CaO、MgO、SiO2同一母液联合快速分析。应用本法对碳镁球团中的MgO、CaO、SiO2进行测定，结果满意，RSD分别≤0.24%、2.82%和2.93%。