硫酸铁铵滴定法测定高钛型高炉渣中的钛

针对高炉渣反应活性差、熔样困难等特点,采用将炉渣粒度球磨至120目以下,硼酸和碳酸钠(2+1)作熔剂,900℃下熔融20 min,在瓷坩埚中铺垫石墨的方式来代替铂坩埚熔融样品,然后用硫酸(φ=10%)加热浸取熔块,铝还原Fe3+消除干扰,最后用硫酸铁铵滴定法测定钛含量。该方法用于高炉渣中钛的测定,相对标准偏差RSD(n=5)为0.41%~0.75%,加料回收率为98.6%~101.5%,能满足测定要求。

Determination of titanium content in high-Ti-bearing blast-furnace slag with ammonium ferric sulfate titration

For low activity and the poor solubility of BF slag, the BF slag is treated by ballmilling to make the particle size is less than 120 meshes. Using boric acid and sodium carbonate （2＋1） as fusing reagents, paving graphite in the porcelain crucible instead of platinum crucible as fusing vessel, the BF slag was melted 20min at 900℃, then leached with sulfuric acid （φ= 10% ） under the condition of heating. This method gives satisfactory results with a relative standard deviation （n=5） of 0.41%-0.75% and recovery of standard addition of 98.6%-101.5% for determining the content of titanium of the standard sample. So it can meet the requirement of determination.