Abstract: A melting method of titanium content determination in rare earth ferrosilicon alloy using spectrophotometry with diantipyrylmethane，which mixed anhydrous sodium carbonate and boric acid to flux melting sample quickly at a high temperature was studied. The optimum condition of melting sample was investigated. The sample could be melted completely，with stable result and error in an allowable range，meeting the requirement of analysis. The method can quickly decompose ore sample to obtain accurate result，with advantages of environmental protection，quick，and adaptable to the batch analysis as compared with dissolving sample by using nitric acid and hydrofluoric acid. The optimum condition of melting rare earth ferrosilicon alloy was ratio of sample and mixed alkali 6∶1，ratio of sodium carbonate and boric acid 2∶1，and melting at 1000 ℃ for 20 min. The decreasing order of importance was ratio of sample and mixed alkali，melt time，melt temperature，and ratio of sodium carbonate and boric acid.

Key words: rare earth ferrosilicon alloy, spectrophotometry, melting, analysis

摘要： 研究了用二安替比林甲烷分光光度法测定稀土硅铁合金中钛含量时试样的熔融方法，即采用无水碳酸钠和硼酸混合熔剂在高温下快速熔融试样，并探索了试样熔融的最优条件。试验结果表明：溶样完全，测试结果稳定，误差在允许范围内，满足分析要求；该方法能快速分解矿样，测定结果准确，与采用硝酸和氢氟酸溶解矿样相比，具有环保、快速、适应批量分析等优点。熔融稀土硅铁合金试样的最优条件是混合碱与试样比6∶1，碳酸钠与硼酸比2∶1，熔融温度1000 ℃，熔融时间20 min；各因素影响的主次顺序为混合碱与试样比>熔融时间>熔融温度>碳酸钠与硼酸比。

关键词: 稀土硅铁合金, 分光光度法, 熔融, 分析