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分析了传统方法中存在的问题及原因；报道了采用微机技术控制和采集实验数据、绘制冷却曲线，用电磁搅拌代替手动搅拌等新方法，并摸索了最佳实验条件．新法操作简便、结果理想．
The problems and causes existing in the traditional methods were analyzed. Some new methods such as controlling and collecting experimental data by microcomputer, plotting the cooling curve, replacing the manual stirring with electromagnetic stirring were reported and the optimum experimental conditions were explored. The new method is simple and the result is satisfactory.