7.5tⅠ型炉海绵钛真空蒸馏生产工艺研究

Study on Vacuum Distillation of Titanium Sponge Using 7.5-ton Scale I-type Furnace

结合半联合Ⅰ型炉海绵钛生产工艺特点,分别讨论了真空度、蒸馏温度、蒸馏负荷、喷淋水制度对海绵钛真空蒸馏的影响。蒸馏罐较高的真空度和较佳的气密性、较小的蒸馏负荷、直接将蒸馏电炉升温至960~1 020℃,有利于提高真空蒸馏速率及缩短蒸馏周期。除此之外,以冷凝罐上部真空度突然下降作为蒸馏通道开启判断标志,并分阶段调控喷淋水温度,有效解决了Ⅰ型炉因冷凝罐内Mg及MgCl_2发生气-液-固三相转变而带来的Ⅰ型炉蒸馏效率下降及蒸馏通道堵塞问题。

This paper respectively discussed the influences of vacuum level, distillation temperature, distillation load and spray water system on vacuum distillation process of titanium sponge, according to the characteristics of titanium sponge production by half-combined Ⅰ-type furnace. A higher vacuum level and better gas tightness of the alembic, a smaller distillation load and directly heating the furnace to 960 - 1 020 ℃ are favorable for increasing the evaporation rate and shortening the distillation period. In addition, by using the sudden decline of vacuum degree in the top of condenser tank as the judgment for vacuum distillation channel opening and adjusting the temperature of spray water periodically, the distillation efficiency decrease and distillation channel blocking of Ⅰ-type furnace which are caused by the gas-liquid -solid phase transformation of Mg and MgCl2 in condenser tank are efficiently resolved.