摘要
目前,中国大部分海绵钛生产企业采用外购TiCl4原料通过镁热还原法来生产海绵钛,但对该过程的副产物熔融氯化镁没有综合利用,氯化镁保存难度较大,从而造成资源、能源的浪费以及环境污染诸多问题。基于以上背景,我们提出以钛冶炼过程中蒸馏工序段熔融氯化镁为原料,在通氧条件下,熔融态氯化镁直接热解,得到产物氧化镁和氯气,氧化镁既可直接利用,也可用于分解制取镁,而氯气则可进入沸腾氯化工艺,从而实现钛生产过程中的镁氯循环以及副产物的综合利用。通过对反应热力学、热化学的计算以及实验模拟来确定气相反应的主反应器文丘里管的尺寸。文丘里管的尺寸设计为:收缩段长度为136 mm,扩压段长度为343 mm,喉口段长度为32 mm。喉口处引射口直径为25 mm。入口圆筒段长为100 mm,出口圆筒段的长度为30 mm。材质选用镍基合金高温材料MA956。
The magnesium thermal reduction method is the most conventional process for titanium sponge production with outsourced TiCl4 as raw material in China. However,due to the difficulty in Mg Cl2 storage and comprehensive utilization of by-products,it leads to series of problems in energy-saving and environment protection. Considering this situation,a novel process was proposed to utilize molten Mg Cl2 in distillation process in titanium metallurgy. The molten Mg Cl2 was directly pyrolyzed in O2 atmosphere,and then products of Mg O and Cl2 were obtained. The Mg O can be utilized directly or decomposed into Mg,and Cl2 can be used in boiling chlorination process. In this way,both Mg and Cl2 were utilized comprehensively. Based on the thermodynamic and thermochemistry calculation and experimental simulation,the size of main reactor,Venturi tube,was determined. The contraction section length was 136 mm,diffuser section length was 343 mm and throat section length was 32 mm. The injection port diameter was 25 mm at the throat section. The length of entrance cylindrical section was 100 mm and that of the export cylindrical section was 30 mm. The nickel-base alloy MA956 was chosen as the structural material.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2015年第7期623-629,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51374064
51004033
51074044
57304043)
中央高校基本科研业务经费项目(N130402012
N130702001)资助
关键词
熔融氯化镁
直接热解
热力学
文丘里管
molten magnesium chloride
direct pyrolysis
thermodynamics
Venturi tube
