真空碳热还原提取金属镁过程中菱镁矿热分解行为的实验研究  

Study on the thermal decomposition behavior of magnesite in carbothermic reduction extraction process for magnesium in vacuum

作　　者：裴红彬[1] 徐宝强[1,2,3] 李一夫[1,2,3] 杨斌[1,2,3] 郁青春[1,2,3] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]昆明理工大学真空冶金国家工程实验室,云南昆明650093 [3]云南省有色金属真空冶金重点实验室,云南昆明650093

出　　处：《轻金属》2010年第1期46-50,共5页Light Metals

基　　金：昆明理工大学学生课外学术科技创新基金(2008BA006);NSFC-云南省有色基金(U0837604);昆明理工大学人才培养基金项目(2008-06)

摘　　要：针对真空碳热还原菱镁矿提取金属镁的过程,直接将菱镁矿、煤粉和萤石按一定比例配料后,经球磨、混匀、压团,得到Φ20mm×15mm的块状混合原料。在20Pa^100Pa的压强下,分别控制不同温度、不同时间考察了混合原料中菱镁矿的热分解行为,其分解对还原剂碳的影响以及混合原料的焦结情况。结果表明,混合原料中菱镁矿在873K,30min的条件下可以完成分解过程,且该条件下分解后的物料具有较好的焦结强度。因此,采用菱镁矿、煤粉和萤石直接混合后入真空炉完成真空热分解-焦结工艺从技术上是可行的,可明显缩短流程。实验分析表明在菱镁矿的真空热分解同时由于伴随着布多尔反应会造成还原剂碳的损失。With regard to the carbothermic reduction process for extracting metal magnesium from magnesite in vacuum, the thermal decomposition be havior of magnesite in mixture, its effect on reductant carbon in coal and decomposition products＇ coking property were investigated at different temperatures and different time under the pressure of 20Pa-- 100Pa, respectively. The magnesite, coal and calcium fluoride were mixed at a certain proportion. After milling, blending, end forming, the column reaction mass of Ф20mm×15mm was obtained, then it was charged in vacuum furnace and the decomposition process of magnesite started. The result indicates that the decomposition process of magnesite in mixture finished at 873K and 30min, and the production have good coking property which means it is feasible technicaUy the procedures can shorten carbothermic reduction process and reduce energy consumption for extraction metal magnesium from magnesite. But Boudol reaction happened during decomposition process of magnesite resulted in loss weight of reductant carbon.

关 键 词：真空冶金 热分解 碳热还原 焦结 菱镁矿 

分 类 号：TF822[冶金工程—有色金属冶金]