CAJ | 학술논문

以南非铬铁矿为原料，以潞安煤粉为还原剂，进行了铬铁矿粉还原焙烧与磁选分离实验。借助扫描电镜、能谱分析和 X 射线衍射分析，对碳热还原和磁选分离过程中的物相变化进行了系统研究。实验发现，当温度低于1200℃时，铬铁矿仅发生少量铁氧化物的还原，当温度高于1300℃时，铬铁矿中铬氧化物开始被还原成碳化铬。随着还原反应的不断进行，铬铁尖晶石结构逐渐发生转变并被破坏。在本实验条件下，铬铁矿较为适宜的预处理温度为1200℃，此温度下的还原产物磁选后，磁选产物几乎全部为金属铁，磁选所得尾渣的除铁率为46％，铬的收得率为80％，w （Cr2 O3）／w （FeO）值高达3．75。研究工作对于铬铁矿预处理工艺的设计开发及低品位铬铁矿的综合利用具有理论指导意义。
이남비락철광위원료，이로안매분위환원제，진행료락철광분환원배소여자선분리실험。차조소묘전경、능보분석화 X 사선연사분석，대탄열환원화자선분리과정중적물상변화진행료계통연구。실험발현，당온도저우1200℃시，락철광부발생소량철양화물적환원，당온도고우1300℃시，락철광중락양화물개시피환원성탄화락。수착환원반응적불단진행，락철첨정석결구축점발생전변병피파배。재본실험조건하，락철광교위괄의적예처리온도위1200℃，차온도하적환원산물자선후，자선산물궤호전부위금속철，자선소득미사적제철솔위46％，락적수득솔위80％，w （Cr2 O3）／w （FeO）치고체3．75。연구공작대우락철광예처리공예적설계개발급저품위락철광적종합이용구유이론지도의의。
Reduction roasting and magnetic separation of chromite ore is investigated,using South African chromite ore as raw materials and Lu’an pulverized coal as reductant.The phase changes in the reduction and magnetic separation process is analyzed systematically by means of SEM‐EDS and X ray diffraction.The results show that only iron oxides in the chromite ore are reduced when the temperature is below 1 200 ℃, and chromium oxides are reduced into chromium carbide when the temperature exceeds 1 300 ℃.The spinel structure is transformed and destroyed gradually with the proceeding of reduction reaction.Under the considering experimental conditions,the appropriate temperature for pretreatment is 1 200 ℃,with an iron removal rate of 46%,a chromium yield rate of 80%,and a higher w (Cr2 O3 )/w (FeO)value of 3.75,the magnetic separation product is mainly iron.This work has great theoretical significance for the development of chromite ore pretreatment process and the comprehensive utilization of low‐grade chromite ore.