铬铁矿无钙焙烧过程中氧含量对氧化率的影响

Effect of oxygen content on oxidation ratio of chromium in lime free roasting process

在不同的氧含量下,通过改变焙烧温度、焙烧时间、填料(废渣)添加量及配碱率等实验条件,分析各因素对铬氧化率的影响趋势。实验结果表明,高氧含量可以提高铬氧化率,是重要的影响因素。氧含量为40%(体积分数)左右较为合理;合理的焙烧温度和时间分别为1 100℃和60 min;应结合铬铁矿中的铬的最大氧化率和炉料阈值来确定填料的用量;配碱率的增加在提高了铬氧化率的同时,也降低了碱利用率,配碱率低于1.4时对铬氧化率影响较大。

With different reaction times,reaction temperatures,and addition amounts of filler （ solid residue） and soda, the influencing trend of various factors on oxidation ratio of chromium were studied under different oxygen contents. Experi- mental results indicated that, oxygen content was an important factor and oxidation ratio of chromium could be improved with higher oxygen content. Proper oxygen content was about 40% （ volume fraction ） ; proper reaction temperature and time were 1 100℃ and 60 min respectively;the best amount of filler should be confirmed according to the highest chromium＇s oxidation ratio of chromite and furnace burden threshold. Increasing addition of soda could raise oxidation ratio of chromium, but led to low utilization ratio of soda. Soda had obvious impact on oxidation ratio of chromium when usage ,＇ate was below 1.4 .