Hu Shaoyan, Wang Deyong, Li Xianglong, Zhao Wei, Qu Tianpeng, Wang Yun
School of Iron and Steel, Soochow University, Suzhou 215137, China.
China ENFI Engineering Co., Ltd., Beijing 100038, China.
Materials (Basel). 2021 Aug 30;14(17):4937. doi: 10.3390/ma14174937.
Concentrating the chromium in chromium slag and improving the chromium-iron ratio is beneficial for the further utilization of chromium slag. In this paper, chromium slag obtained from a chromite lime-free roasting plant was used as the raw material. Pellets made of the chromium slag and pulverized coal were reduced at different pre-reduction temperatures and then separated by a melting separation process or magnetic separation process, respectively. The mass and composition of the metallized pellets before separation, along with the alloy and tail slag after separation, were comprehensively analyzed. The experimental results showed that the output yield of alloy, iron recovery rate, and chromium content in the alloy were all higher when using melting separation than when using magnetic separation, because of the further reduction during the melting stage. More importantly, a relatively low pre-reduction temperature and selection of magnetic separation process were found to be more beneficial for chromium enrichment in slag; the highest chromium-iron ratio in tail slag can reach 2.88.
将铬渣中的铬进行富集并提高铬铁比有利于铬渣的进一步利用。本文以某铬铁矿无钙焙烧厂的铬渣为原料。由铬渣和煤粉制成的球团在不同的预还原温度下进行还原，然后分别通过熔融分离工艺或磁选工艺进行分离。对分离前金属化球团的质量和成分以及分离后的合金和尾渣进行了综合分析。实验结果表明，由于在熔融阶段的进一步还原，采用熔融分离时合金的产出率、铁回收率和合金中的铬含量均高于采用磁选时。更重要的是，发现较低的预还原温度和选择磁选工艺对渣中铬的富集更为有利；尾渣中的最高铬铁比可达2.88。
