Wang Chao, Guo Yufeng, Wang Shuai, Chen Feng, Yang Lingzhi, Zheng Yu
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Materials (Basel). 2023 Jan 20;16(3):986. doi: 10.3390/ma16030986.
Vanadium tailings from vanadium extraction by a sodium roasting process are solid waste and cannot be used in sintering and ironmaking due to their high sodium content. In this paper, a calcification and reduction roasting process was proposed to remove sodium from vanadium tailings. The effects of Ca(OH) addition, reduction temperature, and roasting time on the sodium removal behavior and compression strength of pellets were studied. The addition of Ca(OH) and the reduction of iron oxides promoted the sodium-containing phases to transform to be simpler, which could enhance sodium removal. The sodium removal rate was up to 93.47% and the compression strength of the reduced products was 4497 N/P, and the metallized ratio of the product was higher than 70% under the optimal conditions: roasting at 1200 °C for 2 h with the Ca(OH) addition of 35%. The treated product after removing sodium can be recycled in the ironmaking process in a steel company.
采用钠化焙烧法提钒产生的钒尾矿属于固体废弃物，因其钠含量高而无法用于烧结和炼铁。本文提出了一种钙化还原焙烧工艺以去除钒尾矿中的钠。研究了氢氧化钙添加量、还原温度和焙烧时间对球团钠去除行为及抗压强度的影响。氢氧化钙的添加和铁氧化物的还原促使含钠相转变为更简单的相，从而提高钠的去除率。在最佳条件下：1200℃焙烧2小时，氢氧化钙添加量为35%，钠去除率可达93.47%，还原产物的抗压强度为4497N/P，产物的金属化率高于70%。脱钠后的处理产物可在钢铁企业的炼铁工艺中循环利用。
