Enhancing Rotary Kiln-Electric Furnace Process of Saprolitic Laterite from the Viewpoint of Slag Optimization to Minimize Energy Consumption
Enhancing Rotary Kiln-Electric Furnace Process of Saprolitic Laterite from the Viewpoint of Slag Optimization to Minimize Energy Consumption
复制标题
DOI：
10.1007/s40831-023-00769-z
复制
发表时间：
2023-11
影响因子：
2.4
通讯作者：
De‐qing Zhu;Xiaofeng Xu;Jian Pan;Xin Wang;Cong-cong Yang;Zheng-qi Guo;Si-wei Li;Hongyu Tian
中科院分区：
文献类型：
--
作者：
De‐qing Zhu;Xiaofeng Xu;Jian Pan;Xin Wang;Cong-cong Yang;Zheng-qi Guo;Si-wei Li;Hongyu Tian
How to reduce the energy consumption of the rotary kiln-electric furnace (RKEF) process has become an important issue for the stainless steel industry. The aim of this study is to reduce the energy consumption of ferronickel production from saprolite nickel laterite in the RKEF process. The effects of the slag binary basicity, FeO content, and Cr2O3content on the melting temperature and electric conductivity of the slag as well as the effects of coal dosage, smelting temperature, smelting time, and binary basicity on the smelting process, within the new slag system of CaO–MgO–SiO2–Al2O3–FeO–Cr2O3, have been systematically investigated. It was found that properly increasing the binary basicity and FeO content of slag tends to lower smelting temperature and higher electrical conductivity, while decreasing the Cr2O3content is beneficial to decreasing the melting temperature of slags as well as the electrical conductivity. Through the optimization of slag composition and smelting parameters, ferronickel with 22.11% Ni, 77.24% Fe, and 0.08% Cr can be obtained at corresponding recovery rates of 99.17%, 28.01%, and 0.54%, respectively, under the conditions of 0.2 binary basicity, coal dosage of 14% at 1550 °C for 30 min based on the guidance of 9.4% CaO-18.2% MgO-47% SiO2-3.4% Al2O3-20% FeO-2.0% Cr2O3slag system. In addition, the main phase composition of slags obtained is mainly composed of forsterite, hortonolite, enstatite, diopside, and melilite, which have a lower melting point than contrast the slag from industrial production site with the main phase of pyroxene and magnesioferrite olivine. So, the new slag system is helpful for reducing the temperature and time of smelting, and reducing the energy consumption of the RKEF process.Graphical Abstract
