Pilot scale test of producing nickel concentrate from low-grade saprolitic laterite by direct reduction-magnetic separation
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：ZHENG Guo-lin(郑国林) ZHU De-qing(朱德庆) 潘建 LI Qi-hou(李启厚) AN Yue-ming(安月明) ZHU Jing-he(朱景和) 刘志宏
文章页码：1771 - 1777
Key words：low-grade saprolitic laterite; direct reduction; magnetic separation; pelletization; segmented grinding; nickel concentrate
Abstract: The enrichment of Ni from a low-grade saprolitic laterite ore, which has been pre-treated by high pressure grinding roller(HPGR) to be 74% passing 0.074 mm and contains 0.92% Ni, 18.47% Fe, 10.61% MgO and 42.27% SiO2, was conducted by using pelletizing, rotary kiln reduction and magnetic separation process on a semi industrial scale, and the effects of reduction duration, mass ratio of coal to pellets(C/P), the types of magnetic separator, the sections of grinding-separation and the grinding fineness on the recovery of Ni and Fe were examined. It is shown that nickel concentrate containing 3.13 % Ni and 59.20 % Fe was achieved at recoveries of 84.36 % and 71.51 % for Ni and Fe, respectively under the following conditions: reducing at (1120±40) °C for 120 min, C/P being 1.0, wet grinding of reduced pellets up to 70%-87% passing 0.074 mm and a magnetic field intensity of 238.8 kA/m during the first section of grinding-magnetic separation, and a grinding fineness of 84%-91% passing 0.045 mm and a magnetic intensity of 39.8 kA/m during the second section of grinding-magnetic separation. The enriched Ni containing concentrate has a low content of S and P, and can be used for further processing to produce high-grade ferronickel alloy.
ZHENG Guo-lin(郑国林)1, ZHU De-qing(朱德庆)1, PAN Jian(潘建)1, LI Qi-hou(李启厚) 2, AN Yue-ming(安月明)3, ZHU Jing-he(朱景和)3, LIU Zhi-hong(刘志宏)2
(1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
3. China Nonferrous Metal Mining(Group), Co., Ltd, Beijing 100029, China)
Abstract:The enrichment of Ni from a low-grade saprolitic laterite ore, which has been pre-treated by high pressure grinding roller(HPGR) to be 74% passing 0.074 mm and contains 0.92% Ni, 18.47% Fe, 10.61% MgO and 42.27% SiO2, was conducted by using pelletizing, rotary kiln reduction and magnetic separation process on a semi industrial scale, and the effects of reduction duration, mass ratio of coal to pellets(C/P), the types of magnetic separator, the sections of grinding-separation and the grinding fineness on the recovery of Ni and Fe were examined. It is shown that nickel concentrate containing 3.13 % Ni and 59.20 % Fe was achieved at recoveries of 84.36 % and 71.51 % for Ni and Fe, respectively under the following conditions: reducing at (1120±40) °C for 120 min, C/P being 1.0, wet grinding of reduced pellets up to 70%-87% passing 0.074 mm and a magnetic field intensity of 238.8 kA/m during the first section of grinding-magnetic separation, and a grinding fineness of 84%-91% passing 0.045 mm and a magnetic intensity of 39.8 kA/m during the second section of grinding-magnetic separation. The enriched Ni containing concentrate has a low content of S and P, and can be used for further processing to produce high-grade ferronickel alloy.
Key words:low-grade saprolitic laterite; direct reduction; magnetic separation; pelletization; segmented grinding; nickel concentrate
