Significant influence of self-possessed moisture of limonitic nickel laterite on sintering performance and its action mechanism
褐铁镍红土自有水分对烧结性能的显着影响及其作用机理
褐鉄鉱ニッケルラテライトの自己保有水分が焼結性能とその作用機序に及ぼす重要な影響
라모나이트 니켈 라테라이트의 자체 보유 수분이 소결 성능 및 그 작용 메커니즘에 미치는 중요한 영향
Influencia significativa de la humedad propia de la laterita de níquel limonítico en el rendimiento de la sinterización y su mecanismo de acción
Influence significative de l'humidité propre de la latérite de nickel limonitique sur les performances de frittage et son mécanisme d'action
Текст научной работы на тему «Значительное влияние самоудерживающейся влаги лимонитового никелевого латерита на характеристики спекания и механизм его действия»
Yu-xiao Xue 薛钰霄 ¹, De-qing Zhu 朱德庆 ¹, Jian Pan 潘建 ¹, Zheng-qi Guo 郭正启 ¹, Hong-yu Tian 田宏宇 ¹, Gen Li 李根 ¹, Qing-zhou Huang 黄庆周 ², Liao-ting Pan 潘料庭 ², Xue-zhong Huang 黄学忠 ²
¹ School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China
中国 湖南 长沙 中南大学资源加工与生物工程学院
² Guangxi Beibu Gulf New Material Co., Ltd., Beihai, 536000, Guangxi, China
中国 广西 北海 广西北港新材料有限公司
Journal of Iron and Steel Research International, 1 January 2022
Abstract
In consideration of the abundant moisture of limonitic nickel laterite mined, it is essential to determine whether the self-possessed moisture of limonitic nickel laterite after pre-dried is appropriate for sintering. Thus, based on the characterization of limonitic nickel laterite, the influence of its self-possessed moisture on sintering performance was expounded by sinter pot tests and the relevant mechanism was revealed by the systematical analyses of the granulation properties of sinter mixture, thermodynamic conditions during sintering and mineralogy of product sinter.
The results indicate that the self-possessed moisture of limonitic nickel laterite indeed has significant influence on its sintering performance. At the optimum self-possessed moisture of 21 mass%, sinter indices are relatively better with tumble index, productivity and solid fuel rate of 48.87%, 1.04 t m−2 h−1 and 136.52 kg t−1, respectively, due to the superior granulation properties of sinter mixture and thermodynamic conditions during sintering, relatively large amount of silico-ferrite of calcium and alumina and tighter sinter microstructure.
However, sintering performance of limonitic nickel laterite is still much poorer than that of ordinary iron ores. It is feasible to strengthen limonitic nickel laterite sintering by inhibiting the over-fast sintering speed and improving the thermodynamic conditions during sintering.
