Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation

查看全文 作　　者：lun-wei [1]wang;xue-ming [1]lü;mei [2]liu;zhi-xiong [1]you;xue-wei [1]lü;chen-guang [1]bai

机构地区：[1]college of materials science and engineering,chongqing university,Chongqing 400044,China;[2]engineer of cisdi thermal&environmental engineering co.,ltd.,Chongqing 401122,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2018年第25卷第7期,共8页

基　　金：the National Natural Science Foundation of China(No.51234010);the Fundamental Research Funds for Central Universities(No.106112017CDJXY130001)for the financial support provided for this research 摘　　要：The sticking phenomenon between molten slag and refractory is one of the crucial problems when preparing ferronickel from laterite ore using rotary hearth furnace or rotary kiln processes. This study aims to ameliorate sticking problems by using silicon dioxide(SiO_2) to adjust the melting degree of the briquette during reduction roasting. Thermodynamic analysis indicates that the melting temperature of the slag gradually increases with an increase in the SiO_2 proportion(SiO_2/(SiO_2 + Al2 O3 + Mg O) mass ratio). Experimental validations also prove that the briquette retains its original shape when the SiO_2 proportion is greater than 75 wt%, and sticking problems are avoided during reduction. A ferronickel product with 8.33 wt% Ni and 84.71 wt% Fe was prepared via reductive roasting at 1500°C for 90 min with a SiO_2 proportion of 75 wt% and a C/O molar ratio of 1.0 followed by dry magnetic separation; the corresponding recoveries of Ni and Fe reached 75.70% and 77.97%, respectively. The microstructure and phase transformation of reduced briquette reveals that the aggregation and growth of ferronickel particles were not significantly affected after adding SiO_2 to the reduction process. 关键词：煤饼红土分离磁性 SIO2 二氧化物镍热力学

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Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation

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