Consolidation mechanism of oxidized pellets with composite laterite nickel ores

IF 5.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2026-04-01 Epub Date: 2025-12-22 DOI:10.1016/j.powtec.2025.122059

Chen Xing , Guo Zhengqi , Zhu Deqing , Pan Jian , Li Siwei , Yang Congcong

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Abstract

As one of the main sources of ferronickel, laterite nickel ore faces the challenge of efficient utilization, mainly because of its complex chemical composition derived from diverse ore types. In this study, an innovative approach of mixing three different types of laterite nickel ores for pelletizing and roasting was proposed. The effects of basicity and roasting temperature on pellet mechanical strength were systematically investigated. The consolidation mechanism was revealed from multiple perspectives, including phase composition, porosity, microcracks, and liquid phase formation, and the evolution of nickel-bearing phases was also clarified. The results show that the pellets achieved optimal strength when the basicity was 0.2 and the roasting temperature was 1275 °C. This was mainly attributed to the formation of diopside, which lowered the melting point, decreased the porosity and promoted densification of the pellet structure. However, excessive basicity led to much more liquid phase generation, and abundant microcracks, thereby reducing the pellet strength. In addition, an appropriate amount of CaO destroyed the structure of augite, released the nickel contained therein, enhanced nickel enrichment, and facilitated the subsequent reduction process.

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红土镍矿复合氧化球团的固结机理

红土镍矿是镍铁的主要来源之一，其化学成分复杂，矿石类型多样，面临着高效利用的挑战。本文提出了一种将三种不同类型的红土镍矿混合成球焙烧的创新方法。系统研究了碱度和焙烧温度对球团机械强度的影响。从相组成、孔隙度、微裂纹、液相形成等多个角度揭示了固结机理，并阐明了含镍相的演化规律。结果表明：矿团在碱度为0.2、焙烧温度为1275℃时强度最佳；这主要是由于透辉石的形成降低了熔点，降低了孔隙度，促进了球团结构的致密化。然而，碱度过高导致液相生成过多，微裂纹丰富，从而降低了球团的强度。此外，适量的CaO破坏了奥辉石的结构，释放了其中所含的镍，增强了镍的富集，有利于后续的还原过程。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.