Enhancing supergravity separation performance of oil shale using sodium carboxymethyl cellulose as a dispersant

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-21 DOI:10.1016/j.powtec.2025.120826

Lingtao Zhu , Jingfeng He , Bin Yang

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引用次数: 0

Abstract

Currently, efficient separation of fine-grained oil shale using gravity separation method is challenging due to particle agglomeration. In this study, sodium carboxymethyl cellulose (CMC-Na) was employed as a dispersant to enhance the separation of fine-grained oil shale through supergravity separation. Supergravity separation experiments and XPS analysis revealed that the addition of CMC-Na significantly improved the recovery of combustible matter in oil shale. Settlement tests and particle size distribution analysis had shown that oil shale particles exhibited better dispersion in the CMC-Na solution. Furthermore, contact angle measurements and zeta potential analyses indicated that CMC-Na enhanced the wettability of oil shale particle surfaces and increased electrostatic repulsion between particles, thereby reducing particle agglomeration and entrainment. Consequently, at a centrifugal speed of 500 rpm, the use of CMC-Na as a dispersant facilitated the pre-enrichment of oil shale, effectively increasing the combustible recovery rate by 10.35 %. This study provides an effective method for the separation and improvement of fine-grained oil shale.

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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.