A comprehensive study on the influence of pH for dewatering performance and filter cake characteristics in solid–liquid separation of clean coal

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-02-21 DOI:10.1016/j.seppur.2025.132208

Zeyu Feng, Ruxia Chen, Xianshu Dong, Yuping Fan, Xiaomin Ma

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Abstract

The pH of solution significantly influences the interplay between polymer flocculants and clean coal, thereby affecting dewatering performance. Herein, a comprehensive study on the influence of pH for dewatering performance of clean coal was investigated from the perspectives of particle interaction and filter cake structure. The results reveal that as the solution transitions from acidic to alkaline, the filtration rate diminishes and the cake moisture content elevates, regardless of flocculant presence. Atomic Force Microscope (AFM) measurements indicated a reduction in the adhesion force of particles as the pH increases. CT analysis demonstrated that the filter cake porosity at pH 4 is markedly greater than those at pH 7 and 10. Upon reaching a pH of 10, the cake porosity further decreases to 5.41%, while the ratio of isolated pores to total pores increases to 17.15%. In acidic environments, the development of pore space in filter cake is more uniform and well connected, which indicates a substantially lower capillary pressure compared to that at pH 7 and pH 10. The Lattice Boltzmann Method (LBM) simulation results indicate that the permeability of the cake formed at pH 10 is notably lower than that of pH7 and pH4.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.