Mechanical grinding modification for enhanced dewatering of coal gasification fine slag: pore structure regulation, water occurrence evolution, and factor effect analysis

XIAO Zongmu; CHEN Liqing; ZHANG Mingcheng; NIE Chengyuan; GAO Shengtao; ZHANG Yixin; WU Jianjun; GUO Fanhui

doi:10.11949/0438-1157.20260443

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Mechanical grinding modification for enhanced dewatering of coal gasification fine slag: pore structure regulation, water occurrence evolution, and factor effect analysis

更新时间：2026-06-26

- Mechanical grinding modification for enhanced dewatering of coal gasification fine slag: pore structure regulation, water occurrence evolution, and factor effect analysis
- CIESC Journal (2026)
- 作者机构：
  
  1.中国矿业大学炼焦煤资源绿色开发全国重点实验室，江苏徐州221116
  2.中国矿业大学化工学院，江苏徐州221116
  3.陕西长青能源化工有限公司，陕西榆林721405
  4.安徽理工大学安徽省现代煤炭加工技术研究院，安徽合肥232001
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260443
  CLC： TQ 536
- Received：31 March 2026，
  
  Revised：2026-06-25，
  
  Accepted：26 June 2026，
- 稿件说明：
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XIAO Zongmu, CHEN Liqing, ZHANG Mingcheng, et al. Mechanical grinding modification for enhanced dewatering of coal gasification fine slag: pore structure regulation, water occurrence evolution, and factor effect analysis[J/OL]. CIESC Journal, 2026.
DOI：

XIAO Zongmu, CHEN Liqing, ZHANG Mingcheng, et al. Mechanical grinding modification for enhanced dewatering of coal gasification fine slag: pore structure regulation, water occurrence evolution, and factor effect analysis[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260443.

摘要

针对气化细渣真空过滤效率低、滤饼含水率高的问题，以原渣滤饼含水率为53.14%的气流床水煤浆气化工艺气化细渣为研究对象，采用L

)正交设计，探究研磨条件对脱水性能的影响，并结合粒度分布分析（PSD）、N

吸附/脱附、压汞法（MIP）、低场核磁共振（LF-NMR）和差示扫描量热法（DSC）等手段，分析颗粒特性、孔结构、水分赋存状态及脱水行为的变化规律。结果表明：极差分析显示，三因素对滤饼含水率的主效应趋势为研磨时间

浆料浓度

研磨频率；方差分析表明，三因素整体效应在 95% 置信水平下均未达到显著水平，但研磨时间呈接近显著趋势，且5 min与15 min、5 min与20 min 之间存在显著差异。相对于原渣CQ，在 30% 浆料浓度、15 min研磨条件下，CQ7的滤饼含水率由53.14% 降至42.90%，相对降低19.27%，液上25 s累计滤液量由127.10 mL 增至153.00 mL，提高 20.4%。适度机械研磨能够促进颗粒破碎与粒级重构，使

5500 nm孔隙体积明显下降，并减弱微细孔吸附和毛细束缚作用，从而改善水分迁移与排出条件，提升脱水性能。相比之下，在40% 浆料浓度、5 min研磨

时间和50 Hz研磨频率条件下，CQ13的滤饼含水率仍为50.30%，说明高固含量、短时间研磨条件下脱水强化效果有限。综上，机械研磨强化气化细渣脱水的关键在于优化颗粒级配、调控孔径分布和水分赋存状态，实现储水空间减少与排水通道改善的协同优化。本研究为气化细渣高效脱水提供了理论依据及技术指导。

Abstract

To address the low vacuum filtration efficiency and high filter cake moisture content of coal gasification fine slag

this study investigated an entrained-flow coal-water slurry gasification fine slag with an initial filter cake moisture content of 53.14%. An L

(4³) orthogonal design was used to examine the effects of grinding conditions on dewatering performance. Particle size distribution (PSD)

N₂ adsorption/desorption

mercury intrusion porosimetry (MIP)

low-field nuclear magnetic resonance (LF-NMR)

and differential scanning calorimetry (DSC) were combined to analyze the variations in particle characteristics

pore structure

water occurrence state

and dewatering behavior. The results show that range analysis indicated the main-effect trend of the three factors on filter cake moisture content followed the order of grinding time

slurry concentration

grinding frequency. Analysis of variance showed that the overall effects of the three factors did not reach statistical significance at the 95% confidence level. However

grinding time showed a near-significant trend

and significant differences were observed between 5 min and 15 min

as well as between 5 min and 20 min. Compared with the raw slag CQ

under the conditions of 30% slurry concentration and 15 min grinding

the filter cake moisture content of CQ7 decreased from 53.14% to 42.90%

corresponding to a relative reduction of 19.27%. The cumulative filtrate volume during the 25 s above-slurry filtration stage increased from 127.10 mL to 153.00 mL

representing an increase of 20.4%. Moderate mechanical grinding promoted particle breakage and particle size redistribution

significantly reduced the pore volume larger than 5500 nm

and weakened water adsorption in fine pores and capillary retention

thereby improving wate

r migration and discharge and enhancing dewatering performance. In contrast

under the conditions of 40% slurry concentration

5 min grinding time

and 50 Hz grinding frequency

the filter cake moisture content of CQ13 remained as high as 50.30%

indicating that the dewatering enhancement was limited under high-solid-concentration and short-duration grinding conditions. Overall

the key to enhancing the dewatering of coal gasification fine slag by mechanical grinding lies in the coordinated optimization of particle size distribution

pore size distribution

and water occurrence state

thereby reducing water storage space and improving drainage pathways. This study provides a theoretical basis and technical guidance for the efficient dewatering of coal gasification fine slag.

关键词

Keywords

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