Performance and mechanism of polyacrylamide stabilizers in coal water slurry

Zhang，Yan1; Hu，Shunxuan1; Yang，Xin2; Jiang，Fenghao1; Wu，Changning3,4; Li，Junguo3,4; Liu，Ke1,3,4

2021-12-05

10.1016/j.colsurfa.2021.127544

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   影响因子和分区

0927-7757

1873-4359

The stability of coal water slurry (CWS) is a significant factor affecting its storage and transportation. However, the understanding of the mechanism of high-molecular-weight polymer used as stabilizers in CWS is still limited. We experimentally studied the rheological behaviors and stability performance of coal water slurry prepared with anionic (APAM), cationic (CPAM) and nonionic (NPAM) polyacrylamide. Apparent viscosity and rheology were measured using a viscometer. The rod penetration method incorporating with the oscillation method was applied to evaluate the stability performance of CWS. The zeta potential measurement and interaction energy calculations were also conducted. The results showed that the apparent viscosity of CWS increased with the addition of all the three PAMs. CWS by adding either APAM or CPAM behaved as a pseudoplastic fluid while the CWS with the addition of NPAM behaved as a dilatant fluid. The CWS with 0.1 wt% (on the dry coal basis) APAM exhibited the best stability performance. The settling rate for this slurry was the lowest (6.67%), and the zeta potential was the highest (−22.33 mV). The CWS by adding APAM had the highest total interaction energy between coal particles among four samples. The mechanism that controls the stability of CWS may be relevant to the increased electrostatic repulsive energy between coal particles by adding APAM, which depends on the surface potential of coal particles.

coal water slurry polyacrylamide rheological behaviors stability surface potential

SCI ; EI

英语

第一 ; 通讯

WOS:000707049700003

20214010970373

Coal ; Coal storage ; Stability ; Surface potential ; Viscosity ; Zeta potential

Solid Fuels:524 ; Fluid Flow, General:631.1 ; Storage:694.4 ; Electricity: Basic Concepts and Phenomena:701.1 ; Colloid Chemistry:801.3 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2

CHEMISTRY

2-s2.0-85115981448

Scopus

1.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Engineering Science,University of Oxford,Oxford,OX2 0ES,United Kingdom
3.Shenzhen Engineering Research Center for Coal Comprehensive Utilization (SCCCU),School of Innovation and Entrepreneurship,Southern University of Science and Technology,Shenzhen,518055,China
4.Clean Energy Institute,Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Yan,Hu，Shunxuan,Yang，Xin,et al. Performance and mechanism of polyacrylamide stabilizers in coal water slurry[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2021,630.

Zhang，Yan.,Hu，Shunxuan.,Yang，Xin.,Jiang，Fenghao.,Wu，Changning.,...&Liu，Ke.(2021).Performance and mechanism of polyacrylamide stabilizers in coal water slurry.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,630.

Zhang，Yan,et al."Performance and mechanism of polyacrylamide stabilizers in coal water slurry".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 630(2021).