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- Title
Effect of the degree of polymerization of nonylphenol polyoxyethylene ether on the dewatering of low-rank coal.
- Authors
Lin Li; Meng He; Mingpu Liu; Mengyu Lin; Shanpei Hu; Hao Yu; Qingbiao Wang; Xiaofang You
- Abstract
In this study, we investigated the effect of the hydrophilic ethylene oxide chain lengths (i.e., degree of polymerization) of nonylphenol polyoxyethylene ether (NPEO-x, x = 8, 10, and 12) on the dewatering of low-rank coal slime through dewatering and adsorption experiments and X-ray photoelectron spectroscopy (XPS) measurements. The dewatering experiments showed that the adsorption of NPEO changed the water content of the low-rank coal slime: NPEO-8 achieved the best effect, followed, in decreasing order, by NPEO-10 and NPEO-12. Adsorption experiments revealed that the adsorption isotherms of NPEO-x on the low-rank coal surface conform with the Langmuir model, and its adsorption kinetics follow the pseudo-second-order kinetic equation. Furthermore, the adsorption is a spontaneous process and controlled by both intraparticle diffusion and liquid film diffusion. The XPS results showed that the adsorption of NPEO-x decreased the content of oxygencontaining groups and, thus, improved the hydrophobicity of the low-rank coal surface. Further, the use of NPEO-x with a low degree of polymerization (x = 8) improves the hydrophobicity of the coal surface and decreases the water content of low-rank coal slime.
- Subjects
ADSORPTION kinetics; DEGREE of polymerization; DIFFUSION; COAL; X-ray photoelectron spectroscopy; ETHYLENE oxide; COALBED methane
- Publication
Physicochemical Problems of Mineral Processing, 2020, Vol 56, Issue 4, p723
- ISSN
1643-1049
- Publication type
Article
- DOI
10.37190/ppmp/124767