SURFACE-PROPERTIES OF COAL PARTICLES IN AQUEOUS-MEDIA .1. SOLIDIFICATION FRONT MEASUREMENTS

被引：7

作者：

NEUMANN, AW ^{[1
]}

VARGHABUTLER, EI ^{[1
]}

HAMZA, HA ^{[1
]}

ABSOLOM, DR ^{[1
]}

机构：

[1] CANMET, ENERGY MINES & RESOURCES, COAL RES LAB, DEVON TOC 1E0, ALBERTA, CANADA

来源：

COLLOIDS AND SURFACES | 1986年 / 17卷 / 02期

关键词：

This work was supported by Energy; Mines and Resources; CANMET; Canada; through Contracts No. 08082-00023 and No. OST83-00132;

D O I：

10.1016/0166-6622(86)80241-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The particle/vapour interfacial tension of three types of powdered coal was determined by means of the solidification front techniques in organic as well as in aqueous medial. The results obtained from experiments performed in organic media show that the three types of coal have an intermediate hydrophobicity in the surface tension range of 30-40 mJ m-2 at 20.degree. C. However, in the presence of water the coal is markedly more hydrophilic with a surface tension near that of water. This striking difference suggest that one and the same coal sample may have two effective surface tensions or even a range of surface tensions, depending on the suspending liquid. It appears that, in water, the coal particles acquire a thick hydration layer so that they are perceived by other phases present as "black water particles.

引用

页码：131 / 142

页数：12

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