EFFECT OF CHEMICAL ADDITIVES ON FLOW CHARACTERISTICS OF COAL SLURRIES

被引：0
|
作者：
Mosa, Eisa S. [1 ]
Saleh, Abdel-Hady M. [1 ]
Taha, Taha A. [1 ]
El-Molla, Anas M. [2 ]
机构：
[1] Al Azhar Univ, Fac Engn, Min & Petr Eng Dept, Cairo, Egypt
[2] Al Azhar Univ, Fac Engn, Civil Eng Dept, Cairo, Egypt
来源：
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING | 2008年 / 42卷
关键词：
coal slurry; viscosity; dispersants; carboxymethylcellulose; gum guar; sulphonic acid; tripolyphoshate;
D O I：
暂无
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：
In the present paper, the effect of chemical additives or reagents on rheological characteristics of coal-water slurry (CWS) was investigated. The power-law model was applied to determine the non-Newtonian properties of coal slurries. Three types of dispersants namely, sulphonic acid, sodium tripolyphosphate and sodium carbonate were studied and tested at different concentrations ranging from 0.5 to 1.5% by weight from total solids. Sodium salt of carboxymethyl cellulose (Na-CMC) and xanthan gum were tested as stabilizers at concentrations in the range of 0.05 to 0.25% by weight from total solids. It was found that apparent viscosity and flow properties of CWS are sensitive to the use of chemical additives (dispersants and stabilizers). Among studied dispersing agents, sulphonic acid recorded the best performance in modification and reducing CWS viscosity. The best dosage of all tested dispersants was found to be as 0.75% by wt of solids. With regard to studied stabilizers, Na-CMC recorded better performance than xanthan gum. The best dosage of investigated stabilizers was found to be as 0.1% by wt. from total solids.
引用
收藏
页码：107 / 118
页数：12
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