Synthesis and Evaluation of Sulfonated Humic Acid-Acrylic Acid Graft Copolymer Applied as Dispersant in Coal-Water Slurry

2012 ◽  
Vol 581-582 ◽  
pp. 334-337
Author(s):  
Jun Guo Li ◽  
Guang Hua Zhang ◽  
Long Liu ◽  
Fang Zhao
Keyword(s):  
Humic Acid ◽  
Acrylic Acid ◽  
Graft Copolymer ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
New Type ◽  
Rate Behavior ◽  
Formulation Stability ◽  
Low Dosage ◽  
Highly Loaded

A new type of graft copolymer, sulfonated humic acid-acrylic acid resin (SHA), was synthesized and developed as dispersant for highly-loaded coal water slurry (CWS) from Chinese Binchang coal. In this study, The formulation, stability and rheology of the slurry with SHA were investigated. The experimental results show that SHA can reduce effectively CWS viscosity at low dosage, and that the CWS with SHA has excellent stability within 48 h and exhibits shear-thinning apparent viscosity/shear rate behavior. Based on the above, SHA is a promising dispersant for highly-loaded CWS in the practical use in industry.

Synthesis of Coal-Water Slurry Dispersant Based on Humic Acid

2011 ◽  
Vol 347-353 ◽  
pp. 1466-1469 ◽  
Author(s):  
Guang Hua Zhang ◽  
Hao Hao ◽  
Jun Feng Zhu
Keyword(s):  
Reaction Time ◽  
Humic Acid ◽  
Acrylic Acid ◽  
Active Ingredient ◽  
Orthogonal Experiment ◽  
Reaction System ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Water Slurry ◽  
Coal Water Slurry

This paper focused on the preparation of the grafted modification of humic acid (HA) that was used in coal water slurry (CWS). By means of orthogonal experiment, the grafted humic acid was synthesized with acrylic acid (AA) copolymerized with humic acid, using potassium persulfate as the initiator in the reaction system. The structure of copolymer was characterized by ATR-FTIR. And then, the viscosity, liquidity, and stability of CWS used the dispersant based on the modified humic acid were determined through the CWS viscometer and tests of stability. The optimum conditions of synthesis are that the mass ratio of AA and HA is 0.35:1, dosage of initiator is 5%, reaction temperature of is 75°C, reaction time is 2.0h. Besides, when the dosage of active ingredient of the dispersant for CWS was 0.12%, the viscosity of CWS achieved lower.

scholarly journals Characteristics of Wet Grinding of Highly Loaded Coal Water Slurry [Translated]†

1989 ◽  
Vol 7 (0) ◽  
pp. 43-49
Author(s):  
Hayami Itoh ◽  
Shuhei Tatsumi ◽  
Yoshihiro Kajibata ◽  
Shoichi Takao ◽  
Hironori Ozaki ◽  
...  
Keyword(s):  
Wet Grinding ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Highly Loaded

Synthesis of Starch Graft Copolymer Dispersant and its Application Performance in Coal-Water Slurry

2012 ◽  
Vol 581-582 ◽  
pp. 330-333
Author(s):  
Guang Hua Zhang ◽  
Fang Zhao ◽  
Jun Guo Li
Keyword(s):  
Shear Rate ◽  
Graft Copolymer ◽  
Fluid Model ◽  
Application Performance ◽  
Styrene Sulfonate ◽  
Water Slurry ◽  
Oxidation Reduction ◽  
Coal Water Slurry ◽  
Plastic Fluid ◽  
Initiator System

In this study, a new starch graft copolymer dispersant for Chinese Shenhua coal-water slurry (CWS) was prepared by radical polymerization using styrene sulfonate (SSS), hydroxyethyl acrylate (HEA) and methyl acrylic acid (MAA) as graft monomers in oxidation-reduction initiator system. The apparent viscosity, static stabilization and rheology of Shenhua coal-water slurry prepared with the dispersant have been were investigated. The experimental results demonstrate that the CWS gives the minimal viscosity of 826 mPas at coal concentration of 66 wt%, dispersant dosage of 0.5 wt% and shear rate of 100 s-1. Bleeding ratio tests indicate the starch graft copolymer can stabilize the slurry. The rheological behavior of the prepared CWS can be described by the pseudo-plastic fluid model. On the basis of the above, the starch graft copolymer dispersant has broad prospect for the application for CWS.

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