YAO Yaqian;YANG Zhiyuan;MEMG Zhuoyue;LI Yinyan;ZHU Hanbo;College of Chemistry and Chemical Engineering,Xi′an University of Science and Technology;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization of Land and Resources;

Abstract：

In order to solve the problem of the waste of semi-coke resources in China, the preparation of semi-coke water slurry with semi-coke powder instead of raw coal can not only alleviate the pressure of oil demand, but also provide a new way for the utilization of semi-coke powder. In this paper, the properties, adsorption mechanism and adsorption kinetics of anionic dispersants were studied by using Shenfu semi-coke powder and five different dispersants(methylene dinaphthalene sulfonate NNO, sodium lignosulfonate SLS, sodium humate SH, polycarboxylate PCE, complex anion-anion NNO/PCE). The rheological behavior of semi-coke water slurry prepared with each dispersant was studied. The semi-coke water slurry with different dispersants shows pseudoplastic fluid characteristics. When NNO/PCE dispersant is added, the apparent viscosity of the slurry is only 359.3 mPa·s at the shear rate of 100 s^(-1), and the water separation rate is small without hard precipitation. When NNO is used as dispersant, the fluidity is good, but the stability is poor and the water separation rate is the largest. Through the infrared spectrum test of the semi-coke particle with different dispersants, it is found that the addition of dispersants could change the hydrophilicity and hydrophobicity of the semi-coke particle surface.The adsorption test results show that NNO, SLS, SH, PCE and NNO/PCE reach the adsorption equilibrium at 60,60,120,240 and 240 min, respectively. The increasing trend of adsorption capacity is NNO/PCE(8.796 mg/g)>PCE(7.977 mg/g)>SH(6.845 mg/g)>SLS(3.718 mg/g)>NNO(1.029 mg/g). The pseudo-second-order rate equation can well describe the adsorption kinetics of dispersant on the surface of semi-coke. Finally, the adsorption mechanism model of anionic dispersants was proposed. The results show that the adsorption of anionic dispersants in semi-coke water slurry is mainly due to the enhancement of electrostatic repulsion in semi-coke particles.

Key Words： semi-coke water slurry;dispersant;rheology;stability;adsorption kinetics;adsorption mechanism

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(41772166);; 西安市科技局科技计划资助项目(201805036YD14CG20(6));; 陕西省重点研发计划资助项目(2017ZDCXL-GY-10-01-02);; 国土资源部煤炭资源勘查与综合利用重点实验室重大专项资助项目(SMDZ-2019ZD-2)

Authors: YAO Yaqian;YANG Zhiyuan;MEMG Zhuoyue;LI Yinyan;ZHU Hanbo;College of Chemistry and Chemical Engineering,Xi′an University of Science and Technology;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization of Land and Resources;

DOI: 10.13226/j.issn.1006-6772.21063004

References：

• [1] 王维兴.使用兰炭促进节能减排降低炼铁成本[C]//2012年全国炼铁生产技术会议暨炼铁学术年会文集(上).无锡：[s.n.],2012.
• [2] LI Qing,LI Xinghua,JIANG Jingkun,et al.Semi-coke briquettes:Towards reducing emissions of primary PM2.5,particulate carbon,and carbon monoxide from household coal combustion in China[J].Scientific Reports,2016,6:19306.
• [3] YANG Zhiyuan,MENG Zhuoyue,LI Zhihua,et al.Synthesis and application of itaconic acid water-coke slurry dispersant[J].Materials Science Forum,2017,896:167-174.
• [4] 谢欣馨，戴爱军，杜彦学，等.水煤浆分散剂的发展动向[J].煤炭加工与综合用，2010(2):43-46.XIE Xinxin,DAI Aijun,DU Yanxue,et al.Development trend of coal water slurry dispersant[J].Coal Processing and Comprehensive Utilization,2010(2):43-46.
• [5] 孟茁越，杨志远，鞠晓茜，等.分散剂对水焦浆成浆性影响的量子化学研究[J].燃料化学学报，2019,47(9):1025-1031.MENG Zhuoyue,YANG Zhiyuan,JU Xiaoqian,et al.Study on effect of dispersant on semi-coke water slurry property based on quantum chemistry calculation[J].Journal of Fuel Chemistry Technology,2019,47(9):1025-1031.
• [6] XU Renfu,ZHUANG Wei,HE Qihui,et al.Effects of chemical struc-ture on the properties of carboxylate-type copolymer dispersant for coal-water slurry[J].Aiche Journal,2010,55(9):2461-2467.
• [7] JING Huang,JUN Xu,WANG Dong,et al.Effects of amphiphilic copolymer dispersants on rheology and stability of coal water slurry[J].Industrial & Engineering Chemistry Research,2013,52(25):8427-8435.
• [8] MA Sude,ZHAO Pei,GUO Yan,et al.Synthesis,characterization and application of polycarboxylate additive for coal water slurry[J].Fuel,2013,111:648-652.
• [9] AKTAS Zeki,TEDWOODBURNB E.Effect of addition of surface active agent on the viscosity of a high concentration slurry of a low-rank British coal in water[J].Fuel Processing Technology,2000,62:1-15.
• [10] ZHU Junfeng,GAO Weichun,WANG Pei,et al.Dispersion performances and adsorption behavior of novel block polycarboxylate with hybrid side chains in coal-water slurry[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2020,594(5):124644.
• [11] YANG Dongjie,QIU Xueqing,ZHOU Mingsong,et al.Properties of sodium lignosulfonate as dispersant of coal water slurry[J].Energy Conversion & Management,2007,48(9):2433-2438.
• [12] ATESOK G,DINCER H,OZER M,et al.The effects of dispersa-nts (PSS-NSF) used in coal-water slurries on the grindability of coals of different structures[J].Fuel,2005,84(7/8):801-808.
• [13] QIU Xueqing,ZHOU Mingsong,YANG Dongjie,et al.Evaluation of sulphonated acetone-formaldehyde (SAF) used in coal water slurries prepared from different coals[J].Fuel,2007,86(10/11):1439-1445.
• [14] HU Shunxuan,LIU Liming,YANG Xin,et al.Influence of diffe-rent dispersants on rheological behaviors of coal water slurry prepared from a low quality coal[J].RSC Advances,2019,9:32911-32921.
• [15] WANG Jincao,WEI Liguo,WU Peng,et al.Preparation of semicokes by medium-low temperature pyrolysis of long flame coal and their adsorption performance on sodium lignin sulfonate dispersant for high concentration coal water slurry[J].Journal of Dispersion Science and Technology,2020,42(11):1-13.
• [16] WANG Ruikun,MA Qianqian,ZHAO Zhen,et al.Adsorption of surfactants on coal surfaces in the coking wastewater environment:Kinetics and effects on the slurrying properties of coking wastewater-coal slurry[J].Industrial & Engineering Chemistry Research,2019,58(28):12825-12834.
• [17] TU Yanan,FENG Ping,REN Yangguang,et al.Adsorption of ammonia nitrogen on lignite and its influence on coal water slurry preparation[J].Fuel,2019,238:34-43.
• [18] LIU Pengfei,ZHU Mingming,ZHANG Zhezi,et al.Rheological behaviour and stability characteristics of biochar-water slurry fuels:Effect of biochar particle size and size distribution[J].Fuel Processing Technology,2017,156:27-32.
• [19] PARK Ju-hyoung,LEE Young-joo,JIN Min-ho,et al.Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)[J].Fuel Guildford,2017,203:607-617.
• [20] ZHANG Guanghua,LI Junguo,ZHU Junfeng,et al.Syntheses and evaluations of three sulfonated polycondensate dispersants for coal-water slurries[J].Powder Technology,2014,254:572-578.
• [21] ZHU Junfeng,WANG Pei,LI Yuanbo,et al.Dispersion performance and mechanism of polycarboxylates bearing side chains of moderate length in coal-water slurries[J].Fuel,2017,190:221-228.
• [22] LAGERGREN S.Zur theorie der sogenannten adsorption geloster stoffe[J].Kungliga Svenska Vetenskapsakademiens.Handlingar,1898,24:1-39.
• [23] HO Y S,MCKAY G.Pseudo-second order model for sorption processes[J].Process Biochemistry,1999,34(5):451-465.
• [24] 赵馨.HRP引发淀粉接枝共聚物水煤浆分散剂的合成及其性能研究[D].西安：陕西科技大学，2017.
• [25] WANG Jincao,WEI Liguo,WU Peng,et al.Preparation of semicokes by medium-low temperature pyrolysis of long flame coal and their adsorption performance on sodium lignin sulfonate dispersant for high concentration coal water slurry[J].Journal of Dispersion Science and Technology,2020,42:1610-1622.
• [26] ZHANG Kang,JIN Li,CAO Qing.Evaluation of modified used engine oil acting as a dispersant for concentrated coal-water slurry[J].Fuel,2016,175:202-209.