摘要
为改善不黏煤成浆浓度低,浆体性能差的现状。以神华不黏煤(SNC)为研究对象,选用5种不同亲油基强度的聚苯乙烯磺酸钠(PSS)分散剂。通过考察PSS亲油基强度与SNC水煤浆的流变特性、稳定性能、润湿性能及吸附行为之间的构效关系,探究分散剂亲油基团对SNC的成浆作用机理。结果表明:PSS分散剂亲油基团强度显著影响不黏煤制浆的稳定性、流变性和表观黏度。亲油链段加长,分子之间相互交联作用加剧,形成的空间位阻变大,使得浆体稳定性提高。但因分散剂分子在煤表面吸附量及其吸附常数随PSS聚合度的增加先增大后减小,水煤浆的表观黏度和流变性会在PSS聚合度为187时出现极大值。PSS分散剂在煤颗粒表面吸附符合Langmuir单分子层吸附模型,分散剂在浆体中分子间的交联概率低,可均匀吸附在SNC颗粒表面,进而在煤颗粒表面形成均匀的水分子吸附位点,促进形成质地均匀的水化膜。分散剂添加量为干煤粉的0.6%,浆体浓度达61%以上时所制备的SNC水煤浆具有更好的成浆性能。
To improve the status quo of low slurry formation concentration and poor slurry performance of non-stick coal,Herein,Shenhua non-stick coal(SNC)was used as the object of study,and five kinds of sodium polystyrene sulfonate(PSS)dispersants with different lipophilic strengths were selected.The mechanism of the effect of the dispersant lipophilic groups on the slurry formation of SNC was investigated by examining the constitutive relationships between the strength of PSS lipophilic groups and the rheological properties,stability performance,wetting performance and adsorption behavior of SNC coal-water slurry.The results show that the strength of the lipophilic groups of PSS dispersants significantly affects the stability,rheology and apparent viscosity of the non-stick coal slurry.The longer lipophilic chain segments,the increases cross-linking between molecules and the larger spatial potential resistance formed make the slurry more stable.However,the apparent viscosity and rheology of coal-water slurry will be extremely high when the polymerization degree of PSS is 187 because the adsorption amount of dispersant molecules on the coal surface and its adsorption constant KL value increase and then decrease with the increase of PSS polymerization degree.SNC particle surface,which in turn forms uniform water molecule adsorption sites on the coal particle surface and promotes the formation of a uniformly textured hydration film.The SNC coal water slurry prepares with the dispersant content of 0.6%of dry coal powder and the slurry concentration of more than 61%has better slurry performance.
作者
叶泽甫
孟献梁
吴国光
YE Zefu;MENG Xianliang;WU Guoguang(Shanxi Gemeng US-China Clean Energy R&D Center Co.,Ltd.,Taiyuan 030031,China;School of Chemical Engineering&Technology,China University of Mining&Technology,Xuzhou 221116,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第6期180-188,共9页
Clean Coal Technology
基金
国家重点研发计划资助项目(2019YFE0100100)
山西省科技重大专项资助项目(201811002017)。
关键词
PSS分散剂
亲油基团
吸附行为
水煤浆
成浆性能
PSS dispersant
lipophilic group
adsorption behavior
coal water slurry
slurry properties
