摘要
采制城市污泥样品和煤样,采用傅里叶变换红外光谱和扫描电子显微镜表征污泥样品的组成特征和微观形貌,测定污泥颗粒和煤颗粒对聚羧酸型分散剂SAF的吸附等温线、研究吸附动力学。此外,制备了污泥水煤浆并考察污泥掺加量与分散剂用量对水煤浆浓度的影响。结果表明,污泥中存在极强的分子间氢键缔合羟基,并含有大量由丝状微生物等形成的絮凝体结构;污泥颗粒对分散剂的饱和吸附量为7.98 mg/g,大于煤颗粒对分散剂的饱和吸附量4.91 mg/g;污泥颗粒对分散剂的吸附基本符合一级动力学方程,而煤颗粒对分散剂的吸附符合二级动力学方程,且分散剂在污泥颗粒形成的空隙中的扩散是决定吸附过程的主要因素;随污泥掺加量的增大,污泥水煤浆的定黏浓度降低、成浆性变差。污泥的组成、结构特征造成了成浆体系中污泥和煤对分散剂的竞争吸附,是影响污泥水煤浆成浆特性的重要因素,可以通过增加分散剂的用量来改善污泥水煤浆的成浆性。
The municipal sludge （sludge） and coal samples were collected and prepared in this study. The constituent characteristics and microstructures of sludge were tested by Fourier transform infrared spectroscopy and scanning elec- tron microscope. The isothermal adsorption of the dispersant （sulfonated acetone-formaldehyde dispersant （SAF）） on- to sludge and coal surface were studied, respectively. Furthermore, the adsorption kinetics were also researched. Addi- tionally,the coal sludge slurries （CSSs） were prepared to study the influences of sludge additive amount and disper- sant quantity. The results showed that there were strongly polar hydroxyl functional groups in sludge, associating by in- termolecular hydrogen bonds. A plenty of flocs composed by filamentous microorganism were discovered in sludge. The extent of saturated adsorption of SAF by sludge particles was 7.98 mg/g,greater than the value of 4.91 mg/g for thesaturated adsorption of SAF by coal particles. The adsorption kinetics of sludge adsorbing SAF closely fitted the first- order kinetics model. However, the pattern of eoal adsorbing SAF trended toward the second-order kinetics model. The researeh also indicated that the determinant factor of sludge adsorbing SAF was the diffusion of SAF in a porous struc- ture built by sludge particles. With the increases of sludge additive amount,the fixed-viscosity concentrations and the slurp/abilities of CSSs decreased. The constituents and microstruetures of sludge were the main reasons for the eompeti- tion between sludge and coal to adsorb SAg, and it also deeply influenced the slurryability of CSSs which eould be improved by adding dispersant amount.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2017年第6期1565-1571,共7页
Journal of China Coal Society
基金
国家自然科学基金资助项目(51204179
51204182)
中央高校基本科研业务费专项资金资助项目(2014XT05)
关键词
城市污泥
水煤浆
分散剂
吸附作用
municipal sludge
coal water slury
dispersant
adsorption
