Preparing coal slurry from coking wastewater to achieve resource utilization: Slurrying mechanism of coking wastewater-coal slurry
Preparing coal slurry from coking wastewater to achieve resource utilization: Slurrying mechanism of coking wastewater-coal slurry
复制标题
焦化废水制备煤浆实现资源化：焦化废水-煤浆成浆机理
DOI：
10.1016/j.scitotenv.2018.09.329
复制
发表时间：
2019
影响因子：
9.8
通讯作者：
Zhao Zhenghui
中科院分区：
文献类型：
--
作者：
Wang Ruikun;Ma Qianqian;Ye Xuemin;Li Chunxi;Zhao Zhenghui
利用焦化废水制备水煤浆，可作为燃烧和气化燃料。这种有前途的技术同时实现了资源利用和废水管理。煤浆的成浆性能对煤浆的工业应用至关重要。这些性质受煤表面性质和煤对添加剂的吸附影响很大。在这项研究中，内部组件（例如，测定了煤对焦化废水中有机物（苯酚、氨氮、金属离子）的吸附量及煤表面性质对添加剂吸附的影响。结果表明，苯酚与添加剂之间的竞争吸附降低了添加剂在煤上的吸附量。而苯酚作为添加剂，可以改善煤颗粒的润湿性。阳离子（Ca ~（2+）、NH ~（4+）和Na ~+）削弱了煤的负电荷，对煤浆化有不利影响。此外，由于离子键合效应，大量的水被吸附，从而减少了煤浆体系中的自由水。水煤浆的最大成浆浓度比水煤浆高0.8个百分点，说明焦化废水通过综合不同内部组分的影响，提高了煤浆的成浆能力。
Coking wastewater is used to prepare coal slurry, which can be used as combustion and gasification fuel. This promising technology simultaneously achieves resource utilization and wastewater management. Slurrying properties are essential to the industrial application of coal slurry. These properties are considerably influenced by coal surface properties and the adsorption of an additive by coal. In this study, the effects of the internal components (e.g., phenol, ammonia nitrogen, and metal ions) of coking wastewater on the adsorption of an additive by coal and on coal surface properties were measured. Results showed that the competitive adsorption between phenol and the additive reduced the amount of additive adsorbed on coal. However, phenol acted as an additive to improve the wettability of coal particles. Cations (Ca2+, NH4+, and Na+) adversely affected the slurrying because they weakened the negative charges of coal. Furthermore, a large amount of water was adsorbed due to the ionic bonding effects, thereby reducing the free water in the coal slurry system. The maximum slurrying concentration of CWCS was 0.8 percentage points higher than that of CWS, suggesting that coking wastewater enhanced the slurrying capability of the coal slurry by integrating the various effects induced by the different internal components.