Department of Mining Engineering and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Kalgoorlie, WA, Australia.
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, People's Republic of China.
Environ Technol. 2020 Feb;41(5):556-565. doi: 10.1080/09593330.2018.1505963. Epub 2018 Aug 6.
Dust emission from the bauxite residue drying areas is of great concern for its serious environmental and health impacts. The application of polymer stabilizers is a promising approach to mitigate such issues. However, limited studies have been done on their application on red sand and the investigation of the effect of polymers on penetration resistance, which is a key mechanical property closely related to the dust control performance. Stabilizers reduce the dust emission potential by forming a crust on the surface of treated material. This paper investigates the relationship of crust properties and dust control performance by applying synthetic (polyacrylamide) and natural (xanthan gum and guar gum) polymers. Results illustrated that the water retention property of treated sand is greatly improved after the application of stabilizers. The thickness of the formed crust decreases with stabilizer concentration. Results from wind tunnel simulation illustrated that the polymer stabilizer offers nearly 8 times longer protective period than water when used as a stabilizing agent. Cationic PAM performed the best, and cationic guar gum outperformed anionic xanthan gum. The penetration resistance is proved in this study to be a primary index for predicting dust control performance of polymer stabilizers.
铝土矿残渣干燥区域的粉尘排放对环境和健康造成了严重影响，因此引起了极大关注。聚合物稳定剂的应用是减轻此类问题的一种有前途的方法。然而，目前关于聚合物在红砂上的应用及其对抗穿透性的影响的研究还很有限，而抗穿透性是与粉尘控制性能密切相关的关键力学性能。稳定剂通过在处理材料的表面形成外壳来降低粉尘排放的可能性。本文通过应用合成（聚丙烯酰胺）和天然（黄原胶和瓜尔胶）聚合物来研究外壳特性与粉尘控制性能之间的关系。结果表明，稳定剂的应用大大提高了处理砂的保水性能。形成的外壳厚度随稳定剂浓度的降低而降低。风洞模拟结果表明，聚合物稳定剂作为稳定剂使用时，提供的保护时间比水长近 8 倍。阳离子聚丙烯酰胺表现最好，阳离子瓜尔胶优于阴离子黄原胶。本研究证明，抗穿透性是预测聚合物稳定剂粉尘控制性能的主要指标。
