College of Safety Science and Engineering, Xi'an University of Science and Technology, Innovative Building, 58 Yanta Rd, Xi'an, 710054, Shaanxi, China.
Department of Mining Engineering, Missouri University of Science and Technology, Rolla, USA.
Environ Sci Pollut Res Int. 2021 Jul;28(26):34937-34952. doi: 10.1007/s11356-021-13169-1. Epub 2021 Mar 4.
Red sand dust pollution is of great concern for its occupational and environmental detriments. The current remediation technique includes water spray and non-traditional stabilization via the application of polymer stabilizers. The dust erosion resistance plays a significant role in quantifying the effectiveness of red sand dust suppression. The aim of this paper is to evaluate the reliability and accuracy of five static and dynamic laboratorial methods that are commonly utilized to quantify the dust erosion resistance in the presence of polymers in previous studies, which are wind tunnel simulation, dynamic viscosity test, crust thickness test, penetration resistance test, and unconfined compressive strength test. The advantages and shortcomings of these methods were comprehensively demonstrated. The results illustrated that the penetration resistance test is the most reliable method in terms of the highest accuracy and relatively simpler operation. It also reveals excellent universality for effectively quantifying the dust erosion resistance of red sand with different particle sizes and for different polymers with various concentrations, while the rest of the methods failed to identify. The application of polymers contributes to improved dust erosion resistance for longer crust failure time, higher solution dynamic viscosity and crust penetration resistance, and higher unconfined compressive strength of rending sand samples. PAM outperformed guar gum and xanthan gum on the base of polymer ionicity and molecular weight. This study offers a better understanding in guiding the selection of optimum evaluation methods and polymers for the study of bauxite residue dust control.
红砂粉尘污染因其对职业和环境的危害而引起广泛关注。目前的修复技术包括水喷雾和通过应用聚合物稳定剂进行非传统稳定化。粉尘抗侵蚀性在量化红砂粉尘抑制的有效性方面起着重要作用。本文的目的是评估在聚合物存在下，以前研究中常用的五种静态和动态实验室方法来量化粉尘抗侵蚀性的可靠性和准确性，这些方法是风洞模拟、动态粘度测试、壳层厚度测试、穿透阻力测试和无约束抗压强度测试。这些方法的优缺点得到了全面的展示。结果表明，在准确性最高和操作相对简单的情况下，穿透阻力测试是最可靠的方法。它还对不同粒径的红砂和不同浓度的不同聚合物的粉尘抗侵蚀性进行了有效的量化，而其他方法则无法识别。聚合物的应用有助于提高粉尘抗侵蚀性，延长壳层失效时间，提高溶液动态粘度和壳层穿透阻力，提高红砂的无约束抗压强度。基于聚合物离子性和分子量，PAM 优于瓜尔胶和黄原胶。本研究为指导最优评价方法和聚合物的选择提供了更好的认识，以用于研究铝土矿残渣粉尘控制。
