Wang Hui, Wang Chong-qing, Fu Jian-gang, Gu Guo-hua
School of Chemistry and Chemical Engineering, Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, Central South University, Changsha, 410083 Hunan, China.
School of Chemistry and Chemical Engineering, Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, Central South University, Changsha, 410083 Hunan, China.
Waste Manag. 2014 Feb;34(2):309-15. doi: 10.1016/j.wasman.2013.11.007. Epub 2013 Dec 16.
The surface free energy, surface tension and contact angles were performed to investigate the properties of wetting agents. Adsorption of wetting agents changes wetting behavior of polymer resins. Flotability of polymer materials modulated by wetting agents was studied, and wetting agents change significantly flotability of polymer materials. The flotability decreases with increasing the concentration of wetting agents, and the wetting ability is lignin sulfonate (LS)>tannic acid (TA)>methylcellulose (MC)>triton X-100 (TX-100) (from strong to weak). There is significant difference in the flotability between polymer resins and plastics due to the presence of additives in the plastics. Flotation separation of two-component and multicomponent plastics was conducted based on the flotability modulated by wetting agents. The two-component mixtures can be efficiently separated using proper wetting agent through simple flotation flowsheet. The multicomponent plastic mixtures can be separated efficiently through multi-stage flotation using TA and LS as wetting agents, and the purity of separated component was above 94%, and the recovery was more than 93%.
通过测定表面自由能、表面张力和接触角来研究润湿剂的性能。润湿剂的吸附会改变聚合物树脂的润湿行为。研究了由润湿剂调节的聚合物材料的浮选性，润湿剂会显著改变聚合物材料的浮选性。浮选性随润湿剂浓度的增加而降低，润湿能力为木质素磺酸盐（LS）>单宁酸（TA）>甲基纤维素（MC）>曲拉通X-100（TX-100）（从强到弱）。由于塑料中存在添加剂，聚合物树脂和塑料的浮选性存在显著差异。基于由润湿剂调节的浮选性对双组分和多组分塑料进行浮选分离。使用合适的润湿剂通过简单的浮选流程可以有效地分离双组分混合物。以TA和LS作为润湿剂，通过多级浮选可以有效地分离多组分塑料混合物，分离组分的纯度高于94%，回收率超过93%。
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