一种基于天然固体酸高效分离铝塑复合物的方法研究

A study for high-efficiency separation of aluminum-plastic composites based on natural solid acids

采用天然固体酸作为分离剂,将它们的水溶液用于分离铝塑复合物.通过研究三种固体酸浓度、温度和液固比对铝塑分离的影响,发现在90℃下,液固比为350L/kg,6mol/L的草酸水溶液对铝塑复合物有最佳的分离效果.在此条件下,铝塑完全分离仅需15min,铝损失率不超过4.4%.另外,通过研究草酸的回用性能,证明草酸在其最适条件下回用3次后对铝塑仍具有较好的分离效果.低挥发性且廉价的绿色天然固体酸有望成为实现铝塑复合物低成本、高效率分离回收的新型分离剂.

Natural solid acids were selected to separate aluminum plastic composites. The effects of temperature, concentration and solid liquid ratio of three solid acids on the separa tion efficiency of aluminum and plastic were investigated. The optimum conditions were as fellow：liquid solid ratio was 350 L/kg,the temperature was 90 ℃ ,and the concentration of oxalic acid solution was 6 mol/L. Under this condition, the completely separated time was only 15 min,and the aluminum loss rate did not exceed 4.4%. In addition,it was proved that oxalic acid still maintained good separation effect on aluminum plastic when it was reused 3 times. Low volatility and cheap green natural solid acid is expected to become a new type of separating agent for the realization of low cost and high efficiency separation and recovery of aluminum plastic composites.