Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 34132, South Korea.
Thermo-Fluid & Process Research Group, POSCO Technical Research Laboratories, Gyeongbuk 37859, South Korea.
Waste Manag. 2020 Jun 15;111:51-57. doi: 10.1016/j.wasman.2020.05.020. Epub 2020 May 26.
This research focused on the recovery of valuable materials from ferrous grinding swarf. We received the sample from the automobile industry. The sample has consisted of approximately 20 wt% moisture and 80 wt% residue (oil and soild). The chemical composition of the oven-dried sample was approximately 87 wt% iron. In this study, aqueous washing process for oil removal from ferrous grinding swarf was investigated with two different commercial reagents, Micro-90 and Detergent 8. Three different amounts of solids (2, 3, and 4 g) were mixed with 20 mL of diluted reagents for the aqueous washing. In the Micro-90 solution, about 80% of the oil was removed after three washing cycles at a solids content less than 3 g/20 mL. On the other hand, when using Detergent 8, 100% oil was removed after three washing cycles at a solids content of less than 3 g/20 mL. Pulp density was an important factor in determining oil removal efficiency. For the scale-up experiment, different washing methods such as ultrasonication and overhead stirrer were examined. The preliminary reuse test of the Detergent 8 solution was also conducted for the feasibility of the aqueous washing process.
本研究专注于从铁屑磨屑中回收有价值的材料。我们从汽车行业收到了样品。该样品由大约 20wt%的水分和 80wt%的残渣（油和固体）组成。经烘干后的样品化学成分约为 87wt%的铁。在这项研究中，使用两种不同的商业试剂——Micro-90 和洗涤剂 8，研究了从铁屑磨屑中去除油的水清洗工艺。将三种不同量的固体（2、3 和 4g）与 20mL 稀释试剂混合，进行水清洗。在 Micro-90 溶液中，在固体含量小于 3g/20mL 的情况下，经过三次清洗循环，大约可以去除 80%的油。另一方面，当使用洗涤剂 8 时，在固体含量小于 3g/20mL 的情况下，经过三次清洗循环，可去除 100%的油。纸浆密度是决定除油效率的一个重要因素。对于放大实验，研究了不同的清洗方法，如超声和顶置搅拌器。还对洗涤剂 8 溶液的初步再利用测试进行了考察，以验证水清洗工艺的可行性。
