Valuable non-ferrous (NFe) metals are contained in municipal solid waste incineration (MSWI) bottom ash (BA). The applicability of an air table for separating NFe metal-abundant particles in MSWI BA (<8 mm) was studied. A stepwise separation procedure was developed based on the performance tests of the air table conducted by changing three variables (air injection, vibration, and end slope). As a result of the stepwise separation, six bulk density ranges (<0.7 to >1.1 g/cm³ at intervals of 0.1 g/cm³) were prepared from non-magnetic fractions with four size ranges (4–8, 2–4, 1–2, and 0.5–1 mm). The effectiveness of air table sorting was evaluated based on dry particle density and proportion of metals. NFe metals were obtained by sieving (>0.5 mm) after a ball mill process, confirming that NFe metals accounted for 3.2% of the < 8 mm MSWI BA. The highest particle density of each size fraction and the proportion of NFe metals in the fractions were 3.19 g/cm³ and 59.9% (4–8 mm), 2.97 g/cm³ and 28.8% (2–4 mm), 2.78 g/cm³ and 10.4% (1–2 mm), and 2.87 g/cm³ and 4.4% (0.5–1 mm). In the 0.5–2 mm particles, the highest density fraction contained 68.7% of the NFe metals, which were expected to be recovered by applying an air table separator to MSWI BA 0.5–2 mm.

市政固体废物焚烧（MSWI）底灰（BA）中包含有价值的有色金属（NFe）。研究了用于分离MSWI BA（<8 mm）中NFe富金属颗粒的空气床的适用性。根据空气表的性能测试，通过更改三个变量（空气注入，振动和端坡）进行了逐步分离程序。逐步分离的结果是六个堆积密度范围（<0.7至> 1.1 g / cm ³，间隔为0.1 g / cm ³）由具有四个尺寸范围（4-8、2-4、1-2和0.5-1 mm）的非磁性部分制成。空气表分选的有效性是根据干颗粒密度和金属比例进行评估的。通过球磨工艺过筛（> 0.5 mm）获得NFe金属，证实NFe金属占<8 mm MSWI BA的3.2％。每个尺寸馏分的最高颗粒密度和NFe金属在这些馏分中的比例分别为3.19 g / cm ³和59.9％（4-8 mm），2.97 g / cm ³和28.8％（2-4 mm），2.78 g / cm ³和10.4％（1-2 mm），以及2.87 g / cm ³和4.4％（0.5-1 mm）。在0.5–2 mm的颗粒中，最高密度部分包含68.7％的NFe金属，预计可通过在MSWI BA 0.5–2 mm上安装空气分离器来回收。