Abstract Due to the serious environmental problem, dry coal separation has become the hot research topic in the world. In the study, an air dense fluidized bed was used for reduction of ash content and mercury rejection with shallow bed heights. The results showed that pressure drop fluctuation was smallest when bed height was 100 mm. When fluidized gas velocity was 1.50 Umf, the ash content decreased to 9.65, 10.33, and 11.74% for −6 + 3, −3 + 2, and −2 + 1 mm samples; the yield of clean coal were 77.45, 81.52, and 83.65% for −6 + 3, −3 + 2, and −2 + 1 mm samples; the mercury content decreased to 0.47, 0.48, and 0.48 ppm for −6 + 3, −3 + 2, and −2 + 1 mm samples. The results indicated that an air gas-solid fluidized bed has satisfied separation performance on fine coal beneficiation with shallow bed height.

中文翻译：

---

浅床高气密流化床粉煤脱灰脱汞

摘要 由于严重的环境问题，干法选煤已成为国际上的研究热点。在研究中，空气密集流化床被用于减少灰分含量和低床高度的汞截留。结果表明，床高为100 mm时压降波动最小。当流化气体速度为1.50 Umf时，-6 + 3、-3 + 2和-2 + 1 mm样品的灰分含量分别下降到9.65、10.33和11.74%；-6+3、-3+2和-2+1mm样品的精煤收率分别为77.45%、81.52%和83.65%；对于 -6 + 3、-3 + 2 和 -2 + 1 毫米样品，汞含量降低至 0.47、0.48 和 0.48 ppm。结果表明，气固流化床对浅床高细煤选矿具有满意的分离性能。