Abstract Dry mineral separation methods are based on the pseudo-fluid properties of two-phase gas-solid fluidization during the air dense medium fluidized bed separation. In this paper, the air dense medium fluidized bed separation method was introduced for coal deashing. In order to better understand the impact of separation performance of air dense medium fluidized bed, the uniform stability of fluidized bed on separation performance the factors (fluidization number (N), height-to-diameter ratio (λ) and feeding volume fraction (γ)) were varied. The process optimization of these three factors was investigated. The results showed that the fluidization number was the main factor reflect on fluidized characteristics. The separation efficiency achieved the optimal value when the feeding volume fraction reached 13%. The segregation stabilized at 0.90–0.95, with the possible deviation ranged from 0.10 to 0.15. Further, the yield of cleaned coal is 78.5–80%, and ash content reduced by 75–78%. The dense medium fluidized bed can achieve efficient deashing of coal. Highlights Factors to influence the uniform stability of fluidization within ADMFB. The Process optimization for separation performance was conducted. Synthesizing the separation test results get formulas about feeding volume fraction y and feed rate q. The yield of the cleaned coal is around 80% while its ash decreased to 10%. Graphical Abstract

中文翻译：

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基于空气重介质流化床的分离性能和流化稳定性工艺优化

摘要 干法选矿方法是利用空气重介质流化床分离过程中气固两相流化的假流体特性。本文介绍了空气重介质流化床分离法用于煤的脱灰。为了更好地了解空气重介质流化床分离性能的影响，流化床均匀稳定性对分离性能的影响因素（流化数（N）、高径比（λ）和进料体积分数（γ） )) 是多种多样的。研究了这三个因素的工艺优化。结果表明，流化数是反映流化特性的主要因素。当进料体积分数达到13%时，分离效率达到最佳值。偏析稳定在0。90–0.95，可能的偏差范围为 0.10 到 0.15。此外，精煤收率为78.5-80%，灰分降低75-78%。重介质流化床可实现煤的高效脱灰。重点影响 ADMFB 内流化均匀稳定性的因素。进行了分离性能的工艺优化。综合分离试验结果，得到进料体积分数y和进料速度q的公式。精煤的产率约为80%，而其灰分降至10%。图形概要 重点影响 ADMFB 内流化均匀稳定性的因素。进行了分离性能的工艺优化。综合分离试验结果，得到进料体积分数y和进料速度q的公式。精煤的产率约为80%，而其灰分降至10%。图形概要 重点影响 ADMFB 内流化均匀稳定性的因素。进行了分离性能的工艺优化。综合分离试验结果，得到进料体积分数y和进料速度q的公式。精煤的产率约为80%，而其灰分降至10%。图形概要