ABSTRACT

High-efficiency deashing and desulfurization of fine coal is an inevitable trend in the comprehensive utilization of coal resources. This work introducing heavy-medium into the enhanced gravity field to examine the effect of each parameter on the performance of fine coal separation. On this basis, the Response Surface Methodology (RSM) was conducted to study the influential significance of parameters, parametric interactions, and performance optimization of fine coal separation in the heavy-medium enhanced gravity field. The feed dosage and heavy-medium density influence the separation indexes obviously by changing the sorting environment, while the rotational frequency and recoil water pressure affect the separation effect apparently by adjusting the force on particles. The performance optimization results showed that the desired separation indexes – η_t of 81.11%, η_a of 80.00%, β of 44.93%, and λ of 44.76% can be obtained under the optimal combination of parameter levels – M of 27.23 g, ρ of 1.4 g/cm³, f of 30 Hz, and P of 0.03 Mpa. The verification experiments were carried out and the results were consistent with the results of performance optimization. The introduction of heavy-medium provides a new efficient way for the deashing and desulfurization of fine-grained high-sulfur coal in the enhanced gravity field.

摘要

粉煤高效脱灰脱硫是煤炭资源综合利用的必然趋势。这项工作将重介质引入增强重力场，以检验每个参数对煤粉分离性能的影响。在此基础上，采用响应面法（RSM）研究了重介质强化重力场中煤粉分离参数、参数相互作用和性能优化的影响意义。进料量和重介密度通过改变分选环境对分离指标有明显影响，而转速和反冲水压通过调节对颗粒的作用力对分离效果有明显影响。在最佳参数水平组合下可得到η _t 81.11%，η _a 80.00%，β 44.93%，λ 44.76%—— M 27.23 g，ρ 1.4 g/cm ³，f 30 Hz , P为 0.03 Mpa。进行了验证实验，结果与性能优化结果一致。重介的引入为细粒高硫煤在强化重力场中的脱灰脱硫提供了一条新的有效途径。