ABSTRACT

The present paper outlines the work done on beneficiation of low-rank-oxidized coal fines by flotation using a biodegradable oil (iluppai or Mahua) to reduce the ash content. Prior to flotation, characterization of the coal and the reagents were done by FTIR and SEM-EDS analysis to identify the functional groups. Batch tests were performed with biodegradable and conventional oil (Diesel) as collectors to compare the flotation performances with an Index known as ‘Separation Index’. The results of the tests conducted revealed that biodegradable Iluppai oil to be the better collector than conventional diesel oil. In the study, the effect of variables like reagent dosages and feed solid concentration was investigated for both the type of collectors. Further, the paper concludes that it is possible to reduce ash% of the low-rank-oxidized coal from a feed ash of 29.9% down up-to 16.60% using Iluppai oil with simultaneous enrichment in Gross Calorific value of coal from 5547.0 to 6861 kCal/kg. From the results obtained, an assessment of the kinetic behavior of the process is made based on the enrichment achieved in the Gross calorific value. The first-order rate equation parameters (Rx) and (k) evaluated for the GCV recovery established that the biodegradable oil as the promising collector.

摘要

本文概述了使用可生物降解的油（iluppai 或 Mahua）浮选低阶氧化煤粉以降低灰分含量的工作。在浮选之前，通过 FTIR 和 SEM-EDS 分析对煤和试剂进行表征，以确定官能团。使用可生物降解的常规油（柴油）作为捕收剂进行批量测试，以将浮选性能与称为“分离指数”的指数进行比较。进行的测试结果表明，可生物降解的 Iluppai 油是比传统柴油更好的捕收剂。在这项研究中，研究了试剂剂量和进料固体浓度等变量对两种捕收剂类型的影响。更远，该论文的结论是，使用 Iluppai 油可以将低阶氧化煤的灰分从 29.9% 的进料灰分降低到 16.60%，同时将煤的总热值从 5547.0 提高到 6861 kCal/公斤。根据所获得的结果，基于在总热值中实现的富集对过程的动力学行为进行评估。一阶速率方程参数 (Rx ) 和 ( k ) 对 GCV 回收率的评估表明，可生物降解油是有前途的捕收剂。