Exploring the performance of an Air Plant

¹ Genet Mineral Processing Company South Africa
² Seriti Company, Emalahleni, Mpumalanga, South Africa

Abstract

The global depletion of high-quality coal reserves necessitates a paradigm shift in coal processing. Traditional methods have focused primarily on wet processes; however, the industry requires alternative methods that are fit for purpose and cost-effective while still yielding the desired outcome. This project explores the alternative method of dry processing of coal with air as a separation medium using Air Plant technology. In this study, bulk samples of different coal sources and blends were utilized, and various tests were conducted across different sites. From a feed coal of -50mm + 12mm that was beneficiated, the quality of the product streams was investigated. An improved coal quality of 30% ash content and total sulphur of 0.58% was achieved from a feed coal of 36.9% and 1.03% total sulphur. The demonstration shows a 5-7% ash upgrade to the coal feed tested. Furthermore, the findings reveal an EPM value of 0.082. The project demonstrated the efficiency of Air Plant technology for destoning, as the results indicate quality improvement with minimal yield losses. Air plant has indicated great potential as an alternative method for preconcentrating coal, while also promoting sustainable practices that contribute positively towards ESG (Environmental, Social, and Governance) principles.