Utilization of the secondary hard coal preparation in clean coal technologies

Mining of Sustainable Development

生态环境科学

Pielot, J.^1

Silesian University of Technology, Faculty of Mining and Geology, 2 Akademicka Street, Gliwice

44-100, Poland^1

关键词: Ash contents;    Clean coal technologies;    Clean technologies;    Coal concentrates;    Gravity separation;    Preparation plants;    Production value;    Separation curve;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/261/1/012040/pdf
DOI  :  10.1088/1755-1315/261/1/012040

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Hard coal remains a valuable power raw material, especially in aspect of clean technology application. The first stage of these technologies is to prepare coal concentrate of low ash content. The paper illustrates the quantitative growth of production value of good quality concentrate by means of concentrate re-preparation using two jig system. Jigs separation curves present the shape that diverge from perfect curve; this fact causes that incorrect grains appear during gravity separation process. Secondary preparation in jigs improves the shape of resultant separation curves. Due to this fact, in two jig system, at the same demanded ash content of final concentrate it is possible to gain the significantly greater production value than in case of single jig-especially in case of small demanded ash content. Increase of production value is especially meaningful in case of hard-dressed coal. If there are more jigs in preparation plant, thus the purposeful operation is to use them properly by means of economically profitable secondary preparation utilization. During secondary preparation it is possible to gain concentrate of lower ash content than in case of a single jig.