Experimental study on the macerals enrichment of Shenhua low-rank coal by Falcon centrifugal concentrator

ABSTRACT

This paper studied the macerals enrichment of the low-rank coal which produced by Shigetai Coal Mine, Shenhua Group. The coal sample fed to the Falcon were the product of the rod mill after 10 minutes grinding. Three factors were carried out, rotational frequency, feed rate and water pressure. The orthogonal experiment was designed to investigate the interaction between the three factors and a model was established between the factors and response values. Taking the vitrinite recovery rate as the response value, there was an interaction between the rotational frequency and the water pressure, moreover, the effect of the rotational frequency on the vitrinite recovery rate was greater than the water pressure, while, the feed rate on the vitrinite recovery rate was not significant. Taking the vitrinite enrichment ratio as the evaluation index, the Quadratic model was recommended, there was an interaction between the rotational frequency and the feed rate, moreover, the rotational frequency had better response to the vitrinite enrichment ratio than the water pressure and the feed rate. In order to optimize the experimental conditions, and the vitrinite enrichment ratio was set to 1.2, the vitrinite recovery rate was the larger the better, the optimal separation conditions obtained were the rotational frequency 30Hz, the water pressure 0.03MPa, and the feed rate 15ml/s in the laboratory.

KEYWORDS:

• Low-rank coal
• macerals
• enrichment
• Falcon concentrator
• centrifugal force

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant No. 51874303.