FLOWCHART FOR PNEUMATIC PREPARATION OF HIGH ASH COAL GRADE D

This study aimed to develop a flowchart for pneumatic preparation of high ash coal grade D (long flame coal). To this effect, lab-scale sieve analyses of this type coal were carried out. It is found that size grades of 50–100 mm and 6–13 mm feature medium dressability while size grades 25–50 mm and 13–25 mm are easy coal. For this reason, it is advisable that coal dressing process produces two products: concentrate and rejects, without middlings. Ash content was 23.3% in the test sample of coal and ranged from 12.8 to 28.0 in separate size grades. Based on literature data, the lower size limit for coal cleaning was assumed as 6 mm. The quantitative and qualitative analyses show that the highest yield of ultimate concentrate at preset ash content is reached in processing of two size grades: 25–100 mm and 6–25 mm. The ultimate concentrate yields with ash contents of 11, 12 and 13% made 44.2, 59.9 and 65.4%, respectively. From the numerical modeling, it is found that production of the ultimate concentrate with the ash content of 11–12% requires that concentrate 25–100 mm in size has ash content 0.5% lower than the preset value and concentrate 6–25 mm in size has ash content 0.5% higher than the preset value. The rational specific gravities for density-based separation of coal to ensure production of concentrate with the preset ash content were determined. The flowchart proposed for test coal beneficiation includes: pre-screening of ROM coal to 100 mm in size; crushing of 100 mm size grade; preparatory screening to obtain size grades of 25–100 mm and 6–25 mm; cleaning of these size grades by pneumatic separation towards production of concentrate and rejects. Siftings -6 mm with ash content of 28.0% are withdrawn from processing.

For citation: Lavrinenko A. A., Golberg G. Yu., Lusinyan O. G., Kuznetsova I. N. Flowchart for pneumatic preparation of high ash coal grade D. Gornyy informatsionno-analiticheskiy byulleten'. 2019;3:199-209. [In Russ]. DOI: 10.25018/0236-1493-2019-03-0-199-209.

Keywords

Coal grade D, dressability, beneficiation, pneumatic separation, quantitative/qualitative flowchart; machine flow sheet, concentrates, ash content, density-based separation parameters.

Issue number: 3
Year: 2019
ISBN: 0236-1493
UDK: 622.767
DOI: 10.25018/0236-1493-2019-03-0-199-209
Authors: Lavrinenko A. A., Golberg G. Yu., Lusinyan O. G., Kuznetsova I. N.

About authors: A.A. Lavrinenko, Doctor of Technical Sciences, Head of Laboratory, G.Yu. Golberg, Candidate of Technical Sciences, Senior Researcher, e-mail: gr_yu_g@mail.ru, O.G. Lusinyan, Candidate of Technical Sciences, Leading Engineer, I.N. Kuznetsova, Candidate of Technical Sciences, Senior Researcher, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia. Corresponding author: G.Yu. Golberg, e-mail: gr_yu_g@mail.ru.

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