SciELO - Scientific Electronic Library Online

 
vol.114 issue11Liquid-liquid extraction and separation of copper(II) and nickel(II) using LIX®984NBeneficiation of marble from Griekwastad, Northern Cape Province author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

Abstract

KUMAR, S.; BHATTACHARYA, S.  and  MANDRE, N.R.. Characterization and flocculation studies of fine coal tailings. J. S. Afr. Inst. Min. Metall. [online]. 2014, vol.114, n.11, pp.945-949. ISSN 2411-9717.

The re-use of waste water from coal preparation plant tailings is always desirable, but is generally problematic in terms of solid-liquid separation. Dewatering and disposal of coal slurry at a high percentage of moisture poses a major technological and environmental challenge to mining and mineral processing industries world-wide. Characterization and floccu-lation of these coal tailings reveals that the separation of fine coal tailings depends on factors such as size distribution, slurry viscosity, zeta potential, pulp density, circuit design, plant operating parameters, and the behaviour of solid particles in an aqueous medium. The present study was carried out on -600 mm coal tailings collected from a coking coal preparation plant of Jharia Coalfield, India, using anionic flocculent. Characterization studies revealed that the zeta potential was highest (-44 mV) at a pH of 9.0, the size range of the particles was 1.1-700 μτη, and the average ash content was 62.57%. Flocculation studies were performed at different solid concentrations, pH values, and polymer dosages. The results indicated an efficient settling rate of 178.15 mm/min at 8% solid (w/w) at a flocculent dosage of 32.50 g/t solid. The turbidity of the clear liquid obtained was 7.42 NTU.

Keywords : flocculation; coal fines; settling; dewatering.

        · text in English     · English ( pdf )