Destoning the Moatize Coal Seam, Mozambique, by Dry Jigging
Carlos Hoffmann Sampaio,
Weslei Monteiro Ambrós,
Bogdan Cazacliu,
Josep Oliva Moncunill,
David Selemane José,
Gerson Luis Miltzarek,
Irineu Antônio Schadach de Brum,
Carlos Otávio Petter,
Eunírio Zanetti Fernandes,
Luis Felipe Silva Oliveira
Affiliations
Carlos Hoffmann Sampaio
Departament d’Enginyeria Minera, Industrial i TIC (EMIT), Escola Politècnica Superior d’Enginyeria de Manresa (EPSEM), Universitat Politècnica de Catalunya (UPC), Av. Bases de Manresa 61–63, 08242 Manresa, Spain
Weslei Monteiro Ambrós
Mineral Processing Laboratory, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre 91501-970, Brazil
Bogdan Cazacliu
Gustave Eiffel University, Aggregates and Materials Processing Laboratory, Route de Bouaye-CS4, CEDEX 44344 Bouguenais, Nantes, France
Josep Oliva Moncunill
Departament d’Enginyeria Minera, Industrial i TIC (EMIT), Escola Politècnica Superior d’Enginyeria de Manresa (EPSEM), Universitat Politècnica de Catalunya (UPC), Av. Bases de Manresa 61–63, 08242 Manresa, Spain
David Selemane José
Instituto Supeior Politécnico de Tete, km 1, EN7 Matundo, Tete, Mozambique
Gerson Luis Miltzarek
Mineral Processing Laboratory, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre 91501-970, Brazil
Irineu Antônio Schadach de Brum
Mineral Processing Laboratory, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre 91501-970, Brazil
Carlos Otávio Petter
Mineral Processing Laboratory, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre 91501-970, Brazil
Eunírio Zanetti Fernandes
Instituto Tecnológico Vale (ITV), Av. Juscelino Kubitscheck, Ouro Preto 35400-000, MG, Brazil
Luis Felipe Silva Oliveira
Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55e66, Barranquilla 080002, Atlántico, Colombia
This paper proposes pre-beneficiation studies by air jigs of the coal layers from a Moatize coal deposit. Pre-beneficiation, also called destoning, removes tailings before the beneficiation plant. The air jigs operate in the same granulometric size range as the heavy-media cyclones (HMCs) that are installed in the preparation plant. With the destoning, the heavy-media circuit operates with a lower coal feed and higher organic matter contents, increasing its cutting efficiency and lowering operational costs. The use of air jigs reduces the total water consumption in the plant, which is especially important for the region where the plant is installed, as water is particularly scarce. Four coal layers of the Moatize coal deposit were studied, which are currently exploited in the mine. As main results of the study, it is possible to say that the concentration of lights (feed of the preparation plant) and heavies (waste fraction) in air jigs can be carried out with reasonable efficiencies for all coal layers studied, making air jigs a feasible option for coal destoning.