Resumo

MARTINS-POLE, Francisco; COELLO-VELAZQUEZ, Alfredo Lázaro; MENENDEZ-AGUADO, Juan María  e  SIERRA-FERNANDEZ, Carlos. Influence of mill rotation speed on indicators of autogenous grinding of kimberlitic ores of Catoca, Angola. Min. Geol. [online]. 2020, vol.36, n.4, pp. 451-464.  Epub 30-Dez-2020. ISSN 1993-8012.

The diamonds production has a great impact on the economy of the Republic of Angola, in which Catoca plant is of particular relevance. The autogenous grinding plays an important role in the technology of processing kimberlitic ores, as it has the purpose of achieving the release at the coarsest possible sizes. In order to evaluate the influence of the rotation speed and the pulp density on the energy efficiency indicators of the mill, a series of tests was designed considering three speed levels (55, 65 and 80 % of the critical speed) and two levels of dilution (dilute pulps, 45-50 % solids, and dense pulps 55-60 % solid). A sampling system was organized in the industrial facility that allowed evaluating the size distribution of the particles in the mill discharge and the power consumed by its motor and its capacity were recorded. At the same time, the specific energy consumed by the mill was evaluated. The results show that both operational factors have a decisive influence on the indicators studied. The higher the density of the pulp and the rotational speed of the mill, the larger the size of the mill outlet. The speed of rotation strongly influences the energy consumption of the installation.

Palavras-chave : energy-technological indicators; autogenous grinding; pulp density; turning speed; energy efficiency; kimberlitic ores.

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