Trends in the Crushing of Mineral Ores

Mining Industry

Summary: Ore crushing processes have not changed very much in recent years. Never­theless; there have been significant modifications to the machine technology and to the systems. In this article, the most important topics are discussed and the current trends are presented.

1 Introduction

Crushing is an important step in the complex process of mineral processing (Fig. 1). In open pit mines, rock chunks with edge lengths of 2 m have to be processed. In underground mines, the biggest chunk sizes are about 0.5 m. Crushers have the task of reducing the ore rock to particle sizes in the millimetre range for subsequent grinding. The grinding process produces particle sizes in the micrometre range. The energy costs for the crushing process, which consumes less than 1 kWh/t are generally rather low compared to the grinding process, which can require 20 kWh/t and more....

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