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A case in point is the port land cement plant, which is frequently started as a one-kiln plant, but which is usually so arranged that additional kilns, grinding units, and auxiliary apparatus can be installed alongside the original machines. In a plant of this character the primary crusher, and its auxiliaries, are a minor part of the total investment, even as compared to the cost of the original single-unit installation. Furthermore, most cement plants are supplied from open-pit workings, utilizing power shovels for loading the raw materials; hence the primary crusher must usually be of medium-to-Iarge proportions to provide sufficient receiving opening. These facts have led quite logically to the almost universal practice of installing primary crushing departments, in such plants, large enough to take care of ultimate anticipated requirements. |
