Primary and Secondary DDC-Sizers

McLanahan DDC-Sizers are direct drive crusher-sizers that are used in the primary and secondary reduction of friable, low-silica minerals. Used in both surface and underground mining operations, these sizers can reduce materials such as coal, salt, gypsum, phosphate, limestone, bauxite, petroleum coke, lignite, trona, carbon anodes, oil sands, clay, shale and more.Inward rotating rolls on primary and secondary sizers allow under-sized feed material to pass through the crushing zone and backside of the rolls where they intermesh with the sizing combs. This creates a screening effect and minimizes additional fines generation that can be created through inter-particle crushing.

Unique to McLanahan designed primary and secondary DDC-Sizers is hydraulic adjustability of one of the sizing rolls. This feature allows producers not only the option of maintaining original size specifications when crushing, but also gives them the ability to adjust if product size requirements change. The hydraulic adjustable roll also allows producers to control product specifications when compensating for tooth wear.

DDC-Sizers have a direct drive arrangement and low-profile design that allows wheel mounting for a movable configuration. The preferred method of installation is to mount the unit on rails with a non-rigid connection between the feed and discharge chutes. Since the drives are attached to the mainframe of the sizer, the entire unit can be rolled out from the feed stream to facilitate maintenance. McLanahan DDC-Sizers are equipped with hydraulic lift cylinders for ease of wheel activation.

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Case Studies

New Acland Coal Mine Improves Wear Life, Eliminates Bottlenecks With DDC-Sizers

New Acland Coal Mine, a part of the New Hope Group, began production in October 2002. Since that time, they have expanded their operation and production to the current point of 4.8 million tons per year. READ MORE