Closed-circuit machines equipped with a two-deck screen offer the ability to produce up to three different sizes of product. The top deck might be screening materials 50mm or less, the bottom deck 25mm or less, with the oversized material either being fed back to the hopper for additional crushing or, with the installation of flop gates, kept as a third product for sale. Similarly, three-deck plants are required when production specifications require four different size classifications.
Due to the economic transformation, the demand for sand and gravel aggregates in China will slow down. However, the report predicts that by 2020, China will still be the world's largest aggregate demander, accounting for almost half of the world's total aggregate.
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In China, the artificial sand was mainly used in the construction of hydropower systems. For example, the Three Gorges Project and the Yellow River Xiaolangdi Project used artificial sand to prepare concrete. Due to the remote environment of the hydropower project and the high quality of sand and gravel, the projects have taken the materials locally.
In general, crushing is carried out in three stages, depending on the desired size of the material.
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The material is ground by repeated contact with these hammers, contact with the walls of the grinding chamber, and particle to particle contact. The material remains in the grinding chamber until it is suitably sized to pass through the perforated screen that covers the bottom half of the grinding chamber. Hammers are made up of either MS, EN or Mn. block, which are hardened up to required hardness. The material is contacted by those series of rotating hardened hammers.
In a size-class comparison, Nordberg® HP100™ cone crusher a higher output capacity, higher density in the crushing chamber and better reduction ratio, producing higher on-spec yield end products with the same energy consumption. Nordberg® HP100™ cone crusher is equipped with the latest high-efficiency motors, making it efficient and ecological crushing machine.
The laboratory hammer crusher is a crusher that directly crushes materials with a maximum particle size of 50-150 mm to below 1, 3, 6, and 13 mm for laboratory sample preparation.
The output from the primary crusher is conveyed onto the primary stockpile from which the secondary crusher is fed. There is a screen house just after the secondary crusher which screens out small size crushed stone and dust onto blinding stockpiles. The larger sized stones pass through to the final crushing stages where they are fed through a series of cone crushers and screens. The output from the final cone crushers is conveyed to a screen house where large multiple deck screens sort the crushed stone into the required aggregate sizes.