In the ore dressing production, in order to balance the production load between the crushing sections, it is often necessary to quickly and accurately adjust the size of the discharge port of each crusher according to the wear condition of the broken liner and the requirements of each section of the product. In the absence of actual data, the typical particle size characteristic curve of each crusher crushing different hardness ores is usually used. The curve is averaged by a large amount of production data. The production practice proves that the shape of the obtained product grain size characteristic curve is similar when the same type of crusher crushes the ore with similar hardness and similar shape under different discharge port sizes. For ease of use, the abscissas of these curves are not directly represented by the granularity, but by the relative granularity, ie
The size of the fractured discharge port can be easily determined by using a typical particle size characteristic curve. For example, Figure 8 shows a typical particle size characteristic curve when a jaw crusher breaks three different hardness ores. If a ore dressing crushed ore is medium hard ore, the maximum particle size (dmax) of the product is required to be value="20" unitname="mm" w:st="on">20.0mm, from Figure 2-5. The relative maximum particle size Z max = 1.6 is found on the curve, and the width of the discharge port is
Figure 8 The typical particle size characteristics of three different hardness ores can in turn be judged based on the determined width of the discharge port to determine the maximum particle size of the resulting crushed product. For example, after the adjustment, the actual width of the discharge port is measured as value="15" unitname="mm" w:st="on">15mm, then the maximum particle size of the broken product in production is: d max = Z max · e = 1.6 × Value="15" unitname="mm" w:st="on">15mm=value="24" unitname="mm" w:st="on">24mm
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