Effects of Two Important Parameters on Capacity of a Laboratory Jaw Crusher of Different Coals: Choke Feed Level and Effective Reduction Ration

Abstract

In this study, the effects of three different choke feed level (1=1, 1=2, and 1=4) and four different effective reduction ratios (2.5, 5, 10, and 20) depend on the capacity of the crusher of the three different characteristic coal samples in a laboratory Jaw crusher were investigated.Instead of the one-stage reduction, the capacity of the jaw crusher with a three-stage reduction has been an increase of between 38% and 82% according to coal type. Additionally, size distributions of products become more homogeneous.In addition to coal types, choke feed levels and reduction ratios are one important factor at the selection of crusher type.

Effect of chemical, mineralogical, and petrographic properties on the grindability of a South African Highveld coal

“…Coals which have lower HGI values grind or pulverize with difficulty and subsequently result in erosion and damage to the plant crushers and pulverizer parts (Falcon and Ham, 1988;Sligar, 1998;Deniz, 2011). Furthermore, these materials require high energy to pulverize.…”

“…On the other hand, the float samples containing higher proportions of carbon associated with macerals and lower proportions of inherent mineral matter (including kaolinite and quartz) can be harder to grind than the sink fraction. These float fractions are thus postulated to have lower HGI values and a higher organic carbon content, thereby requiring higher energy to grind (Sligar, 1998;Deniz, 2011).…”

“…Grinding of coal incurs a significant energy cost (5 to 15 kWh/t- (Sligar 1998;Khoshjavan, Khoshjavan, and Reza, 2013). The presence of mineral matter, including quartz, pyrite, and microcline in the coal particles, which are harder than steel, can contribute significantly to equipment wear during pulverization or milling (Falcon and Falcon, 1987;Tiryaki and Dikmen, 2005;Deniz, 2011). The extraneous or discrete minerals in the coals are those minerals which are not associated with the carbon matrix.…”

Production of Water-Resistant Briquettes from a Mixture of an Imported Bituminous Coal and a Turkish Lignite with Copolymer Binder

“…As in the grinding, concentration, and combustion properties of coal, briquetting is also related to its physical properties as well as its rank, chemical, and petrographical compositions [2].…”