In the process of machine-made sand and gravel processing, it is very important to master the properties of the source rock, such as the physical and mechanical properties of the rock, the mineral composition, the chemical composition, and the processing performance indicators of the rock. The main things to understand are the crushing work index and the abrasiveness index. These two indicators are important reference indicators for the initial selection, subsequent production and processing, and maintenance of sand and gravel equipment. In simple terms, they are the crushability and abrasiveness in rock processing performance.
1. Rock crusher
The crushing work index WI is usually used to characterize the crushability of the rock. It is closely related to the chemical composition of the rock, the degree of development of the joints (which can also be understood as the cracks of the rock), and the crystallization state. For example, hard quartzite is difficult to crush, while limestone is much easier. The crushability of the rock affects the output particle size of the crushing equipment, and then affects the selection of the equipment. The crushability of the rock is usually divided into 14-22 according to the range of the crushing work index: 14-22, extremely difficult to crush. Moderately crushable limestone is widely used in daily civil engineering. Common hard rocks in hydropower projects include deep-seated igneous rocks (such as granite, syenite, diorite) and eruptive igneous rocks (such as basalt and diabase). Typical hard rock indicators commonly used in sand and stone processing.
2. Rock abrasiveness
The abrasiveness of rocks is usually measured by abrasiveness index AI and SiO2 content, which is related to factors such as the hard mineral content of the rock (SiO2, orthoclase, etc.), crystal structure, raw material particle size, and rock compressive strength. The abrasiveness of rocks mainly affects the life and wear cost of wear-resistant parts during equipment operation, so the abrasiveness of rocks is an important parameter for determining equipment selection. According to the rock abrasiveness index, the rock abrasiveness grade is: 0.40.8, which is relatively high in abrasiveness.
