Suggestions of coal gangue crushing process: 1. If the particle size is about more than 40mm, we often choose jaw crusher for coarse crushing together with hammer crusher or other crushing equipment for tertairy crushing. And the crushing process is commonly used in production line. For example, the crushing line in Beijing, Shandong, Jilin, Liaoning and Heilongjiang and so forth. If particle size is less than 40mm, coal gangue can directly be sent into tertariy crusher for second stage crushing, turning two-stage crushing or three stage crushing into one-stage or two-stage crushing. Thus not only save power,but also simplifies the production processing. For example, Tonghua, Jilin Bureau of Mines Iron Works of gangue material, most of the particle size below 30 mm; If gangue with partical size below 2mm accounts for more than 20%, it is recommended the raw materials should first get through vibrating screen, after which materials above screen go for coarse crushing and fine crushing, and materials under screen directly go into the mixer before the aging library. This method of shaker + coarse crushing + fine crushing process has two advantages: First, improve the production capacity of the crushing equipment, because the materials which passed through screen does not need to enter the coarse crushing or fine crushing equipment; Secondly, the electricity is saved, 20 percent of the materials under screen does not need crushing, which means crushing equipment can be reduced by 12 sets. It not only reduces investment in equipment but also reduces power consumption significantly.
The physical properties of coal gangue is essential to the selection of raw material grinding equipment. The selection to crushing equipments should allow for the moisture content, hardness and particle size. Some manufacturers use crushing machine suitful for low moisture content materials to break the high moisture content of the gangue; Or crushers suitful for high hardness materials be used for the low hardness of the soft gangue; Or crushers whose model don't match to material size. All of above are not proper for crushing materials and choosing equipments.
The coal utilization plays a tremendous role in promoting socio-economic, and also has significant impact on the environment. Gangue and coal bed methane, the main waste generated by the coal development process, have long been regarded as hazardous substances and severe gas. In terms of the growing energy shortage situation, people gradually realized these wastes are still available for creating value. Therefore, raymond mill and broken equipment get vigorously applied and create considerable economic benefits for users.
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