First, the old-fashioned coal selection, the defects of coal crushing equipment: 1. Large-scale, high-efficiency and durable coal preparation equipment – ​​high-efficiency crusher has become an indispensable part of modern coal mine production resources. Western countries require ash to 8% for coal char fine coal. The United States stipulates that power plants are not allowed to use more than 1% of thermal coal. Therefore, whether it is coking coal or thermal coal, it must be washed or screened. Nearly all of the raw coal in Germany, Britain, France and Japan was selected. The raw coal not selected in the United States was low-ash powdered thermal coal, but it was also screened to remove large pieces of vermiculite with a selective crusher.
The crusher plays an important role in the coal preparation line. At present, most of China's coal preparation production lines have old-fashioned equipment, such as old-fashioned coal preparation and coal-crushing equipment. These old-fashioned crushing equipments are backward and have major defects:
1. Low output; 2. High energy consumption; 3. High production cost.
Second, the application advantages of high-efficiency crusher in coal preparation production line:
How can we solve the problem of old-fashioned coal preparation, backward coal crushing equipment, low efficiency and high cost? At present, the use of new crushers has made this improvement now, and the new design and efficient design of crushers and coal preparation machinery. The coal preparation process is not possible with the old-fashioned coal preparation machine, and it is also a new generation of the old-fashioned coal preparation process.
2. At present, the maximum processing capacity of the jig and heavy medium sorting machine has reached 1000 tons/hour, and the maximum flotation machine is 50 tons/hour. The new coal washing plant in the Heilongjiang mine in Germany uses a combined washing system, which means that only one large set of equipment is used in each process, and there is no backup, which greatly simplifies the whole process. The main equipment uses only one lump coal jig and one coal jig and one 400 t/d centrifugal dewatering machine.
3. The use of jigs for coal selection still dominates. Germany has successfully developed the Batak type jig based on the introduction of the Japanese high-sand sieve air jig. The coal separation index is comparable to that of heavy medium coal preparation.
4. Heavy medium coal preparation is simple in process, small in area, high in recovery rate of clean coal, and heavy selection in countries such as the United States, France, Poland, Australia and Czech Republic. The large-diameter heavy medium cyclone is used as the main selection equipment, and the raw coal is broken to below 44 mm.
5. Due to environmental protection requirements, the international treatment of coal slurry water is very important. The French coal preparation plant has basically achieved a closed cycle of washing water. The treatment method is generally concentrated with a coagulant and then dehydrated with a filter press.