Since beginning of 21st century, while global automobile industry flourished, the scrapped amount of used tires has grown rapidly.
The annual output of used tires is 9.5 million tons, and the recycling rate is less than 25%.
At present, China produces 100 million pieces of used tires every year, and recycling rate is only about 15%.
The tires are only 10-15% of the natural loss of rubber from the beginning to the end of use.
However, 90% of the tires and 100% of the tire frame materials are disposed and not recycled, which not only causes a lot of waste of resources, but also causes great harm to the ecological environment.
Tyre Pyrolysis Plant,Used Tyre Pyrolysis Plant,Continuous Tyre Pyrolysis Plant Shangqiu Zhongming Eco-Friendly Equipment Co., Ltd. , https://www.sqzhongminggroup.com
Lower shaft development plan
The development of the lower shaft is a common method for exploiting the steep ore body. The shaft is placed outside the moving boundary of the lower part of the ore body (while retaining a safe distance), as shown in Figure 7-5a . A number of stone gates are drilled from the shaft to connect with the ore body. The advantage of this scheme is that the wellbore maintenance conditions are good, and there is no need to keep the security pillars; the disadvantage is that the deep stone gates are long, especially when the ore body inclination angle becomes small, the Shimen wellbore maintenance conditions are good, and there is no need to leave the security pillars; the disadvantage is deep The stone gate is long, especially when the dip angle of the ore body becomes small, and the length of the stone gate increases sharply with the increase of the mining depth. Generally speaking, the ore body inclination angle of 60o or more is most advantageous, but the ore body inclination angle is about 55o . This method can also be adopted as a small mine. Due to the small lifting equipment in small mines, blind deep shafts (secondary lifting) can be used to reduce the length of the stone gates (see Figure 7-5b ).