There are two types of de-dusting methods: one is wet de-dusting and the other is dry de-dusting. The two types of dust removal methods have different effects. .
The dry de-dusting system of the drilling rigmainly consists of filters and air ducts. In the process of drilling tool gouging, rock dust is blown out of the hole. .
Wet de-dusting is done by mixing the pressurized air with water through a mixer and pumping the water from the tank to the water pipe. The compressed air. [pdf]
Guyuan is the oldest city in Ningxia, being established in 114 BC as Gaoping, capital of . It was a stop on the . During the , Guyuan belonged to the territory of Qin state, later Qin Dynasty. The original name of the city began in the Ming dynasty (1452 AD). Because of the importance of its transportation in history, Guyuan was a war gate where Chinese soldiers trained and prepare. [pdf]
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