1 Empty field method In the process of mining, it divides the ore into two parts: mining room and pillar. 2 When returning to the mining room, the stope exists as an open field. 3 It uses the stability of the pillars and surrounding rock mass to maintain the goaf. 4 After the mining house is finished, it is necessary to return to the mining column in time and timely process the gob area. (This is timely - refers to planned handling) In general, the return of the mining column to the goaf is carried out simultaneously. Sometimes in order to improve the mining conditions of the pillars, the mines are filled in advance and then returned to the mining column by other methods. 5 During the mining process, the stope mainly relies on the retained pillars or permanent pillars for natural support, sometimes supported by artificial pillars. (1) It is suitable for deposits where the ore and surrounding rock are stable. (2) The goaf is allowed to have a large exposed area within a certain period of time. Several methods currently used in the open field mining method are: (1) House column method (including comprehensive method) (2) shallow hole retention method (3) Segmentation method (4) Stage mining method (including various schemes for thin ore and horizontal thin ore) (5) Other mining methods and their deformation schemes
Aluminum Door Big HandleFEATURES:
Aluminium is a chemical element with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic and ductile metal in the boron group.
Light, durable and functional: these are the qualities that make aluminium one of the key engineering materials for various applications. We can find aluminium in the homes we live in, in the automobiles we drive, in the trains and aeroplanes that take us across long distances, in themobile phones and computers we use on a daily basis, in the shelves inside our fridges and in modern interior designs, but a mere 200 years ago very little was known about this metal.
• Aluminum castings can allow the attainment of complex designs and forms. This means that manufacturers can easily order customized castings that will be suitable for their production Aluminum Door Big Handle Aluminum Door Big Handle,Aluminum Door Handle,Square Aluminum Door Big Handle,Aluminum Rosette Door Big Handle Zheke Mould Technology Co. Ltd. , http://www.zkdiecasting.com
Second, the applicable conditions of the empty field mining law
Third, the classification of empty field mining law
needs.
• Aluminum castings allow producers to manufacture parts at an extremely higher and faster rate than other alloy materials. Aluminum Die Casting can also achieve near net shape so the process of machining can be eliminated to produce finished parts.
First, the characteristics of the empty field mining law