First, the roadway excavation method and the selection of mechanical equipment should meet the following requirements:

1 Full coal roadway and coal rock roadway excavation should be carried out by drilling and blasting .......

(1) picking

In-pulse acquisition system: the tunnel is usually excavated from the extra-vehicle transportation roadway, and the inner courtyard of the vein is drilled from the vein-passing roadway, and the transportation level is communicated with the .......

First, safety procedures

1. Personnel in contact with explosive materials in the upper and lower parts must wear cotton or antistatic clothes.

2. The electric detonator must be transported by the blaster in person, and the explosive should be t.......

In order to ensure the normal operation of distribution transformers, it is necessary to strengthen the operation and management of the distribution transformers, do a good job in the operation and maintenance of the transformers, analyze the phenomenon according t.......

1. Flotation and its role in mineral sorting.

Flotation: A method of separating various fine particles according to the difference in physicochemical properties of mineral surfaces.

effect:

(1) The adaptability of flotation is strong

Dump trucks, also known as

Dongfeng Tianjin .......

The constituent elements, the mining, cutting and mining processes and the hydraulic filling method of the cement filling mining method are basically the same and will not be repeated. Only the differences are described below.

Dewatering after hydraulic filling is critical, and the speed and quality of dewatering directly affects the efficiency and quality of mining.

There are two ways to solve the dehydration: one is overflow dehydration and the other is percolation dehydration.

(1) Overflow dehydration .......

With the continuous development of information technology, computer networks and information encryption and identification technologies have gradually been applied to the application of electronic ticketing services in scenic spots.

Scenic electronic ticketing.......