equipment of Granite ore mining

The basic requirements and characteristics of granite mining is adopted to meet certain specifications and complete fractures stone - blocks from the ore body. The layout of the mining face to open up the choice of mode of transport, to give full consideration to the orebody bedding, joints, fissures, and avoid the adverse effects of mining, to ensure that the chunk of blocks of recovery.

factory for Granite mining

Granite mining, the first mining area first according to the resource conditions and market demand to determine the mining realm, mine production scale, and mine work system. Mining on the basis of comprehensive analysis of the natural environment, economic and technological conditions. The mining process can be divided to explore the transport, stripping and mining.

A. Pioneering transport and loading

To open up the transport task is to open up mining industrial area to the mining transport pathways between the various work steps of the venue and transport pathway to the waste rock field. The granite commonly used in open pit pioneering modes of transport are:

1) the road to open up the motor transport, flexible in this way can give full play to the efficiency of the loading equipment is widely used.

2) ditch to open up the mast crane lifting, this method does not need to dig a transport channel from the surface to the mining step, directly from the mast crane load transport equipment. This method works a small amount, less investment, but subject to the limitations of the mast crane capacity and scope of work, poor flexibility.

In addition, the slope hoist Road to open up the trolley transport, road cars and mast crane explore and transportation. Blocks loaded on transport equipment, loading equipment fixed and shift operation and style categories. Mast crane is a fixed type, such equipment lifting height, lifting volume, both the loading and transport functions; crawler cranes and tire crane mobile loading equipment, such equipment is flexible, but the lifting height. from the weight of small, not suitable for large-sized blocks of load. Transport of mine waste rock commonly used artificial cart before the installed capacity, bulldozers, cranes, cars and other equipment.

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Mining in stripping overburden, weathered layer, laminated, wall rock, and broken and no exploitation of the value part of the ore surface. Granite mining process separation, fragmentation and plastic.

1) separation processes commonly used method splitting separation, drilling and blasting, separation, and flame cutting separation and joint separation. Splitting separation: certain iron wedge according to a certain pitch directly into the rock, the rock cracks need to generate. This method applies to small-scale mines, low cost, but the efficiency is low. Another method is drilling separation expanders, water tune Hao expanders, poured into the drilled rows of eye, the use the expanders hydration of the expansion force Splitting the rock, this method is simple, safe, However, the efficiency is low.

Cut separation of the flame: flame cutting machine nozzle high-speed flame, heating of the impact of rock, different minerals in the rock thermal response characteristics, resulting in burst peeling, and gradually form the separation trench. The Act applies only to the high quartz content, heat capacity and poor thermal conductivity of the rock such as granite, diorite, syenite, and so on.

Drilling and blasting separation: to lay the row of eyes on the rock by the rock drill, as needed into the blasting material (the currently used black powder, burning agents, detonating cord), to control the blasting, the method is high efficiency and wide application. However, use should be strictly controlled blasting power to avoid harmful cracks.

2) segmentation process: will the separation of stone from the rock on the top stone (or capstone package) overturned, and then, as the fissures law and blocks specifications, using the splitting method of stone split into the required blocks .

3) shaping processes: split the good blocks, which do not meet the requirements, needs plastic surgery. Commonly used brazing method of hand hammering or shaping machine, remove the blocks extra parts to make it smooth and neat corners.

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Under normal conditions, the production stripping ratio around 0.3, the minimum economic blocks of granite mining rate of 15% to 25%.

(1) mining step height using a mobile crane, step height 4 ~ 6m; small mast crane, step height is less than or equal to 14m; large mast crane, the step height is less than or equal to 62m. Sub-steps of the slope angle is generally 90 °, determine the final slope angle as the rock stability.

(2) stone width as the mining equipment performance, blocks specifications and cracks to determine the general 1 ~ 3m

(3) artisanal mining face length is 5 ~ 15m; flame cutting machine mining 15 ~~ 20m. Minimum work platform width: 20 ~ 25m.