The production of open-pit mine is inseparable from crushing equipment. The use of appropriate crushing station can effectively reduce the conveying particle size of ore and rock and improve the production efficiency. The surface crushing station of open-pit mine is divided into mobile, semi mobile, semi fixed and fixed according to the fixation degree of crushing equipment and foundation. Fodamon engineers analyzed and compared the classification, advantages and disadvantages of these four crushing stations, hoping to bring some help to your choice.
Mobile crushing station
Generally, it integrates feeding, crushing and conveying. The walking adopts crawler type or tire type (also stepping type), and the position can be adjusted at any time with the movement of the working face in the stope.
Replace the dump truck, reduce the procurement cost, reduce the transportation cost by 50% ~ 70%, reduce the cost of spare parts, reduce the labor cost and reduce the maintenance of stope pavement, which has the characteristics of safety and environmental protection. Because it is a trinity equipment and the continuous transportation equipment connected with it is a belt conveyor, the crawler mobile crushing station is suitable for large-scale open-pit mines and is suitable for large-scale and continuous mining technology.
The equipment is complex and expensive, and the one-time investment is too large.
Semi mobile crushing station
Semi mobile crushing station, also known as modular unit or sled unit, is to place the machine body on the appropriate working level in the open pit and move the crushing unit as a whole (or separately) with the advancement and extension of the working steps by crawler transporter or other traction (pulling) equipment.
A modular unit consists of three parts: first, equipment such as crushing, screening or feeder. Second, non-standard design and production parts such as steel structure support, hopper and buffer silo. Its three steel grating platforms, italics, handrails and other standardized design and fabrication parts.
The most typical feature of the semi mobile crushing station is that it is connected with the ground without concrete foundation. Its service life ranges from several months to several years, and its one-time migration time usually does not exceed 48h.
In addition to the relocation time, an important feature of the difference between semi mobile crushing station and mobile crushing station is the location of equipment layout. Semi mobile crushing station is usually arranged on the working slope of the stope, and the ore and rock transportation distance is less than 3km. When the stope step extends to the reasonable transportation distance and climbing height of the truck, the next relocation can be carried out.
It not only has the advantage of being mobile, but also overcomes the disadvantage of semi fixed station construction and long relocation time:
a. Overall design and supply: standard parts such as main equipment, non-standard parts of steel structure and walkway escalator are designed and supplied in a complete set, which saves time and labor for the owner, and the construction and installation are fast and efficient.
b. Short construction period: it can be manufactured and pre assembled in the factory, disassembled and shipped to the project site for rapid assembly after eliminating installation faults. Each component is connected by bolts, almost without on-site welding, which is conducive to rapid construction and production.
c. More reasonable investment: less civil work, no concrete construction above the ground, low labor intensity, higher proportion of equipment and steel structure investment in the total investment, and the steel structure still has high residual value after a certain number of years.
d. It has the ability of mobile transfer and can be disassembled and transferred to another place for re installation, but the transfer frequency should not be too high.
Semi fixed crushing station
Semi fixed crushing station is a transition mode from semi mobile crushing station to fixed crushing station. From the connection with the ground, the crushing frame has a solid connection with the ground (anchor pile can be used for the bedrock, and reinforced concrete foundation can be used for the loose zone). From the layout position, it is generally fixed on the fixed side of the stope to reduce the relocation frequency as much as possible, It is particularly important to improve the service life, especially for rock crushing and transportation.
When the semi fixed crushing station is moved, only the equipment body bolted to the foundation can be disassembled, moved and reused, and the foundation buried below the surface will be discarded.
Because the semi fixed crushing station has a solid foundation, it can be large-scale in type selection. It is suitable for mines with large processing capacity and long service cycle.
To build a fixed foundation, the construction cycle is long, the relocation work quantity is large, the relocation operation time is long, and the civil engineering cost is high.
Fixed crushing station
The fixed crushing station is usually arranged outside the stope boundary or inside the stope in combination with the chute. It is not affected by the advancement and extension of stope steps. It is connected with the ground with a permanent fixed foundation. It will be used permanently after completion and will not be moved. The feeding methods are diverse, which can be directly unloaded by truck, or a buffer silo can be set to be fed by the ore drawing device. The fixed crushing station is generally in the crushing workshop of the concentrator, which has the same service life as the mine.
Its biggest disadvantage is that the ore transportation distance is long, the transportation cost is large, and it is not suitable for reasonable adjustment.
- Comprehensive analysis
(1) The mobile crushing station is self driven in terms of its own walking capacity, and the typical walking modes are tire type, crawler type and walking type. From the layout position, it is generally located in the stope working face and should move flexibly with the advance of the mining working face.
(2) The semi mobile crushing station does not have the walking function, so it needs to be moved as a whole or separately with the help of special moving tools, and does not need to be connected with the ground. Sled crushing stations are also included in this category. From the layout position, it shall be arranged on the working side or non working side. As the steps fall, the vehicle transportation distance increases, and it shall be moved to the appropriate position below.
(3) There is an obvious connection between the semi fixed crushing station and the ground. The crusher needs to be installed on an effective concrete foundation or steel structure. In the layout position, it should be placed on the fixed side. Of course, there are some examples. Due to the limited topographic and geological conditions, it is necessary to build a solid foundation on the working side to place the crusher, which is also included in the semi fixed crushing station.
(4) The fixed crushing station is the most undisputed in classification and has a solid foundation. It is used outside the stope for a long time. The transportation distance is relatively solid and should not be adjusted.