(3) Medium and small overlapping double-column configuration, as shown in the following figure. The number of medium and fine crushing equipment is 1 to 1, because the number of medium crushing machines is large, the distribution mine bin is set evenly above the medium crushing machine for the ore feeding, and then the combined feeding of the mining machine and the belt feeder is given to the mine. Broken in the middle, below it is a fine crusher. The medium-breaking ore discharge is transferred to the fine crusher by gravity through the electric vibrating feeder and vibrating screen, and the sieved product and the fine crushed ore are transported by the shared collecting belt conveyor to the main plant grinding bin. Where the medium and fine crushing configuration, the location of the crusher is based on the tall reinforced concrete foundation, the characteristics are the same as the single-column overlapping configuration.
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2. The coarse, medium and fine crushers are arranged in a stepped manner . Each of the coarse, medium and fine crushers is one, which are respectively arranged in separate steps along the steep slope line adjacent to the stepped arrangement. The coarse crushing unit sets the original mine bin, and its upper edge elevation takes into account the convenience of ore mining and transportation. Before the medium and fine crushing, there are pre-screening, no need to set up a mine bin; the height difference between the coarse, medium and fine crushing units is large. The length of the tape conveyor for the upper job feeding is shorter; the working environment is better than the overlapping configuration, but one more crane. When the local shape slope is only about 12%, the coarse, medium and fine crushing equipment units can be arranged in the same factory along the flat terraces. The coarse crushing step has the highest elevation, the middle broken is the second, and the fine broken step has the lowest elevation. The length of the belt conveyor feeding the unit to the lower unit and the length of the workshop are slightly longer than the adjacent ladder configuration scheme, but it is easy to contact and manage, and there are few cranes.
Five, three sections of a closed circuit crushing plant is provided three sections arranged in a closed circuit crushing process large and medium beneficiation plants the most widely used, which depend on the hardware configuration of the plant the same number of sets of working equipment, equipment dimensions, equipment unit is a combined crushing and screening Whether it is separate, whether it is completely separated or partially separated, whether there is a mine bin and screening operation, a single column configuration or a double column configuration. Common plant equipment configurations are:
(1) The coarse, medium and fine crushing equipment are arranged in a straight line in the same factory building, and the closed screen sieves are separated into independent workshops, as shown in the following figure. The medium-sized ore dressing plant can adopt this scheme, because the number of each working equipment is one, there is no material distribution problem, the unit height can be reduced, and the coarse, medium and fine crushing can be easily arranged in the same plant. The coarse crusher unit is arranged on the steep slope topography, and the original mine silo is located at the highest point. The determination of the upper edge elevation must take into account the convenience of the original ore transportation and the dumping and unloading. There is no pre-screening before medium or fine crushing. The medium and fine crushing units are arranged close to the same terrace, and the elevation is lower than the coarsely divided terrace to facilitate shortening the conveying distance of the coarse to medium crushed materials. The closed-circuit sieve pulls out the crushing plant and the independent screening workshop is arranged in a straight line with the broken mine. The medium-fine crushing ore discharge is transported by the common collecting belt conveyor 6 to the screening plant, and the material on the screen is returned to the fine crushing by the belt conveyor 8, and the material under the screen is transported to the main building grinding bin through the belt conveyor 9. According to the terrain and other conditions, the screening plant and the crushing plant may not be arranged in a straight line. The direction of the screening conveyor belt conveyor and the direction of the crushing ore collecting ore belt conveyor (transferred after extending the plant) can be 90°. The material on the sieve is returned to the fine crush by a belt conveyor.
(2) The coarse crushing is an independent workshop, and the medium-fine crushed and closed-circuit sieves are arranged in the same factory. This scheme is a common medium-fine crushing configuration scheme for large and medium-sized mineral processing plants. In this scheme, there is no pre-screening before crushing, coarse crushing ore discharge is directly fed into the medium crushing by the belt conveyor; when the large-scale concentrating plant has a large number of crushing and screening equipment, it can adopt double-column configuration, basically this single-column configuration The parallel combination is equivalent to two independent systems. Due to the large number of equipment, the distribution bins are arranged above the medium and fine crushing units, and are arranged above the middle of the parallel two-row crushing unit, and the unloading trolley fabric is moved by the belt conveyor. For the convenience of configuration, management contact, construction, etc., the pre-screening is set in the medium crushing, and the positioning elevation and the upper edge of the distribution bin are consistent with the fine crushing. The medium and fine crushing ore discharges are returned to the distribution bins of the respective closed-circuit sieves by the respective collecting belt conveyors, and the feeders are fed into the closed-circuit sieves, and the sieved materials are introduced into the fine crushed materials, and the sieved materials are passed through the respective system's belt conveyors. Go to the main plant grinding bin. The same line segment belt conveyor runs of the two systems are arranged in parallel. [next]
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(3) The coarsely divided, medium and finely divided, closed-circuit sieves are each an independent workshop. As shown in the figure below, the medium and fine crushed in the same plant, 2 medium crushing cone crushers 4, 4 sets of fine cone crusher 5. Before the crushing, the distribution bins are fed to the medium crusher through the ore feeders 2 and 3. The four crushers and the two medium crushers are arranged in a single row, and the crusher is discharged through the collecting belt conveyor 6 . 8 belt conveyor to independent closed-circuit screening plant distribution mine bin 9, by moving unloading trolley fabric, feeding through the roller feeder 10 to the vibrating screen 11, the sieve material is returned to the belt conveyor 13, 14 The finely divided material is transported by the belt conveyor 12 to the main building. 1 is the feed rubber conveyor, and 15 is the broken mine cross-bridge crane.
The closed-circuit screening plant can also be arranged in a straight line with the medium-sized crushing plant, and the two plants are separated by a distance. A distribution bin is required above the fine crusher, which is on the same side and the same elevation as the medium crushing bin. The material on the sieve is returned to the fine crushing bin by the belt conveyor (by the unloading trolley fabric), and the medium and fine crushing ore is sent from the collecting belt conveyor to the screening distribution bin (by the unloading trolley fabric), often returning to the belt conveyor Covered by a corridor. Program choices need to be compared. [next]
(4) The coarsely divided, mediumly crushed, finely divided, closed circuit screens are all separated into separate workshops. When a large-scale concentrating plant has a large number of medium-crushing, fine-crushing and screening equipment, this scheme can be adopted in order to improve the working environment of the production operation, and the belt conveyor is used for the materials in the workshop. The medium-crushing, fine-crushing and closed-circuit screening units are all equipped with distribution bins. The tapes are used to move the unloading trolley fabrics. The equipment is arranged in a single row. The belt conveyors outside the plant are covered by a corridor.
Six, coarse crushing plant equipment configuration
The coarse crushing is an independent workshop. Generally, it is a large and medium-sized concentrating plant. Because of the large size, high body and heavy weight of the gyratory crusher or jaw crusher , the supply of the ore is large and the vibration force is large. Pay attention to the following basic issues when configuring coarse equipment:
(1) The steep terrain should be fully utilized. The ore mine should be adapted to the upper edge of the mine bin and the ore surface (or pavement) elevation, which is conducive to the transportation and unloading of the original ore and reduce the project cost.
(2) The gyratory crusher of more than 900mm can be dumped by the whole car. The filling of the ore is commonly used by domestic and foreign concentrators. Due to the large amount of dust generated by the filling of the mine, the factory is mostly open.
(3) In order to reduce the large ore collision collision gyratory crusher, the ore mine should be appropriately widened by the mine, and the “ore ore dead angle†formed by the use should be used for buffering. Some foreign countries have set up sub-mineral beams in the mine bins for buffering. The length of the ore mine should be considered in the inertial displacement size of the mine car when parking (excluding car supply ore), and the gravity gradient of the nugget falling into the coarse crusher should be sufficient.
(4) Generally, the pre-screening is not used. Only when the ore is relatively fragmented, the fine fraction is large or wet, the fixed strip screen (and the feed stream is bad) is considered, which will increase the unit height and maintenance cost.
(5) Jaw crusher and less than 900mm gyratory crusher should be considered to set up the mine bin, and feed the mine to the coarse crusher through the plate type feeder; when the nugget is less than 300mm, it can be based on mining, raw ore transportation and coarse crushing work system. It is appropriate to construct a certain volume of raw ore bins.
(6) The mine discharge site of the gyratory crusher filled with ore should be equipped with a buffer mine, which can be transported by belt-type mining machine to the belt conveyor or directly to the spring with buffering effect. The rubber ring idler (encrypted arrangement) is transported out on the belt conveyor. The ore powder leaking from the plate feeder shall be transported out through the funnel and belt conveyor to prevent leakage on the ground or floor. The coarse crusher equipped with the mining bin and the feeding machine can be arranged without the buffer silo and the feeding machine, and can be directly discharged to the belt conveyor by the funnel.
(7) Depending on the specific situation, the top of the mine bin above the gyratory crusher can be installed to remove large blocks of effective equipment and facilities. Since the 1970s the use of foreign hydraulic breaker to be too large piece of broken, our iron ore concentrator uses Nanfen wind breaker.
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