(1) The role and arrangement of the stockyard 1. The role of the stockyard
Ore beneficiation plant and mixing the yard has the following effects:
(1) Storage effect. Since the stockyard has a certain amount of ore storage, it is used as a storage facility to ensure that sufficient ore is provided to the concentrator. The material yard plays a role in regulating and buffering the contradiction caused by the concentrating plant and mining and transportation conditions. If the mutual interference of the work system is different, the factors such as the untimely transportation can be basically eliminated, which ensures that the concentrator can carry out continuous production under normal conditions.
(2) Mineralization and mixing. For the ore entering the stockyard, use the appropriate stocking method and cloth method, select the appropriate stocking and reclaiming equipment, make the ore mixed in chemical composition and physical properties, the quality of the selected ore is stabilized, the production operation and Management has improved.
2. Arrangement of the stockyard
The stockyard basically has two arrangements, one is a long stockyard and the other is a circular stockyard.
(1) Long material yard The long material yard has two main arrangements, one is parallel and side by side, and the other is tandem linear arrangement. In these two arrangements, there are generally more than two piles, one for the pile and one for the take-up. They are used alternately in the production process. The pile and the take-up are carried out simultaneously, and two will not occur. Kinds of work interact with each other.
The equipment used in the ore blending and mixing yards is mostly separated by stacking and reclaiming, instead of stacking and unifying equipment. The layout of the stockyard is mainly determined by factors such as the amount of material used, the site conditions, the layout of the general plan and the type of stacker and reclaimer selected. Parallel juxtaposition can be arranged in two-span two-stack and two-span four-pile. The series linear type is arranged in a span of two stacks. Each of these forms has its advantages and disadvantages.
The type of stocker and reclaimer used is closely related to the arrangement of the stockyard.
When the fixed cantilever belt stocker is used, since it can't be rotated, the stockyard is arranged in a span of two stacks. If the rotary cantilever belt stacker is used, the stockyard can be arranged in two spans and two stacks.
When the bridge type drum reclaimer or the bridge type double bucket wheel reclaimer is selected, the material yard can be arranged in two piles and two piles. If one reclaiming equipment is to take two piles of material piles, the reclaiming equipment cannot directly pass Cross or over-the-counter, when you want to cross the span, you have to use the method of crossing the car, as shown in Figure 1.
The bridge type reclaimer with two-way boring frame can change the direction of the bucket. The material yard can be arranged for two piles per span. The specific form has two stacks, two spans and four stacks. The reclaimer is set at Between the two piles, the material can be taken in two directions when taking the material. See Figure 2.
Figure 1 Bridge double bucket wheel (or drum) reclaimer stockyard layout
1 â€” Bridge double bucket wheel reclaiming; 2 â€” Rotary cantilever belt stacker; 3 â€” Cross-over trolley
Figure 2 Material layout of the double bucket wheel reclaimer with two-way boring
1 â€”Two-way è€™ double bucket wheel reclaimer; 2 â€” fixed county arm belt stacker;
3 â€”Rotary county arm belt stacker
When the swingable bridge type double bucket reclaimer is selected, since the bridge can pitch and slewing, it can directly cross the pile, so the stockyard can be arranged in a span of two stacks, two spans of two stacks or two spans of four stacks. , see Figure 3.
(2) Round material yard When the circular material yard is piled up, the ore is transported by a belt conveyor set on the trestle, and the ore is discharged to a radial rotary pile conveyor through the rotating funnel in the center of the yard for fabric. The stock belt conveyor should be pitchable to reduce dust pollution. The pick-up is usually carried out by a bridge-type plate reclaimer. The end of the bridge of the reclaimer is supported on the main column at the center of the yard, and the other end is supported on a circular orbit around the outer circumference of the pile. See Figure 4.
The outer diameter of the circular yard is between 45 and 100 meters, and the maximum is 150 meters, but it is 85 to 100 meters in use. This stockyard more suitable for small and medium sized plant, but less steel used in the enterprise. [next]
Figure 3 Schematic diagram of the material yard of the rotary bridge type double bucket wheel reclaimer
1â€”fixed cantilever belt stacker; 2â€”slewing bridge double bucket wheel reclaimer
Figure 4 Circular stockyard
1â€”Trolley and feeding belt conveyor; 2â€”Rotary stacking belt conveyor; 3â€”Rotating funnel;
4â€”scraper reclaimer; 5â€”discharge belt conveyor; 6â€”loop track
When stocking materials are piled up, they are generally divided into three piles on a circular material yard. Each pile is about 120Â° from the center of the circle. Therefore, a pile of fabric can be piled up, and a pile of materials can be taken and piled up for use. The material yard is characterized by high area utilization rate. The disadvantage is that there are transition zones that cross each other when the materials are piled up. The transition zone has an effect on the ore blending and mixing effect, and the material yard expansion is difficult.
For the above-mentioned long material yard and circular material yard, some are arranged indoors, and some are in the open air. At present, most of them are open-air, and they are placed indoors when there are special requirements, such as cold or rain due to climatic conditions, anti-freezing or rain-proof, or because the ore contains special harmful components, in order to reduce environmental pollution. The stockyard is set indoors and its investment is high.
(2) Stacking method and material feeding method
1. Stacking method The main stacking methods are as follows:
(1) Herringbone (or isosceles triangle) stocking method;
(2) Mitsubishi (or wavy) stacking method;
(3) Herringbone - Mitsubishi-shaped stacking method.
The above several stacking methods are shown in Figure 5.
Figure 5 Stacking method
The herringbone stacking method is a relatively simple one, and the effect is good for fine-grained ore or iron concentrate, and the granularity segregation is larger when used for lump ore. The Mitsubishi-type stacking method can solve the problem of particle size segregation to a certain extent, but requires the stacking equipment to rotate and pitch in addition to the longitudinal walking, and the structure and operation of the equipment are complicated. The herringbone-Mitsubishi-shaped stacking method is between the two.
2. Reclaiming method There are several types of reclaiming methods, such as end material reclaiming, side reclaiming and bottom reclaiming.
End face reclaiming refers to the beginning of the reclaimer operation from one end to the other along the longitudinal direction of the pile. Due to the different reclaiming equipment selected, some reclaiming can be carried out on the entire cross section of the pile, such as a drum reclaimer. In some cases, the material is only partially pushed laterally in the cross section, and then advanced in a longitudinal direction, such as a bridge bucket wheel reclaimer. End material reclaiming is more commonly used in stockyards.
The side reclaiming is that the reclaiming machine reciprocates along the longitudinal direction of the pile to pick up the material on the side of the pile. The mixing effect of the side reclaiming is not as good as that of the end part. Therefore, it can be used when the ore and mixing operations are not required.
The bottom material is an impeller type reclaimer that is mounted on the belt conveyor in the belt conveyor corridor at the bottom of the pile, and reciprocates along the longitudinally located mine hole of the pile, and the material is taken out and discharged to the belt conveyor. go.
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