According to the textbook, there are seven or eight kinds of crushing processes, but usually we consider the convenience of operation and arrangement. Generally, only two sections, one closed circuit and three sections and one closed circuit process are used. The choice is based on the amount of treatment, the hardness of the ore and the crushing ratio; the type of crushing equipment is also varied, but we usually use the most commonly used jaw crushers and cone crushers ; of course, from the structure, the driven system From the point of view of the control system, the jaw crusher and the cone crusher are subdivided into many different types. We will not elaborate on them. The equipment for the closed circuit with the crusher is the vibrating screen. The vibrating screen used in the crushing section is generally It is mainly based on a circular vibrating screen. As the first main equipment of the crushing section, the jaw crusher is connected to the feeding machine. In the early years, it was mainly a plate type feeding machine. In recent years, we have used vibration to the mining machine. Practice has proved that the vibration is given to the mine. The machine has low power consumption, strong transportation capacity, low failure rate and easy maintenance. It can fully meet the needs of gold plants of various scales. When choosing a jaw crusher, we will consider two factors. First, the maximum grain size, II It is the hardness of the ore. For the medium-soft ore, the material can be gradually broken up by feeding to the crusher. For the ore with higher hardness, the crushing should be completed in the middle of the seesaw, which requires the opening of the crusher to be larger. Some, and each type of crusher will give a limit to the ore size. In fact, this limit particle size is not the most stable working condition. For medium soft ore, we use extrusion feeding, even if there is a small amount of large ore beyond the limit. It also has no effect on the work of the crusher. On the contrary, if it is a high-hardness ore, it is best to use intermittent feedstock to avoid malfunctions such as jamming. Once the jaw crusher is stuck, the feeder and crusher should be shut down first, then the discharge gap should be increased, and the jog operation should be carried out. In most cases, this can solve the fault. In addition to the maximum ore size, an important parameter of the crusher is the discharge gap, but one thing to note is that the discharge gap is not equal to the maximum discharge size, and the maximum discharge size of the jaw crusher is usually the discharge. The gap is 1.5-1.8 times. The crusher of each model has the minimum value of the discharge clearance. Because of the limited position device, this minimum value cannot be exceeded. It should be noted that this minimum value is in the ore nature and the ore supply. Stable operation can be achieved under the most perfect conditions, and the processing capacity is greatly sacrificed. Therefore, in order to ensure the stability of the process, we will choose 1.5-2 times the minimum gap to complete the first stage of the fracture. The crude complete breaking, or sieving the ore directly or into the break in the thin broken, fine gyratory cone crusher, wherein the selection criteria cone crusher broken, thin broken selected short head cone crusher, cone crusher is iron It is fatal, so the ore must be done before the ore enters the cone. Usually we will add the iron remover to the upper part of the belt conveyor. In fact, it is a large magnet to pre-exclude the wire, nails, welding head and other debris. For the cone crusher, the squeeze feed must be used. The intermittent empty car operation is very harmful to the equipment. Therefore, the professional cone crusher manufacturer comes with a small buffer tank when the product leaves the factory. It can meet the operation of about 5 minutes, and the material from the fine crushing bin can be used to feed the ore into the buffer tank through the belt feeder or the small vibrating feeder. If we make the connecting chute, we can remove the buffer tank. Let the material accumulate directly in the chute. Similarly, the cone crusher will also give the maximum feed particle size parameter. This parameter is a mandatory parameter. Never try to overtake it. Once it is stuck due to excessive material, for the cone crusher, handle it. Very troublesome, first of all to completely empty the material of the buffer bin, and then increase the discharge gap to jog, of course, this usually does not work, then remove the feed port and slowly clean it... However, it needs to be explained Because of the closed-circuit crushing formed by the vibrating screen, the discharge gap of the cone crusher is not larger, and the processing capacity is larger. Different gaps determine different qualified product rates, which determines different return rates. Large, the actual processing capacity of the crusher increases, the gap is too small, and the speed of crushing is reduced, which is harmful in production, so we should find the best gap in the debugging to make the production smoother. As the vertebral body wears, the gap will increase, and we also need to observe the material changes at any time to make adjustments. In addition, the maximum discharge size of the cone crusher will reach 2-3 times of the discharge gap, so the gap size can be judged according to the size of the discharge when adjusting, instead of blind adjustment. Screening as the inspection work of the crushed product should also be regarded as the main equipment of the crushing section. Generally speaking, we choose single-layer sieve for small mines. We choose double-layer sieve for medium and large mines, but the purpose of double-layer sieve is not to grade three products. , but for screening efficiency is higher. Most of the sieve holes will choose long strips, the length is about 1.5-1.8 times the width. As for the material of the screen, it is also a benevolent person, depending on the user's usage habits, but it is certain that polyurethane (rubber) The screen has a longer service life, a lower screening efficiency, and a wire mesh that is more fragile, but has a higher screening efficiency and is easier to maintain. The screening equipment is a long-time high-speed operation, and its processing technology is the key guarantee for equipment stability. Due to the relatively harsh environment of the crushing operation, the state stipulates that the single shift time of the crushing section is not allowed to exceed 6 hours. Therefore, in the process of selecting the equipment, we generally verify the working hours of the equipment according to two shifts of 6 hours or three shifts. In addition, the construction period of the crushing system is long, the floor space is large, the room for reconstruction is small, and the proportion of equipment investment to total investment is low. For the plant with expansion plan, the crushing system will achieve the ultimate goal at one time. At the beginning of this century, the gold market has been rising all the time. Many gold companies like to use imported equipment in the process of expansion and reconstruction of the crushing system. However, as the price of gold gradually stabilizes, more and more enterprises are more willing to rational consumption, and domestic production is broken. There are many manufacturers of machines. The traditional production bases are Shanghai and Shenyang. The most technically representative of the domestic level is the crusher of Nanchang Mining Machinery. It combines the optimization of various foreign equipment technologies, but without losing its own design philosophy. Really achieved the coexistence of performance, quality and price. Although the screening equipment is simple in structure, the processing technology is complicated, and the welding and joining processes must reach a high level to ensure the quality. In addition to the old processing bases such as Anshan and Xinxiang, Tangshan Lukai, which has emerged in recent years, has reached its goal. International advanced level. When we saw the material of the size of the fingernail under the screen and entered the powder mine with the belt conveyor, we thought that the work in the crushing stage was completed. The product is used as the plasticizer for solid propellants and their cladding layers, and also as the cold-resistant plasticizer for other polymers. 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Broken gold mine
Each gram of gold from the rocks we see to us to wear jewelry, are essential to the experience of mining - crushing - grinding - sorting - smelting - processing procedures, from the perspective of dressing The first process is broken, and the crushing section is almost a necessary preparatory section for any gold plant. Its main purpose is to process large pieces of ore to our ideal particle size for grinding. In the early years, we did not have too many requirements for crushing, but in recent years, with the in-depth study of the consumption of crushed grinding, we also advocate more articles on the broken, which is what we often say. Broken and less grinding."