First of all, we believe that the particle size of the crushed product has a great influence on the processing capacity of the grinding. When we calculate the processing capacity of the mill, there is a crushing particle size corresponding to the value of -0.074mm. We try to sieve the broken product. The club found that this value is not accurate, so let us consider this value as the lifting value of the grinding capacity -0.074mm in different crushing granularities.
The finer the crushing product, the greater the ability of the mill to increase the -0.074mm grain size. Therefore, when the nature of the ore changes, we should strengthen the management of the crushing and screening system to ensure the grinding capacity.
Ore into the mill, is in contact with grinding media, gold ore, steel balls are almost exclusively used as grinding media, with the rotation, and the ball movement therewith mineral mill, the filling rate when the ball At certain times, the steel balls in the mill are in a state of both falling and falling. Of course, if the grinding speed is too fast, there may be a centrifugal motion state, but this is not a reasonable situation. When the steel ball is thrown, the effect on the mineral is mainly impact. When the steel ball is in the discharge state, the effect on the mineral is mainly grinding, and the crushing ability is stronger when impacting, especially for the larger particles. The minerals have a greater force, and the grinding tends to be evenly peeled off during grinding, which is more helpful for the grinding fineness (-0.074mm size).
When the ball mill is rotating, the small diameter ball is generally concentrated on the outside of the ball bin, while the large diameter ball is generally concentrated on the inside of the ball bin, that is, the ball is concentrated at the bottom from the static state, the big ball is concentrated in the upper part, and the small ball is Extrusion, it is difficult to form a throwing motion. A part of the ball of the medium and large model forms a drop with the rotation of the mill. This is why we often say "large ball milled coarse grain, small ball milled fine grain".
Of course, the shape and state of the mill liner are different for the lifting ability of the steel ball. The newly installed lining has sharp edges and corners, which can improve the steel ball, and the old lining is less capable. Therefore, in the case where the ore is coarser in grain size and the liner is used longer, the large ball should be added as appropriate to ensure the balance of the grinding grain size, and vice versa. Under the same steel ball ratio, the concentration of the slurry also has a great influence on the grinding. Generally speaking, when the concentration is high, the impact is greater, the grinding efficiency is higher, and the concentration is lower. It has a large dispersion of impact force and is not suitable for crushing coarse minerals. Therefore, for a section of grinding we need to maintain a high concentration, usually at 72-78%, the second stage grinding concentration is appropriately lowered, usually 55-60%.
Then, we say that the purpose of grinding is not to reduce the size of the minerals without limitation, but to separate the minerals that have been finished (the size required for the next step) in order to understand the minerals, or the exposed minerals. Is the job that the grading device needs to complete. The classifier is based on the principle of natural sedimentation, and we know that the longer the slurry settles, the higher the fineness of the overflow. The fineness of the overflow of the classifier can be adjusted by adjusting the position of the ore. The height of the flow gate is controlled, and the farther the mine is from the overflow, the higher the gate, the higher the fineness, and vice versa.
In addition, the lower the concentration, the faster the sedimentation of the slurry, so the amount of flushing water overflowed by the mill also has a great influence on the fineness of the graded overflow, but the overflow enthalpy is increased, and the flushing amount is increased, which will inevitably affect the return of the classifier. The concentration of sand and the proportion of sand returning affect the grinding concentration of the mill. Therefore, we must simultaneously control the mill to feed the ore to ensure the grinding efficiency.
Another commonly used grading device is a cyclone. The cyclone is a grading device that uses centrifugal force as a means. The cyclone itself is a non-powered device, so natural pressure (high feed) or pressure delivery is required. Complete the grading assignment. There are very few introductions about the cyclone. I have drawn two charts based on the collected data. The first one is the -0.074mm content corresponding to the graded particle size (D95 value), and the other is the recommended size of the graded particle size. Mine pressure, we can see that the different grading granularity produced by different ore pressures is different, that is, we can adjust the overflow fineness by adjusting the ore pressure, then the problem comes when we pass When the frequency converter adjusts the pressure, the flow rate must change. When the cyclone pressure is increased, we can supplement the new water according to the change of the pump liquid level. On the contrary, the overflow is thicker and the pressure is reduced. Next, we can replace the smaller sanding nozzle. In short, the steady working state of the cyclone is that the grit is columnar, and both the gasping and the umbrella are not ideal.
Grinding operation is the collision between the ball and the mineral. The loss of the ball directly affects the cost of the grinding operation. The loss of the ball is not only reflected in the wear, but also in the damage. Once the steel ball is damaged, the impact on the grinding is harmful. In the past few years, steel ball manufacturers have also been continuously researching, from low- chromium balls to high-chromium balls, and heat treatment methods to increase their wear resistance and collision resistance. From the 1980s, steel consumption is 1-1.5kg/ t to the present 0.5-0.8kg / t, it should be said that this type of research is still ongoing, and constantly break through, but we know that there is a big difference between the grindability of minerals and the grindability of gangue, that is to say When the gangue reaches the acceptable grain size, the mineral is likely to be over-grinded, thus affecting the effect of the later selection. Ningguo Dongfang Grinding Materials Co., Ltd. recently launched a "The Impact of Steel Ball Hardness on Selective Grinding" by well-known universities in the United Nations, hoping that they can achieve results as soon as possible and better serve mine production.
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