For gold mine, if the process of beneficiation of mineral and gangue separation process, then the first step is to separate grinding, grinding production process they use closed-circuit grinding, that grinding equipment must cooperate Grading equipment to complete the work, usually we refer to all the grinding before a certain mineral processing operation as a grinding operation, which means that one grinding may be completed by a group of (parallel) grinding equipment, or a series of grinding The device is complete, and a group of devices we call a segment. Sometimes we will increase the grinding process as needed during the beneficiation process. At that time, we called it two (multi) times of grinding, which is what we often call re-grinding.
The choice of grinding process depends entirely on the nature of the ore, and the state of gold is particularly critical. This is why we start from the geological classification of gold mines. We said that the common gold mines can be roughly divided into four types. Then we will talk about their grinding processes for these four types of mines. .
Quartz vein type gold mine
Occurs in a large number of gold minerals and gangue between pyrite (other sulphide minerals), is performed up close we often Ming gold amalgamation early adopters, grinding the product so that the overflow is formed by a metal plate Hg Mercury paste, and the mercury plate can be supplemented by this part of the crack gold. Due to the limited time of the slurry passing through the mercury plate, we hope that the number of passes can be increased, and the stress between the cracks is much smaller than the lattice force. It is not necessary to achieve pulverization through a large amount of milling. Therefore, for this mineral, we are suitable to use a short barrel mill, a large number of returns, multiple peeling, and continuous opening of the crack to create conditions for the filling of the mercury plate. Of course, since the mercury plate has been banned, it is replaced by re-election. The same grinding method is also effective for the recovery of free (bright) gold by gravity (centrifugal force). However, such grinding products (-0.074mm accounted for 35-50%) have a certain pressure into the flotation operation, so it is better to choose the second-stage grinding for fine grinding. Under normal circumstances, the final grinding fineness reaches -0.074mm. - 68% is more suitable for this type of gold mine. If it is not considered to increase the re-election process, it is reasonable to grind a section to a qualified fraction.
Broken belt altered gold deposit fractured altered gold deposit
Born in total gold minerals sulfide mineral, fine disseminated form, and gold sulfide ore can not be separated, and therefore this type of sorting is entirely gold sulfide ore selected from, but gangue quartz and sericite based, and hardness The difference between the grindability and the grindability is large. In order to make the grinding more selective and avoid the muddyness caused by over-grinding, the ore is more suitable for the second-stage grinding. If the scale is smaller, the grinding can be used for two stages. In order to make the spare parts relatively consistent, the general two-stage grinding will use the same size lattice grinding and overflow grinding. Usually this type of deposit, grinding fineness of -0.074mm accounted for 65-70% will have better beneficiation indicators.
Fine veind gold deposit
Gold minerals are distributed in sulfide minerals, and the types of sulfide minerals are complex. There are several or even dozens of common minerals. However, the main gold-bearing minerals are arsenopyrite and pyrite, which are extremely fine-grained. It is difficult for minerals to obtain good beneficiation index in rough grinding state. It is usually suitable for two-stage grinding to -0.074mm, accounting for 80-85%. At the same time, because the sulfide minerals are similar in floatability and tight in continuous life, it is difficult to grind once. Obtaining a higher grade, if the coarse concentrate is re-ground before the selection, and selectively suppressing part of the sulfide ore, it will greatly help the upgrading of the concentrate grade.
Quartz- calcite type gold deposit
The more complicated part of this deposit than the fine vein impregnation type is that gold minerals are not only distributed in sulfide minerals, but also heavily infiltrated between gangues. The gold-bearing minerals are more complicated, except for one-stage multi-stage grinding to -0.074mm. More than 85% of the flotation is outside the flotation. There are still a large number of gold and gangue connected to the flotation, which is suppressed in the selection. This part of the product is repeatedly circulated in the flotation if it is not dissociated by secondary grinding. Between the operations, the amount of return is accumulated, which may cause undesirable problems such as sinking of the flotation machine.
Of course, every grinding operation has a grading equipment that is compatible with it. How to use the grading equipment to complete the grinding operation is also very important. After a preliminary understanding of the grinding process of common gold deposit types, about grading and grinding How to cooperate with the mine to better separate gold and gangue minerals, and equipment selection for grinding and grading, please pay attention to the next week's "Minshi Qi Tan - Selection (Series 4:)"! We will not see !
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