Dry tailings discharge is a tailings disposal process. The dry tailings plant dewaters the tailings through multiple stages to form tailings with a small water content, which are stacked in the tailing pond in the form of dry slag, reducing environmental pollution In addition to land occupation, the tailings after dry discharge can be used for secondary use, such as filling goafs, processing them into building materials and fertilizers, etc.
Common Tailings Dry Discharge Equipments in Dry Tailings Plant
- Combination of thickener and ceramic filter
This group of equipment is mainly suitable for the dehydration and dry discharge of medium and fine-grained tailings particles. It is difficult to dehydrate coarse-grained tailings. Moreover, the production cost of this group of processes is relatively high. The filter plate of the ceramic filter is extremely prone to blockage, and Difficult to clean up. It can be said that this group of equipment has greater limitations, but its dehydration efficiency is higher, and the dehydration component can be as low as 10%. Suitable for medium and large enterprises to invest in dry tailings plants.
- Combination of thickener and chamber filter press
After the tailings slurry produced by the beneficiation plant is concentrated on a high-efficiency thickener, the slurry is pumped to the filter press workshop to be stirred and filtered. After being fully squeezed, a flaky tailing cake is formed. The tailings filter cake is transported by a belt conveyor and stored in layers in the dry tailings yard.
The pressure-filtered water enters the sedimentation tank, and the clear water from the upper part of the sedimentation tank overflows into the clear tank. The clean water in the clean water tank is pressurized by a water pump and used for the production of the concentrator. The fine-grained tail mortar liquid from the bottom flow of the sedimentation tank is pressurized and sent to the mixing tank by the submersible mud pump, and then enters the filter press process. After the process is processed, dry tailings discharge is realized, no tailings slurry is discharged, and all the backwater can be used.
This group of equipment is also only used for the dewatering of medium and fine-grained tailings. The moisture content can be as low as 15-20%. However, the loss and cost of the filter press are relatively high, and the service life can only be maintained for 1-3 months. Ore discharge is not continuous, and some processes require buffer equipment. But the important thing is that this group of equipment has a large production capacity, and large-scale mining enterprises often use this technology.
- Combination of thickener, cyclone and belt filter
This group of processes applies the cyclone to the dry tailings process, which is only suitable for medium and coarse-grained tailings, and the product dehydration can be as low as 15%-18%. However, this group of equipment has been put into production and cost is high, and the power consumption of production and operation is high, and the cost of dry discharge is even higher than the cost of beneficiation.
- Combination of hydrocyclone, high-efficiency deep cone thickener and high-efficiency multi-frequency dewatering screen
Use the slurry pump to send the slurry containing -0.074mm particle size within 65% to the hydrocyclone unit for preliminary concentration and dewatering. The fine-grained underflow enters the high-frequency tailings dry sieve, and the coarse-grained overflow enters the high efficiency The deep cone thickener performs secondary dehydration, and the underflow of the thickener continues to be dehydrated by the tailings dry sieve. Recently, the material on the screen with a moisture content of less than 15% was obtained.
If the sludge content of the tailings is too large, a small filter press can be introduced.
- Combination of multi-stage variable cone cyclone, dewatering screen and high efficiency thickener without rake
The process is similar to the previous one, but the specific equipment is slightly different. The multi-stage variable cone structure of the high-efficiency cyclone improves the classification efficiency, and the separation particle size can be reduced by 20% to 30% compared with the conventional cyclone, which lays the foundation for the efficient operation of the dry discharge process. Through the introduction of the rake-free high-efficiency thickener, the problem of high-efficiency dewatering of fine-grained and fine-grained tailings is fundamentally solved, and the efficient operation of the dry drainage process is guaranteed.