Dry Tailings Plant

1. Environmental protection
   The use of tailings dry discharge and filling goaf technology solve the environmental pollution caused by traditional tailings discharge tailings.
2. The optimized footprint of tailings storage and minimized fresh water intake
   After the tailings are concentrated and dehydrated, dry discharge can not only save the construction cost and routine maintenance cost of the traditional tailings pond, but also make full use of the artesian backwater, and can greatly save the floor space and eliminate the tailings pond. security risks. In addition, in the process of mine production, it can eliminate the hidden safety hazards of goaves, save safety investment, reclaim the landscape restoration, save environmental treatment funds, be conducive to geological environmental protection, and realize replacement with waste.
   
3. New dry stack tailings management
   The equipment, technology, and process used in the tailings dry discharge process are innovative, which has opened up a new way for the comprehensive management of tailings stacking and goaf.
4. Less investment and great benefit
   After calculation, the use of tailings dry discharge and filling goaf technology will save investment in fixed assets, safety management funds, ecological environment management funds, energy conservation, and emission reduction and tailings pond maintenance costs.
5. Productivity increases and labor intensity decreases
   The production of tailings dry discharge equipment can greatly improve productivity and reduce labor intensity. According to reports, the heavy oil sludge is dewatered by using a fully automatic drawing box type plate and frame filter press. Without adding any dehydrating agent, the water content of the scum after dehydration is reduced from about 95.2% to 70%, and its oil content is about 70%. It accounts for 2% of the sludge weight, and the filter cake can be transported or landfilled.
6. Integrating sludge concentration and dehydration
   The dry stack tailings filtration system can deal with relatively viscous sludge without adding chemicals to obtain better results. The moisture content of the filter cake is related to the settling time. The clarified liquid and the soft plastic sediment are discharged separately from the skimming device. However, the processing capacity is small and intermittent operation is not suitable for processing a large amount of sludge. For the treatment of oily sludge, especially asphaltenes, paraffin, etc., They are easy to adhere to the skimming device and block.
7. High efficiency, energy-saving, and large processing capacity
   The dry tailings processing equipment has a rotary drum thickening belt press filter that integrates sludge concentration and belt pressing, overcomes the unfavorable factors such as low sludge concentration, and greatly improves the sludge treatment capacity, which is more efficient than the traditional belt press filter. It has the advantages of high efficiency, energy-saving, and large processing capacity.

Dry tailings processing according to the granularity

1. Coarse-grained dry tailings processing
   Slurry pump + hydrocyclone + dewatering screen + thickener
2. Medium and fine-grained dry tailings processing
   Slurry pump + hydrocyclone + dewatering screen + thickener + ceramic filter
3. Fine-grained dry tailings processing
   Slurry pump + hydrocyclone + dewatering screen + thickener + filter press
4. Ultrafine-grained dry tailings processing
   Slurry pump + thickener + filter press

Dry tailings processing equipment

• Thickener + cyclone + belt filter (belt filter can be regarded as a modification of cylinder filter)
  The process equipment combination system can be continuously produced and is suitable for medium and coarse-grained tailings, but the production and operation power consumption is high, the cost is high, and the investment is large. The moisture content of conventional products is 15% to 18%.
• Thickener + ceramic filter (ceramic filter can be regarded as a modification of disc filter)
  The process equipment combination system can be continuously produced, and is suitable for dewatering medium and fine-grained tailings and concentrates. The advantage is that the moisture content is low after dehydration, and the moisture content can be less than 10%. The disadvantage is that the equipment investment is high, and the ceramic filter plate is easy to block. Especially for the materials containing fine particles and quartz, the cleaning process is complicated and the requirements are strict. Due to the high equipment investment, this process equipment combination system is generally used for concentrate dewatering. 
• Thickener + box filter press or vertical filter press
  The process equipment combination system is suitable for medium and fine-grained materials, and can still be used when the pulp particle-0.037mm particle size accounts for 95%, and the product moisture is 15% to 25%. The wearing parts of the process equipment combination system mainly filter cloth and pump flow parts, the general life is 1 to 3 months and only 10 to 20 days in the case of improper use. The process equipment combination system discharges ore discontinuously, and buffer equipment may be required for some processes. The box-type filter press has been developed on a large scale, and the vertical filter press is expensive, but has a larger production capacity and lower moisture content, and is often used for concentrate dewatering.
• Cyclone + thickener + dewatering screen
  This combination is a new type of dehydration process and equipment (which can be called the third-generation dehydration process equipment). This combination is almost applicable to the dehydration requirements of all minerals within 80% of -325 mesh. This solution has low investment and low cost. The operating cost is 1/2 of that of ceramic filter, belt filter, and box filter press. The machine has almost no wearing parts, and the dewatering screen has a long service life. In addition, for very fine-grained minerals, a combined process can also be used: thickener + dewatering screen + filter press to complete the dehydration project.