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Dry Tailings Plant

Dry Tailings Plant

Release time:17 June 2022

The dry tailings plant is a new process of tailings disposal, which means that the tailings slurry output from the beneficiation process is concentrated in multiple stages, and then processed by high-efficiency dewatering equipment such as dewatering vibrating screens to form low water content, easy precipitation, solidification, and utilization. The slag stored at the site can be transported to a fixed location for dry storage. Dry stack tailings management offers significant benefits in terms of environmental sustainability, process water recovery, and footprint of the tailings storage facility.

It is the essential technology of green mine that reach the aim of tailings dry stacking and avoiding environmental pollution. JXSC Mine Machinery Factory supplies dry tailings management solutions for the dewatering and concentrating of mineral tailings in the mineral processing plants. It designs process tailings filtration plants and manufactures the equipment, maximizing your solution to tailings emissions.

Dry Tailings Management Solution →

Dry Tailings Plant

  • Relieve the pressure on the capacity of the tailings pond
  • Relieve the pressure on the capacity of the tailings pond
  • Increase the means of tailings reuse
  • Obtain a green environmental protection mine system

 

The tailing dry discharge system is also named the tailing water recycling system. It is to prepare the tailings after the valuable substances in the ore are extracted through the beneficiation process to be prepared into materials with a moisture content of 10% ± 2 and then transported to the tailings pond and a process for stockpiling or recycling it in a dump.

The main dry stacking tailings process methods are concentration equipment + dehydration equipment + conveying equipment. The whole dry stacking tailings system includes the slurry pump, hydrocyclone, dewatering screen, thickener, pressure filter, and belt conveyor. The selection and conveying method of process equipment are determined by the material properties, specific gravity, particle size distribution, processing capacity, and other index parameters of the tailings slurry, as well as the on-site geographical environment conditions.

 

  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.

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Dry Tailings Processing Equipment

Dewatering-screen
dredge pump, slurry pump, sand pump
Conveyor belt
Filter-Press
Hydrocylone
Vacuum-Disk-Filter
Thickner
Thickener

Process Tailings Filtration Plant Consultation

Dry Tailings Plant Solution

tailings dry stacking system

The specific flowsheet explanation is as follows

  1. Use the slurry pump to send tailing slurry to hydro-cyclone, its overflow go-to thickener, and its underflow go to dewatering screen. The concentration of underflow is about 60%–70%.
  2. Dewatering screen is the main dehydration equipment, it has the features of low inclination large-amplitude linear vibration, combined with the electromagnetic vibration net to clean the tailings on the screen, with the function of dehydration, tailings discharged from the over the screen, water from the under-screen into the tailings tank. So the underflow of cyclone goes to the dewatering screen and tailing is discharged from over screen, this tailing contains about 15%–20% water, which can be transported to the dry tailing stockpile by belt conveyor. The filtrate water under the screen is returned to the tailings pond.
  3. The overflow of the cyclone’s go-to thickener. Cyclone overflow water contains tailings of about 20% of the total tailings, tailings concentration of 3.5% ~ 5%, relatively fine particles, high viscosity, particle composition of -325 mesh 35% ~ 40%, 200 mesh about 45%, relatively difficult to treat.Generally, deep cone thickener is selected, and 3# agentia is added as coagulant and flocculant to improve the precipitation effect. Put the coagulant and flocculant into a dissolving bucket, and through the dosing pump send them to the thickener.
  4. The overflow water quality of thickener meets the requirements of beneficiation production, and all the overflow water is recycled and goes to a clean water pool.
  5. The underflow concentration of thickener is about 30%–40%, so it needs to go to a pressure filter for further processing. The filtrate water of the filter press is recycled to the clean water pool, and the filter cake (moisture content of 10% ~ 15%) is transported to the dry tailing stockpile by a belt conveyor.

Advantage
Using the above tailing dry discharge system, all tailings can be dry discharged, and the utilization rate of backwater can be increased to more than 95%. At the same time, the enterprise has zero discharge of sewage, there is no concern about environmental pollution of the tailings pond, and the economic and social benefits of the enterprise are huge.

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