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Click to add WeChatIron ore is a mineral resource with a large output among metal minerals. The tailings stored after beneficiation also occupy a very large area and require a lot of manpower, material and financial resources to manage. In addition, some iron tailings contain harmful substances such as heavy metals and the dust caused by fine tailings particles will have a serious impact on groundwater resources and the surrounding environment. If the tailings are treated, the above problems can be effectively improved. At present, Xinhai Mining has developed a tailings dry discharge process, which is a way of tailings storage. Let’s learn about the advantages of iron ore tailings dry discharge, what is the process, and what equipment is used. ?
1. Iron ore tailings The mine has changed from dam-building discharge to earth dump discharge, and the tailings pond has been eliminated, thus avoiding accidents such as dam breach, dam overflow, and dam collapse, and improving safety.
2. Reduce the investment cost of the entire mineral processing plant, save land acquisition costs, and shorten the construction period.
3. Tailings discharge methods are diversified. It can not only create land and plant trees through cofferdams, but also backfill mine pits and subsidence areas, achieving a double harvest of resource development and environmental protection.
4. It is conducive to the re-selection of valuable metals (based on the composition of tailings) and the development of building materials, extending the enterprise's industrial chain.
5. Achieve zero discharge of waste water, save a lot of water resources for society, and save a lot of money for enterprises.
6. It is simple to manage, easy to operate, has a wide range of applications, and is suitable for concentrated dry discharge of tailings of various particle sizes and concentrations. Shandong Coal Machinery Equipment Group Co., Ltd. can carry out professional design according to user requirements and the size of the dressing plant, and provide related equipment of different specifications and models.
The tailings slurry obtained after selection is fed into the cyclone for concentration. The coarse-grained slurry flows out from the underflow and is directly fed into the vacuum filter for dehydration. ; The fine-grained slurry flows out through the overflow port of the cyclone and enters the concentrator together with the filtrate of the vacuum filter. After concentration, the bottom flow of the concentrator is dehydrated by high pressure using a chamber (vertical) filter press to form a filter cake; the overflow water of the concentrator The filtrate from the filter press enters the circulation pool and returns to the mineral processing system for recycling.
The main purpose of iron ore tailings dry discharge equipment is concentration and dehydration, so the main equipment used is cyclones, concentrators, and filters ( or filter press) and vibrating screens.
Cyclone is a kind of classification equipment with strong centrifugal force, which can be classified and dehydrated. In the tailings dry discharge operation, the slurry is discharged under a certain pressure (inlet pressure 15~20kg/m2) The ore is sent into the cyclone from the ore feeding port along the tangential direction of the cylinder, and obtains rotational motion, thus generating a large centrifugal force.
Under the action of centrifugal force, the coarser particles are thrown towards the wall of the vessel, move downward in a spiral trajectory, and are discharged from the grit nozzle. The finer particles and most of the water within the spiral trajectory are discharged from the overflow port to complete the tailings concentration operation, obtain a higher sand settling rate, and achieve a good dehydration effect.
In the tailings dry discharge operation, the concentrator is classified by the cyclone The sand is fed into the concentrator, where a certain amount of flocculant is added to make the mineral particles in the slurry form floccules, which can effectively accelerate sedimentation speed and improve concentration efficiency.
Iron tailings filter has two types: filter and filter press. The former uses filter cloth or filter mesh as the medium to achieve dehydration. . When the slurry is arranged horizontally on the filter medium, ultra-long filtration, powerful roller pressing and integrated dehydration are used, which is highly adaptable to coarse-grained tailings, and the filter cake moisture can be controlled within 20%; the latter is Positive pressure, high pressure and strong dehydration method has low filter cake moisture and low energy consumption.
In the dry discharge operation of iron ore tailings, the filtration equipment produces clear and transparent tailings filtrate, which can meet the requirements for direct discharge of environmentally friendly wastewater. The moisture content of the dry residue after filtration reaches less than 8%, which greatly reduces the transportation of tailings. Costs and risks of dry stacking of tailings.
The dewatering screen is installed in the iron ore dry discharge process using a unique structure And high-frequency vibration makes it difficult for the slurry particles to pass through the sieve, achieving effective separation of feed water, and finally obtaining dry pile tailings with a moisture content of less than 15%.
The above describes the dry discharge of iron tailings from three aspects: advantages, technology and equipment. In practical applications, the method of dry discharge of iron tailings needs to be determined according to the final required moisture content, because the purpose of iron tailings Different moisture content requirements are also different. If you want to know more tailings dry discharge process and equipment, you can consult Xinhai Mining to help you customize a suitable tailings dry discharge process and equipment. equipment.
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