Desliming principle of hydrocyclone
Writer： admin Time：2020-08-25 14:17 Browse：℃
Speaking of hydrocyclones, we usually think of grading operations. Hydrocyclones are a kind of grading equipment that everyone is more familiar with, but did you know? It can not only classify, but also perform operations such as concentration, dehydration, and desliming. In fact, the hydrocyclone has a wide range of uses. In addition to classification, it can also be used for concentration, dehydration, desliming and sorting. So what is the effect of hydrocyclones used for desliming operations?
Why do you want to get rid of mud?
Before the minerals enter the sorting process, they must first go through crushing and grinding. In the process of crushing and grinding, some minerals with very small particle size may be produced. We turn minerals with a particle size of 5-10μm into sludge. Most of them will seriously affect the subsequent sorting, affect the recovery rate of beneficiation, increase the consumption of beneficiation reagents, and increase the load of sorting equipment. Therefore, when necessary, we must add desliming operations before mineral sorting. The cyclone desliming is suitable for processing sludge below 19μm. If the grade of the sludge released is close to the tailings, it can be directly discarded. If the grade is close to the original ore, it can be separated separately.
The working principle of hydrocyclone desliming
We all know that the classification of hydrocyclones is based on the principle of centrifugal sedimentation, and the working principle of desliming is similar. Due to the difference in particle size and density of fine sludge and coarse sand, the centrifugal force they receive is also different. When the ore-bearing sludge enters the feed pipe by pressure or gravity and enters along the tangential direction, the centrifugal force on the coarse sand will be greater. Being thrown near the wall of the vessel, as the outer spiral flow is discharged from the sand settling port at the bottom, it becomes an underflow product with more solid particles; while the sludge has a smaller density, the centrifugal force received is correspondingly smaller, and the sedimentation speed is slow, so It takes a long time in the spiral flow and eventually becomes an overflow product.
Generally, the hydrocyclone is mainly used in heavy separation plants or chemical plants for desliming operations. In concentrators, the desliming hydrocyclone is suitable for processing sludge below 19μm.
According to incomplete statistics, 50% of the sludge before the final tailings output in the concentrator is discharged by the desliming hydrocyclone. After continuous experimentation and practice in recent years, the use of hydrocyclones to remove the sludge in the slurry is technically and economically feasible and reasonable. It has many advantages: firstly, it optimizes the beneficiation process The process improves the classification efficiency of desliming, protects the equipment in the subsequent beneficiation process to a certain extent, and improves the service life of the beneficiation equipment.
On the whole, the hydrocyclone is used for desliming operations, which improves the recovery rate of mineral processing, especially the recovery rate of sludge separation, reduces mineral processing costs, and increases economic benefits.
Advantages of hydrocyclone desliming
The optional equipment for desliming operations includes hydrocyclones, classifiers, thickeners, etc. After continuous experiments and practices in recent years, facts have proved that it is feasible and reasonable to use cyclones for desliming. Compared with other desliming equipment, hydrocyclone desliming has the following advantages:
1. High desliming efficiency
The hydrocyclone adopts an involute feeding method, which is beneficial to increase the centrifugal force of the material and improve the efficiency of desliming;
2, optimize the beneficiation process
Too much sludge will affect the subsequent separation process. Pre-desludge can optimize the beneficiation process and increase the beneficiation recovery rate;
3. It has a certain protective effect on subsequent mineral processing equipment
After the minerals are deslimed, they are sorted, which will protect the subsequent mineral processing equipment to a certain extent and extend the service life of the equipment;
4, save the cost of mineral processing
Too much sludge will increase the amount of beneficiation reagents used in the separation process, and will also increase the operating time of the equipment. Using hydrocyclone desilting can save reagents, water and electricity, and cost.
Hydrocyclone has become an important equipment to strengthen the treatment of fine mud, and it has shown great advantages in desilting or fine mud classification. The principle of hydrocyclone desliming is similar to its classification principle. It is divided into two types: pressure type and gravity type, and it is often made of cylindrical metal pipes. The ore-bearing mud slurry enters the ore pipe along the tangent line by pressure or gravity. The coarse particles are thrown near the wall due to the large centrifugal force, and are discharged from the grit port at the bottom with the external spiral flow, becoming sediment; fine particles Due to the low centrifugal force and the low settling speed, it stays in the inner spiral flow and is finally discharged through the overflow pipe to become overflow.
