Flotation separation process is a complex ore beneficiation process.During the operation of flotation plant, the operation of flotation cell has an important influence on the flotation effect.The wrong operation will directly affect the index of the flotation product, so it is crucial to operate and adjust scientifically the flotation cell.The operating factors of the flotation machine mainly include the amount of inflation, the circulation hole area size, the mixing mechanism clearance, the scraping bubble amount and the liquid level and so on. From the following, you will learn about the influence of the above flotation operation factors on the flotation effect .
Use the table of contents below to navigate through the guide:
01Flotation cell inflation volume adjustment
Due to the particularity of flotation method, the inflation amount of flotation machine is very critical in the flotation process.Appropriate inflation amount is the premise of a good flotation index.Excessive inflated inflation can the selectivity for useful minerals.When the amount of inflation exceeds the limit, the flotation bubbles will even merge to form the air flow, resulting in the liquid surface flipping.At this time, the stable foam layer will not be formed in the flotation machine, losing the useful minerals in the tailings.
Generally, when the pulp concentration given into the flotation cell is high and the useful mineral float is good, the inflation amount can be appropriately increased, to ensure that the flotation machine has a higher treatment amount.When the concentrate index requirement is strict, the mineral floatability is poor or the flotation slurry concentration is low, the inflation amount can be properly reduced.According to the sequence position of the different flotation rooms, the inflation amount of each flotation chamber is also different.It should be ensured that each flotation cell can form a stable froth layer.
02Flotation circulation hole area
A certain area of circulation holes are set on the stator or sleeve of the mechanical agitation flotation cell. The size of the circulation hole has an important influence on the pulp circulation volume, and also has a certain influence on the aeration performance and production index of the flotation machine. If the circulation volume of the flotation cell is too large, it will cause the liquid level to turn over and increase the power consumption and impeller wear. The effect of the circulation hole area of the sleeve circulation hole on the flotation machine is complicated. The aeration volume of some types of flotation machines will decrease after the slurry circulation hole area increases to a certain area, but the power consumption will still increase.
In actual production, the area of the circulation hole should be adjusted according to the quality, processing capacity and type of the flotation product to form an appropriate circulation amount. At the same time, it is also necessary to regularly dispose of the sundries on the circulation holes to avoid clogging of the circulation holes.
03Flotation cell agitation mechanism gap
The radial and axial clearances between the impeller and the stator of the mechanical agitation flotation cell have a significant impact on the performance of the machine. Both of them will lead to a decrease in the aeration volume, slurry absorption and aeration uniformity coefficient of the flotation machine, and increase the machine power consumption.
Generally, the radial gap of the agitation mechanism of the flotation cell does not exceed 8mm, and the axial gap does not exceed 10mm. You can use a metal or plastic feeler gauge to detect the gap size when the flotation cell machine is discharged for maintenance. When testing, multiple points should be measured along the circumference of the impeller and the average value should be taken.
04Flotation cell scraping bubbles and liquid level adjustment
Scraping foam is an important process of flotation cell. It is related to the level of the flotation liquid and has an important impact on the quality and recovery of the flotation concentrate. If the foam layer cannot be scraped out of the flotation machine in time, it will cause the foam layer to accumulate. Useful minerals are lost in tailings. It not only affects the recovery rate of concentrate, but also affects the processing capacity of the flotation machine. Conversely, if the foam is scraped out with a part of the pulp, the concentrate quality will be reduced. Therefore, it is very important to adjust the flotation liquid level. It should be noted that when the flotation liquid level is raised, the amount of scraping foam increases and the foam layer becomes thinner. Judgments should be made according to the structure of the flotation machine, process links, etc., and adjustments should be made in time.
The above is the influence of the flotation cell operation on the flotation effect. In actual production, the operation requirements of the flotation cell are also different according to the different process stages. It should be comprehensively considered according to the actual situation and the process production conditions, and the flotation machine should be operated scientifically and reasonably to ensure the long-term stability of process indicators and economic benefits. The flotation cells produced by Xinhai are of good quality and high efficiency, and welcome to consult.