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In this post, we are talking about the impeller cover plate of the flotation cell.
We are going to introduce 4 types of impeller cover plate.
Cast iron impeller cover plate
Nylon impeller cover plate
Polyurethane flotation machine impeller cover plate
Rubber flotation machine impeller cover plate
Let's dive in！
The impeller cover plate of the flotation cell is the main part of the flotation cell, which is similar to the vacuum chamber negative pressure area of the pump.
Under the action of centrifugal force, the three-phase flow moves outwards continuously, which will cause serious impact and corrosion to the impeller cover plate of flotation cell. This is also a key factor affecting flotation performance. So, how to improve the flotation cell impeller cover plate corrosion resistance needs to consider its material.
The cast iron impeller cover is a common material for early flotation machines. It has high hardness and high wear resistance, but its brittleness is large, so it cannot withstand impact loads, and its corrosion resistance is poor. In the flotation process, due to the effects of material wear and corrosion of the flotation reagent, the cast iron material has a short service life and a high frequency of replacement. Generally replace the quarter plate of the impeller every time.
After using cast iron impeller cover plate for a period of time, due to serious abrasion, the gap between the impeller and cover plate will increase, resulting in insufficient filling capacity and stirring strength of the flotation machine, and finally the flotation machine slurry flow is not smooth, flotation liquid surface "over the flower" phenomenon.
Because the cast iron material impeller cover plate comprehensive utilization rate is poorer, already was eliminated gradually, use at nylon impeller cover plate, polyurethane impeller cover plate and rubber impeller cover plate more now.
The nylon material of the impeller cover of the flotation cell has the advantages of high mechanical strength, high hardness, high toughness, high hardness, good mechanical damping ability, good slip, good wear resistance, aging resistance, etc. It is the most important nylon float. The strong acid and alkaline materials of the impeller cover of the separator have good impedance. Using acid and alkaline mineral processing reagents, the nylon material flotation cell impeller cover is preferred.
Polyurethane is a kind of high-strength wear-resistant material. It has the high elasticity of rubber and the unique strength of plastic. Choosing the material of the flotation machine impeller cover can effectively prolong the service life of the flotation machine impeller cover. Compared with cast iron, the service life of polyurethane can be extended 5-6 times. Polyurethane oil resistance is very strong. And for the real flotation of molybdenum ore, kerosene is required for the flotation operation, and the impeller cover of the polyurethane flotation machine is more suitable.
The impeller cover plate of rubber material applies wear-resisting rubber material more. Wear-resistant rubber impeller cover plate mainly adopts the new "liquid nano formula • normal temperature and high frequency curing" glue manufacturing process, which has reached the advanced level in terms of abrasion resistance, resilience and tear resistance, with the wear-resistant index up to 128%, resilience up to 80%, tensile strength up to 23.5mp and tear strength up to 168N/mm.
Wear-resistant rubber impeller cover plate tear resistance, wear-resistant performance is strong, relatively weak for the treatment of strong corrosive materials, therefore, in addition to strong corrosive materials or agents outside the metal, non-metal ore can choose material flotation machine impeller cover plate.
In prictice, the choice of impeller cover plate of flotation cell need do mineral processing test to determine the final preparation process and the mineral processing reagents.
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