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เกจวัดแรงดันเชื้อเพลิง pumping stays one of the most advanced engineering challenges in mineral processing. Here, Weir Minerals presents recommendation for coping with the vital thing challenges on this operation, tips on how to maximise pump availability and minimise upkeep in operators’ flotation circuits.
To counteract declining ore grades, increasingly mine operators are investing in methods to increase the minerals reclaimed from froth pumping. However, when these strategies are deployed without making allowances for the design of the mine’s froth pumping equipment, it may find yourself in the loss of valuable minerals and profits.
Froth pumping stays one of the complicated engineering challenges in mineral processing. This is essentially as a end result of the fact that air administration points in the hopper, sump and pump itself can sometimes lead to inefficient pumping, increased maintenance and even lost product.
“We’ve began to notice a sample amongst our clients who are having hassle with their froth pumps,” said Les Harvey, regional product manager for Slurry Pumps at Weir Minerals. “By using more flocculants and other chemical substances designed to improve mineral restoration, they’re exacerbating present problems in circuit design and lowering the returns they’re on the lookout for.”
Close examination of the froth’s make-up and bodily qualities is often needed to resolve issues. Ensuring operators’ froth dealing with gear adheres to finest design practices is a crucial first step in resolving problems.
Maintaining strain The key challenge in froth pumping is dealing with air in the pump itself, as it tends to naturally centrifuge into the impeller’s eye, where it builds up into an “air lock” which impedes the motion of slurry via the pump.
In addition to decreasing the pump’s efficiency, the air build-up in the pump will scale back its move and improve the slurry degree within the suction hopper. The increased slurry degree could push the pocket of air by way of the pump, inflicting surging and excessive vibration which might injury the pump bearings, impeller and shaft. “The finest approach to handle air in a froth pump is to invest in a froth pump with a continuous air elimination system (CARS), which we’ve in our Warman AHF, MF and LF pumps,” says Harvey.
This system allows air to maneuver from the pump’s impeller eye to an air collection chamber within the back via a vent hole in the impeller. From the chamber, a circulate inducer removes the air from the pump through a vent pipe. “It’s additionally important to place the pump’s discharge pipe at the high of the pump, or at a 45° angle as this will give air trapped on the high of the casing a way to escape the pump.”
Solving เกจแรงดันลม “A persistent problem we see is when hoppers designed to satisfy the demands of slurry pumping are utilized in a froth pumping utility. Slurry hoppers require turbulence to stop the mineral content material from settling, whereas turbulence in a froth pump prevents the air from escaping and results in blockages,” mentioned Harvey.
Tanks designed for froth pumping promote continuous circular motion, the place solids and liquids are despatched to the skin of the sump for further transport while air centrifuges into the centre the place it can be eliminated. This ‘whirlpool’ movement can be inspired by introducing the slurry from the highest of the tank at a tangential angle. Conical designs, rather than these with a flat or rounded floor, further enhance the move of minerals and froth into the pump.
Smooth crusing To stop blockages, the intake pipe which hyperlinks the tank to the pump should have a large diameter and slope downwards towards the pump. This design allows escaped air to separate and journey again up the pipe the place it may possibly escape from the sump, somewhat than increase into blockages.
“The shorter your consumption pipe, the tougher it is for blockages to construct up. However, along with a upkeep spool and isolation valve, it’s a good idea to depart sufficient space for a water injection port, which is helpful for flushing out any solids construct up,” mentioned Harvey.
“To make maintenance simpler, a dump valve could be included on the suction aspect of the pump, between the pump and the isolation valve. This will enable users to drain slurry from the pump and the discharge pipe system when stopping the pump for upkeep.”
Tenacious froths Froths are often classified as either brittle, with massive air bubbles that break simply, or tenacious, where air forms tight bubbles round minerals and is tough to separate. Froth being more tenacious than was accounted for is a frequent explanation for blockages as air cannot successfully be eliminated.
“Two issues are occurring in the market right now. On one hand, mine operators are grinding the product a lot finer than earlier than to liberate more from the waste rock. They’re additionally utilizing flocculants that produce much smaller bubbles which lock up the air much more than brittle froths,” said Harvey. “We’re working along with clients to search out methods to handle these more tenacious froths, by looking at their circuit design and dealing with areas where the air may accumulate and block the system, paying specific attention to their pumps, pipes and sumps.
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