For the very different conveying tasks in mining the KLEIN GmbH, Jettingen-Scheppach/Germany, has developed individual solutions. The machine concept is based mainly on the composition of the media to be transported (fluidity, consistency, particle size and particle composition), their wear behavior and the required pressure needed, amongst others, depending on the expected flow rates and pumping distances. Typical applications of the KLEIN mining pumps are e.g. (Figure 1):
- backfilling of expended mine galleries and cavities with fly ash or FGD gypsum from desulphurization of coal power plants or to convey contaminated soil to underground (1). In addition to the pump system KLEIN supplies to the respective conditions adapted, continuous mixers;
- wet spraying of concrete with mobile shotcrete systems for stabilising mining galleries and pumping concrete with stationary or mobile concrete piston pumps, even over long distances (2+3);
- pumping sandy mine water from low-lying pit swamps to above ground (4);
- conveying ore as well as tailings during ore processing, for example, in bauxite mining (5+6).
KLEIN 2-cylinder piston pumps are now used not only for concrete delivery. For pumping of incurred soil during tunneling, the KLEIN GmbH presents the S-tube valve-controlled dual piston pump KIP 9015. Customer of the exhibited machine is a Japanese client who will use the machine with 160 kW drive power to pump tunnel overburden to the surface. The pump system is designed for flow rates up to 150 m3/h at 28 bar resp. 75 m3/h at 50 bar.
To highly accurate volume and pressure dosed injection of mortar behind tubbing, KLEIN GmbH introduces seat valve controlled injection pumps. The advantage of this design: When changing from pressure stroke on to the suction stroke any back flow of pumped mortar is prevented by closing the valves. So it can not lead to incorrect measurements while switching of the feed pistons. At the Munich trade fair bauma KLEIN showed the seat valve pump KIP-V 12 in different versions (Figure 2).
Beside of different jobs in mining in many other sectors of industry KLEIN high-density solids pumps have to withdraw dewatered sludges, toxic pastes, industrial waste, smelling biomasses etc. through closed pipelines from tanks and pumped into silos or incinerators. To convey these media KLEIN has developed the universal piston pumps of type KIP 42. A typical application for this pump is the energy-intensive cement production. To reduce the need for expensive primary energy, the cement industry is increasingly using high caloric secondary fuels such as oil sludge, shredded used tires, filter cakes, fractions of industrial and commercial waste and synthetic fuels. The metered pumping of substitute fuels in the rotary kilns KLEIN Universal pumps assume.
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