GERMAN TECHNOLOGY
plant is scheduled to be completed in five setup stages by 2023.
On December 20, 2016, the first of these five setup phases of the new mass distributor was completed and delivered to Mibrag together with the A721 drive station for power operation. As a result, coal was successfully transported from the new Peres mining field of the Vereingtes Schleenhain opencast mine to the Lippendorf power station for the first time in December 2016.
FELUWA outlines MULTISAFE technology
The unique, patented MULTISAFE ® technology from FELUWA, with hermetically-sealed redundant double hose-diaphragms,“ ensures double safety for transportation of critical and environmentally hazardous fluids.”
Two hose-diaphragms, arranged one inside the other, are fixed in the pump head. These hose-diaphragms enclose the medium ensuring double separation of the hydraulic drive end.
Pressure: Flow rates: Driving power: up to 500 bar up to 1,000 m ³/ h up to 5,000 kW
The conveyed fluid is not in contact with the pump casing. Should one of the hosediaphragms leak, the second one ensures that pump operation can still be continued until the system allows for shutdown and repair.
A unique diagnostic system allows permanent condition monitoring of essential items such as check valves and hose-diaphragm. The innovative pump design is“ absolutely safe against excess-pressure, vacuum and unfavorable suction conditions.”
The rotary driving motion of the pump gearbox is converted into a reciprocating action of the crosshead by means of the crank drive. The crosshead is connected to the piston or plunger, respectively. By means of hydraulic fluid the piston actuates a pair of redundant hosediaphragms, which are arranged one inside the other. They not only enclose the conveyed fluid in a linear flow path, but also provide double hermetic sealing from the hydraulic drive end. The conveyed fluid will neither come in contact with the pump head nor with the hydraulic area.
For general process engineering applications, the hydraulic fluid normally consists of hydraulic oil. As an alternative option, non-compressible fluids with physiologically harmless lubricants are applied, which are compatible with the conveyed fluid. Pumping action is effected by displacement of the inside volume resulting from contraction of the hose-diaphragms.“ Unlike socalled peristaltic hose pumps with mechanical drive, the hose-diaphragms of the MULTISAFE ® pump are not squeezed. In step with the piston stroke, they are only subject to pulsating action, comparable with that of a human vein. Elastic distortion of the hose-diaphragms is pathcontrolled and effected in a concentric manner due to their inherent construction.”
As a result of hydraulic support, the hosediaphragms are subject to little load even under high working pressures. The service life of hosediaphragms is considerably extended beyond that of traditional flat diaphragms, which reflects in very good MTBF( Mean Time Between Failure) and MTBR( Mean Time Between Repair) values.
Steinert technology in US silver mine
Bayhorse Silver Inc says it has received favorable initial test results from testing run-of-mine silver mineralisation from the Bayhorse silver mine in Oregon, USA, submitted to Steinert US, manufacturer of state-of – the-art ore sorting equipment and subsidiary of Steinert Group in Germany.
The Steinert X-Ray Transmission Ore-Sorter( XSS) effectively identified and discriminated between mineralised and non-mineralised silver bearing material, as well as differentiating higher( above 93 g / t or 3 oz / t Ag) from lower( below 93 g / t or 3 oz / t Ag) grade mineralisation. The XSS rejected 37 % from the stream as nonmineralised and retained 63 % of the run-of-mine( ROM) stream. The material was sized between 25 mm and 100 mm, and was comprised of high grade, low grade, and nonmineralised material.
The company will be shipping a larger, approximately 2 t, sample of the Bayhorse
Steinert X-Ray Transmission Ore-Sorter
mineralised material to Steinert US, to establish the crush size for the most effective sorting, and rejection of unmineralised and lower grade( under 93 g / t or 3 oz / t Ag) material. The XSS is designed to sort material at up to 60 t / h from material sized at 10 mm to 200 mm. By narrowing the size range for ore-sorting to between 12.5 mm and 32.5 mm and lowering the hourly throughput, the XSS can achieve better discrimination between low grade and the higher grades, and more effectively upgrade the mineralisation.
Bayhorse CEO, Graeme O’ Neill comments,“ By using the XSS we could increase the proposed daily tonnage throughput from 100 t / d to 150 t / d with no other changes to the current in-place crushing-upgrading circuit. As the XSS uses no water and has a low power consumption requirement, we believe its use could have a substantial effect in reducing processing costs and increasing recoverable mineralisation.”
HAVER and EIRICH tackle coal dust
Enormous amounts of coal dust are generated worldwide. HAVER ENGINEERING GmbH recently
The HAVER Scarabaeus disc pelletiser is being used for coal dust pelletisation but with EIRICH mixing technology as a preliminary stage
52 International Mining | MARCH 2017