News from Schwing Bioset

Two Solutions from Schwing Bioset in June International Mining Magazine


Schwing Bioset, Inc. is excited to be featured in the Paste Supplement section of International Mining's June 2016 issue.The article discusses Schwing Bioset's recently commissioned pump solutions for backfill and thickened tailings challenges.

View the Paste Supplement section where Schwing Bioset's projects are discussed.

View the entire International Mining June issue on their website.

You can read more about these and other projects on our blog.  To learn about Schwing Bioset's Mining Solutions, contact Miguel Jahncke or visit our Mining Pumps page.

 

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Tags: Mining, Mining Pumps, Paste Backfilling, Mining Paste, Tailings

Solving Several Challenges with One Schwing Bioset Solution

 

Written by Miguel Jahncke, March 10, 2016

In late 2012, Volcan Compania Minera S.A.A.’s Victoria mineral processing plant, located in the Yauli district, department of Junin in Peru, was facing a number of challenges including the approval of their Environmental Impact Statement for the capacity expansion from 2,400 to 4,000 tpd of ore.

The project also required the expansion of the Rumichaca Tailings site to accommodate the increased production levels. Pumping thickened tailings, rather than conventional tailings, was determined to be the best long-term and financial solution to handle the mining rejects. The project continued to evolve in that direction. 

In mid-2014, when the final solution for the thickened tailings transport was being evaluated, it was determined that the solution offered by Schwing Bioset, its model KSP440 piston pump, was ideal for the project for the following reasons:

  • The KSP 440 unit is capable of the required maximum flow of 185 m3/hr as well as reduced flow of 92 m3/hr when at low plant production rates, which is expected at certain times by idling a module within the pump.
  • Half of the pump can be idled while half continues to operate allowing for preventive maintenance to be performed while operations continue at a slower pace or to accommodate unscheduled downtime.
  • Elimination of additional and costly stand-by equipment, with the modular pump arrangement.
  • Drastic reduction of water hammer in the discharge line without the use of Pulsation Dampeners through PLC synchronization that monitors and adjusts the timing of the pumping strokes.
  • Electric motor and hydraulic redundancy in the power pack allowing partial capacity in the event of unscheduled maintenance.

To learn more about this project specifically or our mining pumps, please contact this blog’s author, Miguel Jahncke, call 715.247.3433, and/or visit our website here: SBI Mining Pumps.

 

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 Download Our Brochures    or Application Reports

 

Tags: Piston Pumps, Mining, Mining Pumps, Mining Paste

Schwing Bioset adds Synergy Controls as Mining Rep in Ontario and Manitoba

 

January 12, 2015 (Somerset, WI) 

Schwing Bioset, Inc. is pleased to announce that Synergy Controls Corporation (Sudbury, ON) has signed on as their Mining Representative in Ontario and Manitoba. Schwing Bioset is a worldwide leader in thick product pumping and material handling solutions. “Synergy Controls’ extensive knowledge of mining processes and excellent reputation in the market in serving their customer base make them a great choice as a partner,” explains Scott Springer, Schwing Bioset’s Vice President Sales & Marketing.  “They have a great presence both at the mines and with the Engineering contractors”.

Mike Gribbons (President of Synergy Controls Corporation) stated, “Schwing Bioset was our first choice for a high pressure slurry pump.  Schwing impressed us with both their experience and technology.   Coupling that with, North American made systems and a large inventory of completed pumps and spares fully complements our paste and back fill solutions. This allows our clients a “one stop shop” providing pumps, valves, instruments and control solutions.”

Miguel Jahncke (Schwing Bioset Director of Mining Solutions) is excited about this key partnership. “The Synergy Controls organization’s history of providing mining clients with engineered solutions supports Schwing Bioset’s mission of providing the best high solids content slurries transportation and handling solutions in the mining industry. Their efforts at the Ontario EPCM’s will help Schwing Bioset’s mining business globally.”

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www.synergycontrols.com                                    www.schwingbioset.com

Tags: Piston Pumps, Schwing Bioset, Pumps, Hydraulic Pumps, Mining Pumps, Slurry Pumps, Paste Backfilling, Mining Paste

Schwing Bioset Featured in E&MJ Engineering and Mining Journal

Paste: A Maturing Technology

Pump Supports Backfill Operation at Mexican Mine

engineering and mining journal

Paste backfilling, the process by which a combination of tailings, water and cementacious materials are blended and used to fill voids in underground mining operations, provides a broad range of benefits. These can include an improvement in safety, the ability to make subsequent surface development possible, a reasonable solution to the ever-present problem of what to do with tailings, and more. It’s not surprising, then, that Canadian miner Agnico-Eagle chose paste backfilling as the key tailings disposal method for one of its newest developments, the Chihuahua, Mexico-based Pinos Altos mine. But while creating the paste is one issue, getting it to the mine stopes—which in this case can be anywhere from 1.5 to 2 km away—is another one entirely. To make that happen, Agnico-Eagle turned to a pump model from Schwing Bioset (Somerset, Wisconsin, USA), and is reporting impressive performance delivering material in this around-the-clock operation.

Back into the Ground
Located in the Sierra Madre gold belt, 140 miles (225 km) west of the capital of Chihuahua state, Pinos Altos contains reserves of more than 3.5 million oz of gold and 100 million oz of silver. Operational as a surface pit since 2008—with underground mining started in 2010—the 27,180-acre (110-km2) site is expected to generate yearly outputs of 170,000 oz of gold and 2.5 million oz of silver through the year 2028. The end result of that gold milling operation is a steady stream of tailings—a volume which is currently about 2,500 t/d but could easily be doubled with an increase in production. According to Moises Palma, engineer in charge of the site’s paste plant, paste backfilling was always the method of choice for tailings disposal at Pinos Altos.

“The tailings operation was designed with this procedure in mind,” said Palma. “Currently, we take waste material by conveyor from the milling plant, and run it up an inclined belt into a batch plant. There, the tailings make their way through a process in which they are combined with cement and water to create a paste. The cement—roughly 5% of the overall mixture—is added to make the paste suitable for filling and supporting the existing underground cavities that have already been mined.  Once the correct mixture is achieved, it is dropped down into the hopper for the paste pump and ready for delivery back to the mine.”

Mine backfilling is hardly a new concept. What has changed over the years, however, is the characteristic of the backfill material itself. In the past, to accommodate the limited pumping technology available in most mines, tailings had to be turned into a slurry with a water content of 70% or more. By comparison, the paste material generated at Pinos Altos is stout, with a water content of roughly 30% and a slump generally in the 8-in. (203-mm) range.

Technology Changes the Game
The difference between what could once be pumped and what can be moved today has been mining companies’ preference for piston pumps over centrifugal pumps in tailings operations. Where other previous technology offered limited pumping pressure (often as low as 10 bar), the Schwing KSP 140 H(HD)XL pump in place at Pinos Altos provides a maximum conveying pressure of 130 bar with paste outputs up to 85 m3/hr—ideal, according to Palma, for moving the high-solids material long distances.

The Schwing pump we use here at Pinos Altos is perfect for what we do,” he said. “This is a challenging application, given the thickness of the paste, the distance it has to be pumped—currently about 1.5 km—and the pump’s almost continuous operation. Yet, we are getting a steady rate of about 126 tons of material pumped every hour—roughly 2,500 tons per day. We have been extremely pleased with that kind of performance.”

Based on the nature of the paste and the desired production rates, engineers from Schwing-Bioset recommended its XL pump option for the Pinos Altos operation. Poppets in the XL series are designed to reduce material velocity through the poppet housing.  Doing so minimizes the pressure drop through the valve housing, increases the filling efficiency of the pumping cylinders and reduces wear on the poppet discs, seats and pumping rams—all of which lead to better performance and less downtime.

To keep the pump running and the paste flowing, Pinos Altos relies on an air-cooled Model PP2400 drive unit that is powered by twin 400-hp (300-kW) motors, also supplied by Schwing Bioset. This is mounted adjacent to the pump at the base of the paste plant, and includes PLC-based controls. While the initial plan was for the pump to operate up to 10 strokes per minute and deliver 126 t/h, operations are running so smoothly that mine officials are looking to raise production another 20%.

Safety Leads the Way
As mentioned above, the decision to use a paste backfill is generally based upon the benefits that the technique provides. At Pinos Altos, it enhanced overall mine safety by providing mining crews with dramatically improved structural stability within the stope. Palma says their operating procedure for that facet of the job is far more than simply pouring mud into a hole.

“We are pumping into three main stopes and doing so in three-foot lifts with three days between pours,” he said. “Not only does that allow enough time for the paste mixture to harden, it also avoids placing the massive stress load on that cell and adjacent areas that would be present if we filled it all. This first cell alone will be taking on more than 13,000 tons of material, which is over 8,300 m3 of paste.”

To put that figure into context, 8,300 m3 ( 10,855 yd3) is enough material to bury an entire basketball court over 13 ft (4 m) deep.

Though the other two stopes currently being filled are smaller—one will hold 7,100 tons and the other 6,600 tons—they still represent a sizable movement of material from the paste plant to the mine.  Discharge into the cells is monitored via closed-circuit camera to ensure the process runs smoothly and any problems can be quickly spotted.

Looking Ahead
In addition to making the mining effort safer, paste backfilling at Pinos Altos is also addressing a number of other concerns that have plagued similar mining operations for decades. Most notable of these is the issue of how to best dispose of tailings from the cyanide-based gold recovery operation. Traditional approaches such as surface storage, while initially less expensive, can bring unwelcome environmental impacts. Paste backfilling not only solves those concerns, it does so in a manner that eliminates the mine dewatering necessary with other disposal efforts.

“This has been a very successful approach to tailings disposal for us,” said Palma. “As a result of what we do here, the mining operation is safer, there is almost no impact on the environment and, over time, it is actually a lower cost alternative to other methods. Agnico-Eagle has already started talks to boost production by almost twice what we are doing now. When that happens, we will add another pump from Schwing Bioset which will allow us to handle between 5,000 and 6,000 tons per day. We know they will be up to the task and we are excited for what lies ahead.”

Tags: Piston Pumps, Mining Pumps, Paste Backfilling, Mining Paste