classic | mobile
 

Search...

SA Instrumentation & Control Buyers' Guide

 

Good level control on flotation concentrators
September 2016, Level Measurement & Control


“The link between level control and profitability on a flotation concentrator is often under-estimated or even overlooked, and yet accurate control measurement is the key to increased lifespan for plant and plant equipment, thereby increasing its operational profitability,” said Richard Rule, director of eDart Slurry Valves, based in Jet Park, Johannesburg.

The purpose of a flotation concentrator is to recover the most amount of valuable mineral to the concentrate, whilst at the same time keeping the quantity of concentrate down to a minimum, which enables the highest recovery of valuable mineral at the desired grade to be achieved. This is known as the ‘grade/recovery curve’ for the concentrator.

Rule added, “The aim on a typical platinum concentrator is to reduce the volume of concentrate to be approximately 1% of the volume of the plant feed, while recovering more than 85% of the metal. The volume of concentrate that will be produced as a result limits the extent to which the grade should be allowed to reduce in order to increase recovery.

“The control system on all concentrators strives for the optimal point on the grade/recovery curve. The level control valve is the final piece of equipment in the process of valuable mineral reporting, either to the concentrator as product, or being lost to the tails as waste.”

If the level measurement is above the setpoint, the grade produced will drop as the volume of concentrate increases, but the recovery will increase, and conversely when the level is below setpoint the recovery will drop off and grade will increase. “It is clear to see that maintaining a stable level at setpoint is vital to achieving an optimal performance of the flotation concentrator – if this does not occur then profitability is reduced dramatically. A 1% increase of recovery at optimal grade at a typical large flotation plant can equate to hundreds of thousands of Rands profit per month. On marginal concentrators it could be the difference between a viable mine operation or not,” said Rule.

Required good level control parameters

eDart believes that the following para-meters need to be considered carefully in order to obtain good level control:

• Process parameters being known and kept within the design envelope.

• Plant layout designed with good level control in mind.

• Level control valves selected and sized correctly.

• Valves installed, commissioned and maintained correctly.

• Level measurement and control working optimally.

• Advanced control system for flotation banks comprising more than two flotation machines in series.

Brian Whitehead, technical plant superintendent for Northam (Booysendal) added, “We have in the past called on eDart to assist us in resolving technical problems that have arisen with equipment. After getting to grips with the challenges we faced, eDart delivered an effective and long lasting solution. As an OEM, eDart is not only passionate about its unique customer solutions, but also commits to ensuring that its products perform exceptionally well. It is this customer commitment and relationship building that sets the company apart.”

“eDart has been active in the supply of slurry valves to the mining and related industries since 2004 and this accumulated wealth of experience enables us to assess customer requirements and offer a tailor-made solution,” concluded Rule. “Plant layout and valve technology selection, for example, are but two critical elements to operating a more profitable plant. eDart is about the provision of effective solutions to the environment within which our valve technologies are to be applied, ensuring customer requirements are not only successfully met, but met in the most efficient way.”

For more information contact Richard Rule, eDart, +27 (0)11 823 6620, richardr@edart.co.za, www.edart.co.za


Credit(s)
Supplied By: eDART Slurry Valves
Tel: +27 11 823 6620
Fax: +27 11 823 6602
Email: sales@edart.co.za
www: www.edart.co.za
Share via email     Share via LinkedIn   Print this page

Further reading:

  • Accurate groundwater level measurement – hydrostatically
    December 2017, Instrotech, Level Measurement & Control
    Measurement specialist Keller offers probes to monitor groundwater and filling levels in tanks under a wide range of conditions.
  • eDART valves and process samplers enhance efficiency at Booysendal plant
    December 2017, eDART Slurry Valves, News
    eDART dual valves and poppet samplers continue to offer exceptional level control at Northam’s Booysendal plant near Lydenburg, Mpumalanga. eDART Slurry Valves director, Richard Rule commented: “When ...
  • Maintenance-free level detection with IO-Link
    November 2017, ifm Electronic RSA, Level Measurement & Control
    The LMC family from ifm electronic reliably monitors levels, e.g. in machine tools or wastewater management, or protects pumps from running dry. The option of a thread at the back permits variable installation ...
  • Endress+Hauser offers radar via online shop
    October 2017, Endress+Hauser, Level Measurement & Control
    The new free space radar Micropilot FMR10 offers various significant product features in regards to innovation and efficiency. It is a radar measuring device with Bluetooth wireless technology. Commissioning, ...
  • 3D level measurement and detection
    September 2017, ifm Electronic RSA, Level Measurement & Control
    ifm’s photoelectric 3D level measurement and point level detection system detects solid, opaque solids and bulk materials in tanks, silos or hoppers with levels of up to 10 m. The O3D reliably detects ...
  • Reliable level measurement for smarter cider production
    September 2017, Endress+Hauser, Level Measurement & Control
    Ciders have been growing in popularity over the past few years and South Africa has experienced robust year-on-year growth in volume terms. However, consumers in South Africa have become more discerning ...
  • Hygienic transmitter for pressure or hydrostatic level
    September 2017, Instek Control, Level Measurement & Control
    The new Anderson-Negele L3 pressure and level transmitter.
  • Float-based level measurement is ideal for fermenters
    August 2017, WIKA Instruments, Level Measurement & Control
    Measuring instruments with a float are influenced neither by foaming nor by electrical conductivity or dielectric constants.
  • Krohne’s new radar level transmitters
    August 2017, KROHNE, Level Measurement & Control
    Krohne has added six new 24 and 80 GHz transmitters to its Optiwave series of FMCW radar level transmitters, targeted at liquid and solid applications in a wide range of industries. Based on over 28 years ...
  • A diamond in level measurement
    June 2017, VEGA Controls SA, Level Measurement & Control
    This article explains how one operator at a diamond ore processing plant was able to gain significant advantages by switching to radar level measurement at 80 GHz.
  • ABB’s laser level measurement for the mining industry
    June 2017, ABB South Africa, Level Measurement & Control
    To operate any process efficiently, it is essential to measure, actuate, record and control. ABB measurement products have provided world-class measurement solutions for industry, utilities and municipalities ...
  • Level measurement probes for flotation applications
    June 2017, Instek Control, Level Measurement & Control
    This article aims to introduce the LTM-2 level measurement probes from Instek Control as an alternative to traditional measurement systems employed throughout the flotation industry. The LTM-2 probe was ...

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual





 

         
    classic | mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.