MINING SCREENS
“ Screening efficiency has improved , allowing the operators to ‘ manage ’ the screen panel apertures to achieve higher recoveries throughout the overall comminution circuit , resulting in more ‘ sized ’ material reporting correctly to the ball mills . The STM-SCREEN™ will allow mill operators to increase throughput as soon as the downstream processes are expanded with the installation of BM # 3 .”
GK concludes : “ Both immediate and longterm average capacity goals have been exceeded , and the screening quality has improved due to the longer retention time of material on the screen deck . General Kinematics ’ STM-SCREEN™ retains material for approximately 26-33 seconds versus a typical brute force screen that retains material for approximately 6-8 seconds . The longer retention time allows for an optimised material separation as fines have more time to drop out . Equally as important is the ability of the STM-SCREEN™ to process at a higher bed depth without sacrificing throughput . The material spreads out evenly at the feed end , even at higher bed depths . The increased retention time of the evenly spread material allows for increased screening efficiency at the required capacities .”
Metso Outotec to provide ‘ unique ’ sustainable screening tech to iron ore project
Metso Outotec says it will supply unique sustainable screening technology for an iron ore project in the Southern Hemisphere . The order for the product screening and scalping application covers 12 Metso Outotec BSE Series™ ( Banana Screen Elliptical ) tandem screens and 4 MF Series™ screens , all equipped with 305PS screening media . In addition , the contract covers Metrics monitoring system for screens , expert support and installation services , the company says . Metso Outotec explained : “ The need to reduce water in iron ore production and other minerals processing is a critical global challenge . The innovative and patented BSE Series screens enable iron ore processing even with higher natural moisture content without adding water .”
The order value , which is not disclosed , has been booked in Minerals segment ’ s September 2021 quarter orders received . The start-up of the project is scheduled for the first half of 2024 .
Jouni Mähönen , Vice President , Screening business line , Metso Outotec , says : “ We are pleased that the customer chose Metso Outotec for sustainable screening solutions for their process . The BSE screen is an outstanding option for their needs . The elimination of process water ultimately results in lower processing costs , increasing the customer ’ s competitiveness and profitability in the iron ore global markets .” Results the customer can expect after implementation , according to Metso Outotec , include : n BSE Series screens , which are part of the company ’ s Planet Positive solution , enable elimination of process water in the screening process ; n A 93 % reduction of the plant ’ s overall water consumption , elimination of the need for tailing dams ; n Reduced energy consumption from the entire plant compared with the wet screening process : 18,000 MWh / y electricity saving ; n 30 % increase in screening capacity compared with traditional screening ; n Increased safety during media change-outs using the Hammerless Attachment system ; and n Reduced capital expenditure due to the adoption of high-performing BSE screens .
IFE continues long term relationship with LKAB
In LKAB ’ s ore facilities , a number of heavy duty vibrating feeders from IFE Aufbereitungstechnik GmbH are used . The first electromagnetic feeders with stepless capacity control as discharge units of bunkers were supplied in 1975 and they are still in use . “ High quality machinery , professional operation and first class maintenance are leading to lowest operating costs and highest availability over decades . Electromagnetic feeders are part of IFE ' s core product range since the beginning of the company ’ s history . What makes them stand out is the fact that they are operating without any additional lubrication of the drive unit . The unique vibration mechanism allows on-spot dosing of bulk material for any dosing and weighing application . Immediate start and stop of the feed combined with several options of remote control allow the integration in any plant automation system .”
Metso Outotec BSE Series screens are part of its Planet Positive solution
LKAB ' s range of IFE machines was later supplemented by numerous large heavy duty screens and heavy duty feeders with unbalanced exciters . Examples range from a 3,000 mm wide heavy duty feeder nourishing LKAB ’ s primary crusher with bulk magnetite ore ( 0-1,000 mm ) to heavy duty feeders transporting the crushed ore to elevators . 50 mm thick wear plates and machine weights up to about 27,500 kg fulfill the demands of long maintenance intervals and highest operation availability .
“ The screening of material is the basis for high quality end products and leads to a highly stable process flow and optimal preparation of the material for downstream equipment . In the ore sorting facilities of Kiruna , single and double deck vibrating screens with unbalance exciters have been in use since 1995 . Additionally , in 1998 , IFE delivered six harbour screens for the final screening of LKAB ’ s high quality iron ore pellets in Narvik . These huge double deck screens with a total screening area of 52.5 m ² per screen provide a final screening area of 315 m ² before the ships are loaded with thousands of tonnes of this material per hour .”
Derrick ’ s new gold processing Trilogy
Derrick first introduced the gold processing industry to abrasion-resistance and non-blinding polyurethane screens in the early 1980s . Following initial contributions to advance gold processing technology , Derrick has continued to develop new , high-capacity screening equipment . “ Our efforts have focused on reducing operational expenditure ( OPEX ), developing new patented technologies , and minimising maintenance and footprint to reduce environmental impact – all of which contribute to a favourable return on investment .”
The company says its screening solutions provide leaching circuits with technology that leads to efficient gold recovery and demonstrate its firm commitment to advancing gold processing technology . These solutions include trash screens , urethane interstage screens , carbon sizing screens , dewatering screens , tails safety screens and other processing stages . All equipment incorporates Derrick ’ s strong commitment to personal safety by minimising touchpoints .
Derrick now offers its latest innovation – Trilogy™ surface technology – as its most advanced screening system . Trilogy is composed of individual thermoplastic components that may be assembled into various configurations for added flexibility . This new innovation from
Derrick it says can increase gold recovery and reduce operating cost .
And Derrick says it has again “ redefined high capacity , high efficiency , fine particle wet screening ” with the SuperStack ® . “ With eight
International Mining | OCTOBER 2021