2010_Issue26_AngasMine
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Output Austr alia | Augu st 2010 | Pag e9 Author John Durie A case stu dy: Fil ters an d Angas Mine Th e Angas Zi nc Mi ne , located in South Australia, is 100% owned and o pe r at ed by Te rr amin . exceeded all production start- up exp ectations by using the latest te chnology in Outotec Larox CC filters (formerly Larox Ceramec capillary action disc filters), which An as Zinc Mine South Australia expected grades of zi nc and lead concentrate. Following commissioning in Ju ly 2 00 8, si te wa s brought into full produc ti on si x months early, in January 2009. In its first year of life, the low-cost mine, with a resource of 2.4 million tonnes and situated only 60 kilometres from Adelaide, has produced nearly 23,000 tonnes of high-grade lead and zinc concentrate by the end of its second quarter. The mine’s remarkable start-up performance far exceeded expectations and is due in part to an advanced filter ing and drying system. Anga s’s installation of two Outotec Larox CC filte rs (formerly Larox Ceramec capillary action disc filters) for its zinc and lead concentrators, is fed by two Larox Flowsys peristaltic pumps. Outotec Larox CC30 & CC15 filters
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Transcript of 2010_Issue26_AngasMine
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Output Australia | August 2010 | Page 9
Author: John Durie
A case study: Filters and Angas Mine
The Angas Zinc Mine,located in South Australia,is 100% owned andoperated by Terramin
.exceeded all productionstart-up expectations byusing the latesttechnology in OutotecLarox CC filters (formerlyLarox Ceramec capillaryaction disc filters), which
An as Zinc Mine South Australia
expected grades of zincand lead concentrate.Following commissioningin July 2008, site wasbrought into fullproduction six monthsearly, in January 2009.
In its first year of life, the low-cost mine, with a resource of 2.4 million tonnes and situated only 60 kilometresfrom Adelaide, has produced nearly 23,000 tonnes of high-grade lead and zinc concentrate by the end of itssecond quarter.
The mine’s remarkable start-up performance far exceeded expectations and is due in part to an advancedfiltering and drying system. Angas’s installation of two Outotec Larox CC filters (formerly Larox Cerameccapillary action disc filters) for its zinc and lead concentrators, is fed by two Larox Flowsys peristaltic pumps.
Outotec Larox CC30 & CC15 filters
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Output Australia | August 2010 | Page 10
Outotec Larox CC144 filter – 144m 2 filtration area
Hose compressions reduced by 50%
The feed pumps employ a single, bearing-mounted eccentric roller design that compresses each hoseonce during a 360o operating cycle. This feature reduces the hose compressions required by 50%, whencompared to traditional peristaltic pumps that use two sliding shoes.
Filters in action
The two Outotec Larox CC filters in situ use capillary action within ceramic disks to dewater the lead andzinc concentrates. The extracted filtrates are very high in clarity while the dried filter cakes meetrequired transport moisture limits (TMLs) for their ore grades.
After slurry thickening, the pumps feed the relatively coarse lead (P80, 50μm) and zinc (P80, 71μm)concentrates into their respective filtering system. Here, concentrates coat the ceramic disk segmentsduring immersion in slurry baths, dewatering starts immediately via capillary action. Extracted filtratepasses through the microporous structure in each disk before being transferred away by a small 2.2 kWvacuum pump. The dried filter cake that remains is continuously scraped off as the disks rotate.
Quick upgrade
When lead grades rose higher than expected soon after installation, the filters were quickly upgraded,providing Angas with a 30% increase in filtration capacity, allowing the handling of higher leadconcentrates when the ore grade is high. As a result of this upgrade, the lead filter can capably handlehigher lead head grade ore and increase production while still producing filter cake under the required
.
The Outotec Larox CC filter has undergone extensive development to establish itself as a top performerin the global mineral, metallurgical and mining market. This filter, with new ultrasonic positioningbetween the disks, is currently being utilised by Angas at rates of 75% to 90% over a 24-hour period,depending on the ore grade being received.
Filter benefits
e many ene ts o us ng t e utotec arox ters an arox owsys er sta t c nc u e a p ug-and-play design, no downtime is required for maintaining filter disks, only once-a-month maintenancechecks are needed for filter ultrasonics and seals, and routine filter backwashing is automatic and takesonly half an hour per shift. Also feed pump hose leaks can be easily detected, revolution counters canrecord pump hose life (thereby reducing unscheduled stoppages) and processing noise levels can bekept to a minimum.
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Output Australia | August 2010 | Page 11
’ “ ”of his dewatering system. “It’s a good mine that is professionally set out and producing on its investmentbecause things are done right”. So much so in fact, that the Algerian government is interested in whatTerramin are doing at the Angas mine for Terramin’s development of its large Tala Hamza zinc deposit in
Algeria.
John Durie is Regional Director Sales for Outotec Filters Australia Pty Ltd. John has over 30 years experience in mining equipment supply. With experience in drilling, milling, crushing, screening and
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u o ec serv ce eng neer per orm ng final installation inspection
If you would like more information, click here to contact
,Australasia.
OUTPUT AUSTRALIA EDITOR
Laura White – Marketing Manager, Minerals Processing
Tel: +61 2 9984 2500
Email: [email protected]
