Polishing Filters
R E L B I E H C S FILTRATION SOLUTIONS
Scheibler Applications in Mining & Metallurgy Increasing requirements for higher product quality from metal refineries have resulted in the need for pure electrolyte streams requiring polishing filtration. Scheibler Poli shing Filter Applications The increasing use of hydrometallurgy has also increased the need for polishing filtration to recover valuable products from waste streams. Since 1971 Scheibler Polishing filters have earned a reputation for delivering better process performance, reliability and low operating costs. The applications in which Scheibler polishing filters are used include:
Metallurgy Copper refineries • Electrolyte recirculation • Electrolyte decant after de-anoding • Anode slimes plant electrolyte return • Anode scrap wash water • Cathode wash water • Wastewater treatment Zinc refineries • Solution purification (Cu, Ni/Co, Cd, Sb) • Wastewater treatment (precipitated heavy metals recovery) Nickel & cobalt refineries • Neutral Solution Clarification • Barren Liquor Clarification • Solution Purification (Fe, Zn, Cu, Al, Mn) • Electrowinning solution polishing (catholyte and anolyte) Gold/silver merrill crowe plants • PLS clarifier overflow • Post precipitation Au/Ag recovery
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Metal concentrates • Wastewater treatment (precipitated heavy metals recovery) • Recirculation of process water
Product Description The Scheibler filter is used for the removal and recovery of solids in low concentration from process liquids. The quality of the resulting filtrate increases production capacity while boosting the quality of plant and refinery products. Scheibler filters exploit the phenomena of adsorption filtration to cause micronic and sub-micronic particles to adhere to the fibers of the filter media, despite being small enough to pass through its pores. This activity reduces particle concentration in the filtrate to almost undetectable levels. Filter aids, such as precoat and body feed, are unnecessary in the vast majority of applications, but if required the filter can be operated with filter aids without modification. All models feature a unique fully programmable cloth cleaning and cake discharge system. With filtration areas of up to 720 m 2 available, process flow sheets can be simplified by installing a reduced number of filters. Scheibler filters are manufactured in materials resistant to highly corrosive solutions and high process temperatures.
Scheibler testunit
Thousands of filter installations worldwide: • Copper electro-refining • Zinc refining • Nickel refining • Gold/silver merrill crowe process • Cu, Zn, Ni/Co solvent extraction feed solutions • Cu, Zn, Ni, Co electrowin electrolytes • Manganese dioxide electrolytic & chemical refining • PGM/Base metal refinery solutions • Concentrator or refinery waste water
Scheibler A Series
E Series fnal assembly
Benefits High Quality Filtration Adsorption filtration reduces particle concentrations to a level of parts per million. Production capacities increase, as do the quality of plant and refinery end products.
Low Operating Costs Costly filter aids, such as precoat and body feed, are unneccessary in the vast majority of applications. This also considerably reduces the volume of total cake solids disposed in the environment. Low electrical energy consumption is another cost-saving benefit, as the adsorption filtration uses very low pumping pressures.
Minimal Maintenance Cost With no moving parts, the operating cost typically equates to 1.25 cents (US) per m3 of filtrate produced. The unique cloth cleaning and cake discharge system ensures maximum
cloth lifetimes. Normally the filter is only opened periodically to replace filter cloths.
Fully Automati c Operation Automatic (PLC) control of the cloth cleaning and cake discharge steps at the end of each filtration cycle ensures maximum filtration time in subsequent cycles. This also cuts manpower requirements by eliminating the need for frequent supervision.
High Capacity, Compact and Expandable All Scheibler filters occupy little building space. Flow rates as high as 600 m3 /hr can be consistently handled by a single unit, greatly simplifying the process. Most units are designed with expension capability, economically accommodating growing capacity requirements.
E series elements
Typical Applications • Thickener/ clarifier overflows • Solvent extraction and electrowin feed solutions • Pressure & vacuum filter filtrates • Centrifuge centrates • Prior to crystallisation or precipitation • Inorganic pigment recovery
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Operating Principles 1. Filtration During normal operation the slurry is fed into the filter vessel through the process inlet by a centrifugal pump. All Scheibler filters are rated for process pressures of 300 kPa and feeding systems are designed to maintain laminar flow within the vessel to ensure adsorption filtration.
2. Draining 1. Filtration
2. Draining
In the beginning of the cloth cleaning and cake discharge cycle the filter liquid level is drained to the top of the filter elements.
3. Air Agitation In the agitation phase low pressure air is fed to the filtration vessel through a manifold below the filter elements. This causes vigorous bubbling and scouring of the filter cake attached to the filter cloth bag. During agitation the filter cake is removed from the filter cloth bag, and efficient mixing causes the filter cake to be re-slurried. 3. Air agitation
4. Drain with backwash, wash spray and air agitation
5. Drain with wash spray and sluice spray
6. End o the cleaning activity (cleaning complete)
4. Drain with Backwash, Wash Spray and Air Agitation In this phase the filter vessel is drained through the outlet. Simultaneously, the filter cloth bags are backwashed and sprayed on the outside while air agitation continues.
5. Drain with Wash Spray and Sluice Spray During the final draining phase the lower air sparge continues to keep the re-slurried filter cake in suspension while the lower sluice sprays direct solids towards the drain outlet, ensuring complete cake and slurry removal until the filter vessel is empty.
6. End of the Cleaning Activit y (Cleaning Complete)
Slurry Filter cloth
The cleaning sequence is complete, when all cake has been removed, The unit is ready for filtration.
Filtrate Wash filtrate Wash liquid
7. Refilling Vessel for Filtration (Restart)
Solids
With cleaning complete and all valves closed, slurry pumping resumes.
Air Vacuum 7. Reflling vessel or fltration (restart)
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Athmospheric air
Scheibler E series solution or purifcation
Comprehensive Design Assistance Let Larox help you design the optimum filtration plant for your process. Our services include: • Application consultancy • Filtration testing • Filter and ancillary sizing • Plant layout concepts
Drawings: • General arrangements • Foundation • P&I diagrams • Piping
WE CONTINUE TO SUPPORT YOU WITH OUR COMPREHENSIVE GLOBAL AFTER SALES SERVICE.
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Scheibler Polishing Filters Fixed Position Nozzles and Pipework All process pipes are connected to nozzles on the non-moveable head unit, leaving the opening access shell free to roll easily aside. The wet cake is discharged as a slurry through the drain line enabling easy cake handling.
Automatic Flange Locki ng System The automatic flange locking system is designed for simplified vessel maintenance and cleaning. With less bulky tapered main flange profiles, this optional hydraulic vessel closure method speeds up routine maintenance and offers swift access to vessel internals. Once the main flanges are open, the shell ends are retracted by hydraulic cylinders.
Retractable Shell The movable shell slides easily on steel wheels and rails, automatically disconnecting and withdrawing the overhead wash spray manifold. During routine maintenance this also allows easy access to check the spray nozzle. Scheibler automatic fange locking system
Expandable Filters If greater filtration area is required for growing process throughput most Scheibler double flange D and E series filters can be be expanded with additional elements and internal manifolds. A Series filters also have a flexible combination of element frames that can be configured for expansion.
Rectable shell
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Scheibler E series
Rigid Element Frames Standard AISI316L steel frames support the filter media cloth bags with separation chains or springs providing full span support and a permanent exit route for the filtrate. Other corrosion resistant materials, such as SAF2205, SMO254 and titanium, are available to meet process requirements.
Wide Range of Convenient Filter Vessel Formats Different plant and process conditions are catered for with a wide variety of sizes in four filter vessel configurations. The long-established C Series rectangular vessel is also still available, up to a maximum of 120 m². This compact design, which features a top opening access lid, is suitable for flow rates between 10 to 80 m³/h in situations where floor space is limited.
Larger flows are catered for with the D and E Seriesof horizontally mounted cylindrical vessels. Flow rates of 50 m3 /h to 600 m3 /h can be handled, and all filter sizes are available in a comprehensive range of corrosion resistant materials, including rubber-lined vessels with titanium or C276 internal wetted components. The vertical through floor cylindrical A Series features a conical base that serves to concentrate discharge slurry.
Scheibler installation
Pressure Vessel Codes Most of the national and international pressure vessel codes are available in Scheibler filter pressure vessel construction, including ASME IIIV Div 1, PED 97/23 EU, A.D Merkblatte, AS 1210, PRC M, stamp.
Scheibler C series
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Scheibler ASeries Filters The A series produces higher cake solids concentration (% w/w) than C, D and E Series polishing filters as the cake solids settle in the conical bottom with multiple filtration cycles for each wet cake discharge. Greater capacity for higher feed solids concentration (% w/w) than C, D and E Series polishing filters as the specialized pulsed cloth cleaning sequence enables shorter cloth cleaning cycles (reduced dead time). Cost-effective design results in maximum filtration area for vessel size. Requires minimal installation space due to vertical through floor vessel configuration. Employs the same adsorption filtration principle as in C, D and E Series polishing filters.
A Seri es m2
Effective filter area Number of elements
A6/ 6
A6/ 10
A10/ 10
A13/ 15
A15/ 15
30
45
60
90
160
175
4
6
6
10
13
15
Height
mm
Weight
kg
Width
mm
1 310
1 580
2 040
Diameter
mm
1 108
1 380
1 812
Inlet diameter
mm
80NB
100NB
150NB
Max working pressure Wash water Process air The technical data is subject to change without notice.
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A4/ 6
3 140 2 234
3 438 2 373
2 513
kPa
3 991 2 652
2 791
2 931
300
3
m
/cycle
1.1
1.3
2.0
2.9
4.9
5.2
3
/cycle
40
56
75
107
176
192
Nm
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Scheibler ESeries Filters Large flow rate capacity
These truly giant polishing filters can handle flows up to 800 m³/h when configured to operate with filter aids and as high as 600 m³/h in standard adsorption configuration. Maximum achievable flow rates are established during in-process testing or are based on our wide-ranging process information data base built up from experience in over 1500 installations worldwide. Cost effective construction
Scheibler E Series filters range from 200 m² to 720 m² in filtration area. The larger horizontal cylindrical configuration generally requires small
crane/hoist availability for routine element changes. The fixed head unit is double flanged for expandable options and features easy retracting shell coverings. Automated shell retraction systems are available for difficult processes, that require frequent opening. Expandable to meet new demands
The largest unit in the series, the Scheibler E36/36 features thirtysix 20 m² elements with Quadrex* cloth (18 per side). Smaller units, such as the Scheibler E28/36, can be expanded from 560 m² to 720 m² with an insertion of 8 extra elements and a corresponding movable shell.
Scheibler DSeries Filters Single flange Scheibler D Series filters offer filtration areas ranging from 80 m² to 180 m². The horizontal cylindrical configuration enables easy maintenance access from floor level. The fixed head unit enables permanent connection to process pipework and
has an easy rolling retracting shell covering. Economical design format
These medium-sized units offer good capacity in an economical vessel design.
Scheibler DDSeries Filters Scheibler DD Series filters offer filtration areas ranging from 80 m² to 360 m². The familiar horizontal cylindrical configuration features a double flanged fixed head unit for expandable options and easy retracting shell coverings. The largest unit in the series, the Scheibler D36/36 features 36 x 10 m² elements with Quadrex* cloth per side. Smaller units, such as the DD24/36, can *) Quadrex = 100 % x Max fltration area
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be expanded from 240 m² to 360 m² with an insertion of 12 extra elements and corresponding movable shell. Automated shell retraction systems are available for diffi cult processes where rapid access is needed. All Scheibler polishing filters are available with insulation and electrical heating wraps as factory fitted options.
ESeri es m2
Effective filter area Number of elements
E12
E16
E20
E24
E28
E32
E36
240
320
400
480
560
640
720
12
16
20
24
28
32
36
Length
mm
3 149
3 629
4 104
4 584
5 064
5 544
6 024
Weight
kg
6 293
6 804
7 389
7 901
8 412
8 924
9 435
Width
mm
2 900
Height
mm
3 541
Inlet diameter
200NB
Max working pressure Wash water Process air
250NB
kPa
300NB
300
m3
/cycle
8.5
10.7
13.2
15.4
17.6
19.7
21.8
3
/cycle
250
290
330
370
410
450
490
Nm
DSeries m2
Effective filter area Number of elements
D8
D10
D12
D14
D16
D18
80
100
120
140
160
180
8
10
12
14
16
18
Length
mm
2 074
2 274
2 474
2 674
2 874
3 074
Weight
kg
2 234
2 373
2 513
2 652
2 791
2 931
Width
mm
1 976
Height
mm
2 541
Inlet diameter
mm
Max working pressure
100NB
150NB
kPa 3
300
Wash water
m
/cycle
3.9
4.6
5.3
6.1
6.8
7.5
Process air
Nm3
/cycle
100
110
130
140
150
160
DDSeri es m2
Effective filter area
20
22
24
26
28
30
32
34
36
200
220
240
260
280
300
320
340
360
20
22
24
26
28
30
32
34
36
Number of elements Length
mm
3 248
3 448
3 648
3 848
4 048
4 248
4 448
4 648
4 848
Weight
kg
3 131
3 307
3 446
3 725
3 864
4 004
4 143
4 282
4 422
Width
mm
2 029
Height
mm
2 541
Inlet diameter
mm
Max working pressure
kPa
Wash water
m3
150NB
200NB 300
/cycle
8.5
9.2
9.8
10.5
11.2
11.9
12.6
13.3
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The technical data is subject to change without notice.
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Performance for Life • Safety
Larox provides its customers with an unrivalled combination of process expertise and service. Larox delivers complete filtration solutions, which exceed the customers’ expectations. Larox offers a comprehensive Performance for Life service concept for its filtration solutions. Larox’s customer-centered services begin with strategic lifecycle planning already at the investment phase. A nominated customer support engineer handles each project together with the project manager, providing a familiar and reliable point of contact for the customer throughout the entire lifetime of the filtration solution. Start-up and training services ensure optimal performance, while reliability is maintained
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through spare part services, service agreements and maintenance support. Filter performance can be further enhanced through process optimization and modernizations. Finally, Larox offers refurbishment and relocation/resale services that maximize the value of the original filtration investment. Larox’s mission is to work together with its customers on a day-today basis to achieve their system
• Reliabil it y • Sustainability • Process Results
and process objectives for the entire lifetime of the solution. To support customers in achieving competitiveness in their business, Larox helps them maximize availability, minimize operating cost and optimize process results. The Performance for Life service concept developed by Larox has proven to be an optimized, costeffective and high-quality approach that meets the individual needs of customers.
Testing for Optimal Results Larox offers a versatile range of test filtration services. After each test the client receives a detailed report, quantifying the technical and economic benefits of the Larox solution.
Bench Test Filters
Test Reports
Our bench test pressure and vacuum filters are used for preliminary screening and when only a limited amount of slurry is available. These test filters are also available to clients who wish to perform regular tests on their slurry.
Larox testing produces dewatered solids and filtrate samples using slurry obtained directly from the client’s process. Larox test reports indicate the most appropriate filter type and potential process improvements. Testing can be conducted at the Larox Research Center or at the client’s facilities.
Laboratory Filters Our laboratory pressure and vacuum filters simulate the process at the client’s production site on a smaller scale. All process and cost benefits of the application are projected with reliable,repeatable test results that can be used for filter sizing.
Pilot Filters
Research The Larox Research Center evaluates test results and advises test engineers on the best methodology for each process. The Research Center continuously updates the testing equipment to ensure accurate results. It also maintains the Larox Databank, a source of information on over 10 000 filtration tests.
Larox test engineers work closely with the client’s personnel to conduct test filtration for full-scale process evaluations on site. Pilot units can be connected directly to the client’s filtration process. Larox has a range of pilot filters for pressure, polishing, capillary action vacuum, and vacuum belt filtration to meet all possible process requirements. Pilot testing typically takes place after laboratory scale testing.
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Larox Automation System With experience in designing fully automatic equipment for over 30 years, Larox is the undisputed leader in filtration automation. The Larox solution today goes far beyond the simple automation of functions.
Complete Filtration Plant Control The Larox automation system automates, optimizes and visualizes the entire filtration process, allowing filtration plant operators to achieve better filtration performance and cost-efficient operations with minimal intervention. Larox automation solutions include plant floor level automation for all filter types, as well as corporate-wide visualization, real-time reporting and availability analysis of the filter plant. All Larox automation solutions are based on the same proven architecture with modular functions customized to each instalation. The system provides plant operations, maintenance and management with the data, condition monitoring information, reporting and visualization needed to keep both equipment availability and production costs on target. Modem or web-based remote support from Larox’s experienced local or global service team helps ensure continuous automated operation.
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• Fully automated filter plant control • Electrical and instrumentation engineering • Process control and optimization • Real-time data acquisiti on, analysis and visualization • Control room, local area network, and webbased reporting • Seamless integrati on with office software • Advanced real-ti me diagnostics • Remote access for comprehensive support • Conti nuous product improvement during product li fecycle
The Larox Group Advantage Experience. Technology. Products. Service. People. Unrivalled Appli cation Experi ence With extensive application experience within the industry, Larox provides optimal solutions for clients’ filtration needs. From bulk mined products and metal concentrates to metallurgy, the experience of Larox provides the assurance that every application will perform to specification and operate to budget.
Leading Technologies All Larox members are technology leaders in their own right, with proven track records in translating research and development into solutions that deliver superior process results with increased capacity, system reliability and total cost-effi ciency.
World-Class Product Portfolio
Larox People
Larox brings together the innovative products of Larox, Hoesch, Pannevis, Ceramec and Scheibler. With this extensive range of filtration products, Larox can specify the optimum solution for virtually any mining or metallurgical application. The Larox portfolio extends beyond products to filtration plant design assistance and ancillary selection.
Larox is built on the expertise, talent and skills of each employee. Many Larox employees have worked in the mining and metallurgical industries and understand their needs. Worldwide, the Larox personnel pool their experience and partner with the Larox clients to develop the optimal solution for their needs.
Larox Service Performance for Life Larox’s global after-sales service ensures continuously high equipment and process performance. Process optimizations, preventive maintenance, operation and maintenance training, total productivity improvement and product-upgrade services are just a few ways in which Larox Service supports clients for the life of their solutions.
Further information on Larox and its products, downloadable brochures, data sheets and application case studies are available at www.larox. com and from your nearest Larox representative.
Sisu People to People Progress 15
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www.larox.com Larox Corporation P.O. Box 29 FI-53101 Lappeenranta Finland Phone +358 20 768 7200 Fax +358 20 768 7277 E-mail
[email protected]
Sertified Quality System SFS, Certificate No 1398-05. Compiles with the requirements of standard SFS-EN ISO 9001 Copyright @ 2008 Larox Corporation. All rights reserved. Larox is a registered trademark of Larox Corporation.
