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Services offered by EKATO: Analysis of mixing processes Simulation and testing in 3 l, 50 l and 1 m horizontal and vertical models Optimized agitator designs Design optimization, e.g. designs and best locations for acid feed pipes, slurry draw-off points and gas feed pipes CFD simulations Stress calculations of vessels and internals using FEA EKATO mechanical seals and integrated seal support systems Materials of construction include titanium, duplex steels, Inconel, Hastelloy Protective coatings for impellers Consulting / training at customers plant site Worldwide service facilities

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3Alumina ProcessingEKATO develops customized agitation equipment to optimize mixing performance for all applications in aluminaplants. For precipitation vessels the multistage VISCOPROP design achieves a uniform solids concentration frombottom to top at an optimal energy input. Particle concentrations of 1000 g/l or even higher can be handled.

Ore slurries exhibit shear thinning or Bingham plastic flow pro-perties. Non-Newtonian rheology with high apparent viscosityrequires that the agitator design prevents cavity formation-whichwould lead to reduced mixing efficiency of the vessel volume.

2EKATO Lab TestingEKATO offers laboratory testing facilities at different scales and vesselgeometries. For autoclave feed tanks and similar applications, tests arecarried out with original samples. Using test results and EKATOs wellproven design procedures, scale-up to commercial scale designs can becalculated with confidence. 100% mixing efficiency can be achieved atminimum power input and agitator size. Flow behavior of samples can bemeasured with a rotational viscometer.

Measurements / services : Mixing time characteristics Solids suspension

Residence time distributions (solid / liquid) Mass transfer Flow velocities Power numbers ungassed / gassed Radial forces on the shaft Surface phenomena Rheological properties Particle characterization (microscopy) Validation of CFD models

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Flow velocity distribution in an aluminiumhydroxide precipitation vessel

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Shear Rate

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Other ApplicationsEKATO supplies agitators for a wide range of applications, such as: CIL, CIP, CN-Detox,Autoclave Feed Tanks, Neutralization Tanks, Hydrogen Reduction Autoclaves, SulphidePressure Leach Autoclaves, Sulphide Precipitation Autoclaves, Storage Tanks, etc.

1 Directed strong axial flow towards the problem zones.

2 Reversed flow lifts the particles and evenly distributes them throughout the tank.

3 Two large vortices divide the vessel into two sections; this has to be consideredcarefully when choosing feed pipe locations.

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4High Pressure Acid Leach

(HPAL)The innovative EKATO solution for horizontal autoclavesThe process performance of the first compartment of anindustrial leach autoclave effectively controls the overallprocess efficiency of the entire autoclave. Rapid blendingof the slurry and sulfuric acid as well as homogeneoussolids suspension are strongly influenced by the mixingefficiency.

A specially developed hydrofoil impeller improves blen-ding and solids suspension in the compartment. Theproblem zones at the lowest point of the hemisphericalhead and at the lowest point at the overflow weir requirestrong directed flows provided by the new EKATO hydro-foil impeller.

This fullfills the solids suspension criteria most economi-cally. Power reductions of the order of 30% are achieved

compared to standard impeller systems. Mixing times aremuch lower compared to conventional systems, resul- ting in faster and more efficient mixing of the slurry andsulfuric acid. Optimization of the feed point designs andlocations leads to even better process results. Dependingon the rheological behavior of the slurry one- or two-stageimpeller designs are recommended.

5 Atmospheric LeachEKATO specializes in design of agitator systems for specific gaseous mass transfer require-ments, regardless of the feed gas dilution. EKATO systems combine agitator and spargerdesigns that enable extremely high gassing rates without affecting solids suspension, andat the same time minimizing the required installed power for the agitator.

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7EKATO Titanium AgitatorsEKATO manufactures all titanium welded parts in a clean room which hasbeen specially developed for this purpose. Continuous monitoring of the

6Pressure Oxidation (POX)To achieve a sufficiently high oxygen transfer rate during acidic pressure oxidation (POX) of sulphide concentra- tes different impeller designs are selected. An optimized Rushton impeller design is often chosen if abrasion isan issue due to the ore type. The impeller tip speed and therefore abrasion of the impeller blades is minimized.In combination with coated impeller blades impeller lifetimes are maximized. In other cases specialized impellerdesigns for gassing applications like the EKATO PHASEJET or the EKATO COMBIJET are recommended to providehigh oxygen transfer rates and oxygen utilization with reduced motor sizes.

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AdvancedProcessSolutions

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8EKATO Mechanical SealsESD Seals are robustly designed. Negligible loads

on the product side of the seal rings due to the ESDspecific pressure compensator concept and perfect-ly controlled seal temperatures by direct cooling of the seal and flanges increase the lifetime of theseals significantly. In conjunction with fully automa- ted refill systems together with cooling and emer-gency operations, false operation can be prevented.Thus overall system availability can be increased, re-sulting in reduced maintenance and life cycle costs.

1. Automatic rell and cooling system for 6 agitators2. ESD64H - Heavy duty high pressure seal3. ESD64H - Cross sectional drawing4. Pressure compensator

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On-site supervision Training of operating and maintenance personnel Start-up support Overhaul, inspection, maintenance Repairs Spare parts service Preventive maintenance 24-hour service worldwide

EKATO SERVICEWith EKATO your service is in good hands. TheEKATO worldwide service network guarantees theshortest reaction times to all questions concerningmixing technology and for all EKATO products.

Furthermore EKATO Service is your partner for acomplete range of service requirements: from fullservice contracts to spare parts all from onesource. EKATO Service has taken the lead world -wide for mixing technology and agitator servicing.

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America

ArgentinaBrazilCanadaChileMexicoUSAVenezuela

Europe

AustriaBelgiumBulgariaCroatiaCzech RepublicDenmarkFinlandFranceGermanyGreeceGreat BritainHungaryIrelandItalyNetherlandsNorwayPolandPortugalRussiaSerbia andMontenegroSlovakiaSloveniaSpainSwedenSwitzerlandTurkey

Africa / Asia / Australia

AustraliaChinaEgyptHong KongIndiaIndonesiaIranIsraelJapanMalaysiaPakistanPhilippinesSaudi ArabiaSingaporeSouth AfricaSouth KoreaTaiwanThailand

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EKATORhr- und Mischtechnik GmbH

Kppelemattweg 279650 SchopfheimGermany

Tel. +49 (0) 7622 29-0Fax +49 (0) 7622 29-213e-mail: info@ekato.com

EKATO Corporation

48 Spruce StreetOakland, NJ 07436USA

Tel. +1 201 825 4684Fax +1 201 825 9776e-mail: info.vus@ekato.com

www.ekato.com