FLSmidth Dorr-Oliver Eimco - Flotation, Agglomeration and Filtering

Dorr-Oliver and EIMCO have long been major pioneers and leaders in liquid/solid separation solutions. These well-known companies and brand names both record over 100 years of technical innovation in the minerals processing industry. In August of 2007, Dorr-Oliver and EIMCO joined the worldwide operations of FLSmidth Minerals complementing their Cement and Minerals divisions.

With the added expertise and strength of Dorr-Oliver and EIMCO, FLSmidth Minerals now combines the longest experience in the global market for liquid/solid separation equipment, and has one of the world’s largest installed bases of original equipment, operating under well-known trademarks (Dorr-Oliver, EIMCO, Shriver, and WEMCO) that have long been synonymous with know-how, reliability and performance.

The joint global operations of FLSmidth Minerals provide customers with an enhanced range of products, technologies, and services unmatched in the processing industries.

Few other liquid/solid separation technology suppliers can offer such a broad range of equipment and processes for industrial and environmental applications: vacuum and pressure filtration, mineral flotation, clarification, classification, and thickening equipment, along with OEM quality replacement parts, modernization services and other after-sale services. The breadth of our product lines and technical expertise provides FLSmidth Minerals with incomparable flexibility to design solutions that are perfectly suited to the specific needs of each customer.

Process capability and equipment expertise for minerals processing include the following unit operations:

FLOTATION CELLS

Dependant upon your application, we offer both WEMCO self-aspirating and Dorr-Oliver forced air flotation cells:

WEMCO 1+1 flotation cells and SmartCell flotation cells have a near-surface, self-aspirating rotor combined with a false bottom / draft tube arrangement that is non-plugging. Radial launders and baffles stabilize the froth surface, increasing its surface, grade and froth transport rate. The available SmartCell flotation cell size is 5m³ to 257m³ and the WEMCO 1+1 flotation cell is 20ft³ to 3,000ft³.

Dorr-Oliver forced-air flotation cells have high air dispersion capabilities and easy restarting mechanisms with virtually no short-circuiting. Combined with new Verti-Mix™ mechanisms, these cells maximize coarse particle recovery. They are available in sizes up to 3,500ft³.

SEDIMENTATION – THICKENERS

Dorr-Oliver and EIMCO sedimentation thickener and clarifier units employ principles of gravity settling and range in sizes from pilot models to as much as 600 feet in diameter. They can be used in a variety of industrial applications such as mineral concentrates and tailings, pulp mill wastes, iron and steel mills, and in cement, alumina and chemical plants.

Thickeners and Clarifiers we offer include:

Bridge-Supported Thickeners - Beam or truss-supported units that can be used with light, medium, or heavy-duty applications with diameters available for basins from 2 to 54 m. In this design, the drive is supported by the bridge and drives the rakes with a center shaft. Underflow is removed from a discharge cone at the bottom-center of the thickener. Tanks can be in-ground, on-ground, or elevated. Available lifting devices offer additional flexibility of operation.

Column-Supported Thickeners - Supported by a stationary center column of steel or concrete. The center column supports the drive and rake mechanisms, while the truss extending from the center pier to the tank periphery supports the walkway, power lines and feed launder. These units are suitable for basins and raking arms with diameters of up to 600 feet (180 m). Choice of drive mechanisms and feedwells are available for all our thickeners.

Hi-Rate Thickeners feature patented E-Duc, Dynafloc or Dynacharge feed and flocculation systems in combination with an energy dissipating, deep feedwell to maximize solids settling flux and clarity over conventional thickeners, in a smaller unit area. Raking mechanisms incorporate low drag, high raking efficiency designs to minimize torque at the higher loading rates.

Our paste thickening technology is key to successful tails stacking, mine back-filling, counter-current decantation (CCD) and maximum water and chemical recovery.

EIMCO Deep-Cone paste thickeners deliver thick underflow that approaches the limit of flow ability. They accommodate up to 20 times the solid mass flow and ten times the hydraulic loading of conventional thickeners and out-perform hi-rate and compression type thickeners in producing consistently higher underflow density.

The Dorr-Oliver Paste Production Storage Mechanism (PPSM) is a unique device and process designed to "flash thicken" solids to paste consistency, achieving a density between that of a conventional thickener and a filter. The paste viscosity is controlled to permit storage.

EIMCO E-CAT Clarifier Thickeners provide an innovative patented settling system that packs a liquid-solid separation flowsheet into one vessel. This system consumes a minimum of energy, requires little capital expenditure, and negligible operator attention. The revolutionary E-CAT contains no moving parts and combines optimized flocculation, hi-rate clarification and hi-density thickening in a single compact, rakeless unit.

VACUUM AND PRESSURE FILTERS

Since 1910, FLSmidth Minerals has manufactured pressure and vacuum filters. Today, FLSmidth Minerals offers Dorr-Oliver, EIMCO, and Shriver filtration equipment for minerals processing flowsheets used for concurrent and countercurrent cake formation, cake discharge, washing, dewatering, settling, and drying.

FLSmidth Minerals Pressure Filtration products include: AFP Filter Presses, Shriver Filter Presses, Kelly Filters-Vertical Pressure Filters, EIMCO Beltpress Filters, Gravity Belt Thickeners, Dregs ClariPress Filters, White Liquor ClariDisc Filters, Pressure Tube Filters.

Vacuum Filtration products include: Horizontal Belt Filters, Vacuum Drum Filters, Vacuum Disc Filters, Horizontal Pan Filters, Indexing Belt Filters.

CUSTOMER SERVICES

FLSmidth Minerals offers worldwide sourcing, process testing, flowsheet development, custom equipment engineering, innovative design, manufacturing, construction, startup, rebuild services, replacement parts, OEM parts, filter media replacement and system modernizations. We are there with service and technical support before, during and after delivery, providing you with full equipment life-cycle support.