KREBS® Coal Spirals for fine coal cleaning

Key Benefits

Simple, efficient and cost-effective
Reduced product misplacement
Longer wear life

What we offer

Optimise your fine coal cleaning requirements

In your fine coal washing circuits, achieving a sharper separation means reducing your coal product loss and gaining better yields of low-ash coal. We can help you simplify your circuits, making them easy to operate, leading you to more throughout per unit, better utilisation of your manpower, and an overall higher-quality product.

Spiral coal concentrators use the specific gravity of materials with different densities to separate coal, and produce a low-ash coal product at high efficiency. Our high-performance Coal Spirals deliver a feed capacity of 2 STPH to 3 STPH (1.8 mtph to 2.7 mtph) per start, dependent on raw coal quality and refuse amount to be discarded. Optimum spiral feed size is -1 mm to 0.15 mm (14 M x 100 M).

Featuring a new collection boot design with vortex breaker, these Coal Spirals provide longer wear life and allow you to simultaneously position all cutters – there’s no need to reach into the helix to adjust. The mechanism allows positive lockout once your selection is made, and a revised internal profile assures that no material will be misplaced into other product streams. The internal rotation breaker reduces wear on boot assembly.

We offer a comprehensive range of Coal Spiral units in complete modular designs, which reduce floorspace requirements, and simplify installation and replacement. Modular systems include support framework, feed distribution system and product piping system.

Constructed of wear- and corrosion-resistant materials, choose from single-, double- and triple-start configurations. Our comprehensive range of spiral units also include single-pass or rougher/cleaner compound designs that allow rewashing of coal in a second-stage spiral helix that is immediately following the primary spiral.

Key benefits

Reduce your costs and improve coal quality

Simple, efficient and cost-effective: Our Coal Spiral Concentrators are designed to produce a low-ash coal product at high efficiency while rejecting a high-ash refuse stream.
Reduced product misplacement: The recessed cutter position locks in place, enhancing separation for reduced product misplacement.
Longer wear life: The recessed cutter position locks in place, enhancing separation for reduced product misplacement.

Products features

Coal Spirals with a technologically advanced design

Technical specifications and features of our Coal Concentrator Spirals include:

An integral product piping system that eliminates the need for open launders
Wear- and corrosion-resistant construction
Integral “lock-in-place” cutter positioner and indicator
Recessed cutter position that allows enhanced separation, reducing product misplacement
New product boot design with vortex breaker that provides longer wear life (see details below)
Performance-enhancing berms (see details below)
Transition box (see details below)
Single-, double- and triple-start configurations available
Comprehensive range of spiral units available for coal preparation, including single-pass or rougher/cleaner compound designs
Complete modular designs, including support framework, feed distribution system and product piping system
Assemblies designed to meet your application requirements

KREBS® Coal Spirals

Coal spiral concentrators are designed to effectively clean 1 mm x 0.15 mm material. Spirals offer low maintenance and consistent performance at high capacity. Image on far left is a Triple Start 10 place spiral system. Image on left is a Triple Start, 2 place spiral system.

Our Spiral Collection Boot

Our polyurethane product collection boot improves separation performance, increases capacity and allows positioning of all cutters simultaneously.

Performance

Spiral feed capacity is 2 STPH to 3 STPH (1.8 mtph to 2.7 mtph) per start, dependent on raw coal quality and refuse amount to be discarded
Optimum spiral feed size is -1 mm to 0.15 mm (14 M x 100 M)

New polyurethane product collection boot: Handles allow for simultaneous positioning of all cutters

Adjustable without reaching into helix

Mechanism allows positive lockout once selection is made

Revised internal profile assures no misplacement into other product streams

Internal rotation breaker reduces wear on boot assembly
New polyurethane performance-enhancing berms: Feed berms allow for low-flow conditions without losing coal

Refuse berms ensure no coal loss on very-high-yield coals´

Cleaner berm – we select appropriate style based on your plant conditions
Transition box: Remixes coal and mids prior to final turns

Allows for better separation

Refuse is bypassed to assure no product contamination