Meyco_Backfill

8/13/2019 Meyco_Backfill

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Solutions for

Mine Backfill

Underground

Expanding Horizons


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Introduction

Backfill, the process of back filling material into the underground voids created

by mining, is essential in many underground operations for the holistic extraction

process. Backfill material types and processes are numerous but normally

utilize a blend of binders, process water and aggregates ranging from rock,

crushed aggregates, gravel and quarried sands to tailings left over from mineral

processing to provide the required restraint to enable massive strategic support

or the underground extraction sequence of the ore. Mine backfill is becoming

more and more important because of the trends in mining to: mine deeper,

optimize ore recovery, optimize water recovery, improve the mine cycle and

optimize production, decrease environmental impact and reduce overall cost.

The type of backfill used depends on geotechnical requirements, the value of

the ore, conditions in the mine, budget, lifetime of the project, experiences, and

available equipment. There is a more scientific approach to this challenge that

can help mining companies understand and run backfill operations at lower risks

and lower costs.

Advanced admixtures can solve various problems associated with backfill

processes. These range from paste to cement aggregate (CAF) types of backfill.

Chemical solutions are available to increase solid content, reduce friction and

segregation, modify rheology and flow, and reduce binder content as well as

costs. We push back the physical limits with our existing technologies such as

retarders, water reducers, superplasticizers, viscosity modifying admixtures

(VMAs) etc. and we are working hard to go even further in all areas of backfilling

operations. Depending on our customers requirements, we can control andachieve: retardation, acceleration, rheology control, modified viscosity, reduce

yield stress and pumping pressures. Furthermore, we can stabilize fines in the

fill matrix and reduce slime run off, segregation and porosity, and also enhance

strength development and optimize binder content.

BASFs industry leading technologies should be considered for new mining

projects as well as existing operations as they create opportunities for the mine

owner to operate systems that are safer, more environmentally friendly and more

cost effective.

Chemical solution with

potential cost reductions

Flow optimization

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The criteria and requirements for backfilling can vary substantially, depending

on the site specific requirements. BASF offers an extensive range of customized

solutions for all types of mine and underground backfill operations, all of which

have been developed with a focus on:

Placing the fill at the lowest possible cost

Improving reliability of fill delivery (ensuring reliable and adequate delivery

volumes)

Maximizing the quality, consistency, uniformity and performances of the fill

Providing a cost-effective, efficient and sustainable backfill solution as a part

of the total mining operation

Improving safety

Minimizing the risk of fill failure or liquefaction

Ensuring adequate early strength

Sustaining long-term strength

Minimizing blockage risk

Achieving dimensional stability after placement

Minimizing segregation

Optimizing production efficiency and maintenance costs

Reducing build-up in the pipe lines

BASFs extensive range of mine backfilling solutions have been developed to

provide the optimum balance of high early strength and sustainable long term

strength, ensuring dimensional stability after placement by meeting (or exceed-

ing) design fill performance requirements.

BASF offers chemical admixtures that aim to make the fill less costly and more

reliable, and reach or exceed the design performance.

Divided into three distinct product categories, BASFs range of backfill admix-

tures includes specialized rheology modifiers, hydration modifiers and durability

enhancers. All products are supported by BASFs extensive training and after-

sales service.

Performance requirements

BASF products and support

Solutions

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Paste Fill: Rheology modifying admixtures can enhance the workability of most

paste fill mixes in the following ways:

Reduced binder usage for any given strength requirement

Reduced pressure losses (longer transportation distance and/or improved flow)

Reduced pipeline wear rate

Improved fill placement (reduced beach angle)

Improved consistency of the fill mix and reduced segregation

Hydraulic Fill: Rheology modifying admixtures improve stability and transport-

ability of a hydraulic fill at a constant solids density or enhance flowability andtransportability of the fill at higher density of the hydraulic fill, resulting in:

Reduced pressure losses (longer transportation distance and/or improved flow)

Reducing blockage risk

Reduced pipeline and mixer wear rate

Increased efficiency and productivity of backfill plant

Decreased energy consumption

Improved fill placement (more consistent and homogeneous properties of

placed fill)

Improved drainage capabilities and significantly decreased fines migration from

the fill (slimes)

Better water management

Reduced binder usage for any given strength requirement

Improved consistency of the fill mix and reduced segregation

The use of selected hydration-controlling admixtures in cemented fills can:

Accelerate or retard the strength gain in the placed fill. This can be an important

issue depending on the mining method and mining schedule.

Control cement hydration prior to fill placement. This can be very useful from an

operational point of view because it reduces the generation of waste and costly

pipeline blockages.

Give possibilities for the operator to manage the process, as fill behavior is con-

trollable by dosage rate.

For specific site requirements and projects, such as those requiring the placement

of the fill into a stope with running water, BASF provides solutions for improving

the durability of the fill. BASFs specialized range of durability enhancing admix-

tures can either be used alone or in a combination to improve fill durability: ver-

satile performances that can meet the needs of even the most demanding project

specifications.

Rheology modifying

admixtures

Hydration controlling

admixtures

Durability enhancement

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www.meyco.basf.com

MEYCO:06/12/ABCrea

Brochures on our underground construction solutions are available at www.meyco.basf.com/mining:

The information given in this BASF publication is based upon the present state of our scientific and pract ical knowledge. As the information herein is of a generic nature, no assumption canbe made as to a products suitability for a particular use or application and no guarantee or warranty as to its accuracy, reliability or completeness either expressed or implied is given.

and for Mineral Processing: www.basf.com/miningchemicals

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Meyco_Backfill

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