TRO Peer Training

TRO Field Operator

Drying Fields

Introductions

What:    Learning Objectives

Drying Fields (Deposition Cells)

Where: All areas of TRO

Why:     Enable you to perform your job safely and   efficiently



Safety:

PPE check

Fire exits

Assembly areas

Bathrooms                                 

Safety devices eg: emergency shutdown (ESD) buttons on equipment

Control Statement:

Stress situational awareness while walking on tour (e.g. watch your step), plan your route.

Drying Field Overview

Tailings Reductions Operations

TRO is an innovative project that is introduced as a way to reduce the amount of tailings ponds being used in mining.  The government created a mandate to mining operations stating that there needed to be a reduction in tailings ponds or else there could be consequences to Suncor’s production or land leases. One way that Suncor responded to this was to begin Tailings Reduction Operations and find a way to remove more tailings from the current ponds so that no new ponds are created while reducing the number of current ponds being used.  This not only helps the environment, but helps Suncor to be more productive as well.

Overview

Process engineers have developed a system where we remove the MFT from the pond and mix it with a compound called a polymer.  Once it is mixed in just the right way with just the right amount of polymer it will become a new product, treated MFT or tMFT. We can pour tMFT out in thin layers over a sloped area of land, a beach, to dry and dry relatively quickly. Once dried it can be removed and used as ground base in returning the mining lands at Suncor to their natural habitats.  This process reduces drying time from years to weeks.

Review

  • Drop block here from left panel or click on block

Mixing

Valves

Valves for Dosing Treated MFT into drying fields

lets check

Injection Valve

Dosage Types

Example #1: Underdosed

This tMFT is flocculated slightly but the treated material will be unable to stack. This means the material runs down the slope of the cell, releasing no water which results in longer drying time.

The consistency of the treated material will be very close to that of the original MFT before the polymer was added.

Example #2: Near Optimal Dose

This tMFT is borderline optimal dosage.

The MFT is more flocculated than Example #1, which means it will stack nicely on the slope of the cell, but has very little water release.

This results in the material taking longer to dry.

Dosage Type

Example #3:Optimal Dosage

This optimally dosed tMFT produces large flocs, stacks well, and releases water within seconds of deposition into the cell. 

Optimally dosed tMFT dries and cracks to evaporate more water within only a few days.

Example #4: Overdosed

This MFT is over dosed. Overdosing the MFT is worse than underdosing or near optimal dosage.

Overdosed MFT will hold a slope but only dries by evaporation, there is no initial water release and will take longer to dry. This results in a negative net water release.

Dosage Monitoring

  • Optimal Dosage
    This optimally dosed tMFT produces large flocs, stacks well, and releases water within seconds of deposition into the cell
  • Underdosed
    This tMFT is flocculated slightly but the treated material will be unable to stack
  • Near Optimal Dose
    This tMFT is borderline optimal dosage
  • Overdosed
    MFT will hold a slope but only dries by evaporation, there is no initial water release and will take longer to dry. This results in a negative net water release

Dewatering

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LocatetMFT in the Image

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Final Exam

Why is monitoring of the deposition cell critical to the operation of treating MFT?

  • Specific dosage and consistency is needed to promote dewatering and short drying time.
  • To Shorten drying time
  • To check Dosage

Which of the following reveals optimum Dosage?

Taking sample

  • - Prepare the sieve by cleaning it and placing it over the bucket to retain released water
  • - Use the scoop stick to take a sample of the tMFT poured from spigots
  • - Take sample to sieve and transfer the material into sieve by spreading evenly throughout the sieve
  • - Cover the sample to keep out the other elements and leave it minimum for 20 minutes or more for best NWR result

What is TRO

  • Tailings Reduction Operations
  • Tailings Residue Operation

Please drag the boxes to correct spot

  • TRO Field
  • Dry Field
  • Spigots