a new salt slag/black dross recycling process · 2017-11-02 · norcast conference, arendal-norway,...
TRANSCRIPT
![Page 1: A New Salt Slag/Black Dross Recycling Process · 2017-11-02 · NORCAST Conference, Arendal-Norway, 31st May 2017 A New Salt Slag/Black Dross Recycling Process Alan M Peel C.Eng Managing](https://reader030.vdocuments.us/reader030/viewer/2022040507/5e42b8122974de108d6dcf69/html5/thumbnails/1.jpg)
NORCAST Conference, Arendal-Norway, 31st May 2017
A New Salt Slag/Black Dross Recycling Process
Alan M Peel C.Eng
Managing Director - ALTEK Group
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NORCAST Conference, Arendal-Norway, 31st May 2017
Aluminium Dross and Salt Slag
• Both waste streams from aluminium/dross recycling
• > 2 mtpy of aluminium drosses per year globally
• > 2 mtpy of salt slags generated in Europe
• Both of these waste streams can be totally circular as they contain a lot of Al and also the residual oxides can be re-used.
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NORCAST Conference, Arendal-Norway, 31st May 2017
GOOD DROSS MANAGEMENT
Recover 10-20% of this Al and capture remaining Al in skull
Recover 5-10% Al, and also saltsand NMP (oxides) for re-use
Minimise Dross in Furnace
Recover 40-60% of this Al in rotarysalt furnace
STEP 1
STEP 4
STEP 3
STEP 2
50-70% Al in resulting dross*
40-50% Al in resulting dross skull*
5-10% Al in resulting slag*
* By weight
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NORCAST Conference, Arendal-Norway, 31st May 2017
Issues with salt slag
• Typical cooling times are 24 to 36 hours before shipping• Requires large area for cooling
– special heat resistant concrete floors, – or racking systems– Many dross/slag bins
• Aluminium in the slag can burn off/develop AlN’s• Dealing with the environmental issues for transportation• Temperature for shipping < 100°C• Logistics, distances and costs for transportation to
recycling centres• Cost of recycling
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NORCAST Conference, Arendal-Norway, 31st May 2017
Salt Slag Cooling –Typical
Cooling times typically 36 hours
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Salt Slag Cooling with Slag Pressing
Cooling time after 15 min press cycle now 4 hours
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NORCAST Conference, Arendal-Norway, 31st May 2017
• Aluminium
• Alumina Oxide (Al2O3)
• Spinels (MgO.Al2O3)
• Aluminium Nitride (2AlN)
• Aluminium Carbides
• Aluminium Sulphites (trace)
• Aluminium Phosphates (trace)
7
Typical solid components in dross
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NORCAST Conference, Arendal-Norway, 31st May 2017
Possible Gaseous Components of Dross are:
• NH3 (Ammonia)
• H2S (Hydrogen Sulphide)
• H2 (Hydrogen)
• SO2 (Sulphur Dioxide)
• CO2 (Carbon Dioxide)
• CH4 (Methane)
• NH4OH (Ammonium) Hydroxide)
• Phosphine
• Phosgene (possibly)
8
So its not just the salt slag you have to consider !
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NORCAST Conference, Arendal-Norway, 31st May 2017
Aluminium Metal compound reactions with water
• 2AlN + 3 H2O 2NH3 + Al2O3 (Ammonia)
• 2Al + 3H2O 3H2 + Al2O3 (Hydrogen)
• Al4C3 + 6H20 3CH4 + 2Al2O3 (Methane)
• Al2S3 + 3H2O 3H2S + Al2O3 (Hydrogen Sulphide)
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NORCAST Conference, Arendal-Norway, 31st May 2017
Project – ALUSALT – Timeline
• New ALTEK/EU development project initiated in 2011
• Objective ‘small and medium scale’ local salt recycling at salt slag generation source
• Small capacity pilot plant was operational by late 2014 at ALTEK –200kg/day
• Funding for full scale demonstration unit secured in Q3 2015
• Design of full scale system completed – Q1 2016
• Installation started end Q1 2017• Operational by end Q2 2017
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NORCAST Conference, Arendal-Norway, 31st May 2017
ALUSALT - Key Principles
To provide a cost effective solution for recycling salt slag at source of generation From 3000tpy to 30,000tpy
Benefits:- Massive reduction in transportation of salt slag around
Europe Fuel cost savings Environmental issues reduced CO2 footprint reduction
Re-use of own salt (avoids ‘other things’ being in it) Re-use of own aluminium Provide security and viability of recycling operation Re-use of energy released from salt slag at plant
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Front end crushing
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NORCAST Conference, Arendal-Norway, 31st May 2017
ANALYSIS OF PRE-PROCESSED MATERIAL(MIXED SCRAP AND DROSS)
Salt Slag Analysis – Pre-Treatment
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NORCAST Conference, Arendal-Norway, 31st May 2017
Crushing – Stage 1
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NORCAST Conference, Arendal-Norway, 31st May 2017
Crushing Stage 1 - Output
cm
0 1 10
20
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Crushing – Stage 2
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NORCAST Conference, Arendal-Norway, 31st May 2017
ECS Stage 2
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Aluminium recovered (Pressed vs Unpressed)
100cm
1 20
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NORCAST Conference, Arendal-Norway, 31st May 2017
Crushing Stage 2
100
cm
1 20
> 3mm
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NORCAST Conference, Arendal-Norway, 31st May 2017
ECS – Aluminium recovery
10
0cm
1
cm
100 1 20
Stage 2 Stage 3
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Final Crushing - Stage 3 –Pre-Wet stage
100
cm
1 20
< 3mm
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NMP – Stage 1 Filtering
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Dried NMP
100cm
1
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NORCAST Conference, Arendal-Norway, 31st May 2017
ANALYSIS OF POST PROCESSED MATERIAL(MIXED SCRAP AND DROSS)
NMP – Analysis
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Inert NMP
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Steel Industry as a Synthetic Slag (Al2O3)
Rock Wool
Cement Industry
Bricks/Tiles (additive)
Sandblasting
Refractory
Ceramics
Flux
Miscellaneous
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Target end use of NMP
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NORCAST Conference, Arendal-Norway, 31st May 2017
ALUSALT - Salt
• Moisture < 0.3%
• Yield >98%
• Same consistency as input salt ratio
10
0cm
1 20
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Plant Design
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Plant Design
3D images from Stephen
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NORCAST Conference, Arendal-Norway, 31st May 2017
Plant Design
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NORCAST Conference, Arendal-Norway, 31st May 2017
Plant Design
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Plant Construction
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NORCAST Conference, Arendal-Norway, 31st May 2017
Plant Construction
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• Recover the Aluminium
– 1000kg of dross (containing 70% Al) 700kg 700kg
– Press to get 10-20% of the Al in drain 105kg 140kg
– Secondary recover 50-70% of the Al 327kg 392kg
– Recover 5-10% Al from the salt slag 25kg 50kg
• Re-use the NMP (oxides) – end markets
• Re-use the Salt – closed loop
• Overall recovery * 68%(low) 83%(high)
* From available aluminium in the dross
Closing the loop on Dross and Slag
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NORCAST Conference, Arendal-Norway, 31st May 2017
1. Efficient dross management in cast house exists
2. Efficient dross recycling systems already exist (Salt Furnaces)
3. Mini salt slag plant solution innovation the next step Process proven on pilot scale plant Q1 2015 – Q2 2016
Tested wide variety of salt slags from differing sources
Adaption and modifications to design completed allowing scale up to start
Full scale demonstration plant design completed Q1 2016
Procurement completed end 2016
Installation started Q1 2017
Operating plant by end Q2 2017
To allow complete Al recovery from waste streams at place of generation.
Summary