Harsco Mineral CSA: A Sustainable Solution to Acidic Water from Refuse Piles & Abandoned Mine Sites
-
Upload
michael-hewitt -
Category
Technology
-
view
573 -
download
0
description
Transcript of Harsco Mineral CSA: A Sustainable Solution to Acidic Water from Refuse Piles & Abandoned Mine Sites
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
Harsco Engineered Environmental Systemfor Coal Refuse Treatment
Abandoned Mine Reclamation ConferenceAugust 9th, 2013
© 2013 Harsco Corporation, All Rights Reserved.
Overview
2
Harsco Coal Refuse Study – Third Party
Background
Coal Refuse Characterization
Test Setup
Results
Conclusions
Harsco Mineral CSA Briquettes
3
Global Business Platforms
The world’s largest provider of on-site, outsourced services to the global metals industries. More than 160 sites in 30 countries. Environmentally-responsible, mineral-based products for a range of commercial and industrial uses
The world’s most complete global organization for highly engineered rental scaffolding, shoring, concrete forming and other access-related services. Operating at approximately 200 sites in over 40 countries
Global railway track maintenance services and equipment
Energy-efficient air-cooled heat exchangers, heat transfer equipment, and industrial grating products
METALS & MINERALS
© 2013 Harsco Corporation, All Rights Reserved. 4
© 2013 Harsco Corporation, All Rights Reserved.
Harsco EES Material
Pennsylvania DEP approved - GP WMGR049 Agriculture Mine grout AMD treatment Mine buffering agent Construction material Road base reclamation and soil stabilization Raw material for
Concrete Asphalt Grout
5
© 2013 Harsco Corporation, All Rights Reserved.
Harsco EES Material
100% Recycled Material
Calcium/magnesium silicate
Can sequester heavy metals
Long-lasting
Does not armor
pH 12 ± .2
Soluble Alkalinity - 1510 mg/L compared to 30mg/L for limestone
60+% passing #100 sieve
90% + CCE
6
7
8
Stream Restorations – Reeds Run
9
© 2013 Harsco Corporation, All Rights Reserved.
Stream Restorations – McIntire Site
10
© 2013 Harsco Corporation, All Rights Reserved.
Stream Restorations – Neal Run
11
© 2013 Harsco Corporation, All Rights Reserved.
Stream Restorations – Jennings Environmental Center
12
© 2013 Harsco Corporation, All Rights Reserved.
Coal Refuse Treatment Studies
2009-2010 first study
2011-2012 in-house study suggested potential for neutralizing coal refuse.
2012-2013 third-party study results Using Harsco’s calcium/magnesium silicate material to cover or
underlie coal refuse has value for new and existing piles Inter-mixing coal refuse and the Harsco calcium/magnesium
silicate material can eliminate acid formation Blending with coal refuse provides a sustainable solution,
eliminating effluent acidity, iron, aluminum, and manganese
13
© 2013 Harsco Corporation, All Rights Reserved.
2012-2013 Third-Party Study
Recent Study Test America, Pittsburgh Rosebud McVille coal processing plant refuse Three refuse columns per test Simulated rainfall for Western Pennsylvania
SPLP extraction fluid #1 40.26” average rainfall per year
Column testing is far more rigorous than field application
All of the rain water passing through test material
14
© 2013 Harsco Corporation, All Rights Reserved.
Coal Refuse Characterization
ABA Overburden and Mine Soil Analysis (G&C) 2.32% total sulfur 2.0 paste pH 0 fizz intensity 72.5 tons per thousand tons CaCO3 equivalent
Chemistry and Mineralogy (PMET) XRF XRD
C 32.97% Al2Si2O5(OH)4 Kaolinite 18.8%
S 2.07% SiO2 Quartz 15.1%
Fe2O3 6.0% KAL3Si3O10(OH)2 Muscovite 12.0%
Al2O3 16.2% KFe3(SO4)2(OH)6 Jarosite 5.3%
MnO .01% Ca(SO4)•2H2O Gypsum 2.3%
CaO 1.1% CaSO4 Anhydrite .6%
MgO .4% FeS2 Pyrite .5% 15
© 2013 Harsco Corporation, All Rights Reserved.
Coal Refuse Test Setup
Blended
BlendedTreatmentControl
48” PVC
4” Diameter
Filter Cloth
Not to scale
Top and/or Bottom Treatment
© 2013 Harsco Corporation, All Rights Reserved.
Coal Refuse Test Setup
© 2013 Harsco Corporation, All Rights Reserved.
Coal Refuse Test Setup
18
Coal Refuse Test Setup
19
Coal Refuse Test Setup
20
Coal Refuse Test Setup
21
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved.
Highlighted Results were Non-Detects
* Results measured in PARTS PER BILLION
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved. © 2013 Harsco Corporation, All Rights Reserved.
© 2013 Harsco Corporation, All Rights Reserved.
ABA vs. Harsco’s Method
32
ABA –Mine Drainage Prediction & Overburden Analysis Neutralization Potential Percent of Sulfur “Fizz” Testing
ABA does not take into account Particle size/specific surface area Armoring
© 2013 Harsco Corporation, All Rights Reserved.
Harsco Mineral CSA vs. Limestone
Harsco Mineral CSA Limestone Fines
CCE 90% + 78 to 85%
RNV 90 to 98% 65 to 70%
Soluble Silicon* 113 to 114% 0 to 5%
pH ~12.2 ~9.6
Soluble Alkalinity 1510 mg/L 30 mg/L
*Using wollastonite as the standard33
© 2013 Harsco Corporation, All Rights Reserved.
ABA vs. Harsco’s Method
Harsco’s Method using Mineral CSA Particle size/specific surface area The mineralogical makeup
Calcium Silicate Magnesium Silicate
Mineral CSA contains no calcium carbonate due to high heat (3200 degrees) of steel making process.
Si:Fe - High silicon to iron ratio – Mineral CSA ties up some of the iron preventing it from reacting with sulfur. This reduces pyrite formation.
Effect of Fe - Sulfur to Iron ratio is affected – less iron (especially in the form of pyrite) means less available sulfur for acid generation
Mineral CSA removes the Hydrogen ions so they are not available for other acid generation. Silicate forms mono-silicic acid not carbonic acid. This is a much weaker acid.
34
© 2013 Harsco Corporation, All Rights Reserved.
Conclusions From Results
Blended pH control with a small % of Harsco’s calcium/magnesium
silicate material Virtually eliminates leaching of Fe, Al, and Mn Significant reduction of:
Electrical conductivity Total dissolved solids Redox potential Sulfate concentration
Refuse pile benefits Considerable cost reduction potential Greatly reduced liability exposure Sustainable environmental solution
35
Blended
© 2013 Harsco Corporation, All Rights Reserved.
Systems - Currently in Use
Geomembrane base liner
Untreated Coal Refuse
Harsco EES Material
Harsco EES Material
Reactive
Reactive
Geomembrane cover liner
Geomembrane base liner
37
38
39
© 2013 Harsco Corporation, All Rights Reserved.
A Better Way
Geomembrane cover liner
Geomembrane base liner
Untreated Coal Refuse
TreatedCoal Refuse
Reactive
Neutralized
From ThisTo Sustainability
Covered with Harsco growing
medium
© 2013 Harsco Corporation, All Rights Reserved.
Systems - Sustainability
TreatedCoal Refuse
Neutralized
Cost-effective
Lower risk
Better for the environment
Potential alternative uses of land
Sustainable
Covered with Harsco growing
medium
© 2013 Harsco Corporation, All Rights Reserved.
Harsco EES Value
Reduced operating costs Plant and equipment Manpower Treatment materials
Reduced environmental Impact 100% recycled material No CO2 generated as with Ca(OH)2
Enhance compliance with DEP regulations Champion Processing & Rosebud mining have had bond
releases
42
© 2013 Harsco Corporation, All Rights Reserved.
Harsco EES Value
Impact costs including: Trusts Bonds Site preparation
Liners General Topsoil
Reduced risk and liability exposure
43
© 2013 Harsco Corporation, All Rights Reserved.
Harsco’s Engineered Environmental System
44
Fast Acting pH Control
Environmentally Friendly
Consistent Performance
Does Not Armor
Immobilize and Detoxify Metals
Harsco EES
Precipitates Metals
Reduced Long-termLiability Exposure
Limited pH Control
Limestone
Can Precipitate Metals
Short-Term TreatmentArmors
Reduce/Eliminate Bonds and Trusts
Sustainable Solution
Long Lasting
Invaluable
Harsco Growing Medium
Cost reduction exceeding several
million dollars
Reduce/EliminatePlant and Operating CostsControl System Changes
Harsco Mineral CSA Briquettes
45
© 2013 Harsco Corporation, All Rights Reserved.
Harsco Mineral CSA Briquettes
46
© 2013 Harsco Corporation, All Rights Reserved.
Harsco Mineral CSA Briquettes
47
Harsco Mineral CSA Briquettes
Berkebile Run Kiski Conemaugh Valley Conservancy
48
© 2013 Harsco Corporation, All Rights Reserved.
Harsco Mineral CSA Briquettes
49
Berkebile Run
Harsco Mineral CSA Briquettes
50
Berkebile Run
© 2013 Harsco Corporation, All Rights Reserved.
Harsco Mineral CSA Briquettes
51
Berkebile Run
© 2013 Harsco Corporation, All Rights Reserved.
Questions or Comments
52