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British Columbia Mine Reclamation Symposium
Modification of the Net Acid Production (NAP) Test Lapakko, Kim; Lawrence, Richard W.
Abstract
The Net Acid Production Test (NAP) was developed as a hydrogen peroxide-based static test for the prediction of acid rock drainage which could be applied in the field. Previous evaluation indicated the test underestimated the Net Acid Production Potential of mine waste samples. Recognizing that this error might have been the result of incomplete oxidation of iron sulphide minerals in the mine waste, modifications to the test were introduced, primarily to enhance the degree of oxidation. Ten mine waste samples were characterized (particle size, chemistry, mineralogy) and subjected to the modified NAP test, standard Acid Base Accounting, Modified Acid Base Accounting, and the B.C. Research Initial static tests. The results of the NAP test were quantitatively comparable to those of the; other static tests. Comparison of the sulphur content of four samples before and after the NAP Test indicated that 95 to 99 percent of the sulphur initially present was oxidized by the hydrogen peroxide digestion. It was concluded that the modification improved the extent of iron sulphide mineral oxidation and, consequently, the accuracy of the test.
Item Metadata
Title |
Modification of the Net Acid Production (NAP) Test
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Creator | |
Contributor | |
Date Issued |
1993
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Description |
The Net Acid Production Test (NAP) was developed as a hydrogen peroxide-based static test
for the prediction of acid rock drainage which could be applied in the field. Previous evaluation
indicated the test underestimated the Net Acid Production Potential of mine waste samples.
Recognizing that this error might have been the result of incomplete oxidation of iron sulphide
minerals in the mine waste, modifications to the test were introduced, primarily to enhance the
degree of oxidation. Ten mine waste samples were characterized (particle size, chemistry,
mineralogy) and subjected to the modified NAP test, standard Acid Base Accounting, Modified
Acid Base Accounting, and the B.C. Research Initial static tests. The results of the NAP test
were quantitatively comparable to those of the; other static tests. Comparison of the sulphur
content of four samples before and after the NAP Test indicated that 95 to 99 percent of the
sulphur initially present was oxidized by the hydrogen peroxide digestion. It was concluded that
the modification improved the extent of iron sulphide mineral oxidation and, consequently, the
accuracy of the test.
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Extent |
647646 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-20
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0042225
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Other
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Copyright Holder |
British Columbia Technical and Research Committee on Reclamation
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International