1994
DOI: 10.21000/jasmr94010129
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Evaluation of Neutralization Potential Determinations for Metal Mine Waste and a Proposed Alternative

Abstract: Standard acid-base accounting (standard ABA), modified ABA, and B.C. Research initial static tests tended to overestimate the neutralization potential (NP) present as calcium carbonate and magnesium carbonate, with the extent of overestimation depending on the minerals present in the 10 metal-mine wastes examined. For 6 of the 10 samples the static test NP values were within about 10 kg/mt CaC0 3 of the calculated mineralogic NP. These samples were composed largely of qua1tz and sheet silicates (mica, chlorite… Show more

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Cited by 31 publications
(13 citation statements)
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“…The leachates from the amended cells were characterized by circumneutral pH values and were less charged with chemical species than the control cell, except in the case of Ca, which was released more from cell C5 (5 wt % OPC) (Summary of chemical analysis is presented in Table S1). In fact, the dissolution of carbonates and OPC produces alkalinity and buffers the pH of leachates [11,15,31,38,[57][58][59][70][71][72][73][74][75][76][77][78][79]. The pH was established early, due to high dissolution rates of limestone and cement in the acidic media.…”
Section: Discussionmentioning
confidence: 99%
“…The leachates from the amended cells were characterized by circumneutral pH values and were less charged with chemical species than the control cell, except in the case of Ca, which was released more from cell C5 (5 wt % OPC) (Summary of chemical analysis is presented in Table S1). In fact, the dissolution of carbonates and OPC produces alkalinity and buffers the pH of leachates [11,15,31,38,[57][58][59][70][71][72][73][74][75][76][77][78][79]. The pH was established early, due to high dissolution rates of limestone and cement in the acidic media.…”
Section: Discussionmentioning
confidence: 99%
“…(6) LAPAKKO PROCEDURE FOR DETERMI NATION ON NEUTRALIZING POTENTIAL OF METAL MINE WASTE (Lapakko, 1994) is a modifi cation of the BC RESEARCH INC. INITIAL TEST PROCEDURE and includes crushing to 325 mesh and titration with acid to pH 6.0 instead of 3.5.…”
Section: Discussionmentioning
confidence: 99%
“…Le PA est calculé plus facilement en utilisant le soufre total de l'échantillon (déterminé par analyse chimique) et en le multipliant par un coefficient stoechiométrique de 31,25 (Tableau 2). Lawrence et Wang (1997) ont suggéré une modification du test de Sobek et al (1978) en utilisant la même mé-thodologie sans toutefois bouillir l'échantillon ce qui éviterait une surestimation du PN causée par le chauffage de l'échantil-lon et qui ferait réagir des minéraux relativement réfractaires (silicates comme les plagioclases, les pyroxènes et les olivines, Lapakko 1994;Frostad et al 2003) qui ne réagiraient pas dans les conditions naturelles comme sur un site minier. Dans la méthode de Lawrence et Wang (1997), on ajoute nettement moins d'acide à l'échantillon et en plusieurs étapes (à 0h, 2h et après 22h) afin de garder le pH de la pulpe entre 2,0 et 2,5.…”
Section: Tests Statiques Chimiquesunclassified
“…Le Tableau 3 résume les principales approches. Kwong (1993), Lapakko (1994), Li (1997), Lawrence et Scheske (1997), et Paktunc (1999a et Bouzahzah (2013a) proposent des calculs basés sur la somme des contributions individuelles de chaque minéral dans la production de l'acidité et sa neutralisation donnant ainsi, selon ces auteurs, une estimation plus juste des PA et PN. Lapakko (1994) propose un calcul du PN très simple basé sur la participation de la calcite et la magnésite assumant qu'elles sont seules responsables de la neutralisation.…”
Section: Test Statiques Minéralogiquesunclassified