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1994-02-28_REVISION - M1988112 (2)
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1994-02-28_REVISION - M1988112 (2)
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Entry Properties
Last modified
6/20/2021 12:09:42 PM
Creation date
11/21/2007 6:33:15 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Revision
Doc Date
2/28/1994
From
KIM LAPATKO
To
HARRY
Type & Sequence
TR7
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Lapakko, KA. 1990. SoGd• se Chazacteriza[ion in Conjunction with D• lution <br />Ezperiments for Prediction of Drainage Quality. Presented at Western Regional <br />Symposium on Mining and Mineral Processitlg Wastes. Sponsored by Society for <br />Mining, Metallttrgy, and Exploration (SME), and the San Francisco Section, SME. <br />May 30 -June 1, 1990, University of en a[ Berkeley. p. 81-86 Chapter 10 <br />SOLID PHASE CHARACTERI7ATION LN CONNNCiION {PITH DISSOLUTION EKPERIMENTS FOR <br />PRLTIICTION OF DRAINAGE OL'ALITY <br />Kim Lapakko <br />Minnesota Department of Natural Resources <br />D Sv ision of Hine role <br />ABSTRACT <br />Kinetic Ce s[s permit !dent if ica[Son of some <br />acid-producing solids based on the laboratory <br />drainage pH. However, i[ Ss pose 161e [hat <br />solids which generated alkaline drainage during <br />[he kinetic [es[ time frame you ld have generated <br />acid drainage had the experiments been con- <br />tinued. This possible error in class if is atfon <br />vas addree sad by detetmining the time required <br />[o deplete [he avallab le acid generating poten- <br />tial and the acid neutralization potent ial. A <br />mixture of an alkal lne so 11d and sulfide-bearing <br />rock vas sub]ected [o vet-dty Lytle disco lution. <br />A 20-veek period vas selected as the experi- <br />mental duration of a predictive test, and the <br />drainage pH vat alkaline over this period. The <br />rate of neutral lzat ion by carbonate mineral <br />d is aolut ion vas determined based an cha <br />appearance of calcium and magneelum in solution <br />over this period. The time of neutralization <br />potential dap let ion vat calculated based on cha <br />initial neutralizat loo potential of the mixture, <br />ad]ua[ed For background tort[ ributlone, and [he <br />observed neutralization rate. The calculated <br />value vat in good agreement with the drainage <br />quality observed subsequent [o veek 20. <br />m1[igat LOn dee ign to be tailored [o the potential <br />for environmental impact of clue vaeta drainage. <br />/ The pH of mine vaete dralna;ge Se determined <br />largely by [he dlaeolu[lon of ,,eIISnarale present Sn <br />the vaete. the dis solo[ ion ox~ Sron sulfide <br />minerale leads to cha productl~on of acid, ae fa <br />indicated by reaction 1 (Nslamn, 1978). the <br />FeS(s) + (J/2)RZO + (9/4)0~(g) - <br />Fe00N(a) + 502 (eqh + 2H+(aq) (1) <br />oxide[ ion of trace metal gulf dee releases trace <br />mecala from cha highly £naolu la aul£id• mineral <br />form but does not contribute acid (react ion 2). <br />Cu5(e) + 2 02(g) - Cut+(aq) + 5062-(aq) (2) <br />The ac ld produced by the axld~t ion of iron <br />sulf idea can ba neutralized b} cha dieaolut ion of <br />calcium carbonate (react Sons ~, 4). <br />CaCOJ(e) + 2H+(aq) - R2C0J(aq) + Cat+(aq) (J) <br />CaCOJ(e) + H+(aq) - HC03 (aq) + Cat+(aq) (4) <br />INTRODUCTION <br />To reduce the potential for abandoned mine <br />drainage prob lame, [he EPA hat recently pub- <br />lished draft rules for regulating metallic <br />mineral mining undec its Resource Conse rvac ion <br />and Recover Ac[ (RCRA) Subtitle D authority. <br />Plans for closure and poet-closure care of mine <br />wastes are an important aspect of these rules <br />and must be submitted to prior to mine develop- <br />ment. In order [o design such plans prior [o <br />mine development, pro]ected mine vat [es must be <br />evaluated for their potential to release acid <br />and trace metals. Existing data on a mine <br />waste of siml lar composic ion, generated by <br />similar mining methods, and exposed to similar <br />environmental conditions for an extended [Sete <br />provide the best lnd SCator of drainage ;uallty. <br />S lnce these data are rarely available, is is <br />necessary [o conduce predictive testa. Such <br />testing will alloy the nlc ing, conacruttSOn, and <br />Hagnea Sum carbonate dieaolut ion can provide <br />buffering by react lone simf laK to 3 and 4, <br />although the dissolution rate may be slaver. <br />5111cace mineral die eo lot ion will also neutral Sza <br />acid, but ac a yet clover ratY (Lapakko, 1988). <br />The balance between the races of acid production <br />by Sron sulfide oxldat ion and hoot rock buffering <br />will date retina the acidity of mine vaece drain- <br />age. That Sa, the drainage will remain neutral <br />as long as the rate of acid neutzalizacion equals <br />or exceeds that of acid pcoduht ion. <br />Tethniquee for predicting the acidic nature of <br />drainage from mine vaeces have been class if led ae <br />static of kinetic (Ferguson and Erickson, 1988). <br />S tacit methods measure the tojcal theoretical <br />potent ial of [he vaete co gene rata acid and to <br />consume acid. These potent ia~le are referred Co <br />ae the acid producing paten[ ial (APP) and [ha <br />neucrallx ing potential (NP). I[ has been •ug- <br />gestad that the acid generaciing tendency of <br />miming vaetes can be pro]ec cad based on •ichar <br />81 <br />
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