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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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<br />SOLID PHASE CHARACTERIZATION <br />of rinse vat er van added to the upper eactian. <br />Af tar the water rose into cha standpipe, it vas <br />drawn through the aolida, glaa^ fiber filter, <br />pleat is place, a 0.45 edcron l11111po re filter, <br />and into a receiving flank under a vacuum of 4 <br />Snchee (10.2 cm) mercury. - <br />the rinse water, or drainage, va9 analyzed <br />for specific conductance, pH, alkal inicy, <br />acidity, copper, ^1cke1, cobalt, zinc, iron, <br />calcium, and sulfate. The volume of rinse <br />water, spec if lc conduccanca, pH, alkalinity, <br />and/or ac idlty were determined weekly, and <br />su if ace vas analyz nd biweekly. trace metals <br />(Cu, Ni, Co, Zn), Fe, Ca, end Hg ve re analyzed <br />biweekly for the first 20 weeks and monthly <br />sub sequen[ly. <br />Analys le <br />The sulfuC content of [he rock vat determined <br />by LECO furnace and the neutrallzat Sort potential <br />vas determined by the method of Sobek e[ al. <br />(1978). For aqueous solutions, epecif is conduc- <br />tance vat analyzed ua ing a Nyron L conductivity <br />mace r, while either a Aad Lometer 29 or an Orion <br />SA 720 meter vat used for pH analy se e. Alkali- <br />nity and acidity were analyzed using standard <br />techniques for endpoints of 4.5 and B.J, <br />re spectlvely (APNA et al., 1975). He[ale were <br />analyzed with a Perkin Elmer 603 atomic absorp- <br />tion apectrophotomete r. Sulfate vat analyzed <br />using [he barium sulfate Curb ldlme [ric technique <br />(APHA et al., 1915). <br />to <br />9 /~~ <br />x f <br />e. <br />g 1 <br />150 <br />l00 <br />.~ <br />e <br />50 <br />7hna 4wslkd <br />S3 <br />Figure 1, pH, and gulf ace, calcium and magmas i,m <br />concentrations vs. time Eor weeks L <br />through 20. <br />RESULTS AND DISCUSSION <br />During the characterization of mining vaatee, <br />some vae[ea may be ldentlf ied ae acid producing <br />based on an extreme excess of iron sulfide <br />content relative co buffering mineral content. <br />Similarly vastee devoid of iron sulfide or with <br />an extreme excess of buffering mineral content <br />over Sron sulfide content can be lden[lf lab le as <br />non-acid producing. Other ac Sd producers may be <br />Sden[if ied based on acidic drainage generated <br />during the experimental time frame of klnecit <br />caste. wastes which produce alkaline drainage <br />during the kinetic [e9te may have produced <br />acidic drainage attar the buf faring minerals <br />ve re depleted in a Lomger experiment. <br />The results of 20 wanks of kinetic testing <br />provide such an example. Over [his period the <br />drainage pH vat in the range of 1.8 co 9.5. The <br />excessively high pH Le due [o the presence of <br />some lime (Ca0) in [he RK fines. In experiments <br />conducted with mixtures of lime scone and rock, <br />Eev values exceeded pH 9.0. She concentrations <br />uF sulfate and calcium in the initial rinse (t <br />0) were l70 and 360 mg/L, re spectlvely. During <br />[he initial four veaka these concentrations <br />decreased, suggesting they were products of <br />oxidac ion during storage prior co the experi- <br />ment. From week 5 [0 20 [bey were typically <br />more stable in a lover concentration range <br />(figure 1). Based on the pH data over this <br />period alone, this solid would not b• elaeslf ied <br />as an acid produtar. <br />To determine the potential for each solids to <br />produce acid drainage it Se okceeeary [o quantify <br />the times required to deplet ai the acid producing <br />iron sulf Ides and the ac Sd nedtrallz ing carbonate <br />minerals. Calculac ion of these times requires <br />the Snlt iel cons en[ of cheat ^inarala in [ha <br />vaete and the rates at which Rhay ere depleted <br />(f. e., the recta of acid production and acid <br />consumption). The iron eulf Sjde content van <br />calculated based on the sulfur and trace metal <br />contence in con]unet ion with Itha knowledge that <br />virtually all sulfur in this rock 1a present ea <br />sulf Ides (1. e., no sulfates). Shia calculation <br />Ind icated cha presence of 46 mi111molae of Sulfur <br />in the AK fines rock mizture. <br />The carbonate mineral content vas calculated <br />based on an ad]ustment to th• analyzed neutrali- <br />zation potential. The method of Sobek ec al. <br />(1918) vas used co determine the nautraliz anon <br />potential. The strong acid deed Sn this method <br />may dissolve minerals which ould not consume <br />acid under conditions typlca~ of environmental <br />dLsso lut ion (Lu[vick, 1986). Tha neutralizac ion <br />potential determined by chit method may also be <br />overeat imatad dun to contribatdans from metal <br />hydroxides vhieh precipitate during the beck <br />titration (Fe rgueon and Erickson, 1988). <br />o ~ s lu is au o <br />
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