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REP19319
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REP19319
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Entry Properties
Last modified
8/24/2016 11:48:03 PM
Creation date
11/27/2007 2:37:51 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Report
Doc Date
5/11/1990
Doc Name
FINAL TAILINGS HUMIDITY CELL TEST RESULTS
From
BATTLE MOUNTAIN GOLD CO
To
MLRD
Media Type
D
Archive
No
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• ~~~~~ <br />Ws~ter'n Atls~ <br />InCernetionel <br />COF~E~BORATORIES <br />HUMIDITY CELL TESTING <br />INTRODUCTION <br />Analytical tests used to predict the formation of acid mine <br />drainage fall into two categories. Static tests measure the amount <br />of acid-producing material and acid-consuming material present in <br />the sample. Kinetic testing attempts to simulate the acid- <br />produCing and acid-consuming processes which occur in the natural <br />environment. Humidity cell testing is a kinetic test. Results <br />obtained from static tests are relatively simple to interpret but <br />may not be representative of the naturally occurring chemical <br />reactions. Kinetic tests, including humidity cell testing, are a <br />more realistic model of the reactions occurring in the natural <br />environment but analytical results are often more difficult to <br />interpret. <br />SAMPLE PREPARATION <br />Samples are air-dried at room temperature for 24 hours or until a <br />stable weight is obtained. Air-dried samples are then crushed to <br />minus 10 mesh (2 mm) using a disk pulverizer and thoroughly <br />blended. Air-dried, crushed samples are stored in plastic bags <br />until analysis. <br />TEST APPARATUS <br />Humidity test cells are plastic containers with tight-fitting <br />lids. Each cell is 2.75 inches high and 7 inches square. An <br />air inlet feeds into the center of the top lid and a drain fitting <br />is located in the bottom corner of each cell (see Figure 1). A <br />series of twelve individual humidity cells is connected to a <br />regulated source of compressed air using equal lengths of 0.5 inch <br />diameter Tygon tubing. Humidified air is generated using a 6.5 <br />gallon glass carboy which is half-filled with deionized water. <br />This carboy is equipped with Tygon tubing connected to two <br />dispersion air-stones. Compressed air can be fed directly to the <br />humidity cells (dry air cycle) or pumped through the carboy first <br />an3 then routed to the humidity cells (humidified air cycle). <br />Humidity cells are placed on wire racks during testing. Sample <br />leachates are collected using glass beakers located beneath the <br />drain fitting of each cell (see Figure 1). <br />Tq fNhAf DDS^~0^f a.^rfr~/flflpnf CO^NSr10 ~r T'] rfOpi Yf WfIO upon DOf~^rfnDrf Ertl ^41M9r fu0d~p Dr 7M CnM1 b MEM UDWyv~ ND COrfMrgY~ uff m0 gpOr~ nil pNn mb~ ip <br />rrfrp~lil~Mf Jr ODD^'Or3 PD'fffW'IpQ1^IM DH'iYOQOmMrd Gpf LlWq~O^q Cdl UDOrflygf iflVrryf^0'~f00nLprnYfM rY.O rowYrY+r M•~dHMIInD^f Pplff Y'^DnM H <br />10 A•f GOOUCinrtv yDDf! DDV U'Onf Or pDlnfpYfL bwnu U fnv p~ QO :DYY Ofnlr m~ryp raofm •fu a YM m CTn~DMr ~~T wnrDn mcn r~ppf ~1 uff0 a rP+O u0D^ rb f W 'fffan <br />.rNYMvf, <br />
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