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gg— <br /> Fresh sludge in 11 +- 3-dam(tailings-mh) <br /> In, 625a 1..1 7 t Della(sludge•rich) <br /> P -a- &riser(sludgarich) <br /> + Sdem(fallings-rich) <br /> S .1 4:1 ml 4:1 <br /> F 4:1 12 10 <br /> r <br /> e <br /> is At 4W. I. W. <br /> g <br /> IA00 al 9:1 5aaW 8:1 _ <br /> 1 12:1 6:1 6 i <br /> u <br /> I BI i.A.. B2 kl 8 <br /> I • <br /> I M 12:1 � <br /> a 51:1 num liquid:nuns sludge <br /> udnrma a each 1" 7 20 25 <br /> I:I 0 5 10 <br /> HON 6:1 <br /> Cl <br /> E41 inkVBW am Ingrid:mall sludge Fluld-sludge ratio <br /> cols a ads step <br /> Figure I. Schematic diagram illustrating the sequential batch extraction (SBE) analytical <br /> procedure used in this study to evaluate leachability. 1t <br /> + 3-darn(talBnps-rich) <br /> pH g - Delta(sludge-rich) <br /> Table I.Physical parameters and metal concentration in modified 3-dam sap water. These fluids were used - &riser(sludge-rich) <br /> as lixiviants in the SBE tests. + 5-darn(tailings-rich) <br /> 10 <br /> -------------- <br /> pH AI Ca Fe Mn Conductivity Acidity Alkalinity <br /> (s.u) (mg(L) (mg/L) (mg/L) (mg/L) (25°C) (mg(L) (mg(L) <br /> R <br /> PH 7 7.0 2.5 623 17.0 30.0 2,700 10 14 v p <br /> PH 9.1 2.9 606 17.1 3.7 2,460 <2 24 = <br /> a <br /> conductivity were determined by wet chemical methods(EPA M305.1,M310.1 and M 120.1). pH B <br /> was determined by EPA M I50.1. <br /> 3 RESULTS OF THE SEQUENTIAL BATCH EXTRACTION PROCEDURE 7 <br /> 0 5 10 15 20 25 <br /> Data from the SBEs is graphically portrayed in figures 2-7,with concentration on the ordinate(Y- <br /> "is)and fluid-sludge ratio on the abscissa(X-axis). Results will be discussed according to Fluid-sludge ratio <br /> whether the pH 7 or pH 9 lixiviant was used. <br /> 7.1 Results of Teaching with pN7/ixivianr Figure 2. Plots of pH versus fluid-sludge ratio for leachale derived from the SBE for the four <br /> Mayflower samples,using lixivissm with initial pH of 7 and 9. <br /> Leaching results with the pH 7 lixiviant clearly demonstrate the difference in behavior between <br /> samples dominated by sludge and those dominated by the underlying tailings material. Sludge-rich <br /> samples(delta and 6-riser)leached with the pH 7 water from 3-dam arc characterized by low but <br /> 658 659 <br />