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02/25/99 15:26 S 702 356 8917 ncGlel land Lab 12 <br />• n( the waste rock. if the "fizz" rating iS moderate to strong, 4D or HO ml of O.SN HCl <br />would 6e used as excess acid for the ANP determination. if the "fiza." rating is nil to <br />slight, 20 or 40 m] of U.1N HC'1 would he used. <br />Neutralization potential (ANY) is determined by: <br />]) Placing 2.Og of -60 or -150 mesh solid sample into a 250 ml Eslenmyer tlsuk, <br />2) Carefully adding a known excess of HCl (yuantiry and normality detcntuned from <br /> "fiu" rating), <br />3) lieatiug to near boiling and swirling the Mask every 5 nduutes until reaction is <br /> complete (no visible gas evolution), <br />4) Adding Dcionizcd water to x total volume of 125 ml, <br />5) Bulling for one minute, and cooling to slightly above room temperature, then cover <br /> and Ict cool to room temperature (Uo not put a rubber stopper in the hot bask, it <br /> may implode upon cooling), <br />6) Titrating using U.1N ur O.SN NaOH (known concentration) to pH 7.U using an <br /> electromatic p1~1 meter and buret. The amcentration o(NnOH should correspond to <br /> the concentration of excess HCI used in step (2), <br />7) If less than 3m1 of NaUH is required to nhtain a pH of 7.0, it is likely tha[ the HCl <br /> added was not sufficient to neutralize all of the alkalinity present in the 2.0 gram ' <br /> solid sample. A duplicate test should [hen be conducted using the next higher <br /> volume or concentration of HCI determined from the "fizti' rating. <br />g) Run a blank fur each volume or concentration (normality) oC HCl by repeating steps " <br /> 2, 3, 4, and S. `i <br />Ca lculations are as follows: <br />1) Constant (C) _ (ml acid in hlank) + (ntl base in blank) <br />• <br />2) ml acid cnntiwned = (nd acid added) - (nil base added x C) <br />3) 'I'ons CaCU., equivalatts/IUW tons of waste ruck = (ml acid wnsumed) x (25) x <br /> (N of acid). <br />STANDARD ABA STATIC TEST METHOD <br />As mentioned earlier, the sundard ARA method usually overstates AGP because the <br />AGP is based on the total sulfur (S„ S', and SOS) content. 'I'Ite procedure is simple and <br />svaight forward. <br />I) Meesure paste pH of the pulverized solids. <br />2) Determine total sulfur content using the la:co furnace method. <br />3) Determine ANP as described earlier. <br />AGP = S,~lo x 37.25 (tons CaCO3eq/]000 tons) <br />ANP =tons CaCO~/1000 tons <br />NNP ~ ANY - A(iY (should be u positive 5 value) <br />Katio =ANP +AGP (should be '1.2 or higher) <br />• A9cCl.liI.LAND LAl3OkA7Y)KIGS. 1N('. <br />