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<br />Project: Cripple Creek Hydrogeochemistry Date: 4/8/2008
<br />Task: Neutralization of Pyrite Oxidation Products Page 1-5
<br />Test 2: Neutralization by Laboratory Calcium Carbonate
<br />Each HCT_test liquor shall be subjected to the following test:
<br />1. Take a 500 gram sample of the powdered laboratory calcium carbonate reagent and place it in an inert tumbler.
<br />2. Add 500 mL of the HCT test liquor (leaving 1,950 mL).
<br />3. Roll the sample and liquor for 24 hours.
<br />_ 4. Decant liquid from sample container and filter using a 0.45 micron glass filter.
<br />_5. Anal
<br />- yze the resulting liquid for pH, conductivity, ORP, sulfate, acidity, alkalinity, TDS, Cl, N03-N, HCO3, Al, Sb, As, Ba, Be, Bi, B,
<br />] Cd, Ca, Cr, Co, Cu, Fe, Pb, Li, Mg, Mn, Hg, Mo, Ni, P04, K, Se, SiO2, Ag, Na, Sr, Te, TI, Th, Sri, Ti, U, V, Zn, Zr.
<br /> I I I I I I I I I
<br />Test 3: Neutralization by Calcium Hydroxide
<br />Each HCT test liquor shall be subjected to the following test:
<br />1. Take 500 mL of the HCT_test liquor (leaving 1,450 mL), and place in a 1 liter beaker, with a magnetic stirrer and pH monitoring
<br />electrode. Measure the starting pH.
<br />2. Heat the stirred test liquor to 200C. Measure the pH.
<br />3. Titrate the stirred sample with 0.05 N calcium hydroxide reagent, recording quantity to reach each even 0.5 pH unit (i.e. 4.0, 4.5, 5.0 ..).
<br />Terminate test at pH 7.5. Record any precipitate, gas evolution, or color change.
<br />4. Decant _liquid from sample container and filter using a 0.45 micron glass filter.
<br />_5_Analyze the resulting liquid for pH, conductivity, ORP, sulfate, acidity, alkalinity, TDS, Cl, N03-N, HCO3, Al, Sb, As, Ba, Be, Bi, B,
<br />Cd, Ca, Cr, Co, Cu, Fe, Pb, Li, Mg, Mn, Hg, Mo, Ni, P04, K, Se, SiO2, Ag, Na, Sr, Te, TI, Th, Sri, Ti, U, V, Zn, Zr.
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<br />Test 4: Neutralization by Sodium Hydroxide
<br />Each HCT test liquor shall be subjected to the following test:
<br />1. Take 500 mL of the HCT test liquor (leaving 950 mL), and place in a 1 liter beaker, with a magnetic stirrer and pH monitoring electrode.
<br />Measure the starting pH. --
<br />2. Heat the stirred test liquor to 201C. Measure the pH.
<br />3. Titrate the stirred sample with 0.1 N sodium hydroxide reagent, recording quantity to reach each even 0.5 pH unit (i.e. 4.0, 4.5, 5.0...)
<br />Terminate test at pH 7.5. Record any precipitate, gas evolution, or color change.
<br />4. Decant liquid from sample container and filter using a 0.45 micron glass filter.
<br />5. Analyze the resulting liquid for pH, conductivity, ORP, sulfate, acidity, alkalinity, TDS, Cl, N03-N, HCO3, Al, Sb, As, Ba, Be, Bi, B,
<br />Cd, Ca, Cr, Co, Cu, Fe, Pb, Li, Mg, Mn, Hg, Mo, Na, Ni, P04, K, Se, SiO2, Ag, Na, Sr, Te, TI, Th, Sri, Ti, U, V, Zn, Zr.
<br />Adrian Brown Consultants, Inc.
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