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LEACHING OF OXOANION-FORMING ELEMENTS FROM MINERAL PROCESSING WASTE USING CONSTANT PH TEST
Citation:
AlAbed*, S R., P. L. Bishop, AND P. Gong. LEACHING OF OXOANION-FORMING ELEMENTS FROM MINERAL PROCESSING WASTE USING CONSTANT PH TEST.
Description:
The Toxicity Characteristic Leaching Procedure (TCLP) is currently used for determining whether wastes meet toxicity characteristic and have the potential to contaminate groundwater with a number of regulated metals. There are many science issues related to the use of TCLP as a universal test. Many of these scientific issues are especially important to Mineral processing Waste (MPW). Recent studies show TCLP may fail to extract some oxoanion-forming elements, such as arsenic, molybdenum, selenium and vanadium. The objective of this study is to compare whether amounts and types of leached metals during other leaching tests of MPW are different from the TCLP results. Results from one site that is high in arsenic (23 mg/kg), and moderately high in vanadium (5 mg/kg), cadmium (5 mg/kg), cadmium (6 mg/kg), selenium (9 mg/kg), and molybdenum (4.5 mg/Kg) will be presented. TCLP samples and waste digested samples were analyzed for Ca, Cd, Cr, Cu, Fe, Mg, Mo, Se, V, As, and Zn, using ICP-AES. Waste samples from the site were leached at pH 3, 5, 7, and 9. The pH level was kept constant at the desired pH throughout the test.