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DOI: https://doi.org/10.4491/eer.2017.104
Stabilization and solidification of tailings from a traditional gold mine using Portland cement
Ranno Marlany Rachman, Ayi Syaeful Bahri, and Yulinah Trihadiningrum
Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
Corresponding Author: Ranno Marlany Rachman ,Tel: +62-8114007575, Fax: +62-315928387, Email: ranno_2004@yahoo.com
Received: August 10, 2017;  Accepted: January 26, 2018.
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The traditional gold mining in Kulon Progo district, Special Region of Yogyakarta Province produced tailings containing mercury (Hg) from the gold amalgamation process. Mercury accumulated in tailings has 164.19 mg/kg - 383.21 mg/kg in total concentration. Stabilization/solidification (S/S) is one of the remediation technologies to reduce waste pollution. Portland cement is one of the additive materials in S/S that effective encapsulates heavy metal waste. The aim of this research is to know the optimum composition of tailings mixture with Portland cement in S/S process. This research used variation of tailings composition. Variation of Portland cement composition with tailing are 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 and 10:90. The result of this study found that the optimum composition of Portland cement: tailings was 10:90, with compression test of 257 ton/m2 and TCLP test was 0.0069 mg/L. The compression test results were in accordance to US EPA Standard quality of 35 ton/m2. TCLP test results meet the standard of Indonesian Government Regulation No. 101 Year 2014 of 0.05 mg/L.
Keywords: Mercury | Portland cement | Stabilization/solidification | Tailings
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