Fehér Béla (szerk.): Az ásványok vonzásában, Tanulmányok a 60 éves Szakáll Sándor tiszteletére (Miskolc, 2014)
Móricz Ferenc - Mádai Ferenc - Walder Ingar F.: Szulfidos bányászati meddőkben lezajló piritoxidáció időbeni változása
Temporal changes of pyrite oxidation in sulphidic mine wastes 183 3. Analytical part and results Column tests provide information to characterize the pyrite oxidation rate. Additionally analytical methods were used for determination of the individual mineral phases and mineral alterations, such as X-ray powder diffraction (XRPD) was used for pyrite content analysis and scanning electron-microscopy and electron probe microanalyses (SEM + EPMA) for the definition of mineralogical composition and texture properties. As it was already mentioned in the Theoretical part, the pyrite oxidation rate was determined by the pH value, based on equation (1) and (2). As a simple example, Fig. 1 shows the pH values of the seepage water from the column test in the case of Bol 2 flotation tailing sample. Each year column test started with an up-running part, caused by the effect of the first flushes, where the secondary minerals, accumulated during the dry period were dissolved and washed out. After this quickly changing period, the pH has been stabilized, the stable pH refers to the pyrite oxidation. This pH changes tendency is well represented Fig. 1. The pH changes of the sample Bol 2 during the investigation period. 1. ábra. A pH-érték változása a Bol 2-es minta csurgalékvizében. 5 I Q> Z V) <0 ^ O 1 5 2 i ° * c S i'E a f 140 120 100 80 60 40 20 0 Bol 1, 2 and 3 1Í3.4 type "A” f type "C" 54.0 type "B" t 43.4 40.3 41 3 T ____I____ ■ 75^r ■ ■ _ M- , M ■ year 2 □ year 3 Bol 1 (TA) Bol 2 (TA) Bol 3 (TA) Fig. 2. Changes of the pyrite oxidation rate in samples Bol 1, 2 and 3. 2. ábra. A piritoxidáció mértékének változása a Bol 1, 2 és 3 mintákban.
