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以嗜酸氧化亚铁硫杆菌(Acidthiobacillus ferrooxidans,At.f,FN811931)为研究对象,研究了脉石矿物溶出阳离子(K~+,Mg~(2+),Ca~(2+)和Al~(3+))对At.f菌氧化活性的影响。研究结果表明:不同阳离子对At.f菌氧化活性的影响效应不同,其影响由大到小的顺序依次为Mg~(2+),Al~(3+),K+,Ca~(2+),当Mg~(2+),Al~(3+),K~+浓度分别超过1,5,10 g·L~(-1)时显著降低了At.f菌的氧化活性,而Ca~(2+)在所研究0~2 g·L~(-1)浓度范围内对At.f菌氧化活性影响不大。培养25 h时,低浓度条件下(0.5 g·L~(-1)),K+,Ca~(2+),Al~(3+),Mg~(2+)作用下的Fe~(2+)的氧化率分别为67.78%,68.76%,65.27%,61.28%,均高于不添加任何离子作用下的Fe~(2+)的氧化率(60.74%);高浓度条件下(15 g·L~(-1)),K+,Al~(3+),Mg~(2+)作用下的Fe~(2+)的氧化率分别为35.82%,25.25%,21.47%,均低于不添加任何离子作用下的Fe~(2+)的氧化率。阳离子Mg~(2+),Al~(3+),K~+随离子浓度的增加,Fe~(2+)的氧化率均呈现逐渐降低的趋势。
In this paper, Acidthiobacillus ferrooxidans (At.f, FN811931) was used as the research object to study the dissolution kinetics of gangue minerals such as K ~ +, Mg ~ (2 +), Ca ~ (3+)) on the oxidative activity of At.f bacteria. The results showed that different cations had different effects on the oxidative activity of At.f. The order of the effects of different cations was Mg ~ (2 +), Al ~ (3 +), K +, Ca ~ (2+) When the concentrations of Mg 2+, Al 3+ and K + were higher than 1, 5 and 10 g · L -1, the oxidative activity of At.f was significantly reduced, while Ca ~ (2+) had little effect on the oxidative activity of At.f bacteria in the concentrations of 0 ~ 2 g · L ~ (-1). After cultured for 25 h, Fe ~ (2) under the condition of 0.5 g · L ~ (-1), K +, Ca ~ (2 +), Al ~ (3 +) and Mg ~ (2+) +) Were 67.78%, 68.76%, 65.27% and 61.28%, respectively, which were all higher than that of Fe 2+ without any ions (60.74%). Under high concentration (15 g · L -1, the oxidation rates of Fe 2+ by K +, Al 3+ and Mg 2+ were 35.82%, 25.25% and 21.47% respectively, both lower than Do not add any ions under the action of Fe ~ (2) oxidation rate. With the increase of ion concentration, the oxidation rate of Fe ~ (2+) decreased gradually with the increase of Mg ~ (2 +), Al ~ (3 +) and K ~ + ions.