The removal of heavy metals from refinery effluents by sulfide precipitation

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Acta Montanistica Slovaca Pub Date : 2023-06-12 DOI:10.46544/ams.v28i1.17

Levent Kartal, A. Sen, S. Timur, Hitit Üniversitesi, M. Fakultesi, Kuzey Kampüsü Çevre, Yolu Bulvarı

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Abstract

This study investigated the selective precipitation of copper (Cu2+), nickel (Ni2+) and zinc (Zn2+) ions from industrial wastewater by using sodium sulfide (Na2S). The effects of pH, time and free sulfide concentration on the selective precipitation were systematically investigated using synthetically prepared solutions and gold refinery wastewater. First, the optimum precipitation pH values of metals, the amount of Na2S and time were determined by using synthetic solutions containing Cu, Ni and Zn single metal ions. The highest precipitation efficiencies were obtained at a pH of 4, 5.3 and 5.3 for Cu, Ni and Zn, respectively. Based on these results, the effects of Na2S stoichiometry and time of precipitation were investigated with synthetically prepared solutions containing mixed metal ions (100 mg/L Cu2+, 90 mg/L Ni2+ and 100 mg/L Zn2+). Metal sulfide precipitation efficiencies increased with increasing amounts of Na2S and reached a maximum at a ratio of 1:1.75 (Metal ion: Na2S molar ratio). Lastly, the results obtained from the experiments performed with synthetic solutions were used for the metal sulfide precipitation from industrial wastewater. The precipitation from refining wastewater containing 10 g/L Cu2+, 0.3 g/L Ni2+ and 3 g/L Zn2+ ions was achieved at pH values from 2.3 to 5.3. At a pH of 2.3, Cu2+ precipitated as CuS (Cu2S) at 100% efficiency. While the Ni2+ concentration in the solution decreased by only 44% at a pH of 2.3, the Zn2+ concentration decreased by 52%. At a pH of 5.3, Cu2+ and Zn2+ precipitated together at 100%.

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硫化物沉淀法去除炼油厂废水中的重金属

研究了用硫化钠(Na2S)选择性沉淀工业废水中的铜(Cu2+)、镍(Ni2+)和锌(Zn2+)离子。以合成溶液和金精炼厂废水为研究对象，系统考察了pH、时间和游离硫化物浓度对选择性沉淀的影响。首先，采用含Cu、Ni和Zn单金属离子的合成溶液，确定了金属的最佳沉淀pH值、Na2S的用量和时间。Cu、Ni和Zn在pH分别为4、5.3和5.3时的沉淀效率最高。在此基础上，采用混合金属离子(100 mg/L Cu2+、90 mg/L Ni2+和100 mg/L Zn2+)合成溶液，考察了Na2S化学计量学和沉淀时间的影响。金属硫化物的析出效率随着Na2S用量的增加而增加，在金属离子与Na2S摩尔比为1:1.75时达到最大值。最后，将合成溶液的实验结果应用于工业废水中金属硫化物的沉淀。在pH为2.3 ~ 5.3的条件下，对含10 g/L Cu2+、0.3 g/L Ni2+和3 g/L Zn2+离子的炼制废水进行了沉淀。在pH = 2.3时，Cu2+以100%的效率以cu (Cu2S)的形式析出。pH = 2.3时，溶液中Ni2+浓度仅下降44%，而Zn2+浓度下降52%。在pH = 5.3时，Cu2+和Zn2+以100%的速率同时析出。

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来源期刊

Acta Montanistica Slovaca 地学-地球科学综合

CiteScore

3.60

自引率

12.50%

发文量

审稿时长

30 weeks

期刊介绍： Acta Montanistica Slovaca publishes high quality articles on basic and applied research in the following fields: geology and geological survey; mining; Earth resources; underground engineering and geotechnics; mining mechanization, mining transport, deep hole drilling; ecotechnology and mineralurgy; process control, automation and applied informatics in raw materials extraction, utilization and processing; other similar fields. Acta Montanistica Slovaca is the only scientific journal of this kind in Central, Eastern and South Eastern Europe. The submitted manuscripts should contribute significantly to the international literature, even if the focus can be regional. Manuscripts should cite the extant and relevant international literature, should clearly state what the wider contribution is (e.g. a novel discovery, application of a new technique or methodology, application of an existing methodology to a new problem), and should discuss the importance of the work in the international context.