Journal of Mining Engineering

Journal of Mining Engineering

sewage sludge to coating copper sulfide processing tailings to reduce the availability of metals resulting from the production of acidic drainage

Document Type : research - paper

Authors
1 Environment, Faculty of Technical Engineering, Tarbiat Modares University, Tehran.
2 Tarbiat Modares University
3 Assistant professor at Tarbiat Modares University
4 Mineral Processing, Faculty of Mining Engineering, University of Tehran, Tehran.
Abstract
Due to the development of mines and the high volume of tailings resulting from the processing of minerals, whose particle size is in the range of microns and mostly contain heavy metals exceeding the standard, and also considering that the environment is one of the pillars of the sustainable development of every society. Therefore, mineral waste management is critical to protect the environment. One of the management strategies to prevent tailings oxidation and the subsequent production of acid mine drainage (AMD) is the tailings coating method. In this research, static tests were to predict the ability to produce acidic drainage, and then a column test was to check the performance of the tailings cover in preventing oxygen penetration and, subsequently, oxidation of the tailings and the production of acidic mine drainage on the tailings sample prepared from the mine tailings dam. Sarcheshmeh, Kerman was done. According to the results of static tests, the waste sample with net acid production potential (NNP) equal to -79.42 and the ratio of acid neutralization potential (NP) to acid production potential (AP) equal to 0.27, in the category of wastes with potential Acid production was diagnosed. In the column tests, organic coating (municipal sewage sludge) with a thickness of 7.5 and 15 cm on the tailings and water added based on the amount of monthly rainfall in the Kerman region in the normal state and double the normal state to the column. The performance of the used coating was determined by measuring parameters such as pH, oxidation-reduction potential Eh, electrical conductivity (EC), and the concentration of metals in the collected sewage. Finally, the tailings with a 15 cm cover of organic matter and the amount of added water based on the amount of natural rainfall prevented oxygen penetration into the tailings. An acidic effluent with a pH close to neutral was produced. Also, the concentration of metals in the resulting effluent was reduced.
Keywords
Subjects

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Volume 19, Issue 64
Autumn 2024
Pages 65-80

  • Receive Date 06 December 2023
  • Revise Date 23 October 2024
  • Accept Date 21 November 2024