Environment and Interdisciplinary Development

Chemical Stabilization of Zinc Tailings via Additives of Lime, Red Mud, Cement and GGBFS

Document Type : Original Article

Authors

Ravanbakhsh Shirdam 1
Sara Emami 2
Somayeh Mohammadi 1

1 Research Group of Environmental Engineering, Research Center for Environment and Sustainable Development (RCESD), Department of Environment, Tehran, Iran.

2 Department of Human Environment, Faculty of Environment, Karaj, Iran.

https://doi.org/10.22034/envj.2022.341859.1207
Abstract
To reduce the solubility of nickel, cadmium, lead, zinc and cobalt of filter cake tailings, resulting from zinc processing, a sample of the mentioned tailings was collected from the accumulation site in Zanjan province. Their chemical properties were measured using XRF and XRD analysis. Then, these tailings were mixed with 0-10%, 0-3%, 0-2% and 0-6% of lime, red mud, cement and GGBFS, respectively, as stabilizers. In order to investigate the reduction of solubility of heavy metals, the extraction process of the samples was performed using 0.05 M EDTA solution, and the heavy metal of these extracts were measured by atomic absorption. The results demonstrate that in samples made with a combination of both lime and red mud, the solubility of all heavy metals except lead was reduced by 45 to 50%. A comparison between the XRD spectra of the control sample and that of the stabilized sample shows that the sulfate form of PbSO4 in the control sample has converted to the carbonate form of PbCO3 in the sample containing lime and red mud, which has more solubility. This change was the main factor in increasing the solubility of lead (87%) in these samples. Cement and slag have been the most effective additives in reducing lead solubility in filter cake. According to the XRD spectrum, the form of PbSO4 in the control sample decreased significantly (100%) after being mixed with cement and slag, which was the reason for the maximum reduction of the solubility of extractable lead in the sample.

Keywords

Tailings
Leach Filter Cake
Chemical Stabilization
Heavy Metal
Solubility

Subjects

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Environment and Interdisciplinary Development
Volume 6, Issue 74
Winter 2022
Pages 106-120

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