scholarly journals Acid Mine Drainage Dynamics from a Paste Tailing Deposit: Effect of Sulfate Content on the Consistency and Chemical Stability after Storage

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 860
Author(s):  
Eduardo Leiva ◽  
María Cayazzo ◽  
Luis Dávila ◽  
Mario Torres ◽  
Christian Ledezma
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Critical Factor ◽  
Compression Tests ◽  
Acid Mine ◽  
Chemical Factors ◽  
Sulfate Salts ◽  
The Stability ◽  
Over Time

Surface paste tailings’ disposal has emerged recently as an optimal and efficient method to favor tailings’ self-containment after being deposited into dams. This disposal method can improve the reuse of water and reduce the generation of acid mine drainage (AMD) and the release of leachates (e.g., acid and heavy metals). However, the implications of chemical factors or mixed-water chemistry in the stability of paste tailings over time are not clear. In this work, we evaluated the release of sulfate from tailing samples and the role of sulfate as a critical factor in the tailings’ strength, consistency, and stability. Our results showed that the release of acid runoff with high sulfate load from the tailings is negligible. Leaching tests were performed for 180 days and did not show a significant release of sulfate, heavy metals, or acid waters. However, the presence of sulfate salts derived from the binders used in the pretreatment of the paste tailings shows an impact on the tailings’ consistency. Undrained triaxial monotonic compression tests revealed low effective cohesion forces in the tailings samples. In addition, it was observed that, in tailings slurries prepared with varying concentrations of sulfate (0, 500, and 1000 mg/L), the slump test value dropped Δ−55% when the sulfate concentration increased from 0 to 1000 mg/L. These results support the idea that the presence of sulfate within the tailings could be relevant for the paste consistency after storage. This knowledge will contribute to a better understanding of the critical chemical factors that affect the stability of paste tailings over time.

Mechanisms and Remediation Technologies of Sulfate Removal from Acid Mine Drainage

2012 ◽  
Vol 610-613 ◽  
pp. 3252-3256
Author(s):  
Mei Qin Chen ◽  
Feng Ji Wu
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Metal Corrosion ◽  
Sulfate Ion ◽  
High Concentration ◽  
Biological Reduction ◽  
Acid Mine ◽  
Sulfate Removal ◽  
Co Precipitation

Acid mine drainage (AMD) has properties of extreme acidification, quantities of sulfate and elevated levels of soluble heavy metals. It was a widespread environmental problem that caused adverse effects to the qualities of ground water and surface water. In the past decades, most of investigations were focused on the heavy metals as their toxicities for human and animals. As another main constitution of AMD, sulfate ion is nontoxic, yet high concentration of sulfate ion can cause many problems such as soil acidification, metal corrosion and health problems. More attention should be paid on the sulfate ion when people focus on the AMD. In the paper, sulfate removal mechanisms include adsorption, precipitation, co-precipitation and biological reduction were analyzed and summarized. Meanwhile, the remediation technologies, especially the applications of them in China were also presented and discussed.

Magnetic natural composite Fe3O4-chitosan@bentonite for removal of heavy metals from acid mine drainage

2019 ◽  
Vol 538 ◽  
pp. 132-141 ◽  
Author(s):  
Guorui Feng ◽  
Jianchao Ma ◽  
Xiaopeng Zhang ◽  
Qingfang Zhang ◽  
Yuqiang Xiao ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Acid Mine ◽  
Removal Of Heavy Metals ◽  
Natural Composite

Chemical precipitation of heavy metals from acid mine drainage

2002 ◽  
Vol 36 (19) ◽  
pp. 4757-4764 ◽  
Author(s):  
Matthew M Matlock ◽  
Brock S Howerton ◽  
David A Atwood
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Chemical Precipitation ◽  
Acid Mine

scholarly journals Distribution and mobilization of heavy metals at an acid mine drainage affected region in South China, a post-remediation study

2020 ◽  
Vol 724 ◽  
pp. 138122 ◽  
Author(s):  
Chen Luo ◽  
Joyanto Routh ◽  
Mårten Dario ◽  
Soumyajit Sarkar ◽  
Lezhang Wei ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
South China ◽  
Mine Drainage ◽  
Acid Mine

scholarly journals Enhanced Monovalent Cation Biomineralization Ability by Quartz Sand for Effective Removal of Soluble Iron in Simulated Acid Mine Drainage

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 732
Author(s):  
Heru Wang ◽  
Mengying Li ◽  
Yongwei Song
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Removal Efficiency ◽  
Quartz Sand ◽  
Mine Drainage ◽  
Monovalent Cation ◽  
Iron Minerals ◽  
Precipitation Efficiency ◽  
Acid Mine ◽  
Effective Removal

Acid mine drainage (AMD) is characterized by low pH, high soluble Fe, and heavy metal concentrations. Conventional lime neutralization produces large amounts of Fe(OH)2 and Fe(OH)3, which complicate subsequent disposal. Secondary iron minerals synthesized by biomineralization can reduce the concentration of soluble Fe in addition to adsorbing and removing heavy metals in AMD. Therefore, an appropriate method for improving the precipitation efficiency of Fe is urgently needed for AMD treatment. Using simulated AMD, this work analyzes the influence of quartz sand (40 g/L) on the Fe2+ oxidation and total Fe deposition efficiencies, as well as the phases of secondary iron minerals in an Acidithiobacillus ferrooxidans system including K+, Na+, or NH4+ (53.3 mmol/L). Quartz sand had no significant effect on Fe2+ oxidation and 160 mmol/L Fe2+ was completely oxidized by A. ferrooxidans in 168 h, but contributed to the oxidized product (Fe3+) mineralization, improving the total Fe removal efficiency in simulated AMD. Compared with treatments involving K+ or Na+ alone, quartz sand improved the total Fe precipitation efficiency by 26.6% or 30.2%, respectively. X-ray diffraction showed that quartz sand can promote the transformation of the biomineralization pathway from schwertmannite to jarosite with higher yields, which is important for improving the removal efficiency of heavy metals in AMD.

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