Comparing the performance of low‐grade nickel ore and limestone for treatment of synthetic acid mine drainage

2020 ◽  
Vol 15 (3) ◽  
Author(s):  
Casey Oliver A. Turingan ◽  
Divina Joyce A. Fabella ◽  
Kim Ahmed N. Sadol ◽  
Arnel B. Beltran ◽  
Richard D. Alorro ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Grade ◽  
Acid Mine ◽  
Synthetic Acid

Treatment of synthetic acid mine drainage using rice wine waste as a carbon source

2013 ◽  
Vol 71 (10) ◽  
pp. 4603-4609 ◽  
Author(s):  
Gyoung-Man Kim ◽  
Dae-Hoon Kim ◽  
Jung-Seock Kang ◽  
Hwanjo Baek
Keyword(s):  
Carbon Source ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Rice Wine ◽  
Acid Mine ◽  
Synthetic Acid

Uranium Bioleaching from Low Grade Ore

2020 ◽  
Vol 989 ◽  
pp. 559-563
Author(s):  
Ashimkhan T. Kanayev ◽  
Khussain Valiyev ◽  
Aleksandr Bulaev
Keyword(s):  
Sulfuric Acid ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Leach Solution ◽  
Low Grade ◽  
Bacterial Cells ◽  
Acid Mine

The goal of the present work was to perform bioleaching of uranium from low grade ore from Vostok deposit (Republic of Kazakhstan), which was previously subjected to long-term acid leaching. The ore initially contained from 0.15 to 0.20% of uranium in the form of uraninite, but ore samples used in the study contained about 0.05% of uranium, as it was exhausted during acid leaching, and uranium was partially leached. Representative samples of ore were processed in 1 m columns, leach solutions containing 5, 10, 20 g/L of sulfuric acid and bacterial cells (about 104) were percolated through the ore. Leaching was performed at ambient temperature for 70 days. In one of the percolators, the leaching was performed with leaching solution containing 10 g/L of H2SO4, cells of A. ferrooxidans, and 0.5 g/L of formaldehyde. Leaching with the solution containing 5, 10, and 20 g/L of sulfuric acid made it possible to extract 50, 53, and 58% of uranium. Addition of formaldehyde in leach solution led to the decrease in uranium extraction extent down to 37%. Thus, the results of the present work demonstrated that uranium ore exhausted during long-term acid leaching may be successfully subjected to bioleaching, that allows extracting residual quantities of uranium. Leaching rate of uranium from exhausted ore depended on both sulfuric acid concentration and microbial activity of bacteria isolated from acid mine drainage, formed on uranium deposit. In the same time, acid mine drainage may be used as a source of inoculate, to start bioleaching process.

Effects of Hydraulic Retention Time, COD/SO42− Ratio, Influent Iron Concentration, and Sulfate Kinetics on Treatment of a Synthetic Acid Mine Drainage

2020 ◽  
Vol 39 (4) ◽  
pp. 851-858
Author(s):  
Marina Isabel Vianna de Oliveira Ribeiro ◽  
Juliana Kawanishi Braga ◽  
Renata Piacentini Rodriguez ◽  
Giselle Patricia Sancinetti
Keyword(s):  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Iron Concentration ◽  
Acid Mine ◽  
Synthetic Acid

Iron precipitation kinetics in synthetic acid mine drainage

1999 ◽  
Vol 18 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Harry R. Diz ◽  
John T. Novak ◽  
J. Donald Rimstidt
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Precipitation Kinetics ◽  
Iron Precipitation ◽  
Acid Mine ◽  
Synthetic Acid

Preliminary Study of Neutralization and Inhibition of Chemolitotrophic Bacteria in an Acid Mine Drainage from Rio Tinto Site

2009 ◽  
Vol 71-73 ◽  
pp. 677-680 ◽  
Author(s):  
D. Carnicero ◽  
E. Díaz ◽  
O. Escolano ◽  
D. Rubinos ◽  
O. Ballesteros ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Red Mud ◽  
Mine Drainage ◽  
Initial Conditions ◽  
Microbial Populations ◽  
Low Grade ◽  
Neutralization Capacity ◽  
Acid Mine ◽  
Rio Tinto ◽  
Río Tinto

Limestone is commonly used for neutralization of acid mine drainage (AMD). Its main advantages are its lower price, sustained generation of alkalinity and production of low sludge volumes. Nevertheless, armouring of limestone by ferric hydroxides is a problem in oxic limestone drains and in active limestone treatment systems, reducing the efficiency of the process. Due to these disadvantages, there is a permanent search for cheaper and more effective neutralization agents. Many alkaline industrial wastes are gaining importance in the treatment of AMD. The possibilities to use two different industrial by-products, red mud from a bauxite exploitation and low grade magnesium hydroxide from a magnesite mine, as neutralizing and bacterial inhibiting agents, and the comparison with conventional limestone treatment has been studied in this paper. An AMD from Rio Tinto mine site with an initial pH of 2.4 and a ferric concentration of 1 g/L was used. Comparative test were done percolating the AMD in a continuous form with a peristaltic pump through three different columns filled with limestone, red mud and low grade magnesite, during one month and in same conditions of flow rate and amount of each compound used to fill the columns. The evolution of pH, iron and heavy metals, sulphates and microbial populations in the percolate were monitored at different times. The results showed that the best neutralization capacity was obtained with low grade magnesite during the month treatment. By contraire limestone and red mud loosed their neutralization capacity after 10 and 13 days respectively. The control of microbial populations showed that there is an inhibition of chemolithotropic bacteria as long as the materials maintain their neutralization capacity, reverting to the initial conditions when this capacity was loosed.

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