scholarly journals Acid neutralizing capacity minerals in Barani Pit PT Agincourt Resources Martabe, North Sumatera: alternative agent on neutralizing acid mine drainage

2020 ◽  
Vol 202 ◽  
pp. 02008
Author(s):  
Rinal Khaidar Ali ◽  
Lestari Butar-butar ◽  
Nurakhmi Qadaryati ◽  
Narulita Santi
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Environmental Pollutants ◽  
Acid Neutralizing Capacity ◽  
Geological Condition ◽  
Bearing Material ◽  
Acid Mine ◽  
Rock Formations ◽  
Neutralizing Capacity ◽  
Alternative Agent

Acid Mine Drainage (AMD) is produced when sulfide-bearing material is exposed to oxygen and water. The mine may accelerate this natural reaction due to the wide and rapid exposure of sulfide minerals. Although economical ores are considered environmental pollutants, there are several elements that act as acid neutralizing capacity (ANC) mineral are associated with the ore, especially silicate minerals. Currently, PT Agincourt Resources Martabe has only relying on the use of carbonates mineral groups to handle the AMD issue. In fact, the geological condition in this area is formed of typically alumina-rich and alkaline minerals which are capable to neutralize the AMD as well. The aim of this study is to determine ANC minerals from the rock formations that has impact to neutralize the AMD in Barani Pit. The methods are geological field observation, mineral determination using spectral analysis, and assay analysis that provides data to sort the recommended ANC minerals. The ANC minerals from the rock formations and wastes within Barani Pit, other than calcite, are muscovite, illite, smectite, kaolinite, dickite and gypsum. The knowledge about these alternative ANC minerals might give contribution to reduce and solve the risk of acid mine drainage polluting the environment.

New microbiological strategies that enable the selective recovery and recycling of metals from acid mine drainage and mine process waters

2012 ◽  
Vol 76 (7) ◽  
pp. 2683-2692 ◽  
Author(s):  
I. Ňancucheo ◽  
S. Hedrich ◽  
D. B. Johnson
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Environmental Pollutants ◽  
Microbial Oxidation ◽  
Mine Waters ◽  
Acid Mine ◽  
Acidophilic Bacteria ◽  
Active Chemical ◽  
Valuable Metals ◽  
Commercial Value

AbstractApproaches currently used for remediating acid mine drainage (chiefly active chemical treatment and passive bioremediation systems) have a number of major detractions, including their failure to recover potentially valuable metals from these waters. Bioremediation strategies that utilize reactor-housed microorganisms can circumvent this problem, but have tended not to be widely used due to their relatively high costs. We have devised innovative approaches for remediating mine waters that use acidophilic bacteria to remove metals either as oxidized or reduced phases, using modular bioreactors that are designed to operate at minimal cost and to generate products that have commercial value. A composite system is described that combines microbial oxidation of ferrous iron with abiotic precipitation of ferric iron as schwertmannite, a mineral that has commercial value as an absorbent of arsenate and other environmental pollutants, and as a pigment. Sulfidogenic bioreactors maintained at acidic pH values are used to selectively precipitate metal sulfides, such as CuS. Tests with synthetic mine drainage containing mixtures of soluble metals confirmed that these systems can generate relatively pure mineral deposits from complex acid waters. The units are designed to be configured differently, according to the nature of the mine water requiring treatment.

scholarly journals Selective Removal of As(V) Ions from Acid Mine Drainage Using Polymer Inclusion Membranes

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 909
Author(s):  
Iwona Zawierucha ◽  
Anna Nowik-Zajac ◽  
Grzegorz Malina
Keyword(s):  
Acid Mine Drainage ◽  
Toxic Metals ◽  
Arsenic Removal ◽  
Mine Drainage ◽  
Environmental Pollutants ◽  
Sulfuric Acid Concentration ◽  
Toxic Metal ◽  
Cellulose Triacetate ◽  
Selective Removal ◽  
Acid Mine

Acid mine drainage (AMD) is globally recognized as one of the environmental pollutants of the priority concern due to high concentrations of toxic metals and sulfates. More rigorous environmental legislation requires exploitation of effective technologies to remove toxic metals from contaminated streams. In view of high selectivity, effectiveness, durability, and low energy demands, the separation of toxic metal ions using immobilized membranes with admixed extractants could ameliorate water quality. Cellulose triacetate based polymer inclusion membranes (PIMs), with extractant and plasticizer, were studied for their ability to transport of As(V) ions from synthetic aqueous leachates. The effects of the type and concentration of extractant, plasticizer content, and sulfuric acid concentration in source phase on the arsenic removal efficiency have been assessed. Under the best of applied conditions, PIM with Cyanex 921 as extractant and o-nitrophenyl octyl ether (o-NPOE) as plasticizer showed high repeatability and excellent transport activity for selective removal of As(V) from AMD.

scholarly journals Identifikasi Batuan PAF, NAF dan UNCERTAIN dengan Menggunakan Metode NTAPP Pada Area PT. Trubaindo Coal Mining, Melak-Kalimantan Timur

2020 ◽  
Vol 7 (2) ◽  
pp. 120-126
Author(s):  
Alfian Irviansyah ◽  
Saibun Sitorus ◽  
Aman Sentosa Panggabean
Keyword(s):  
Acid Mine Drainage ◽  
Coal Mining ◽  
Mine Drainage ◽  
Ph Value ◽  
Acid Neutralizing Capacity ◽  
Total Sulfur ◽  
Testing Methods ◽  
Neutralizing Capacity ◽  
Sulfur Level ◽  
Actual Acidity

The research about identification of PAF, NAF and uncertain rock using NTAPP method in the PT. Trubaindo Coal Mining has been done. This research was conducted as an effort to control the potential for the formation of acid mine drainage, with identifying the types of mine rocks using certain testing methods. Some important parameters such as Total Sulfur Level, Slurry pH, Total Actual Acidity (TAA), Chromium Reducible Sulfur (CRS) and Acid Neutralizing Capacity (ANC) using the NTAPP method on mine rocks have been determined to identify mining rock category categories. Based on the results of tests on 101 samples, 63 samples were identified included in the category of rocks that are not NAF (Slurry pH value = 4.1 - 8.9; Total Sulfur = 0.01-0.60 %; CRS = 0.01-0.10 % and NTAPP = 0.030-0.959 %), 38 samples were classified as PAF (pH Slurry = 2.9-7.9; Total Sulfur = 0.01-5.10 %; CRS = 0.11-2.04 % and NTAPP = 0.053-4.571 %), and no sample was included in the uncertainty category. 

scholarly journals The application of coal discards for acid mine drainage neutralization

2020 ◽  
Vol 120 (9) ◽  
Author(s):  
S. Mxinwa ◽  
E.D. Deenanath ◽  
S.W. Robertson ◽  
S. Ndlovu ◽  
P. Basson
Keyword(s):  
Acid Mine Drainage ◽  
South African ◽  
Coal Mine ◽  
Mine Drainage ◽  
Operating Costs ◽  
Capital Costs ◽  
Acid Mine ◽  
Neutralizing Capacity ◽  
Potential Precursor ◽  
Waste Coal

SYNOPSIS The neutralization of acid mine drainage (AMD) with coal discards in percolating columns was investigated as a potential precursor to lime neutralization. The neutralizing capacity of three coal samples, A (70% ash), B (25.3% ash), and C (28.9% ash, estimated), sourced from three South African coal mines, was determined at different crush sizes (-40 mm, -12.5 mm and -6.3 mm). AMD solution obtained from another local coal mine was percolated over the coal samples packed in 1 m and 6 m columns, until the pH of the accumulated drainage solution measured approximately pH 7. Samples B and C, with an alkalinity content equivalent to 2.3% CaCO3, achieved neutralizing capacities of 2112 L AMD and 929 L AMD per ton coal respectively, at a -6.3 mm crush size. Sample A, with an alkalinity content equivalent to 0.48% CaCO3, neutralized only 282 L AMD per ton coal at the same crush size. An economic analysis was performed to compare neutralization with waste coal against lime neutralization in tanks. The analysis was based on a rate of AMD generation of 1750 m3/d, a neutralizing capacity of 1.4 m3 AMD per ton coal, with capital costs estimated at R18 million for lime neutralization and R27.6 million for coal neutralization. Operating costs were estimated at R24 million for lime neutralization and R9 million for coal neutralization. AMD neutralization with suitable waste coal may therefore be less expensive than neutralization with lime. Keywords: acid mine drainage, neutralization, waste coal.

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