Regeneration of barium carbonate from barium sulphide in a pilot-scale bubbling column reactor and utilization for acid mine drainage

2012 ◽  
Vol 65 (2) ◽  
pp. 324-331 ◽  
Author(s):  
J. Mulopo ◽  
J. N. Zvimba ◽  
H. Swanepoel ◽  
L. T. Bologo ◽  
J. Maree
Keyword(s):  
Acid Mine Drainage ◽  
Flow Rate ◽  
Mine Drainage ◽  
Barium Carbonate ◽  
Pilot Scale ◽  
Carbonation Reaction ◽  
Column Reactor ◽  
Acid Mine ◽  
Sulphate Removal ◽  
Co2 Flow

Batch regeneration of barium carbonate (BaCO3) from barium sulphide (BaS) slurries by passing CO2 gas into a pilot-scale bubbling column reactor under ambient conditions was used to assess the technical feasibility of BaCO3 recovery in the Alkali Barium Calcium (ABC) desalination process and its use for sulphate removal from high sulphate Acid Mine Drainage (AMD). The effect of key process parameters, such as BaS slurry concentration and CO2 flow rate on the carbonation, as well as the extent of sulphate removal from AMD using the recovered BaCO3 were investigated. It was observed that the carbonation reaction rate for BaCO3 regeneration in a bubbling column reactor significantly increased with increase in carbon dioxide (CO2) flow rate whereas the BaS slurry content within the range 5–10% slurry content did not significantly affect the carbonation rate. The CO2 flow rate also had an impact on the BaCO3 morphology. The BaCO3 recovered from the pilot-scale bubbling column reactor demonstrated effective sulphate removal ability during AMD treatment compared with commercial BaCO3.

Recovery of calcium carbonate from steelmaking slag and utilization for acid mine drainage pre-treatment

2012 ◽  
Vol 65 (12) ◽  
pp. 2236-2241 ◽  
Author(s):  
J. Mulopo ◽  
M. Mashego ◽  
J. N. Zvimba
Keyword(s):  
Calcium Carbonate ◽  
Hydrochloric Acid ◽  
Acid Mine Drainage ◽  
Flow Rate ◽  
Mine Drainage ◽  
Steelmaking Slag ◽  
Carbonation Reaction ◽  
Acid Mine ◽  
Pre Treatment ◽  
Co2 Flow

The conversion of steelmaking slag (a waste product of the steelmaking process) to calcium carbonate (CaCO3) was tested using hydrochloric acid, ammonium hydroxide and carbon dioxide via a pH-swing process. Batch reactors were used to assess the technical feasibility of calcium carbonate recovery and its use for pre-treatment of acid mine drainage (AMD) from coal mines. The effects of key process parameters, such as the amount of acid (HCl/calcium molar ratio), the pH and the CO2 flow rate were considered. It was observed that calcium extraction from steelmaking slag significantly increased with an increase in the amount of hydrochloric acid. The CO2 flow rate also had a positive effect on the carbonation reaction rate but did not affect the morphology of the calcium carbonate produced for values less than 2 L/min. The CaCO3 recovered from the bench scale batch reactor demonstrated effective neutralization ability during AMD pre-treatment compared with the commercial laboratory grade CaCO3.

The use of a passive treatment system for the mitigation of acid mine drainage at the Williams Brothers Mine (California): pilot-scale study

2016 ◽  
Vol 130 ◽  
pp. 116-125 ◽  
Author(s):  
Erin J. Clyde ◽  
Pascale Champagne ◽  
Heather E. Jamieson ◽  
Caitlin Gorman ◽  
John Sourial
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Pilot Scale ◽  
Passive Treatment ◽  
Treatment System ◽  
Acid Mine

scholarly journals TEKNOLOGI PENGOLAHAN AIR ASAM TAMBANG BATUBARA “Alternatif Pemilihan Teknologi”

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Nusa Idaman Said
Keyword(s):  
Acid Mine Drainage ◽  
Flow Rate ◽  
Active Treatment ◽  
Mine Drainage ◽  
Passive Treatment ◽  
Low Flow ◽  
Active Systems ◽  
Acid Mine ◽  
Reducing Conditions ◽  
Suitable Treatment

Acid Mine Drainage (AMD) treatment systems can be broadly categorised as either active or passive systems, which differ according to their ability to handle Acidity, flow rate and Acidity Load of the influent AMD.  Most passive and active systems utilise aggregate carbonate to neutralise the pH and encourage precipitation of metals as hydroxides or sulphide minerals.  In addition, passive treatment systems often use organic matter to provide alkalinity and create reducing conditions which favour the precipitation of metal sulphides.Active treatment systems can be engineered to accommodate essentially any acidity, flow rate and acidity load. Active treatment of AMD can be achieved using fixed plants or portable equipment for in-situ treatment. Passive treatment systems are almost invariably used for post closure treatment scenarios, and are best suited to AMD with low Acidity and low flow rates. The key factors in selection and design of active and passive AMD treatment systems are water chemistry including pH, metals, sulphate levels and redox state and flow rate of influent AMD, and the objectives of AMD treatment. Other important factors include capital and operating costs, availability of suitable treatment reagents or materials and sludge management issues. Keywords: Acid Mine Drainage, Active Treatment, Passive Treatment, Coal Mining.

Treatment and recovery of iron from acid mine drainage: a pilot-scale study

2021 ◽  
pp. 106974
Author(s):  
Xin Hu ◽  
Hong Yang ◽  
Keyan Tan ◽  
Shitian Hou ◽  
Jingyi Cai ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Pilot Scale ◽  
Acid Mine

Recovery of Copper from Acid Mine Drainage by an Integrated Sulphate Reducing Process

2009 ◽  
Vol 71-73 ◽  
pp. 557-560 ◽  
Author(s):  
Bo Wei Chen ◽  
Jian Kang Wen ◽  
Xing Yu Liu
Keyword(s):  
Acid Mine Drainage ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Removal Rate ◽  
Uasb Reactor ◽  
Sulfate Reducing ◽  
Acid Mine ◽  
Sulphate Removal ◽  
High Concentrations ◽  
Treat Acid Mine Drainage

An integrated sulfate reducing process was used to treat Acid Mine Drainage with high concentrations of Cu2+, Fe and SO42-. The water treatment system integrated a sulfidogenic UASB bioreactor with a precipitation reactor which was used to recover copper. Sodium lactate was used as energy source. The effective volume of the UASB reactor was 2 L and the hydraulic retention time was 12.57h. In the sulphate removal reactor, sulphate was removed from 21160 to 195 mg/L with a rate of 4427.8 mg/L/d. Cu2+ and Fe was removed by biologically generated S2- and OH- from 360 and 6520 to 0.049 mg/L and less than 10 mg/L respectively. The average COD, copper and iron removal rate was 2523.2, 15.21 and 274.98 mg/L/d separately. The effluent pH reached 6.0-7.0. The results showed potential usage of this bioreactor in treating Acid Mine Drainage.

scholarly journals Study of sulphate ions removal from acidic waters using ion exchange resin

2018 ◽  
Vol 13 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Petra Pavlikova ◽  
Magdalena Balintova ◽  
Marian Holub
Keyword(s):  
Acid Mine Drainage ◽  
Ion Exchange ◽  
Mine Drainage ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Dynamic Conditions ◽  
Acid Mine ◽  
Sulphate Removal ◽  
Acidic Waters ◽  
Static Conditions

Abstract Acid Mine Drainage (AMD) is the most common pollution related to mining. It consists of an aqueous solution containing high metals and sulphate concentration, which impact surface and groundwater and lead to serious environmental problems. Low pH and high concentrations of heavy metals and sulphates are limiting for many various treatment technologies in these acidic waters. Ion - exchange is a very powerful technology where one or more undesirable contaminants are removed from water by exchange with another non-objectionable or less objectionable substance. Many of materials for the ion - exchange treatment is available in a variety forms and have widely differing chemical and physical properties. The paper deals with study of ion - exchange process under static and dynamic conditions for sulphate removal from acidic waters using ion - exchange resin with the aim to apply the results for treatment of acid mine drainage. Two types of experiments were performed under static and dynamic conditions. The efficiency of AMBERLITE MB20 resin for SO4 2- removal from model solution H2SO4 under static conditions decreases from 86.6 % for concentration 100 mg/L to efficiency 66.9 % for concertation 1000 mg/L. The efficiency for sulphate removal from AMD was only 41%. The study also presents three experiments under dynamic conditions, one with new ion - exchange resin a two experiments with its regenerated form. It was find that ion-exchange capacity decreases numbers of regeneration steps.

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