Treatment of Copper-Containing Acid Mine Drainage by Neutralization-Adsorption Process Using Calcite as Neutralizer and Polyhydroxamic Acid Resin as Adsorbent

2012 ◽  
Vol 161 ◽  
pp. 200-204 ◽  
Author(s):  
Shuai Wang ◽  
Gang Zhao ◽  
Zhong Nan Wang ◽  
Qian Zhang ◽  
Hong Zhong
Keyword(s):  
Sulfuric Acid ◽  
Acid Mine Drainage ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Adsorption Process ◽  
Mine Drainage ◽  
Acid Mine ◽  
Adsorption Capacities ◽  
Adsorption And Desorption Performance ◽  
Almost All

Acid solution and copper-containing acid mine drainage (AMD) was treated by neutralization-adsorption process. The results showed that pH can be adjusted to 4.0 by adding 10g·L-1calcite in acid solution with pH=1.0. Adsorption and desorption performance of poly(hydroxamic acid) (PHA) resin for Cu2+and Fe3+ions were investigated by column tests. The results showed that adsorption capacities of PHA for Cu2+and Fe3+ions were satisfying, and the metals adsorbed on PHA can be eluted by sulfuric acid solution effectively. AMD of Dexing copper mine of Jiangxi was treated as a sample. The results showed that 1.5g·L-1calcite can remove almost all of the Fe3+ion, and Cu2+ion can be removed by PHA and then be eluted by sulfuric acid solution with adsorption ratio of 98.95% and elution ratio of 98.50%, separately.

scholarly journals Recent developments in materials used for the removal of metal ions from acid mine drainage

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Tebogo M. Mokgehle ◽  
Nikita T. Tavengwa
Keyword(s):  
Heavy Metal ◽  
Surface Water ◽  
Acid Mine Drainage ◽  
Metal Ions ◽  
Mine Drainage ◽  
Acid Mine ◽  
Adsorption Capacities ◽  
Ion Imprinted ◽  
Wide Range ◽  
Ion Imprinted Polymers

AbstractAcid mine drainage is the reaction of surface water with sub-surface water located on sulfur bearing rocks, resulting in sulfuric acid. These highly acidic conditions result in leaching of non-biodegradeable heavy metals from rock which then accumulate in flora, posing a significant environmental hazard. Hence, reliable, cost effective remediation techniques are continuously sought after by researchers. A range of materials were examined as adsorbents in the extraction of heavy metal ions from acid mine drainage (AMD). However, these materials generally have moderate to poor adsorption capacities. To address this problem, researchers have recently turned to nano-sized materials to enhance the surface area of the adsorbent when in contact with the heavy metal solution. Lately, there have been developments in studying the surface chemistry of nano-engineered materials during adsorption, which involved alterations in the physical and chemical make-up of nanomaterials. The resultant surface engineered nanomaterials have been proven to show rapid adsorption rates and remarkable adsorption capacities for removal of a wide range of heavy metal contaminants in AMD compared to the unmodified nanomaterials. A brief overview of zeolites as adsorbents and the developent of nanosorbents to modernly applied magnetic sorbents and ion imprinted polymers will be discussed. This work provides researchers with thorough insight into the adsorption mechanism and performance of nanosorbents, and finds common ground between the past, present and future of these versatile materials.

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.

scholarly journals Mesoporous Poly(melamine-co-formaldehyde) Particles for Efficient and Selective Phosphate and Sulfate Removal

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6615
Author(s):  
Konstantin B. L. Borchert ◽  
Christine Steinbach ◽  
Berthold Reis ◽  
Niklas Gerlach ◽  
Philipp Zimmermann ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Selective Adsorption ◽  
Mineral Resources ◽  
Hybrid Particles ◽  
Aquatic Life ◽  
Acid Mine ◽  
Surface Areas ◽  
Sulfate Removal ◽  
Adsorption Capacities

Due to the existence-threatening risk to aquatic life and entire ecosystems, the removal of oxyanions such as sulfate and phosphate from anthropogenic wastewaters, such as municipal effluents and acid mine drainage, is inevitable. Furthermore, phosphorus is an indispensable resource for worldwide plant fertilization, which cannot be replaced by any other substance. This raises phosphate to one of the most important mineral resources worldwide. Thus, efficient recovery of phosphate is essential for ecosystems and the economy. To face the harsh acidic conditions, such as for acid mine drainage, an adsorber material with a high chemical resistivity is beneficial. Poly(melamine-co-formaldehyde) (PMF) sustains these conditions whilst its very high amount of nitrogen functionalities (up to 53.7 wt.%) act as efficient adsorption sides. To increase adsorption capacities, PMF was synthesized in the form of mesoporous particles using a hard-templating approach yielding specific surface areas up to 409 m2/g. Different amounts of silica nanospheres were utilized as template and evaluated for the adsorption of sulfate and phosphate ions. The adsorption isotherms were validated by the Langmuir model. Due to their properties, the PMF particles possessed outperforming maximum adsorption capacities of 341 and 251 mg/g for phosphate and sulfate, respectively. Furthermore, selective adsorption of sulfate from mixed solutions of phosphate and sulfate was found for silica/PMF hybrid particles.

scholarly journals Sulfuric acid recovery from acid mine drainage by means of electrodialysis

Desalination ◽  
2014 ◽  
Vol 343 ◽  
pp. 120-127 ◽  
Author(s):  
M.C. Martí-Calatayud ◽  
D.C. Buzzi ◽  
M. García-Gabaldón ◽  
E. Ortega ◽  
A.M. Bernardes ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Acid Mine ◽  
Acid Recovery

URANIUM AND MOLYBDENUM LEACHING FROM THE ORE OF "VOSTOK" DEPOSIT

2019 ◽  
Vol 4 (1) ◽  
pp. 92-99
Author(s):  
K.K. Valiyev ◽  
◽  
A.U. Bugubayeva ◽  
A.B. Amandykova ◽  
A.G. Bulaev ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Ammonium Persulfate ◽  
Ferric Sulfate ◽  
Metal Extraction ◽  
Acid Solutions ◽  
Acid Mine ◽  
Oxidative Leaching ◽  
Sulfuric Acid Solutions

Agitation leaching of uranium and molybdenum from the ore of “Vostok” deposit (Kazahstan) containing 0.285 % of uranium and 0.035 % of molybdenum was performed. Sulfuric acid solutions (of 1 to 3 %) as well as solutions containing oxidants, ferric sulfate and ammonium persulfate, were used as leach solutions. Also, the sample of acid mine drainage collected at “Vostok” deposit containing ferric iron ions and cells of acidophilic microorganisms was used for the leaching. Leaching with sulfuric acid solutions made it possible to leach no more than 19.4 and 24.4% of uranium and molybdenum, respectively. Oxidants allowed to increase extraction of metals. The leaching with ferric sulfate made it possible to extract up to 68 and 28.2 % of uranium and molybdenum, respectively. The leaching with ammonium persulfate made it possible up to 95.2 and 34.8 % of uranium and molybdenum, respectively. High extent of metal extraction was reached when using the sample of acid mine drainage: 95 % of uranium and 48.6 % of molybdenum were extracted. Thus, it was shown that acid mine drainage, which are formed due to complex biogeochemical processes in ore dumps and during ore dressing wastes storage may be successfully used as leach solutions for oxidative leaching of metals from uranium ores.

scholarly journals Removal of Pb(II) from Acid Mine Drainage with Bentonite-Steel Slag Composite Particles

2019 ◽  
Vol 11 (16) ◽  
pp. 4476 ◽  
Author(s):  
Xinhui Zhan ◽  
Liping Xiao ◽  
Bing Liang
Keyword(s):  
Acid Mine Drainage ◽  
Liquid Film ◽  
Adsorption Process ◽  
Mine Drainage ◽  
Diffusion Rate ◽  
Steel Slag ◽  
Composite Particles ◽  
Particle Diffusion ◽  
Film Diffusion ◽  
Acid Mine

Abandoned lead and zinc (Pb-Zn) mines around the world produce large amounts of acid mine drainage (AMD) containing Pb(II), which is toxic and accumulates in the environment and in living organisms. Bentonite-steel slag composite particles (BSC) are a new type of acid mine drainage (AMD) treatment material that can remove heavy metal ions and reduce acidity. To date, there have been no reports on the treatment of Pb(II)-containing AMD using BSC. Therefore, the effects of pH, reaction time, temperature, and Pb(II) concentration on the adsorption of Pb(II) onto BSC were studied. Moreover, the BSC before and after the reaction, as well as the precipitation after the reaction, were characterized by scanning electron microscopy and X-ray diffraction analyses. The effect of pH on the adsorption process is similar to that of the formation of soluble and insoluble hydrolysates of Pb(II) on pH. The adsorption mechanism includes ion exchange, complexation, precipitation, and synergistic adsorption–coagulation effect. Adsorption kinetics are best-fit with the pseudo-second order kinetics model ( R 2 > 0.98). Furthermore, the total adsorption rate is controlled by liquid film diffusion and in-particle diffusion, the liquid film diffusion rate being higher than the in-particle diffusion rate. The isothermal adsorption of Pb(II) onto BSC fit well with Langmuir and Brunauer Emmett Teller (BET) isotherms ( R 2 > 0.995), and both single layer adsorption and local multilayer adsorption were observed. Thermodynamic analysis revealed that the adsorption process is spontaneous and endothermic, and that the degree of freedom increases with time. In summary, this study provides a theoretical basis for the use of BSC in treating AMD containing Pb(II).

Experimental and model studies on comparison of As(III and V) removal from synthetic acid mine drainage by bone char

2014 ◽  
Vol 78 (1) ◽  
pp. 73-89 ◽  
Author(s):  
Jing Liu ◽  
Xi Huang ◽  
Juan Liu ◽  
Weiqing Wang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Cost ◽  
Arsenic Species ◽  
Breakthrough Curves ◽  
Filling Material ◽  
Bone Char ◽  
Acid Mine ◽  
Adsorption Capacities ◽  
Adsorption Cycle

AbstractAcid mine drainage (AMD) commonly contains elevated concentrations of As(III) and/or As(V) due to oxidation of arsenic-containing sulfides. Bone char has been used as a low-cost filling material for passive treatment. The breakthrough curves of As(III) and As(V) were studied in column experiments conducted at different flow rates, adsorption cycle times, and with different coexisting cations and anions to compare their transport behaviours. The experimental data were fitted by the Convection- Diffusion Equation (CDE) and Thomas model with the aim of obtaining retardation factors of As(III) and As(V) and their maximum adsorption capacities, respectively. The maximum adsorption capacities of As(III) and As(V) are 0.214 and 0.335 mg/g, respectively. Coexisting Mn2+ and Al3+ ions can shorten the equilibrium time of As(V) adsorption from 25 h to 8 h, but they have little effect on As(III). The retardation factors of As(III) and As(V) calculated by the CDE model decrease with adsorption cycles from 37 to 20 and 51 to 32, respectively. The Mn2+ and Al3+ ions could enhance retention ability with adsorption cycle time, especially Mn2+ for As(V). Secondary adsorption phenomena were observed only in breakthrough curves of As(V) in the presence of Mn2+ and Al3+. The competitive influences of coexisting arsenic species is As(V) > As(III). Regeneration experiments using distilled water and NaOH solution were completed to quantify the degree of desorption of both As(III) and As(V). The results show that As(V) adsorbed on bone char has better desorption performance than As(III), and the average degrees of desorption of As(III) and As(V) for three desorption experiments are 75% and 31%, respectively.

scholarly journals The Fe (II) and Mn (II) adsorption in acid mine drainage using various granular sizes of activated carbon and temperatures

2021 ◽  
Vol 882 (1) ◽  
pp. 012065
Author(s):  
Suliestyah ◽  
Pancanita Novi Hartamai ◽  
Indah Permata Sari ◽  
Edwardo Alexander
Keyword(s):  
Activated Carbon ◽  
Acid Mine Drainage ◽  
Adsorption Process ◽  
Mine Drainage ◽  
Atomic Absorption Spectrophotometry ◽  
Carbon Surface ◽  
Acid Mine ◽  
Bet Method ◽  
Fe And Mn ◽  
Mn Concentrations

Abstract Acid mine drainage (AMD) from coal mining activities contains Fe and Mn concentrations that often exceed environmental quality requirements. This study aims to determine the effect of the coal material size and temperature on the adsorption process of Fe and Mn metals contained in AMD using activated carbon made with a composition of 60% coal and 40% ZnCl2. For characterizing activated carbon, surface morphological was analyzed using SEM method, and surface area was analyzed using BET method. Meanwhile, for measuring Fe and Mn concentrations, the researchers used atomic absorption spectrophotometry. The adsorption process was carried out with various granular sizes of activated carbon (20, 28, 35, 48 and 60 mesh) and temperature (25, 35, 40, 45 and 50°C). The results showed that the maximum adsorption of Fe was 100% occurred in the treatment with an activated carbon size of 60 mesh and a temperature of 45°C, while the maximum adsorption of Mn was 11.91% in the treatment with an activated carbon size of 60 mesh and a temperature of 50°C. Furthermore, the activated carbon of coal is highly effective as an adsorbent for Fe in AMD waste but less effective for Mn.

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