Modifications to EPA Method 3060A to Improve Extraction of Cr(VI) from Chromium Ore Processing Residue-Contaminated Soils

2017 ◽  
Vol 51 (19) ◽  
pp. 11235-11243 ◽  
Author(s):  
Christopher T. Mills ◽  
Carleton R. Bern ◽  
Ruth E. Wolf ◽  
Andrea L. Foster ◽  
Jean M. Morrison ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Chromium Ore ◽  
Ore Processing

scholarly journals Complete Reduction of Hazardous Cr(VI) in Chromium Ore Processing Residue Dump Site

2018 ◽  
Vol 30 (3) ◽  
pp. 620-624 ◽  
Author(s):  
Vanitha Murugaiyan ◽  
T. Sehar ◽  
S. Selvaraj ◽  
P. Kamatchi Selvaraj
Keyword(s):  
Dump Site ◽  
Complete Reduction ◽  
Chromium Ore ◽  
Ore Processing

Optimisation of metal extraction from chromium ore processing residue in New Jersey, USA

2018 ◽  
Vol 13 (4) ◽  
pp. 98-107
Author(s):  
Wiwat Kamolpornwijit ◽  
Jay N Meegoda ◽  
Janitha H Batagoda
Keyword(s):  
New Jersey ◽  
Metal Extraction ◽  
Chromium Ore ◽  
Ore Processing

Specific Gravity of Expansive Chromium Ore Processing Residue with Complex Microstructure

2010 ◽  
Vol 33 (4) ◽  
pp. 102836 ◽  
Author(s):  
L. D. Suits ◽  
T. C. Sheahan ◽  
Andrew M. Millspaugh ◽  
James M. Tinjum ◽  
Timothy A. Boecher
Keyword(s):  
Specific Gravity ◽  
Chromium Ore ◽  
Ore Processing

An Assessment and Quantitative Uncertainty Analysis of the Health Risks to Workers Exposed to Chromium Contaminated Soils

1991 ◽  
Vol 7 (3) ◽  
pp. 159-196 ◽  
Author(s):  
Dennis J. Paustenbach ◽  
Deborah M. Meyer ◽  
Patrick J. Sheehan ◽  
Virginia Lau
Keyword(s):  
New Jersey ◽  
Uncertainty Analysis ◽  
Health Risks ◽  
Contaminated Soils ◽  
Geometric Mean ◽  
The United States ◽  
Arithmetic Mean ◽  
Chromite Ore Processing Residue ◽  
Chromite Ore ◽  
Ore Processing

Paustenbach, Dennis J., Deborah M. Meyer, Patrick J. Shee han, and Virginia Lau (1991). An assessment and quantitative uncertainty analysis of the health risks to workers exposed to chromium contaminated soils. Toxicol. Industrial Health. Millions of tons of chromite-ore processing residue have been used as fill in various locations in Northern New Jersey and else where in the United States. The primary toxicants in the residue are trivalent chromium [ Cr(III)] and hexavalent chromium [ Cr(VI)]. The hazard posed by Cr(III) is negligible due to its low acute and chronic toxicity. In contrast, Cr(VI) is considered a inhalation human carcinogen at high concentrations. Approxi mately 40 commercial and industrial properties in Northern New Jersey have been identified as containing chromite ore processing residue in the soil. One site, a partially-paved trucking terminal, was evaluated in this assessment. The arithmetic mean and geo metric mean concentrations of total chromium in soil were 977 and 359 mg/kg, respectively. The data were log-normal distrib uted. The arithmetic mean and geometric mean concentrations of Cr(VI) in surface soil were 37.6 and 3.1 mg/kg, respectively. The data could not be fit to a standard distribution, likely due to the large number of samples with concentrations below the method detection limit (65%). Dose was calculated for each exposure route using a Monte Carlo statistical simulation.

scholarly journals Influence of pH on the solubility of arsenic in heavily contaminated soils / Wpływ pH na rozpuszczalność arsenu w glebach silnie zanieczyszczonych

2013 ◽  
Vol 24 (3) ◽  
pp. 7-11 ◽  
Author(s):  
Leszek Gersztyn ◽  
Anna Karczewska ◽  
Bernard Gałka
Keyword(s):  
Contaminated Soils ◽  
Arsenic Concentration ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Samples ◽  
Carbonate Content ◽  
Ore Processing ◽  
Initial Ph ◽  
Alkaline Conditions ◽  
The Impact

Abstract The aim of this study was to determine the impact of pH on arsenic solubility in soils heavily contaminated by the former arsenic industry. For the purpose of the study, three soil samples were collected from the area affected by ore processing in Złoty Stok. Soils differed in initial pH, calcium carbonate content, organic matter content and total arsenic concentration. The amounts of arsenic released from soils at various pH were measured using extraction tests, where soil samples were shaken with various doses of HCl and NaOH in the presence of 0.01 mol • dm−3 CaCl2 as the background solution. Arsenic solubility in soils was considerably low at neutral or slightly acidic pH and increased considerably in both strongly acidic and alkaline conditions. The importance of these effects for environmental risk was discussed.

scholarly journals Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Yu Liu ◽  
Yin Li ◽  
Yucheng Hu ◽  
Khan M. G. Mostofa ◽  
Siliang Li ◽  
...  
Keyword(s):  
Shallow Aquifer ◽  
Column Experiments ◽  
Silty Clay ◽  
Shallow Aquifers ◽  
Adsorption Characteristics ◽  
Comprehensive Management ◽  
Chromium Ore ◽  
Transport Behavior ◽  
Ore Processing ◽  
Pseudo Second Order

This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR dumpsite showed a maximum total Cr level of 9756.7 mg/kg. The concentrations of Cr(VI) in groundwater nearby the COPR dumpsite were 766.9–1347.5 mg/L. These results display that the top soils, shallow aquifers, and groundwater of the study site are severely polluted by Cr(VI). Then, three aquifers (silt, clay, and silty clay), respectively, collected from the depth of 1.4–2.4 m, 2.4–4.8 m, and 4.8–11.00 m were first used to evaluate the adsorption characteristics and transport behavior of Cr(VI) in shallow aquifers by both batch and column experiments. The adsorption of Cr(VI) on tested aquifers was well described by pseudo-second-order equation and Freundlich model. The adsorption capacities of Cr(VI) on three aquifers followed the order: clay > silty clay > silt. The kinetics proved that Cr(VI) is not easily adsorbed by the aquifer mediums but transports with groundwater. Thermodynamics indicated that Cr(VI) adsorption on tested aquifers was feasible, spontaneous, and endothermic. Cr(VI) adsorption on tested aquifers decreased with increasing pH. Furthermore, the transport of Cr(VI) in adsorption columns followed the sequence of clay < silty clay < silt. Desorption column experiments infer that the Cr(VI) adsorbed on aquifers will desorb and release into groundwater in the case of rainwater leaching. Therefore, a proper treatment of the COPR and a comprehensive management of soils are vital to prevent groundwater pollution.

Conversion of Chromium Ore Processing Residue to Chrome Steel

2008 ◽  
Author(s):  
Jay N. Meegoda ◽  
Wiwat Kamolpornwijit ◽  
Zhengbo Hu ◽  
Robert Mueller ◽  
Ravi Patraju
Keyword(s):  
Chrome Steel ◽  
Chromium Ore ◽  
Ore Processing

Chrome Steel from Chromium Ore Processing Residue

2011 ◽  
Author(s):  
Wiwat Kamolpornwijit ◽  
Jay N. Meegoda
Keyword(s):  
Chrome Steel ◽  
Chromium Ore ◽  
Ore Processing
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