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Mineral processing residue stored in a disposal area is required to be fully remediated using best techniques of rehabilitation, revegetation and landscaping post closure. Mineral processing residue can exhibit several properties inhibitory to plant growth and ecosystem development. Developing ...

A pilot-scale treatment study was implemented at a deposition site of chromite ore processing residue (COPR) in New Jersey. Ferrous sulfate heptahydrate (FeSO4·7H2O) was employed to reduce hexavalent chromium in two dosages with three types of soil mixing equipment. XANES analyses of treated samples cured for 240 days indicated that all treatment combinations failed to meet the Cr(VI ...

Silver processing, preparation of the ore for use in various products. Silver has long been valued for its white metallic lustre, its ability to be readily worked, and its resistance to the corrosive effects of moisture and oxygen. The lustre of the pure metal is due to its electron configuration,

amounts of 226 Ra and 230 Th than do the K-65 residues. An important feature of the K-65 residues is that the concentration of 226 Ra in them is much higher than the concentration of 226 Ra in what are classified as "uranium mill tailings" from processing of typical uranium ores from the United States. For example, the uranium concentration in the original Belgium Congo ores from which the ...

Conversion of Chromium Ore Processing Residue to Chrome Steel Introduction Chromium played an important role in the industrial development of New Jersey from 1905 to 1971. During that period, chromate (Cr6+) was produced from chromite ore at three facilities in Hudson County, NJ.

What is the abbreviation for Chromite Ore Processing Residue? What does COPR stand for? COPR abbreviation stands for Chromite Ore Processing Residue.

Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and bichromate chemical manufacturing.

Abstract The processing of gold bearing sulphide minerals which contain arsenopyrite and other complex arsenic sulphide minerals results in arsenic containing emissions and effluents which must be given careful consideration in relation to clean air and clean water standards. The sources of arsenic and the various process options for treating arsenical gold ores and concentrates are briefly ...

Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was banned in several countries, its legacy still exists at numerous contaminated sites. For instance, New Jersey alone has over 2 million tons of waste COPR.

Sep 11, 2017· Electrokinetics (EK) was investigated as a possible technique for in-situ treatment of leachable chromium at a built site contaminated with chromium ore processing residues (COPR). A preliminary EK experiment was carried out at the laboratory scale on an undisturbed COPR core sample.

A Brief Summary of Zinc Oxide Processing Methods Available for the Bongará Deposit ... Oxidized zinc ore The Waelz process has been was initially developed to process zinc oxidized ore containing between 15 and 30% ... process zinc containing residues from hydro metallurgical smelters.

Feb 26, 2013· Read "Biotreatment of chromite ore processing residue by Pannonibacter phragmitetus BB, Environmental Science and Pollution Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Abstract. Chromite ore processing residues (COPR) is the source of the Cr(VI) contamination in the environment. Pannonibacter phragmitetus BB was used to treat two different types of COPRs in this research. The water-soluble Cr(VI) of COPR A and B is 3,982.9 and 1,181.4 mg/kg, respectively.

But that's not all. The disaster resulted in claims for billions of dollars in compensation and damaged the image of an entire industry. This report reviews the situation of dam safety in mining industry retention basins and shows what alternatives are available for the disposal of ore processing residues.

Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and bichromate chemical manufacturing. At least 15% of the sites contain total chromium concentrations greater ...

The pyrolysis treatment with biomass is a promising technology for the remediation of chromite-ore-processing residue (COPR). However, the mechanism of this process is still unclear. In this study, the behavior of pyrolysis reduction of Cr(VI) by cellulose, the main component of biomass, was elucidated. The results showed that the volatile fraction (VF) of cellulose, ie. gas and tar, was ...

Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.

Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) …

TRANSPORTATION RESEARCH RECORD 1460 53 Evaluation of Bridges Constructed in Chromite Ore Processing Residue RANDALL W. POSTON, A. RHE1:T WHITLOCK, CHRISTOPHER L. GALITZ, AND KEITH E. KESNER A field investigation was conducted to assess the structural and dura­

Jun 10, 2015· The chromium sites are properties along Route 440 where chromium chemical products were made and chromium ore processing residue was disposed between about 1895 and 1954.

chromite ore processing residues in glasgow, uk: environmental impact and remediation of ground waters A METHOD OF DETERMINING AN APPROXIMATE VALUE OF THE CRITICAL LOADS AT WHICH LATERAL BUCKLING OCCURS IN RIGIDLY JOINTED TRUSSES.

The residue is pumped into land based ponds where naturally impervious layers or sealants minimise seepage. The residue is typically deposited as a dilute slurry, with the solids settling and consolidating over time and the surface water collected for return to the refining process.

Chromite ore processing residue (COPR) is a waste byproduct of chromate . overview of the different methods for addressing Cr(VI). Contact US Some studies on recovery of chromium from chromite ore . This work reports a methodology for near complete mobilization and recovery of chromium from chromite ore processing residues. It has been found ...

PDF | This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through ...

1. Introduction. Chromite ore processing residue (COPR) is an industrial solid waste .It has been reported that 2–3 t of COPR is generated in the production of 1 t chromic salts .Accumulation of COPR takes up considerable land, and when the leached hexavalent chromium flows into the water after rainfall, it pollutes the water and the soil and harms human health,,, .

Read "Rehabilitation of a uranium-ore processing residues storage site at Le Bouchet, Paris Region, France, Environment International" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Bauxite tailings, also known as red mud, red sludge, bauxite residue, or alumina refinery residues (ARR), is a highly alkaline waste product composed mainly of iron oxide that is generated in the industrial production of alumina (aluminium oxide, the principal raw material used in the manufacture of aluminium metal and also widely used in the manufacture of ceramics, abrasives and refractories).

The reduction of chrome bearing ores in the production of industrial grade chromium compounds results in a waste rich in metals contamination. This byproduct is variously referred to as chromite ore processing residue, chrome ore processing residual or chrome tailings; for the purposes of MDE reports these variants are referenced as COPR.

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