chromite leaching chemicals
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chromite leaching chemicals

Acid leaching of chromite - ScienceDirect

1994-5-1 · An alternative method for the production of chromium chemicals is leaching the chromite ore in alkali or acidic media. Direct pressure leaching of chromite using sodium hydroxide (NaOH) was studied by Farrow and Burkin [2] at a temperature range of 190- 270 . It is reported that as chromium ions are removed from the surface layers of solid ...

Sulfuric acid leaching of Turkish chromite concentrate ...

2002-11-1 · In this research work the sulfuric acid leaching of a typical Turkish chromite concentrate was studied. The following was concluded considering the experimental results: 1. In the absence of perchloric acid, the maximum chromium extraction was about 58% under the conditions of 175 °C, 70 vol% H 2 SO 4 (81.4 wt.%) and 2 h.

Leaching of Valuable Elements from the Waste Chromite

2020-8-11 · the chromite spinel structure (magnesiochromite) and the surface chemical reaction of the spinel may control the leaching process. However, aluminum mainly exists in MgFeAlO 4, and its leaching is much easier, and at temper-atures of 373, 383, 393, and 403 K, the R2 value of model 1−2/ 3X − (1 − X)2/3 is greater than that of the model 1 ...

Physical Chemistry of Roasting and Leaching Reactions for ...

The natural resource of chromium is the chromite ore, which is a spinel (Fe 2+, Mg)[Cr,Al,Fe 3+] 2 O 4, and is often present with gangue minerals such silicates. Traditionally chromium chemical extraction has been carried out with alkali and CaO roasting, which led to major environmental issues due to CaCrO 4 /Na 2 CrO 4 release.

(PDF) Leaching Mechanisms of Cr(VI) from Chromite Ore ...

Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching

(Bio)leaching Behavior of Chromite Tailings

Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments were

LEACHABILITY OF CHROME FROM MAGNESIA

2016-2-25 · Keywords: Environment, Corrosion, Magnesia-chromite refractory, Alkali leaching The interactions of magnesia-chromite refractory brick with Cu-Na 2 O·2SiO 2 and CuO-Na 2 O·2SiO 2 melts are studied and the chemical durability of corrosion products in water is evaluated. The corrosion tests confirm intensive infiltration of the

(Bio)leaching Behavior of Chromite Tailings

Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments were

Preventing Chromium Leaching

2018-8-19 · Leaching and Oxidation Resistance of MgO·Cr2O3. Fixing of Chromium. This report presents the results of research aimed at evaluating and preventing the

(PDF) Can chromite weathering be a source of Cr in soils?

This preferential leaching of Mg and Al from chromite that would leave a Fe/ Cr-rich residue upon weathering has previously been proposed to explain the occurrence of two populations of chromite ...

Leaching of Valuable Elements from the Waste Chromite

The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from ...

(PDF) Sulfuric acid leaching of Turkish chromite ...

Leaching of chromite with sulfuric acid only by weight. The reaction between a simple chromite and sulfuric 4.1.2. Effect of temperature acid is given as (Gupta and Mukherjee, 1990), Fig. 2 shows a plot for the extraction of chromium as Cr2 O3 FeO þ 4H2 SO4 !

Leaching of Valuable Elements from the Waste Chromite

2020-8-11 · the chromite spinel structure (magnesiochromite) and the surface chemical reaction of the spinel may control the leaching process. However, aluminum mainly exists in MgFeAlO 4, and its leaching is much easier, and at temper-atures of 373, 383, 393, and 403 K, the R2 value of model 1−2/ 3X − (1 − X)2/3 is greater than that of the model 1 ...

Leaching of hexavalent chromium from young chromite

2020-3-18 · Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.

Caustic Leaching of Montana Chromite

2019-8-13 · Montana Tech Library Digital Commons @ Montana Tech Bachelors Theses and Reports, 1928 - 1970 Student Scholarship 5-17-1949 Caustic Leaching of Montana Chromite

(Bio)leaching Behavior of Chromite Tailings

Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments were carried out in batch reactors with Acidithiobacillus thiooxidans or Pseudomonas putida in

Leaching of hexavalent chromium from young chromite

2020-6-19 · Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences,

LEACHABILITY OF CHROME FROM MAGNESIA

2016-2-25 · Keywords: Environment, Corrosion, Magnesia-chromite refractory, Alkali leaching The interactions of magnesia-chromite refractory brick with Cu-Na 2 O·2SiO 2 and CuO-Na 2 O·2SiO 2 melts are studied and the chemical durability of corrosion products in water is evaluated. The corrosion tests confirm intensive infiltration of the

(Bio)leaching Behavior of Chromite Tailings

2021-11-8 · minerals Article (Bio)leaching Behavior of Chromite Tailings Viviana Bolaños-Benítez 1,2,3, Eric D. van Hullebusch 2,3,*, Piet N.L. Lens 3, Cécile Quantin 4, Jack van de Vossenberg 3, Sankaran Subramanian 5 and Yann Sivry 1 1 Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, UMR 7154, CNRS, F-75005 Paris, France; [email protected]

Use of Selected Industrial Waste Materials in Concrete

2010-7-23 · Commercially, chromite ore is processed to produce sodium chromite and other chromium chemicals such as sodium chromite, chromic acid, and chromium sul-phate. Chromium leaching from deposited sites is of high environmental relevance associated with the contamination of natural resources with toxic hexava-lent chromium Cr61. In the environment ...

Leaching of Valuable Elements from the Waste Chromite

2020-8-11 · the chromite spinel structure (magnesiochromite) and the surface chemical reaction of the spinel may control the leaching process. However, aluminum mainly exists in MgFeAlO 4, and its leaching is much easier, and at temper-atures of 373, 383, 393, and 403 K, the R2 value of model 1−2/ 3X − (1 − X)2/3 is greater than that of the model 1 ...

Leaching of hexavalent chromium from young chromite

2020-6-19 · Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences,

Caustic Leaching of Montana Chromite

2019-8-13 · Montana Tech Library Digital Commons @ Montana Tech Bachelors Theses and Reports, 1928 - 1970 Student Scholarship 5-17-1949 Caustic Leaching of Montana Chromite

Leaching of Valuable Elements from the Waste Chromite ...

2020-8-11 · The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from the waste COPR was investigated. X-ray diffraction (XRD ...

Hot Filtration: A Way to Enhance the Recovery of

TurkishJ.Eng.Env.Sci. 30(2006),375–380. c TUB¨ ITAK˙ Hot Filtration: A Way to Enhance the Recovery of Chromite in Sulfuric Acid Leaching, with or without the Addition of Perchloric

(Bio)leaching Behavior of Chromite Tailings

2021-11-8 · minerals Article (Bio)leaching Behavior of Chromite Tailings Viviana Bolaños-Benítez 1,2,3, Eric D. van Hullebusch 2,3,*, Piet N.L. Lens 3, Cécile Quantin 4, Jack van de Vossenberg 3, Sankaran Subramanian 5 and Yann Sivry 1 1 Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, UMR 7154, CNRS, F-75005 Paris, France; [email protected]

Use of Selected Industrial Waste Materials in Concrete

2010-7-23 · Commercially, chromite ore is processed to produce sodium chromite and other chromium chemicals such as sodium chromite, chromic acid, and chromium sul-phate. Chromium leaching from deposited sites is of high environmental relevance associated with the contamination of natural resources with toxic hexava-lent chromium Cr61. In the environment ...

Chromite—A cost-effective refractory raw material for ...

2011-3-3 · Of these oxides, chrome in the form of chromite is the most cost effective. Depending on its chemical composition each type of refractory material will be more compatible with certain chemical and physical environments than with others Refractories are also classified according to their form: 1. Shaped refractories—essentially bricks 2.

Rapid Analysis of Chromite and Chrome Ore

2010-8-6 · chemical work, however, continued practice of this convention can be misleading. For example, expressing the result of an analysis for A12O3 in chromite as 29.84 percent implies that the analyst is confident of his result to better than 1 part in 1,000. This would be presump­

Extraction of Chromium from Chromite Ore

2017-7-20 · The average grade of the metallurgical chromite ore was 43.4 pct Cr2O3, with 52 pct of the ore having a chromium-to-iron ratio of 3:1 or over, 17.6 pct having a ratio between 2:1 and 3:1, and 30.4 pct having a ratio less than 2:1. Chemical-grade

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