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
2014-6-1 Table 1 shows the chemical composition of a typical chromite ore sample, indicating that besides chromium and iron, aluminum, magnesium and silicon are the main
2020-8-11 leaching after mixing chromite, sodium carbonate (Na 2
2018-11-5 This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is
2014-2-1 A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers
2002-11-1 Chromite is the only commercial ore mineral of chromium. Industrially, chromium chemicals are mainly produced by NaOH fusion followed by leaching. Kromsan is the name of
Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments
2010-5-1 Key words: mechanical activation; chromite ore; leaching 1 Introduction Chromite ore is widely used in metallurgical and chemical industries for the production
2016-2-25 EXPERIMENTAL The experimental program is focused on leaching of the corroded magnesia-chromite refractory bricks from the copper refining furnace in water. The crucibles
2019-5-6 The influence of roasting temperature (960–1200 °C) and leaching agents (H 2 O, HCl, H 2 SO 4) and their concentrations on the recovery of PGMs was studied. 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
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 order to determine the potential leachability of metals contained in these tailings
Download Citation Treatability of chromite ore processing waste by leaching Developing treatment and disposal strategies and health-based clean-up standards for chromium containing wastes
The optimum process conditions of leaching treatment were found to be a temperature of 176 °C, a dichromic acid/chromite mass ratio of 0.12, and a sulfuric acid concentration of 81%.
2019-5-6 Reagents and materials. All chemicals and solvents used were of analytical reagent grade. Low density polyethylene (LDPE) bottles, Nalgene were carefully cleaned first with hot detergent, soaked in 50% HCl (Analar), HNO 3 (2.0 mol L −1), subsequently washed with dilute HNO 3 (0.5 mol L −1) and finally rinsed with distilled water.LDPE bottles were used for leaching experiments of the
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
2015-3-4 The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a
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
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
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.
2018-11-5 This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the lime-based process in China, the world's largest chromite processor.
Download Citation Treatability of chromite ore processing waste by leaching Developing treatment and disposal strategies and health-based clean-up standards for chromium containing wastes
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
The optimum process conditions of leaching treatment were found to be a temperature of 176 °C, a dichromic acid/chromite mass ratio of 0.12, and a sulfuric acid concentration of 81%.
2015-3-4 The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a
Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr(VI) from chromite ore
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
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.
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
2018-8-15 Magnesia–chromite refractory has been extensively used in the copper-making industry. It is necessary to understand the degradation mechanisms of the current refractory to develop new refractories.