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In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript.It was found out that the
In order to simplify the cleaner chromate salts production technology, the pressure leaching process of chromite ore in 50 wt% KOH solution was systemically
In the sulfuric acid leaching process for chromite, a strong oxidizing environment is maintained by the presence of oxidant and the employment of
A clean and efficient leaching process for chromite ore Gang Chena,b, Xiaohui Wanga, Hao Dua, Ying Zhanga, Jiajun Wangc, Shili Zhenga,⇑, Yi Zhanga a
In industry, chromite is firstly converted to chromate solution (such as Na 2 CrO 4 or K 2 CrO 4 ) by soda ash roasting and leaching. Then, the chromate is
The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally
The reaction between chromite and sulphuric acid was studied in the temperature range 140 210oc. The leaching time varied from 2 to 6 hours and the
This is due to the fact that COPR mineralogy differs depending on (a) chromite ore composition, (b) the extraction process (especially the complexing agent),
A novel reduction reaction for extracting Cr 2 O 3 from chromite ores is demonstrated by excluding the formation of carcinogenic chromate (Cr 6+)
Batch leaching tests, qualitative and quantitative xray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching
The leaching kinetics study indicated that the leaching process of chromium was controlled by the surface chemical reaction between the chromite ore processing residue and sulfuric acid. Overall, the direct acidic leaching process could not achieve high leaching efficiency and resulting in a large amount of impurities which was
Vardar et al. determined that the apparent activation energy for the leaching of chromite in sulfuric acid at atmospheric pressure is 77 kJ·mol −1 in the presence of perchlorate. Shi et al. [52,53] used
Peiyang Shi Email: [email protected]. The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave
Sulfuric acidbased leaching is a promising cleaner method to produce chromium salts, but its feasibility for treating low Fe(II)chromite still remains to be proven. A Box–Behnken design (BBD)based set of experiments for sulfuric acid leaching of low Fe(II)chromite was utilized in this work for generating an experimental dataset for revealing the functional
The above analysis and testing of the leaching residue reveal that the leaching residue is chromite with higher grade, better crystal form and lower impurity content. Liu J, Hu GR, Du K et al (2014) Influencing factors and kinetics analysis of a new clean leaching process for producing chromate from Cr–Fe alloy. J Clean Prod
The results indicated that CuO played an important role in improving the chromium leaching rate. The leaching rate reached 98% after leaching for 6 h when CuO was applied, whereas it was only 60.8
As reported in the study in our research on the influencing factors and kinetics of the leaching process, the leaching rate of chromium is over 97% at a reaction temperature of 90°C, liquidtosolid ratio of 3 : 1, and leaching time of 6 h (Liu et al., 2014). 3.2. Precipitation of Iron from Chromium Leaching Solution with Oxalic Acid
Batch leaching tests, qualitative and quantitative xray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr (VI) from chromite ore processing residue (COPR) samples obtained from an urban area in Hudson County, New Jersey. The pH of the leaching solutions was
Chromite is a mineral whose main components are oxides of iron, magnesium and chromium: (Fe, Mg)Cr2O4, a type of spinel.For the processing of chrome ore, there are various methods such as gravity
The pressurized leaching process set forth in the paper produced an undiluted leaching solution. This was conducive to the precipitation of BrCO 4 using a Ba (OH) 2 transformation process. Chromium separation efficiency was 98%. At a reaction temperature of 80 o C, the chromium conversion efficiency was 96%. The reaction time
Abstract 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 limebased process in China, the world's largest chromite processor. Results indicated that, while soda ash COPR had 8,500 mg/kg
Peiyang Shi Email: [email protected]. The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave
The above analysis and testing of the leaching residue reveal that the leaching residue is chromite with higher grade, better crystal form and lower impurity content. Liu J, Hu GR, Du K et al (2014) Influencing factors and kinetics analysis of a new clean leaching process for producing chromate from Cr–Fe alloy. J Clean Prod
Leaching kinetics of acidsoluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigat The leaching process of acidsoluble Cr(VI) from COPR is controlled by the diffusion through the product layer. The apparent activation energy is 8.696 kJ/mol and the reaction orders
The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing
Sulfuric acidbased leaching is a promising cleaner method to produce chromium salts, but its feasibility for treating low Fe(II)chromite still remains to be proven. A Box–Behnken design (BBD)based set of experiments for sulfuric acid leaching of low Fe(II)chromite was utilized in this work for generating an experimental dataset for revealing the functional
The leaching of Cr for chromite tailings can be explained by two main processes. The first main process for Cr leaching is associated with the presence of phosphate anions in solution, which can exchange
Chromite ore processing residue (COPR), derived from the socalled high lime processing of chromite ore, contains high levels of Cr(III) and Cr(VI) and has a pH between 11 and 12. Ferrous sulfate, which is used for remediation of Cr(VI) contamination in wastewater and soils via reduction to Cr(III) and subsequent precipitation of iron(III)/chromium(III)
DOI: 10.1016/J.PSEP..10.002 Corpus ID: 103740543; Recovery of chromium from residue of sulfuric acid leaching of chromite @article{ZhaoRecoveryOC, title={Recovery of chromium from residue of sulfuric acid leaching of chromite}, author={Qingjie Zhao and Chengjun Liu and Baokuan Li and Ron Zevenhoven and Henrik Sax{\'e}n and Maofa
Batch leaching tests, qualitative and quantitative xray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr (VI) from chromite ore processing residue (COPR) samples obtained from an urban area in Hudson County, New Jersey. The pH of the leaching solutions was
