roasting and leaching processess for chromium

Physical Chemistry of Roasting and Leaching Reactions for

Physical Chemistry of Roasting and Leaching Reactions for Chromium Chemical Manufacturing and Its Impact on the Environment - A Review Sergio Sanchez-Segado,

Roasting and leaching behaviors of vanadium and chromium in ...

2017.9.13 Research Article Roasting and leaching behaviors of vanadium and chromium in calcification roasting–acid leaching of high-chromium vanadium slag

Physical Chemistry of Roasting and Leaching Reactions for

2013.1.31 Chromium chemicals are produced through alkaline roasting of chromite ore with alkali salts (such as NaOH, Na 2 CO 3 , NaNO 3 or NaFeO 2 ) with or without

Physical Chemistry of Roasting and Leaching Reactions for

Summary This chapter contains sections titled: Introduction Crystal Structure of Chromite Minerals Thermal Decomposition of Chromites Alkali Roasting of Chromites Leaching

Physical Chemistry of Roasting and Leaching Reactions for

2013.1.31 Physical Chemistry of Roasting and Leaching Reactions for Chromium Chemical Manufacturing and Its Impact on Environment - A Review Sergio Sanchez

An efficient utilization of chromium–containing vanadium tailings ...

2019.8.15 In this study, soda roasting–water leaching process was used to extract chromium from CCVT effectively. The effects of roasting and leaching conditions on

Recovery of chromium by calcium-roasting, sodium-roasting,

2020.10.20 Chromium is a major strategic mineral widely used in industrial processes, yet mineral resources are decreasing, calling for advanced recycling techniques to recover chromium from ores, waste and contaminated media. Here, we review chromium resources and methods to leach out Cr, such as calcium-roasting, sodium

Selective recovery of vanadium from high-chromium

2023.12.1 Although the environmental impact of vanadium and chromium from high chromium vanadium residues can be reduced by using recovery processes such as multi-stage roasting and leaching [16], [18], solvent extraction [23], reductive precipitation [24], adsorption [25], and ion-exchange [26], all these processes suffer from high costs.

Roasting and Leaching Behavior of Nickel Laterite Ore

2021.3.29 Abstract Nickel is mostly extracted from sulfide ores, however, laterite ores account for over 60 pct of all nickel resources in the world, and despite its predominance, there is no well-established process to extract nickel from such ores. Nickel in laterites is hosted in many different compounds such as oxides, hydroxides, and silicates minerals.

Processing of Chromite Overburden by Soda Roasting to Recover Chromium

2021.6.17 The roasted product is leached in hot water condition at an optimum pulp density of 1:5 to obtain the chromium recovery. After leaching, ... The extent of chromium yield in the form of Na 2 CrO 4 depends in the soda-ash roasting process in the complex form of spinel solid solution [8, 9].

Extraction Behavior of Vanadium and Chromium by Calcification Roasting

2018.6.14 ABSTRACT Calcification roasting-acid leaching were conducted to investigate the extraction behavior of vanadium and chromium from high-chromium vanadium slag (HCVS). The conditions were optimized by response surface methodology (RSM). Results showed that when HCVS and CaO were mixed in m(CaO)/m(V2O5) of

Processes Free Full-Text High-Efficiency Stepped Separation

2023.2.3 High-chromium vanadium residue (HCVR (HCVR: high-chromium vanadium residue)) is an important secondary resource of valuable metals such as vanadium (V), chromium (Cr), and molybdenum (Mo). The mainstream technology for the utilization of HCVR, the Na2CO3-assisted-roasting–water-leaching method, usually

A cleaner and efficient process for extraction of vanadium from

2019.6.1 A cleaner and novelty leaching medium, (NH 4) 2 SO 4-H 2 SO 4 synergistic system was introduced into the leaching process for extracting vanadium efficiently after calcification roasting with high chromium vanadium slag (HCVS), and then V 2 O 5 was prepared after precipitation and roasting. The effects of leaching and

Separation and Recovery of Chromium from Solution After Vanadium ...

2020.10.30 Several extraction processes were proposed to recover vanadium and chromium from the V–Cr-bearing reducing slag, such as selective leaching vanadium by H 2 O 2 or air oxidation in NaOH solution [1, 2], roasting followed by alkaline leaching , roasting with sodium carbonate addition followed by sulfuric acid leaching , two-step

Efficient Recovery of Vanadium from High-Chromium Vanadium

2022.1.28 High-chromium vanadium slag (HCVS) is an important by-product generated during the smelting process of high-chromium-vanadium-titanium-magnetite. Direct acid leaching and calcium-roasting acid leaching technology were applied to recover vanadium and chromium from HCVS. The effects of experimental parameters

Efficient Vanadium Extraction from Shale with High Silicon

2021.8.19 With increasing demand for vanadium (V) products in recent years around China, the V utilization from V-bearing shale becomes very important. The V extraction from a shale in Shiyan, Hubei, China was systematically studied. For laboratory experiment, more than 75% of the V can be leached under the experimental conditions of the roasting

Process and Mechanisms for Extraction of Chromium and

2023.1.17 It was found that the optimal roasting temperature, time, weight ratio of Mg(OH)2 to V slag powder and leaching pH for extraction of Cr and V were 1000°C, 2 h, 1.0 and 0.1, respectively, and the extractions of Cr and V were 63% and 98%, respectively. Thus, Cr extraction was increased by 530% compared to conventional CaO/MgO roasting.

A clean and efficient leaching process for chromite ore

2014.6.1 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 chromium extraction rate increased significantly with the increase of temperature and oxygen partial

An efficient utilization of chromium–containing vanadium tailings ...

2019.8.15 Chromium–containing vanadium tailings (CCVT), an industrial waste, were utilized to extract chromium efficiently by soda roasting–water leaching process and for the preparation of highly pure chromium oxide.The effect of extraction of chromium under different roasting and leaching conditions were analyzed using X-ray diffraction

Reclamation of reactive metal oxides from complex minerals using

2014.11.30 As explained above, the traditional process for treating chromite ores is based on alkali roasting with soda ash, lime and dolomite under an oxidizing atmosphere at 1200 °C, which yields water soluble sodium chromate. 9 The sodium chromate is acidified with sulphuric acid to make sodium dichromate, which is crystallized and sold or roasted

Effect of chemical composition on the element distribution, phase ...

2022.11.4 The chemical composition of vanadium slag significantly affects its element distribution and phase composition, which affect the subsequent calcification roasting process and vanadium recovery. In this work, seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different

Recovery of chromium by calcium-roasting, sodium-roasting,

Much attention has been focused on leaching out chromium from chromium-containing ore. The traditional roasting process is classied into two types: calcium-roasting and sodium-roasting. The roasting process involves many opera-tions, and produces Cr-products and toxic residues. Direct acidic leaching is cleaner and conducted at low

Step-Adsorption of Vanadium (V) and Chromium (VI) in the Leaching

2020.4.14 The vanadium (V) and chromium (VI) was hard to separate directly due to the similar nature. In this paper, separation and recovery of vanadium (V) and chromium (VI) from a leaching solution was ...

Effective Extraction of Vanadium and Chromium from High Chromium

2016.8.1 Sodium salt roasting-water leaching and calcification roasting-acid leaching are the most common processes for vanadium production from vanadium slag [12] [13][14]. In the sodium-salt-roasting ...

Roasting and leaching behaviors of vanadium and chromium in ...

2017.9.13 Calcification roasting–acid leaching of high-chromium vanadium slag (HCVS) was conducted to elucidate the roasting and leaching behaviors of vanadium and chromium. The effects of the purity of CaO, molar ratio between CaO and V 2 O 5 ( n (CaO)/ n (V 2 O 5 )), roasting temperature, holding time, and the heating rate used in

Physical Chemistry of Roasting and Leaching Reactions for Chromium ...

Chromium is mainly used for the production of stainless steel, in electroplating, as pigments and in leather and refractory industries. 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