Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation

Jang, Kyoung-oh; Nunna, V.; Hapugoda, Sarath; Nguyen, Anh V.; Bruckard, Warren J.

doi:10.1016/j.mineng.2014.01.021

Cited by 87 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Together with hydrometallurgical methods such as leaching, roasting has been widely used in the enrichment of low-grade mineral resources, such as goethite, copper oxide, manganese oxide ores, and galvanic sludge [85][86][87][88]. Research related to REE recovery using roasting from secondary resources has been published in recent years.…”

Section: Enrichment Of Rees Using Roastingmentioning

confidence: 99%

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products

Zhang

Rezaee

Bhagavatula

et al. 2015

International Journal of Coal Preparation and Utilization

165

View full text Add to dashboard Cite

Previous research indicates that coal and coal by-products are a potential source of critical elements including rare earth elements (REE) with estimated amounts in the range of 50 million metric tons. Despite the proven presence of elevated REE concentrations, commercial extraction and recovery have not been realized. This article provides a review of the abundance, mode of occurrence, and recovery methods of rare earth elements in coal and coal by-products. The feasibility of using established REE extraction and recovery technologies is discussed along with issues associated with their use with coal resources.

show abstract

Section: Enrichment Of Rees Using Roastingmentioning

confidence: 99%

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products

Zhang

Rezaee

Bhagavatula

et al. 2015

International Journal of Coal Preparation and Utilization

165

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the iron recovery decreased obviously as the roasting temperature was higher than 850°C, and the effect of CaO on the phase transformation of iron oxides was still unclear. Previous researches have studied more about the convert of iron oxides during the magnetizing roasting process, [11][12][13][14] Reaction between CaO but few researchers have studied the effect of gangue compositions (such as CaO and SiO 2 ) on the phase transformation of iron oxides. Thus, the major objectives of this study was: 1) to investigate the reaction behaviors between CaO and Fe 3 O 4 under CO-CO 2 atmosphere at 800°C-1 100°C; 2) to determine the effect of CaO on the iron recovery during the magnetizing roasting process; 3) to reveal the effect of CO-CO 2 atmosphere on the redox reactions of iron oxide in the present of CaO by using X-ray diffraction (XRD), Vibrating Sample Magnetometer (VSM), FactSage phase diagram analysis, etc.…”

Section: Introductionmentioning

confidence: 99%

Reaction between CaO and Fe3O4 under CO–CO2 Atmosphere at 800°C–1100°C

Zhang

Chen

et al. 2017

ISIJ Int.

View full text Add to dashboard Cite

“…One of the current operational trends consists in increasing the temperature of the reduction zone, in order to attain a higher productivity, due to the thermodynamic improvement of the reaction conditions [6]. For this reason, it has been suggested to evaluate the possibility of applying a heat treatment prior to the reduction stage, in order to reduce the moisture content of the ore, as well as its chemically bound water content [7]; this procedure may also improve the reactivity characteristics of the ore, which can save processing time in the reduction stage. Another problem of limonitic ores is their strong tendency to present impurities; in fact, a typical case is the presence of phosphorous, which is a deleterious element, very difficult to control during the reduction and steelmaking stage.…”

Section: Introductionmentioning

confidence: 99%

“…This situation is common in other parts of the world, such as Australia [7], and implies major challenges for the industry, in terms of mineral handling and further processing. For this reason, it is necessary to conduct an exploratory research to understand the behavior of this type of limonitic ores during calcination.…”

Section: Introductionmentioning

confidence: 99%

Estudio del proceso de calcinación en dos minerales de hierro limoníticos entre 250 °C y 950 °C

et al. 2017

View full text Add to dashboard Cite

The dehydration process of two limonitic ores from Venezuela was studied between 250 °C and 950 °C by means of thermogravimetry, infrared spectroscopy, and x-ray diffraction. These techniques indicated for both minerals that the goethite-to-hematite transformation occurred in the range of 250-350 °C. In addition, the x-ray diffraction showed a structural re-arrangement within the orebody above 350 °C, temperature above which only the hematite structure is recognizable. Finally, infrared spectroscopy revealed that such transformation implies the loss of structural OH-functional groups, characteristic of the limonite.Keywords: Iron Ore; Limonite; Thermal Modification of Minerals. ResumenSe estudió el proceso de deshidratación de dos minerales limoníticos de Venezuela entre 250 °C y 950 °C, usando termogravimetría, espectroscopia infrarroja y difracción de rayos x. Para ambos materiales, estas técnicas indicaron que la transformación de goethita a hematita ocurrió en el rango de 250 °C a 350 °C. Adicionalmente, la difracción de rayos X mostró un rearreglo estructural dentro de la mena a una temperatura por encima de 350 °C; a temperaturas mayores, solo se reconoce la estructura de la hematita. Finalmente, la espectroscopia infrarroja reveló que la transformación de goethita a hematita implica la pérdida de grupos funcionales de OH-estructural característicos de la limonita. Study of the calcination process of two limonitic iron ores between 250 °C and 950 °C ResumoEstudou-se o processo de desidratação de dois minérios limoníticos da Venezuela entre 250 °C e 950 °C, usando termogravimetria, espectroscopia infravermelha e difração de raios x. Para ambos os materiais, estas técnicas indicaram que a transformação de goethita a hematita ocorreu no intervalo de 250 °C a 350 °C. Adicionalmente, a difração de raios X mostrou um rearranjo estrutural dentro do minério a uma temperatura por cima de 350 °C; a temperaturas maiores, só reconhece-se a estrutura da hematita. Finalmente, a espectroscopia infravermelha revelou que a transformação de goetite a hematita implica a perda de grupos funcionais de OH-estrutural característicos da limonita.Palavras chave: Limonita; Mineral de ferro; Modificação térmica de minérios.Cómo citar este artículo: L. Longa-Avello, C. Pereyra-Zerpa, J. A. Casal-Ramos, and P. Delvasto, "Study of the calcination process of two limonitic iron ores between 250 °C and 950 °C," Rev.

show abstract

Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation

Cited by 87 publications

References 15 publications

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products

Reaction between CaO and Fe<sub>3</sub>O<sub>4</sub> under CO–CO<sub>2</sub> Atmosphere at 800°C–1100°C

Estudio del proceso de calcinación en dos minerales de hierro limoníticos entre 250 °C y 950 °C

Contact Info

Product

Resources

About