Beneficiation of ferruginous bauxites by high-gradient magnetic separation

Bolsaitis, P.; Chang, V.; Schorin, H.; Aranguren, R Carmen

doi:10.1016/0301-7516(81)90015-6

Cited by 20 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beneficiation is often considered for the upgrade of bauxite ores in order to also render them suitable for the refractory/ceramics industry [13,16]. Studies focusing on the removal of iron-bearing minerals include magnetic/gravimetric separation [24][25][26], reductive roasting followed by magnetic separation [17,22,27], froth flotation [28][29][30], leaching of iron oxides [31], chlorination followed by leaching [32] and microwave-magnetising roasting [33]. Other studies have attempted to upgrade bauxite ores through selective grinding by exploiting the different grindability between the minerals of interest, e.g., diaspore (6.5-7 Mohs hardness) and gangue minerals, e.g., kaolinite (2-2.5 Mohs hardness) and some other aluminosilicates [20,34].…”

Section: Introductionmentioning

confidence: 99%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

View full text Add to dashboard Cite

This laboratory study investigates selective grinding and beneficiation options for a Greek bauxite ore. First, a series of batch grinding tests were carried out in order to investigate the grinding behavior of the ore and the effect of the material filling volume (fc) on the distribution of aluminium- and iron-containing phases. Then, the ground ore was subjected to magnetic separation either as received or after reduction roasting in order to further explore potential beneficiation options. The results showed that grinding of the ore exhibits non-first order behavior, while the breakage rate varies with grinding time. Additionally, Al2O3 tends to concentrate in the coarser than 0.300 mm product fraction, while fc 10% and 2 min of grinding time are considered optimum conditions for good distribution of Al2O3 and Fe2O3. When different product fractions were subjected to magnetic separation, it was seen that the non-magnetic product obtained from the 0.300–1.18 mm fraction was more rich in Al2O3. In this fraction, the Al2O3 content increased from 58 wt% in the feed to 67.9 wt%, whereas the Fe2O3 content decreased from 22.4 wt% in the feed to 13.5 wt%. When the ore was subjected to a two-step treatment, involving reduction roasting followed by magnetic separation, the Fe2O3 grade decreased from 20.8 to 5.1 wt%, but in this case the recovery was very low.

show abstract

Section: Introductionmentioning

confidence: 99%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

View full text Add to dashboard Cite

show abstract

“…The nature of the separation in HGMS enables its application for fine particles at high throughput. 31,32…”

Section: Magnetic Concentration Stepsmentioning

confidence: 99%

Preconcentration of Low-Grade Ta–Nb Deposit Using Physical Separation Methods

Cao

Gao

2021

JOM

View full text Add to dashboard Cite

Ore from the Jinzhulong Ta-Nb deposit was processed using a combination of gravity concentration and magnetic separation to upgrade the columbitetantalite fines. Two flowsheets, namely for gravity concentration-magnetic separation (the conventional flowsheet) and magnetic separation-gravity concentration (the novel flowsheet), are proposed herein, and the factors affecting the performance of gravity/magnetic separation were studied to optimize the flowsheets. Compared with the conventional flowsheet, the novel flowsheet was more effective for columbite-tantalite beneficiation and beneficial to the comprehensive recovery of nonmetallic minerals. In the novel flowsheet, the sample is ground to size of P 80 = À74 lm then fed into a combination of a low-intensity wet drum magnetic separator and pulsating highgradient magnetic separator to reject nonmagnetic gangue minerals while preconcentrating the paramagnetic columbite-tantalite; the high-gradient magnetic separation concentrates were screened into three size fractions and further upgraded by gravity concentration. The enrichment ratios for Ta 2 O 5 and Nb 2 O 5 were 403.8 and 385.6, respectively.

show abstract

“…The heterogeneous minerals in iron-rich bauxite are treated with conventional techniques, such as gravity concentration [18], magnetic separation [19], flotation [20], roasting followed by magnetic separation [21,22] and chemical leaching [23,24]. All of these conventional techniques cannot recover iron and aluminum from iron-rich bauxite effectively.…”

Section: Comprehensive Utilization Processes Of Iron-rich Bauxitementioning

confidence: 99%

Aluminum Mineral Processing and Metallurgy: Iron-Rich Bauxite and Bayer Red Muds

Qi¹,

Li²

2020

Aluminium Alloys and Composites

View full text Add to dashboard Cite

Bauxite is the main source for alumina production. With the rapid development of iron and steel industry and aluminum industry, high-quality iron ore and bauxite resources become increasingly tense. However, a lot of iron-rich bauxite and Bayer red mud resources have not been timely and effectively recycled, resulting in serious problems of environmental pollution and wastage of resources. The comprehensive utilization of iron-rich bauxite and red mud is still a worldwide problem. The industrial stockpiling is not a fundamental way to solve the problems of ironrich bauxite and red mud. As to the recovery of valuable metals from iron-rich bauxite and red mud, there are a lot of technical and cost problems, which are serious impediments to industrial development. Applying red mud as construction materials like cement, soil ameliorant applications face the problem of Na, Cr, As leaching into the environment. However, the high-temperature reduction, smelting and alkaline leaching process is a feasible method to recover iron and alumina from iron-rich bauxite and red mud. This chapter intends to provide the reader an overview on comprehensive utilization technology of the low-grade iron-rich bauxite and Bayer red mud sources.

show abstract

Beneficiation of ferruginous bauxites by high-gradient magnetic separation

Cited by 20 publications

References 11 publications

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Preconcentration of Low-Grade Ta–Nb Deposit Using Physical Separation Methods

Aluminum Mineral Processing and Metallurgy: Iron-Rich Bauxite and Bayer Red Muds

Contact Info

Product

Resources

About