Binding effects in hematite and magnetite concentrates

Kawatra, S. Komar; Halt, Joseph A.

doi:10.1016/j.minpro.2011.03.001

Cited by 33 publications

(9 citation statements)

References 2 publications

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“…Recently published topics include flotation reagents and chemistry (Sandvik and Larsen 2014;Manouchehri 2014), filtration (Carlson and Kawatra 2008;Haselhuhn et al 2012b), water chemistry and zeta potential (Westerstrand and Ohlander 2010;Carlson and Kawatra 2008;Haselhuhn 2012;Haselhuhn et al 2012a), and agglomeration (Halt et al 2014;Kawatra and Halt 2011). However, very little research exists regarding the problem of dust generation from pellets.…”

Section: Introductionmentioning

confidence: 99%

Iron Ore Pellet Dustiness Part I: Factors Affecting Dust Generation

Halt

Nitz

Kawatra

et al. 2015

Mineral Processing and Extractive Metallurgy Review

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Iron ore pellets abrade during handling and produce dust. This study was conducted to determine what factors affect pellet dustiness, and whether dustiness can be related to the abrasion index. Factors studied included bed depth within a straight grate furnace; pellet chemistry; firing temperature; coke breeze addition; and tumble index. Abrasion indices for all pellet samples ranged from 1.9-5.0% (20 samples) and from 7.1-27.5% (5 samples). Pellets were dropped in an enclosed tower, which enabled the collection of airborne particles generated during pellet breakdown. The quantity of airborne particles generated by each pellet type was 10-100 mg= kg-drop, or 50-500 mg=kg over five drops through the tower. Pellet dustiness was predominantly affected by pellet chemistry and by pellet firing temperature. Results showed a nearly 21% increase in dustiness for every percent decrease in firing temperature -this was based on a typical firing temperature of 1280 C. Pellet dustiness was regressed to the pellet abrasion index (for AI < 5%), which yielded a correlation coefficient of 0.22. These results show that, although AI is one of the best indicators of fired pellet quality and can indicate high levels of dust, it could not explain the dustiness of good quality pellets.The second paper (Iron Ore Pellet Dustiness Part II) explains the relationship between AI and dust for good-quality pellets; and compares fines generation between pellets fired in Straight-Grate (Traveling Grate) and Grate-Kiln furnaces.

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Section: Introductionmentioning

confidence: 99%

Iron Ore Pellet Dustiness Part I: Factors Affecting Dust Generation

Halt

Nitz

Kawatra

et al. 2015

Mineral Processing and Extractive Metallurgy Review

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“…The strength of green pellets mainly depends on the capillary negative pressure of the liquid saturated pores and surfaces, which lays between iron ore particles [3,26]. The linear relationship between the green pellet mechanical strength and the saturation degree of the particles with water is explained by researchers [27][28][29]. Results showed that, as the hematite content in the mix pellets increased, the green pellet drop number decreased from 6.5 to 5.2 and the compressive strength of green pellets decreased from 1.51 to 1.28 kg/pellet.…”

Section: Mechanical Strengths Of Green Pelletsmentioning

confidence: 99%

The study of pelletizing of mixed hematite and magnetite ores

Kumar¹,

Ravi²,

Sivrikaya

et al. 2019

SCI SINTER

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The present study aims to investigate the use of mixed hematite and magnetite ores in iron ore pellet production. Pelletizing tests were carried out on the hematite and magnetite premixed pellet feed. Drop number and compressive strength tests for green and dry pellets; porosity, compressive strength and reducibility tests for fired pellets were carried out to determine the influence of mixing ratios of both iron oxides on those pellet properties. Experimental results showed that as the hematite content in the mix pellets is increased, the green drop number decreased from 6.5 to 5.2, the green compressive strength decreased from 1.51 to 1.28 kg/pellet and the dry compressive strength decreased from 2.50 to 1.60 kg/pellet. It was determined that fired compressive strength of mix pellets decreased from 380 to 230 kg/pellet when the hematite content in the mixed pellet is increased. The reducibility of mix pellets had almost the same trend and it was faster up to 40 min reduction time. The results showed that the use of hematite together with magnetite is possible to produce pellets with sufficiently good quality in terms of wet, dry and fired mechanical strengths. The porosity and reducibility values of mix pellets were also found to be adequate to use as feed for the blast furnace.

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“…Flotation stage may be introduced to enrich the purity of magnetic concentrates further [1,3,4]. The final magnetic concentrates generated are mixed with a binder for the preparation of pellet for steel-making process [5]. The lower yield and recovery of the process particularly for lowgrade iron ores and requirements of large numbers of unit operations are the major disadvantages of the conventional beneficiation process.…”

Section: Introductionmentioning

confidence: 99%

Utilization of low-grade BHQ iron ore by reduction roasting followed by magnetic separation for the production of magnetite-based pellet feed

Sahu

Sharma

Barma

et al. 2019

Metall. Res. Technol.

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Due to the depletion of high-grade iron ores and their simultaneous demand, the utilization of lowgrade iron ores such as banded hematite quartzite (BHQ) has become a topic of research interest around the globe, particularly in India. These low-grade iron ores are reckoned to be the future feedstock for iron and steel making industries. However, one of the major challenges is to remove associated gangue impurities from such low-grade iron ores by the conventional beneficiation techniques prior to its industrial applications. The reduction roasting process is one of the potential alternatives to overcome such challenges. Herein, we have presented the feasibility study using reduction roasting process on one of the Indian low-grade BHQ iron ore for the preparation of magnetite concentrate-based pellet feed materials. To establish the methodology of the reduction roasting process, different experimental parameters such as roasting temperature, reductant dosage, roasting time and fixed carbon were optimized for obtaining the maximum recovery, yield, and grade of the magnetite products. In the present study, Indian non-coking coals were used as reductant due to its large availability in the country. Using one of the non-coking coals as reductant, the optimum condition were found to be as, roasting temperature: 1100°C, roasting time: 5 min, and head sample to reductant ratio: 10:6. Under these conditions, maximum grade and recovery of final magnetite concentrates were found to be 66.42 and 93.53%, respectively. It is expected that the large-scale development of reduction roasting process would lead to effective utilization of low and lean grade iron ore resources for the production pellet feed materials in the Indian context and simultaneously conserve the natural magnetite ores for future generation.

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Binding effects in hematite and magnetite concentrates

Cited by 33 publications

References 2 publications

Iron Ore Pellet Dustiness Part I: Factors Affecting Dust Generation

Iron Ore Pellet Dustiness Part I: Factors Affecting Dust Generation

The study of pelletizing of mixed hematite and magnetite ores

Utilization of low-grade BHQ iron ore by reduction roasting followed by magnetic separation for the production of magnetite-based pellet feed

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