Oolitic hematite is an iron ore resource with complex refractory characteristics, abundant reserves, and significant recycling value. In this study, a clean and innovative microwave fluidization roasting method was developed. Iron concentrate with an iron grade of 58.72% and iron recovery of 89.32% was obtained via microwave …

Results showed that iron oxides in the oolitic hematite ore were reduced to metallic iron from outer to inner layers; these oxides gradually grew into quasi-spherical iron particles with random distribution …

In the process of coal-based direct reduction–magnetic separation for treating high-phosphorus oolitic hematite ore, the addition of sodium sulfate improved dephosphorization and increased DRI iron content. However, sodium sulfate also increased the S content of the DRI products. Although the S content of the DRI can be reduced to …

It is found that this kind of oolitic hematite ore contains 47.71% TFe, 10.96% SiO2, as well as 0.874% P, with hematite as the dominant Fe-bearing minerals, and quartz, chamosite, illite and ...

Abstract. Oolitic hematite possesses the characteristics of large resource reserves, low iron grade, fine embedded particle size and complex mineral composition, …

Oolitic hematite ore is a significant existing form of iron ores, which are widely distributed in France, Germany, the United States, Canada, Pakistan, China, and other countries [1,2].In China, 3.72 billion tons of explored reserves of oolitic hematite ores accounts for approximately 1/9 of total iron ore resources [].As one of the most refractory …

The oolitic hematite ore sample was taken from Hunan province, China. The chemical composition of the ore sample is presented in Table 1. The total iron grade is as low as 48.96%, and the main impurities composition include 15.69% SiO 2, 7.56% Al 2 O 3, and phosphorus content is as high as 1.61%.

Abstrat：Oolitic hematite with high iron content and large reserves, has become a key iron ore development target recently. But most of the oolitic hematite containing high phosphorus needs to be ...

1. Introduction. With the increasing consumption of high-quality iron ore, realizing the efficient utilization of refractory iron ore resources is of strategic significance for the sustainable development of the iron and steel industry (Qin et al., 2023, Sahu et al., 2023, Yuan et al., 2019).Among refractory iron ores, high-phosphorus oolitic iron ore …

ABSTRACT Fe–P separation and the behaviors of Fe and P in separation process of high-phosphorus oolitic hematite ore from western Hubei province in China were studied. Various parameters, including reducing temperature and time, dosage of the pulverized coal, grinding fineness of magnetic separation feed, magnetic field intensity …

Oolitic hematite is an iron ore resource with rich reserves, complex composition, low grade, fine disseminated particle sizes, and a unique oolitic structure. In this study, a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore. The results showed that under the conditions of …

The ore dressing process of oolitic high phosphorus hematite includes the following steps: roasting crushed oolitic high phosphorus hematite in 80-99 wt% with coal powder as reductant in 1-20 wt% inside a shaft furnace or rotary kiln at 700-1050 deg.c for 0.5-2.5 hr and sealed cooling to room temperature; crushing the roasted hematite, …

To explore the microstructure evolution of oolitic hematite during microwave fluidization roasting, COMSOL multiphysics and scanning electron microscopy …

Direct reduction of high-phosphorus oolitic hematite ore based on biomass pyrolysis gases (CO, H 2, and CH 4), tar, and char was conducted to investigate the effects of reduction temperature, iron ore-biomass mass ratio, and reduction time on the metallization rale.In addition, the effect of particle size on the dephosphorization and iron …

A large number of studies have shown that oolitic hematite is an iron ore that is extremely difficult to utilize because of its fine disseminated particle size, high harmful impurity content and oolitic structure. To recover iron from oolitic hematite, we developed a novel multistage dynamic magnetizing roasting technology.

The Ningxiang type oolitic hematite, which is widely distributed in Hubei, Hunan, Sichuan, Guizhou and other regions, is one of the largest reserves of sedimentary iron ore in China. The iron ore reserves of 3.72 billion tons, account for approximately 73.5% of the sedimentary iron ore in China ( Lu et al., 1994 ).

With the continuous consumption of easy-to-treat, high-grade iron ores, the effective utilization of difficult-to-treat iron ores such as high-phosphorus oolitic hematite has gradually become a popular research topic [1,2,3].High-phosphorus oolitic hematite is primarily distributed in Nigeria, Saudi Arabia, Libya, Algeria, the USA, and China, and its …

Coal-based reduction followed by magnetic separation is an effective way to recover iron from high phosphorus-containing oolitic hematite ore. Given that high quantities of dephosphorization agent are needed to obtain low phosphorus reduced iron, a novel approach is proposed by the authors. Without prior phosphorus removal, the …

Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting – gas-based reduction (ORGR) and magnetic separation process was developed. The underlying …

A magnetic concentrate with total iron grade of 92.7% and phosphorus content of 0.09% was obtained from an oolitic hematite ore containing 48.96% iron and 1.61% phosphorus when reduced in the ...

Magnetizing roasting of oolitic hematite ore from western Hubei Province was investigated. The mechanism for reduction roasting of oolitic hematite ore was discussed and analyzed. It is found that flash magnetizing roasting-magnetic separation process is a promising approach for the processing of oolitic hematite ore from western …

Oolitic hematite is one of the most refractory iron ores with complicate mineral compositions and abundant reserves in China. The hematite and limonite in the ore integrate closely with fine ...

Oolitic hematite possesses the characteristics of large resource reserves, low iron grade, fine embedded particle size and complex mineral composition, which is difficult to be used efficiently through traditional beneficiation process. In this work, a new technology of microwave fluidization pretreatment (MFP) was proposed to strengthen the …

Oolitic hematite is comprised of oolites which are small, sand-sized spherical or oval grains that form as hematite precipitates from fluids. Typically oolites consist of thin concentric crystal layers that, on broken surfaces, appear as nested spheres or ovals. ... The Clinton hematite formation of ore was first discovered in the Town of ...

The oolitic hematite ore used in the test was provided by Liuzhou Iron and Steel Group. The ore sample was crushed, screened, mixed, and shrunk as the raw material for the test. The chemical multi-element analysis of raw materials was carried out using X-ray fluorescence (XRF), and the results are presented in Table 1 .

Hematite (Oolitic, red) WARD470103-866. 470103-866PK 13.65 USD. 470103-866. Hematite (Oolitic, red) The most important ore of iron – found in compact and friable sedimentary beds, in lava flows, as a volcanic sublimate, and as an accessory in veins. A mineral of varied appearance, Hematite ranges from a soft red sludge to black metallic ...

The ore in this test was a high-phosphorus oolitic hematite ore (HPOHO) of the Ningxiang type collected from Guangxi Province, China, and its chemical composition is shown in Table 1. The content of total Fe and P 2 O 5 was 49.41% and 2.13%, respectively, and the content of FeO was only 0.64%, indicating the presence of sparse magnetite.

Oolitic hematite is an iron ore resource with rich reserves, complex composition, low grade, fine disseminated particle sizes, and a unique oolitic structure. In this study, a microwave-assisted ...

The bean oolitic structure is a concentric girdle with an alternating arrangement of certain amounts of chlorite, hydromica, dolomite, and hematite, and is round, sub-rounded, and oval in...

High-phosphorus oolitic hematite ore is a typical refractory iron ore that is widely distributed around the world. It has the characteristics of low iron grade (35–50%), …