Keywords. Oolitic hematite. Reduction roasting. Magnetic separation. Additive. ... 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 …

The oolitic hematite with 47.64% T. Fe and 0.93% P used in this study was collected from Hubei Province, China. Figure 1 shows the back-scattered (BSE) image of oolitic hematite and element maps for Fe, O, Ca, P, Si, and Al. Based on EDS analysis, it can be seen that the mineral phases contained hematite, chlorite, apatite, and quartz.

Hematite has a wide variety of other uses, but their economic significance is very small compared to the importance of iron ore. The mineral is used to produce pigments, preparations for heavy media separation, radiation shielding, ballast, and many other products. Hematite's Streak: All specimens of hematite will produce a reddish streak.

Keywords: oolitic hematite; microwave; acid leaching; selective liberation; dephosphorization 1. Introduction As a typical refractory iron ore, high-phosphorus oolitic hematite is distributed widely and is an abundant resource worldwide. There are approximately 30–40 billion tons of high-phosphorus

Keywords. Oolitic hematite. Direct reduction. Phosphorus removal. Magnetic separation. Download conference paper PDF. Introduction. China has large …

Oolitic hematite is an iron ore resource with complex refractory characteristics, abundant reserves, and significant recycling value. In this study, a clean …

Keywords. High-phosphorus oolitic iron ore. Separation of iron and phosphorus. ... Effect of coal levels during direct reduction roasting of high phosphorus oolitic hematite ore in a tunnel kiln. Int. J. Min. Sci. Technol., 22 (2012), pp. 323-328, 10.1016/j.ijmst.2012.04.007.

A sulfurized oolitic hematite (SOH-600) was prepared successfully via annealing oolitic hematite in hydrogen sulfide and was investigated as a heterogeneous Fenton catalyst for the degradation of tetracycline. The physicochemical properties of SOH-600 before and after reaction were characterized by XRF, XRD, XPS, SEM and FT-IR.

province, and Tunqiu in Guangxi province is all oolitic hem-atite [1–2]. Some oolitic hematite ores in China have a high-phosphorus content in the general range of 0.4wt% to 1.2wt%, which are referred to as high-phosphorus oolitic hematite ores. The high-phosphorus oolitic hematite in China with reserves of 3.72 billion tons is mainly composed

Keywords: oolitic hematite ore; reduction; phosphorus; migration behavior; pre-dephosphorization 1. Introduction Due to the depletion of high quality iron ores with the rapid development of the iron and steel industry, the utilization of refractory iron ores has recently attracted increased attention [1–3].

The paper proposes the innovative technology of hydrogen mineral phase transformation–magnetic separation–acid leaching for iron enrichment and …

In this paper, an innovative method is proposed to upgrade iron and remove phosphorus from high-phosphorus oolitic hematite ore by the sodium magnetization roasting–magnetic separation–sulfuric acid …

Keywords: dephosphorization; blast furnace dust; coal slime; high-phosphorus oolitic hematite; DRI 1. Introduction Heavy dependence upon imported iron ore concentrates is one of the most significant challenges for China's pyrometallurgical industry. In China, high-phosphorus oolitic hematite constitutes

The oolitic structure is concentric rings with fine-dispersed gangue. Based on the morphology change and the EDS analysis before and after the leaching process, the apatite in the oolitic hematite exists in the core of the ooide (the right dark banana-like area in Fig. 10 (a)), and sandwiches in the hematite layers (position 1 in Fig. 10 (a)).

Effective Cu(II) ions adsorption from aqueous solutions using low grade oolitic hematite tailing with phosphorus: response surface methodology Xiaoli Yuan*, Fuming Luo, Xixi Chen, Wentang Xia*, Yin Zou, Xuejiao Zhou, Hao Liu, ... Keywords: Low grade oolitic hematite tailing with phosphorus (LGOHTWP); Cu(II) ion removal;·

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 …

It is highly difficult to remove phosphorus from high phosphorus oolitic hematite by the usual dressing process. Acid leaching is an effective method for the dephosphorization of high phosphorus oolitic hematite. The acid leaching experiments were conducted to study the effect of acid concentration, temperature, leaching time, solid-liquid (S/L) ratio and …

The oolitic hematite reduction experiments were carried out at the reduction temperature of 1000°C (30, 60, 90, and 120 min) and the reduction time of 120 min (900°C, 1000°C, and 1100°C) with H 2 (300 ml/min). After reduction, the cooled sample was cut into two from the middle, and one of them was observed using optical microscopy.

The reduction of Guizhou oolitic... | Find, read and cite all the research you need on ResearchGate ... Research on the reduction of Guizhou oolitic hematite by hydrogen. January 2016; Green ...

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 …

Keywords: oolitic hematite–coal composite briquettes; particle size; growth behavior; size characterization; coal-based reduction 1. Introduction 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,

Keywords: oolitic hematite; microwave roasting; simulation; microstructure evolution. 1. Introduction. Iron ore is a major strategic requirement for supporting the …

To reveal the growth behavior and size characterization of iron particles in coal-based reduction, we reduced oolitic hematite–coal composite briquettes at various temperatures, durations and ore size …

A process of H 2 reduction followed by the slag/metal separation for the utilization of high-phosphorus oolitic hematite has been proposed. The H 2 reduction was conducted at 1073 K in a horizontal rotary electric resistance furnace, which significantly promotes the metallization ratio of reduced ore fines. Thermodynamic calculation of H 2 reduction for …

hematite layers to form an oolitic structure, and part of the granular apatite is dispersed between the oolitic structure. A SEM image of the oolitic structure is shown in Figure 3 .

To investigate the effects of heating pretreatment on the distribution of phosphorus elements, phase transformation, and microstructure evolution mechanisms …

Heavy dependence upon imported iron ore concentrates is one of the most significant challenges for China's pyrometallurgical industry. In China, high-phosphorus oolitic hematite constitutes approximately 11.1% of iron reserves, hence the application of recovering these refractory ores can be considered based on current situation …

of oolitic hematite ore at 1200 C, and a directly reduced iron assayed at 93.28% Fe and 0.07% P was obtained with an iron recovery of 92.30%. Direct reduction is an efficient way to separate iron and phosphorus from oolitic hematite ore [23]. However, the amount of reductant required is very high and the reduction time is very long, …

Oolitic hematite ore with high-phosphorus content is currently recognized as one of the most refractory iron ore resources in the world. The high-phosphorus content and unique structure of the oolitic hematite ore make it difficult to be beneficiated. ... Keywords. Phosphorus; Direct reduction; Oolitic hematite; Metallic iron; Chapter PDF ...

The feasibility of dephosphorization using the flotation process and its mechanism of high-phosphorus oolitic hematite were discussed in this paper. The results showed that phosphorus minerals mainly exist in the form of collophane, which can be divided into three types. Block collophane and band collophane could be effectively …