oolitic hematite keywords

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;·

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,

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

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

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.

Keywords: Acid leaching High phosphorus oolitic hematite Dephosphorization Iron loss Kinetics ABSTRACT 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

Yanjun Li. Oolitic hematite, as a complex and refractory iron ore resource, can be efficiently utilized by magnetic roasting. In this study, to ascertain the mechanism …

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 …

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.

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.

reduction process of direct high-phosphorus oolitic hematite to provide a basis for selecting a raw material particle size for direct reduction of high-phosphorus oolitic hematite in industrial applications. 2 Maerials t and Methods 2.1 Maerialst The high-phosphorus iron ore considered in this study was obtained from Algeria.

Recently, additives such as Na 2 SO 4 and Na 2 CO 3 have been proven to be capable of enhancing the reduction of phosphorus-rich oolitic hematite ore and the recovery of dephosphorized iron by magnetic separation. In this study, the behavior of phosphorus during the carbothermic reduction of a phosphorus-rich oolitic hematite ore …

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 pretreatment at 1050 °C for 2 …

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

The release of valuable minerals from the associated gangues is called liberation. Good liberation is essential to the subsequent separation stage. Selective liberation is advantageous to improve the degree of liberation. Oolitic hematite is one of the typical refractory iron ores in China, and its resources are abundant. However, owing …

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 …

The microstructure of the sample is observed by an optical microscope (Fig. 1) and a scanning electron microscope equipped with an energy diffraction spectrum (SEM-EDS, Fig. 2).In Fig. 1, Fig. 2, it can be seen obviously that the unique concentric layered texture is formed in the oolitic hematite ore.The oolitic particle sizes are in the range of …

Li et al. reported the effect of sodium sulfate on reduction roasting and P removal from high-phosphorus oolitic hematite ore.The results showed that a magnetic concentrate with total iron grade of 92.7% and phosphorus content of 0.09% was produced from an oolitic hematite ore containing 48.96% iron and 1.61% phosphorus, where …

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 ...

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 .

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 …

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 …

Industry test on phosphorus removal and direct reduction of the "Ningxiang type" high-phosphorus oolitic hematite ore has been carried out in a tunnel kiln on the basis of laboratory experiment. The iron grade and phosphorus content of the initial sample are 42.46% and 0.867%, respectively. The results showed that high-phosphorus oolitic …

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

Abstract. High-P oolitic hematite is recognised as one of the most refractory mineral resources because of the special oolitic structure. Conventional selective reduction roasting is characterised by high energy consumption and large greenhouse …

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

Recently, additives such as CaCO 3 and Na 2 CO 3 have been proven to be capable of enhancing the reduction of high-phosphorus oolitic hematite ore and obtaining high-grade direct reduction iron (DRI) with low-P by magnetic separation. In this study, the mechanisms of adding CaCO 3 during direct reduction were further studied by gas analyzer, X-ray …

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 …

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 …

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 and sodium hydroxide leaching process. The process parameters of sodium magnetization roasting, acid leaching, and alkaline …

Keywords: dephosphorization; oolitic hematite; flotation; mechanism. 1. Introduction. In recent decades, iron ore resources have been consumed in large …

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

The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China. In this paper, the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting-leaching …

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.

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

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 …