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Iron recovery and dephosphorization behaviors from high-phosphorus

With the depletion of high-quality iron ore resources, high-phosphorus oolitic hematite (HPOH) has attracted great attention due to its large reserve and relatively high iron content. However, HPOH is very difficult to be used in ironmaking process due to its special structure. A two-step method of gas-based direct reduction and magnetic separation was thus …

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Enhancing phosphate adsorption capacity of SDS-based magnetite …

The result indicated that low ion strength (<0.05 M) had limited role in phosphate adsorption while high levels (>0.1 M) decreased the adsorption of phosphate in the presence of CA. This was because of the ability of ions to compete for binding sites of magnetite with phosphate ion. 3.4. Generation and recycle

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CN104437858A

The invention provides a dephosphorizing method for high phosphorus magnetite ore. The dephosphorizing method comprises the following steps: crushing high phosphorus magnetite ore; grinding the crushed high phosphorus magnetite ore; mixing the ore and water into a seriflux; conducting preselection by adopting a magnetic extractor; conducting scavenging on tailings …

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Effect of calcium compounds on direct reduction and phosphorus …

The increasing demand for iron ore in the world causes the continuous exhaustion of magnetite resources. The utilization of high-phosphorus iron ore becomes the focus.

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Immobilization of mobile and bioavailable phosphorus in …

This work prepared lanthanum hydroxide (La-OH) and magnetite/lanthanum hydroxide composite (Mag-La-OH), and then La-OH and Mag-La-OH were used as sediment amendments to immobilize phosphorus (P) in sediments. The immobilization efficiency of mobile P (Mob P) and bioavailable P (BIO-P) in sediments by La-OH and Mag-La-OH was …

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Migration behavior of iron and phosphorus during gas-based …

On the contrary, phosphorus can be utilized to greatly enhance the economic value of the high-phosphorus iron ore (Yang et al., 2017, Udochukwu, 2019), instead of treating phosphorus as a harmful element.Phosphorus is an important chemical raw material, a necessary element for the growth of crops, and an important part of living matter (Avdalović et al., 2015, …

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SOLVING PHOSPHORUS REMOVAL CHALLENGES WITH …

effluent targets down to 0.05 mg/L total phosphorus, deal with wide fluctuations in flow, influent phosphorus and total suspended solids all within a compact footprint. This paper explains how magnetite ballasted technology came to be selected and presents almost eight years of operational experience and performance data. INTRODUCTION

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Phosphorus management options in wastewater treatment

Enhanced Biological Phosphorus Removal (EBPR), in which the reactor processes are optimized for high-efficiency phosphorus removal, can increase the biomass content of waste sludge to 3–6% phosphorus compared to conventional activated sludge systems (normally 1.5–2%). ... For biological processes, magnetite-based ballasted clarification can ...

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(PDF) Characterization of Magnetic Tailings from Phosphate-Ore

Reduction characteristics of high phosphorus . ... Magnetite converted from hematite was enriched in the concentrate of magnetic separation, while manganosite transformed from pyrolusite and ...

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Efficient Removal of Impurities from Refractory Oolitic Magnetite

Acid leaching is an effective method for dephosphorization; however, it is time-consuming and requires a high amount of acid consumption, resulting in increased production costs and environmental risks. This work aims to remove silicon, aluminum, and phosphorus …

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Fe-isotopic evidence for hydrothermal reworking as a

The genesis of high-grade Fe-Ti-V oxide ores (up to >90 vol%) in layered intrusions remains highly debated. Here, on example of Hongge layered intrusion in China, we show that hydrothermal dissolution and precipitation of Fe-Ti-V oxides played a critical role in forming high-grade massive ore deposits as demonstrated by textural-compositional evidence and in-situ …

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Beneficiation of phosphate ores using high gradient

In the first stage, a mineral slurry of 5% by weight prepared by adding 50 grams of the mineral rock phosphate to 1 litre of water and 100 mg of magnetite (fine powder) as a coating material for iron and the BENEF1CIATION OF PHOSPHATE ORES USING HIGH GRADIENT MAGNETIC SEPARATION 153 Phosphaleore (RSMDC) (Phosphorite 9 Calcite and Silica ...

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Phosphorus Gasification during the Carbothermic Reduction …

2.1.1. Medium Phosphorous Magnetite Ore The medium phosphorus magnetite ore (hereafter referred as raw ore) used in this work was provided by the Bayan Obo iron ore in Baotou, China. The main chemical com-position is listed in Table 1. The total iron grade is as low as 31.70 mass% and phosphorus content is as high as 0.91 mass%.

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Efficient and regenerative phosphate removal from wastewater …

The high affinity of Mg for phosphate and the formation of magnesium phosphate contribute to the effective regeneration of magnetite adsorbents and high-performance …

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Magnetite for phosphorus removal in low concentration …

Magnetite was greatly effective for phosphorus removal in the column experiments, which is a more practical reflection of phosphorous removal combing the adsorption isotherm model and …

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A New Route to Upgrading the High-Phosphorus Oolitic Hematite …

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 leaching were …

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Phosphorous adsorption on synthesized magnetite in wastewater

The material used for removing phosphorus must satisfy the following preconditions as an adsorbent: (1) high adsorption rate, (2) ... This result indicates that the proper ratio of phosphorous to magnetite is an important factor in the performance of an effective phosphorous removal process.

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Efficient and regenerative phosphate removal from wastewater …

In contrast, other magnetite phosphate adsorbents, such as MgO-impregnated magnetic biochar (Li et al., 2016), MgO-coated magnetic Fe 3 O 4 @SiO 2 nanoparticles (Li et al., 2022), andFe 3 O 4 @SiO 2-Mg 3 Fe LDH (Lu et al., 2020), exhibit weaker interactions between magnetite and adsorptive nanoparticles. This leads to detachment of the active ...

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Effects of magnetite on phosphorus storage and carbon cycling in …

Iron oxyhydroxides have also been suggested to play a role in the sorption and storage of phosphate in the Lake Michigan watershed (Klump et al., 1997), and iron-containing minerals such as magnetite are well-known for their capacity to sorb phosphate (Ajmal et al., 2018; Nowack and Stone, 2006).

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Phosphorus Migration Behavior of Medium-Phosphorus …

high-phosphorus pellets,28–31) as well as the mechanism of phosphorus migration using pure reagents.32) In this work, the phosphorus migration among the gas, iron and gangue phases of medium-phosphorus magnetite ore during the carbothermic reduction process was quantitatively inves-tigated. This includes gasificating dephosphorization and

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Water Handbook -Boiler Deposits: Occurrence And …

Phosphate Control. Calcium phosphate is virtually insoluble in boiler water. Even small levels of phosphate can be maintained to ensure the precipitation of calcium phosphate in the bulk boiler water-away from heating surfaces. ... (FeO) …

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Synthesis of magnetite particles for enhanced

EXD analysis confirmed Fe and O as the main constituents. The particles demonstrated effectiveness in phosphorus adsorption, with Scheme 1 exhibiting superior yield, P-recovery, and regeneration. These findings offer valuable insights into magnetite particle synthesis for optimal environmental performance, particularly in phosphorus removal.

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Effects of magnetite on phosphorus storage and carbon cycling in …

As shown in Fig. 5 a, the magnetic fraction of low magnetite sediments (L1, Fcb) yielded ∼10 times more extractable P than the bulk sediments, and 2–4 times more P was also observed in the magnetite fraction of high magnetite sediments compared to the bulk sediments (Stb1, S4.1). These results not only indicate that magnetite serves as a P ...

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Phosphorus in different types of ore, sulfides in the iron deposits

There are several examples of skarn-type ores, banded iron-formation-type ores, and massive stratiform sulfide ores where the phosphorus content is as high as in the phosphorus-rich occurrences of Kiruna-type ores.The Kiirunavaara orebody also includes tourmaline and sulfides in the form of pyrite-impregnated ore and pyrite-magnetite veins ...

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Genesis of a low-grade apatite-ilmenite-magnetite deposit in the

The high phosphorus content in the main zone is interpreted to result in crystallization of ilmenite and ilmenomagnetite instead of Ti-rich magnetite under relatively high f O2 conditions. High concentrations of titanium, iron and phosphorus in rocks of the main zone can be explained by pre-emplacement crystal-melt fractionation in a deep magma ...

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Enhanced iron extraction from high-phosphorus waste limonite …

Using the process of suspension magnetization roasting followed by magnetic separation and flotation to treat high-phosphorus iron ore, Zhang et al. [26] found that the Fe grade increased from 42.93 % to 59.50 % and the P content decreased from 0.58 % to 0.32 %, and near half of the phosphorus remained in the residual apatite after iron selection.

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Smelting Potential of HIsmelt Technology for High …

magnetite distribute almost all regions of China[2～5], but ... High-phosphorus iron ore mines distribute in Yunnan, Sichuan, Hubei, Hunan, Anhui, Jiangsu Provinces of

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Calcium Carbonate as Dephosphorization Agent in Direct …

Calcium carbonate, renowned for its affordability and potent dephosphorization capabilities, finds widespread use as a dephosphorization agent in the direct reduction roasting of high-phosphorus oolitic hematite (HPOIO). However, its precise impact on iron recovery and the dephosphorization of iron minerals with phosphorus within HPOIO, particularly the mineral …

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Enhanced precipitation performance for treating high-phosphorus

Du et al. (2019) used magnetite as magnetic seeds, and 7.5 g/L magnetite was required to enhance the sedimentation effect of coagulation flocs for wastewater with the phosphorous concentration of 134 mg/L. Comparatively, only 2.0 g/L of MS-CFA was required for wastewater with 200 mg P/L, saving almost half of the dosage. This indicated that MS ...

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Processes for phosphorus removal from iron ore

Phosphorus associated with the goethite in high-phosphorus iron ores can be removed to 0.075% P using a heat treatment at 300–350°C for 1 h with 10 wt% NaOH, followed by a water leach.

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