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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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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Direct Reduction of High-Phosphorus Oolitic Hematite: …

Phosphorus (P) is a non-renewable nutrient element for crop growth and a critical element for all living organisms. [1,2] It is used in fertilizers and feed extracted from phosphate rock, a rapidly depleted resource.[3,4] In recent years, with the global supply of high-quality phosphate rock reserves decreasing sharply, it is critical to find other phosphorus sources and …

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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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Efficient and sustainable phosphate removal and recovery from

Magnetite (Fe 3 O 4) ... [32], or metal carbonate [17], or layered double hydroxide [36], demonstrate both simplicity and high performance in phosphate removal. Zinc (Zn)-based Fe 3 O 4 composites have attracted growing attention due to the low solubility product (K sp-298 K) of Zn 3 (PO 4) 2, which is 10 −32.04.

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An innovative study for pretreatment of high-phosphorus oolitic

High-phosphorus oolitic hematite (HPOH) is a special type of OH in which harmful phosphorus is present at high levels, preventing its ... magnetite, and limonite) and gangues (chamosite, apatite, and quartz) contained within the HPOH expand at different rates when the temperature is increased, leading to thermal stresses formed at the ...

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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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Efficient and sustainable phosphate removal and recovery from

Phosphorus (P) is an essential nutrient for biological growth on Earth, widely used in agriculture [19].Since it cannot be substituted in food production, its availability is crucial for enhancing soil productivity, supporting crop yields, and sustaining the global human population [8].With the global population projected to increase by 2050, food demand is expected to rise by …

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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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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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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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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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(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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Strengthening iron enrichment and dephosphorization of high-phosphorus

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 process was studied by X-ray …

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Combined amendment and capping of sediment with ferrihydrite …

This study developed novel active capping systems with recycling convenience using ferrihydrite (Fh) combined with magnetite (Mag), and investigated the effectiveness and mechanism for the restriction of endogenous phosphorus movement from sediment into overlying water (OW) by the combined use of Fh and Mag.

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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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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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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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Characterisation of phosphorus and other impurities in goethite …

Australia's iron ore industry is undergoing a major transformation. Reserves of traditional high-grade ores are becoming depleted while the replacement ore types are lower in grade and sometimes require beneficiation to remove or minimise contaminants such as alumina, silica and phosphorus (Dukino et al., 2000).The phosphorus content of Australian iron ores is a …

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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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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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Extraction of Phosphorous from a Phosphorous-Containing …

Processes 2020, 8, 874 2 of 16 According to the statistical data of the international fertilizer organization, it was concluded that the decline in the global raw ore quality leads to the continuous decline in the proportion of the world0s P2O5 grade to more than 32% of the high-quality commodity phosphate ore. P2O5 grade has been an important supply source of …

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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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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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Phosphorus Migration Behavior of Medium-Phosphorus …

(Received on April 2, 2019; accepted on September 6, 2019) Time-dependent phosphorus migration characteristics during the carbothermic reduction process have been investigated …

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Interception of phosphorus release from sediment by magnetite…

The release of phosphorus from sediment and the high concentration of phosphorus in the water environment make the water body continuously eutrophic, so it is very important to develop new ...

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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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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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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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Study on gasification dephosphorization of phosphorus magnetite …

Medium and high phosphorus iron ores account for a high proportion of the total iron ore reserves in China, typical deposits are Bayan Obo medium phosphorus magnetite and western Hubei oolitic high phosphorus hematite. It is of great significance to study how to remove the harmful element phosphorus from iron ores and realize the utilization of ...

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