Abstract: 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 diffraction …
Aug 01, 2017 In these high phosphorus manganese ores, the phosphorus can be reduced to 0.15% or less by roasting the ores with 2–6 wt% NaCl at 750–800 C followed by leaching in 0.5–0.75 M HNO 3 at 40–60 C for a period of 15–20 min. Nwoye (2009) established a valid and precise model to evaluate the concentration of dissolved phosphorus during the leaching of iron oxide ore in oxalic acid solution.
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The behavior of phosphorus in the solid state pre-reduction and dephosphorization treatment processes of high phosphorus iron ore by mechanical crushing and …
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The add-on of dephosphorizing agent is 100kg, 30 minutes dephosphorization treatment time. The sweetening agent proportioning that adopts is: quickened lime 60%, calcium carbide piece 30%,...
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Nov 11, 2020 Phosphorus recovery from dephosphorization slag generated during steelmaking has enormous potential to secure a stable supply of phosphate. Because P and Fe in slag are concentrated in different mineral phases, P can be recovered by separation of the P-bearing phase, and the residue can be reutilized in steel plant at the same time. In the present study, we adopted selective leaching of P ….crushing strength of a cubic meter concrete
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Dephosphorization Treatment of High Phosphorus . Dephosphorization Treatment by Pre-reduction, Mechanical Crushing and Screening Methods The dephosphorization treatment of high phosphorus iron ore before and after get price. Crusher machine for iron ore.
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The precipitation behavior of phosphorus enrichment phase was investigated by slag modification with Al2O3. The mineral phase of the original slag and modified slags were measured by mineral phase microscope, SEM+EDS and XRD. The mechanism of Al2O3 modification was discussed according to the thermodynamic theory analysis software (Factsage version 6.3). The results show that the high ...
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phosphorus in the ore is about 1.18%, which from all indication is quite high and likely to affect adversely the mechanical properties of the steel involved; hence the need for dephosphorization. It was reported [17] that phosphorus can be removed from this iron oxide ore through a process associated with hydrometallurgy. Phosphorus was removed ...
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Nov 27, 2020 Introduction. Dephosphorization is always the major but challenging task in the steelmaking process. CaO-based fluxes are widely used in hot metal pretreatment process and basic oxygen steelmaking process to form dephosphorization slags, which consist of CaO-SiO 2-P 2 O 5-Fe t O-(MgO, MnO, Al 2 O 3, …) systems.mining methods of concrete.Dephosphorization reaction in the steelmaking process and phosphorus …
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Oct 04, 2017 The results show that the dissolution of solid CaO into the multi‐phase slag will be enhanced with the addition of the temperature or the increase of the FeO content, the mass percent ratio of FeO to Fe 2 O 3 (m(FeO)/m(Fe 2 O 3)), and the P 2 O 5 content, while the high basicity (CaO/SiO 2) will restrict the dissolution of solid CaO.
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Jan 30, 2020 Waste concrete is a key component of construction and demolition (C&D) waste produced in billions of tons. Exploring new technology for recycling waste concrete has become a global concern. Meanwhile, phosphorus (P) removal from wastewater consumes lots of natural minerals, leading to a heavy burden on the environment. In this study, the cement paste powder (HCPP) was used to remove phosphorus ...
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The situations of smelting SPHD were analyzed for 150t converter in TangSteel. Based on the analysis of dephosphorization process and the thermodynamic conditions in converter, the operation of dephosphorization was optimized. The industrial tests for dephosphorization were carried out, and the results were analyzed. The results were shown that the distribution coefficient would be the highest ...
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Dec 01, 2010 The high dephosphorization efficiency can be reached at the temperatures ranging from 1 200 to 1 400 C. When the monazite pellets, made by pressing mixture of the monazite, charred coal and water into mould, were roasted at 1 400 C for 2 h, 98% of phosphorus was removed from the monazite pellets.crusher cement machinery.
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In the case of the double slag operation, although steel production became possible, the unit consumption of lime increased to 20 kg/t or more. The obtained results established the high potential of the hot metal dephosphorization process for the treatment of hot metal with high phosphorus content.
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The iron occur in Fe-mineral ores contains impurities of Phosphorus, sulphur and high alkali as well as impregnations of waste rock. To produce a metallurgy treatable concentrate the ore has to be grind for mineral liberation, enriched for concentration and dewatered for transportation.
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Jan 08, 2017 [Process of Enrichment and Culture of PAOs on a Novel Biofilm Process of Dephosphorization]. [Article in Chinese] ... L-1 or less in the reactor,which was operated steadily for 50 d at this treatment level;after 48 d of operation,the reactor's phosphorus uptake rate and release rate were increased from 3.4 mg (L h)-1 and 3.4 mg (L h)-1to 8 ...animasi cement mill manufactur.
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Jun 01, 2020 Waste concrete is one of the largest contributors to solid waste, but its high value-added utilization is still shortage of economic and effective ways. In this study, the Ca-rich cement mortar (CCM) developed from waste concrete was innovatively used to remove phosphorus from wastewater. The aims of this study were to identify the phosphorus ...
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Apr 01, 2009 JI J. Study on dephosphorization the technology for high-phosphorus iron ore [J]. Mining & Metallurgy, 2003, 12(2): 33–37. (in Chinese) MathSciNet Google Scholar [3] China Environment Protection Bureau. Investigation report on damage and rebuild of ecology & environment in mine development [R].
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Jun 28, 2016 Phosphorus makes steel susceptible to embrittlement during heat treatment and leads to poor electrical properties [5,6].Dephosphorization is favoured by low temperature, high oxygen content in the metal bath and high slag fluidity [8].For this reason IF produced steel is again often taken to other secondary furnaces for purification.ulhasnagar tooth roll crusher processing calcite.
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