Coproduction of DRI Powder and Semi-coke from Siderite Ore and Low Rank Coal by Excessive Coal-based Direct Reduction in Rotary Kiln

Luo, Yanhong; Zhu, Deqing; Zhou, Xianlin; Shi, Bengjing; Zhang, Feng

doi:10.2355/isijinternational.isijint-2015-390

Cited by 9 publications

(5 citation statements)

References 12 publications

(11 reference statements)

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“…In the FeO-SiO 2 diagram phase, the Fe 2 SiO 4 phase melts congruently at 1205°C, and it also forms under the eutectic reaction L→FeO+Fe 2 SiO 4 at the eutectic composition of 23 molar % SiO 2 at 1183°C. Besides, Fe 2 SiO 4 also forms via the eutectic reaction L→Fe 2 SiO 4 +SiO 2 at 1185°C at 43 molar % of SiO 2 were it is found in equilibrium with SiO 2 (tridymite) [9]. On the other hand, vanadium can form multiple oxides with different valence states, as can be seen in the V- to the evaporation of H 2 SO 4 retained in the SVC while mass gain could be the result of some oxidation of the compounds in the SVC.…”

Section: Discussionmentioning

confidence: 99%

Microstructural and chemical characterization of stabilized spent vanadium pentoxide catalyst in copper smelting slag

Coronado

Soto

Romero

et al. 2020

Mater. Res. Express

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The purpose of this research is to perform a microstructural characterization of the stabilized spent vanadium pentoxide (V 2 O 5 ) catalyst in the copper smelter slag. The spent V 2 O 5 catalyst (SVC) is a discarded material from a sulfuric acid production plant. The used SVC is a catalyst material supported in SiO 2 . The used copper smelting slag (CSS) was from a copper refining mine. The toxic V 2 O 5 compound present in the SVC was stabilized via pyrometallurgical processing with the CSS in an electric furnace with a CSS/SVC 4:1 ratio at 1250°C to obtain a fused compound. The microstructural and chemical characterization of the CSS, SVC used materials and the obtained fused compound, were performed by scanning electron microscopy (SEM) coupled and Energy dispersed X-ray analyser (EDS), X-ray powder diffraction (XRD) and Differential Thermal Analyser (DTA-TGA). The fused compound was a complex slag that comprised of Fe 2 SiO 4 and FeVO 4 phases.

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Section: Discussionmentioning

confidence: 99%

Microstructural and chemical characterization of stabilized spent vanadium pentoxide catalyst in copper smelting slag

Coronado

Soto

Romero

et al. 2020

Mater. Res. Express

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“…1. 5 Siderite lump was charged into a pilot scale rotary kiln of φ 1000 × 500 mm for reduction, and the amount of coal required for reduction was determined by the designed C/Fe ratio. The reduction was kept at a certain temperature for some time.…”

Section: Methodsmentioning

confidence: 99%

“…4 Based on the abundant refractory iron ores and inferior coal resources in China, a new concept was proposed to coproduce DRI concentrate and high carbon semi-coke in one process from low grade siderite ore and low rank coal in rotary kiln. [5][6][7] In the process, the superfluous dosage of reductant was intentionally applied for the direct reduction of iron ore. In traditional coalbased direct reduction of iron oxides, the dosage of reductant is required as less as possible to reduce the energy consumption and material cost (C/Fe is generally around 0.6).…”

Section: Introductionmentioning

confidence: 99%

“…The majority carbon involves in the gasification after pyrolysis to provide CO for iron oxides reduction, so the ash dominates the non-magnetic products with less value. While in this process, 5 the C/Fe mass ratio is intentionally superfluous to recover the iron and carbon simultaneously. The excessive coal dosage could provide strong reduction atmosphere for iron ore reduction and avoid the local oxidative exothermic reaction that causing the ring formation in rotary kiln.…”

Section: Introductionmentioning

confidence: 99%

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Utilisation of semi-coke as by-product derived from coal-based direct reduction process in iron ore sintering

Luo

Zhu

Pan

et al. 2016

Ironmaking & Steelmaking

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Solid wastes derived from metallurgical industries have created threats to the environment and their disposal is a major concern for the World. Semi-coke generated in the coal-based direct reduction process of iron ore is a solid waste and its effective utilisation has not been developed so far. In order to develop it properly, the characteristics of this semi-coke have been comprehensively studied and an investigation was carried out into the use of semi-coke as an alternative fuel in iron ore sintering. It is shown that the semi-coke could be substituted for coke breeze without affecting the sintering and metallurgical performances by adjusting its size distribution to offset the adverse effect of its superior combustion properties. In addition, the application of semi-coke in sintering could decrease SO x and NO x pollutants by 66 and 25%, respectively, in waste gas compared with coke breeze as solid fuel.

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“…Fayalite is a Si-rich iron oxide containing 70.57% FeO and 29.43% SiO 2 (Asrar and Thakur, 1995). (Luo, et al, 2016).…”

Section: Silicon Oxidationmentioning

confidence: 99%

Influence of Chemical Composition on the Hot Oxidation of Carbon Steel – A Review

Carvalho,

Matlakhova,

Monteiro

2024

JER

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Coproduction of DRI Powder and Semi-coke from Siderite Ore and Low Rank Coal by Excessive Coal-based Direct Reduction in Rotary Kiln

Cited by 9 publications

References 12 publications

Microstructural and chemical characterization of stabilized spent vanadium pentoxide catalyst in copper smelting slag

Microstructural and chemical characterization of stabilized spent vanadium pentoxide catalyst in copper smelting slag

Utilisation of semi-coke as by-product derived from coal-based direct reduction process in iron ore sintering

Influence of Chemical Composition on the Hot Oxidation of Carbon Steel – A Review

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