Carbothermal formation and microstrutural evolution of α′-Sialon–AlN–BN powders from boron-rich blast furnace slag

Jiang, Tao; Wu, Jianrong; Xue, Xiangxin; Duan, Peining; Chu, Mansheng

doi:10.1016/j.apt.2011.05.009

Cited by 23 publications

(5 citation statements)

References 27 publications

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“…Moreover, the B 2 O 3 content in molten slag will decrease further due to the common addition of other fluxing agents, 18) and most boron will convert into the amorphous state in the slag during cooling process, 37,38) which will cause the low activity of the slag and greatly limit the further sustainable utilization of the slag. 39) On the contrary, the low-temperature separation can significantly…”

Section: Mechanism For Boron-iron Separation and Boronmentioning

confidence: 99%

Boron-Iron Separation and Boron Enrichment from Boron-Bearing Iron Concentrate at Low-Temperature Enhanced by Supergravity

Gao

Lan

et al. 2022

ISIJ Int.

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Boron-bearing iron concentrate, as the tailings of boron concentrate otained from ludwigite, still contains more than 5 wt.% of B 2 O 3 , which can hard to be utilized. In this study, low-temperature separation compared with high-temperature melting separation of boron and iron from boron-bearing iron concentrate, and the migration, transformation, separation and enrichment behaviors of boron in both processes were studied. High-temperature melting separation of iron and slag could be accomplished at 1 823 K for 60 min, where the boron mainly distributed in a form of glass phase in the slag with a B 2 O 3 content of 22.69 wt.%, while 0.35 wt.% of [B] was melted into the liquid iron. In contrast, iron and slag were efficiently separated at a low temperature of 1 573 K for 10 min enhanced by supergravity, almost all of boron was enriched into suanite phase in the slag with a significantly higher B 2 O 3 content of 35.61 wt.% and a high recovery ratio of 99.37%, and the content of B was decreased to 0.15 wt.% in the iron. Compared with high-temperature melting separation, low-temperature separation greatly improved the enrichment of boron in slag and avoided the melting of boron into iron.

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Section: Mechanism For Boron-iron Separation and Boronmentioning

confidence: 99%

Boron-Iron Separation and Boron Enrichment from Boron-Bearing Iron Concentrate at Low-Temperature Enhanced by Supergravity

Gao

Lan

et al. 2022

ISIJ Int.

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“…Notable methods included the “blast furnace method”, the “pre-reduction-electric furnace smelting method”, and the “granular iron method” [ 21 , 22 , 23 ]. The blast furnace method entailed smelting sintered boron-bearing iron concentrate in the blast furnace, resulting in boron-containing pig iron (B content: 0.8–1.2%) and boron-rich slag (B 2 O 3 content: 12–17%) [ 21 , 24 ]. The pre-reduction electric furnace smelting method involved agglomerating boron-bearing iron concentrate followed by reduction roasting at 850–1000 °C in the coal-based rotary kiln or gas-based vertical furnace to reduce iron oxide to metallic iron.…”

Section: Introductionmentioning

confidence: 99%

Water Leaching Kinetics of Boron from the Alkali-Activated Ludwigite Ore

Liang,

Hu,

Xiao

et al. 2024

Molecules

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The primary aim of this study was to investigate the boron leaching process from alkali-activated ludwigite ore. Initially, the ore underwent activation through roasting at 1050 °C for 60 min with 20% sodium carbonate. Subsequently, the study examined the influence of leaching parameters, including temperature, time, liquid-to-solid ratio, and particle size, using the activated ore as the raw material. Additionally, water leaching characteristics of the residues and boron kinetics were analyzed. The results demonstrated that boron leaching efficiency reached 93.71% from the reduced ludwigite ore under specific conditions: leaching temperature of 180 °C, leaching time of 6 h, liquid-to-solid ratio of 8:1, and feed particle size of 52.31 μm (average particle size). Leach residue characteristics indicated the dissolution of minerals during the process. The boron behavior during water leaching followed the Avrami Equation, and the kinetics equation was derived by fitting the leaching data. Moreover, the activation energy (Ea) value for boron leaching was determined to be 8.812 kJ·mol−1 using the Arrhenius Equation, indicating that the leaching process is controlled by diffusion.

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“…For the blast furnace process, boron-bearing hot iron and boron-rich slag are produced with high production and separation efficiency. However, the consumption of coke is large, and the generated B 2 O 3 steam seriously corrode the lining of blast furnace. − More importantly, boron-rich slag has low activity boron (<50%), so it still needs further pretreatment before use as feedstock for making borax by the carbon–alkali decomposition method.…”

Section: Introductionmentioning

confidence: 99%

Recycling Excessive Alkali from Reductive Soda Ash Roasted Ludwigite Ore: Toward a Zero-Waste Approach

Zhu

You

Zhang

et al. 2020

ACS Sustainable Chem. Eng.

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During the soda ash calcining of ludwigite ore, sodium magnesium silicates are generated accompanying the activation of boron. This leads to the excessive consumption of soda ash and in turn environmental pollution of an alkali-rich residue. Aiming to reveal the mechanism of alkali recovery, Na 2 MgSiO 4 was synthesized, characterized, and its water leaching behavior was investigated. Thus, a route for the value-added utilization of ludwigite ore was established and verified. For water leaching followed by magnetic separation of reductively soda ash roasted ludwigite ore, 96.97% Na 2 O and 96.86% B 2 O 3 were extracted into the leach liquor at a leaching temperature of 200 °C and a liquid-to-solid mass ratio of 8:1. Subsequently, 95.15% iron was recovered as powdery metallic iron by magnetic separation from the leached residue, while nonmagnetic material consisting of MgO, Mg(OH) 2 , and Mg 2 SiO 4 can be used to prepare magnesia-based refractories.

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Carbothermal formation and microstrutural evolution of α′-Sialon–AlN–BN powders from boron-rich blast furnace slag

Cited by 23 publications

References 27 publications

Boron-Iron Separation and Boron Enrichment from Boron-Bearing Iron Concentrate at Low-Temperature Enhanced by Supergravity

Boron-Iron Separation and Boron Enrichment from Boron-Bearing Iron Concentrate at Low-Temperature Enhanced by Supergravity

Water Leaching Kinetics of Boron from the Alkali-Activated Ludwigite Ore

Recycling Excessive Alkali from Reductive Soda Ash Roasted Ludwigite Ore: Toward a Zero-Waste Approach

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