Strength variation of green pellets and pelletizing mechanism in the pelletization process of vanadium–titanium iron concentrate using organic binders

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-07-19 DOI:10.1016/j.powtec.2025.121434

Kunyu Ma , Shengfu Zhang , Jiahao Zhang , Tianhao Pu , Chen Yin , Mao Chen , Jiating Rao , Chenguang Bai

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Abstract

To enable low-carbon smelting of vanadium‑titanium iron ore in hydrogen-based shaft furnaces, enhancing green pellet performance via organic binders is critical, which improves the iron content and strength of the charged pellets. This work aims to study the effect of pectin, a new organic binder, on the pelletizing properties of vanadium‑titanium iron concentrates (VTIC) compared with traditional binder bentonite and carboxymethyl cellulose (CMC). Optimal binder ratios were determined as 0.2 wt% for pectin and 0.4 wt% for CMC, with corresponding pelletizing times of 11 min and 14 min, respectively. Pectin exhibited superior pelletizing performance. Herein, we analyzed the adsorption and binding mechanism of organic binders during the formation of VTIC green pellets by using the zeta potential, Fourier transform infrared spectroscopy and molecular dynamics. It was found out that pectin exhibited more suitable water absorption properties between VTIC, which contributed to higher strengths of green pellets than those obtained from the CMC. In pelletizing process, both pectin and CMC were adsorbed onto the VTIC primarily by hydrogen bonding involved in the different functional groups. Specifically, carboxyl groups for pectin and hydroxyl groups for CMC. Molecular dynamics simulation results further elucidated these adsorption processes on crystal surface. The negative effect of excessive organic binder concentration on this adsorption process is explained from the perspective of the hydrogen bond energy generated between different interfaces.

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钒钛铁精矿有机粘结剂造球过程中绿球团强度变化及造球机理

为了在氢基竖炉中实现钒钛铁矿石的低碳冶炼，通过有机粘结剂提高绿色球团的性能至关重要，这可以提高带电球团的铁含量和强度。研究了新型有机粘结剂果胶对钒钛铁精矿（VTIC）成球性能的影响，并与传统粘结剂膨润土和羧甲基纤维素（CMC）进行了比较。最佳配比为果胶0.2 wt%, CMC 0.4 wt%，相应的制粒时间分别为11 min和14 min。果胶表现出优异的造粒性能。本文利用zeta电位、傅立叶红外光谱和分子动力学分析了有机粘合剂在VTIC绿色颗粒形成过程中的吸附和结合机理。结果表明，果胶在VTIC之间表现出更合适的吸水性能，这使得绿色颗粒的强度高于CMC。在造粒过程中，果胶和CMC主要通过不同官能团参与的氢键吸附在VTIC上。具体来说，是果胶的羧基和CMC的羟基。分子动力学模拟结果进一步阐明了晶体表面的吸附过程。从不同界面间产生的氢键能角度解释了过量有机粘结剂浓度对吸附过程的负面影响。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.