High-power nanosecond electromagnetic pulses and dielectric barrier discharge in air consequences on structural and structure sensitive properties of ilmenite surface

Author:

Bunin I.,Anashkina N.

Abstract

The paper presents the results of experimental studies on the influence of two types of nonequilibrium electrical discharges (high-power nanosecond electromagnetic pulse (HPEMP) and dielectric barrier discharges (DBD) in air at atmospheric pressure) have on the surface morphology, microhardness, and physicochemical properties of natural ilmenite (Juina deposit of Brazil). Scanning electron microscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), microhardness testing, contact angles of surface wetting, and streaming potentials are used to examine the morphology, defects, chemical composition of ilmenite surfaces, and its structure sensitive properties. Using FTIR, we established, the following possible mechanisms of the nonthermal effect of HPEMP and DBD low temperature plasma irradiation, which modify the structural state of ilmenite surfaces: (i) the transformation (destruction) of the mineral’s crystalline structure; (ii) the electrical disintegration and removal of fine films of iron oxides (hydroxides) from the ilmenite surfaces, and (iii) the subsequent hydroxylation and/or oxidation of Fe2+ to Fe3+ iron ions on the surfaces, due to the effect of the products of microdischarge plasmas. Advantages of using brief energy treatments (ttreat = 10–30 s) to modify the structural-chemical state of ilmenite surfaces and the physicochemical properties of mineral in order to improve the efficiency of processing complex titanium ores are shown. Keywords: ilmenite, high-power nanosecond electromagnetic pulses, dielectric barrier discharge, surface, microscopy, spectroscopy, microhardness, electrokinetic potential, contact angle.

Publisher

Crossref

Reference21 articles.

1. Reznichenko V.A., Averin V.V. and Olyunina T.V., Titanates: Scientific Foundations, Technology, Production. (Moscow: Nauka, 2010).

2. Bogatyreva E.V., Chub A.V. and Ermilov A.G., J. Min. Sci., 50(2), 385, 2014; doi: 10.1134/S1062739114020227

3. Market Overview of Titanium Raw Materials in the CIS. (Moscow: Infomain, 2018).

4. Naifonov T.B., Beloborodov V.I., and Zakharova I.B., Flotation Enrichment of Complex Titanium and Zirconium Ores. (Apatity: Ross. Akad. Nauk, 1994).

5. Nuri O.S., Irannajad M. and Mehdilo A., J. Microwave Power Electromagn. Energy, 51(2), 93, 2017; doi: 10.1080/08327823.2017.1320264

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3