Influence and optimization of hydrogen-based mineral phase transformation on grinding characteristics of polymetallic oxide and recovery of valuable elements by response surface methodology

IF 5 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2025-09-22 DOI:10.1016/j.mineng.2025.109789

Pengcheng Tian , Peng Gao , Zhidong Tang , Yanjun Li , Yuexin Han

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引用次数: 0

Abstract

The complex polymetallic ore of Bayan Obo is rich in valuable elements, but difficult to utilize. Hydrogen-based mineral phase transformation (HMPT) is an efficient and eco-friendly technology for processing refractory ores. In this study, the process parameters of HMPT were optimized using response surface methodology (RSM). The effects of reaction temperature, reaction time, and H₂ concentration on grinding efficiency, energy consumption, and iron recovery were studied using Box-Behnken Design (BBD). The phase transformation and microstructural characteristics of the ore were analyzed. The results indicate that temperature and H₂ concentration are key factors influencing specific power consumption in grinding and iron recovery rate. Using the characteristic parameter T, which represents the ratio of specific power consumption to iron recovery rate, as the evaluation index, the optimal HMPT conditions were determined: temperature of 500℃, time of 20 min, and H₂ concentration of 30 %. XRD and SEM-EDS analysis results indicate that after HMPT treatment, hematite is more likely to transform into magnetite, and additional cracks appear on the surface of the mineral particles, explaining the improved grinding and separation effects. This provides theoretical guidance for the low-energy consumption and high-efficiency HMPT processing in the industrialization of complex polymetallic ore.

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响应面法优化氢基矿物相变对多金属氧化物磨矿特性及有价元素回收的影响

白云鄂博复杂多金属矿石中有价元素丰富，但开发利用难度大。氢基矿物相变（HMPT）是一种高效、环保的难选矿石处理技术。本研究采用响应面法（RSM）对HMPT的工艺参数进行优化。采用Box-Behnken设计（BBD）研究了反应温度、反应时间和H2浓度对磨矿效率、能耗和铁回收率的影响。分析了矿石的相变和显微组织特征。结果表明，温度和H2浓度是影响磨矿比功耗和铁回收率的关键因素。以表征比功耗与铁回收率之比的特征参数T为评价指标，确定了HMPT的最佳工艺条件：温度500℃，时间20 min， H2浓度30%。XRD和SEM-EDS分析结果表明，HMPT处理后，赤铁矿更容易转变为磁铁矿，矿物颗粒表面出现额外的裂纹，说明了磨矿和分选效果的改善。这为复杂多金属矿低能耗、高效率的HMPT加工产业化提供了理论指导。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.