Transformation mechanism of Fe impurities during Fe removal from vein quartz via low-temperature sulfuric acid roasting

IF 5 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2025-09-30 DOI:10.1016/j.mineng.2025.109807

Junjie Zhao , Songjiang Guo , Guangying Zhang , Guangtong Ai , Kuixian Wei , Wenhui Ma

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Abstract

Removing Fe impurities is the key to purifying vein quartz for the production of high-purity quartz sand. However, conventional Fe removal methods suffer from HF contamination and operational complexity, hindering clean and efficient quartz purification. This study investigated the Fe removal efficiency and transformation mechanisms of Fe impurities in quartz using a low-temperature H₂SO₄ roasting followed by water leaching approach. Results indicated that roasting temperature serves as the predominant factor governing Fe speciation evolution during the H₂SO₄ roasting. When the roasting temperature was below 523 K, iron oxides impurities reacted with H₂SO₄ to form water-soluble Fe₂(SO₄)₃. However, increasing the temperature above 523 K resulted in the decomposition of Fe₂(SO₄)₃ into sparingly soluble Fe₁₂O₃(SO₄)₁₅. Thermal motion of H₂SO₄ facilitated the enrichment of the product Fe₂(SO₄)₃ on the surface of quartz during the roasting process. Under conditions of roasting at 523 K and water leaching at 353 K, the content of Fe decreased from 980 μg·g⁻¹ to 12.51 μg·g⁻¹, thereby achieving a removal rate of up to 98.72 %. This study provides a clean and efficient method for preparing high-purity quartz sand using vein quartz.

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低温硫酸焙烧脱脉石英铁过程中铁杂质的转化机理

去除铁杂质是提纯脉石英生产高纯石英砂的关键。然而，传统的除铁方法受HF污染和操作复杂性的影响，阻碍了清洁高效的石英提纯。研究了低温硫酸焙烧-水浸法对石英中铁杂质的脱除效果及转化机理。结果表明，焙烧温度是控制H2SO4焙烧过程中铁形态演化的主要因素。当焙烧温度低于523 K时，氧化铁杂质与H2SO4反应生成水溶性Fe2(SO4)3。当温度升高到523 K以上时，Fe2(SO4)3分解成易溶的Fe12O3(SO4)15。在焙烧过程中，H2SO4的热运动促进了产物Fe2(SO4)3在石英表面的富集。在523 K焙烧、353 K水浸条件下，铁的含量由980 μg·g−1降至12.51 μg·g−1，去除率达98.72%。本研究为利用脉状石英制备高纯石英砂提供了一种清洁、高效的方法。

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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.