One-Step HF-Free Synthesis of Alkali Metal Fluorides from Fluorspar

IF 14.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of the American Chemical Society Pub Date : 2025-02-17 DOI:10.1021/jacs.4c16608

Thomas Schlatzer, Christopher A. Goult, Michael A. Hayward, Véronique Gouverneur

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Abstract

Alkali metal fluorides (MF) are commodity chemicals currently synthesized from naturally occurring fluorite (fluorspar, CaF₂) in two steps: conversion of acid grade fluorspar (AGF) into highly hazardous hydrogen fluoride (HF) followed by neutralization with alkali metal hydroxides/carbonates. Herein, we report a one-step mechanochemical reaction that converts AGF into alkali metal fluorides under basic conditions, bypassing HF. The method consists of reacting AGF with alkali metal (hydr)oxides and titanium dioxide (TiO₂) under mechanical energy for MF formation and in situ sequestration of calcium (hydr)oxide byproducts as calcium titanate (CaTiO₃). Ca²⁺ sequestration prevents reversible CaF₂ formation upon aqueous extraction, thus enabling the isolation of alkali metal fluorides. We also demonstrate that alkali metal titanates (M₂TiO₃) are suitable reagents for both CaF₂ activation and Ca²⁺ sequestration, with K₂TiO₃ being optimal for KF synthesis.

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来源期刊

Journal of the American Chemical Society 化学-化学综合

CiteScore

24.40

自引率

6.00%

发文量

2398

审稿时长

1.6 months

期刊介绍： The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.