Chlorination roasting of zinnwaldite with CaCl2 and CaCO3 for the extraction of Li, K and Rb

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43933655" target="_blank" >RIV/60461373:22310/25:43933655 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0892687525003036" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0892687525003036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mineng.2025.109475" target="_blank" >10.1016/j.mineng.2025.109475</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chlorination roasting of zinnwaldite with CaCl2 and CaCO3 for the extraction of Li, K and Rb

Popis výsledku v původním jazyce

This study investigated alkali metal extraction from zinnwaldite using chlorination roasting with CaCl2 and CaCO3. It was found that increasing the ratio of CaCO3 and zinnwaldite in the roasting mixture up to 3:1 significantly increased the efficiency of alkali metal extraction. The reactions in roasting mixture components occurred below 500 degrees C on the surface of zinnwaldite particles. Decomposition of zinnwaldite and CaCO3 began around 600 degrees C, leading to the formation of new CaO-SiO2-based phases. The maximal extraction of 96 % of Li, 96 % of K, and 100 % of Rb was achieved at 850 degrees C when the mixture of CaCO3/zinnwaldite at the ratio of 4:1 was used with significant volatilization of alkali metal chlorides. The formation of an amorphous glass phase associated with compaction of material above 850 degrees C did not affect the extraction of K and Rb, but it considerably constrained the extraction of Li due to immobilization of its ions in the glassy matrix. The additional limiting factor for Li extraction was the binding of chlorine in stable phases. Adding CaCO3 to the roasting mixture was found to prevent the release of HCl, HF or Cl2 during roasting. Li2CO3 was precipitated from leachate prepared from sinters obtained under the optimal sintering conditions and subsequently recrystallized from demineralized water, achieving battery grade purity of 99.80 %.

Název v anglickém jazyce

Chlorination roasting of zinnwaldite with CaCl2 and CaCO3 for the extraction of Li, K and Rb

Popis výsledku anglicky

This study investigated alkali metal extraction from zinnwaldite using chlorination roasting with CaCl2 and CaCO3. It was found that increasing the ratio of CaCO3 and zinnwaldite in the roasting mixture up to 3:1 significantly increased the efficiency of alkali metal extraction. The reactions in roasting mixture components occurred below 500 degrees C on the surface of zinnwaldite particles. Decomposition of zinnwaldite and CaCO3 began around 600 degrees C, leading to the formation of new CaO-SiO2-based phases. The maximal extraction of 96 % of Li, 96 % of K, and 100 % of Rb was achieved at 850 degrees C when the mixture of CaCO3/zinnwaldite at the ratio of 4:1 was used with significant volatilization of alkali metal chlorides. The formation of an amorphous glass phase associated with compaction of material above 850 degrees C did not affect the extraction of K and Rb, but it considerably constrained the extraction of Li due to immobilization of its ions in the glassy matrix. The additional limiting factor for Li extraction was the binding of chlorine in stable phases. Adding CaCO3 to the roasting mixture was found to prevent the release of HCl, HF or Cl2 during roasting. Li2CO3 was precipitated from leachate prepared from sinters obtained under the optimal sintering conditions and subsequently recrystallized from demineralized water, achieving battery grade purity of 99.80 %.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

MINERALS ENGINEERING

ISSN

0892-6875

e-ISSN

0892-6875

Svazek periodika

231

Číslo periodika v rámci svazku

231

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

nestránkováno

Kód UT WoS článku

001503935900001

EID výsledku v databázi Scopus

2-s2.0-105006875393