Is a carbonate leach for ThO2 possible?

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Carbonate leaches are commonly utilized in uranium chemistry to extract uranium into solution. However, thorium dioxide is known for its high insolubility, only dissolving in hot, concentrated sulfuric acid. The discussion highlights that carbonate leaching is unlikely to work for thorium, as the carbonate complexes primarily involve uranyl VI, while both uranium IV and thorium IV remain insoluble. Since thorium's maximum oxidation state is IV, it confirms that carbonate leaching is not a viable method for thorium extraction.
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Carbonate leaches are often used in uranium chemistry a way to leach uranium into solution. Thorium dioxide is highly insoluble in everything except hot, concentrated sulphuric acid. Would a carbonate leach work for thorium?
 
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As far as I know, the carbonate complexes involve uranyl VI, while both U IV and Th IV are insoluble. For Th, 4 is already the maximal possible oxidation state, so the answer is no.
 
Ah, ok. Thanks.
 

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