Rutile decomposition by sulfuric acid, including the formation of two salts, Ti(SO₄)₂/TiOSO₄, is thermodynamically modelled. It is shown that TiO₂ can spontaneously dissolve in H₂SO₄ solutions. However, titania is considered as an inert (ballast) phase component of titanium-containing raw materials due to the decelerated separate nature of such chemical transformations. It is concluded that the hampered related kinetics of dissolution can be attributed to the lability of Ti(IV) cations/the specific engineered features of the hierarchical crystalline structure. It is suggested that the breaking of Ti–O–Ti bonds without additional mechanical strains in crystal lattice geometry becomes more advantageous when smaller negative anions/fluoride ions can be used. The analysis of sulfate-fluoride extraction leaching of titanium confirmed that a decrease in the Gibbs energy in the presence of F occurs. It is indicated by kinetic research studies that the addition of corrosive sodium reagent (NaF) reduces the activation by 45 kJ/mol, which results in intensification. A mechanism is proposed for the interactions involving the Ti–O–Ti cleavage on the surface/the H₂SO₄-induced Ti dioxide degradation on the sites of defects. Moreover, F acts as a homogeneous/heterogeneous bifunctional catalyst.

中文翻译：

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硫酸反应金红石浸出过程的机理，热力学和动力学

热力学模拟了硫酸金红石分解，包括形成两种盐Ti（SO ₄）₂ / TiOSO ₄。结果表明，TiO ₂可自发溶于H ₂ SO _4。解决方案。但是，由于这种化学转化的减速的分离性质，二氧化钛被认为是含钛原料的惰性（压载）相组分。结论是，溶解相关的动力学受阻可以归因于Ti（IV）阳离子的不稳定性/分层晶体结构的特定工程特征。建议在使用较小的负阴离子/氟离子时，在晶格几何结构中不增加机械应变的情况下破坏Ti–O–Ti键会变得更加有利。钛的硫酸盐-氟化物萃取浸出的分析证实，在F存在下，吉布斯能量降低。动力学研究表明，添加腐蚀性钠试剂（NaF）可使活化降低45 kJ / mol，导致加剧。提出了一种涉及表面/氢原子上Ti-O-Ti裂解的相互作用的机制₂ SO ₄引起的二氧化钛在缺陷部位的降解。此外，F充当均相/非均相双官能催化剂。