Preparation of cubic manganese carbonate by hydrothermal method and its application in extraction of lithium
The micro-morphology of the adsorbent has a significant effect on its dispersion and adsorption behavior in solu-tion.The manganous lithium adsorbent with controllable morphology and uniform particle size was prepared by hydrothermal synthesis of cubic MnCO3 as a self-template.Using potassium permanganate,sucrose,and tartaric acid as raw materials,the effects of reactant concentration,solution pH,hydrothermal temperature,and hydrothermal time on the morphology of cubic MnCO3 and the crystal structure and adsorption capacity of the corresponding adsorbent were investigated.The results showed that the optimum conditions for preparing cubic MnCO3 by the hydrothermal method were as follows:the optimal re-actant concentration was 7.406 2 g/L(in KMnO4),LiOH·H2O solution was used as pH regulator to adjust the pH of the reac-tion solution to 3.00,the hydrothermal temperature was 120 ℃ and the hydrothermal time was 36 h.Under the optimal hy-drothermal conditions,the maximum adsorption capacity of the corresponding C-HMO for Li+was 50.62 mg/g,the adsorp-tion capacity was stable above 38.50 mg/g and the desorption rate of Li+was above 80％in 5 adsorption-desorption cycles.X-ray diffractometer(XRD),scanning electron microscope(SEM),and synchronous thermal analyzer(TGA-DSC)were used to characterize the MnCO3 prepared under optimal hydrothermal conditions.The results showed that the hydrothermal product MnCO3 had a regular cubic structure,the single particle edge length was about 8 μm,the dispersion between the particles was good,the particle size was uniform,the impurity was less,and it had good thermal stability,which was an ideal raw material for the formation of cubic manganese series lithium adsorbent.
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