Study of the Dissolution Behavior of Muscovite in Stone Coal by Oxygen Pressure Acid Leaching
Study of the Dissolution Behavior of Muscovite in Stone Coal by Oxygen Pressure Acid Leaching
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DOI：
10.1007/s11663-015-0524-6
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Nan-nan Xue;Yi-min Zhang;Tao Liu;Jing Huang
中科院分区：
文献类型：
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作者：
Nan-nan Xue;Yi-min Zhang;Tao Liu;Jing Huang
研究了氧压酸浸过程中白云母在石煤中的溶解行为。研究表明，V、Al和K的溶解行为相似。在氧压酸浸过程中，K最易浸出，Al次之，V次之。当反应温度超过423 K（150℃）时，明矾石生成，由于其吸附性能，导致钒损失。石煤中白云母的溶解主要受h2so4浓度和温度的影响。o2对白云母的溶解没有主要影响，而对V3+的氧化有主要影响。在氧压酸浸过程中，(1)白云母晶格中的界面K迅速溶解，生成新的界面；(2)为了电荷平衡，界面O吸收氢离子形成羟基；(3)界面羟基与氢离子反应，由于O的损失而留下空位，产生更多的新表面，从而暴露出更多的Al、V和Si；(4)界面Al或V被氢离子交换，V3+被氧化为V4+和V5+；(5) Si几乎不与H+反应，生成高Si表面。
The dissolution behavior of muscovite in stone coal during the oxygen pressure acid leaching process was studied. The study showed that the dissolution behaviors of V, Al, and K were similar. K was the most easily leached, followed by Al, and then by V during oxygen pressure acid leaching process. When the reaction temperature exceeded 423 K (150 °C), alunite was generated, which led to vanadium losses because of its absorption performance. The dissolution of the muscovite in stone coal mainly depended on H2SO4concentration and temperature. O2had a main effect not on muscovite’s dissolution but on the V3+oxidation. During the oxygen pressure acid leaching process, (1) the interfacial K in the muscovite lattice was dissolved rapidly, producing a new interface; (2) for charge balance, the interfacial O absorbed hydrogen ions to form hydroxy; (3) the interfacial hydroxy reacted with hydrogen ions and left vacancy as a result of O loss, producing more new surface to expose more Al, V, and Si; (4) the interfacial Al or V was exchanged by hydrogen ions and V3+was oxidized to V4+and V5+; and (5) Si hardly reacted with H+and generated high-Si surface.