CAJ | 학술논문

在对黄铁矿与铝酸钠溶液反应热力学分析的基础上,利用接触角、X 射线衍射、红外光谱和 SEM-EDS等分析手段研究溶出温度和铝酸钠溶液组成对黄铁矿反应行为的影响,并探讨黄铁矿的分解过程.结果表明,黄铁矿的反应速度随溶液温度及游离碱浓度的升高而加快,最终产物主要为 Fe2O3、S2?和 SO42?;拜耳法溶出条件下,反应1 h黄铁矿中硫溶出率高达90%;反应初始阶段黄铁矿表面的Fe2+优先与溶液中的OH?结合生成铁羟基化合物从表面脱落,导致富硫层的形成,随着反应的进行,硫最终以S2?和SO42?形式进入溶液.
재대황철광여려산납용액반응열역학분석적기출상,이용접촉각、X 사선연사、홍외광보화 SEM-EDS등분석수단연구용출온도화려산납용액조성대황철광반응행위적영향,병탐토황철광적분해과정.결과표명,황철광적반응속도수용액온도급유리감농도적승고이가쾌,최종산물주요위 Fe2O3、S2?화 SO42?;배이법용출조건하,반응1 h황철광중류용출솔고체90%;반응초시계단황철광표면적Fe2+우선여용액중적OH?결합생성철간기화합물종표면탈락,도치부류층적형성,수착반응적진행,류최종이S2?화SO42?형식진입용액.
@@@@Based on the thermodynamic analysis of the reaction between pyrite and sodium aluminate solution, the effects of digestion temperature and composition of the sodium aluminate solution on the reaction behavior of pyrite were investigated by the analysis of contact angle, X-ray diffraction, infrared spectrum and scanning electron microscope?energy dispersive spectrum. The decomposition process of pyrite was also discussed. The results show that the reaction rate of pyrite increases with the increase of the temperature and the free caustics concentration in aluninate solution to produce Fe2O3, S2? and SO42? as the main final products. The sulfur dissolution percentage reaches above 90% after reaction of 1 h under the Bayer process. The iron-hydroxyl complexes are generated firstly by the reaction of OH? of sodium aluminate solution and Fe2+of the pyrite surface, then the complexes detach from the surface of pyrite, which leads to a layer of sulfur-rich compounds. Finally, the sulfur enters into the solution in the form of S2?and SO42?.