学术
摘 要:
针对高硅天然氧化锌矿常规处理时存在的矿浆难压滤、液固比过小、Zn浸出回收率低等问题，试验探讨了酸度、加酸方式、固液比、粒度及温度因素对锌浸出率的影响。结果表明：固液比1：6时，0．15～O．212mm粒级在常温下与浓度为8％的H2SO4反应120min，锌的浸出率可达96．07％。升高温度，Zn的浸出率可提高至99．02％。浸出过程可用收缩未反应核模型来解释，即浸出率与动力学方程1-（1-α）^1/3～k·t相吻合。浸出动力学显示反应过程中可通过控制矿物表层的扩散来控制反应过程的速率。活化能是控制扩散过程的特征，其值约为6．385kJ／mol。[著者文摘]
文章出处:
《矿冶工程》-2008年28卷1期 -62-66页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
0253-6099（2008）01-0062-05
Kinetics of Sulfuric Acid Leaching of High Silica Low-grade Zinc Oxide Ore
QIN Wen-qing, TANG Shuang-hua, LI Chao （ School of Resource Process and Bioengineering, Central South University, Changsha 410083, Hunan, China）
Abstract:
The effects of the acid value, acid ways, solid-liquid ratio, particle size and reaction temperature on the leaching rate of zinc have been investigated by experiments to solve the problems of difficult filter pressing pulp, low solidliquid ratio and low leaching rate of Zn occurred while routine processing high silica natural zinc oxide ore. The results show that when the solid-liquid ratio is 1：6 and the ores size is 0.15 - 0.212 mm react with H2SO4 of which the concentration is 8% for 120 min at a normal temperature, the leaching rate of zinc can reach 96.07%. The leaching rate of zinc can increase by 99.02% while the temperature raised. The leaching process can be explained by the model of contractibility and unreacted core, that is the leaching rate conforms to the leaching equation 1 - （1 -α）^1/3 - k · t. Leaching kinetics indicate that the rate of the reaction process can be controlled by controlling the diffusion of the mineral layduring the reaction. The activation energy is the character which control the diffusion process and the value of it is aproximately 6.385 kJ/mol.[著者文摘]
Key words:
zinc oxide ore ; sulfuric acid leaching; kinetics
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