低品位氧化锌矿浸出萃取工艺基础研究-矿物加工工程专业毕业论文.docx

硕士学位论文 摘要
摘要
随着国民经济的发展,易选硫化锌矿和高品位氧化锌矿的逐年消耗,低品位锌矿资源逐渐成为锌冶炼的重要原料,对其进行经济合理的利用己成为一项重要课题。本文针对广西低品位氧化锌矿矿石,从热力学、动力学方面对锌的分离、富集进行理论分析,提出直接浸出一萃取工艺的原则流程,进行浸出与萃取的工艺试验研究。论文的主要研究内容和结果如下:
本文对搅拌浸出和堆浸法进行了对比。搅拌浸出试验研究表明, 硫酸用量和液固比是影响锌浸出率的主要因素,随硫酸用量的增加和液固比的提高,锌浸出率提高;加酸方式、搅拌强度、浸出时间、粒度、反应温度等因素对矿石的浸出也有一定影响。在适宜条件下,锌
%;柱浸9周试验结果表明,锌的浸出率达
%。与搅拌浸出相比,虽然堆浸周期较长,但有杂质浸出率低和酸耗少等优点,适宜处理低品位氧化锌矿。浸出过程热力学分析表明, 氧化锌的酸浸反应属放热反应,酸浸反应平衡数(25℃)×1011, 具有很大的热力学推动力。动力学研究结果显示,该浸出过程属于未反应收缩核模型,由扩散过程控制。
锌萃取条件试验及串级试验表明,以磷酸二(-2一乙基己基)酯
(D2EHPh或P204)为萃取剂,260号煤油作稀释剂研究锌溶剂萃取, 在萃取剂浓度为20%,相比O/h为3:2,萃取10分钟,萃取强度 200r/min,静置分层10分钟时,%;采用三级逆流萃取,%。硫酸可选择性地将有机相中的锌反萃下来,从而实现锌铁分离,富集得到合格的电积液。
关键词氧化锌矿,浸出,萃取
硕士学位论文
AB STRACT
With the depletion of easily processed zinc sulphide ore and hi曲一grade zinc oxide coupled with the rapid development of the economy,low grade zinc has e all important material in the zinc smeltering and the economical utilization of low grade zinc has increasingly e all urgent grade zinc ore is studied in this
paper from the perspectives of thermodynamics and ics in the
separation and enrichment of zinc and a direct 1eaching-extraction process Was basic contents and results were shown as follows:
Agitation leach and heap leach pared in this was shown in agitation leach experiments that the dosages of sulfuric acid and liquid—solid ratio are the main factors influencing zinc leaching yield increases with the increment of sulfuric acid and ratio.
ne acid addition method,agitation intensity,leaching time,particle size
and reaction temperature alSO has influence on the zinc suitable agitation leach yield could reach to %.The colunm leach resuks indicated that the leach yield could reach to %
in nine pared with agitation leach,heap leach iS favorable in the leaching of low grade zinc ore with the advantages of low impurity yield and low acid an