钼精矿氧压水浸渣碱性浸出工艺研究  

Research on alkaline leaching for oxygen pressure water leaching residue of molybdenum concentrate

作　　者：王恒辉 彭亿龙 仝一喆[1] 刘自亮 何醒民[1] 秦庆伟[2] WANG Henghui;PENG Yilong;TONG Yizhe;LIU Ziliang;HE Xingmin;QIN Qingwei(Hunan Province Secondary Metal Resource Recycling Engineering Technology Research Center,CINF Engineering Co.,Ltd.,Changsha 410019,China;The State Key Laboratory of Refractory and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]长沙有色冶金设计研究院有限公司湖南省再生金属资源循环利用工程技术研究中心,湖南长沙410019 [2]武汉科技大学钢铁冶金及资源利用教育部重点实验室,湖北武汉430081

出　　处：《中国有色冶金》2024年第5期23-30,共8页China Nonferrous Metallurgy

基　　金：广西科技计划项目(桂科AA22068076);湖北省揭榜制科技项目(2020BED026)。

摘　　要：氧压水浸工艺处理辉钼矿,钼回收率达95%以上,此工艺中,采用氨水浸出氧压水浸渣会导致氨浸渣中存在部分难溶钼酸盐,降低了钼回收率。本文尝试采用NaOH或Na_(2)CO_(3)为浸出介质对氧压水浸渣进行浸出实验,考察浸出剂用量、温度、液固比及浸出时间等参数对钼浸出率的影响,并结合浸出渣的物相组成和热力学分析阐明浸出过程反应机理,得到以下主要结论。辉钼矿氧压水浸渣中含有CaMoO_(4)这一物相,采用NaOH浸出时,无法有效将CaMoO_(4)中的Mo浸出,但Na_(2)CO_(3)浸出时,在温度20℃以上,即可自发实现CaMoO_(4)的分解,且温度越高,分解越容易;采用Na_(2)CO_(3)作为浸出剂时,最佳工艺条件为浸出温度90℃、Na_(2)CO_(3)用量系数1.2、液固比4∶1、浸出时间90 min、搅拌转速400 r/min,此条件下钼浸出率为97.15%;采用NaOH作为浸出剂,最佳工艺条件下的浸出率为93.98%。试验结果表明,采用Na_(2)CO_(3)作为浸出剂可有效提升钼的浸出率。Molybdenum recovery ratecanbeover 95%in the treatment of molybdeniteby oxygenpressure and water leaching process.Subsequently,ammonia leachingofoxygen pressure and water leaching residue will lead to the presence of some insoluble molybdate in the ammonia leaching residue,which decrease the recovery of molybdenum.Oxygen pressure and water leaching residue of molybdenum concentrate as raw material with NaOH and Na_(2)CO_(3)as leaching agents,the effects of leaching agent dosage,temperature,liquid⁃solid ratio,and leaching time on molybdenum leaching rate were investigated in this paper.The chemical composition analysis of oxygen pressure and water leaching residue and alkaline leaching residue were analysed to reveal the mechanism of alkaline leaching of oxygen pressure and water leaching residue.Results show thatthe oxygen pressure and water leaching residue contains CaMoO_(4),which cannot be effectively leached by NaOH.In case of using Na_(2)CO_(3)as leaching agent,spontaneous decomposition of CaMoO_(4)occurs at temperature above 20℃,and the higher the temperatureis,the easier the decomposition is.The optimum conditions for using Na_(2)CO_(3)as leaching agent are temperature of 90℃,Na_(2)CO_(3)consumption coefficient of 1.2,liquid⁃solid ratio of 4∶1,time of 90 minutes,and stirring speed of 400 rpm,in which,the molybdenum leaching rate can reach 97.15%.Under the optimum conditions for using NaOHas leaching agent,themolybdenum leaching rateis 93.98%。Results indicatethat the leaching rate of Mo canbe effectively increased by usingNa_(2)CO_(3)as leaching agent.

关 键 词：钼精矿 氧压水浸渣 碱性浸出 NaOH浸出 Na_(2)CO_(3)浸出 CaMoO_(4)分解 热力学分析 

分 类 号：TF841.2[冶金工程—有色金属冶金]