Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第11期    总第224期    2017年11月

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文章编号:1004-0609(2017)-11-2363-07
增氧条件下的碱性硫脲浸金实验
白安平,宋永胜,李文娟,屈 伟

(北京有色金属研究总院 生物冶金国家工程实验室,北京 100088)

摘 要: 碱性硫脲浸金需要用氧化剂来调节溶液的氧化电势,氧化剂的氧化电势既要大于金溶解形成Au[CS(NH2)2]2+的电势(0.38 V),由于电势太高硫脲易被氧化而失效,故氧化剂的氧化电热不能太高。在碱性溶液中,氧的标准电极电势为0.40 V,因此,理论上空气中氧是理想而经济的氧化剂。然而,水的饱和溶氧量小,自然溶氧速度慢,从而使氧用作氧化剂受到限制。通过在搅拌浸出槽底部接入螺旋空气管、微孔材料的方法改变发泡方式,进而在持续增氧(空气中氧作氧化剂)的条件下对碱性硫脲浸出低品位金矿石进行具体地研究。发泡方式的改变既增大空气中氧向水中传递的速率,又改善搅拌效果。结果表明:增氧条件下浸出体系的充氧能力越强,碱性硫脲浸金效果则越好。在相同充气量条件下,微孔材料发泡增氧的效果最好,浸出率最高。而且在一定范围内,金浸出率随着充气量的增加而增大,而充气量过大时则会降低金浸出率。

 

关键字: 增氧;碱性;硫脲;浸金

Gold leaching of alkaline thiourea under oxygen supplementation
BAI An-ping, SONG Yong-sheng, LI Wen-juan, QU Wei

National Engineering Laboratory of Biohydrometallurgy, General Research Institute of Nonferrous Metals, Beijing 100088, China

Abstract:During alkali thiourea Au-leaching process, the oxidation potential of the solution is needed to be adjusted by oxidation reagents. The oxidation potential should be higher than 0.38 V, which is the potential for gold to dissolve, and to form Au[CS(NH2)2]2+. However, the thiourea will be decomposed rapidly if the oxidation potential level is too high. In alkaline solution, the standard electrode potential of oxygen is 0.40V, which indicates that theoretically oxygen in the air is an economical oxidant for alkali thiourea Au-leaching system. The use of oxygen as oxidant is negatively impacted due to the low saturation and the slow natural dissolution rate of oxygen in water. The bubble generation type was changed by adding spiral air ducts or microporous material at the bottom of agitating leaching tank, and then the alkali thiourea Au-leaching system for low grade gold ore was studied under the condition of continuous oxygen supplementation (oxygen used as oxidant in the air). The change of bubble generation not only increases the oxygen transfer rate from air to water, but also improves the mixing effect. The test results show that the stronger the oxygenation capacity of the leaching system is, the better the leaching effect of gold with alkaline thiourea will be. Under condition of the same aeration rate, the foaming efficiency of microporous material with the highest leaching rate is the best. Within a certain range, the gold leaching rate increase with the aeration rate increasing, but an extremely high aeration rate will decrease the gold leaching rate.

 

Key words: oxygen supplementation; alkaline; thiourea; gold leaching

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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