文档介绍：SHANDONGUNIVERSITY OF TECHNOLOGY
毕业论文
氰化渣中硫脲浸金实验研究
摘要
论文采用传统的对比试验的方法对碱性环境下硫脲浸取氰化渣中的贵金属金的各种重要的影响因素进行了实验探索和现象讨论,并结合前人的科学研究结果对实验浸取条件进一步明确和精细化。从而得到如下成果:⑴通过不同碱度环境下的实验得出了碱性环境下硫脲浸金的最适宜pH值,从实际生产的角度既提高了金的浸出率又节省了碱度调节药剂的使用量,从而节约成本减少设备腐蚀;⑵通过理论分析,找到了硫脲浸金的反应中的各种反应机理,从而对反应进行优化设计选取了多种稳定剂,并通过试验验证找到了最佳稳定剂硅酸钠和最佳反应用量;⑶立足实际生产通过实验找到了反应速率与反应时间的关系从而加快了工业上的实际生产效率,即在最小的金损失和一定的生产周期情况下提炼到更多的金。⑷根据文献综述已知亚硫酸钠类的物质具有稳定硫脲抑制分解的作用,所以要从这类物质中找到合适的稳定剂和确定稳定剂的最佳用量本文从理论上分析了稳定剂的作用机理,同时通过实验找到了合适的稳定剂和稳定剂的和利用量,本实验已经给出了一直最佳稳定剂及用量。⑸同时本文还对浸金时间和温度进行了实验探究,从而找到了最优化浸金时间和适宜的浸取温度,为了减少资源消耗,浸取温度的选择在工业上有很大的实践意义。
关键词:硫脲浸金,碱性,氰化渣,Na2SiO3
ABSTRACT
This paper expresses the various important influencing factors by experimental exploration and phenomena discussion which adopted the traditional the method of contrast experiment to leach gold by thiourea with cyanide residue in alkaline environment. This paper also makes the experimental leaching conditions more clear and bined with previous research results. And obtained the following results:⑴Through the different alkalinity environment experiments of thiourea leaching of gold this paper get the most suitable pH . From the aspect of actual production, this paper both improve the leaching rate of gold and save the consumption of alkalinity adjusting reagent, thereby save the investment and reduce equipment corrosion;⑵Through the theoretical analysis, this paper found various reaction mechanisms of thiourea leaching reaction , In order to find a bast stabilizer this paper design a variety of response selection of stabilizers, and find the best stabilizer of sodium silicate and optimum dosage by experiments;⑶ This paper find the relationship between the reaction rate and reaction time based on the actual production through experiments and thereby speeding up the industrial actual production efficiency, Get more gold with the smallest gold loss and a shortest production cycle . ⑷From the literature we know that some kinds of material like sodium sulfite can stop the thiourea