摘要
针对传统王水溶解—氯化铵反复沉淀法精炼铂工艺中存在的不足展开研究,考察不同还原剂及其浓度对粗氯铂酸铵中铑、铱去除率的影响,研究了无需蒸干的脱硝工艺并尝试量化脱硝终点。结果表明,采用10%水合肼+5%盐酸对粗氯铂酸铵中铑、铱的一步去除率较高,一步铑去除率达91.18%,铱去除率达95.88%;采用40%酒精+8%尿素溶液脱硝时间仅为1.3 h,脱硝用时缩短89.2%以上,并且烧损合格率达到95%以上,为最佳的脱硝工艺,可以将溶液电位590~600 mV作为脱硝终点的判断依据。该工艺应用后,海绵铂的精炼周期缩短约75%,铂的直收率提高0.26个百分点,可稳定产出合格的高纯海绵铂,具有良好的推广应用价值。
The shortcomings of the traditional platinum refining process of aqua regia solution-ammonium chloride precipitation were studied.The effects of different reducing agents and their concentrations on removal rate of rhodium and iridium in crude ammonium chloroplatinate were investigated.The denitrification process without evaporation was studied and the end point of denitrification was tried to quantify.The results show that the removal rate of rhodium and iridium in crude ammonium chlorplatinate by using 10%hydrazine hydrate and 5%hydrochloric acid is higher,and the one-step removal rate of rhodium and iridium can reach 91.18%and 95.88%respectively;The denitration time of 40%alcohol+8%urea solution is only 1.3 h,the denitration time is shortened by more than 89.2%,and the qualified rate of burning loss is more than 95%,which is the best denitration process.The solution potential of 590-600 mV can be used as the judgment basis of denitration end point.After the application of this process,the refining cycle of sponge platinum is shortened by about 75%,the direct yield of platinum is increased by 0.26 percentage points,and qualified high purity sponge platinum can be produced stably,which has a good value of popularization and application.
作者
李绍伟
潘从明
李生民
高向乾
王得瑜
李进武
刘发存
杨晓真
LI Shaowei;PAN Congming;LI Shengmin;GAO Xiangqian;WANG Deyu;LI Jingwu;LIU Facun;YANG Xiaozhen(Jinchuan Group Copper Co.,Ltd.,Jinchang 737100,Gansu,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2023年第10期64-69,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2018YFC1901604)。
关键词
还原除杂
高效脱硝
海绵铂
铂精炼
removal of impurities by reduction method
efficient denitration
sponge platinum
platinum refining
