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| 水溶液氯化法快速溶解纯铑粉 |
| Rapid Dissolution of Pure Rhodium Powder by Aqueous Chlorination |
| 投稿时间：2017-11-09 |
| DOI： |
| 中文关键词: 有色金属冶金 铑粉 溶解 盐酸 氯酸钠 |
| 英文关键词: non-ferrous metallurgy rhodium powder dissolution hydrochloric acid sodium chlorate |
| 基金项目:国家重点研发计划(2016YFB0101309)、云南省应用基础研究计划重点项目(2012FA006)。 |
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| 中文摘要: |
| 采用水溶液氯化法，在盐酸-氯酸钠体系中溶解铑粉，考察了反应温度、酸度、氧化剂用量、时间、液固比等因素对铑溶解率的影响。结果表明，浓盐酸升温至85℃后开始加氯酸钠，酸度为8~9 mol/L，饱和氯酸钠溶液用量为250 mL，液固比为45 mL/g，反应时间2 h，铑粉的一次溶解率达到95%以上。机理探讨认为，充当氧化剂的ClO3-在酸性条件下产生的活性[Cl]，将金属态的铑氧化，并与体系中的Cl-配位形成[RhCl3]3-。 |
| 英文摘要: |
| Aqueous chlorination technique was used to dissolve pure rhodium powder in hydrochloric acid-sodium chlorate system, and the impacts of various factors on the dissolution rate were investigated. These factors included the reaction temperature and time, acidity, amount of sodium chlorate and liquid-solid ratio. The results indicated that, after it had been chlorinated at 85°C for 2 h, the primary dissolution rate of rhodium powder reached more than 95%, when hydrochloric acid was set at 8~9 mol/L and 250 mL of the saturated sodium chlorate solution was added into the dissolving system and the liquid-solid ratio was 45 mL/g. The dissolution mechanism was also explored. It is believed that Rh is oxidized by active chlorine produced from ClO3- in HCl solution and then coordinated with Cl- to form a stable complex [RhCl6]3-. The formation of [RhCl6]3- facilitates the dissolution of rhodium, in return. |
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