共查询到15条相似文献,搜索用时 265 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
研究了酸溶法溶解失效Pt/TiO2脱硝催化剂的TiO2载体,进一步富集和回收铂的工艺。结果表明,20% HF+30% HCl对TiO2载体溶解率可达95%,且金属铂基本无分散;系统研究了混酸中HF浓度、反应温度、时间、液固比对载体溶解率的影响;在20% HF+30% HCl为溶剂、反应温度为95℃、反应时间为3 h、体系液固比为10:1的优化条件下,钛载体溶解率达95%以上。对溶解富集物采用传统氯化铵反复沉淀法进行铂精炼提纯,海绵铂纯度≥99.95%,产品质量稳定。 相似文献
10.
11.
用9335型阴离子交换树脂吸附经王水溶解的含钯物料,可以选择性吸附钯,铜、镍等杂质不被吸附。用8%氨水、40 g/L氯化铵解吸,98%以上的钯被解吸。吸附操作简单,解吸后的树脂可重复使用。 相似文献
12.
A leaching process was established based on the ability of platinum-group metals to form stable chloro-complexes in acidic
chloride solutions. Industrial catalyst losses were examined for the recovery of platinum, palladium, and rhodium by leaching
with a mixture of sulfuric acid and sodium chloride to avoid using aqua regia or autoclave conditions. Extraction of platinum
and rhodium in 60% H2SO4 at 135°C steadily increased with increasing NaCl concentrations reaching 95% and 85%, respectively, at 0.1 M NaCl after two
hours. By comparison, palladium was dissolved more quickly but also reached 85% under the same conditions. Extraction of each
metal increased with temperatures up to 125°C but plateaued at higher temperatures. Similar behavior was observed with increasing
H2SO4 concentrations up to 60%. More than 99% extraction of each metal was obtained after ten hours using 0.1 M NaCl and 60% H2SO4 at 125°C.
For more information contact Mohamed Hesham Hassan Mahmoud in the Extractive Metallurgy Department, Central Metallurgical
R&D Institute, P.O. Box 87, Helwan, Cairo, Egypt; (202)5010642, Ext. 213; Fax (202)5010639; e-mail mheshamm@hotmail.com 相似文献
13.
14.