The invention provides a palladium refining method with ammonium palladium chloride as raw material. The ammonium chloroparadate is slurried with pure water, added with sodium sulfite after heating up, until there is no red precipitate in the slurried liquid, and filtered after stirring for a certain time, added with sodium chlorate and ammonium chloride after heating up the filtrate, and filtered after stirring to obtain red ammonium chloroparadate precipitate. The ammonium chloroparadate is slurried with pure water, slowly added with analytical pure ammonia water, heated and stirred the slurried liquid until the red chloride in the meat Palladium tetrachloroamino palladium dioxide solution is completely dissolved. The slurry is cooled to room temperature and filtered. Slowly add analytical pure hydrochloric acid to the filtrate to obtain yellow palladium dichloride. Then, slurry with pure water. Add ammonia water under stirring conditions to obtain palladium dichloride solution. Heat it. Slowly add analytical pure water hydrazine under stirring conditions and let it stand for a period of time. Filter it and wash it with hot water After polyester and drying, sponge palladium products are obtained. The invention has the advantages of short process flow, high palladium recovery rate and high purity of palladium obtained.
【技术实现步骤摘要】
一种以氯钯酸铵为原料的钯精炼方法
本专利技术属于冶金
,涉及一种以氯钯酸铵为原料的钯精炼方法。
技术介绍
钯精炼过程通常以二氯二氨络亚钯为起始原料,采用二氯二氨络亚钯法进行精炼。但是,当铂钯混合物中的铂、钯以氯铂酸铵和氯钯酸铵形态存在时,经还原溶解分离铂钯、氧化沉钯后,得到的物料为氯钯酸铵。因此,可将氯钯酸铵经过反复的还原溶解、氧化沉淀进行初步的精炼,然后再采用二氯二氨络亚钯法进行精炼。本专利技术以氯钯酸铵为原料,将氯化铵沉淀法和二氯二氨络亚钯结合起来,可以使海绵钯产品稳定达到99.99%标准。
技术实现思路
一种以氯钯酸铵为原料的钯精炼方法,为以下工艺步骤:(1)还原溶解,将氯钯酸铵用纯水浆化,升温后加入分析纯亚硫酸钠,直至浆化液中无红色沉淀为止,搅拌一定时间后过滤;(2)氧化沉淀,将滤液升温后加入分析纯氯酸钠和分析纯氯化铵,搅拌一定时间后过滤,得到红色的氯钯酸铵沉淀,将上述步骤(1)、(2)重复1~2次后进入下一个步骤;(3)氨溶,将氯钯酸铵用纯水浆化,缓慢加入分析纯氨水至溶液pH值为8~9,将浆化液加热至一定温度,保持温度搅拌一定时间,直至肉红色的氯亚钯酸四氨络亚钯完全溶解,浆化液冷却至室温后过滤;(4)酸化,往滤液中缓慢加入分析纯盐酸至溶液pH值为0.5-1,过滤得到黄色的二氯二氨络亚钯;(5)氨溶,将二氯二氨络亚钯用纯水浆化,在搅拌条件下加入分析纯氨水至溶液pH值为8~9,得到二氯四氨络亚钯溶液,将上述步骤(4)、(5)重复1~2次后进入下一 ...
【技术保护点】
1.一种以氯钯酸铵为原料的钯精炼方法,其特征在于,为以下工艺步骤:/n(1)还原溶解,将氯钯酸铵用纯水浆化,升温后加入亚硫酸钠,直至浆化液中无红色沉淀为止,搅拌反应后过滤;/n(2)氧化沉淀,将滤液升温后加入分析纯氯酸钠和分析纯氯化铵,搅拌反应后过滤,得到红色的氯钯酸铵沉淀,将上述步骤(1)、(2)重复1~2次后进入下一个步骤;/n(3)氨溶,将氯钯酸铵用纯水浆化,缓慢加入氨水至溶液pH值为8~9,将浆化液加热,保温搅拌反应,直至肉红色的氯亚钯酸四氨络亚钯完全溶解,浆化液冷却至室温后过滤;/n(4)酸化,往滤液中缓慢加入分析纯盐酸至溶液pH值为0.5-1,过滤得到黄色的二氯二氨络亚钯;/n(5)氨溶,将二氯二氨络亚钯用纯水浆化,在搅拌条件下加入分析纯氨水至溶液pH值为8~9,得到二氯四氨络亚钯溶液,将上述步骤(4)、(5)重复1~2次后进入下一个步骤;/n(6)水合肼还原,将二氯四氨络亚钯溶液加热,在搅拌条件下缓慢加入分析纯水合肼并静置一段时间,过滤、热水洗涤、真空烘干后得到海绵钯产品。/n
【技术特征摘要】
1.一种以氯钯酸铵为原料的钯精炼方法,其特征在于,为以下工艺步骤:
(1)还原溶解,将氯钯酸铵用纯水浆化,升温后加入亚硫酸钠,直至浆化液中无红色沉淀为止,搅拌反应后过滤;
(2)氧化沉淀,将滤液升温后加入分析纯氯酸钠和分析纯氯化铵,搅拌反应后过滤,得到红色的氯钯酸铵沉淀,将上述步骤(1)、(2)重复1~2次后进入下一个步骤;
(3)氨溶,将氯钯酸铵用纯水浆化,缓慢加入氨水至溶液pH值为8~9,将浆化液加热,保温搅拌反应,直至肉红色的氯亚钯酸四氨络亚钯完全溶解,浆化液冷却至室温后过滤;
(4)酸化,往滤液中缓慢加入分析纯盐酸至溶液pH值为0.5-1,过滤得到黄色的二氯二氨络亚钯;
(5)氨溶,将二氯二氨络亚钯用纯水浆化,在搅拌条件下加入分析纯氨水至溶液pH值为8~9,得到二氯四氨络亚钯溶液,将上述步骤(4)、(5)重复1~2次后进入下一个步骤;
(6)水合肼还原,将二氯四氨络亚钯溶液加热,在搅拌条件下缓慢加入分析纯水合肼并静置一段时间,过滤、热水洗涤、真空烘干后得到海绵钯产品。
2.根据权利要求1所述的一种以氯钯酸铵为原料...
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