Synthesis of alkali metal platinates and their dissolution behavior in hydrochloric acid
Synthesis of alkali metal platinates and their dissolution behavior in hydrochloric acid
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DOI：
10.2109/jcersj2.121.884
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发表时间：
2013-10-01
影响因子：
1.1
通讯作者：
Tai, Yutaka
中科院分区：
文献类型：
--
作者：
Kasuya, Ryo;Miki, Takeshi;Tai, Yutaka
为了减少由于当前使用强酸与氧化剂组合的Pt溶解方法而导致的环境负荷，研究了碱金属铂酸盐在盐酸（HCl）中的合成和溶解。通过在600-800 ℃下在空气中煅烧Pt黑和碱金属碳酸盐（Li、Na、K）的混合物来制备碱金属铂酸盐。通过在600 ℃下煅烧Pt黑和Li 2CO 3的混合物获得Li 2 PtO 3粉末。在600-800 ℃下煅烧Pt黑和Na 2CO 3时，证实了NaPt 3 O 4和Na 2 PtO 3的形成;然而，未反应的Pt也保留在煅烧的样品中。Pt黑和K2 CO 3的煅烧没有产生任何含Pt的氧化物，即使在800 ℃下。这些结果表明，Li 2CO 3是所研究的碱金属碳酸盐中形成碱金属铂酸盐的最活性试剂。所得Li 2 PtO 3在浓HCl中的溶解通过电感耦合等离子体发射光谱法监测。结果表明，Li离子先溶出到HCl中，而Pt离子先溶出到HCl中，随着焙烧温度的降低，金属的溶解度增加。根据晶体的晶粒尺寸和各向异性讨论了Li 2 PtO 3的溶解行为。通过这些铂酸盐的Pt溶解过程预计将有利于建立具有低环境负荷的铂族金属的回收过程。(C)2013年，日本陶瓷协会。All rights reserved.
To decrease the environmental load due to current Pt dissolution processes that use strong acids in combination with oxidizing agents, the synthesis and dissolution of alkali metal platinates in hydrochloric acid (HCl) were examined. The alkali metal platinates were prepared by calcinating mixtures of Pt black and the alkali metal carbonates (Li, Na, K) at 600-800 degrees C in air. Li2PtO3 powder was obtained through the calcination of a Pt black and Li2CO3 mixture at 600 degrees C. The formation of NaPt3O4 and Na2PtO3 was confirmed upon the calcination of Pt black and Na2CO3 at 600-800 degrees C; however, unreacted Pt also remained in the calcined samples. The calcination of Pt black and K2CO3 did not yield any Pt-containing oxides, even at 800 degrees C. These results indicated that Li2CO3 was the most active reagent among the examined alkali metal carbonates for the formation of alkali metal platinates. The dissolution of the resulting Li2PtO3 in conc. HCl was monitored by inductively coupled plasma-optical emission spectrometry. The results showed that Li ions leached into HCl prior to the Pt, and the solubilities of the metals increased with decreasing calcination temperature. The dissolution behavior of Li2PtO3 was discussed based on the crystallite size and anisotropy of the crystal. A Pt dissolution process by way of these platinates is expected to benefit the establishment of recovery processes for PGMs with low environmental loads. (C) 2013 The Ceramic Society of Japan. All rights reserved.