铂催化剂的回收

湿法冶金

72卷第3-4期 2004年3月，页179-184

从废催化剂中回收铂金

∙MA巴拉卡特，

∙MHH马哈茂德，

∙由中冶R＆D研究所，邮政信箱，87，赫勒万11421，开罗，埃及

∙/10.1016/S0304-386X（03）00141-5，如何来引用或链接使用DOI

∙关键词：

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抽象

从氨的制造过程中的硝酸是一个缓慢的损失的催化铂纱布。这种细小的灰尘，其中包含13.7％的Pt，1.3％Rh和其它杂质，如铁的氧化物和二氧化硅，淀积上的内部反应器壁和冷却盘管。

的灰尘，用王水回流1.5小时的液/固比为7.5，以增溶铂为随后的恢复。铂金浸出液中直接沉淀

在煤油溶剂萃取法三辛胺分离。在这两种情况下，回收的铂作为二铵六氯铂酸，通过沉淀，使用氯化铵。沉淀物分解产生铂粉末，纯度为97.9％和99.9％，直接和SX航线，分别由点火。铂回收率为97.5％，实现两条路线。

关键词

∙恢复 ;

∙铂金 ;

∙催化剂

从这篇文章中的图和表：

图。1。从灰尘对铂金的回收工艺流程。

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图。（2）浸出试验。（一）铂金回收与浸出时间，液/固比= 25，在109°C。（b）对回收铂液/

固比，时间= 2小时，在109°C。（C）温度的影响，铂金回收，液/固比= 10，时间为2小时。

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图。3，作为一个功能的NH

4 Cl /铂的铂降水。

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图。4。铵六氯点火过程中的质量损失，在不同的温度下。

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图。5， HCl浓度的影响上的Pt（Ⅳ）和Fe（III）与10％的TOA煤油萃取。

图选项表1中。铂粉尘的化学分析

;

表2中。通过沉淀产生的铂粉的化学分析

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Hydrometallurgy

Volume 72, Issues 3–4, March 2004, Pages 179–184

Recovery of platinum from spent catalyst

∙M.A Barakat,

∙M.H.H Mahmoud,

∙Central Metallurgical R&D Institute, P.O. Box, 87, Helwan 11421, Cairo, Egypt

∙/10.1016/S0304-386X(03)00141-5, How to Cite or Link Using DOI

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Abstract

During the manufacture of nitric acid from ammonia there is a slow loss of catalytic platinum gauze. This fine dust, which contains 13.7% Pt, 1.3% Rh and other impurities such as iron oxide and silica, is deposited on the internal reactor walls and cooling coils. The dust was refluxed with aqua regia at a liquid/solid ratio of 7.5 for 1.5 h to solubilise platinum for subsequent recovery. Platinum was separated from the leach liquor by direct precipitation and by solvent extraction using trioctylamine in kerosine. In both cases the platinum was recovered as diammonium hexachloroplatinate by precipitation using ammonium chloride. The precipitate was decomposed by ignition to produce platinum powder with purity of 97.9% and

99.9% for direct and SX routes, respectively. A platinum recovery of 97.5% was achieved by

both routes.

Keywords

∙Recovery;

∙Platinum;

∙Catalyst

Figures and tables from this article:

Fig. 1. Process flowsheet for platinum recovery from the dust.

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Fig. 2. Leaching tests. (a) Platinum recovery vs. leaching time, liquid/solid ratio=25 at 109 °C. (b)

Effect of liquid/solid ratio on platinum recovery, time=2 h at 109 °C. (c) Effect of temperature on

platinum recovery, liquid/solid ratio=10, time=2 h.

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Fig. 3. Precipitation of platinum as a function of NH4Cl/Pt.

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