Recovery and Purification of Platinum, Palladium and Rhodium Containing Waste

• Main Authors: CHEN,CHIN-TING, 陳勁廷
• Other Authors: LEE,CHING-HWA
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3p5529

碩士 === 大葉大學 === 環境工程學系研究所 === 106 === This study is to recover and purify the valuable platinum (Pt), palladium (Pd), and ruthenium (Rh) metals from Pt-Pd-Rh containing waste, The main tasks of this study including collection of Pt-Pd-Rh containing waste, composition analysis, grinding and sieving, leaching, recovery and purification. According to the results of this study, the total contents of Pt, Pd and Rh metals in collected are 5775 mg/kg for Pt, 11850 mg/kg for Pd and 2125 mg/kg for Rh respectively. After grinding for 15 mintues, the sample contains about 99.9% of particle size of less than 100mesh (0.149mm). Also, the collected sample has water, ash and combustible content of 1.34%, 88.65%, 9.97%, respectively. The leaching testing results reveals that 100% leaching recovery of Pt and Pd and 87% leaching of recovery of Rh can be obtain under the optimal leaching conditions (10N hydrochloric acid, 3g/50ml, 10ml hydrogen peroxide, 70 °C, 2hr). The testing result of the ammonium chloride precipation of Pt-Pd-Rh containing leaching solution shows that 93% of the Pt is precipitated into the ammonium chloroplatinate product together with 16% precipation of Pd and 16% precipation of Rh under the optimum precipitation conditions (40 ml of the optimal Pt-Pd-Rh containing leaching solution, 2g of sorbitol, 2g of ammonium chloride, 70 °C). The obtained ammonium chloroplatinate product product was roased at 750°C for 3 hours to obtain a sponge Pt product. 100% Pt, 97% Pd and 46% Rh of the obtained Pd-Rh containing filtrate can be absorbed by using an anion exchange resin (JET4200). The Pd absorbed exchange resin is then subjected to a hydrochloric acid backwash, and then the obtained Pd containing backwash liquid is crystallized to obtain a Pd chloride crystal product. On the other hand, the Rh-containing filtrate obtained after the anion exchange (JET4200) was crystallized to obtain a rhodium chloride crystal product.