Zhejiang Precious Metal Catalyst Comprehensive Refining and Recycling Project

Zhejiang Biotechnology Co., Ltd.: Company Profile

Zhejiang Biotechnology Co., Ltd. specializes in the development and production of precious metal catalysts. By leveraging the strong R&D capabilities and advanced scientific instruments of Zhejiang University of Technology, we have created unique solvent-free catalysts that support multiple reuse cycles. To date, our company has successfully developed dozens of supported precious metal catalysts.

Core Product Portfolio
Our main products include palladium carbon catalysts, palladium alumina catalysts, platinum carbon catalysts, platinum alumina catalysts, ruthenium carbon catalysts, rhodium carbon catalysts, and iridium carbon catalysts.

Broad Application Scope
Furthermore, our products serve a wide range of industries such as pharmaceuticals, pesticides, dyes, fragrances, and liquid crystals. Specifically, they play a key role in catalytic organic synthesis for fine chemicals and exhaust gas treatment.

Authorized Recovery Operations
Additionally, our company holds licenses to recover hazardous waste containing precious metals. This includes spent platinum group metal catalysts, along with waste silver- or gold-containing catalysts and ternary catalysts.

Zhejiang Catalyst Comprehensive Recovery Project

Raw Materials Source
We recover crude platinum, palladium, rhodium, iridium, and ruthenium from spent catalysts.

Refining Process Principles

Palladium Refining
First, we dissolve the palladium and precipitate it. Then, we form an ammonia complex, acidify it to precipitate again, and finally reduce it using hydrazine hydrate.

Platinum Refining
This process begins with dissolution and platinum precipitation, followed by calcination. Subsequently, we carry out hydrolysis and filtration, remove palladium, precipitate platinum again, and then calcine the product.

General Refining Steps
We dissolve the material and then selectively precipitate target metals. After that, we reduce them with formic acid, and finally apply calcination and hydrogen reduction.

Rhodium Refining
First, we leach and distill the ruthenium-containing material while absorbing the product in a hydrochloric acid-ethanol solution. Then, we precipitate ruthenium powder from the absorption liquid. Finally, we calcine it and reduce it with hydrogen.

Iridium Refining
We start by separating impurities through alkali fusion and then dissolve the material in aqua regia. Next, we perform oxidation precipitation and re-dissolve the material in aqua regia. Afterwards, we remove additional impurities using sulfide, followed by oxidation precipitation and calcination reduction. In the final stage, we calcine and cool the product to obtain iridium oxide powder.