Recycling and recycling of three-way catalysts to extract precious metals of platinum, palladium and
The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. The scavenger is actually catalytic, also known as a catalyst.
What works in the catalyst are the platinum, palladium, and rhodium platinum metals coated in it. After the catalyst is used for a period of time, it is scrapped due to the loss of catalytic activity, and the spent catalyst containing platinum and palladium will be used as a precious secondary resource, and the platinum and palladium therein need to be recovered.
In the prior art, the recycling and utilization of waste three-way catalysts mainly adopts pyrotechnic extraction, capture and enrichment of iron group metals, then wet separation of iron nuggets and platinum group metals, and then use the method of fractional extraction to separate platinum group metals step by step. and purification to obtain the corresponding platinum group metal with higher purity.
It is worth noting that the separation and purification of platinum group metals is the key to the recovery process of the three-way catalyst. Because the chemical properties of platinum group metals in solution are very similar and their valence states are variable, their separation and purification has always been one of the difficult problems in metallurgy. The traditional separation process of platinum group metals mainly based on precipitation method and replacement method is lengthy, low yield, high cost, troublesome to operate, and labor-intensive. Solvent extraction technology is recognized by scholars at home and abroad due to its simplified process, good separation effect, high precious metal yield, safe production and operation, greater applicability and flexibility to various materials, large processing capacity, and easy automation. High-tech for separation and extraction of platinum group metals.
At present, some precious metal smelters have partially adopted the extraction and separation process. So, how to extract platinum and rhodium by extraction method? According to the extraction engineer of SUNY GROUP, platinum and rhodium can be extracted from platinum and rhodium feed solution by first extracting platinum and then rhodium. Extraction of platinum adopts the method of extraction and separation. There are many kinds of extractants for extraction and separation. The extraction system prepared by commonly used extractants (such as 100% TBP, N235+n-dodecane+octanol) usually needs to be repeated three to four times. Extraction, the cumulative extraction rate can reach ≥99.5%. The platinum extraction equipment can use extraction tank and centrifugal extractor. The new and efficient extraction equipment developed and manufactured by SUNY GROUP has stable performance and good extraction effect.
Recommend products
CONTACT US:
If you have any requirement or suggestion, please fill in the form and send to us, thanks!E-mail:sunymachine@gmail.com | Whatsapp:+8613674945231
