The basic principle of palladium-carbon recovery technology is that palladium in wastewater is adsorbed by activated carbon and then dissociated from activated carbon through chemical reaction. Specifically, the technology is divided into four steps: adsorption, desorption, reduction and purification.
In the adsorption stage, activated carbon material is used as adsorbent to adsorb palladium in wastewater to its surface. The key of this step is to select suitable activated carbon materials to ensure efficient adsorption and recovery.
In the desorption stage, the adsorbed palladium element is separated from the activated carbon. This step is usually treated with chemicals (such as acid or sodium hydroxide) to separate palladium from activated carbon.
In the reduction stage, the desorbed palladium element is reduced to metallic palladium. This step is usually treated with reducing agent (such as hydrogen or sodium sulfite) to reduce palladium ions to metallic palladium.
In the purification stage, the reduced palladium metal is purified to remove any impurities. This step usually involves complicated chemical separation technology to ensure that the final recovered product contains high purity palladium.
Palladium and carbon recovery model
Palladium-carbon recovery technology is mainly to separate palladium from waste and recycle it through a series of physical and chemical methods. These methods include heat treatment, chemical reduction, microwave heating and biological reduction. In the heat treatment method, palladium carbon waste is heated to a high temperature, so that palladium metal in it is separated from other substances.
Chemical reduction method uses reducing agent to reduce palladium to metal state. Microwave heating technology uses microwave energy to quickly decompose organic matter in waste, thus separating palladium from other substances. Biological reduction method is to reduce palladium to metal state through the action of microorganisms.
Besides the recovery technology mentioned above, there are many other methods that can be used to recover palladium and carbon. For example, activated carbon adsorption is a common method. This method uses the adsorption of activated carbon to adsorb palladium from solution.
The principle of ion exchange is that palladium ions are adsorbed by ion exchange resin, and then palladium is eluted from the resin with acid or ammonia water. Precipitation method is to separate palladium ions by adding precipitant to generate precipitation. The extraction rule is that palladium is extracted from water phase with extractant, and then reduced to metal state with reductant.
Refer to the above content: Baidu Encyclopedia-Palladium Carbon