Rhodium powder recycling: technology and methods for recycling waste rhodium powder

Rhodium is a precious Platinum group with good corrosion resistance and chemical stability, and is widely used in industry, medicine, environmental protection and other fields. However, as the demand for rhodium continues to increase, its price also continues to rise. In order to reduce costs and protect the environment, the recycling and utilization of waste rhodium powder has become an important means. The following will introduce several technologies and methods for recycling waste rhodium powder.

1、 Chemical recovery

Chemical recovery is a method of converting waste rhodium powder into reusable compounds or metals through chemical reactions. Among them, rhodium oxidation method is a commonly used chemical recovery technology. The basic principle of this method is to dissolve waste rhodium powder in hydrochloric acid, add excess hydrogen peroxide, and oxidize it into Rh (III) ions; Then it is reduced to Rh metal through reducing agent (such as Sodium sulfite). This method has the advantages of low cost, simple operation, and high efficiency, but the generated waste liquid needs to be treated subsequently to avoid environmental pollution.

2、 Physical recovery

Physical recovery is a method of separating waste rhodium powder through physical means. Among them, centrifugation is a commonly used physical recovery technology. The basic principle of this method is to mix waste rhodium powder with centrifuge solution, and then separate it through high-speed centrifugation. Due to the high density of rhodium powder, it can be separated by centrifugation. This method has the advantages of high separation efficiency and simple operation, but it has certain requirements for the shape and size of waste rhodium powder.

3、 Recovery by roasting method

Roasting recovery is a method of converting waste rhodium powder into metallic rhodium or rhodium oxide at high temperatures. Among them, high-temperature reduction method is a commonly used roasting method for recovery technology. The basic principle of this method is to mix waste rhodium powder with a reducing agent, and then heat it at high temperature to reduce it to metallic rhodium or rhodium oxide. This method has the advantages of high product purity and simple operation, but it requires a large amount of energy consumption and has high requirements for equipment and environment.

4、 Electrochemical recovery

Electrochemical recovery is a method of reducing waste rhodium powder to metallic rhodium using electrochemical principles. Among them, electrolytic reduction method is a commonly used electrochemical recovery technology. The basic principle of this method is to dissolve waste rhodium powder in the electrolyte, and then reduce it to metallic rhodium through the action of an electric current. This method has the advantages of high recovery efficiency and simple operation, but it has certain requirements for the selection of electrolyte and electrode materials, and requires a certain amount of electrical energy consumption.

There are multiple options for the recovery technology and methods of waste rhodium powder, and suitable methods can be selected according to different needs and actual situations. At the same time, the recycling and utilization of waste rhodium powder can not only reduce costs, but also protect the environment and resources, which has important economic and social significance.

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