Silver slurry recycling: detailed introduction to the characteristics and uses of silver slurry

Silver slurry is a viscous liquid containing small silver powder particles, which has high conductivity, good adhesion, and environmental friendliness. Silver powder particles are usually made by mixing silver powder with polymer matrices, solvents, and other additives (such as dispersants, stabilizers, etc.). After drying, this slurry forms a continuous conductive network between silver powder particles, which gives it good conductivity. Silver slurry is widely used in fields such as electronics, solar energy, automobiles, and healthcare. Common applications include electronic circuits, touch screens, radio frequency identification (RFID) antennas, solar cells, automotive sensors, and more. Due to its superior conductivity and environmental friendliness, silver slurry has enormous application prospects in fields such as new energy and intelligent electronic devices. This article will provide a detailed introduction to silver paste from two aspects: its characteristics and uses.

1、 Characteristics of Silver Paste

1. High conductivity: Silver slurry is a slurry material composed of micrometer sized silver powder, organic solvents, and adhesives. Due to the high conductivity of silver, silver paste also has considerable conductivity. This has led to the widespread application of silver paste in the electronics industry, such as in the production of conductive adhesives, contact materials, etc. 2. Good adhesion: The adhesive in the silver slurry can tightly adhere the silver powder to various substrate surfaces, forming a dense silver film. This characteristic enables silver paste to have good adhesion in various process fields, such as for making solar cells, printed circuit boards, etc. 3. Environmental friendliness: Compared with other conductive materials containing harmful substances, silver slurry is an environmentally friendly material because its main component - silver - is harmless to the human body and the environment. This has attracted increasing attention to silver slurry in the field of green manufacturing. 4. Plasticity: Silver slurry has good plasticity and can form conductive silver films on substrates of various shapes and sizes through various methods such as coating, printing, and spraying. This makes silver slurry have broad application prospects in fields with high design flexibility requirements.

2、 The Use of Silver Paste

1. Electronics industry: Due to the high conductivity and good adhesion of silver paste, it has been widely used in the electronics industry. For example, used for making conductive adhesives, contact materials, printed circuit boards, etc. 2. Solar energy industry: In the manufacturing process of solar cells, it is necessary to coat a layer of conductive silver film on the silicon surface to improve the Solar-cell efficiency of the cells. The high conductivity and good adhesion of silver paste make it widely used in the manufacturing of solar cells. 3. Automotive industry: In the automotive industry, silver paste is used to produce conductive layers for automotive sensors, electronic devices, and automotive components. In addition, with the popularization of electric vehicles, the demand for efficient conductive materials is also increasing, and silver slurry has great application prospects in fields such as new energy vehicle batteries. 4. Medical field: The application of silver slurry in the medical field is mainly reflected in aspects such as biosensors and medical electrodes. Due to the excellent antibacterial properties of silver, silver slurry can also be used to make antibacterial materials, which helps improve the safety performance of medical devices. 5. Aerospace field: The application of silver slurry in the aerospace field includes the production of conductive films, antibacterial coatings, etc. Due to its high conductivity and good adhesion, silver paste has high performance requirements for its application in aerospace equipment.

3、 Common methods for recovering silver slurry

1. Chemical reduction method: Chemical reduction method is a method of reducing silver ions in silver slurry to metallic silver through chemical reactions. In this method, reducing agents (such as Sodium nitrite, methanol, etc.) are used to react with waste silver slurry to generate metallic silver precipitation. Then, through steps such as filtration, washing, and drying, high-purity metallic silver powder can be obtained. 2. Electrolysis method: Electrolysis method is a method of using current to precipitate silver ions in the silver slurry at the anode. This method requires mixing the discarded silver slurry with the electrolyte, and then under the action of an electric field, the silver ions move towards the anode to precipitate metallic silver. Through this method, high-purity metallic silver can be obtained, and other valuable components in waste silver slurry can also be recovered. 3. Ultrasonic separation method: Ultrasonic separation method utilizes the cavitation effect and mechanical vibration of ultrasound to separate silver particles from other components in waste silver slurry. Put the waste silver slurry into an ultrasonic treatment device, and through the action of ultrasound, silver particles can be separated from the waste silver slurry. Furthermore, through steps such as filtration and washing, high-purity metal silver powder can be obtained. 4. Incineration method: The incineration method involves placing waste silver slurry into a high-temperature furnace, and using high-temperature incineration to decompose and volatilize the organic matter, leaving behind metallic silver. Subsequently, high-purity metallic silver can be recovered through steps such as cooling, filtration, and washing. However, this method will generate a large amount of harmful gases, and corresponding treatment measures need to be taken to reduce environmental pollution.

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