A method for recycling lead-free solder through α-sn phase transition separation
A lead-free solder, separation and recycling technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of high energy consumption, low recycling rate, and large pollution, and achieve low energy consumption, recycling High rate, low pollution effect
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Embodiment 1
[0017] Separation and recovery of lead-free solder through α-Sn phase transition, the method steps are as follows:
[0018] (1) Cold rolling the solder alloy that needs secondary recovery to a thickness of 1-10mm; the solder alloy refers to a Sn alloy containing Ag, Cu, Zn, Al and other impurity elements, wherein the content of each impurity element does not exceed 5wt.%. ;
[0019] (2) Cool the metal plate cold-rolled in step (1) to below -13.2°C, and spray powdered α-Sn on the surface of the metal plate; the α-Sn can be obtained through phase transformation of pure Sn in low-temperature refrigeration, or Obtained through follow-up process (5) separation;
[0020] (3) further cooling the metal plate to -33°C to complete the α-Sn phase transition of the metal plate; during the α-Sn phase transition of the metal plate, the α-Sn phase transition can be accelerated by thermal cycling; the thermal cycle, It is to adjust the temperature between -15°C and -33°C during the freezing...
Embodiment 2
[0024] Separation and recovery composition is the lead-free solder of Sn-3Ag-0.5Cu by α-Sn phase change, and its method step is as follows:
[0025] (1) Cold rolling the lead-free solder whose composition needs secondary recovery is Sn-3Ag-0.5Cu to a thickness of 1 to 10 mm; said cold rolling refers to rolling the raw alloy ingot at room temperature using a rolling mill, according to Metal ingot size, can be rolled many times;
[0026] (2) Cool the metal plate cold-rolled in step (1) to below -13.2°C, spray powdery α-Sn on the surface of the metal plate, the particle size of powdery α-Sn is 5 μm, and the spraying amount is 2g / m 2 ; The α-Sn can be obtained through the phase transition of pure Sn in low-temperature refrigeration, and can also be separated and obtained through the subsequent process (5);
[0027] (3) Further lower the temperature of the metal plate to -33°C, and then adjust the temperature to cycle between -15°C and -33°C. One hour is a cycle. After 48 hours, t...
Embodiment 3
[0031] Separation and recovery composition is the lead-free solder of Sn-3Ag-0.5Cu by α-Sn phase change, and its method step is as follows:
[0032] (1) Cold-roll the lead-free solder whose composition needs to be recovered twice to be Sn-3Ag-0.5Cu to a thickness of 1-10mm;
[0033] (2) Cool the metal plate treated in step (1) to below -13.2°C, spray powdery α-Sn on its surface, the particle size of powdery α-Sn is 5 μm, and the spraying amount is 2g / m 2 ;
[0034] (3) Further lower the temperature of the metal plate to -33°C, and place the metal plate at a constant temperature for 60 hours to complete the α-Sn transformation;
[0035] (4) After the α-Sn phase transformation is completed, the metal plate will be broken; use a hammer mill to initially pulverize the broken material, and then go through a jet mill to further pulverize the powder to a particle size of less than 5 μm;
[0036] (5) Separate α-Sn from intermetallic compounds and impurities using a cyclone separator...
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