A method for flotation separation of copper and tin in waste circuit boards
A waste circuit board and flotation technology, which is applied in solid separation, wet separation, chemical instruments and methods, etc., can solve the problems of high heating methods and methods, toxic and harmful substances in circuit boards, and tin is not easy to melt. , to achieve a significant separation effect, is conducive to separation, reduce the effect of tin content
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Embodiment 1
[0019] The flotation process flow chart of the present embodiment is as figure 1 As shown, it specifically includes the following steps:
[0020] Disposal The waste circuit boards are pyrolyzed at 700°C, and the materials are physically separated to obtain large-particle copper products, iron products, non-metallic products and small-particle copper-tin mixture materials. Wherein the small-particle copper-tin mixture material is mainly copper element and copper-tin alloy (solder), and the grade of copper product in the copper-tin mixture product is 62.32%, and the grade of tin is 23.79%;
[0021] Grind the copper-tin mixed product to -0.074mm and account for 72%. The flotation machine is stirred at 1500r / min for 4min and the pulp concentration is adjusted to 30%; The addition amount is 300g / t) and stir for 2min, then add foaming agent terpineol (compared to the additive of raw ore: 50g / t) and stir for 1.5min, and add pH regulator sodium hydroxide to adjust the pH of the pulp ...
Embodiment 2
[0026] The waste circuit board is pyrolyzed at 700°C, the material is selectively sheared and crushed, and then sieved. The tin in the material under the sieve accounts for about 90% of the original waste circuit board. After the non-metallic and magnetic substances are removed from the material under the sieve, copper is obtained. The tin mixed material, wherein the copper-tin mixed material mainly includes metallic copper and tin alloy (solder), is subjected to flotation, wherein the grade of copper product is 65.88%, and the grade of tin is 22.33%. Grind the copper-tin mixed product to -0.074mm and account for 85%. The flotation machine stirs at 1000r / min for 4min and adjusts the pulp concentration to 25%. Then add collector z-200 (compared to the raw ore The addition amount is 350g / t) and stirs for 3min, then adds foaming agent No. 2 oil (compared to the additive of raw ore is 50g / t), and adds pH adjuster sodium bicarbonate, adjusts the pH of ore pulp to be 6, carries out r...
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