高速粉碎机作用下的电路板真空热解渣破碎特性

Crushing characteristics of vacuum pyrolysis residue of waste printed circuit boards under action of high-speed pulverizer

首先利用高速粉碎机对大颗粒废弃电路板真空热解渣进行破碎处理,然后采用筛分和颗粒计数法研究破碎产物的破碎规律与解离特性。结果表明,大颗粒废弃电路板真空热解渣在破碎过程中存在着显著的选择性破碎,金属铜主要分布在较粗粒级产物中,玻璃纤维和炭黑则主要分布在较细粒级产物中,并且铜能在较大粒级上实现充分解离;98.64%的铜分布在粒级为0.45~4.0 mm的破碎产物中,而92.05%的玻璃纤维和炭黑分布在粒级为-0.45 mm的破碎产物中;当粒级为-2.0 mm时,铜的解离度达到100%。

The large vacuum pyrolysis residue particles of waste printed circuit boards were firstly crushed by using high-speed pulverizer. Then the screening and particle counting method were employed to study the crushing laws and liberation characteristics of the crushed product. The results showed that there was significant selectivity crushing in the crushing process. The copper was mainly distributed in the coarse fraction and the glass fiber and carbon were mainly distributed in the fine fraction. And the copper can be sufficiently liberated on larger grain size. The mass distribution rate of copper is 98.64% for crushed products with grain size of 0.45 to 4.0 mm. The mass distribution rate of glass fiber and carbon is 92.05% for crushed products with grain size of -0.45 mm. The liberation degree of copper is 100% for crushed products with grain size of -2.0 mm.