On the way to safer Printed circuit boards disposal, Printed circuit boards are an important component of modern electronics. However, once they serve their purpose, they are often burned or buried in landfills, polluting the air, soil and water.
Most worrying is the brominated flame retardant added to the printed circuit board so it does not burn.
PCB consists of 30% metal and 70% non-metal particles and supports and connects all electrical components of the machine. Metal components can be recovered by high-voltage magnetic and electrostatic separation from damaged circuit boards, leaving non-metallic particles including resins, reinforcing agents, brominated flame retardants, and other additives. now the new way to safer Printed circuit boards disposal.
Scientists associate brominated flame retardants with endocrine disruption and damage to fetal tissue. Therefore Jujun Ruan and his colleagues want to develop a process to eliminate combustion inhibitors from PCB waste so that they do not pollute the environment.
The researchers lubricated the circuit board and released metal components by the separation of magnetic and electrostatic high voltage, as is usually the case. They then place non-metallic particles in the ball mill on a rotating machine that uses a small agate ball to grind the material.
They also added iron powder, which previous research had shown was useful for removing halogens such as bromine from organic compounds.
After grinding by grinding, the particle surface bromine content is reduced by 50% and phenolic resin compounds decompose.
Researchers have found that iron transfers electrons to refractory combustion compounds during the ball winding process, which leads to the expansion and destruction of carbon-bromine bonds.