Patent ID: 8899422
Filing Date: 2014-12-02
Classification: B07C,B29B,B29K,Y02W

Abstract:
1. A method for separating a mixture of solid materials, the method comprising: screening a mixture of solid materials into at least a first fraction and a second fraction based on particle size, where the mixture of solid materials is a plastic-rich mixture recovered from waste electrical and electronic equipment, the first fraction comprising particles having particle sizes of below about 25 mm, the second fraction comprising particles having particle sizes greater than the first fraction; sorting the first fraction based on differences in X-Ray transmission of different materials to form a third fraction and an ejected fraction, the ejected fraction comprising a majority of plastics that contain brominated flame retardants from the mixture; and density sorting at an elevated density the third fraction into a high-density fraction and a low-density product fraction, the low-density product fraction comprising 90 percent or greater (by weight) of ABS, HIPS and PP.