New Concept of Recycled FRP Products in Cement Burning Process by Using Non-Dust-Scattering Method

We developed a novel recycling system for discharged FRP (Fiber reinforced plastics) of disused FRP boats, and demonstrated that the product manufactured by the system is available for the burning process in cement plant. In this system,the recycled products are manufactured as follows: at first, FRP fine particles of the size of about 3 mm or less are made by crushing discharged FRP, the particles made are mixed with the used polyethylene sheets in agriculture, and are bound together with the polyethylene sheets melted by frictional heat of a twist mill. The dusts arising when FRP is crushed are prevented from scattering in the air by water shower. In cement plants, since there is a limit value of the concentration of chlorine due to the problem of dioxin, urethane foam containing a lot of chlorines that is used as a structural material in FRP boat is removed from FRP particles by making floated on water. Recycled products of non-dust-scattering type for the cement burning were experimentally manufactured by this recycling system and the cement burning test was done using the recycled products of size from about 3 to 8 mm. As a result, it was confirmed that the products were effective in the cement burning process.