Fiber heat insulation waste recycling in laminated high-temperature composites with phosphate binder
Abstract
A recycling procedure is described for utilization of waste derived from spent fibrous refractory materials such as mullite-siliceous fibers, traditionally used for thermal insulation of high-temperature furnaces and other equipment. It is proposed to use the spent thermal insulation for manufacturing a composite material of the sandwich type, in which an intermediate layer consisting of the recycled fibers and a phosphate binder is located between two outer layers of an industrial roll material. In the case of using spent fibrous thermal insulation containing a binder the waste has been previously deagglomerated. The optimal composition of the intermediate layer containing a layered fibrous material of the mullite-siliceous fiber type (MKRP-130 or MKRKH-150) and an alumina-boron-phosphate/alumina-chromium-phosphate binder has been established, and the characteristics of the obtained composite materials have been determined.
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