Yliniemi Juho, Kinnunen Paivo, Karinkanta Pasi, Illikainen Mirja
Fiber and Particle Engineering Research Unit, University of Oulu, Oulu 90014, Finland.
Materials (Basel). 2016 Apr 26;9(5):312. doi: 10.3390/ma9050312.
Mineral wools are the most common insulation materials in buildings worldwide. However, mineral wool waste is often considered unrecyclable because of its fibrous nature and low density. In this paper, rock wool (RW) and glass wool (GW) were studied as alkali-activated material precursors without any additional co-binders. Both mineral wools were pulverized by a vibratory disc mill in order to remove the fibrous nature of the material. The pulverized mineral wools were then alkali-activated with a sodium aluminate solution. Compressive strengths of up to 30.0 MPa and 48.7 MPa were measured for RW and GW, respectively, with high flexural strengths measured for both (20.1 MPa for RW and 13.2 MPa for GW). The resulting alkali-activated matrix was a composite-type in which partly-dissolved fibers were dispersed. In addition to the amorphous material, sodium aluminate silicate hydroxide hydrate and magnesium aluminum hydroxide carbonate phases were identified in the alkali-activated RW samples. The only crystalline phase in the GW samples was sodium aluminum silicate. The results of this study show that mineral wool is a very promising raw material for alkali activation.
矿棉是全球建筑中最常见的保温材料。然而，由于其纤维性质和低密度，矿棉废料通常被认为不可回收。在本文中，岩棉（RW）和玻璃棉（GW）被作为碱激活材料前体进行研究，无需任何额外的共混粘结剂。两种矿棉均通过振动盘磨机粉碎，以去除材料的纤维性质。然后用铝酸钠溶液对粉碎后的矿棉进行碱激活。RW和GW的抗压强度分别高达30.0MPa和48.7MPa，两者的抗弯强度均较高（RW为20.1MPa，GW为13.2MPa）。所得的碱激活基体为复合型，其中部分溶解的纤维分散其中。除无定形材料外，在碱激活的RW样品中还鉴定出铝酸钠硅酸盐水合物和碱式碳酸镁铝相。GW样品中唯一的晶相是硅铝酸钠。本研究结果表明，矿棉是一种非常有前景的碱激活原材料。
