Jamieson Evan, Kealley Catherine S, van Riessen Arie, Hart Robert D
School of Civil and Mechanical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
Technology Delivery Group, Alcoa World Alumina, P.O. Box 161, Kwinana, WA 6966, Australia.
Materials (Basel). 2016 May 19;9(5):392. doi: 10.3390/ma9050392.
The Bayer process utilises high concentrations of caustic and elevated temperature to liberate alumina from bauxite, for the production of aluminium and other chemicals. Within Australia, this process results in 40 million tonnes of mineral residues (Red mud) each year. Over the same period, the energy production sector will produce 14 million tonnes of coal combustion products (Fly ash). Both industrial residues require impoundment storage, yet combining some of these components can produce geopolymers, an alternative to cement. Geopolymers derived from Bayer liquor and fly ash have been made successfully with a compressive strength in excess of 40 MPa after oven curing. However, any product from these industries would require large volume applications with robust operational conditions to maximise utilisation. To facilitate potential unconfined large-scale production, Bayer derived fly ash geopolymers have been optimised to achieve ambient curing. Fly ash from two different power stations have been successfully trialled showing the versatility of the Bayer liquor-ash combination for making geopolymers.
拜耳法利用高浓度苛性碱和高温从铝土矿中提取氧化铝，用于生产铝和其他化学品。在澳大利亚，该过程每年会产生4000万吨矿物残渣（赤泥）。同期，能源生产部门将产生1400万吨煤燃烧产物（粉煤灰）。这两种工业残渣都需要进行贮存，但将其中一些成分结合起来可以生产地质聚合物，这是水泥的一种替代品。由拜耳液和粉煤灰制成的地质聚合物在烘箱养护后抗压强度超过40兆帕，已成功制备。然而，这些行业的任何产品都需要在苛刻的操作条件下进行大量应用，以实现最大程度的利用。为了便于潜在的无约束大规模生产，已对拜耳衍生的粉煤灰地质聚合物进行了优化，以实现常温养护。来自两个不同发电站的粉煤灰已成功进行了试验，显示出拜耳液与粉煤灰组合制备地质聚合物的多功能性。
