| 摘要 |
<p>A high iron content cement is formed principally from two industrial by-products which are available in very large quantities, (1) cement kiln dust, or CKD, and (2) the Red Mud which is a by-product of the extraction of alumina from bauxite ore. Smaller quantities of lime (calcium oxide) and gypsum (calcium sulfate) and aluminum oxide as needed, are added to the CKD and Red Mud, and the mixture is heated to between about 1250 degrees C. and 1400 degrees C., substantially lower than the kiln temperature for Portland cement. The resultant clinker is pulverized to form a lightweight, fast setting, strong, hydraulic cement.</p> |
