Environmental safe disposal of cement kiln dust for the production of geopolymers
M. A. Abdelzaher, Essam A. Mohamed, Nabila Shehata, Hamdy Salah, Ramadan Abbas
Abstract
A large amount of industrial by-products are released from heavy industries such as power generation industry, steel industry, cement industry, etc. These wastes or by-products like fly ash, CKD, bottom ash, blast furnace slag, methakaoline, etc. pose various difficulties in getting rid of them. May the dynamic solution is to use these by-products for some other beneficial application. Clearly, the cement industry has been found to be an energy-intensive industry that acts as a major source of greenhouse gas emissions especially carbon dioxide, so, with the continuous growth of construction activities, the cement industry will last for a long time due to the need for high infrastructure. Recycling of heavy industry wastes will enhance their economical and environmental values. Production of geopolymers from the wastes of cement industry (CKD) defiantly save the raw materials, and reduce the CO2 emissions. In this work, local raw materials are used such as blast furnace slag, silica fume, CKD, meta-kaoline and alkaline activated solution of potassium hydroxide and potassium silicate has a molar ratio of K2O:SiO2 (0.7). The products obtained were tested for unconfined compressive strength setting time and workability, results show that it possible to produce good quality geopolymers (useful product) using industrial byproducts as precursors.