Abstract
Raw material composition plays an essential role on the lining life of cement rotary kiln.They are obtained from hard rock quarries that represent the first step in the cement manufacturing process. That raw materials are transported to Al- Kufa cement plant then crushed and ground to very fine powder and then blended in the correct proportions.This research aims to study suitable rations of raw materials to produce cement in al Kufa cement plant in Iraq. Through a software program, suitale raw materials ratios for the clinker were estimated, then chemical and physical tests for clinker and cement according to Iraqi Standard Specification were done to recognize the effects on the properties of cement such as the ratios of major and minor oxides, Lime saturations factor (LSF), Silica Modulus (SM) Alumina Modulus (AM), compressive strength, setting time and soundness. Keywords: Portland Cement, Raw material, Cement industry, Rotary kiln and Factors Affective of clinker DOI : 10.7176/CER/11-1-06
Highlights
IntroductionPortland cement is a gray non- metallic, inorganic powder, the result of a mixture of calcium silicate (mainly limestone) and aluminoferrites
Portland cement is a gray non- metallic, inorganic powder, the result of a mixture of calcium silicate and aluminoferrites
When cement is mixed with water it forms a paste that sets and hardens due to the formation of calcium silicate hydrates and or calcium aluminates hydrates as a result of the exothermic reaction
Summary
Portland cement is a gray non- metallic, inorganic powder, the result of a mixture of calcium silicate (mainly limestone) and aluminoferrites. The clinkering process is conducted in the rotary kiln by reacting calcium oxide at a high temperature (1400-1500°C) with silica, alumina and ferrous oxide to form the silicates, aluminates and ferrites of calcium which are tha main component of clinker. The final reactions take place in this phase That it causes formation of coating over the refractory lining in the remaining part of the kiln. In this higher temperature section, called burning zone, the refractory of the kiln is under severe damage because of high temperature. The thickness of the coating in the buring zone is momentous because of the protection of the refractory lining from damaging which increases the life of the refractory and movement of feed through the kiln
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