Patent ID: 8021478
Filing Date: 2011-09-20
Classification: C04B

Abstract:
1. A method for producing Portland cement clinker at low temperatures below 1380° C., said method including the stages of: a) preparing a raw meal based on a Lime Saturation Factor (LSF), a Silica Module (SM) and an Alumina Module (AM) and an adjustment of a fineness of a raw mixture, with the LSF being less than 1, the SM between 2 and 3 and the AM between 0 and 3, and the adjustment of fineness being approximately 80% of the fineness in a mesh n.200 (approximately 75 microns); b) feeding the raw meal; c) preheating the raw meal; d) calcinating the preheated raw meal; e) sintering the calcinated raw meal in order to produce a Portland cement clinker; and f) cooling the cement clinker; the method being characterized by the following: the control modules in stage a) for preparation of the raw meal are based on sulfur content of a solid fuel that will be burned and fixed in the calcinated raw meal; the raw meal does not include sulfated compounds, but instead it contains an agent that is added in order to encourage formation of clinker phases in the raw meal before step b) feeding; and the operating parameters of the kiln are controlled as follows: in order to allow, if not total, at least increased fixing of the sulfur generated by burning solid fuel in the calcinated raw meal such as in order to create new additional phases.