Thermal behaviour of a coarse raw mix and the micro-homogeneity of the resultant clinker

Clinker produced from a coarse raw mix displays a more homogeneous distribution of intermediate phase and a less uniform C3 A/C6AxFy ratio than clinker made from a conventional fine-grain mix. The more pronouncedly variable C3 A/C6AxFy ratio indicates the formation of two SiO2- and Al2O3-Fe2O3-rich melts, out of which the subject intermediate phases precipitate on completion of alite formation. Subjected to rapid heating (50 K/min) the coarse raw mix is seen to have a significantly lower calcite calcination temperature than that of the conventional fine mix.

1 Clinker micro-homogeneity

1.1 Introduction

A lack of micro-homogeneity and inadequate ­sinterability on the part of a given raw mix is generally attributable to an insufficient degree of fineness [1]. Clinker produced from such a mix therefore may also display deficient micro-homogeneity.

Despite the fact that the precipitation time of the raw mix in a cyclone heat exchanger accelerates with the square of the particle diameter, no appreciable segregation of the raw mix results, because the material is subsequently remixed in the ascending and descending downstream pipes and, in particular in...

Find out more in the current Issue. Order now!

Related articles:

1-2/2016 WO 2015/179892 A1

Apparatus for producing cement clinker

(22) 27.05.2015 (43) 03.12.2015 (57) Apparatus for producing cement clinker, comprising a kiln (3) for calcining raw materials to form cement clinker, comprising a preheating stage (2) for preheating...

4/2016 US 2016/0052822 A1

Process and device for ­cement clinker production

(22) 08.04.2014 (43) 25.02.2016 (57) In a process for the production of cement clinker, in which raw meal is preheated in a preheater (3) using the hot exhaust gases from a clinker kiln, and the...

7-8/2015 EP 2 868 635 A1

Cement clinker cooler and method for cooling cement clinker

(22) 29.10.2013 (43) 06.05.2015 (57) White cement clinker can be ­efficiently produced using a kiln 10 for sintering cement clinker and ­unloading the cement clinker from the kiln 10 to a clinker...

9/2018 EP3331834 (A1)

Use of clinker kiln dust for gas scrubbing

(22) 05.08.2016 (43) 13.06.2018 (57) Summary of the corresponding patent WO2017024247 (A1): Methods and apparatus for reducing the content of controlled acidic pollutants in clinker kiln emissions are...

1-2/2018 US2017354914 (A1)

Use of clinker kiln dust for gas scrubbing

(22) 28.08.2017 (43) 14.12.2017 (57) Methods and apparatus for reducing the content of controlled acidic pollutants in clinker kiln emissions are disclosed. The methods and apparatus include...