Control of the particle size distribution of a cement grinding circuit
Julin, Joonatan (2021)
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2021102552177
https://urn.fi/URN:NBN:fi-fe2021102552177
Tiivistelmä
For the past decades, the Blaine value has been the predominant characteristic when controlling the process parameters of a cement grinding circuit. The Blaine method measures the permeability of the cement, and therefore, describes the fineness of the cement. This thesis investigated how the particle size distribution (PSD) could be implemented as input data to the process control in a closed grinding circuit. This thesis consists of sets of experiments exploring the effects of process parameters on the PSD of the product.
A series of experiments were conducted to study how process parameter changes affected the particle size distribution of the product. The results from the first and the second sets of experiments showed that the PSD of the cement changed only by small margins when the Blaine value was kept constant. Several linear regression models were developed to understand the effect size of process parameter changes on PSD characteristics of the product.
The third set of experiments was conducted to study the effects of the separator speed and separator airflow on the product's PSD without maintaining a constant Blaine value. Changes to separator speeds and separator airflow significantly affected the PSD of the product. The process parameter changes did not have a linear effect on PSD characteristics. Thus, future research should explore the non-linear behavior of process parameters on the PSD of the product.
A series of experiments were conducted to study how process parameter changes affected the particle size distribution of the product. The results from the first and the second sets of experiments showed that the PSD of the cement changed only by small margins when the Blaine value was kept constant. Several linear regression models were developed to understand the effect size of process parameter changes on PSD characteristics of the product.
The third set of experiments was conducted to study the effects of the separator speed and separator airflow on the product's PSD without maintaining a constant Blaine value. Changes to separator speeds and separator airflow significantly affected the PSD of the product. The process parameter changes did not have a linear effect on PSD characteristics. Thus, future research should explore the non-linear behavior of process parameters on the PSD of the product.