To download the below  and all other Useful Books and calculations Excel sheets please click here 

To download the below  and all other Useful Books and calculations Excel sheets please click here 

Cement mill audits

Long & short term data analysis

• Production
• Operation
• Quality
• Evaluation & Potential estimation based on:-Comparison with other grinding systems-Theoretical calculations

Short Term Data Analysis

• Operation
• Quality

Targets of a “B” Level Audit

Get to know well each of the circuit components

Measuring is the base

Requirements for the “B” level audit

• Quality parameters to be known:

-Composition

-Fineness:

-Blaine

-[%] residue on a screen-

-A given PSD

-Early strength

-Late strength

-Cement target temperature

-LOI

• Cement type choice (depends on targets)

–The one with the highest throughput

-The most produced

-The finest one

– A chosen composition

– Stable operation for 6 – 8 hours

– Previous checking of:

-Feeders

-Instruments

-Etc.

Logical realisation order

• Define the cement type (s) for the audit
• Gather the main machines design data
• Central Control Room visit
• Circuit visual inspection
• Field activities:

-Counters reading

-Sampling

-Measuring

-Mill, separator and auxiliaries internal visual inspection

• Data compilation and analysis
• Conclusions & report

Main machines design data

Mill Control System, Strategy & Trends

• Information on:

-Available information at the CCR

-First contact with circuit layout

-Control system

-Control strategy

-First impression on operation

-Circuit stability

Circuit / Visual inspection during operation

Power measurement

Material and liquids sampling and measurements

Material sample analysis

Mill air measurements

Separator air measurements

Mill Material Sampling

Mill material samples analysis

Mill Visual Inspection

Mill / Balls sampling

Separator / Visual inspection / 1st Generation

Separator / Visual inspection / 3rd Generation

Fans / Visual inspection

Cement mill Performance test data sheet

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