We are producing sulphate resistant cement clinker. We believe from the analysis of the clinker that we could also produce oilwell cement as per API standard. Do you have any comments (analysis attached).
Secondly, our ALM has been reduced from 1.25 to 0.70 while keeping LSF as 0.90 and SIM 2.25 we are facing following problems:
1.Ring in inlet causing inlet spillage
2.Thick coating at 27-28m hampering production How can we overcome these problems?

Some classes of oil well cement have low C₃A content and are coarsely ground. The key to producing oil well cements is the testing that is required to achieve the certification. You need to investigate the costs of installing the equipment to conduct this testing on a regular basis and then apply for certification to produce oil well cements. The ring and coating problems are caused by the high Fe₂O₃ content of the SR raw mix. I suggest you increase the silica modulus of the raw mix.

Are there any recognised ways to increase raw mill production?

The first stage is to maximise the output with the existing mill. You should conduct axial tests and recirculating load tests to make sure that the ball charge and lining are optimal. The next stage might be to conduct trials with grinding aids to try to boost the output of the mill by up to 15 per cent. Beyond that you will need to consider modifications to the milling circuit by adding further equipment. There are two options to do that: (i) add a pregrinding facility such as a hammer mill or roll press, or (ii) add a regrind mill. Adding further equipment will be significantly more expensive than introducing grinding aids but has the potential to boost the output to higher levels.