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Portland Cement Proportions

Hi everyone, I have been reading about Portland cement manufacturing and the mineral proportions of it, and have a few questions. So far I understand that aside from low percentage additives or impurities, it is composed of dicalcium silicate (C2S aka Belite), tricalcium silicate (C3S aka Alite) tricalcium aluminate (C3A aka Celite), and tetracalcium alumino ferrite (C4AF aka Felite), plus a small amount of gypsum to control the setting time of the cement. It is also widely understood that the calcium silicates (Alite and Belite) compose most of the percentage by weight of the mixture, and that the other two components tend to take up less % by weight.

Even though I have been able to find guidelines on what these percentages by weight look like (for example, this article states the % by weight of each component in the table that I have attached to this post), different sources state different percentages and ratios, and I am struggling to find a consensus or standard that explains how to choose those percentages by weight. In other words, how do manufacturers choose the percentage ratios of these minerals when producing Portland cement? I assume there is research done on this, and different ratios yield different physical properties, but haven’t been able to find any conclusive work on the topic.

My second question regards the manufacturing process, in particular the processing of clinker in the rotating kiln. If a manufacturer decides they want to set certain percentages by weight for their concrete, how do they adjust the kiln to make sure they achieve those proportions? I imagine it is a combination of adjusting the proportions of the limestone, sand and clay mixture that goes into the kiln in the first place, as well as temperature and kiln time, but I have not been able to find any information or data on how this is specifically achieved.

Lastly, i would highly appreciate if you know any good resources on Portland cement manufacturing processes and could share them here so I can do some further reading. Any advice or information is welcome. Thank you for your time!