User experiences of VRM grinding and optimisation at Indocement: Jean-Marc Reginster, HeidelbergCement Technical Centre (Indonesia)

Filmed at Cemtech Asia 2015, 21-24 June, Grand Hyatt, Bangkok, Thailand

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I will talk today about our experience in Heidelberg Cement, I will not go into too much detail because we don't have a lot of time for that, but I will explain to you what is our feeling about vertical mills, and what we think about it. So we'll talk about three vertical mills. There's one Gebr. Pfeiffer mill with six rollers, there is one Loesche mill with three plus three rollers, and there is OK mill that we operate in Citeureup Indonesia.

So we will go quickly through the characteristics of the mills, there is also a sheet with the separate characteristics, the types of products, what we produce in Port Kembla and Jency, and then the separate experience with the various mills. So basically, these are the characteristics of the mills, Port Kembla it's 6 meter diameter table, Jency is 5.3 meter diameter mill, in the Indocement is OK mill, 5.6 diameter mill and then we're going to start three new mills from Russia, 5.6 table diameter , these means are not yet in operation. We're erecting them and we should be in operation by the end of this year.

So these are the main characteristics, airflow and type of separator, these are all high efficiency separator, and then these mills are producing OPC or slag, and for example in Port Kembla there is mixing of the products after the mill, in the Loesche mill and Jency we are producing OPC but feed fly ash in the top of the mill that is mixed directly in the production unit. In Citeureup we're feeding material clinker, gypsum, limestone and truss together on the table, and it's grind directly in the mill and goes to the finished product. Indocements P14 will be the same, the same working the same way, also producing OPC. So these are the types of components we're using, so Port Kembla we're using clinker, gypsum and limestone, and then we're grinding slake and gypsum separately, and these two products are mixed.

Jancy, it's basically clinker, gypsum that is ground and fly ash fed in the other separator . In Indocement, we use mainly PCC which is 72% clinker, 3% gypsum, limestone and truss. We go up to 20% truss. So in all the installation we have achieved the guarantee figure given by the OEM, the milln supplier we are able to maintain this quality and the throughput. So this is the Pfeiffer mill at the Port Kembla. This is a multiple drive mill which is quite a new technology.

This technology is really very interesting because you have a much more simple transmission system. One of the main advantage, here you see the balll that is under the table, in the classical system, you have

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