1156 posts
Kiln feed Question 5
I am a Chemical Engineer working in a company in the cement area in South America and the question is: What sort of fluorspar (acid, metallurgic) is used as fluxing agent in clinker process, what percentage of fluorspar and what quantity in the raw mix fed to the kiln. Does it imply savings in heat?
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1156 posts
Re: Kiln feed
In my experience acid grade fluorspar spar is used as a mineraliser, however there is no reason why other grades should not be used. Again in my experience addition rates have been up to 0.4 per cent to kiln feed, achieving unit fuel consumption savings in excess of 200 kJ/kg clinker.
1156 posts
Kiln feed Question 6
Can I have the details about "patented TXI Cemstar addition of air cooled slag to cement kilns". Do you have any information of any cement plant using Blast furnace slag as raw material for rawmix. What are the basic requirements and the precaution we must take to use GBFS as a rawmix component. Will it affect productivity of the mill as I heard that slag is very difficult to grind.
1156 posts
Re: Kiln feed
The TXI Cemstar process involves the addition of air cooled slag to the inlet of the rotary kiln with the aim of boosting the output by up to 20 per cent. The distinction between "air cooled slag" and "granulated blast furnace slag" is important. I know of no factories using granulated slag as a raw mix addition while a number in the USA are using air cooled slag and the Cemstar process. This air cooled slag is not added to the raw mill, but added directly to the kiln inlet via a hopper and appropriate feeding device. This is the basis of the TXI patent from the Cemstar process.