1156 posts
Burning Question 47
What do you know about consuming SPL in cement kilns in North America. What are the environmental concerns with this. There are kilns burning SPL on North America. I believe that one of the plants at Harleyville was doing this. If there are any environmental concerns it is that the pot liners absorb some heavy metals in the electrolysis process and that this might lead to emissions of these materials. The SPL will also contain high levels of NaF and this will significantly affect clinker chemistry and kiln operations but not necessarily emissions. The sodium and fluoride should all be retained in the clinker.
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1156 posts
Re: Burning
There are kilns burning SPL on North America. I believe that one of the plants at Harleyville was doing this. If there are any environmental concerns it is that the pot liners absorb some heavy metals in the electrolysis process and that this might lead to emissions of these materials. The SPL will also contain high levels of NaF and this will significantly affect clinker chemistry and kiln operations but not necessarily emissions. The sodium and fluoride should all be retained in the clinker.
1156 posts
Burning Question 48
I would like to ask about variable chloride values in clinker which can vary from 0.003 to 0.05. Also what will happen if the burner is operated in a reducing atmosphere and how to ensure that the main burner is always operating in an oxidising condition.
1156 posts
Re: Burning
The first thing you must do is tie down the source of the variable chloride input to your kiln. This must be in one of the raw materials or the fuel. If one of the raw materials perhaps you can solve the problem by selective quarrying. Operating the burner in a reducing manner will not affect the chloride recirculation but will greatly enhance the sulphate recirculation. If you have any incidence of CO at the kiln inlet then you are operating ina reducing manner and are likely to have sulphate based problems. The way to avoid this is to adjust the flow of fuel and primary air to the burner.