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What is the appropriate content of nitrogen in carbon raiser?
Views: 144 Update date: Jun 15,2021

Carbon raiser is a ferroalloy product to compensate for the loss of carbon in smelting. It is also widely used in the foundry industry. It can be divided into high-nitrogen, medium-nitrogen, and low-nitrogen  carbon raiser. What is the appropriate nitrogen content of carbon raiser?

 

Many carbon raiser suppliers have not calibrated the nitrogen content in detail. Recently inquired with a well-known domestic carbon raiser supplier, the results are as follows:

 

1. Naturally calcined petroleum coke carbon raiser, because it has not been calcined at a high temperature, the calcining temperature may be low and the time may be short. The nitrogen content is generally around 1000 ppm, and the sulfur content is also high. No clear marks can be drawn on white paper.

 

2. High-temperature calcined petroleum coke carbon raiser, the nitrogen content is 300~500PPm, and the sulfur is much lower than the former. Clear marks can be left on white paper.

 

3. Coal carbon raiser, the nitrogen content is different depending on the quality of the coal, and the nitrogen content is different, generally between 2000 and 7000 ppm, that is, 0.2% to 0.7%.

 

4. Special is the graphite column particle carbon raiser, which is a carbon raiser made of graphite powder plus a binder and extruded into cylindrical particles. This kind of carbon raiser, because the carbon is in the form of graphite, is particularly well absorbed in the furnace, which is almost the same as the high-temperature calcined petroleum coke, and the price is about 5,000 yuan. Smelting workers think this carbon raiser is very good, low in sulfur and low in nitrogen. But the nitrogen content of this carbon raiser is very high! Generally around 2000PPm, you should pay attention!

 

5. The most effective is the high-temperature calcined petroleum coke carbon raiser, with a nitrogen content of 100PPm. Sulfur is lower than the former. Clear marks can be left on white paper, and it feels comfortable, just like a 6B pencil.




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