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I have recently read a paper regarding the study of neural networks in the LD converter. In this paper, there is a table with the average, min and max valuables of all variables used and the min value of scrap used was 0. But the process require the use of scrap to absorb the heat from the...

Why does the sand turn black? Is it oxidation from high temperature?

So basically my small size mounding sand is turning black after pouring the cast iron. It then gets grey and star decomposing in the ground. The wall thickness of the mounding is thin too. I thought about putting some iron oxide in the mixture so it will increase its heat capacity but I still...