Which risk increases when early blast furnace operators add excessive charcoal during iron production?

💡 Explanation

When excessive charcoal is added, the carburization process increases because the high carbon activity dissolves more carbon into the molten iron, leading to increased carbon content in the final pig iron. Therefore, elevated carbon content is the primary risk, rather than increased slag, reduced refractory lifespan, or higher oxide levels which arise from different operational issues.

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