What is the primary chemical state of molten blast furnace slag_________________?
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Answer: C. Calcium silicate
Explanation
Molten blast furnace slag is formed by combining limestone flux with silica-based ore impurities. The chemical reaction produces complex calcium silicates that float on top of molten iron. Calcium silicates have a lower density than liquid iron, allowing easy separation during smelting. Blast furnace slag is a primary byproduct generated during the commercial production of pig iron. Limestone is added to the furnace specifically to react with unwanted silica gangue materials. Molten slag is tapped from the furnace separately from the liquid metal to ensure purity.
Granulated blast furnace slag is widely processed and used as a supplementary cementitious material. Civil engineers utilize blast furnace slag as a durable aggregate material in road construction. Managing slag composition is crucial for controlling the chemical purity of the final iron product. Option A is incorrect because raw sand is an input component rather than the final reaction product. Option B mentions magnesium silicate, which is not the primary constituent of standard ironmaking slag. Option D refers to iron pyrite, a mineral commonly known as fool is gold found in ores.
- Subject
- Engineering
- Category
- Chemical Engineering
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- —
- Difficulty
- medium
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