Abstract
Steelmaking slag is one of major by-products from steelmaking process and its efficient recycling is essential to establish the environmentally-friendly steelmaking industry. Recently steelmaking slag has been recognized as an effective supplier of nutrient elements to recover the ocean environment from sea desertification. It is believed that the efficient dissolution of iron ion is critical to rehabilitate the damaged sea coast, while the solubility of iron ion in seawater is much below the required concentration. Therefore, the simultaneous addition of humic acids to steelmaking slag is necessary to produce the stable chelated iron ion in seawater. In the present paper, the effect of natural substances containing humic acids or a chemical organic acid on the dissolution behavior of nutrient elements from steelmaking slag was studied and the dissolution mechanisms of steelmaking slag into seawater were discussed.
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