| 摘要 |
<p>A buffering agent for a cementitious hazardous waste composition, containing electric arc furnace dust (EAFD) and water, includes dolomitic lime, namely either dolomitic quicklime, dolomitic monohydrated lime or dolomitic dihydrated lime. Dolomitic lime serves as a buffering agent for the hazardous waste composition by maintaining the pH of the waste composition within a target range over which solubility of several heavy metals tends to be minimized. These heavy metals include lead, zinc and cadmium, among others, and the pH range within which the heavy metals experience a minimum solubility is approximately 8.5 to 11.5, and preferably 9.4 to 10.2. In addition, dolomitic lime is substantially insoluble in water, so that the buffering agent will not leach or diffuse out of the waste composition.</p> |
