For the efficient supply of nutrition for phytoplankton multiplication in marine environment, the dissolution behaviors and the dissolution mechanisms of Ca, Si, P and Fe elements from steelmaking slag into seawater were investigated. The shaking experiment with synthesized CaO–SiO_(2)–P_(2)O_(5)–FeO slag was conducted at room temperature. The variations of shaking time, the CaO/SiO_(2) ratio of slag and the slag/seawater ratio were taken into consideration. The dissolution behavior of elements especially Si and P, pH of solution and the effect of slag/seawater ratio on dissolution are classified into two types by the CaO/SiO_(2) ratio of slag. The dissolved concentration of Ca of slag with large CaO/SiO_(2) ratio is much larger than that with small ratio. Mg~(2+) ion originally contained in seawater provides an obvious buffering action on pH increasing process which is caused by the dissolution of Ca. Moreover, the solubility diagrams are applied to elucidate the dissolution mechanisms. Additionally the dissolution of Fe is also analyzed with potential - pH diagram.
展开▼
机译：为了有效地为海洋环境中的浮游植物繁殖提供营养，研究了炼钢渣向海水中钙，硅，磷和铁元素的溶解行为及其溶解机理。在室温下对合成的CaO–SiO_（2）–P_（2）O_（5）–FeO炉渣进行了振动实验。考虑了振荡时间，炉渣CaO / SiO_（2）比和炉渣/海水比的变化。炉渣的CaO / SiO_（2）比将元素特别是Si和P的溶解行为，溶液的pH值以及炉渣/海水比对溶解的影响分为两种类型。 CaO / SiO_（2）比大的炉渣中Ca的溶解浓度比小比例的大。最初包含在海水中的Mg〜（2+）离子对Ca溶解引起的pH升高过程具有明显的缓冲作用。此外，溶解度图用于阐明溶解机理。另外，还用电势-pH图分析了铁的溶解。
展开▼
