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《宝钢技术研究(英文版)》 2008-02
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The extraction of slag in seawater and its influence on the growth of phytoplankton

Dong Xiaodan Economics & Management Research Institute,Baosteel Group Corporation,Shanghai 200122,China  
Initial research was carried out on the extraction and absorption of metal ions in seawater slag and their influence on oceanic phytoplankton.It was discovered that the pH in a steel slag solution that had a certain concentration (1.67 g/L)increased as the time for oscillation(four days)was extended.The four elements of Zn,Mn,A1 and Cu all displayed the basic signs of extraction,while Fe,Cr,As,Pd,Hg,Se and Cd all displayed the basic signs of absorption. Although there were some changes in the content of Ca and Mg,the changes were not very evident during the time of the experiment.When the time for oscillation was further extended(up to 16 d),the change in the solution's level of pH was small,but the concentration of metal ions largely decreased.In natural coastal seawater,the steel slag showed no ability to promote the growth of Heterosigma akashiwo(H akashiwo);while in nutritious coastal seawater,steel slag with a concentration of less than 392 mg/L could stimulate the growth of H akashiwo.However,the growth of H akashiwo was inhibited when the concentration was more than 488 mg/L.In nutritious coastal seawater without microelements,steel slag with a concentration of less than 124 mg/L obviously stimulated the growth of H akashiwo.In ocean water,the growth of H akashiwo was accelerated when the concentration of steel slag was less than 250 mg/L and the concentration was increased.However,growth simulation was decreased with further increases to the concentration of steel slag.Therefore,it can be said that slag has an optimal concentration for the growth of H akashiwo.
【CateGory Index】: X55
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