Waste solid resource utilization of steel slag as adsorbent for heavy metals

摘要

Batch experiments were carried out to investigate heavy metal ions adsorption properties of steel slag, the results showed that steel slag could be used as an effective adsorbent to removal heavy metals such as Cr 3+ ,Cu 2+ ,Pb 2+ and Zn 2+ from the aqueous solution. For the heavy metal Cr 3+ , the removal yield increased with increasing contact time and reached the equilibrium state within 1h; The removal of Cr 3+ increased from 44% to 99% at the rang of steel slag particle size from 2.5 mesh to 80 mesh, but go on decreasing the steel slag size, the removal of Cr 3+ did not almost change; The adsorption of Pb 2+ was not affected by pH value from 1.3 to 7.5, the removal percentages were all above 99%; at the same experimental conditions, the adsorption capacity of steel slag for mixed system decreased in the order of Zn 2 + ＞Cr 3+＞Cu 2+＞Pb 2+ , and comparing to the single metal ion system, the adsorption capacities all decreased, respectively. The equilibrium data fitted to the Langmuir and Freundlich model, However, the correlation coefficients determined for linear Freundlich models were higher than those of others.