DISTRIBUTION CHARACTESRITICS OF HEAVY METALS DURING THE PROCESS OF ELECTROPLATING SLUDGE INCINERATION

摘要

Thermal characteristic and the distribution of different heavy metal elements (Pb, Cd, Cu, Zn, Ni and Mn) was studied in the process of electroplating sludge incineration. The results of experiment show that, seen from thermal analysis, there are some peaks of weight loss as 100□, 150□ and 600□ in the process of experiment of thermal gravity. Among these peaks, the peaks of 100□ and 150□ is caused by that the volatile separated out and organic matter combusted and pyrolysed, and the peak of 600□ is produced by the carbonate decompose at the same time. From EDS analysis, electroplating sludge is composed by these main elements which are O, S, Al, Ca, Cr and Fe, and other secondary elements such as Mg, Cu, Zn, P, Cl and C. In the process of temperature promoted, the quantity of nonmetal such as C and Cl decrease, and the quantity of Cr, Fe, and Mg is steady within 900□. From the experiment of distribution rule, the quantity of Mn, Pb, Ni and Cu decrease in the process of incineration while the furnace temperature raise, among these heavy metal the quantity of Ni decrease most obviously, and on the contrary the quantity of Cd enrich obviously in this process.