Because gas treatment production line is characterized by long flow,wide distribution decentralizing control procedure and a lot of monitoring points etc,fieldbus was adopted for collection of real-time signal,communication and control to realize automatic coordinating management and control of gas treatment production line and successful control of lead and zinc smelting gas meanwhile ensure normal and high effective production of lead and zinc.
The result is showed as follows: the content of Cu,Cr,Hg in the mireral slag is low,with their pollution indices lower than 1,while that of Zn,Pb,Ni,Cd,As is much higher,which single pollution index is 2.95,45.14,1.00,10.67,50.41 respectively,and the comperhensive pollution index is as high as 36.98,attributed to the string pollution resource.
Silver was preconcentrated on the resin in 1 mol/L HCl, and separated from common metal elements; then eluted by 0.25 mol/L NH 4Cl-0.5 mol/L thiourea, and determinated by FAAS. The recovery of silver was 99.4%～104.3%.
Four soils contaminated by Pb-Zn mining, Pb-Zn smelting, sewage sludge application, and clay pigeon shooting, respectively, were evaluated for their ability to attenuate relatively high concentrations of supplied Cd and Pb.
Experimental studies on phase equilibria in the multicomponent system PbO-ZnO-CaO-SiO2-FeO-Fe2O3 in air have been conducted to characterize the phase relations of a complex slag system used in lead and zinc smelting.