| 英文摘要 |
The first year of this project was focusing on the investigating the advanced
recycling technology of mercury-containing lamps and electric arc furnace dusts EAFD,
which contain great deal of quantity and lack technologies and additional values.
Subsequently, equipments for recycling experiments were established. The second year
will be concentrating on set up the standard of reusing product based on the
experimental results, in order to assist the environmental industries to upgrade their
technology and reduce the foreign support. Also the purposes are to reduce the ratio of
temporary storage in the factory and foreign country export treatment of the wastes,
rising recycling level and reusing products competitiveness, and increase waste reusing
percentages.
The first year of the project has investigated five mercury-containing lamps
manufacturers, seven mercury-containing lamps consumers, and twelve EAFD
producers which contain general carbon steel, stainless steel, and alloy steel. The reports
of these investigations were in the yearly report.
The research was focusing on the understanding MRT system that is the leading waste
mercury-containing lamps treatment technology in the world and planning the waste
mercury-containing lamps recycling equipments. The design of equipment contains two
parts, the first part includes the collecting and refining CCFL fluorescent powder, lamp
fluorescent powder, lamp exhaust pipe, SHP, and UV mercury-containing lamps. The
other part is the mercury purification experiment. According to the experiments results,
the evaluation of the most suitable waste mercury-containing lamps recycling
technology was accomplished. The EAFD recovery technique, which is most suitable
for the industries and environmental conditions in Taiwan, were investigated. This
research also analyzed the advantages and disadvantages of each commercialized EAFD
treatment process. In conclusion, the pyro-metallurgical processes have the higher
efficiency, the smaller needed plant area, the higher recovery efficiency of Zn, Pb and
Cd which satisfy the demands of environmental regulations and codes, and the
capability of recovering iron content. Furthermore, they have the advantages of fewer
unit operations, non-sensitive to variation of EAFD composition and easy to handle. We
prefer to recommend the pyro-metallurgical methods though they are expensive in the
equipment investment. Among the pyro-metallurgical processes, the Rotary Hearth
Furnace (RHF) using carbon-thermal reduction is best choice. The produced Direct
Reduction Iron (DRI) can be recovered as the raw material for EAF or BF. Furthermore,
the recovered ZnO has the higher purity and value. The ongoing study will focus on the
purification of crude ZnO produced by Waels process and the synthesis of nano ZnO
powder using the hydro-metallurgical processes combined with the other methods such
as hydrothermal and precipitation processes.
|