Reduction behavior of zinc ferrite in EAF-dust recycling with CO gas as a reducing agent.

EAF-dust containing metal oxides can be regarded as an important source for zinc and iron. In this study, the reduction behavior of zinc ferrite with CO gas as a reducing agent under different temperatures was investigated to develop a new process for the recovery of zinc and iron from EAF-dust. The results of the phase studies with synthetic franklinite show that zinc substituted wustite, and spinel with low zinc content formed at lower temperatures from 450 to 850 °C due to incomplete zinc-iron-separation.

Removal of chloride from MSWI fly ash.

The high levels of alkali chloride and soluble metal salts present in MSWI fly ash is worth noting for their impact on the environment. In addition, the recycling or reuse of fly ash has become an issue because of limited landfill space. The chloride content in fly ash limits its application as basis for construction materials.

Removal of chloride from electric arc furnace dust.

Electric arc furnace (EAF) dust with high chloride content increases the threat of dioxin emissions and the high chloride content reduces the value of recycled zinc oxide produced by EAF dust recycling plants. This study conducts a number of laboratory experiments to determine the technical feasibility of a new dechlorination method. These methods consist of a series of roasting processes and water washing processes.

The characteristics of organic sludge/sawdust derived fuel.

A fundamental study of the characteristics of a sludge refuse-derived fuel (RDF) and the combustion behaviors were done. The test data demonstrate good results for the development of energy recovery technology of organic sludge or waste. The ash deposit formation propensity has been based on pretreatment, temperature and the ratio of organic sludge to sawdust.

Pore size and adsorptive capacity of unburned carbon affected by gasification with carbon dioxide.

Gasification of unburned carbon by using CO2 gas at temperatures of 950-1100 degrees C was performed, in order to modify the pore size distribution and adsorptive capacity of the carbon. Equipments such as N2 adsorption apparatus, mercury pore size analyzer, and SEM were used, where yield, specific surface area and methylene blue number for adsorptive capacity, pore size, and appearance of the carbon were analyzed. Results show that gasification of unburned carbon produces larger adsorptive capability as well as a larger specific surface area.