|Title||Recovery of titanium (IV) by hydrometallurgical treatments from fly ashes generated from municipal incineration plants|
|Publication Type||Presentazione a Congresso|
|Year of Publication||2005|
|Authors||Fontana, Danilo, Giacco S., Pietrelli L., and Porzio V.|
|Conference Name||REWAS'04 - Global Symposium on Recycling, Waste Treatment and Clean Technology|
|Keywords||Air control systems, Fly ash, Heavy metals, Hydrometallurgical treatments, Hydrometallurgy, Municipal solid wastes, Solvents, Sulfuric acid, Titanium, Waste treatment|
The incineration of municipal solid wastes produces several volatile heavy metals and these metals are vaporized as chlorides and concentrated in newly formed fly ash (FA) due to the application of the air control system to reduce the emissions of contaminants to the atmosphere. The FA produced during the incineration process is appreciatively within 10-30 kg of dry matter per ton of refuse. The FA contains many elements such as titanium that could be recovered instead disposed as hazardous waste. This investigation has shown that sulphuric acid leaching of fly ashes is effective where most of Ti was dissolved, then a selective recovery by solvent extraction is indispensable to obtain pure compounds. We have demonstrated that hydrometallurgical treatment of FA to recover some materials and in particular quaternary titanium is a potentially feasible method.