TY:	CONF
T1	- Alkaline hydrothermal treatment of the waste produced in the semi-dry flue gas desulfurization system
A1	- GROSCHE, LUCAS C.
N2	- Semi-dry flue gas desulfurization ash (SDA) is a byproduct generated from the desulfurization system of coal-fired power
station. The beneficial reuse application for SDA material is relatively undeveloped and this residue is underutilized. SDA
was used as raw material for the synthesis of zeolitic material by alkaline hydrothermal treatment. Different experimental
conditions, such as, reaction time, temperature, alkali hydroxide concentration and solid/liquid ratio were studied. Raw ash
material and synthesis products were characterized by XRD, XRF, particle size analyzer, TG-DTG-DTA and SDA was classified
according to Brazilian Environmental Regulations. The results show that SDA has a higher CaO and SO3 content. The major
minerals present in SDA are hannebachite, anhydrite, calcite, portlandite, gehlenite and sodium carbonate. The size of SDA
particles is around 0.399-355.656 μM with median diameter of 7.63 μM. Thermal behavior of SDA was characterized by the
existence of six and four stages under air and inert atmosphere, respectively. SDA can be classified as Class II A (non-dangerous/
non-inert) materials. The presence of zeolite hydroxysodalite confirms successful conversion of SDA into zeolitic material after
activation in NaOH solutions. Along with the zeolitic product katoite, hydrocalumite and Al-substituted tobermorite were
obtained. All the compounds formed present ionic exchange capacity. SDA utilization minimizes the environmental impact of
disposal problems and further enables application for treatment of wastewater.
UR	- http://repositorio.ipen.br/handle/123456789/31164
Y1	- 2017
PB	- No publisher defined