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 Mitigation of hazardous impacts of industrial waste on environmental elements
Tác giả hoặc Nhóm tác giả: Tatjána Juzsakova, Ákos Rédey, Alexandra Csavdári, Tamás Frater, Cuong Le Phuoc, István Raduly, Zsófia Kovács
Nơi đăng: THE INTERNATIONAL CONFERENCE AIR AND WATER - COMPONENTS OF THE ENVIRONMENT; Số: 8;Từ->đến trang: 25 – 27 March 2016;Năm: 2016
Lĩnh vực: Môi trường; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
The research was focused on red mud hazardous waste. Red mud is a waste of the bauxite processing industry obtained during the alkaline extraction of alumina from bauxite ore. The worldwide aluminum production has generated huge amounts of red mud for the past decades. Only in Hungary during the past decades about 55 million tons of red mud accumulated at different storages sites. In 2010 one of these storages cassettes ruptured at Ajka, Hungary and about 1 million m3 of red mud sludge flooded an area of 1000 ha killing people and causing the largest industrial catastrophe in the history of Hungary. Thus its storage exhibits potential threats due to it caustic future (material having pH=11-13) to environment, flora, fauna and human beings. The utilization of the red mud available in significant amounts is an important issue from environmental point of view and also from the reasonable use of the natural resources. There are two main objectives of studies. The first objective is the neutralization of the caustic red mud with acidic waste material to decrease the high pH value, and the second objective was to utilize the valuable metal content of the red mud as catalyst. Different acidic pyrolysis oils, bio-oils, PVC, acidic bio-wastes can be considered for neutralization purpose. The neutralization of the PVC wastes has been studied with red mud at elevated temperatures. In order to achieve the second objective the hydrodealkylation of aromatic compounds and hydrocracking of long chain hydrocarbons (e.g. hexadecane) in model reactions have been studied. It was observed that the red mud exhibits catalytic activity in the above given reactions
ABSTRACT
The research was focused on red mud hazardous waste. Red mud is a waste of the bauxite processing industry obtained during the alkaline extraction of alumina from bauxite ore. The worldwide aluminum production has generated huge amounts of red mud for the past decades. Only in Hungary during the past decades about 55 million tons of red mud accumulated at different storages sites. In 2010 one of these storages cassettes ruptured at Ajka, Hungary and about 1 million m3 of red mud sludge flooded an area of 1000 ha killing people and causing the largest industrial catastrophe in the history of Hungary. Thus its storage exhibits potential threats due to it caustic future (material having pH=11-13) to environment, flora, fauna and human beings. The utilization of the red mud available in significant amounts is an important issue from environmental point of view and also from the reasonable use of the natural resources. There are two main objectives of studies. The first objective is the neutralization of the caustic red mud with acidic waste material to decrease the high pH value, and the second objective was to utilize the valuable metal content of the red mud as catalyst. Different acidic pyrolysis oils, bio-oils, PVC, acidic bio-wastes can be considered for neutralization purpose. The neutralization of the PVC wastes has been studied with red mud at elevated temperatures. In order to achieve the second objective the hydrodealkylation of aromatic compounds and hydrocracking of long chain hydrocarbons (e.g. hexadecane) in model reactions have been studied. It was observed that the red mud exhibits catalytic activity in the above given reactions
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