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Environmental problem in the rapidly changing today's society has remained as a serious problem that cannot be ignored. Lee Gigang taking lead in environment & growth, green environment, and trying to develop new technology is the professor of New Materials Engineering of Kyonggi University. He is the very man who has invented the new technology which enables industrial waste a pain in the neck to be used as industrial property. The scholar whose study passion is enduring is immersing himself in research day and night. 


The birth of Cinder Brick

Professor Lee who worked at Pohang Jecheol for three years bucked into the research of resources recycling, which was not surprising. At that time he encountered the recycling of waste from steel mill, which situation he started to give much attention to. The coal briquette carrier's words to deal with fly ashes made me recall brickmaking. The main ingredient of bricks is the soil scraped out from soil of a rice paddy. Since fly ashes is rich in silicon dioxide, this soil can be substituted, which he judged. The low circuit bricks only are used to build the six story building which was constructed next to the research building.

He was committed to the production of bricks until the mid-1990s. He took note of a pain in the neck "EAF dust" containing twenty percent of harmful heavy metal, and hundreds of thousands of tons of the dust is generated each year. Million tons of heavy metal is the massive amount enough to kill the whole nation of Korea. So the whole quantity of the dust has to be melted and reclaimed, after being treated hard with cement and the way of dealing with it is very strict. He analyzed the ingredients of EAF dust, found the value of ground-breaking raw materials, and applied it to the construction of bricks, with which technology he got a patent in 1990. He obtained the order for pilot project of Korea Energy Management Corporation. Since then, he purchased an brick factory, made and sold over one hundred million bricks using the wastes. 

Making one brick contained 40% of wastes, and its making and selling one hundred million bricks, which means he recycled 4000 tons of wastes. This has a huge environmental significance besides economic one. The demand of disposing waste materials was high, but there was a lack of the disposal facilities. So the "Frontier Project" of professor Lee has made a enormous accomplishment. 


Artificial Lightweight Aggregates Save the Environment

The project of making bricks or aggregates is being promoted in order to dispose 50 million tons of wastes efficiently which is generated each year. The facilities and production complex producing artificial lightweight aggregate 40% lighter than normal one was built April in 2010 next to Youngheung thermal power station Ongjin-gun of Incheon. This is the factory where we produce artificial lightweight aggregate using cinder of thermal power station, from which we can make eco-friendly and added value of products together with the expansion of employing people and saving effects. The factory taking lead in environment and economic development produces 200,000§© of artificial lightweight aggregate, and it is the world's first production and facilities plant.  

The fly ashes is generated from burning coal for thermal power generation, and the one ash used for the raw materials of cement whose particle is very fine, and the other ash is incapable of being recycled. Eight million and three hundred forty thousand tons of ashes was generated as of 2009, 3.1 million tons of which cannot be recycled, and thrown out. The cost of 50 billion w on is being injected to dispose low ashes. Especially, the ash-disposal place made out of blocking up the sea will overflow after three years, which may be expected to cause a serous problem. 

From this point of time, since we make artificial lightweight aggregate out of various dust of wastes being generated from industrial sites which is substituted for the raw materials of aggregate, the construction of Youngheung power plant is the most effective way for us to reduce the cost of constructing and extending a large scale of ash-disposal plant, and we can solve the various environmental problems which are generating from reclaiming coal ashes.   


"The incinerated wastes such as coal ashes, dust of metal mill, scrapes from the meals is not metal but ceramic which can be recycled." Steelmaking dust of the electric furnace from melting scrap iron in the steel mill, spent bleaching clay from oil manufacture processes, coal ash, stone powder sludge containing the same ingredient of tailing are the best raw materials used for recycling. 

Professor Lee Gigang emphasized that we should understand the recycling of wastes as the concept of recycled resources. "It is not until the change in the mind-set is consummated, ? from understanding wastes as big trouble things we should throw away and dispose of, to as circulating "resources" that true eco-friendly business has the requisite qualifications for it" he underlined.

Environment is the most important vital component in our lives. We hope that professor Lee's research of circulating resources of wastes and development of new technology can mark a new era in the development of environmental technology, and that by rectifying the nation's negative cognition of recycling wastes the use of it can be widely known, which achieves a remarkable economic development.


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