Rubbles from the stricken sites will be reused as a part of raw materials for cement
[From Ohfunato City-my stricken home town]
– East Japan Great Earthquake & Tsunami Disaster-
Taiheiyo Cement Co. will equip centrifugal separator for salt contained in the rubbles by the end of this year
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| The Ohfunato Plant of Taiyeiyo Cement Co. and its incinerator |
The Ohfunato Plant of Taiheiyo Cement Corporation decided using rubbles from tsunami stricken areas after burnt up in the incinerator as a part of raw materials for its products on July 30. One of the largest cement production companies in Japan plans to equip newly centrifugal separator by the end of this year, and dispose of rubbles 300-500 tons a day. The rubbles from the tsunami stricken areas usually contain a high concentration of salt which obstructs their final disposal. There is possibility of accepting in other cement plants if those rubbles can be used as raw materials.
The Ohfunato Plant has accepted large amount of rubbles from the stricken sites in the cities of Ohfunato and Rikuzen-takata and incinerated at their production line since in June. They are disposing rubbles with great care on its production line because there is possibility of danger that a high concentration of salt in the rubbles will give damages to the incinerator. And about 30% refuse usually remains after the incineration which shall be buried in the ground.
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| The rubbles from the stricken sites will be used as a part of raw materials for cement |
Cement is basically made from mixture of limestone and clay, but recently industrial refuses are used as substitutes of raw materials, which have similar components. However, if those refuse contain a high concentration of salt, they are not suitable as substitute raw material for cement, because it reduce the strength and sometimes rusts iron reinforcing rods in the building. The rubbles from the tsunami stricken sites usually contain the maximum 2% of salt and it is hard to reduce its tolerance level of below 0.1% simply by wash off in water. The cement company will invest about 1 billion yen for new centrifuge system for separation of salt from the rubbles in their production line.
The cement plant in Ohfunato City was also greatly damaged by the tsunami on March 11. One of two incinerators has been operated for disposing of the rubbles from Ohfunato and Rikuzen-takata, but final refuses are simply buried in the ground Another damaged incinerator will be ready for full restarting of production line in November. If the new centrifugal separator is equipped in their line, final refuses in the incinerator can be used as a part of raw materials.
＜Reference＞
http://mainichi.jp/
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