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US 6,710,001 B2Granted
Porous sintered body
AssigneeInax Corporation
InventorsOsamu Watanabe, Shuji Kawai
Life of this patent
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Abstract
A porous sintered body in which the leaching amounts of heavy metals are small and having high availability contains 0.5-15 weight % of B2O3, preferably contains 20-60 weight % of Al2O3, 18-60 weight % of SiO2, 1-12 weight % of the sum of Na2O, K2O, Li2O, and P2O5, 1-30 weight % of the sum of CaO, SrO, BaO, and MgO, and 0.5-15 weight % of B2O3.
Claims20
A porous sintered body containing 20-60 weight % of Al2O3, 18-60 weight % of SiO2, 1-30 weight % of a sum of CaO, SrO, BaO, and MgO, and 0.5-15 weight % of B2O3, wherein
- a leaching amount of Cd is 0.01 mg/l or less;
- a leaching amount of Pb is 0.01 mg/l or less;
- a leaching amount of As is 0.01 mg/l or less;
- a leaching amount of Se is 0.01 mg/l or less;
- a leaching amount of Cr+6 is 0.05 mg/l or less ;
- and
- a leaching amount of total Hg is 0.0005 mg/l or less;
- the above amounts being measured according to Environmental Quality Standards (EQS) for soil pollution by Japanese Ministry of the Environment.
5 more elements
Dependencies are inferred from the claim text.