Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2006-05-23
2006-05-23
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C210S716000, C210S724000, C210S726000, C210S912000, C252S175000
Reexamination Certificate
active
07048860
ABSTRACT:
This invention relates to a method for treating acidic waste water, particularly mine effluent, and to a solid waste water treating material useful for the method. This waste water treating material is obtained by solidifying a mixture of rock wool and an inorganic binder mainly containing at least one kind selected from silicates, hydroxides and oxides of alkaline earth metals and alkali metals and has a porosity of 50% or more. When brought into contact with acidic waste water containing iron ions and sulfate ions, this waste treating material can not only neutralize the waste water but also remove harmful heavy metals such as iron and arsenic. Furthermore, it is easy to dispose the spent waste water treating material.
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English Translation of International Preliminary Examination Report for PCT/JP02/03118 completed on Mar. 26, 2003.
International Search Report for PCT/JP02/03118 mailed on Jul. 2, 2002.
Hruskoci Peter A.
Nippon Steel Chemical Co. Ltd.
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