Methods for immobilization of nitrate and nitrite in aqueous...

Hazardous or toxic waste destruction or containment – Processes for making harmful chemical substances harmless,... – Harmful chemical substances made harmless – or less harmful,...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

07361801

ABSTRACT:
The present invention relates to a method of immobilizing aqueous waste, including low level nuclear waste, by converting the waste to a solid. Solidification is accomplished with the addition of a compound having the formula Me(II)O or Me(II)(OH)2in combination with compounds of the general formula Me(II)O.R2O3, R2O3, R(OH)3or ROOH, where Me is a cation selected from the group consisting of Ca, Ba, Sr, Mn, and Zn, and R is selected from the group consisting of Al, Fe and Cr. Exemplary compounds of the above formula include commercially available calcium aluminate cements, which when added to the waste in combination with a hydroxide of a divalent metal, bind the nitrate ions or nitrite ions in the waste and convert it to a solid.

REFERENCES:
patent: 3274784 (1966-09-01), Shock et al.
patent: 4028265 (1977-06-01), Barney et al.
patent: 4274880 (1981-06-01), Chappell
patent: 4344872 (1982-08-01), Thiele
patent: 4354954 (1982-10-01), Koster et al.
patent: 4853208 (1989-08-01), Reimers et al.
patent: 4892685 (1990-01-01), Magnin et al.
patent: 5049412 (1991-09-01), Miller
patent: 5198082 (1993-03-01), Vennesland et al.
patent: 5269975 (1993-12-01), Noakes
patent: 5422141 (1995-06-01), Hoopes et al.
patent: 5435846 (1995-07-01), Tatematsu et al.
patent: 5498828 (1996-03-01), Matsuda et al.
patent: 5539140 (1996-07-01), Davidovits
patent: 5545797 (1996-08-01), Ewing et al.
patent: 5640704 (1997-06-01), Snyder et al.
patent: 5960368 (1999-09-01), Pierce et al.
patent: 6402990 (2002-06-01), Marazzani et al.
patent: 1258473 (1989-08-01), None
patent: 09286652 (1997-11-01), None
patent: 410231157 (1998-09-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Methods for immobilization of nitrate and nitrite in aqueous... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods for immobilization of nitrate and nitrite in aqueous..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for immobilization of nitrate and nitrite in aqueous... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2743051

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.