Method for the non-leachable immobilisation of molybdenum compounds in a slag
CA 2351391 A1 · Owner: Van Der Giesen, Abraham Barend · Inventors: Van Der Giesen, Abraham Barend; Lotens, Jan Pieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the non-leachable immobilisation of molybdenum compounds in a slag by treating iron- and molybdenum-containing waste streams under reducing conditions for example under an oxygen pressure , of 10-6 to 10-12 bar advantageously 10-7.5 to 10-9.5 bar, at a temperature which advantageously is 50 ~C above the liquidus temperature of the slag and under a thermodynamic activity of Fe(II) in the slag of more than 0.5 the , Fe(III)/Fe(II) ratio in the slag being adjusted to a value of between 0.25 and 2. The resulting slag is then cooled in such a way that a solid solution of MoO2 in a spinel structure is obtained which spinel structure exhibits a very low …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.