SLURRY OF MANGANOMANGANIC OXIDE PARTICLES AND METHOD FOR THE PRODUCTION OF SLURRY

• US 20130319295A1
• Filed: 09/14/2011
• Published: 12/05/2013
• Est. Priority Date: 09/17/2010
• Status: Active Grant

• Current Assignee: Elkem
• Original Assignee: Elkem
• Inventors: Al-Bagoury, Mohamed, Rostol, Vidar Frank
• Granted Patent: US 8,668,772 B2
• Time in Patent Office: Days
• US Class Current: 106/810
• CPC Class Codes: C04B 14/062 Microsilica, e.g. colloïdal silica preparing microsilica slurries or suspensions C04B18/148
• CPC Class Codes: C04B 14/30 Oxides other than silica ferrites C04B14/363
• CPC Class Codes: C04B 18/146 Silica fume
• CPC Class Codes: C04B 2103/20 Retarders
• CPC Class Codes: C04B 2103/408 Dispersants
• CPC Class Codes: C04B 2103/46 Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
• CPC Class Codes: C04B 22/062 of the alkali or alkaline-earth metals
• CPC Class Codes: C04B 24/2647 containing polyether side chains
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C09K 8/032 Inorganic additives
• CPC Class Codes: C09K 8/42 Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells compositions for plastering C09K8/50
• CPC Class Codes: C09K 8/467 containing additives for specific purposes
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A stable non-settling slurry of water and manganomanganic oxide particles having a particle size below 10 μm. The slurry comprises water and up to 92 wt % manganomanganic oxide particles bade on the weight of the slurry. The slurry has a pH between 9 and 11 and contains 0.05 to 0.5 wt % of a dispersant based on the weight of dry manganomanganic oxide particles. The dispersant can be an ethoxylated polycarboxylate or a polyacrylic acid salt and has a molecular weight between 500 and 50 000 g/mol.

Claims

1-14. -14. (canceled)

13. A stable, non-settling slurry comprising:

water;

manganomanganic oxide particles having a particle size below 10 μ

m, the manganomanganic oxide particles present in the slurry in an amount up to 92 wt % based on the weight of the slurry;

a dispersant in an amount of 0.05 to 0.5 wt % based on the weight of dry manganomanganic oxide particles in the slurry, the dispersant having a molecular weight between 500 and 50,000 g/mol and selected from an ethoxylated polycarboxylate and a polyacrylic acid salt; and

a ph of the slurry being 9 to 11.

14. The slurry of claim 13, wherein the amount of the manganomanganic particles present in the slurry is greater than 80 wt % based on the weight of the slurry.

15. The slurry of claim 13, wherein the amount of the dispersant is 0.07 to 0.15 wt % based on to weight of dry manganomanganic oxide particles.

16. The slurry of claim 13, wherein:

the dispersant is a polyacrylic sodium salt having a molecular weight of about 3000 g/mol.

17. The slurry of claim 13, wherein:

the dispersant is an ethoxylated polycarboxylate;

with a hydrophobic chain as a side chain.

18. The slurry of claim 13, wherein:

the ethoxylated polycarboxylate has a molecular weight of about 20,000 g/mol.

19. The slurry of claim 13, wherein:

the ph of the slurry is 9.5 to 10.5.

25. An oil well cement composition comprising cement powder, water and the slurry of claim 13.

21. A method of producing a stable, non-settling aqueous slurry of manganomanganic oxide, comprising:

Mixing manganomanganic oxide particles, water and a dispersant to form a slurry, wherein the manganomanganic oxide particles have a particle size below 10 and are presenting an amount up to 92 wt % based on the weight of the slurry, the dispersant is present in an amount of 0.05 to 0.5 wt % based on the weight of the dry manganomanganic oxide particles present in the slurry, the dispersant is selected from an ethoxylated polycarboxylate and a polyacrylic acid salt; and

the dispersant has a molecular weight of 500 to 50,000 g/mol; and

adjusting the ph of the slurry from 9 to 11.

22. The method of claim 21, wherein:

first, dispersant is added and mixed with the water;

second, sodium hydroxide is added and mixed with the dispersant and water mixture;

third, the manganomanganic oxide particles are added and mixed with the water, dispersant and sodium hydroxide mixture at a low rate of mixing;

fourth, after adding all of the manganomanganic oxide particles to the water, dispersant and sodium hydroxide mixture, a high rate of shear is applied to the water, dispersant, sodium hydroxide and manganomanganic oxide particle mixture to form the slurry.

23. The method of claim 21 wherein:

the ph of the slurry is adjusted with sodium hydroxide.

24. The method of claim 21, further comprising:

pumping the slurry through a sieve system to remove coarse particles having a diameter greater than 45 μ

m from the slurry, after the slurry has been prepared.