3m Innovative Properties Company

Minnesota Mining and Manufacturing Company

Michael J Sierakowski

Patricia M Savu

Jennifer E Waddell

Chetan P Jariwala

Michael S Terrazas

George G I Moore

Rudolf J Dams

Miguel Antonio Guerra

George G Moore

Jerald K Rasmussen

William M Lamanna

Clinton P Waller, Jr

Lian Soon Tan

Karl D Weilandt

L Charles Hardy

John J Schmidt

Bryan J Johnson

Frank A Lee

Ann T Anich

A coalescing element for aggregating droplets of an emulsion. The coalescing element includes a nonwoven web substrate. A coalescer that includes the coalescing element can also include a housing and a fluid inlet and a fluid outlet each in fluid communication with the coalescing element. The coalescing element and coalescer may be useful for emulsions that form in solvent extraction/electrowinning copper processing and for other emulsions.

Coalescing elements in copper production

A composition comprising a nonionic fluorinated polymeric surfactant having a weight average molecular weight of least 100,000 grams per mole, the nonionic fluorinated polymeric surfactant comprising: divalent units independently represented by formula (I): in a range from 30% to 65% by weight, based on the total weight of the nonionic fluorinated polymeric surfactant; and divalent units independently represented by formula (II): in a range from 70% to 35% by weight, based on the total weight of the nonionic fluorinated polymeric surfactant. Ris a perfluoroalkyl group having from 3 to 4 carbon atoms; R and Rare each independently hydrogen or alkyl of 1 to 4 carbon atoms; Ris alkyl of 16 to 24 carbon atoms; and n is an integer from 2 to 11. Foams comprising the nonionic fluorinated polymeric surfactant and a liquid hydrocarbon and methods of making and using the foams are also disclosed.

Fluorinated surfactants and methods of using the same

Described are polymeric surfactants which include a fluorinated moiety and a non-fluorinated moiety where the fluorinated moiety contains two perfluoro-lower-alkyl sulfonamido segments in proximity to each other ; the surfactants provide more efficient and effective lowering of the surface tension of liquids and increase of wetting of a coating on a substrate surface.

Fluorochemical polymeric surfactants

Electrolytic solutions containing organic additive(s) selected from a described class of additives (e.g., 4,6-dihydroxypyrimidine) reduce overall applied electrical potential of electrolytic cells and/or reduce gas formation at the anode(s) or increase copper production rate. Benefits include reducing overall power consumption and reducing acid mist during electrolytic processes.

Electrolytic processes with reduced cell voltage and gas formation

Described are monomeric fluorosurfactants having two perfluoro-lower-alkyl sulfonamido segments which are more efficient and effective in lowering the surface tension of organic solvents and water compared to other C4-based fluorosurfactants.

Compositions of monomeric surfactants

The present invention provides imide salts as emulsifiers for the polymerization of fluoroolefins.

Imide salts as emulsifiers for the polymerization of fluoroolefins

A method for improving the recovery of gold and silver from precious metal ore is disclosed. The method comprises contacting precious metal ore with an aqueous solution containing certain fluoroaliphatic surfactants.

Leaching of precious metal ore with fluoroaliphatic surfactant

This invention provides an improved method of leaching precious and base metal values from ore comprising contacting a metal-bearing ore or ore concentrate with an oxidizing gas solution comprising a solution of an oxidizing gas dissolved in a perfluorinated liquid, said contact being made prior to or during extraction of the precious or base metal from the ore. In another aspect, this invention provides a method of destroying cyanide from a cyanide-containing solution comprising contacting said solution with a solution of an oxidizing gas dissolved in a perfluorinated liquid.

Fluorocarbon fluids as gas carriers to aid in precious and base metal

The formation of acid mist or spray over metal electrowinning tanks, such as in the electrowinning of copper obtained by solvent extraction, is substantially inhibited or eliminated by electrowinning the metal from electrolyte containing certain fluoroaliphatic non-foam-forming surfactants.

Mist suppressant for solvent extraction metal electrowinning

Improved methods of heap leaching of copper ore with aqueous sulfuric acid solutions comprising a fluoroaliphatic surfactant are disclosed. The fluoroaliphatic surfactant increases the amount of copper values leached and recovered.

Growing community of inventors

Stillwater, MN, United States of America

Michael J Sierakowski