Larry J Lehtinen

US Patent:

7666318, Feb 23, 2010

Filed:

May 12, 2006

Appl. No.:

11/433393

Inventors:

Larry J. Lehtinen - Two Harbors MN, US
Jeffrey A. Hansen - Fort Wayne IN, US

Assignee:

Ferro, LLC - Gilbert MN

International Classification:

B01D 53/02

US Classification:

210914, 95107, 95134, 210660, 210688

Abstract:

There are provided methods and processes that employ a mercury-adsorbing granular material as a sorbent to remove mercury from fluids. The fluids can be waste fluids that result from manufacturing, processing, or other treatment processes or systems. The fluids can also be fluids that are treated in their natural state. The fluids to be treated may include water, air, sludge, slurries, gases from processing or furnaces flues, gaseous flows, liquid flows, and other gases and liquids. In one excellent form of the invention, the mercury-adsorbing material includes taconite tailings.

US Patent:

7901585, Mar 8, 2011

Filed:

Nov 23, 2009

Appl. No.:

12/592312

Inventors:

Larry J. Lehtinen - Two Harbors MN, US
Jeffrey A. Hansen - Fort Wayne IN, US

Assignee:

Ferro, LLC - Gilbert MN

International Classification:

B01D 53/02

US Classification:

210914, 95107, 95134, 210660, 210688

Abstract:

There are provided methods and processes that employ a mercury-adsorbing granular material as a sorbent to remove mercury from fluids. The fluids can be waste fluids that result from manufacturing, processing, or other treatment processes or systems. The fluids can also be fluids that are treated in their natural state. The fluids to be treated may include water, air, sludge, slurries, gases from processing or furnaces flues, gaseous flows, liquid flows, and other gases and liquids. In one excellent form of the invention, the mercury-adsorbing material includes taconite tailings.

US Patent:

20120210824, Aug 23, 2012

Filed:

Feb 14, 2012

Appl. No.:

13/396433

Inventors:

Larry J. Lehtinen - Gilbert MN, US
Lucas J. Lehtinen - Chicago IL, US

International Classification:

C22B 1/16

US Classification:

75770, 425500, 425506

Abstract:

There are provided methods, systems and processes for forming cold bonded agglomerates in the form of pellets, briquettes or compacts from iron oxide materials, such as iron ore concentrates. The cold bonded agglomerates have sufficient strength and durability to be handled and shipped without significant damage. Forming the iron ore concentrate product into agglomerates facilitates the shipment and handling of the product and places the product in a form that is suitable for use by a wider variety of iron making customer facilities. There are also provided methods, systems and devices for handling greenballs as they cure, and before they have gained sufficient strength for significant handling, stockpiling or shipping.

US Patent:

59720662, Oct 26, 1999

Filed:

Apr 22, 1997

Appl. No.:

8/841468

Inventors:

Larry J. Lehtinen - Westlake OH

Assignee:

Iron Dynamics, Inc. - Butler IN

International Classification:

C21B 1110

US Classification:

75 1063

Abstract:

The present invention provides a method for producing direct reduced iron in a continuous and efficient fashion, which includes providing a mixture of a particulate iron oxide composition and a particulate carbonaceous reductant composition; the mixture being substantially unagglomerated and having a moisture content of less than about 14% water by weight; positioning the mixture onto a rotary hearth furnace; subjecting the mixture to reducing conditions to reduce a substantial portion of the iron oxide, thereby producing sponge iron; and discharging the sponge iron from the rotary hearth furnace.