Production of an iron powder commodity

a technology of iron powder and commodity, which is applied in the direction of transportation and packaging, process efficiency improvement, metal-working apparatus, etc., can solve the problem of not being able to recover valuable iron-bearing particles as powder, and achieve the effect of removing undesirable emissions into the atmospher

Inactive Publication Date: 2010-04-01
RECOVERY TECH LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]A still further object of the invention is to provide a de-oiling process that eliminates undesirable emissions into the atmosphere during the de-oiling of HSM sludge.

Problems solved by technology

Oils and greases (hydrocarbons) used as coolants and lubricants during HSM operations adhere to the iron-bearing particles contained in the HSM sludge, making it impossible to recover the valuable iron-bearing particles as a powder without first treating the sludge to remove the oils and greases.

Method used

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  • Production of an iron powder commodity

Examples

Experimental program
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Effect test

example 1

[0035]In the event the HSM mixture 2 comprises certain amounts of nanoparticle and ultrafine particle iron-bearing solids, water, and a particular single hydrocarbon, for example a light oil, a single heating cycle raises the chamber temperature through a temperature range that includes the steam surge temperature and a target temperature suitable for vaporizing the single hydrocarbon, in this instance 550° F. (288° C.) for the light oil. As the chamber temperature is elevated from ambient temperature to the target temperature, the above-mentioned steam surge removes any oil clinging to the solid particle surfaces. As the temperature approaches target temperature, the light oil begins to vaporize, and complete vaporization of the oil is realized at target temperature. The heating cycle is discontinued when the CEM 9 indicates that there are no hydrocarbon vapors evolving from the heated mixture. The reactor vessel 3 is then purged with hot nitrogen gas from supply 5 and the condensa...

example 2

[0036]When HSM sludge 2 comprises certain amounts of nanoparticle and ultrafine particle iron-bearing solids, water, and two or more particular hydrocarbons, i.e. light oil and grease from rolling mill stands, the de-oiling process includes a first and a second heating cycle. The first heating cycle includes the temperature that generates the steam surge within the oily mixture to free sticky or viscid hydrocarbons from the solid particle surfaces, and a lowest, or first, effective temperature for vaporizing one of the hydrocarbons contained in the oily mixture. In this instance, the first effective temperature is an exemplary 550° F. (288° C.), the boiling point temperature for the light oil. The off-gas is fed to condenser 12, and the condensate is fed along line 16 to a separator 17 where it is separated into water and a light oil or first hydrocarbon product. When the CEM 9 indicates an absence of hydrocarbon vapors in the off-gas, chamber 3a is purged with hot nitrogen gas to r...

example 3

[0038]Where HSM sludge 2 comprises certain amounts of nanoparticle and ultrafine particle iron-bearing solids, water, and at least three different hydrocarbons, for example light oil, heavy oil, and grease, the de-oiling process comprises at least three heating cycles. The first heating cycle is operated to raise the chamber temperature through the steam surge temperature range to the lowest effective temperature for vaporizing one of the hydrocarbons contained in the oily mixture as heretofore described above Example 2.

[0039]After the first heating cycle, condensate is separated into water and a first hydrocarbon product using condenser 16 and separator 17, chamber 3a is purged with hot nitrogen, and a second or next successive heating cycle step raises the chamber 3a temperature to a next higher effective temperature for vaporizing one the hydrocarbons contained in the oily mixture. In this example, the chamber temperature is raised to the predetermined boiling point temperature f...

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Abstract

The present invention is directed to an iron powder commodity and to a process for producing such iron powder commodity comprising dehydrating and de-oiling hot strip mill (HSM) sludge within an inert gas atmosphere contained in a reaction chamber; venting and processing reaction chamber off-gas into a hydrocarbon product; discharging from the reaction chamber a dry de-oiled iron powder commodity that contains nanoparticle and ultrafine particle iron-bearing solids, and beneficiating the discharged iron powder commodity into particles of similar properties.

Description

[0001]This is a continuation-in-part of application Ser. No. 12 / 409,571 filed Mar. 24, 2009, which is a continuation of application Ser. No. 11 / 016,136, filed Dec. 17, 2004 now U.S. Pat. No. 7,531,046 granted May 12, 2009.FIELD OF THE INVENTION[0002]The present invention is directed to the production of an iron powder commodity used in a wide variety of applications such as sintered components, magnetic products, chemical and pharmaceuticals, printing, welding, and others. The iron powder commodity is produced by de-oiling nanoparticle and ultrafine particle iron-bearing solids contained in hot strip mill (HSM) sludge generated in a steelmaking operation. More specifically, this invention is directed to de-oiling magnetic and non-magnetic nanoparticle and ultrafine particle iron-bearing solids contained within HSM sludge to produce a high value iron powder commodity. Oils and greases (hydrocarbons) used as coolants and lubricants during HSM operations adhere to the iron-bearing part...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F1/00B22F9/00
CPCB22F2998/00C22B1/005C22B7/005C22B7/02B22F1/0014Y02P10/20B22F1/052
Inventor LYNN, JOHN D.
Owner RECOVERY TECH LP
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