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From: Bahner, Mark A.

Sent: Wednesday, September 21, 2011 3:29 PM

To: Aaron Hill

Cc: Green, David A.; Rochelle Boyd

Subject: RE: United Iron & Metal Inc

Hi Aaron,

It was good talking to you again. As I mentioned in our phone conversation, my question deals with “rotary sweat 

furnaces.” When we last talked, I had unfortunately not brought any literature on “rotary sweat furnaces” for your 

review.

Attached are some links discussing the CORECO® Rotary Sweat Furnace:

http://www.enviroair.net/rotary-sweat-furnace/

http://www.enviroair.net/assets/Uploads/Sweat-Furnace.pdf

Here is another website that discusses the apparent use of these rotary sweat furnaces:

http://www.americanrecycler.com/0804spotlight.html

It contains this passage:

EnviroAir, Inc., of Eagle, Wisconsin, offers a variation of the conventional aluminum sweat furnace. Company president Doug Stenz explains, “Our design is a rotary kiln. There is a lot of 

scrap metal recovered today that is either zinc plated or aluminum coated. With a rotary kiln design, recyclers can process a mixed load of scrap, and still get clean ingots. Zinc melts at 

a lower temperature, so the operator can bring the furnace to that point, spin the kiln and draw off the molten zinc. Then the temperature is increased until the aluminum melts off and it 

too is recovered in the same manner. That leaves just the ferrous base metal parts,” he said. EnviroAir purchased the assets of the former College Research Corporation, retaining the 

CORECO brand for its sweat furnace line. 

Can you give any advice about how these “rotary sweat furnaces” fit into metals/aluminum recycling? Does the “rotary 

sweat furnace” have a clearly different place than a conventional sweat furnace?

As I mentioned in our phone conversation, please do not send me any information that your company might consider to 

be Confidential Business Information (CBI).

Thank you,

Mark

Mark A. Bahner 

RTI, International 

P.O. Box 12194, 3040 Cornwallis Road 

Research Triangle Park, NC 27709-2194 

Phone: (919) 541-6016 

Fax: (919) 541-7155 

Email: bahner@rti.org 

Internet: http://www.rti.org 
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From: Aaron Hill [mailto:ahill@arg-scrap.com] 

Sent: Tuesday, July 26, 2011 1:42 PM

To: Rochelle Boyd

Cc: Bahner, Mark A.; Green, David A.; Aaron Hill

Subject: RE: United Iron & Metal Inc

Rochelle

Monday, August 15 at 8:30 am will work fine.

I think the best option for accommodations are close to BWI airport. There are a number of good hotels in the airport loop 

which is only 5 minutes from the plant.

Regarding the permit to operate, the United Iron & Metal plant runs a hammer mill shredder to recycle obsolete 

appliances, automobiles and other scrap iron. There is no furnace or other smelting operation at this location. The 

shredder operation is not subject to Subpart RRR.

In the shredder operation, the scrap metal is pulverized by the hammer mill. The fragments of steel and iron are moved 

by conveyor and separated out by magnets. The remaining material is a combination of non-ferrous metal and nonmetallic waste. That mixed stream of material is screened by size and then run through eddy current and induction 

equipment to separate the non-ferrous metals from the waste. The eddy current equipment is a type of “reverse magnet” 

which repels non-ferrous metals. The mixed stream is run by conveyor over the eddy current roller and, with a simple 

splitter, the combined stream is divided into metal and non-metal categories. The majority of the metal residue is mixedalloy aluminum. The eddy current equipment is just one piece of the sorting process. The entire sorting process is the 

only set of equipment handling mixed aluminum scrap at this facility.

United Iron & Metal, LLC

PO Box 4452

909 Millington Ave.

Baltimore, MD 21223

410-947-8000

Aaron Hill

301-252-8270

From: Rochelle Boyd [mailto:Boyd.Rochelle@epamail.epa.gov] 

Sent: Tuesday, July 26, 2011 12:12 PM

To: Aaron Hill

Cc: Bahner, Mark A.; green@rti.org

Subject: RE: United Iron & Metal Inc

That will be fine. Can you send me the physical and mailing address of the facility, phone number, and contact name? I 

will send the safety form that I need completed once I have that information. Is this facility subject to Subpart RRR? If not, 

is the eddy separator the only piece of equipment handling mixed aluminum scrap? Is there a hotel nearby that you 

recommend so that I can check in on Sunday. I would like to arrive at 8:30 am on Monday. It will just be Mark Bahner 

and myself.

I will complete the safety form and send it once 

Rochelle Boyd, Environmental Engineer

U.S. Environmental Protection Agency

Office of Air Quality Planning and Standards

Sector Policies and Programs Division

109 T.W. Alexander Drive, RTP, NC 27711

Mail Drop D243-02

Ph: (919) 541-1390 Fax: (919) 541-3207

Email: boyd.rochelle@epa.gov
3

From: Aaron Hill <ahill@arg-scrap.com>

To: Rochelle Boyd/RTP/USEPA/US@EPA

Cc: "Bahner, Mark A." <bahner@rti.org>, "green@rti.org" <green@rti.org>

Date: 07/26/2011 10:16 AM

Subject: RE: United Iron & Metal Inc

Rochelle

I am out of town that day. What about the 15th on your way back from Philly?

Aaron

-----Original Message-----

From: Rochelle Boyd [mailto:Boyd.Rochelle@epamail.epa.gov] 

Sent: Monday, July 25, 2011 6:06 PM

To: Aaron Hill

Cc: Bahner, Mark A.; green@rti.org

Subject: RE: United Iron & Metal Inc

We have a deadline that week anyway. What about Friday the 12th, since

I have to be in Philadelphia on the 13th?

Rochelle Boyd, Environmental Engineer

U.S. Environmental Protection Agency

Office of Air Quality Planning and Standards

Sector Policies and Programs Division

109 T.W. Alexander Drive, RTP, NC 27711

Mail Drop D243-02

Ph: (919) 541-1390 Fax: (919) 541-3207

Email: boyd.rochelle@epa.gov

From: Aaron Hill <ahill@arg-scrap.com>

To: Rochelle Boyd/RTP/USEPA/US@EPA

Cc: "green@rti.org" <green@rti.org>, "Bahner, Mark A."

<bahner@rti.org>

Date: 07/25/2011 10:54 AM

Subject: RE: United Iron & Metal Inc

Rochelle

I need to be in New York on the 4th for a meeting - can we do the

walkthrough at United on Friday the 5th?

Aaron

From: Rochelle Boyd [mailto:Boyd.Rochelle@epamail.epa.gov]

Sent: Wednesday, July 20, 2011 11:10 AM

To: Aaron Hill

Cc: green@rti.org; Bahner, Mark A.

Subject: United Iron & Metal Inc

Hi Aaron, I have a class next Wednesday and Thursday and was wondering

if I could come up to visit the Eddy Separator on August 3rd or 4th.
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Please let me know. Thanks

Rochelle Boyd, Environmental Engineer

U.S. Environmental Protection Agency

Office of Air Quality Planning and Standards

Sector Policies and Programs Division

109 T.W. Alexander Drive, RTP, NC 27711

Mail Drop D243-02

Ph: (919) 541-1390 Fax: (919) 541-3207

Email: boyd.rochelle@epa.gov