Dear Mr. Vigano:

1.  Are the IX beds treated in house when they become saturated or is
this service subcontracted; and how many cubic feet are the beds?

2.  If the IX beds are treated in house, how is the leachate treated?

I ask these questions because most solder strippers contain 300 - 700
g/L of total metal (lead, tin, and copper) when spent, and I had assumed
to concentrated to effectively treat via IX.  (And this concentration
exludes iron in the ferric based strippers.)

However, to address your questions:

1.  peroxide/biflouride strippers are sprayable AND many formulations
are not acidic - operating at a pH of 4-5; and

2.  I am not familiar with IX resins which are effective in the pH range
of 2.5.

I hope this is of some help.  If you have additional questions, please
feel free to call.

Regards,
Ted Stern
phone: 612-479-6525

Adeodato Vigano wrote:
>
> Ladies and Gentlemen,
> my company is evaluating conveyorized solder stripping equipment/chemistry
> and I'm facing a problem.  Our water treatment system is a selective IX
> system and the resin that we are using to extract lead requires a pH
> adjustment to approx 4 pH to be effective.  Now, the problem is that at
> about 3 pH the iron that is in most nitric based solder  stripping
> chemistries precipitates creating a huge mess.
> The chemistry that we are using now (in a vertical batch system) is iron
> free but I am told that a horizontal conveyorized system needs a ferric
> chemistry to be effective.
> Two questions:
> 1. is there a chemistry that is iron free AND will perform well in a
> horizontal setup?
> 2. is there a lead treating resin for ion exchange water treatment that
> works well at approximately 2.5 pH?
> Any help will be greatly appreciated
> Kiko Vigano
>
> ------------------------------------------------------------------------
> Adeodato Vigano
> Production Manager
> Compunetics, Inc. - PCB Division
> (412) 858-6115
> [log in to unmask]
> ------------------------------------------------------------------------
>
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