TECHNET Archives

October 1997

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"CSS Asia Co., Ltd." <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Fri, 31 Oct 1997 17:35:35 +0900
Content-Type:
text/plain
Parts/Attachments:
text/plain (74 lines)
Dear Mr. Sedlak:

Could you kindly send me a copy of the article?

Thankns in advance.


>>
>>At 11:24 28/10/97 -0500, you wrote:
>>>Marie:
>>>
>>>We do not supply anything in waste treatment, but as a chemistry supplier,
>>>we
>>>are intimately involved in the issue.   I advise you that the BEST thing
>>>that
>>>you can do to ease the issue, and cut costs is to separate your wastes, and
>>>treat them in different ways.
>>>
>>>The presumption is that the only issues that you have in your waste water
>>>are
>>>pH and dissolved heavy metals.
>>>
>>>Most of the time you can separate your waste streams into the following
>>>categories:
>>>
>>>1. Chelated, low, to neglible metal (rinses from resist strippers, alkaline
>>>cleaners, etc.)
>>>2.  Chelated, high metal, (Electroless Copper rinse, and bailout, ammoniacal
>>>etch rinse)
>>>3. Non-Chelated, high metal (microetch rinse, electrolytic plating rinse,
>>>etc.)
>>>
>>>On the first category, simple pH adjustment may be all that is required, do
>>>this, and put it down the drain, if the metal is low enough, do not allow
>>>the
>>>chelates to mix with category three, or you jack the cost of treatment to
>>>the
>>>sky.
>>>
>>>Category three can best be treated by pH adjustment, and precipitation of
>>>metal sludge.
>>>Cheap and simple.
>>>
>>>Category two is the big expense, and if you mix all your wastes, all the
>>>waste becomes category two waste.   This must be treated by ion exchange, or
>>>precipitation with special chemicals, like sulfides, or weird expensive
>>>organics, to remove the metals from the chelates.
>>>
>>>This is pretty general stuff, but it is very often overlooked as a powerful
>>>tool to assist and cut costs in waste treatment.
>>>
>>>If I can be of more assistance, contact me off line.
>>>
>>>Incidently, if you want to send me your fax number, I have an article on
>>>chelates and waste treatment that you might find interesting.
>>>
>>>Best regards,
>>>
>>>Rudy Sedlak
>>>RD Chemical Company
>>>

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
##############################################################


ATOM RSS1 RSS2