Powder out of grinding optical lenses

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Date: Mon, 30 Jul 2001 17:11:32 -0400 (EDT)
From: studio@crystallo.com (Hugo Gavarini)
Subject: Powder out of grinding optical lenses

Hello,

I need some advice on recycling powder produced by grinding optical lenses. Following is a brief description of the facts.

Opticians should grind a lot of Crown optical glass, leaded glass (Flint glass) along with organic (CR-39) and policarbonate lenses to shape them.

They have an automatic machine with diamond wheels to achieve it. The machine has a disposal system, leaving all the glass (and plastic) paste, in a bag to be discarded. Since optical glass have a lot of lead, they can't throw it to be moved away by the garbage man.

In fact, they are willing to give the waste paste bag to anybody who were responsible for recycling and final disposal.

Of course, it will be necessary to run a separation process to recover the glass, but densities of plastic and glass are so different than it should be easy and cheap to separate the glass from plastics.

I am interested in recover glass powder (Crown and Flint glass), and
discard or recycle policarbonate and CR-39.

Thank you,
Hugo

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