green crystals in stockpot

[patnor1011]

I had about 10l of waste AR, wash acids and water. I decided to get rid of it so I evaporated to about half, there was quite a lot of wash water included. After that I added several pieces of copper bars from heat sink. After few days when I went to check progress of copper being dissolved I found some small pieces there but quite large chunks (like ice hockey puck) of greenish/clear crystals. Is that normal? It never happened before, does that mean that I evaporated too much of water?

 

[Barren Realms 007]

Sounds like you evaporated the solution too much. I wouldn't bother adding water I would just add some more waste solution into the bucket and then let the crystals go back into the solution.

 

[Geo]

If the crystals are long needle like clusters, it most likely is copper chloride crystals. Take some from the solution and place them in a container. Once they are exposed to the air, they will dissolve back into a liquid sucking the moisture from the air.