- Joined
- Mar 13, 2012
- Messages
- 315
I have a few questions regarding waste acid disposal. I have been following the suggestions found here on the forum. Here are my questions-
1.) After raising the ph to about 2.5 using soda ash I then add steel to drop out copper and other metals. I leave the steel (rebar) in the Acid for about 4-5 days then decant off the liquid, then run the resulting sludge through a filter. I rinse this a few times and dry it out and store it in a container. Is this dried material safe to toss in the trash or should it be taken to the local hazardous waste treatment facility? If I take it to the hazardous waste facility what should I label it as, being it might have some other metals in it other than just copper?
2.) Now I have an acid solution that is saturated with iron. I use sodium hydroxide to drop the iron. I then filter this so that I end up with a black sludge, which eventually turns brown. I read another post that said if you rinse this well you can dry it out and dispose of it in the landfill/trash. This would be ok if it did not take so long to filter. If I take this stuff to the local hazardous waste treatment facility what would I label the bucket- ie: iron hydroxide? iron oxide? iron II oxide? I want to order some magnesium hydroxide for this as I understand the resultant sludge from using it is much easier to filter. If I use magnesium hydroxide for this what would I label the bucket then?
3.) Since I am not interested in processing the copper, or any other pm's for that matter, in step one above can I cut to the chase and just drop all metals at one time, after raising the ph to about 2.5, using sodium hydroxide? If so what would the resultant sludge be called? In other words what would I label the bucket containing it as?
I always test my acids with stannous before dumping them into the waste bucket and they always come out negative for AU. Thus I am not concerned with losing any values by going directly to dropping copper and other metals with steel right off the bat.
Thanks in advance for any advice,
Dennis
1.) After raising the ph to about 2.5 using soda ash I then add steel to drop out copper and other metals. I leave the steel (rebar) in the Acid for about 4-5 days then decant off the liquid, then run the resulting sludge through a filter. I rinse this a few times and dry it out and store it in a container. Is this dried material safe to toss in the trash or should it be taken to the local hazardous waste treatment facility? If I take it to the hazardous waste facility what should I label it as, being it might have some other metals in it other than just copper?
2.) Now I have an acid solution that is saturated with iron. I use sodium hydroxide to drop the iron. I then filter this so that I end up with a black sludge, which eventually turns brown. I read another post that said if you rinse this well you can dry it out and dispose of it in the landfill/trash. This would be ok if it did not take so long to filter. If I take this stuff to the local hazardous waste treatment facility what would I label the bucket- ie: iron hydroxide? iron oxide? iron II oxide? I want to order some magnesium hydroxide for this as I understand the resultant sludge from using it is much easier to filter. If I use magnesium hydroxide for this what would I label the bucket then?
3.) Since I am not interested in processing the copper, or any other pm's for that matter, in step one above can I cut to the chase and just drop all metals at one time, after raising the ph to about 2.5, using sodium hydroxide? If so what would the resultant sludge be called? In other words what would I label the bucket containing it as?
I always test my acids with stannous before dumping them into the waste bucket and they always come out negative for AU. Thus I am not concerned with losing any values by going directly to dropping copper and other metals with steel right off the bat.
Thanks in advance for any advice,
Dennis