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but what kind of goop came off in it when it was used for stripping parts?

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Iron, and the stuff you were going to scrape off anyways. Once neutralized, no big deal.

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Maybe, although the neutralizing itself does little to remove potential heavy metal toxicity, and technically, its far from legal to dump or dispose of haphazardly of any of the waste product.

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Virtually everything you stated is incorrect.

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the real issue is, how do you get rid of the stuff when you are done?

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Better put your tinfoil hat back on and look under the bed for the boogeyman!

There is a heck of a lot of difference between iron and "heavy metals".

Neutralized acid is just that, NEUTRALIZED. It's not acid any more. Where I live the soil is basic, adding acid to the soil can actually make things grow better. In other parts of the US, the soil is acidic. What do you thing forms when dead leaves soak in a puddle of water? Tannic acid. What do you think when pure rainwater falls through the air that has some carbon dioxide in it, as Al Gore is so fond of reminding us? Carbonic acid. Acids and bases occur everywhere in nature.

On the other hand, anyone who dumps the contents of a lead/acid battery is putting more lead into the environment and needs to have a .45 caliber lead injection to make him stop. That's real.

Moparts is the place where everything can be made much more difficult and cost-prohibitive if one listens to all the advice.

R.

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Your answer did not disappoint me in more ways then you likely would understand, thank you.

And AndrewH, I believe heavy metals are a concern, what the part was plated with and likely removed by the acid, or what alloys were used in the base metal, could become a part of the waste stream, ie cadmium in the plating , chrome in stainless, lead residue inside the exhaust manifold, etc

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They put muriatic acid and chlorine in pools and your kids drink it, how they doing?

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All you safety nuts are a hoot. I'm in the wood industry and every day something new comes up that i say "Do What". The last one was safety data sheets on sandpaper. Man is such a terrible animal I guess we just should take the dead pill and be done with us all, or just go live in a cave and pick berries and nuts. We are talking 5 gallons at the most, worst stuff comes out of the air and runs off my roof. Heavy metals, what does it do when it just sets there and rusts? Its all about proportions,parts per million,take that 5 gallons and pour in the ocean,can you measure it? They put muriatic acid and chlorine in pools and your kids drink it, how they doing?

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Name calling, and you just don't get it.

Next.

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but what kind of goop came off in it when it was used for stripping parts?

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Iron, and the stuff you were going to scrape off anyways. Once neutralized, no big deal.

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Maybe, although the neutralizing itself does little to remove potential heavy metal toxicity, and technically, its far from legal to dump or dispose of haphazardly of any of the waste product.

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Virtually everything you stated is incorrect.

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We are talking about the location being in the US, in 2014, correct?

Care to stick around and back up that blanket statement?


So do you care to explain to us less informed how a heavy metal is rendered non toxic by a "neutralization"?


Or explain how any involved regulatory agency will turn a blind eye to haphazard disposal of the remnants/byproducts of a unregistered personal metal acid cleaning operation?

And explain how anybody here can tell with certainty what materials, surface or base metal alloys they are removing from a dirty item without any testing?

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. . While gagging from momentarily opening and closing the ice chest with 3 gallons of 30% Muratic Acid.

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I'm no save-the-earth-peta-global-warming's-gonna-be-the-end-of-human-exitance kinda guy myself, but it was this comment above that caused me to respond initially. If you don't care about the environment, at least care about your own body. Those fumes gag you for a reason. They are just as caustic as the liquid. AXC is lucky the outer layer of his eyeballs didn't shrivel up or his sinus linings didn't derust (burn and scar) Hard to drive our Mopars when we can't breathe or see.

Just say'n

Scott

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but what kind of goop came off in it when it was used for stripping parts?

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Iron, and the stuff you were going to scrape off anyways. Once neutralized, no big deal.

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Maybe, although the neutralizing itself does little to remove potential heavy metal toxicity, and technically, its far from legal to dump or dispose of haphazardly of any of the waste product.

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Virtually everything you stated is incorrect.

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We are talking about the location being in the US, in 2014, correct?

Care to stick around and back up that blanket statement?


So do you care to explain to us less informed how a heavy metal is rendered non toxic by a "neutralization"?


Or explain how any involved regulatory agency will turn a blind eye to haphazard disposal of the remnants/byproducts of a unregistered personal metal acid cleaning operation?

And explain how anybody here can tell with certainty what materials, surface or base metal alloys they are removing from a dirty item without any testing?

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Sure.

First, you need to be clear what heavy metals are you talking about. Carbon steel and cast iron have very very little heavy metals of concern. Do you know what they are and common concentrations in acid baths? Do you know the valences? If you don't, saying things like it's toxic, or hazardous are meaningless statements.

Next, do you know the route of entry? For the very low concentrations of of these metals, in this form, ingestion is the only realistic route of entry. So, I would recommend not eating the stuff, and maybe washing your hands when you are done.

Finally, neutralization IS the treatment technology for the heavy metals that we are talking about. They precipitate and become insoluble hydroxides. To maximize the treatment, raising the pH to about 9.0 with your neutralizing agent will bring these heavey metals near the drinking water standards in the water phase.

If you are talking about acid cleaning long terne coated items (such as fuel tanks) or cadmium plated items, that would certainly be a different story. The concentration in the acid would be higher of a couple heavy metals, but the neutralization would still be effective.

I would not be an advocate of dumping the stuff on the ground, but bagging it up and disposing of it in your trash would be both legal and safe. If there are remaining neutralized liquids, the local POTW can easily manage that as well. If you are a business, you should probably conduct the appropriate leach test for liability reasons as your responsibilities are different than residential/homeowners.

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And if there is ANY stainless involved, with the OP's process, chromium is likely present in the process, and the the current federal water limits I believe for toxicity is, wait for it, 0.00ppb.
You and I are the only ones who have even mentioned the complications of cadmium, the rest?

The arrogance of ignorance maybe comforting to some, but trying to understand a process beyond the immediate concerns of rust removal, I guess for many requires too much responsibility.

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but what kind of goop came off in it when it was used for stripping parts?

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Iron, and the stuff you were going to scrape off anyways. Once neutralized, no big deal.

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Maybe, although the neutralizing itself does little to remove potential heavy metal toxicity, and technically, its far from legal to dump or dispose of haphazardly of any of the waste product.

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Virtually everything you stated is incorrect.

---

We are talking about the location being in the US, in 2014, correct?

Care to stick around and back up that blanket statement?


So do you care to explain to us less informed how a heavy metal is rendered non toxic by a "neutralization"?


Or explain how any involved regulatory agency will turn a blind eye to haphazard disposal of the remnants/byproducts of a unregistered personal metal acid cleaning operation?

And explain how anybody here can tell with certainty what materials, surface or base metal alloys they are removing from a dirty item without any testing?

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Sure.

First, you need to be clear what heavy metals are you talking about. Carbon steel and cast iron have very very little heavy metals of concern. Do you know what they are and common concentrations in acid baths? Do you know the valences? If you don't, saying things like it's toxic, or hazardous are meaningless statements.

Next, do you know the route of entry? For the very low concentrations of of these metals, in this form, ingestion is the only realistic route of entry. So, I would recommend not eating the stuff, and maybe washing your hands when you are done.

Finally, neutralization IS the treatment technology for the heavy metals that we are talking about. They precipitate and become insoluble hydroxides. To maximize the treatment, raising the pH to about 9.0 with your neutralizing agent will bring these heavey metals near the drinking water standards in the water phase.

If you are talking about acid cleaning long terne coated items (such as fuel tanks) or cadmium plated items, that would certainly be a different story. The concentration in the acid would be higher of a couple heavy metals, but the neutralization would still be effective.

I would not be an advocate of dumping the stuff on the ground, but bagging it up and disposing of it in your trash would be both legal and safe. If there are remaining neutralized liquids, the local POTW can easily manage that as well. If you are a business, you should probably conduct the appropriate leach test for liability reasons as your responsibilities are different than residential/homeowners.

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So what percentage, if any here, comprehend your statement:
"Finally, neutralization IS the treatment technology for the heavy metals that we are talking about. They precipitate and become insoluble hydroxides. To maximize the treatment, raising the pH to about 9.0 with your neutralizing agent will bring these heavey metals near the drinking water standards in the water phase."

And if there is ANY stainless involved, with the OP's process, chromium is likely present in the process, and the the current federal water limits I believe for toxicity is, wait for it, 0.00ppb.
You and I are the only ones who have even mentioned the complications of cadmium, the rest?

The arrogance of ignorance maybe comforting to some, but trying to understand a process beyond the immediate concerns of rust removal, I guess for many requires too much responsibility.

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