I read it after responding to people. Everyone was very cool getting right back to me so I gave the same courtesy. I have a chemistry (not professional, minimal training fair amount of experience) and have run many replacement reactions, mostly halogens but same idea. That and someone mentioned boiling to reduce the volume of my solution, which normally results in a thick sludge, so I was thinking maybe that was what was meant.
Thats a great chart to know because if something goes wrong with your solution you can get your metals to drop/cement out.
Do it again with the knowledge you acquire and it gets easier to deal with.
The boiling down part is slow but works well if needed. Actually helps in reduction of volume of waste liquid.
The point of boiling down to, not to a heavy sludge but to the point when the liquid just thickens up a bit slightly syrup like,
At this point you add some HCL and you can see the nitrogen gases coming out of solution when you have used too much nitric acid.
The sulfamic acid crystals work much quicker, we wrote about earlier.
You have to deal with waste. Healthy environment. Waste management is an important issue.
Some reading and soon this becomes easy to deal with.
Its possible some waste is reuseable at times.
Health and safety go hand in hand, it doesn't take much gas/fume to create issues and worst case loss of life or health.
Even outdoors, sometimes there is no breeze direction. Or direction of air movement changes.
A large fan can help at times.
In your case burning and roasting ore's there are unknown's of what is in there and one heavy wiff of it can poison or kill a person.
A person needs to be reminded of this constantly.
Kindly we are looking out for each other.
The words may not appear in a kindly manner, snarl, snip, chew, spit, however the meaning is for yours and others well being.
Its fairly easy to see how a person reacts to suggestions, attitude, how you react.
In the end its all good information. Best to take it in to better you in the long run. Don't make a short time of it.
Attitude is important, are you able to see the positive side of what is said and not take it as a negative statement.
This can go on and on.
Bottom line we look out for each other and as time goes on good methods develope that we all want to see.
The more you read you see these professional members, applied mineral and chemical science, equations, developed methods, patents, over my head but I am very interested.
We are lucky to be a member here at GRF.