Cannot precipitate gold from HCL and bleach

[jailes Norato de Jesus jú]

Olá! Estou postando isso por minha conta e risco e me retirarei do fórum se for considerado um problema. Acabei de começar a processar ouro e li o livro de Hokes. Recuperei com sucesso ouro de pedaços de computador. Meu problema é que dissolvi o ouro de pratos e copos em HCL e água sanitária, mas não consigo precipitá-lo com metabissulfito de sódio. Sim, há ouro na minha solução. Li o fórum e descobri que posso ter usado muito alvejante e que deveria aquecê-lo para remover o excesso de alvejante. Eu fiz isso, mas ainda sem resultados. O SMB efervesce e cai no fundo da minha solução. Se alguém puder ajudar, ficaria muito grato e ficarei feliz em ajudar outras pessoas enquanto aprendo o processo. Acredito que os fóruns são para as pessoas ajudarem outras e, com sorte, salvá-las dos longos processos pelos quais eu passo. Sou alguém que ajuda os outros, passando inúmeras horas pesquisando e experimentando e depois transmitindo meu conhecimento a eles. Obrigado,

 

[Ckbouda]

Pantherlikher,
I think you have done a very good job explaining this, and you went into good detail of the pH of the solution, which can become a very important factor when using sodium hypochlorite, especially with washing dishes where you can very easily use way too much basic bleach solution, basically destroying the acid, and keeping the gold locked up in a hypochlorite solution...

I have a question when try to precipitate gold with hydrochloric acid and hydrogen peroxide after the reaction is done do i have to excess the acid before do the precipitation?

 

[adam mizer]

Do you have ph strips or tester?
Yes you want it acidic I believe.
Also I believe the peroxide should have been minimal, or should be diluted some so as not to keep the gold in solution.
Do you have stannous test solution?

 

[Yggdrasil]

I have a question when try to precipitate gold with hydrochloric acid and hydrogen peroxide after the reaction is done do i have to excess the acid before do the precipitation?

HCl/Peroxide should be ok.
But a few hours hot may be needed to decompose the Peroxide.
The good thing is that the HCl/Peroxide do not suffer from high pH so one can go straight to SMB or your precipitant if choice.

 

[Shark]

If you used hydrochloric and peroxide, the acid should still be good if you didn't over heat it, or add large amounts of it. Peroxide won't neutralize the acid like bleach does. Keeping the PH down
usually will help with precipitation especially if using SMB.

I see others have helped but I will put this up as well.