Aqua Regia Process

Aqua Regia Process:

I will explain two different aqua regia process in this article. You can watch the video that I divide aqua regia solution into two parts. In the first method, I add urea in solution until reaction. Urea neutralized the nitric acid. After that, I added SMB powder directly I gold solution. Immediately, solution color turns into black color. One more special thing happened if you notice that.

Now the bubbles on the solution surface become white. This is a most important thing. If you will become an expert at this point then you will never face difficulty in aqua regia process. You will not need any stannous chloride test for gold. I also never use stannous chloride. If your solution foamy bubbles are yellow then the solution is pregnant and if foamy bubbles are white then gold is not in solution.

2nd Aqua Regia Method:

I did all this to clear your confusion for aqua regia process. You can also use directly SMB powder for gold extraction in aqua regia process. Sometimes, it will work and sometimes it will not work or take a lot of SMB powder. As you can watch in the video, I did not use urea in the second method. I directly added SMB but it did not work. Then, I dissolved SMB in water and added SMB solution in aqua regia. It worked and the solution turned into black color. You can use different methods in aqua regia process as you need. If you have any confusion about gold in solution. Then you can test it with stannous chloride. But first, test your self and examine the solution. This practice will increase your experience and take you to the next level.

I hope, you will learn many things from this article. If you like this or any problem in aqua regia process then comment below. Subscribe my channel Gold Recovery to stay tuned. THANKS

29 thoughts on “Aqua Regia Process

  • October 5, 2017 at 10:44 pm
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    a.o.a uma bhai. again a very informative post. now i have a question, i burn some mobiles and recover gold. next time i try but i got a blackish brown an some green color solition. it not neautrelise nitric acid. what to do please help me

    Reply
    • October 6, 2017 at 11:35 pm
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      Test solution for gold with stannous chloride.
      The green color shows that some copper is in solution.
      Filter black-brown powder and melt it.

      Reply
    • October 16, 2018 at 8:03 pm
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      can use this method for run of mine (Primary gold) ?
      and what type of Urea and Sodium setabisulfite ?
      Because I can not precipitate the gold from solution using Urea and Sodium setabisulfite.

      Reply
  • October 8, 2017 at 10:48 pm
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    thanks for reply. the solution color was green and black and some yellow colored. i filter buy i got nothing. i use sufuric acid and i got a white crystals. and they again solved inside solution untill i filter!

    Reply
  • December 14, 2017 at 7:47 pm
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    dear umer how can remove lead and aluminium in A-R Solution .already i used h2so4 but SMB not working gold dust not sat ell down. kindly help me…….

    Reply
      • December 19, 2017 at 7:54 pm
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        Dear umar i try this add more SMB and more water but no result solution gone light blue color .before its light green.. but no gold dust please give advise how can i do…….

        Reply
  • February 28, 2018 at 10:36 am
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    Salam kenal ūüôā
    Saya olah cellphone, pertama saya bakar sesuai dengan petunjuk anda di youtube.
    Akan tetapi sesudah di Aqua regia saya endapkan dengan SMB, hasilnya bagus dalam jumlah 2kg cellphone.Saya olah ulang dengan sistem yang sama dengan jumlah cellphone 10kg tidak jadi.cuman endapan seperti lendir putih.mohon solusinya Master ūüôā

    Reply
  • April 20, 2018 at 10:45 pm
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    Thanks for your valuable information my friend.

    Reply
  • June 24, 2018 at 6:27 am
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    Assalam Mr omar pls explain me the way
    When we crash the rock we put the dust in nitric acid first or what pls send me a video to my WhatsApp (00212661177261).thks br

    Reply
  • July 13, 2018 at 4:04 pm
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    salaam alaikum Umar.
    please i need info on why the dust i get is always dark and its very smooth and light. and my gold solution always turn black or brown, but then the dust under it looks dark and very light, when i filter it. it always goes with the solution water it doesnt stay under

    Reply
  • July 21, 2018 at 12:23 pm
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    I have a problem and I was wondering if i can get some help, (First time) 

    I had made up 2 solutions of HCL to dissolve the base metals on some PCB’s and old pins that i had collected, the other to was the Gold plated CPU’s (lucky enough had been given 10 Intel Pentium Pro old ones!).

    After washing the CPU’s and purifying them of base metals, I decanted the fluid and proceeded to make a A/R solution to which i added my CPU’s (fine i believe).

    Heres the problem I added the PCB and the gold pins directly into the A/R and completely forgot the wash and left overnight (what a plonker). 

    Woke up this morning with a Dark green cloudy liquid, to which I was mortified as it was not as i expected, I filtered immediately and witnessed the gold had been removed from the CPU’s and hopefully dissolved into the A/R¬†

    I believe Base metals have been dissolved into the solution (i.e copper,lead and alu) as it is DARK GREEN not a beautiful Yellow/Gold liquid.

    Alas my query from here how do I proceed, I have been scouring this forum for the last day and have read parts of HOKE and cannot find a solution to my problem.

    Reply
  • July 26, 2018 at 2:19 am
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    What is SMB , PCB does not understand?

    Reply
  • August 4, 2018 at 11:38 am
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    Dear Sir Asslamulaikum, i m Mohammad mahamudul hasan .I m from Bangladesh..i want to know about SBM powder..please tell me details of SBM powder ..what is this . what kind of this powder.

    Reply
  • September 18, 2018 at 12:45 am
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    after i dissolved golden pins .. i got the yellow gold water … then i add urea to neutralize nitric acid .. i dont know if i add much urea or not ..i kept adding urea seem i added excess .. but when i add sodium meta bisulfite i got much fizzy .. brown fumes .. so suffocation odor .. i thought the reaction is ok .. so i added much sodium meta bisulfite .. .. gold powder not precipitated .. and the solution become pale yellow green color …. i wish u advise me to solve this problem

    Reply
  • November 6, 2018 at 12:50 pm
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    Hello sir
    I have problem
    I can not retrieve gold from aqua Regia
    sometimes after adding urea white sludge creats to bottom of beaker and sometimes not
    When adding SMB, brown powder does not form and sometimes its pink
    I do not know where the problem is
    please guide me

    Reply
  • November 21, 2018 at 10:28 pm
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    Hcl available nahi he bhopal me kya karu sir bataye

    Reply
  • March 22, 2019 at 11:55 pm
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    Sir I add sodium metabisulfite in aqua regia without neutralizing it. No ppt are formed. Now tell me what I do about that. Black color solution is formed.

    Reply
  • June 10, 2019 at 7:40 pm
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    I done a same thing, but my aqua regia solution becomes light green color! will u please explain me why?

    Reply
  • June 18, 2019 at 7:53 pm
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    thank you for your helpful information
    I have a mistake in this process, i desolve electronic circutes gold layers in acqua regia, and achieve green solution, after that add some urea to that but nothing happend then add smd to that until melting stoped and the color of solution changed to dark brown and the smd setlled down, i think i add more of that, melting had been continuing for 4 hours and the smd was in bottom of glass so I added some acqua regia step by step to that to solve smd on it when i added that started melting rapidly with yellow and black foam after 3 haur melting stoped and i add some smd again and nothing happend i just have thick black brown solution with something white, black and yellow thing in bottom of glass, i dont know what i do after that processes!

    Reply

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