A picture speaks many words.
I see a picture of someone cooking circuit boards over an electrically heated coil burner subjecting themselves and their neighbors to toxic fumes and deposits on the areas around them. The burner will not last long in the acidic environment of the volatile toxic acids coming from the circuit boards. a sand bath would be more helpful and the burner would last longer and be more efficient(under a fume hood, or outdoors away from population or living areas), the solder will collect in the sand bath...
One thing this picture says to me is that your a beginner, with some ideas and just enough of an understanding of the recovery and refining to be dangerous to yourself at this point and wish to go on a journey with a large-scale operation, before gaining an understand many of the basics.
snoman701 gave sound advice, smelting copper in a retort furnace and selling the copper or refining the copper ( a copper cell can be made easily (having a good power source is a requirement).
As a beginner in this, I would work on a small scale, maybe with several processes, gaining a good understanding with study and experimenting on a small scale, gaining an understanding of the processes, and how to perform them safely, much of what can be done on a large scale with large investments in expensive equipment, can be done safely with a small lab and easily available (sometimes homemade) equipment, the processes proven on a lab scale model can be scaled up, the process which proves difficult or failures on the small scale is not as devastating to your financial status, and these failures add to your education in the lab.
I say start this out small with educating yourself (which is what you are doing now), work on the safety portion of your study, what good is a few hundred grams of gold to a man dying from toxic fumes?
Start out with the small experiments of what you have gained from your study, from these small experiments gain an education of how things actually work and where the problems occur.
I would experiment with several different processes on a small scale, before deciding on a process to go big with, before investing much time and money to find it will not work out as planned or as the idea in my head.
Basically, I would spend time learning to recover and refine safely with several different processes on a small scale, gaining experience before jumping in on a large scale.