Questionmy company is manufacturing cnc make gold bangles and rings we are having lot of scrap in form of gold and some what of sand dust my factory is located in industrial area so we are having lot of dust in form of iron particals this partical some what mix whith our sand dust so we accumulate this dust in different contanior for this sand how we can refinend through aqua regia and also we do continous casting so sometimes gold is been melted with iron rod from this iron rod how can we refinied the gold please let me know the following steps thanking you mayur
AnswerHello Mayur,
Though this question is very detailed I will try to help however i cannot answer it in the small amount of time i have today/ at the moment. It is also very technical. I do consulting work in this field and I estimate that preparing a virtual technical manual will take me about 6 hours to type out. I also need some further details if I am to do this for your company and to know the volume of manufacturing that goes on in the building in , say , a weeks time:
1)are the particles generated from WITHIN your factory, or do you have dust collection equipment installed in the refining room?
2)Do you have dust collection equipment installed in the CNC/casting room?- are the rooms separated?
3)are the rooms all in one large space, and do you have a budget that allows for separating the spaces?
4)Have you ever used aqua regia before? If so you know that all the alloy in the material, iron and silver will be lost when placed in the nitric acid.
5)What size nitric acid tanks do you have on hand and how much scrap would say is generated in a week?
I need all these answers before I can give you a detailed answer that will actually separate out the refining and the environmental cleaning steps. One cannot happen with any degree of accuracy without the other- For example if you have iron dust in the atmosphere inside your milling room then it is tracked into the refining room you are guaranteed to have an impure casting when you pour then roll out the ingots to useable stock.You will get material ( gold) that will split and fracture upon rolling it out no matter how much annealing is put to it.
I also require that to do this job, you give me at least 5 days. If that is acceptable, I will agree to help out. You can also go to the archives at ganoksin.com, and search there for answers to similar questions regarding refining of gold using aqua regia and other related topics, also MAKE.com has ways to set up your own home made dust collectors which you can then refine in a large furnace and reclaim the scrap that can be further refined into usable material.A dust collector is essential if there is ferrous metal in the building, or if you have a dirt floor, or and that are tracked into the facility.
If you company would like me to come there to consult on the matter and set up a clean facility that maximizes the scrap usage and minimizes the waste, and contaminants in the facility I will be happy to do so. You can contact me out of this forum,at vieuxcarrejewelers@gmail.com, to discuss doing this in person or by email or net meeting- for which I would do a virtual tour of the facility and produce a detailed report and give you the technical methods for reclamation, scrap refining and re-use and setting up a clean room in which to do these operations that eliminate ferrous metal and other contaminants, using equipment on hand ( such as vacuum cleaners, dust collectors, and simple parts) that can be in place quickly and will save your company much money in casting grain and reuse of milled waste that can be recollected and refined simply with nitric acid and ammonium sulphate ( sal mmoniac can be added to powdered charcoal and added to the crucible in the melting process that helps to remove any left over impurities from the molten metal with an implement such as a graphite rod) in the basic processing of scrap to increase the return on your investment of gold in its raw form.I can also recommend some industrial equipment that may be of use and the cheapest sources of buying it that will help not only clean the product but make for a healthier environment for the companies employees whose health should be of more importance than the reclamation of the gold!
So if you want my help you must allow at least 5 days for me to prepare a report, after I receive your answers to the above basic questions, and if you want my services contact me off this forum for a much more detailed and designed for your specific location answer and technical brief to implement as a managerial or executive programme for operations and resources management.It can be done without my traveling to India, or wherever your location is- and over the internet.But I will need more time and some allowances that are not in place on allexperts.com to do so such as the 3 day limit they impose on experts answering questions.
I do hope to hear from you, Ari
