Wednesday, March 27, 2013

Refining to 99.95% Gold

by Steve Looser

Before using this information and education site you should agree that you alone are responsible for your own health and safety and that you will not hold the author of this site or any contributing authors and publishers responsible for any of your decisions or actions resulting from any information contained herein. You agree to do your research and accept full responsibility for your actions. If you agree to the statement above then continue reading and enjoy, if not we advise you to leave now or continue reading for learning only. I strongly recommend that you take a laboratory safety study course or lab safety class before proceeding with processes described in this book and do not work alone. I also suggest that you start with simple and basic refining methods before you attempt some of the more complicated ones. Also be easy on yourself, perfecting your skill comes with practice.

Preparing Scrap Gold for Refining
When precious metal bearing material is received from a customer it is weighed and copies of the gross weight received with the customer name and date, an order number, processing instructions and lot number are produced. Samples are taken and the material is sealed in a drum with a metal seal and identification. Processes for sampling vary depending on the material. Several samples are taken from the material. Samples are given to the customer, some are sent out for an independent assay analysis and some for your in house assay. In the case of raw metal it is melted, homogenized and poured into and ingot so drilling's can be taken as samples. If it is solutions you will need to draw liquid samples. If it is sweeps that must be incinerated it will have to go through a lengthy process that is described below. Before dissolving gold in aqua regia, (1 part nitric acid & 3 parts hydrochloric acid) make sure it is free from waxes, oils plastics, tar, any organic materials, sulfides, chemicals, etc. "Sweeps" material is often full of crushable materials like old broken crucibles, clay and glass as well as combustible materials like polishing dust, paper, waxes, common garbage and sometimes even food. 

I describe in full detail how to produce 999.5 Fine Gold and Silver in the Amazon Kindle Book. ...continue reading by clicking here : 
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This assay of 999.54 parts per thousand 
                                    from methods described above.

Steve Looser
Phoenix Consulting
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Precious Metals Industry and Markets