How can you produce potassium gold cyanide give detail?

Answer 1

how I make PGC : 1. Make aquaregia (75% HCL + 25% HNO3) from high grade chemical. 2. Introduce the Gold (24 kt) in bulk or small piece in warm aquaregia for fast soluble. (gold : aquaregia is about 1 : 5 weight). 3. Heat the solution, don't exceed 85 degree Celcius. 4. A long heating introduce excess HCL. 5. Heat and evaporated until you got a concentrate like syrup that is Gold Chloride. 6. Gold chloride will become cristall when you cool the syrup. 7. Introduce a little water to disolve the gold chloride. 8. Make amonia solution of 30 ml Amonia in 100 ml water cocentration. (use high grade amonia). 9. Pour the amonia slowly to Gold Chloride until Ph=8. You will get the precipitate that call Gold Fulminating. Be carefull with the Fulminating, It should not to dry because it is Highly Explosive Danger ! 10. Wash the Precipitate to remove excess amonia. Wash several time until PH reach near 7. 11. Make another concentrate Potasium Cyanide solution (KCN). 12. Pour the KCN to Fulminating Gold slowly with agitation until all the fulminating disolve. You Got a solution name Mother Liquor. 13. Heat the Mother Liquor, my experience not over 65 degree celcius. Evaporate amonia from mother liquor until no amonia smell anymore. 14. Cristallize the PGC by continue evaporation. Vacum will be very helpfull. You don't need to evaporate all the mother liquor. Until you evaporate about 75% volume stop the process. Collect the PGC and keep the mother liquor. Dry the PGC by vacum. Mother liquor still can be use in the next production by mixed it with the next Fulminating. 15. Do the all the process in very good ventilation. Good luck.