Core Insights - The key substance in the transformation of gold from ore to jewelry is sodium carbonate, known for its significant role in metallurgy, particularly in gold refining processes [1] Group 1: Role of Sodium Carbonate in Gold Refining - In traditional gold refining, sodium carbonate serves three critical functions, primarily as a powerful flux that lowers the melting point of gold-bearing ore from 1064°C to around 800°C, significantly reducing energy costs [3] - Experimental data from Fujian Zijin Mining indicates that the addition of sodium carbonate can enhance smelting efficiency by over 30%, laying a solid foundation for subsequent processes [3] Group 2: Chemical Reactions and Purity Enhancement - Sodium carbonate's ability to regulate pH is crucial; maintaining a pH level of 10-11 in the slurry maximizes the efficiency of cyanide-gold complex reactions, achieving a gold leaching rate of over 92% with precise control of sodium carbonate dosage [5] - During the electrolysis refining stage, the addition of sodium carbonate allows for selective precipitation of impurities like silver and copper, enabling gold ions to remain in a stable dissolved state, thus achieving a purity level of 99.99% [5] Group 3: Technological Innovations - China National Gold Group has made breakthroughs with sodium carbonate-assisted roasting technology, increasing the dissociation rate of gold-bearing materials to over 95%, making previously unexploitable low-grade gold mines economically viable [7] - The application of this technology in a difficult-to-process gold mine in Yunnan improved resource utilization from 65% to 88%, generating economic benefits exceeding 100 million yuan [7] - Sodium carbonate continues to be an indispensable "magic powder" in gold refining, embodying the wisdom of ancient alchemy and the precision of modern technology [7]