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The prospects for extracting finely dispersed gold and other useful components from the magnetic tailings of gold recovery plants and other sources are shown. This is achieved by using the process of leaching these particles and their extraction by sorption on metastable nanocrystalline water structures. A gold simulator, a colloid of molecular copper, is passed through the sorbent of a metastable nanocrystalline water structure. After three passes through the sorbent, the copper appears to be completely sorbed. Thus, according to the qualitative analysis of copper sorption, the possibility of extracting gold using this technology is confirmed. [ABSTRACT FROM AUTHOR]

When gold occurs in mining waste for a long time, it becomes coated with dense films of hydroxide of iron, manganese, copper and silver sulfides, hydromica powder and clayey particles, which greatly complicate concentration of such gold by gravity. An efficient method to remove such coatings from gold is treatment of waste using chemical reagents based on halogen-containing compounds. The article presents experimental results on extraction of fine gold from tailings of sluice boxes and dredging classifiers using such chemical reagents. [ABSTRACT FROM AUTHOR]

The technology of gold extraction to lead from its mixture with the sample powder during lowtemperature alkaline fusion is developed. The optimal ratios of masses for the sample, lead, and alkali, as well as heating conditions, temperature, and fusion duration, are determined for satisfactory gold recovery. A low temperature of fusion makes it possible to lighten the structure of furnaces, to decrease energy consumption, and to shorten the duration of the entire cycle from the beginning of fusion until the next set of crucibles is loaded. Using the modular approach, a furnace can be assembled in a small area for the simultaneous fusion of a great number of samples. The results of determining gold by the X-ray fluorescence method obtained by using the proposed concentration technology satisfy the regulatory requirements with respect to accuracy. [ABSTRACT FROM AUTHOR]