Automatic Process Mineralogy Based on Gold Ore Core

Abstract

This is an article in the field of process mineralogy. A quartz vein type gold deposit in Shandong has a gold grade of 2.51 g/t. In order to further develop the deposit and study the beneficiation process, the process mineralogy of the mineral was carried out. The technical methods involved in this study include multi-element chemical analysis, chemical phase analysis, optical microscope identification, X-ray diffraction (XRD) analysis, automatic quantitative mineral analysis (BPMA), scanning electron microscope energy spectrometer (SEM-EDS) analysis, etc. The results show that: (1) most of the gold minerals in the ore are silver-gold, and a small amounts of gold, silver and natural gold are occasionally found; (2) The embedding relationship between gold minerals and sulfides such as pyrite in the ore is very close. Pyrite is the main carrier mineral of gold minerals, and the proportion of single and exposed gold in the ore is high, which is 58.96%. The proportion of gold encapsulated in sulfides such as pyrite is 39.84%, and the proportion of gold encapsulated in gangue minerals is 1.20%; (3) The particle size distribution of gold minerals in the ore is uneven, and the overall particle size is relatively fine. Gold particles with a particle size larger than 0.020 mm can be seen in the ore, with an occupancy rate of 22.08%. Gold minerals with a particle size less than 0.020 mm have an occupancy rate of 77.92%, with an occupancy rate of 24.83% for micro gold minerals with a particle size less than 0.005 mm and 0.35% for sub micron sized gold minerals with a particle size less than 0.001 mm.

Keywords

• core gold
• pyrite
• silver gold deposit
• process mineralogy
• distribution characteristics
• occurrence state