Study on Technological Mineralogy Properties of Altered Rock-type Gold Ore from Jiaodong

Chemical analysis method, Refection Polarizing Microscope (PMR-POL), X-ray Diffraction (XRD), analysis type Scanning Electron Microscope (SEM), and Electron Microprobe Analysis (EMPA) to study the technological mineralogy and sorting properties of gold ore in Jiaodong altered rock-type has been comprehensively applied. The results show that the technological type of this ore belongs to low sulfide and gold-bearing pyrite. 66.7% of the gold occurred in the natural form, with electrum making up the remaining 33.33%. The average purity of gold in this ore was 720.44, natural gold was 829.72, and electrum was 784.77. Pyrite was the major carrier of gold. The gold was primarily of fine or ulter-fine particles in the range of 5-37 μm. The accumulation volume in this range of sizes was 99.83%. Gold in this ore is easy to liberate. Under the condition of about 55%-65% with coarse grinding less than 75μm, the disaggregation rate of gold in natural form and sulfide inclusion forms can reach about 94% and obtain a good flotation index in the process of flotation.