The Research And Application Of High-efficiency Recycling Of Gold From WoXi Concentrator

With the improve of mineral processing technology,concentrators consider more about the efficient recovery of valuable metals,and even about the technical and economic of mineral processing technology.Due to the lack of domestic gold ore resources and the large import of foreign gold mines,how to make best use of domestic limited mine resources has become an urgent problem for gold mining concentrators.In view of the plan of "promoting the comprehensive conservation and efficient utilization of mineral resources" proposed by Hunan Gold Group Co.,Ltd.Taking the raw ore of Woxi concentrator of Hunan Gold Group Co.,Ltd.as the research object.Based on the study of raw ore and the tailings of tungsten flotation,a variety of technical schemes have been tested and studied in view of the state of gold bearing substances in raw ore and the tailings of tungsten flotation.The characteristics of gold loss in the production of the tailings of tungsten flotation were analyzed,and a technical scheme for high-efficiency recovery of gold ore from the he tailings of tungsten flotation was provided.Combined with the production practice,the old production lines were renovated and successfully applied in industrial production.The following conclusions were made1.The gold in the raw ore mainly existed as the natural gold,the antimony mineral mainly existed as stibnite,the tungsten mineral mainly existed as scheelite,a small amount of wolframite,and other sulfides mainly existed as pyrite;Gangue minerals existed as quartz and mica.2.Gold mainly associated with pyrite,quartz,stibnite,siderite,arsenopyrite and sphalerite in the form of fine-grained interstitial fissure gold.The properties of gold with pyrite,quartz and stibnite should be considered in the recovery of gold.3.The grade of gold in the wolfram flotation tailings is as high as0.74g/t,and the particle size distribution of gold ore above +0.01 mm accounts for 75.92%,and +0.074 mm accounts for 40.25%.The insufficient monomer dissociation of gold in the wolfram flotation tailings is the main reason for the high grade of tailings.4.The tungsten flotation tailings can’t be concentrated by magnetic separation,high-speed centrifuge and all slime cyanidation leaching.Regrinding and floatation of tailings can realize efficient recovery of gold.5.The old renovation was carried out in Woxi concentrator.The final grade of tailings is 0.41g/t,and the total recovery of gold concentrate is91.63 %,an increase of 3.63 % compared with that of 88% before the renovation.The tailings gold collection system can recover about 62.6 kg of gold according to the annual production of 330 days.