Study on the Gold Recovery from Flotation Tailings of a Refractory Gold Ores in Gansu Province by a Process Combining Mineral Processing and Metallurgy
Received date: 2019-06-06
Revised date: 2019-10-29
Online published: 2020-05-07
There are an abundant gold ores resource in China，and most of gold ores are belong to the refractory ores.The gold in the refractory ores is difficult to recovery by the leaching technology because of the fine dissemination particles in ores.Besides，the natural gold ores usually coexisted with pyrite，arsenopyrite and stibnite and is generally enclosed in these sulfide minerals.The conventional cyanide leaching is difficult to process this gold ore.In this paper，a gold ore from Gansu Province of China contains Au 4.3×10-6，Sb 0.48%，As 0.37% and C 1.84%，which belongs to a refractory gold.The recovery of gold is very low when the ore was directly leached by the cyanide leaching technology.In order to improve the recovery of gold，the gold was recovered in industrial scale by a process combined the gravity separation，froth flotation and cyanide leaching.However，the recovery rate of gold only is 82% due to the gold with a complex dissemination relationship in ores，the gold grade in the final cyanide leaching residue is approximately 0.8×10-6.In order to increase the recovery rate of gold，the occurrence state of gold in flotation tailings was investigated by electron probe microanalysis （EPMA），the flotation tests were conducted in laboratory scale based on the mineralogy results of the flotation tailings.The results indicated that gold in flotation tailings was mainly existed in the formation of lattice gold in arsenopyrite，pyrite and stibnite the or enclosed in these sulfide minerals with the fine dissemination particles size.When the flotation tailings was leached by cyanide solution，the gold enclosed in these sulfide minerals cannot contact effectively with the cyanide solution even if under the very fine grinding fineness.However，the recovery rate of gold was significantly improved when the flotation tailings were firstly sieved before cyanide leaching.After sieving，the coarse particles with the particles size of +0.038 mm was regrinded and increase the liberation degree of pyrite，arsenopyrite and stibnite.After that，the regrinding products was subject to the froth flotation again in order to recovery these sulfide mineral，the tailings after flotation were subjected to the cyanide leaching together with the -0.038 mm fine particles.The recovery rate of gold is obviously increased by 81.3% to 90.21% by using this process，the grade of gold in the final leaching residue is less than 0.3×10-6.The experimental result is helpful for the improvement of industrial production process.
Bo YANG , Xiong TONG , Xian XIE , Xiao WANG . Study on the Gold Recovery from Flotation Tailings of a Refractory Gold Ores in Gansu Province by a Process Combining Mineral Processing and Metallurgy[J]. Gold Science and Technology, 2020 , 28(2) : 285 -292 . DOI: 10.11872/j.issn.1005-2518.2020.02.070
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