Tantou Gold Mine was built in the 1980s and was originally designed with amalgamation + flotation production process. The design capacity is 400t/d. In this century, the amalgamation process is gradually banned, so a single flotation process is used for production. As the ore is depleted, the ore dressing index is decreasing year by year. The original one-run, three-sweeping and three-precision process has only achieved a recovery rate of about 70%. In order to improve the productivity level, the company has commissioned several domestic Well-known research institutes conducted in-depth research on the mine. It is planned to renovate the selected plant based on the research results. Research to obtain process mineralogical data
(1) The principal metal sulfide ore pyrite, other rarely seen sulfide: brass ore, bornite, chalcocite, blue copper, tetrahedrite, arsenopyrite, galena (also see tellurium-lead-silver mining), sphalerite. Limonite has a metal oxide, a titanium ore, magnetite, hematite. The precious metal minerals are mainly natural gold, a small amount of silver and gold ore, Goldschmidt, bismuth gold, bismuth gold and silver, bismuth silver, bismuth silver, bismuth and lead silver. Gangue minerals are quartz, feldspar times, white mica, sericite, chlorite, dolomite small amount (ankerite), calcite, barite and the like.
(2) The size of gold minerals in the ore is mainly fine and fine gold. The gold particles in the interval of 0.037-0.01mm account for 54.37%, the smaller than 0.01mm accounts for 21.62%, and the maximum particle size of gold is 0.09×0.012×0.05mm. Artificial heavy sand is obtained).
(3) The shape and shape of gold minerals are mostly horny, long-horned, sharp-grained, etc., and other forms are less.
(4) In the state of gold minerals, the packaged gold accounted for 71.19%, the intergranular gold accounted for 26.65%, and the gangue microfractures accounted for only 2.16%.
Three sets of experimental data considered to be ideal were obtained for this data.
Test 1: One fine grinding, coarse concentrate regrind test
Test 2: coarse grinding rough selection, coarse concentrate re-grinding test
Test 3: Rough selection of conventional grinding conditions, re-grinding test of medium mine
From the three sets of test data, the first fine grinding condition in the first test is difficult to achieve in production. Although the recovery rate has been greatly improved, the concentrate index has not reached the qualified level, and the concentrate yield has been greatly improved. The cost of sales has increased a lot. Although the grinding requirements in the second test are all within the controllable range of production, the flotation equipment has a certain pressure on the ore-feeding conditions of the granularity, which may easily cause adverse effects such as sinking tanks. In the third experiment, the concentration of medium and large mines is high, the yield is high, the regrind conditions are harsh, the concentration is low, and the fineness of grinding is high, which is difficult to achieve in industrial production.
The company invited Jiangsu Xucheng Mining Technology Co., Ltd. as the transformation unit. Based on the above test results, it was decided to comprehensively consider the test data and test three data conditions for transformation. The transformation requires flexible process and large room for adjustment on site. Under the premise of fully studying the feasibility of production and the layout of the existing site, the transformation unit boldly proposed the idea of ​​using the FCSMC cyclone static microbubble flotation column of China University of Mining and Technology as the main flotation equipment, and designed a short process plan:
Design and transformation process
From the point of view of the process flow chart, the flotation operation is from 8-10 times and compressed to 5 times. The operation of each section is relatively open. The slurry circuit can be adjusted according to the production data at any time, whether it is coarse ore or medium ore. Grind the work again. In the end, the program was approved by the owner and implemented.
Through more than two years of production practice, the company has also adjusted the process according to the production data. At present, the existing process is a two-stage grinding to -0.074mm70%, through a coarse (flotation column) sweep (flotation machine) A fine (flotation column) process, obtaining process indicators close to the test data, greatly reducing power consumption and labor intensity.
Current production process
Of course, the research on the mineral has not yet ended. The difference in the grindability of the ore is that the silicon-coated gold is difficult to dissociate after repeated grinding. Internationally renowned mineral processing expert, Changjiang Scholar, Professor Cao Yijun of China University of Mining and Technology Pre-tailing, reducing the grinding pressure, expanding the processing capacity, and considering the use of microwave technology to help the grinding program. In the end, all these ideas need to be tested to verify, and whether we can help the production in the future, we will wait and see.
Since many investors have contacted me recently, let me give some ideas to the gold mine investment. In future articles, I will intersperse and introduce some mines I have contacted, do some targeted investment evaluation, and hope to invest more. The direction of the business.
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