The coarse concentrate of Luanchuan molybdenum ore was regrind (time change), and 10 g/ton NaCN was used as a non-molybdenum sulfide impurity inhibitor in the five open selections of the same conditions. The test results, fineness, brass floating ore may influence of molybdenite respectively below two FIG. It is not difficult to see from the figure that grinding 8 points (fineness 90% - 36μ) is the best sorting fineness of molybdenum and copper. 1. Decontamination, dehydration and enhanced regrind of coarse concentrates The selection efficiency of Yangjiazhangzi Mining Bureau is low, mainly because there are too many excess oils in coarse concentrates, coarse concentrates are not ground, molybdenum ore and others The gangue minerals are not well separated. To this end, there have been many technical and economic comparisons of the program, and finally it is considered that the scheme of dehydration and degreasing of coarse concentrates and strengthening the regrind is the most effective. The test results show that the yield of three selected concentrates is reduced by 5.71% to 6.00%, the grade of molybdenum concentrate is increased by 1.95 to 5.34%, and the recovery rate of molybdenum is increased by 0.8 to 0.02%. The results of the regrind test of coarse concentrate are shown in the table below. Rough concentrate regrind test results Numbering Grinding fineness %-200 mesh Concentrate yield % Concentrate grade % Tailings grade % Recovery rate % Mo Fe Mo Fe Mo Fe 1 91.26 41.48 12.32 10.75 0.212 17.8 97.63 29.98 2 92.57 44.25 11.69 14.07 0.125 16.84 98.67 39.87 3 93.46 44.83 11.42 16.28 0.14 14.8 98.51 47.2 4 96.33 43 11.84 14.67 0.16 16.79 98.24 39.73 5 96.53 43.47 11.74 14.89 0.137 15.71 98.51 42.16 From the indicators in the above table, when the grinding fineness is 92.57%-200 mesh, the selection index is the best, so the grinding fineness is more suitable. The first set of closed-circuit process test selection indicators Numbering Process name Concentrate yield % Concentrate grade % Tailings grade % Recovery rate % Mo Fe Mo Fe Mo Fe twenty four Roughing and removing medicine and grinding 46.18 17.85 24.55 0.253 18.31 98.38 53.5 25 Rough grinding (blank) 52.18 12.51 26.02 0.228 13.05 98.36 68.51 　 Difference -6 5.34 -1.47 0.025 5.26 0.02 -15.01 The second set of closed-circuit process test selection indicators Numbering Process name Concentrate yield % Concentrate grade % Tailings grade % Recovery rate % Mo Fe Mo Fe Mo Fe 26 Roughing and removing medicine and grinding 42.21 13.68 23.9 0.18 16.83 98.23 50.91 27 Rough grinding (blank) 49.66 11.73 29.42 0.319 6.95 99.35 80.87 　 Difference -5.71 1.95 -5.52 -0.139 9.88 0.88 -29.96 3. Putting coarse grinding fineness, increasing production and energy saving In the national molybdenum research conference in 1992, Changsha Nonferrous Metallurgy Design and Research Institute introduced the idea of ​​rough grinding after introducing re-election and recovery of white tungsten . At the beginning of 1992, the Luanchuan Molybdenum Mine and the Zhengzhou Light Research Institute conducted a small-scale test and industrial test on the San Daozhuang ore. The test proves that the original design grinding fineness is 70%-200 mesh, and the coarsening is 50%-200 mesh, which is technically feasible. It not only does not affect the selection effect of molybdenum, but also facilitates the re-election recovery of associated white. Comprehensive recovery of tungsten. At the same time, it has great economic significance in terms of energy saving and production increase. 1. Whole Assembled Shipment . No need On-Site Installation and commission ! Intelligent Machine,Intelligent 3D Machine, Intelligent Bending Machine,Intelligent Punching Machine,Intelligent Shearing Machine JINAN EURO-ASIA MACHINERY CO., LTD , https://www.eaelectricmachine.com
Beijing Research Institute of Mining and Metallurgy and the relationship between the size of three silicon molybdenum concentrate Jinduicheng molybdenum mine, said: grinding and then just right is the key to improving the quality of molybdenum.
The Jinduicheng molybdenum mine is the most typical deposit of fine veins, and the mineral inlay size is not uniform. The presence of molybdenite and gangue is the key to making concentrates high in silicon. As shown in the two figures below, the coarser the coarse grade concentrate, the higher the silicon content and the lower the molybdenum grade. Therefore, in order to improve the concentrate grade, the necessary regrind fineness must be met. [next]
After performing the grinding fineness testing, and determine the water glass, coal oil, No. 2 oil is the optimum amount conditions, and then a comprehensive open test.
It is seen from the results of the comprehensive conditional open-circuit process test that the de-watering and re-grinding process obtains a good selection index, and the molybdenum concentrate grade is increased by 2.25% Mo, and the recovery rate is slightly improved. The concentrate yield decreased by 11.51%, indicating that the on-site overflow sample was not deoiled, and the ore circulation was large, and the useful mineral molybdenite was less selective. Therefore, it is necessary to conduct a closed-circuit process comparison test.
The process flow of the closed-circuit process test was three times of two selective sweeps with a flotation time of 31 minutes. The first closed-circuit process test required a similar recovery rate to see how much the molybdenum concentrate grade was increased. The second closed-circuit process test required similar grades of molybdenum concentrates to see how much the selected recovery rate increased. From the test results, the first set of test results showed that the concentrate yield was reduced by 6%, the molybdenum concentrate grade was increased by 5.34% Mo, and the selected recovery rate was slightly improved; the second set of closed-circuit test results showed that the concentrate yield was reduced by 5.71%. The grade of the mine is increased by 1.95% and the selected recovery rate is 0.88% (see the next two tables.)
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According to the above situation, the molybdenum ore was put into the production practice (industrial experiment) in the second half of 1982. According to the current production data, the grinding grain size is reduced from 62.35% to 200 mesh to 55.76%-200 mesh, the production capacity is increased by about 20%, and the unit cost of 300 tons/day molybdenum concentrate can be reduced by about 5%. .
The ore properties of the mine can be summarized as follows:
Metallic minerals: molybdenite, scheelite, pyrite, chalcopyrite, pyrrhotite and the like.
Gangue minerals: garnet, diopside, quartz, plagioclase, mediator side, wollastonite and the like.
Embedding characteristics of major minerals:
Molybdenum ore: a sheet-like single crystal or aggregate embedded in the gangue, only 2% of which is a fine phosphorous single crystal embedded in the gangue or in the scheelite, molybdenum and yellow iron The relationship between the ore is not very close. The molybdenum ore has a particle size of 1 to 1000 microns, generally 20 to 400 microns, and an average of 64 microns. According to statistics, +70 microns accounted for 70.4%, and -10 microns accounted for only 1.8%. The diabase skarn-type molybdenum ore in the Sandaozhuang mining area is the coarsest, and the monomer dissociation is good.
Trebium ore: flaky single crystal or aggregate impregnated with inlaid gangue, scheelite and pyrite are rarely symbiotic, but scheelite is closely related to molybdenum ore, and is replaced by scheelite. The crystal has a particle size of 1 to 30 micrometers, and there is also about 2% of the same type of molybdenum in the scheelite.
In view of the above-mentioned ore properties, in addition to the Luanchuan Molybdenum Mine, the small tests conducted by the Zhengzhou Light Metal Research Institute, the Beijing Research Institute of Mining and Metallurgy and the Laboratory of the Henan Provincial Geological Bureau have consistently proved that the fineness of the ore grinding can be reduced to 50%. -200 mesh, the finest is no more than 55% -200 mesh.
The Luanchuan Molybdenum Mine began the rough grinding process in production in September 1982. The measures include reducing the overflow of the classifier by 50 to 60 mm, increasing the agitation speed of the roughing machine, increasing the amount of kerosene and increasing the dosage point, increasing the regrind operation of the mine, and improving the ratio of the ball to the ball and the amount of the ball. The implementation results, on the basis of maintaining the original level of mineral processing indicators, have obtained significant economic benefits;
(1) Improve the processing capacity of the concentrator before roughing (grinding fineness: 65%~70%-200 mesh) The processing capacity of the beneficiation is 250 tons/day, and the processing capacity is reduced to 50-55%-200 mesh. It can reach 300-320 tons/day.
(2) Reducing power consumption After the coarse grinding process was adopted in the Luanchuan molybdenum mine, the amount of ore treated was significantly increased and the power consumption per unit of ore was significantly reduced under the same amount of electricity.
Take August 82 and January 83 as examples: the unit power consumption before rough grinding is 34.43 degrees / ton, and the total amount of the concentrator is 191,400 degrees. After rough grinding, the unit power consumption dropped to 28.5 degrees / ton. It can save 33,000 kWh of electricity every month and save 396,000 kWh of electricity throughout the year.
(3) Reducing steel consumption Since the time for the coarse grinding process ore to stay in the mill is shortened, the consumption of the liner and the steel ball is greatly reduced.
According to the assessment in the past six months, the consumption of per unit ore before rough grinding is 1.5kg/ton, and after rough grinding, it is reduced to 1.3~1.4kg/ton. That is, 2295kg of steel balls can be saved every month, and 27548kg can be saved in the whole year (taking the material consumption in the 83rd month as an example).
The service life of the lining is prolonged. The lining of the ball mill before rough grinding is generally four sets per year, and after rough grinding, each lining can be extended by 15 days to 30 days. Not only saves steel, but also reduces parking time and ensures equipment operation rate.
(4) Reduce the cost of the beneficiation unit and increase the economic benefit of the enterprise. After the coarse grinding fineness, the unit cost of the ore processing and the tonnage cost of the concentrate are significantly reduced. According to the actual production data of the 300 ton/day plant, a 1.5×1.5 m and a 1.5×3.0 m lattice ball mill can process 1.68-20.1 million tons of ore per year, and can produce 73 tons of molybdenum concentrate. The output value increased by 1.142 million yuan, and the profit was 493,100 yuan. Due to the improvement of quality, the cost is also greatly reduced, the cost per ton of concentrate is reduced by about 5%, and the annual profit can be increased by 668,000 yuan.
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