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Chiweigou Gold Mine
(1) Ore properties
The ore deposit has an elevation of 266-620 meters, which belongs to the low mountain area of ​​the eroded structure. Gold ore occurs in quartz calcite veins, wall rock is mainly andesite lava angle, are relatively stable, but the development of the fault along the veins of ore body has some destructive orebody footwall alteration zone is to increase the deposit One of the main factors in the exploitation of the depletion rate.
The main metallic ore minerals are gold silver, argentite, pyrite; as brass ore, sphalerite, galena, hard manganese ore, limonite.
The main gangue minerals are quartz, calcite; followed alunite, ice feldspar, sericite, and chlorite.
Silver gold ore: grayish white, he shaped particles, flakes or fine aggregates, particle size 0.01~0.03 mm, distributed in the gap of quartz particles with sparse dyeing.
Gold: It is in the state of natural gold and sulfide, and it is found in silver gold, natural gold, and needle sulfur gold ore. The pyrite contains trace gold, mainly silver and gold.
Silver: Natural elements and sulfides are found in silver and gold mines. Natural silver and silver mines are generally 2 to 10 g/t and high at 46 g/t.
The ore is dominated by sparsely dip-dyed structures. Silver gold ore, fluorite ore, pyrite and other metal sulfides are sparsely disseminated in fine particles and distributed in the interstitial space of gangue mineral particles. Calcite veins are also common, calcite quartz veins, quartz veins are breccia-like, massive structure. The ore structure type is mainly his semi-automorphic crystal, granular inlaid structure and metamorphic ore structure.
(2) Production process
The plant adopts full mud cyanidation, one-stage immersion, countercurrent washing and zinc wire replacement process
1. Crushed mine. The two-stage closed-circuit crushing process is adopted, and the maximum grain size of the ore is less than 300 mm, and the 300×320 mm sieve is placed on the top of the original mine. The ore is fed into a 400×600 mm jaw crusher by a 980×1240 mm tank type feeder . The coarsely crushed and finely divided ore is sent to a 900×1800 mm vibrating screen by a belt conveyor. The screened product is returned to the ф900 mm medium cone crusher by a belt conveyor, and the product is sent to the powder bin. The size of the crushed ore product is 12~0 mm.
2. Grinding. Adopt a two-stage full closed circuit process. The first section consists of a MQY1500×3000 mm overflow ball mill and a FLC-1200 mm submerged single spiral classifier. The grinding fineness is 75%-200 mesh, and the original ore volume is 3.5 tons/hour. The utilization factor is 0.465 tons/ When the meter is 3, the sand returning ratio of the classifier is about 96%. The second section of the grinding design is a closed circuit of the ф1200×2400 mm ball mill and the ф200 mm cyclone, but the cyclone is used instead of the cyclone in the production. , grinding fineness 85~90%-200 mesh. The overflow concentration of the dredging bucket is about 24%.
3. Leaching. Use full mud cyanidation, a leaching process. The lean liquid is returned to the grinding system and is leached by adding sodium cyanide to the ball mill. The leaching rate of the grinding is about 50%. The overflow of the second-stage grinding mud bucket was sent to five ф3500×3500 mm mechanical stirring tanks for leaching, the leaching concentration was about 24%, the cyanidation concentration was 0.037-0.042%, the PH value was 10~11, and the leaching rate was 87-93%.
4. Wash. A four-stage thickener is used for countercurrent washing. After the leaching, the slurry is first washed by a Ñ„9000 mm single-layer thickener, and the overflow is the replacement of the noble liquid. The discharge pump is lifted to a Ñ„9000 mm three-layer thickener for three-stage countercurrent washing. In order to accelerate the sedimentation of the slime, it is necessary to add 3# neutral coagulant at 100 g/ton, so that the discharge concentration of the single-layer thickener is 30%. Increased to 52%, while the three-layer thickener index has also been improved, the concentration of ore removal increased from 30% to 48%, so that the washing efficiency has been significantly improved.
5. Replacement. The zinc wire replacement method is used, and the lean liquid is clarified. After the sand filter, the gold cabinet is sent for replacement. The volume of the precious and lean tanks is 115 m 3 and the consumption of zinc is 0.62 kg / ton.
6. Melting. The gold mud of the replacement operation is pickled, washed, dried, batched, and kneaded in a 37 kW box furnace. The slag feeding and recovery system is crushed by a jaw crusher, crushed by a self-made ф900×900 mm ball mill, and the gold is recovered by a shaker and returned to the smelting. The crude gold after refining is remelted and water quenched, dissolved in silver with nitric acid, dissolved in a copper plate to replace the sponge silver, and then melt-cast to obtain a silver ingot with a purity of 98% or more. The slag after silver nitrate removal is washed and dried, and refined in a 37 kW box type electric furnace. The refining temperature is 1300 ° C, and the gold content of the combined gold is 60-80%. Slag delivery system.
7. Sewage treatment. A chlorine extraction chamber and a lime milk preparation chamber are provided between the treatments by alkali chlorination. The underflow of the three-layer thickener is discharged near the second-stage sand pumping station, and the first sewage treatment room is provided with a chlorine-adding chamber and a lime milk preparation chamber. The underflow of the three-layer thickener is discharged into the pumping tank, and the prepared lime milk is added at the same time. The liquid chlorine is fed into the suction pump of the sand pump through the chlorinator, stirred by the sand pump, and cyanate is generated during the transportation, and is sent to In the agitation tank of the second sewage treatment room, mixing and stirring were continued, and the designed stirring time was 1 hour. In addition, there is a chlorination machine and a universal ion meter to measure the water quality in time. If it is found to be unqualified, the agitation tank can be used in series. After the chlorination is continued, it is discharged into the sand pump pool and sent to the tailings by the pump. Library. In actual production, the standby chlorination point of the second sewage treatment room has not been used, and the chlorination has reached the discharge standard. The sewage treatment cost of the plant is about 0.4 yuan / m 2 . The sewage treatment results are shown in the table below.
Chiweigou gold mine sewage treatment results
Tailings water
Discharge water
Tailings dam water
Material consumption
CN - (mg/L)
PH
CoCl 2 (mg/L)
CN - (mg/L)
PH
CN-(mg/L)
PH
Liquid chlorine (kg/ton)
Lime (kg/ton)
116~176
9
64~150
0.04~0.08
7~10.5
0.04
6
1.38
2.6
(3) Technical and economic indicators
The technical indicators of the Chiweigou gold mine are shown in the table below, and the economic indicators are shown in the table below.
Technical Index of Chiweigou Gold Mine Cyanide Plant
Numbering
Processing capacity (ton / day is)
Original gold grade (g / ton)
Cyanide slag gold grade (g / m 2 )
Gold grade of precious liquid (g / m 2 )
Lean liquid gold grade (g / m 2 )
Leaching rate (%)
Washing rate (%)
Replacement rate (%)
Total cyanide recovery rate (%)
1
2
3
107
87
84.4
6.27
5.26
3.84
0.43
0.48
0.31
2.22
1.81
1.65
0.05
0.05
0.04
93.1
90.8
91.9
98.07
97.47
97.26
97.7
97.2
96.2
91.3
88.5
88.6
Economic indicators of cyanide plant in Chiweigou Gold Mine
Steel ball (kg/ton)
White ash (kg/ton)
Zinc wire (kg/ton)
Chlorine gas (kg/ton)
Sodium cyanide (kg/ton)
Power consumption (degrees / ton)
Water consumption (m 2 / ton)
Sewage cost (m 2 / ton)
Cyanide cost (yuan / ton)
2.2
6.5
0.67
1.38
1.6
79
6.3
0.40
23.82