(A) Jinchangyu Gold ore properties produced from gold sulfide ore deposits. Metallic minerals are mainly pyrite, magnetite, limonite, sphalerite, native gold. It followed hematite, yellow copper ore, molybdenite, small amounts of pyrrhotite, bornite, trace amounts of galena, bismuthinite, chalcocite like. More types of gangue minerals, also more complex, there are more than fifteen kinds of minerals as quartz, carbonate, feldspar, sericite, and chlorite. Pyrite: It is formed in two stages, most of which are formed in the early stage. It is self-crystal form, semi-automorphic form and his grain structure. Its cracks are magnetite, chalcopyrite, sphalerite, limonite, etc. Filling and penetration of edges and other phenomena. Part of the later pyrite is produced in fine veins, running through the chalcopyrite and encapsulating natural gold. Associated minerals are magnetite, chalcopyrite=, hematite, etc. Pyrite is the most mineralized metal mineral, accounting for more than 56.8%. It contains the highest natural gold. Magnetite: mostly in the shape of his veins, irregularly impregnated in the gangue, forming a disseminated structure, hematite distributed in the magnetite, forming a literary structure, the edge of the mineral is hematite Corrosion and other phenomena. Limonite: Limonite is a secondary mineral that is oxidized from pyrite and hematite. The mineral is prolific in the fissures of pyrite and the edge of magnetite. It has an irregular granular structure, and a few particles are pseudo-images of pyrite, which are associated with pyrite and hematite. Molybdenite: It is produced in veins and scales in the fissures of pyrite and gangue, and a small amount is produced in granular form. Natural gold: more than 80% of natural gold is in the form of granules, and about 20% is in the form of flaky fine particles. Natural gold particles are very fine, generally between 5 and 25 microns, with a minimum particle size of 0.5 microns and a maximum particle size of 30 microns, mainly produced in pyrite (about 58%), followed by production in quartz ( About 35%), a small amount distributed in the contact between stibnite, limonite and quartz.
(2) Production process
1. Drug removal: use a ф12 meter thick machine for drug removal, and discharge it with water to adjust the slurry, and then feed it into a ф1200×1200 mm slurry tank.
2. Grinding: The second-stage closed-circuit process is adopted. The first and second stages of grinding are closed by a ф1200×1200 mm ball mill and a ф 125 mm cyclone. Grinding fineness is -350 mesh accounted for more than 99%; ball mill discharge concentration is 60%; cyclone overflow concentration is 28~30%; cyclone feed concentration is 35~45%.
3. Leaching: A two-stage leaching process is used. The cyclone overflow is directly fed into the first leaching ф3500×3500 mm two series leaching tanks. The leaching slurry concentration is 28~30%, the sodium cyanide concentration is between 0.05~0.055%, and the lime is added in the grinding. In the system, the lime concentration is about 0.03%, the inflation pressure is greater than 0.6 kg/cm2, and a 10% sodium cyanide solution is added to the No. 1 and No. 2 leaching tanks, respectively. The second stage leaching also uses two series of ф3500×3500 mm leaching tanks, the sodium cyanide concentration is about 0.045~0.05%, and other operating conditions are the same as the first stage leaching.
4. Washing: The slurry after the first stage of immersion is fed into the first stage of countercurrent washing ф 7.5 m double layer thickener. The concentration of ore is 50%. After adding 30% of the slurry to the slurry, the second stage is leached, and the leaching and discharging is carried out to the second stage of the countercurrent washing ф 7.5 meter concentration machine. The concentration of the ore is 50%. , discharged to the cyanide tailings dam. The washing water (lean liquid) is fed into the lower layer of the second-stage washing double-concentration machine, and the upper layer overflow is fed as washing water to the lower layer of the first-stage washing double-layer thickener, and the upper layer overflowing (precious liquid) enters the zinc powder replacement operation. 5. Displacement: using zinc powder replacement method, after adding lead acetate to the precious liquid, purifying it through a 3.0×1.6×2.0 m purification tank, ф1.0×3.5 m deoxygenation tower deoxidized noble liquid, adding zinc powder, feeding 20 m 2 Displace the filter press and periodically remove the gold mud. The replacement operation controls the concentration of sodium cyanide in the noble liquid to be 0.04 to 0.05%, the concentration of calcium oxide to be 0.03%, and the concentration of lead acetate to be 0.003%. The particle size of zinc powder is -350 mesh greater than 97%, the turbidity of the noble liquid is less than 10 mg / liter, the vacuum degree of the deoxidizing tower is 700 ~ 720 mm Hg column, the gold mud moisture is 37 ~ 38%, and the oxygen content in the noble liquid is 0.1 g / Meter 2. 6. Cyanide-containing wastewater treatment: The poor liquid discharged from the cyanide plant and the cyanide tailing dam overflow into the sewage treatment operation and are treated by the alkali chloride method. Purification process, PH=10, cyanide content after treatment, cyanide content below 5 mg / liter. The consumption of chlorine and lime is not stable.
The process flow of the plant is shown in the figure below.
(III) Technical and economic indicators Cyanide plant economic indicators Technical and economic indicators
| Numbering | Cyanide ore contains gold g / ton | Cyanide tailings containing gold (g / ton) | Cyanide residue containing gold (g / ton) | Premium liquid containing gold (g / ton) | Lean liquid containing gold (g / ton) | Leaching rate (%) | Washing rate (%) | Replacement rate (%) | Total cyanide recovery rate (%) |
| 1 2 | 137.419 117.45 | 3.86 3.63 | 3.54 3.37 | 17.869 9.986 | 0.016 0.012 | 97.3286 97.075 | 99.789 99.78 | 99.908 99.87 | 97.0 96.73 |
Jinchangyu gold mine cyanide plant economic indicators
| Iron ball (kg/ton) | Sodium cyanide (kg/ton) | Zinc powder (kg/ton) | Lead acetate (kg/ton) | Chlorine gas (kg/ton) | Coagulant (kg/ton) | Lime (kg/ton) | Total cyanide recovery rate (%) | ||
| Leaching | Purification | Total consumption | |||||||
| 8.65 | 6.513 | 0.601 | 0.18 | 2.647 | -- | 19.76 | 57.6 | 77.36 | 84.4 |
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