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Shanxi Xincheng 500t/d Gold Ore Project

2017-10-18 XinHai Views (134)

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Xincheng 500t/d gold ore project was designed by Beijing Central Engineering Institute for Non-ferrous Metallurgical Industries in 1977, and put into production in early 1979.

1. Ore property: The ore was middle temperature hydrothermal alteration granite type gold deposit, whose body is deposited in ore-bearing alteration zone of sericitization, chloritization, silicification, pyritization and carbonatization. The main metal minerals included pyrite, a little chalcopyrite, galena, sphalerite and electrum, and gangue minerals were mainly quartz and sericite, followed by chlorite and calcite. The ore property was similar to quartz vein type gold deposit in China, both of them were sulfide-poor gold-bearing deposit, which contained low sulfur and less harmful impurities. Gold disseminated extent is relatively fine, which generally occurred in fissure and intercrystalline of metal sulfides. The inclusion gold was relatively less, gold ore that occurred in the fissure and intercrystalline of pyrite accounted for more than 60%. The grain size of natural gold was generally 0.002 ~ 0.02 mm, and the mineral density was 2.78 t/m3.

2. Process flow: Gold-bearing sulfur concentrate was obtained by flotation process, and its recovery rate was about 95%. After regrinding, cyanide leaching and zinc powder replacement, the gold mud and sulfur concentrate (i.e. leaching residue) were obtained. Then Xinhai sent gold mud to smelt then got alloy gold. The final products were gold ingot and silver ingot. The process flow was shown in figure.

process

Xincheng 500t/d gold ore plant was a relatively complete gold processing plant by summarizing practical experience in mineral processing. Xinhai removed the pipe filter that used in non-ferrous metal wet metallurgy enterprise to liquid purification, which achieved a good result. It was the first time that diatomite successfully applied in gold cyanidation factory as filter aid.

Table 14.11-3 Process Index

NameUnit19841985Notes
Ore Gradeg/t4.034.48Grade of raw ore is different from concentrate grade.
Best respectively sampling.
Concentrate Gradeg/t94.4992.11
Flotation Recovery Rate%95.6795.48
Grade of Raw Oreg/t71.7672.63
Grade of Leach Residueg/t1.651.07
Cyanide Leaching Rate%97.0698.52
Washing Rate%99.5799.66
Replacement Rate%99.7199.86
Cyaniding Rate%96.3698.05
Grade of Barren Solutiong/㎥10.27714.03
Grade of Barren Solutiong/㎥0.03370.029
Grade of Gold Mud%16.3118.64

Table 14.11-4 Unit Consumption Index

TaskFlotation (by raw ore)Cyaniding (by concentrate)
NameWaterElectricitySteel BallLimeXanthate2#OilSodium CyanideZinc PowderLead Acetate
Unit㎥/tkW·h/tkg/tkg/tkg/tkg/tkg/tkg/tkg/t
Quantity2.9833.172.270.80.0880.0445.310.3860.004

Notes: Water, electricity and steel balls are total consumption.

Table 14.11-5 Main Equipment

NoEquipment Name and SpecificationQuantityNotes
1400×600 Jaw Crusher1
2PYZ-1200 Medium Cone Crusher1
3SZZz1500×4000 Vibrating Screen1
4FLG-1200 Single-spiral Classifier1Ore Washing
5TNZ-9 Thickener1Ore Washing
6MQG2100×2200 Wet Grid Ball Mill2
7FLG-1500 Single-spiral Classifier2
8XJK-0.35 Flotation Cell12Used for Slime Flotation
9XJK-1.1 Flotation Cell28
10TNZ-12 Thickener 1Above is Flotation Process
11φ125 Hydrocyclone4Following is Cyaniding Process
12MQY1500×3000 Overflow Ball Mill1
13φ3000×3000 Leaching Agitation Tank6
14φ9000 Three-layer Thickener2
1520㎡ Pipe Filter2
16BAY20/635-25 Press Filter1
1710㎡ Folding Belt Filter2

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