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Guangdong big top iron ore bit Heyuan City Lianping, containing tin, zinc large-scale high-temperature hydrothermal metasomatic skarn type magnetite, an important iron resources in Guangdong Province.
1, material composition
The multi-element analysis of the ore is shown in Table 1, and the mineral composition is shown in Table 2.
Table 1 Multi-element analysis
element | TFe | FeO | Al2O3 | CaO | MgO | SiO2 | Zn | Sn |
content% | 44.8 | 15.54 | 2.00 | 7.56 | 6.25 | 12.5 | 0.17 | 0.12 |
Table 2 Mineral composition
mineral | magnetite | Hematite | Yellow copper ore | Pyrite | Arsenopyrite | Gangue stone | other |
content | 64.37 | 0.64 | 0.05 | 0.02 | 0.05 | 34.23 | 0.64 |
Mineral composition characteristics:
(1). Iron minerals are mainly magnetite, accounting for 97% of the total iron in the original ore.
(2). Magnetite is mainly composed of medium and coarse inlays, of which -40+10mm grain size, magnetite ore monomer dissociation degree is 27-38%, and -10+1mm grain size monomer dissociation degree is 54. -71%, -1+0.2mm particle size monomer dissociation is 83-91%, -0.2mm monomer rate is 96-99%.
(3). Magnetite contains many different forms of impurities, in which spinel platelets and gangues in the form of inclusions have a greater influence on the iron content of magnetite, resulting in iron ore containing iron. Only 67.52%.
(4). 50% of tin is stored in the form of cassiterite, and the others are colloidal tin.
(5) zinc sulfide to zinc metal in the presence of only 6.54%, accounting for 37.38% of zinc oxide, zinc spinel accounted for 50.08%. Therefore, the main valuable minerals in the ore are magnetite, followed by cassiterite.
2, the process
The main point of the process is to use coarse grain pre-disposal, the waste yield is 18.52%, and the iron occupation rate is 3.45%. The ore after the waste is selected by a grinding magnetic separation iron concentrate and two-stage grinding two-stage selection. In the process, the iron concentrate grade is more than 65%, and the iron recovery rate is greater than 94%. Considering the fluctuation of industrial production, the two-stage grinding process is recommended.
3. Test results
Iron concentrate yield: 63.80%; grade: 65.54%; recovery: 94.11%.
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