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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April 25, 2023