Study on Improving the Quality of Molybdenum Concentrate in Xiaosigou Copper Mine

Hebei Province, non-ferrous metals company XIAOSIGOU mine since 1980 and converting the production of molybdenum concentrate, molybdenum concentrate beneficiation plant is based on the quality of the Ministry of Metallurgy ministerial YBV60 ~ 65 standard (first grade> 47% molybdenum, two Products > 45% molybdenum) to organize production, such as the quality of molybdenum concentrates from 1980 to 1982 were 47.46%. 48.07%, 47.17%. Compared with the molybdenum concentrate quality of >54% in the international market, the difference is large. Due to the low quality of the produced molybdenum concentrate, the product has poor competitiveness and the price is low. .
According to the data and experience of improving the quality of molybdenum concentrate at domestic and international concentrators, it is determined that the molybdenum-copper separation is carried out before the flotation, and the two-stage re-grinding is used to improve the quality of molybdenum concentrate.
1. Molybdenum-copper mixed concentrate thick drug removal In order to facilitate the separation of flotation of molybdenum and copper to improve the grade of molybdenum coarse concentrate, the mixed concentrate before molybdenum-copper separation flotation is strongly decontaminated. The test results are shown in the following table.

Thick drug release test results

index

Molybdenum-copper mixed concentrate

Separation of coarse concentrate

Separate rough recovery

molybdenum%

molybdenum%

molybdenum%

Not densely removed

4.211

17.6

93.94

Thick drug removal

4.18

19.42

94.06

It can be seen from the above table that the molybdenum-copper mixed concentrate can prevent or reduce the stickiness of the molybdenum-copper separation coarse selection operation after the thick drug removal, and improve the separation and rough selection operation conditions, thereby improving the molybdenum-copper separation coarse and fine mineral production. The molybdenum grade is 1.82%, especially for the molybdenum-copper separation flotation operation.
2. Molybdenum concentrate re-grinding Because the quality of molybdenum concentrate requires 51 to 54% of molybdenum ore to be 85 to 95% of molybdenum ore, which requires molybdenite to dissociate, for which molybdenum concentrate is For regrind, the relationship between regrind and grade is shown in the table below.

Rough concentrate regrind and grade table

Grinding time (minutes)

Regrind -360 mesh (%)

Molybdenum concentrate grade

Copper concentrate grade

Molybdenum concentrate recovery rate (%)

molybdenum(%)

copper(%)

molybdenum(%)

copper(%)

0

47

43.59

0.245

0.141

10.15

82.51

10

68

51.32

0.18

0.129

9.95

81.38

20

86

53.11

0.11

0.141

10.95

81.06

It can be clearly seen from the above table that as the regrind fineness increases, the grade of molybdenum concentrate increases remarkably, and the impurities (copper) of molybdenum concentrate are also reduced, and the fineness of molybdenum concentrate is -360 mesh. 86% is the best, but it is difficult to grind it in a piece of real distance in the field. In order to make the regrind fineness gradually grind, and then add a section of regrind, the molybdenite can reach a relatively complete single. Dissociation, production of fresh molybdenite surface, is conducive to the improvement of the grade of molybdenum concentrate, so a section of regrind fineness is determined to be -360 mesh 68%, re-grind with secondary selected foam, and its two sections are reground The relationship between fineness and concentrate grade and recovery is shown in the table below.

The relationship between the second regrind and the index

Re-grinding time (minutes)

Regrind -360 mesh (%)

Molybdenum concentrate grade

Copper concentrate grade

Molybdenum recovery rate (%)

molybdenum(%)

copper(%)

molybdenum(%)

copper(%)

0

68

51.69

0.18

0.129

9.95

81.38

5

77

53.01

0.105

0.185

10.375

84.62

15

88

53.66

0.105

0.105

10.6

79.09

30

94

53.87

0.095

0.132

10.25

49.52

The index of one-stage and two-stage re-milling small closed-circuit test is: a re-grinding molybdenum concentrate grade of 50.685% Mo, the recovery rate is 96.77%; the two-stage re-grinding molybdenum concentrate grade is 53.395% Mo, and the recovery rate is more than 53%.

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