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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (1): 113-121.doi: 10.11872/j.issn.1005-2518.2022.01.072

• Mining Technology and Mine Management • Previous Articles     Next Articles

Experimental Study on the Recovery of Fine-grained Tungsten and Tin Mineral by Centrifugal Gravity Separation-Flotation Desulfurization Process

Ting ZHANG1(),Ping LI1,Bo FENG2,Zhenfei LI1   

  1. 1.Ganzhou Nonferrous Metallurgy Research Institute Co. , Ltd. , Ganzhou 341000, Jiangxi, China
    2.Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
  • Received:2021-06-07 Revised:2021-08-16 Online:2022-02-28 Published:2022-04-25

Abstract:

In order to effectively recover the tungsten and tin minerals in a fine mud in Guangxi,a centrifugal gravity separation-flotation desulfurization process test was carried out.The contents of WO3 and Sn in the fine mud are 0.52% and 0.31%,respectively. Among them,tungsten is mainly wolframite and scheelite,accounting for 47.69% and 39.42% respectively;tin mainly exists in the form of cassiterite,accounting for 75.48%,followed by tin in sulfide minerals,accounting for 17.42%.The -0.03 mm grain yield rate in the fine mud is 61.36%,and its WO3 and Sn metal content distribution rates are as high as 78.52% and 70.39%,respectively. Therefore,strengthening the recovery of fine-grained tungsten-tin minerals is the key of improving technical economic indexes of mineral precessing.A comparative test of reclaiming fine-grained tungsten and tin minerals by shaker gravity separation and centrifugal gravity separation was carried out,and it was found that the centrifugal concentrator equipment has superiority in the gravity separation and recovery of tungsten tin fine sludge.Detailed condition optimization experiments were carried out on the parameters of slurry feeding concentration,feeding time and drum speed that affect the separation effect of the centrifugal concentrator,and the appropriate technological conditions for the centrifugal gravity separation to recovery fine-grained tungsten and tin minerals were obtained.Further improve the grade of tungsten tin concentrate through flotation desulfurization test.The study used the combined process of centrifugal gravity separation and flotation desulfurization to carry out the whole process open circuit test,and obtained tungsten-tin concentrate with WO3,Sn grades of 19.46%,9.87%,and the recovery of 67.92% and 57.52%,respectively,realizing the effective recovery of fine-grained tungsten-tin minerals.

Key words: fine-grained tungsten-tin minerals, fine mud, shaker gravity separation process, centrifugal gravity separation-flotation desulfurization process

CLC Number: 

  • TD954

Table 1

Multi-element chemical analysis results of samples"

元素或氧化物含量/%
WO30.52
Sn0.31
S1.55
As0.80
SiO255.83

Table 2

Chemical phase analysis results of tungsten"

钨物相含量/%分布率/%
总钨0.520100.00
黑钨矿0.24847.69
白钨矿0.20539.42
钨华0.06712.88

Table 3

Chemical phase analysis results of tin"

锡物相含量/%分布率/%
总锡0.310100.00
水锡石中锡0.0061.94
硫化物中锡0.05417.42
硅酸盐中锡0.0165.16
锡石0.23475.48

Table 4

Particle size analysis results of fine mud samples"

粒级/mm产率/%品位/%分布率/%
WO3SnWO3Sn
合计100.000.520.33100.00100.00
+0.07414.760.080.092.294.01
-0.074+0.058.510.260.314.297.97
-0.05+0.0315.370.500.3814.9017.63
-0.0361.360.660.3878.5270.39

Fig.1

Test principle flow"

Fig.2

Coarse concentrate index obtained by shaker gravity separation and centrifugal gravity separation process"

Fig.3

Influence of feeding concentration on separation effect of centrifugal concentrator"

Fig.4

Influence of drum rotation speed on separation effect of centrifugal concentrator"

Fig.5

Influence of feeding time on separation effect of centrifugal concentrator"

Fig.6

Influence of flushing water on separating effect"

Fig.7

Test process of flotation desulfurization"

Fig.8

Test results of flotation desulfurization"

Fig.9

Open circuit test process of the whole process"

Fig.5 Open circuit test results of the whole process"

产品名称产率/%品位/%回收率/%
WO3SnWO3Sn
合 计100.000.530.32100.00100.00
硫化矿1.190.590.841.323.13
中矿30.746.193.028.607.00
钨锡精矿1.8619.469.8767.9257.52
中矿24.650.900.807.8511.65
中矿120.280.130.154.959.53
尾 矿71.280.070.059.3611.17
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