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Figure 1 Fluorite flotation principle process
Fig 1 Flotation flowsheet of fluorite
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THE INVESTIGATION OF FLOTATION DEPRESSANTS ON COMPREHENSIVERECOVERY FLUORITE FROM SHIGHUYUAN
Study on Comprehensive Recovery of Flotation Inhibitors in Shizhuyuan Fluorite
Quoted from: Ye Zhiping, He Guowei (1. South China Normal University, Guangzhou 510006; 2. Guangzhou University, Guangzhou 510006)
CLC number: TD923.14; TD971.5 Document code: A Article ID: 1671-9492 (2005) 06-0044-03
Shizhuyuan metal rich fluorite ore associated resources, the country's total reserves of fluorite associated fluorite reserves 74%, about 5% of fluorite reserves. While the recycling of tungsten, molybdenum and niobium minerals, Shizhuyuan Nonferrous Metals Co., Ltd. has been striving to improve the comprehensive utilization of resources, improve the economic benefits of enterprises, and enthusiasm for the recovery of fluorite.
In the process of mining polymetallic ore, Shizhuyuan produces about 140,000 tons of fluorite metal per year. Among the mineral resources, the proportion of the total value of fluorite accounts for a considerable amount. With the continuous development of the company and the gradual increase in the daily processing scale, the absolute amount of fluorite discharged every day with the floating tungsten tailings is also increasing. Due to the non-renewability of resources and the recovery of the global economy, the demand for fluorite in domestic and foreign markets has increased continuously in recent years, and prices have risen. This has laid a good foundation for the development of fluorite for the persimmon garden.
For Shizhuyuan nature of the ore fluorite ore through a lot of testing studies to determine the new inhibitor NO3, NO3 Shizhuyuan for flotation of fluorite ore characteristics and process characteristics, not only has good floating in mineral slurry The selective inhibition ability, and has a good dispersion.
1 ore nature
The flotation ore sample was taken from the non-magnetic product of the Shizhuyuan tungsten tailings after strong magnetic separation. The feedstock contained CaF 2 26.55%, SiO 2 41.76%, and CaCO 3 4.28%. Fluorite was the main target mineral for separation. The gangue minerals are mainly quartz , feldspar and calcite , as well as epidote, chlorite, mica and tremolite .
The results of the screening analysis of the flotation feedstock are shown in Table 1. It can be seen from Table 1 that the fluorite is mainly concentrated in the -39 μm particle size range, the yield is 53.47%, and the occupancy rate is 61.95%. In the +39 μm particle size, the coarser the particle size, the lower the CaF 2 content, mainly due to the relative enrichment of the gangue-containing minerals in the coarse fraction and the increase in the fluorite.
Table 1 Screening analysis results of flotation feedstock (%)
Tab 1 Sizing analyzing results of flotation material (%)
Size/μm
Yield
CaF 2 content
Occupancy rate
+74
-74+39
-39
Feeding
14.51
32.O2
53.47
100.0
16.08
24.81
31.29
27.O1
8.64
29.41
61.95
100.00
2 Fluorite flotation principle process and results
The fluorite flotation process is a rough selection, seven selections, rough selection and one or two selections to discard the tailings, returning from the third to seventh selection order, and adding fluorite and other adjusting agents such as water glass. Modified oleic acid was used as a collector, and fluorite was selected to add NO3 inhibitor. The fluorite flotation principle process and results are shown in Figure 1 and Table 2, respectively.
Table 2 Fluorite flotation results (% )
Tab 2 Results of fluorite flotation (%)
product name
Yield
CaF 2 content
SiO 2 content
CaCO 3 content
CaF 2 recovery
Rough selection of tailings
Fine 1 tailings
Fine 2 tailings
Fluorite concentrate
Flotation feed
60.18
10.29
9.79
19.74
100.0
0.89
26.29
41.72
97.39
26.55
1.06
41.76
0.68
2.O2
10.19
15.38
72.41
100.0
3 Discussion
3.1 Water glass inhibition effect
Water glass is an effective inhibitor of silicate gangue minerals and has a good dispersion effect on slime. It is a commonly used inhibitor of fluorite flotation. In the selection of fluorite in Shizhuyuan, the inhibition effect of water glass was explored. The test results were judged by η=ε-r, η-selection efficiency; ε-fluorite recovery rate; r-fluorite flotation Mine yield%.
The relationship between the amount of water glass and the efficiency of fluorite flotation is shown in Figure 2. It can be seen from Fig. 2 that the addition of water glass is more efficient than the flotation without addition, but even at the highest point of the curve, the flotation efficiency is only 20.2%. Fluorite flotation only adds water glass, and the flotation effect is poor. When the amount of water glass added exceeds 100 mg/L, the flotation efficiency drops sharply. When the dosage reaches 200 mg/L, the beneficiation efficiency is close to zero. The more the water glass is used, the lower the flotation efficiency, which is related to the large alkalinity of the water glass, the increase of the pH of the flotation solution, and the agglomeration of the fluorite in the alkaline pulp.
Figure 2 Relationship between water glass dosage and fluorite flotation efficiency
Fig 2 Relationship between the dosage of Na 2 SiO 3 and fluorite flotation efficiency
3.2 Effect of combined inhibitor NO3
NO3 is a combination inhibitor consisting of three components, water glass, O1 and O2, respectively, and the combination ratio is determined by experiments. The O1 and O2 agents have an inhibitory effect on the silicon-containing minerals in the slurry, and have a dispersion effect on the slurry adjustment and the fine particles. Figure 3 shows the inhibitory effect of O1, O2 and the combined inhibitor NO3 on fluorite flotation. It can be seen from Fig. 3 that the O1 and O2 agents are effective for the selection of fluorite. The O1 is in the range of 80-100 mg/L, and the flotation efficiency exceeds 35%. However, as the dosage increases, the flotation efficiency decreases slowly. O2 has good adaptability. In the wide range of 100-200mg/L, the flotation efficiency exceeds 34%. When the dosage is 160mg/L, the flotation efficiency reaches 38.4%. When the three inhibitors are used in combination, they show a good positive synergistic effect. NO3 has a higher effect than any single inhibitor, and maintains high sorting efficiency over a wide range of dosages. Dispersion of pulp and selective inhibition of silicon-containing materials.
Figure 3 The effect of NO3, O1, O2 inhibitors
Fig 3 Depression effect of NO3,O1and O2
1-O1; 2-O2; 3-NO3
3.3 Comparison of the effects of NO3 and other acidic water glass combination inhibitors
NL and NS are acidic water glass combination inhibitors, NL consists of water glass, aluminum sulfate, sulfuric acid and CMC. NS is prepared from water glass, sodium sulfate and sulfuric acid in a certain proportion. The effects of three inhibitors of NO3, NL and NS See Table 3 for comparison. It can be seen from Table 3 that the fluorite flotation uses a NO3 combination inhibitor, which has high separation efficiency, can not only ensure a certain quality, but also can obtain a high recovery rate of fluorite.
Table 3 Comparison of effects of three inhibitors (%)
Tab 3 Results comparison of three depressants (%)
product
Yield
CaF 2 content
Recovery rate
Combination inhibitor
Fluorite concentrate
Middle mine 1-4
Flotation tailings
Feed mine
7.65
38.62
53.73
100.0
95.86
46.73
1.73
26.31
27.87
68.59
3.54
100.0
NL
Fluorite concentrate
Middle mine 1-4
Flotation tailings
Feed mine
12.60
32.90
54.50
100.0
94.52
44.10
0.94
26.93
44.22
53.88
1.90
100.0
NS
Fluorite concentrate
Middle mine 1-4
Flotation tailings
Feed mine
22.25
26.50
51.25
100.0
93.95
23.34
1.41
27.81
75.1
22.2
2.60
100.
NO 3
3.4 Quality analysis of fluorite flotation concentrate
The use of flotation method to select fluorite is a relatively mature method. However, the recovery of fluorite from polymetallic ore is due to the complex nature of ore and the variety of minerals, which must be obtained from feedstocks containing less CaF 2 . The acid grade fluorite concentrate makes SiO 2 less than 1%, and the purification of fluorite is difficult. With the NO3 combination inhibitor, high separation precision has been obtained. For the strongly magnetically selected non-magnetic product containing 26.55% of CaF 2 , the obtained fluorite flotation concentrate contains CaF 2 97.39%, SiO 2 1.06%, CaCO 3 0.68. %. The indicators indicate that the CaF 2 and CaCO 3 content of the fluorite concentrate has exceeded the quality requirements of the secondary fluorite concentrate, but the SiO 2 content failed to meet the standard. To this end, the mineral composition and monomer dissociation degree of fluorite concentrate were determined. The analysis result is that fluorite content accounts for 98.5%, and amphibole, epidote, chlorite, Fushan stone, mica and other silicon The acid salt mineral is 1%, the carbonate mineral is 0.5%, and the fluorite monomer has a degree of dissociation of 97%. The results show that there are two ways to reduce the SiO 2 content of fluorite concentrate. One is to improve the process to improve the sorting accuracy, and the other is to increase the grinding to improve the monomer dissociation degree of fluorite.
4 Conclusion
1. A new combined inhibitor NO3 developed. It is suitable for the ore nature of Shizhuyuan polymetallic ore and adapts to the process characteristics of fluorite flotation. The bacteriochemical flotation of Shizhuyuan fluorite uses the developed NO3 combination inhibitor to obtain good separation index.
2. Using the performance complementarity and synergistic effect of the inhibitor, the NO3 combination inhibitor not only has good dispersion effect on slurry adjustment and fine particles, but also has enhanced inhibition ability.
3. Reducing the SiO 2 content of the Shizhuyuan fluorite concentrate can be achieved by improving the process, improving the sorting precision and increasing the grinding degree.
references
[1] Sun Chuanqi, Yin Wanzhong, Principle of silicate mineral flotation [M]. Beijing: Science Press, 2001, 287-290.
[2] Zhu Yushuang, Zhu Jianguang. The chemical principle of flotation reagents [M]. Changsha: Central South University of Technology Press, 1996, 324-325.
[3] Zhang Wei. Combination use of flotation reagents [M]. Beijing: Metallurgical Industry Press, 1994, 164-172.
[4]YE Zhiping, HE Guowei. New Technology for Comprehensive Recovery of Fluorite from Shizhuyuan Floating Tungsten Tailings [J], Nonferrous Metals, 2005, 57(3): 70-72.
[5]æž—æ—¥å.Study on flotation of polymetallic ore fluorite in Shizhuyuan by GF combination agent[J].Journal of Guangdong Nonferrous Metals,2001,50(1):9-12.
YE Zhiping',HE Guowei 2
(1.South China Normal University, Guangzhou, 510006, China; 2.Guangzhou University,Guangzhou 510006, China)
ABSTRACT
The new type of depressant combination developed has been applied in flotation test for recovery fluorite from Shizhuyuan multi-metal mine. The flotation concentrate of fluorite obtained a grade of CaF 2 97.39 % , SiO 2 1.06 % , CaCO 3 0.68%, recovery 72.41% To the feed of CaF 2 26.55%. The comparison results and effect of NO3 , the depressant combination, in the process of fluorite flotation have been discussed and shown in the paper.
KEY WORDS: fluorite; flotation; depressant combination