Experimental Study on the Step Selection Process of Medium and Low Grade Phosphate Ore in Guizhou Zhijin

I. Introduction

Zhijin area mostly marine sedimentary phosphate rock phosphate rock type, mainly carbonate - collophane complex, impurities mainly dolomite, calcite and the like. For dolomitic sedimentary phosphorus rock, reverse flotation is an effective means to remove carbonate-type gangue minerals. WSP is used as inhibitor, NS is used as collector, and WSP dosage is in the range of 1.67-3.33 mg/L. When the dosage of NS is 400mg/L, the separation effect of colloidal phosphate and dolomite is better ^[1] .

Tang Yun ZHANG Tan ^[2] WENGFU comparative tests rock sample grinding open and closed-circuit grinding, the results show that: the open-circuit grinding, P ₂ 0 ₅ phosphate concentrate grade increased by 1.8% -3.0%, the phosphorus recovery rate increased by 1.59%-4.48%, and the MgO mass fraction decreased by 0.35%-0.57%.

This study mainly explores the rational process of flotation of woven gold phosphate rock by changing the process structure, and provides reference for the processing of Zhijin phosphate rock.

Second, the test ore sample

The ore sample used in the experiment comes from the Guizhou Zhijin Phosphate Mine, which is mainly a collection of fluoroapatite containing minerals such as dolomite, calcite, montmorillonite, clay and quartz . The sample contains P ₂ 0 ₅ 22.63%, including Mg07.61% o

Third, test results and analysis

(1) Flotation process

The principle process of “stage grinding, stage selection” is shown in Figure 1.

Figure 1 "stage grinding, stage selection" principle process

(2) Relationship between grinding fineness and grinding time

Two kinds of grinding methods, rod grinding and ball milling, were selected to investigate the relationship between grinding fineness and grinding time.

Method - using XMB-Φ200×240 rod mill, the grinding mass fraction is 60.00%, and the grinding fineness is determined after grinding for 3, 5, 7 and 9 min respectively. The relationship between grinding fineness and grinding time is shown in Fig. 2. .

Figure 2 Relationship between grinding fineness and grinding time (rod mill)

In the second mode, the XMQ-Φ240 x 90 cone ball mill was used , and the grinding mass fraction was 60.00%. The grinding fineness was measured after grinding for 1, 2, 3 and 4 minutes respectively. The relationship between grinding fineness and grinding time is shown in Fig. 3. .

Comparing the two grinding methods, the results show that the ore mine uses a rod mill, and the grinding fineness changes more uniformly with time. Therefore, the subsequent grinding method of rod grinding is more suitable.

Figure 3 Relationship between grinding fineness and grinding time (ball mill)

The crude concentrate P ₂ 0 ₅ grade is 29.23%, and the MgO grade is 3.27%. The -0.074 mm particle size accounts for 54.85%. The coarse concentrate was measured by using XMB-Φ200×240 rod mill, and the grinding fineness was measured after grinding for 15, 30, 45, 60 s respectively. The relationship between fine concentrate fineness and grinding time is shown in Fig. 4.

Figure 4 Relationship between fineness of fine concentrate and grinding time

The fineness of the ore mine through the rod mill I section to -0.074 mm accounted for 54.85%, into the flotation, the second section of the grinding through the rod mill open grinding fineness to -0.074mm accounted for 75.00%, 85.00%, 97.80%. In the rough selection flotation conditions: adjusting agent 0.2 m ³ /t, collector 400 g / t, flotation time 4 min, room temperature; selected flotation conditions: adjusting agent 0.1 m ³ / t, collector 50 g / t, flotation time 3 min, the difference of flotation index under different grinding fineness was investigated under normal temperature conditions. The results are shown in Table 1.

The results show that under the condition of “stage grinding, stage selection”, the P ₂ 0 ₅ grade in the phosphate concentrate decreases with the increase of the fineness of the second stage grinding. . When the first stage grinding -0.074 mm accounted for 54.85% and the second stage grinding -0.074 mm was 75.00%, the phosphate concentrate contained P ₂ 0 ₅ 33.43%, and the P ₂ 0 ₅ recovery rate reached 84.41%, but the MgO mass fraction was higher. High, at 2.08%.

Table 1 "stage grinding, stage selection" flotation test results

Fourth, the conclusion

Mode using rod mill, and "grinding stage, and Stage" flotation process, phosphorus-containing concentrate obtained in P ₂ 0 ₅ can reach 33.43%, P ₂ 0 ₅ recovery rate of 84.41%, but higher MgO contents. , reaching 2.08%. It is indicated that the phosphorus minerals are fully dissociated, and the degree of dissociation of dolomite minerals is not enough. Further, it is necessary to further explore the process structure of reducing the mass fraction of MgO in the concentrate.

references

[1]Tang Chuanqi, Zhang Wei, Yan Song. Study on the difference of pure mineral flotation behavior between dolomite and collophanite[J].化工矿物与加工.2010,39(3):1-3.

[2]Tang Yun,Zhang Wei.Effect of Grinding Method on Flotation Index of Oufu Phosphorus Ore[J].Mining Research and Development.2001,21(1):22-24.

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