Experimental study on beneficiation process of a bismuth-zinc-iron polymetallic ore

A bismuth iron zinc multi-metal mine is a large skarn deposits. Through rock identification, heavy sand identification, X-ray analysis, spectral analysis and chemical analysis, it is found that the metal minerals in the ore have magnetite, hematite, mirror iron ore, limonite, sphalerite, pyrrhotite. , pyrite, copper ore, bornite, chalcocite blue, malachite, arsenopyrite, native bismuth, bismuthinite, bismuthinite lead ore, molybdenite, scheelite galena and the like, pulse there minerals Ca, Fe garnet, calcite, mica, amphibole, quartz, apatite, fluorite, zircon, chlorite, tremolite diopside and the like.

I. ICP spectrum analysis of raw ore and analysis of main chemical components

The semi-quantitative analysis results of the original ore ICP emission spectrum are shown in Table 1. The main chemical composition analysis results are shown in Table 2.

Table 1 ICP spectral analysis results of raw ore P%

Table 2 Analysis results of main chemical components of ore P%

It can be seen from Table 1 and Table 2 that the main metals in the ore that meet the selected metal grade and can be recovered by the beneficiation method are bismuth, zinc and iron, namely stibnite, sphalerite and magnetite. Comprehensive recovery of precious metals indium and silver , in addition, comprehensive recovery of copper, molybdenum and lead should also be considered.

The ore contains 0.093% copper, 0.039% molybdenum and 0.16% lead. The useful metal grade is low, and they have not reached the comprehensive grade. In the sorting process, it is considered to first concentrate the silver, copper, molybdenum and lead which are low in content but very good in floatability into the antimony concentrate, and then separately recover them later.

The metal sulfide ore in the ore is finer in size. Previous research data show that it is difficult to obtain iron concentrates with sulfur content after the first magnetic post-floating process, and the recovery rate of the main metal strontium and zinc that needs to be recovered will be correspondingly reduced. Therefore, the process of first floating and magnetic principle is decided.

Second, the rough selection conditions test

(1) Grinding fineness condition test

A total of four fine-grained grinding conditions were tested, and the fineness of grinding was -74 μm, accounting for 70%, 75%, 80% and 85%, respectively. The test procedure for rough selection conditions is shown in Figure 1. The effect of grinding fineness on the coarse selection criteria is shown in Figure 2.

Figure 1 é“‹ rough selection conditions test process

Fig. 2 Effect of grinding fineness on coarsening and sorting index

It can be seen from Fig. 2 that with the increase of grinding fineness, the recovery rate of antimony in concentrates gradually increases, but the grade of concentrates does not fluctuate much. When the grinding fineness -74μm reaches 80% or more, the increase in the recovery rate of strontium in the concentrate begins to decrease. In the case where the rough selection focuses on the recovery rate of the crucible, the fineness of the rough grinding is tentatively set at -74 μm to account for 80%.

(B) BBY action time condition test

Under the condition that the fixed fineness of coarse grinding is -74μm and 80%, the suitable action time of BBY is explored. Four conditional tests were arranged and the BBY action times were 0, 2, 4 and 6 min, respectively. The test procedure is similar to that of Figure 1. The effect of BBY action time on the coarse selection criteria is shown in Figure 3.

Fig. 3 Effect of BBY action time on coarse selection and sorting index

It can be seen from Fig. 3 that when the BBY action time is between 0 and 2 min, the recovery rate of the antimony in the concentrate is higher, the grade of the concentrate is also higher, and the sorting index is better. From the case where the rough selection is focused on the recovery rate, the action time of the BBY is determined to be 2 min.

(3) BBY dosage condition test

The fixed BBY action time was 2 min and the grinding fineness was -74 μm, accounting for 80%. Four BBY dosage conditions were tested, the dosages were 25, 50, 75 and 100 g Pt respectively. The test procedure was similar to that of Figure 1. The effect of BBY dosage on the coarse selection criteria was shown in Figure 4.

Figure 4 Effect of BBY dosage on rough selection and selection

It can be seen from Fig. 4 that when the amount of BBY is small, the grade of concentrate is higher and the recovery rate is lower; as the amount of BBY increases, the grade of concentrate has decreased and the recovery rate has a certain increase. Considering the grade and recovery rate of coarsely selected concentrates, the amount of BBY used in the rough selection is 50gPt.

(4) AF dosage condition test

The amount of fixed BBY was 50 gPt, and the action time was 2 min. Four AF dosage conditions were tested, the dosages were 28, 42, 56 and 70 g Pt respectively. The test procedure was similar to that of Figure 1. The effect of AF dosage on the coarse selection criteria was shown in Fig. 5.

Figure 5 Effect of AF dosage on coarse selection and sorting index

It can be seen from Fig. 5 that with the increase of the amount of AF, the grade of the coarse-choice concentrate is rapidly reduced and tends to be stable, while the recovery rate of strontium is rapidly rising and gradually becoming stable. Considering the concentrate grade and recovery rate, the amount of AF for the rough selection is 42gPt.

(5) DP dosage condition test

The fixed AD dosage was 1000 g Pt, the BBY dosage was 50 g Pt, and the action time was 2 min. Four DP dosage conditions were arranged, the dosages were 0, 250, 500 and 750 g Pt respectively. The test procedure was similar to that of Figure 1. The effect of DP dosage on the coarse selection criteria was shown in Fig. 6.

Figure 6 Effect of DP dosage on coarse selection and sorting index

It can be seen from Fig. 6 that when the DP dosage exceeds 500 gPt, the grade of the concentrate is rapidly increased, and the recovery rate is rapidly decreased. Considering the grade and recovery rate of coarsely selected concentrates, the amount of DP selected for rough selection is 500gPt.

(6) AD dosage condition test

The fixed DP dosage is 500gPt, the BBY dosage is 50gPt, the AF dosage is 42gPt, and the appropriate amount of AD for rough selection is explored. Four AD dosage conditions tests were arranged, the dosages were 0, 500, 1000 and 1500 gPt respectively. The test procedure was similar to that of Figure 1. The effect of AD dosage on the coarse selection criteria was shown in Fig. 7.

Figure 7 Effect of AD dosage on rough selection and selection

It can be seen from Fig. 7 that when the amount of AD is 1000gPt, the concentrate grade is the highest when the recovery rate of concentrate is basically unchanged, so the amount of AD for the rough selection is 1000gPt.

(7) Water glass dosage condition test

In the case where AD and DP were not added, the amount of fixed BBY was 50 gPt, and the amount of AF was 42 gPt, and the appropriate amount of water for glass selection was explored. Four water glass dosage conditions were tested, the dosages were 0, 250, 500 and 750 gPt respectively. The test procedure was similar to that of Figure 1. The effect of water glass dosage on the coarse selection criteria was shown in Fig. 8.

Fig. 8 Effect of water glass dosage on coarsening and sorting index

It can be seen from Fig. 8 that with the increase of the amount of water glass, the grade and recovery rate of concentrates have a certain extent, so there is no need to add water glass during rough selection.

Third, the conclusion

Through the system's rough selection process parameter condition test, the following conclusions are initially obtained with a focus on the rough recovery of the base metal recovery rate:

1. BBY has a good selective collection effect on stibnite. The AF viscosity is low, and it has good selectivity, which can greatly improve the grade of coarse and fine concentrate. Water glass does not improve the coarse selection criteria.

2. The preferred conditions for rough selection of grinding fineness and related dosages are as follows: grinding fineness -74μm accounts for 80%, BBY50gPt, AF42gPt, DP500gPt, AD1000gPt.

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