A method for recovering gold from fine mud gold ore

Abstract

The present invention discloses a method for recovering gold from a fine mud gold ore. The gold ore mud is introduced through a cyclone. After being classified by the cyclone, the coarse particle grade enters the first stirring tank of the main flotation process; the fine particle grade enters the second stirring tank of the mud flotation process, and then enters the mud flotation roughing flotation machine for roughing and the mud flotation concentrating flotation machine for concentrating in sequence, and the obtained ore mud concentrating product enters the main flotation concentrating flotation machine. The present invention further eliminates the influence of fine mud and fillers on the main process, the fine particle grade enters the mud flotation operation, and the ore mud concentrate is introduced into the main concentrating operation for re-enrichment, which fundamentally solves the problem of unstable and low-grade products of the ore mud flotation system, and further stabilizes and improves the grade and recovery rate of the gold concentrate. For the original ore with a gold grade of about 1-1.3g / t, the gold grade of the concentrate is increased from 53.83g / t to 55.14g / t, and the comprehensive recovery rate is increased from 89.75% to 89.90%.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to the optimization and transformation of a process for recovering gold from a fine-mud gold mine. Background Art

[0002] The ore source of the ore is complex and contains a large amount of clay minerals. It has a large specific surface area, is easy to absorb gold, and small gold particles are easily entrained, causing metal loss. Among them, the sulfide minerals are very fine in size, and the surface may be contaminated, which cannot fully contact with the flotation reagent, making the flotation effect worse, which is not conducive to the subsequent flotation capture of gold minerals.

[0003] In actual production, selected concentrate, selected concentrate, and sludge flotation concentrate are produced at the same time as the final concentrate. The sources of the concentrates are complex, and the concentrate grade is difficult to accurately control. At the same time, as the final concentrate output, in addition to natural minerals, some of the sludge flotation concentrate comes from underground filling materials and enters the subsequent refinery process. Because it contains some filling materials, it causes the flotation process of the subsequent smelter to have bubbling. During the flotation process, fine-grained gold-bearing minerals are not easily floated, and the gold is wrapped or adsorbed by the filling materials and cementing materials of the underground filling. The gold grade of the resulting gold concentrate and the gold recovery rate are both low.

[0004] The experimental results of mineral processing technology research show that the gold recovery rate decreases with the increase of the proportion of ore slime. Therefore, a cyclone classification operation is added before the ore washing ore slime enters the mud flotation operation. Through classification, most of the coarse particles of about 200 mesh that are easy to float are separated into the main process flotation, further eliminating the influence of fine mud and fillers on the main process. At the same time, the fine mud enters the mud flotation operation for separate treatment. The separate treatment of ore slime avoids the influence of fine mud on the main process, but the process flow of separate treatment of ore slime is relatively complicated, the production management is difficult, the stability of various indicators is also poor, and the gold grade and recovery rate of the mud flotation material are low. In order to obtain better indicators, the ore slime flotation process has high requirements for flotation conditions and flotation reagents, and the consumption is also large, resulting in a significant increase in production costs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for recovering gold from fine mud gold ore, which fundamentally solves the problem of low grade of gold concentrate in the ore mud by optimizing the ore mud flotation process from grading the input minerals to re-selecting and re-enriching the output concentrate, and stabilizes and improves the grade and recovery rate of the gold concentrate.

[0006] The technical solution of the present invention is as follows:

[0007] A method for recovering gold from a fine mud gold ore comprises a main flotation process, wherein the main flotation process comprises a first stirring tank, wherein the overflow port of the first stirring tank is connected to the feed port of a main flotation optimization flotation machine through a pipeline, the foam outlet of the main flotation optimization flotation machine is connected to a thickener, the tailings outlet of the main flotation optimization flotation machine is connected to a main flotation roughing flotation machine, the tailings outlet of the main flotation roughing flotation machine is sequentially connected to a main flotation sweeping first flotation machine and a main flotation sweeping second flotation machine through a pipeline, the foam outlet of the main flotation roughing flotation machine is connected to a main flotation selection flotation machine, the foam outlet of the main flotation selection flotation machine is connected to the thickener, and the main flotation selection flotation machine The tailings outlet is connected to the main flotation selection flotation machine, and the method also includes a mud flotation process, which includes a second stirring tank, and the second stirring tank is sequentially connected to a mud flotation roughing flotation machine and a mud flotation selection flotation machine; wherein the mud flotation selection flotation machine is connected to the main flotation selection flotation machine; the foam of the main flotation sweeping flotation machine enters the main flotation roughing flotation machine; after the gold ore mud is classified by the cyclone, the coarse particle size enters the first stirring tank; the fine particle size enters the second stirring tank, and then sequentially enters the mud flotation roughing flotation machine for roughing and the mud flotation selection flotation machine for selection, and the obtained mud selection product enters the main flotation selection flotation machine.

[0008] Preferably, in the flotation of fine-grained ore mud by the mud flotation roughing flotation machine, the concentration of fine-grained ore mud entering the mud flotation roughing flotation machine is controlled at 10-13% by controlling the pumping flow rate; the collector is a combination of bujinling and isopentyl xanthate; the frother is frother 2# oil or frother 11# oil; after the roughing operation, the gold content of the ore mud roughing foam is continuously selected and enriched, and the scraping amount of the foam product of the mud flotation roughing flotation machine is adjusted to enrich the gold content of the ore mud roughing foam to 15-20 g / t; in the flotation of fine-grained ore mud by the mud flotation concentrator flotation machine, the foam gold content of the concentrate is enriched to 30-35 g / t by adjusting the scraping amount of the foam product of the mud flotation concentrator flotation machine.

[0009] More preferably, the addition amount of the collector bujinling and the collector isopentyl xanthate is 23-27 g / t respectively; the addition amount of the 2# oil foaming agent or the 11# oil foaming agent is 23-27 g / t.

[0010] Preferably, the aeration volume is controlled at 3.5-4.5 m3 in both the flotation of fine-grained ore by the roughing flotation machine and the flotation of fine-grained ore by the concentrating flotation machine. 3 / h.

[0011] The beneficial effects of the present invention are:

[0012] The present invention provides a new process for improving the quality and product of fine mud gold ore. The ore entering the mud flotation is classified by a slurry cyclone, and most of the coarse particle materials with a size of about 200 meshes that are easy to float are separated into the main process flotation, thereby further eliminating the influence of fine mud and fillers on the main process. The fine particle grade enters the mud flotation operation, and the ore mud concentrate is introduced into the main concentration operation for re-enrichment, thereby fundamentally solving the problem of unstable products and low grade of the ore mud flotation system, and further stabilizing and improving the grade and recovery rate of the gold concentrate.

[0013] The present invention provides a new process for improving the quality and product of fine gold ore. For the original ore with a gold grade of about 1-1.3 g / t, the gold grade of the concentrate is increased from 53.83 g / t to 55.14 g / t, the comprehensive recovery rate is increased from 89.75% to 89.90%, and the gold flotation recovery rate is increased by 0.15 percentage points, thereby improving the utilization rate of gold mine resources and increasing economic benefits.

[0014] In addition, the present invention changes the foam of the second scavenging process from returning to the first scavenging process in the prior art to returning to the roughing process. On the one hand, it increases the separation time of the medium ore; on the other hand, since the roughing process has more easily separable ores and rich foam, it has a certain burden effect on the difficult-to-separate gold; thirdly, the foam of the second scavenging process returns to the roughing process, which is more conducive to improving the recovery effect of the intergrown particles that are not easy to float, thereby achieving the purpose of reducing the tailings grade and improving the flotation recovery rate. Therefore, the method of the present invention can further improve the recovery rate of gold. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a process flow chart of the method for recovering gold from fine mud gold ore.

[0016] Figure 2 It is a schematic diagram of the structure and working principle of a system embodiment adopted by the method for recovering gold from fine mud gold ore of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 2 The embodiment of the gold recovery system for fine mud gold ore for implementing the method of the present invention includes a first stirring tank 1-1, a second stirring tank 1-2, a third stirring tank 1-3, a main flotation selecting flotation machine 2-1, a main flotation selecting flotation machine 2-5, a main flotation roughing flotation machine 2-2, a first pump pool 4-1, a second pump pool 4-2, a third pump pool 4-3, a fifth pump pool 4-5, a thickener 6 and a filter press 7.

[0019] The overflow port of the first stirring tank 1-1 is connected to the feed port of the main flotation and preferred flotation machine 2-1 through a pipeline. The foam outlet of the main flotation and preferred flotation machine 2-1 is connected to the feed port of the fifth pump tank 4-5 through a pipeline, and the tailings outlet of the main flotation and preferred flotation machine 2-1 is connected to the feed port of the main flotation and roughing flotation machine 2-2. The main flotation and roughing flotation machine 2-2 is connected to the main flotation sweeping flotation machine 2-3 and the main flotation sweeping flotation machine 2-4 in sequence through pipelines. The foam outlet of the main flotation and sweeping flotation machine 2-3 is connected to the feed end of the second pump tank 4-2 through a pipeline, and the discharge end of the second pump tank 4-2 is connected to the feed port of the main flotation and preferred flotation machine 2-1 through a pipeline with a second slurry pump 3-2. The foam outlet of the main flotation sweeping second flotation machine 2-4 is connected to the feed end of the first pump pool 4-1 through a pipeline, and the discharge end of the first pump pool 4-1 is connected to the feed port of the main flotation roughing flotation machine 2-2 through a third pipe G3 with a first slurry pump 3-1, so that the foam of sweeping second returns to roughing. The tailings outlet of the main flotation sweeping second flotation machine 2-4 is connected to a fourth pipe G4 for discharging the sweeping second tailings out of the system.

[0020] The foam outlet of the main flotation roughing flotation machine 2-2 is connected to the feed end of the third pump tank 4-3 through a pipeline, and the discharge end of the third pump tank 4-3 is connected to the feed port of the main flotation selection flotation machine 2-5 through a pipeline with a third slurry pump 3-3. The foam outlet of the main flotation selection flotation machine 2-5 is connected to the feed port of the fifth pump tank 4-5 through a pipeline. The tailings outlet of the main flotation selection flotation machine 2-5 is connected to the feed port of the main flotation selection flotation machine 2-1.

[0021] The discharge port of the fifth pump tank 4-5 is connected to the feed end of the thickener 6 through a pipeline with a fifth slurry pump 3-5, and the discharge end of the thickener 6 is connected to the feed port of the third stirring tank 1-3 through a tenth pipe G10, and the overflow end of the thickener 6 is connected to a ninth pipe G9 for discharging overflow water. The discharge port of the third stirring tank 1-3 is connected to the feed end of the filter press 7 through a pipeline with a sixth slurry pump 3-6, and the discharge end of the filter press 7 is used to discharge the concentrate to the concentrate storage.

[0022] Furthermore, the present embodiment further comprises a fourth pump tank 4-4, a cyclone 5, a mud flotation rougher flotation machine 2-6 and a mud flotation cleaning flotation machine 2-7.

[0023] The feed port of the cyclone 5 is connected to the second pipe G2 for introducing the gold ore slime into the cyclone 5. The sand settling port of the cyclone 5 is connected to the feed port of the first stirring tank 1-1 through a pipeline. The overflow port of the cyclone 5 is connected to the feed port of the second stirring tank 1-2 through the eighth pipe G8, and the discharge port of the second stirring tank 1-2 is connected to the feed port of the mud flotation roughing flotation machine 2-6 through the sixth pipe G6. The foam outlet of the mud flotation roughing flotation machine 2-6 is connected to the feed port of the fourth pump tank 4-4 through a pipeline, and the discharge port of the fourth pump tank 4-4 is connected to the feed port of the mud flotation fine flotation machine 2-7 through a pipeline with a fourth slurry pump 3-4. The tailings outlet of the mud flotation roughing flotation machine 2-6 is connected to the fifth pipe G5 for discharging the mud flotation roughing tailings from the system. The foam outlet of the mud flotation and selection flotation machine 2-7 is connected to the feed port of the main flotation and selection flotation machine 2-5 through the seventh pipe G7, and the ore mud selection product enters the main process selection operation. The tailings outlet of the mud flotation and selection flotation machine 2-7 is connected to the feed port of the second stirring tank 1-2.

[0024] When the system is in operation, the washed ore is crushed, ground and classified, then enters the first stirring tank 1-1 through the first pipe G1 for slurry mixing, and then enters the main flotation process. The gold ore mud is classified by the cyclone, and most of the coarse particles of about 200 mesh that are easy to float are separated into the main process flotation, further eliminating the influence of fine mud and fillers on the main process. After classification, the fine particles enter the mud flotation operation.

[0025] like Figure 1 The process embodiment of the method for recovering gold from fine mud gold ore of the present invention comprises the following steps:

[0026] By classifying the ore entering the mud flotation process through a slurry cyclone, most of the coarse particles of about 200 mesh that are easy to float are separated into the main process flotation, further eliminating the influence of fine mud and fillers on the main process. The fine particles after classification enter the mud flotation operation. Through transformation, the mud concentrate is introduced into the main process selection operation for re-enrichment, which fundamentally solves the problems of unstable products and low grade of the mud flotation system, and further stabilizes and improves the grade and recovery rate of the gold concentrate.

[0027] The present invention introduces gold ore slime through the cyclone 5. After classification by the cyclone 5, the coarse particle size enters the first stirring tank 1-1 of the main flotation process; the fine particle size enters the second stirring tank 1-2 of the mud flotation process, and then enters the mud flotation roughing flotation machine 2-6 for roughing and the mud flotation concentrating flotation machine 2-7 for concentrating in sequence. The obtained slime concentrating product enters the main flotation concentrating flotation machine 2-5.

[0028] The main flotation process adopts conventional flotation technology.

[0029] The flotation process parameters of the fine-grained ore mud by the mud flotation roughing flotation machine 2-6 of the embodiment of the present invention are: the gold grade of the ore mud is about 1-1.3g / t (before the cyclone classification), the concentration of the fine-grained ore mud entering the mud flotation roughing flotation machine 2-6 is controlled at 13% by controlling the pumping flow rate, the amount of gold-catching agent and isopentyl xanthate added as a collector is 25g / t each, the amount of 2# oil foaming agent or 11# oil foaming agent added is 25g / t, and the foaming agent 2# oil and the foaming agent 11# oil are used every other month. After the roughing operation, the ore mud roughing foam concentration is controlled at about 3% by adjusting the amount of foam product scraped out of the mud flotation roughing flotation machine 2-6, and the gold grade of the ore mud roughing foam is enriched to about 20g / t.

[0030] The flotation process parameters of the fine-grained ore mud by the mud flotation selection flotation machine 2-7 are: the aeration volume is controlled at 4m 3 / h, and the gold grade of the concentrate foam is enriched to about 30g / t by adjusting the scraping amount of the foam product of the mud flotation concentration flotation machine 2-7.

[0031] The present invention conducts an experimental comparison of the processes before and after the ore slime concentrate is incorporated into the main flotation process (after the ore slime concentrate is incorporated into the main flotation process, that is, the flotation method of the embodiment), and the results are shown in Tables 1 and 2.

[0032] Table 1 Production data of sludge concentrate before incorporation into the main flotation process

[0033]

[0034] Note: The concentrate gold grade in the table is the gold grade returned by the refinery in that month.

[0035] Table 2 Production data after the sludge concentrate is incorporated into the main flotation process

[0036]

[0037] Note: The concentrate gold grade in the table is the gold grade returned by the refinery in that month.

[0038] Comparison of the data in Table 1 and Table 2 shows that the present invention achieves stable output of concentrate. When the input grade is reduced, the concentrate grade is increased from 53.83 g / t to 55.14 g / t, the comprehensive recovery rate is increased from 89.75% to 89.90%, and the gold return ratio is increased from 97.19% to 97.29%.

Claims

1. A method for recovering gold from a fine mud gold ore, comprising a main flotation process, the main flotation process comprising a first stirring tank (1-1), the overflow port of the first stirring tank (1-1) being connected to a feed port of a main flotation optimization flotation machine (2-1) through a pipeline, the foam outlet of the main flotation optimization flotation machine (2-1) being connected to a thickener (6), the tailings outlet of the main flotation optimization flotation machine (2-1) being connected to a main flotation roughing flotation machine (2-2), the main flotation roughing flotation machine The tailings outlet of the machine (2-2) is connected to the main flotation sweeping flotation machine (2-3) and the main flotation sweeping flotation machine (2-4) in sequence through pipelines, the foam outlet of the main flotation roughing flotation machine (2-2) is connected to the main flotation cleaning flotation machine (2-5), the foam outlet of the main flotation cleaning flotation machine (2-5) is connected to the thickener (6), and the tailings outlet of the main flotation cleaning flotation machine (2-5) is connected to the main flotation cleaning flotation machine (2-1), characterized in that: The method further comprises a mud flotation process, which comprises a second stirring tank (1-2), the second stirring tank (1-2) being sequentially connected to a mud flotation roughing flotation cell (2-6) and a mud flotation concentrating flotation cell (2-7); wherein the mud flotation concentrating flotation cell (2-7) is connected to the main flotation concentrating flotation cell (2-5); the foam of the main flotation sweeping flotation cell (2-4) enters the main flotation roughing flotation cell (2-2); after the gold ore mud is classified by a cyclone (5), the coarse particle size enters the first stirring tank (1-1); the fine particle size enters the second stirring tank (1-2), and then sequentially enters the mud flotation roughing flotation cell (2-6) for roughing and the mud flotation concentrating flotation cell (2-7) for concentrating, and the obtained mud concentrating product enters the main flotation concentrating flotation cell (2-5).

2. The method for recovering gold from fine mud gold ore according to claim 1, characterized in that: In the flotation of fine-grained ore mud by the mud flotation roughing flotation machine (2-6), the concentration of fine-grained ore mud entering the mud flotation roughing flotation machine (2-6) is controlled at 10-13% by controlling the pumping flow rate; the collector is a combination of bujinling and isopentyl xanthate; the frother is frother 2# oil or frother 11# oil; after the roughing operation, the ore mud is continuously selected and enriched, and the scraping amount of the foam product of the mud flotation roughing flotation machine (2-6) is adjusted to enrich the roughing foam gold grade of the ore mud to 15-20g / t; in the flotation of fine-grained ore mud by the mud flotation concentrating flotation machine (2-7), the foam gold grade of the concentrate is enriched to 30-35g / t by adjusting the scraping amount of the foam product of the mud flotation concentrating flotation machine (2-7).

3. The method for recovering gold from fine mud gold ore according to claim 2, characterized in that: The addition amount of the collector, bujinling, and the collector, isopentyl xanthate, is 23-27 g / t respectively; the addition amount of the 2# oil foaming agent or the 11# oil foaming agent is 23-27 g / t.

4. The method for recovering gold from fine mud gold ore according to claim 1, 2 or 3, characterized in that: In the flotation of fine-grained ore slimes by the roughing flotation machine (2-6) and in the flotation of fine-grained ore slimes by the cleaning flotation machine (2-7), the aeration volume is controlled at 3.5 to 4.5 m³ / h.

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