Resource utilization method of extremely low-grade zinc oxide ore

Abstract

The invention discloses a resource utilization method of extremely-low-grade zinc oxide ores, which adopts a combined process of coarse grinding, coarse grain strong magnetic separation pre-enrichment and fine grinding flotation quality improvement, integrates low-grade and high-argillaceous zinc oxide, and compared with a process for recovering zinc oxide through single flotation, the method has the advantages that the ore grinding cost is greatly reduced, and the adverse effect of slime on zinc oxide flotation is reduced; and through coarse-grain high-intensity magnetic separation pre-enrichment, the boundary grade of industrial ores of mine enterprises can be reduced, the reserves can be increased, the exploitable quantity of the ores can be increased, and the resource development utilization rate can be increased.

Description

Technical Field

[0001] The invention relates to the technical field of ore resource utilization, and in particular to a method for resource utilization of extremely low-grade zinc oxide ore. Background Art

[0002] The formation of zinc oxide ore is mainly due to the long-term action of exposed zinc sulfide deposits with O2, H2O, CO2 and biological organic matter, which forms an oxidation zone of a certain thickness on the surface of the zinc sulfide deposit. The geological environment is usually more complex, so there are many types of zinc oxide ores. Calcite, quartz, dolomite, clay, iron oxides and hydroxides are the most common gangue minerals in zinc oxide ores.

[0003] At present, the industrial treatment of zinc oxide ore mainly adopts flotation method. For a long time, domestic and foreign scholars have done a lot of research on zinc oxide flotation and developed a series of flotation methods, such as direct flotation method with fatty acid collectors, flotation method with chelating collectors, flotation method with mercaptan collectors, sulfide-amine flotation method and sulfide-xanthate flotation method, etc. However, each flotation method has its own shortcomings, and a single flotation method cannot solve the problem of difficult treatment of zinc oxide ore.

[0004] When the sulfide xanthate method or mercaptan collector flotation method is used to treat zinc oxide ore, due to the poor natural floatability of smithsonite, the Zn exposed by the surface fracture 2+The active sites have very weak interaction with thiol collectors such as xanthate and mercaptan, so it is difficult for the collectors to adsorb on the surface of smithsonite or they are very easy to fall off after adsorption. When using fatty acid collectors to directly float smithsonite, since smithsonite and calcite and dolomite in the gangue minerals have the same carbonate structure and similar surface properties, and the carboxyl group of fatty acid collectors has a strong chelating ability with calcium, the collector consumption increases and the selectivity is poor. Zinc oxide ore is brittle and easy to be over-grinded, and it is very easy to become muddy. Although pre-demuding can improve the flotation effect, it also causes a large amount of zinc metal loss. Zinc oxide ore has a high content of soluble salts, and various ions and carbonate ions form precipitates, which cover the surface of the mineral, hinder the flotation of zinc oxide minerals, and make it difficult to select and utilize. Due to the existence of these problems, in recent years, more and more professionals in the field of mineral processing research have begun to invest in processes other than flotation for the recovery of zinc oxide ore, especially the research and application of combined processes of hydrometallurgy, gravity separation, magnetic separation and other methods. When processing zinc oxide ores with relatively coarse particle size and high zinc oxide grade, gravity separation technology is used for tailing treatment; when processing zinc oxide ores with high iron content, a magnetic flotation combined process of magnetic separation for iron separation and flotation for zinc recovery is used; when processing zinc oxide ores with relatively low grade, a flotation + wet leaching combined process is used, flotation pre-enrichment, improving the grade of wet raw materials, reducing calcium and magnesium carbonate minerals, and reducing acid consumption. These combined processes have improved the recovery effect of zinc oxide ores to a certain extent and improved the beneficiation index of zinc oxide ores, but they still cannot solve the key problems in the recovery of low-grade zinc oxide ores (original ore containing zinc <2.5%), which are prominently manifested in high energy consumption, inability to balance enrichment ratio and recovery rate, and high cost of processing ton of ore.

[0005] Therefore, developing a mineral processing technology with good separation effect, strong adaptability and low production cost will help to efficiently recover low-grade zinc oxide ore and realize the resource utilization of low-grade ore. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention aims to provide a method for resource utilization of extremely low-grade zinc oxide ore.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A method for resource utilization of extremely low-grade zinc oxide ore comprises the following steps:

[0009] S1. Coarse grinding: Mix the crushed raw ore with water and grind it;

[0010] S2, zinc oxide strong magnetic separation roughing: the ground material obtained in step S1 is subjected to multi-stage zinc oxide strong magnetic separation roughing operation, and the strong magnetic separation roughing tailings obtained from each stage of zinc oxide strong magnetic separation roughing operation enter the next stage of zinc oxide strong magnetic separation roughing operation, and the tailings obtained from the last stage of zinc oxide strong magnetic separation roughing operation are magnetic separation tailings;

[0011] S3, combining the high intensity magnetic roughing concentrates obtained from the high intensity magnetic roughing operations of zinc oxide at each level in step S2 and then fine grinding them;

[0012] S4, zinc oxide flotation roughing operation: to the finely ground product obtained in step S3, a regulating agent sodium carbonate, water glass, an activating agent sodium sulfide and a collecting agent dodecylamine are sequentially added, and then zinc oxide flotation roughing operation is performed, and the obtained zinc oxide rough concentrate enters the zinc oxide flotation cleaning operation I of step S7, and the obtained roughing tailings enters the zinc oxide flotation scavenging operation I of step S5;

[0013] S5, zinc oxide flotation scavenging operation 1: adding adjusting agent sodium carbonate, water glass, activating agent sodium sulfide and collecting agent dodecylamine to the roughing tailings obtained in step S4 in sequence, and then performing zinc oxide flotation scavenging operation 1, the obtained zinc oxide scavenging concentrate 1 is returned to the zinc oxide flotation roughing operation, and the obtained scavenging tailings 1 enter the zinc oxide flotation scavenging operation 2 of step S6;

[0014] S6, zinc oxide flotation scavenging operation 2: adding a regulating agent, sodium carbonate, water glass, an activating agent, and a collecting agent, dodecylamine, to the scavenging tailings obtained in step S5 in sequence, and then performing zinc oxide flotation scavenging operation 2, the obtained zinc oxide scavenging concentrate is returned to the zinc oxide flotation scavenging operation 1, and the obtained scavenging tailings 2 are flotation tailings;

[0015] S7, zinc oxide flotation and selection operation 1: adding activating agent sodium sulfide to the zinc oxide roughing concentrate obtained in step S4, and then performing zinc oxide flotation and selection operation 1, the obtained zinc oxide flotation and selection concentrate 1 enters zinc oxide flotation and selection operation 2, and the obtained selection tailings 1 are returned to the zinc oxide flotation and selection operation 2;

[0016] S8, zinc oxide flotation and selection operation II: adding activating agent sodium sulfide to the zinc oxide flotation and selection concentrate I obtained in step S7, and then performing zinc oxide flotation and selection operation II, the obtained zinc oxide selection concentrate II is the zinc oxide concentrate, and the obtained selection tailings II are returned to the zinc oxide flotation and selection operation I.

[0017] Furthermore, in step S1, the raw ore is crushed to less than 2 mm, and then mixed with water in a ratio of 2:1 and fed into a mill for grinding, and the ore is ground until the product fineness is -0.3 mm, accounting for 60%.

[0018] Furthermore, in step S2, the magnetic field strength of each level of zinc oxide strong magnetic roughing operation is 1.35-1.75T, and the pulsation frequency is adjusted to 0-10 times / minute.

[0019] Furthermore, in step S3, the high intensity magnetic separation roughing concentrates obtained from the high intensity magnetic separation roughing operations of zinc oxide at various levels are combined to adjust the pulp mass concentration to 60%-65%, and the fineness of the finely ground product is -0.074mm and the content accounts for 55%-60%.

[0020] Further, in step S4, based on the dry weight of the original ore, the amount of sodium carbonate is 1200g / t-1500g / t, the amount of water glass is 1200g / t-1500g / t, the amount of sodium sulfide is 2000-3000g / t, and the amount of dodecylamine is 40g / t-60g / t.

[0021] Further, in step S5, based on the dry weight of the original ore, the amount of sodium carbonate is 500g / t-800g / t, the amount of water glass is 500g / t-800g / t, the amount of sodium sulfide is 500g / t-1000g / t, and the amount of dodecylamine is 20g / t-30g / t.

[0022] Further, in step S6, based on the dry weight of the original ore, the amount of sodium carbonate is 100g / t-300g / t, the amount of water glass is 100g / t-300g / t, the amount of sodium sulfide is 200g / t-400g / t, and the amount of dodecylamine is 10g / t-20g / t.

[0023] Furthermore, in steps S4, S5 and S6, the stirring time after adding sodium carbonate, water glass, sodium sulfide and dodecylamine is 2 minutes, 2 minutes, 1 minute and 2 minutes respectively.

[0024] Furthermore, in step S7, the amount of sodium sulfide used is 300 g / t-500 g / t per ton of dry weight of the original ore, and the mixture is stirred for 1 minute after adding the sodium sulfide.

[0025] Furthermore, in step S8, the amount of sodium sulfide used is 100 g / t-200 g / t per ton of dry weight of the original ore, and the mixture is stirred for 1 minute after adding the sodium sulfide.

[0026] The beneficial effects of the present invention are:

[0027] 1. The method of the present invention realizes the pre-disposal of coarse particles of low-grade zinc oxide minerals through coarse grinding-coarse particle strong magnetic separation pre-enrichment, and can pre-disposal of tailings through strong magnetic separation process, with high tailing yield, low zinc loss rate, good pre-enrichment effect, and greatly reduces the amount of ore for subsequent fine grinding and flotation quality improvement, thus greatly reducing the grinding cost.

[0028] 2. The method of the present invention realizes the removal of primary ore slime and influencing ions in the process of magnetic separation pre-enrichment through coarse grinding-coarse particle strong magnetic separation pre-enrichment, fully solves the influence of primary ore slime and influencing ions on the flotation process in a single flotation process, thereby improving the quality and recovery rate of zinc oxide concentrate.

[0029] 3. The method of the present invention uses coarse grinding-coarse-grained strong magnetic separation pre-enrichment to achieve a tailing rate of 60%-70% and an enrichment ratio of 2%-3%, which can minimize the grade of zinc oxide ore entering the mine, realize the resource utilization of low-grade zinc oxide ore, improve the comprehensive utilization rate of resources, and extend the service life of the mine.

[0030] 4. The method of the present invention fully utilizes the respective characteristics and advantages of magnetic separation and flotation processes through a combined magnetic flotation process, exerts the synergistic effect of magnetic separation and flotation, and achieves the ultimate goal of magnetic separation pre-discarding tailings-flotation quality improvement; it exhibits the process advantages of low grinding cost, simple and stable process flow, and good product recovery effect.

[0031] In summary, the method of the present invention adopts a combined process of coarse grinding-coarse-grained strong magnetic separation pre-enrichment-fine grinding flotation quality improvement, and comprehensively recovers low-grade, high-mud zinc oxide. Compared with the single flotation recovery process of zinc oxide, the grinding cost is greatly reduced, the adverse effect of ore slime on zinc oxide flotation is reduced, and the recovery index of the mineral processing process is improved. In addition, the pre-enrichment of coarse-grained strong magnetic separation can reduce the boundary grade of industrial ore of mining enterprises, increase reserves, increase the exploitable amount of ore, and improve the utilization rate of resource development. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of the method of Embodiment 1-2 of the present invention.

[0033] In the figure:

[0034] K: zinc oxide concentrate; X1: magnetic separation tailings; X2: flotation tailings; a: raw ore; b: strong magnetic separation rougher concentrate 1; c: strong magnetic separation rougher concentrate 2; d: strong magnetic separation rougher concentrate 3; e: strong magnetic separation rougher concentrate 4; g: sodium carbonate; h: water glass; i: sodium sulfide; j: dodecylamine. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0036] The low-grade zinc oxide ore in a certain mining area is mainly smithsonite, and the zinc oxidation rate is above 95%. Different ore samples from two ore bodies in the mining area were used for test comparison. The original ore used in Example 1 contained Zn1.18%, Pb0.12%, and the zinc oxidation rate was 97.68%; the original ore used in Example 2 contained Zn2.07%, Pb0.16%, and the zinc oxidation rate was 96.36%.

[0037] Example 1

[0038] This embodiment provides a method for resource utilization of extremely low-grade zinc oxide ore, such as Figure 1 As shown, specifically:

[0039] The raw ore (a) crushed to less than 2 mm is mixed with water in a mass ratio of 2:1 and fed into a mill for grinding until the product fineness is -0.3 mm, accounting for 60%.

[0040] The ground material is passed through the SLON-100 high gradient strong magnetic separator for zinc oxide strong magnetic separation roughing operation 1, the magnetic field strength is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 1 (b), and the strong magnetic separation roughing tailing 1 enters the zinc oxide strong magnetic separation roughing operation 2. The magnetic field strength of the zinc oxide strong magnetic separation roughing operation 2 is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 2 (c), and the strong magnetic separation roughing tailing 2 enters the zinc oxide strong magnetic separation roughing operation 3. The magnetic field strength of the zinc oxide strong magnetic separation roughing operation 3 is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 3 (d), and the strong magnetic separation roughing tailing 3 enters the zinc oxide strong magnetic separation roughing operation 4. The magnetic field intensity of the zinc oxide strong magnetic roughing operation is 1.7T, and the pulsation frequency is adjusted to 10 times / minute. The material enriched in the magnetic medium box is the strong magnetic roughing concentrate 4 (e), and the strong magnetic roughing tailings are the magnetic tailings (X1).

[0041] The strong magnetic rougher concentrate 1, the strong magnetic rougher concentrate 2, the strong magnetic rougher concentrate 3 and the strong magnetic rougher concentrate 4 are combined, concentrated to a mass concentration of 60%, added into a ball mill for fine grinding, and the grinding product fineness is -0.074mm and the content is 55%.

[0042] The finely ground product is added to the hanging tank flotation machine, and sodium carbonate (g) is added in an amount of 1200g / t per ton of dry weight of the original ore. After stirring for 2 minutes, water glass (h) is added in an amount of 1200g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 2000g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 40g / t. After stirring for 2 minutes, zinc oxide flotation roughing operation is carried out, zinc oxide coarse concentrate (foam product) enters zinc oxide flotation cleaning operation 1, and zinc oxide roughing tailings (in-tank product) enter zinc oxide flotation scavenging operation 1.

[0043] Based on the dry weight of each ton of raw ore, sodium carbonate (g) is added to the zinc oxide roughing tailings tank in an amount of 500g / t. After stirring for 2 minutes, water glass (h) is added in an amount of 500g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 500g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 20g / t. After stirring for 2 minutes, zinc oxide flotation scavenging operation 1 is carried out. The zinc oxide scavenging concentrate (foam product) is returned to the zinc oxide flotation roughing operation, and the scavenging tailings (product in the tank) enter the zinc oxide flotation scavenging operation 2.

[0044] Based on the dry weight of each ton of raw ore, sodium carbonate (g) is added to the zinc oxide scavenging tailings tank in an amount of 100g / t. After stirring for 2 minutes, water glass (h) is added in an amount of 100g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 200g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 10g / t. After stirring for 2 minutes, the zinc oxide flotation scavenging operation is carried out. The zinc oxide scavenging concentrate (foam product) is returned to the zinc oxide flotation scavenging operation. The scavenging tailings (product in the tank) are the flotation tailings (X2).

[0045] The zinc oxide roughing concentrate is added to the flotation tank, and sodium sulfide (i) is added in an amount of 300 g / t per ton of dry weight of the raw ore. After stirring for 1 minute, the zinc oxide flotation selection operation 1 is carried out, and the zinc oxide flotation selection 1 concentrate (foam product) enters the zinc oxide flotation selection operation 2, and the selection 1 tailings (product in the tank) are returned to the zinc oxide flotation roughing operation. The zinc oxide flotation selection 1 concentrate is added to the flotation tank, and sodium sulfide (i) is added in an amount of 100 g / t. After stirring for 1 minute, the zinc oxide flotation selection operation 2 is carried out, and the zinc oxide selection 2 concentrate (foam product) is the zinc oxide concentrate (K), and the selection 2 tailings (product in the tank) are returned to the zinc oxide flotation selection operation 1.

[0046] Example 2

[0047] This embodiment provides a method for resource utilization of extremely low-grade zinc oxide ore, such as Figure 1 As shown, specifically:

[0048] The raw ore (a) crushed to less than 2 mm is mixed with water in a mass ratio of 2:1 and fed into a mill for grinding until the product fineness is -0.3 mm, accounting for 60%.

[0049] The ground material is passed through the SLON-100 high gradient strong magnetic separator for zinc oxide strong magnetic separation roughing operation 1, the magnetic field strength is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 1 (b), and the strong magnetic separation roughing tailing 1 enters the zinc oxide strong magnetic separation roughing operation 2. The magnetic field strength of the zinc oxide strong magnetic separation roughing operation 2 is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 2 (c), and the strong magnetic separation roughing tailing 2 enters the zinc oxide strong magnetic separation roughing operation 3. The magnetic field strength of the zinc oxide strong magnetic separation roughing operation 3 is 1.7T, the pulsation pulse is adjusted to 10 times / minute, the material enriched in the magnetic medium box is strong magnetic separation roughing concentrate 3 (d), and the strong magnetic separation roughing tailing 3 enters the zinc oxide strong magnetic separation roughing operation 4. The magnetic field intensity of the zinc oxide strong magnetic roughing operation is 1.7T, and the pulsation frequency is adjusted to 10 times / minute. The material enriched in the magnetic medium box is the strong magnetic roughing concentrate 4 (e), and the strong magnetic roughing tailings are the magnetic tailings (X1).

[0050] The strong magnetic rougher concentrate 1, the strong magnetic rougher concentrate 2, the strong magnetic rougher concentrate 3 and the strong magnetic rougher concentrate 4 are combined, concentrated to a mass concentration of 60%, added into a ball mill for fine grinding, and the grinding product fineness is -0.074mm and the content is 60%.

[0051] The finely ground product is added to the hanging tank flotation machine, and sodium carbonate (g) is added in an amount of 1500g / t per ton of dry weight of the original ore. After stirring for 2 minutes, water glass (h) is added in an amount of 1500g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 3000g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 60g / t. After stirring for 2 minutes, zinc oxide flotation roughing operation is carried out, zinc oxide coarse concentrate (foam product) enters zinc oxide flotation cleaning operation 1, and roughing tailings (in-tank product) enter zinc oxide flotation scavenging operation 1.

[0052] Based on the dry weight of each ton of raw ore, sodium carbonate (g) is added to the zinc oxide roughing tailings tank in an amount of 800g / t. After stirring for 2 minutes, water glass (h) is added in an amount of 800g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 1000g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 30g / t. After stirring for 2 minutes, zinc oxide flotation scavenging operation 1 is carried out. The zinc oxide scavenging concentrate (foam product) of zinc oxide scavenging operation 1 is returned to the zinc oxide roughing operation, and the scavenging tailings (product in the tank) of scavenging operation 1 enters the zinc oxide flotation scavenging operation 2.

[0053] Based on the dry weight of each ton of raw ore, sodium carbonate (g) is added to the zinc oxide scavenging tailings tank in an amount of 300g / t. After stirring for 2 minutes, water glass (h) is added in an amount of 300g / t. After stirring for 2 minutes, sodium sulfide (i) is added in an amount of 400g / t. After stirring for 1 minute, collector dodecylamine (j) is added in an amount of 20g / t. After stirring for 2 minutes, zinc oxide flotation scavenging operation II is carried out. The zinc oxide scavenging II concentrate (foam product) is returned to the zinc oxide scavenging operation I, and the scavenging II tailings (product in the tank) are flotation tailings (X2).

[0054] The zinc oxide roughing concentrate is added to the flotation tank, and sodium sulfide (i) is added in an amount of 500 g / t per ton of dry weight of the raw ore. After stirring for 1 minute, the zinc oxide flotation selection operation 1 is carried out, and the zinc oxide flotation selection 1 concentrate (foam product) enters the zinc oxide flotation selection operation 2, and the selection 1 tailings (product in the tank) are returned to the zinc oxide flotation roughing operation. The zinc oxide flotation selection 1 concentrate is added to the flotation tank, and sodium sulfide (i) is added in an amount of 200 g / t. After stirring for 1 minute, the zinc oxide flotation selection operation 2 is carried out, and the zinc oxide selection 2 concentrate (foam product) is the zinc oxide concentrate (K), and the selection 2 tailings (product in the tank) are returned to the zinc oxide flotation selection operation 1.

[0055] The specific process indicators of the above-mentioned embodiment 1 and embodiment 2 are shown in Table 1.

[0056] Table 1

[0057]

[0058] As can be seen from Table 1, the raw ore of Example 1 contains Zn1.18%, the zinc oxidation rate is 97.68%, the zinc oxide concentrate contains 28.18% zinc, and the zinc recovery rate is 81.28%; the coarse magnetic separation pre-discarding tailing rate is 60.46%, and the coarse magnetic separation pre-discarding tailing zinc loss rate is 15.95%. The raw ore of Example 2 contains Zn2.07%, the zinc oxidation rate is 96.36%, the zinc concentrate contains 29.79% zinc, and the zinc recovery rate is 84.16%; the coarse magnetic separation pre-discarding tailing rate is 61.87%, and the coarse magnetic separation pre-discarding tailing zinc loss rate is 12.87%.

[0059] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. A method for resource utilization of extremely low-grade zinc oxide ore, characterized in that: The steps include: S1. Coarse grinding: Mix the crushed raw ore with water and grind it; S2, zinc oxide strong magnetic separation roughing: the ground material obtained in step S1 is subjected to multi-stage zinc oxide strong magnetic separation roughing operation, and the strong magnetic separation roughing tailings obtained from each stage of zinc oxide strong magnetic separation roughing operation enter the next stage of zinc oxide strong magnetic separation roughing operation, and the tailings obtained from the last stage of zinc oxide strong magnetic separation roughing operation are magnetic separation tailings; S3, combining the high intensity magnetic roughing concentrates obtained from the high intensity magnetic roughing operations of zinc oxide at each level in step S2 and then fine grinding them; S4, zinc oxide flotation roughing operation: to the finely ground product obtained in step S3, a regulating agent sodium carbonate, water glass, an activating agent sodium sulfide and a collecting agent dodecylamine are sequentially added, and then zinc oxide flotation roughing operation is performed, and the obtained zinc oxide rough concentrate enters the zinc oxide flotation cleaning operation I of step S7, and the obtained roughing tailings enters the zinc oxide flotation scavenging operation I of step S5; S5, zinc oxide flotation scavenging operation 1: adding adjusting agent sodium carbonate, water glass, activating agent sodium sulfide and collecting agent dodecylamine to the roughing tailings obtained in step S4 in sequence, and then performing zinc oxide flotation scavenging operation 1, the obtained zinc oxide scavenging concentrate 1 is returned to the zinc oxide flotation roughing operation, and the obtained scavenging tailings 1 enter the zinc oxide flotation scavenging operation 2 of step S6; S6, zinc oxide flotation scavenging operation 2: adding a regulating agent, sodium carbonate, water glass, an activating agent, and a collecting agent, dodecylamine, to the scavenging tailings obtained in step S5 in sequence, and then performing zinc oxide flotation scavenging operation 2, the obtained zinc oxide scavenging concentrate is returned to the zinc oxide flotation scavenging operation 1, and the obtained scavenging tailings 2 are flotation tailings; S7, zinc oxide flotation and selection operation 1: adding activating agent sodium sulfide to the zinc oxide roughing concentrate obtained in step S4, and then performing zinc oxide flotation and selection operation 1, the obtained zinc oxide flotation and selection concentrate 1 enters zinc oxide flotation and selection operation 2, and the obtained selection tailings 1 are returned to the zinc oxide flotation and selection operation 2; S8, zinc oxide flotation and selection operation II: adding activating agent sodium sulfide to the zinc oxide flotation and selection concentrate I obtained in step S7, and then performing zinc oxide flotation and selection operation II, the obtained zinc oxide selection concentrate II is the zinc oxide concentrate, and the obtained selection tailings II are returned to the zinc oxide flotation and selection operation I.

2. The method according to claim 1, characterized in that In step S1, the raw ore is crushed to less than 2 mm, and then mixed with water in a mass ratio of 2:1 and fed into a mill for grinding, and the ore is ground until the product fineness is -0.3 mm, accounting for 60%.

3. The method according to claim 1, characterized in that In step S2, the magnetic field strength of each level of zinc oxide strong magnetic roughing operation is 1.35-1.75T, and the pulsation frequency is adjusted to 0-10 times / minute.

4. The method according to claim 1, characterized in that: In step S3, the high intensity magnetic separation roughing concentrates obtained from the high intensity magnetic separation roughing operations of zinc oxide at various levels are combined to adjust the pulp mass concentration to 60%-65%, and the fineness of the finely ground product is -0.074mm and the content accounts for 55%-60%.

5. The method according to claim 1, characterized in that In step S4, based on the dry weight of the raw ore per ton, the amount of sodium carbonate used is 1200g / t-1500g / t, the amount of water glass used is 1200g / t-1500g / t, the amount of sodium sulfide used is 2000-3000g / t, and the amount of dodecylamine used is 40g / t-60g / t.

6. The method according to claim 1, characterized in that In step S5, based on the dry weight of the raw ore per ton, the amount of sodium carbonate used is 500g / t-800g / t, the amount of water glass used is 500g / t-800g / t, the amount of sodium sulfide used is 500g / t-1000g / t, and the amount of dodecylamine used is 20g / t-30g / t.

7. The method according to claim 1, characterized in that In step S6, based on the dry weight of the raw ore per ton, the amount of sodium carbonate used is 100g / t-300g / t, the amount of water glass used is 100g / t-300g / t, the amount of sodium sulfide used is 200g / t-400g / t, and the amount of dodecylamine used is 10g / t-20g / t.

8. The method according to any one of claims 1, 5-7, characterized in that: In steps S4, S5 and S6, the stirring time after adding sodium carbonate, water glass, sodium sulfide and dodecylamine is 2 minutes, 2 minutes, 1 minute and 2 minutes respectively.

9. The method according to claim 1, characterized in that: In step S7, the amount of sodium sulfide used is 300 g / t-500 g / t per ton of dry weight of the raw ore, and the mixture is stirred for 1 minute after adding the sodium sulfide.

10. The method according to claim 1, characterized in that In step S8, the amount of sodium sulfide used is 100 g / t-200 g / t per ton of dry weight of the raw ore, and the mixture is stirred for 1 minute after adding the sodium sulfide.

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