A beneficiation method for high-mud oxidized lead-zinc ore using graded slurry adjustment and mixed hydrophobic floc carrier flotation

Abstract

The present invention discloses a beneficiation method for high-mud lead-zinc oxide ores using graded slurry mixing and mixed hydrophobic flocculant carrier flotation, comprising the following steps: 1) ore grinding; 2) sulfide ore flotation; 3) lead oxide flotation; 4) graded slurry mixing; and 6) zinc oxide flotation. This method is designed to recover zinc oxide minerals from high-mud, high-oxidation lead-zinc oxide ores by utilizing the surface hydrophobicity of coarse-grained and fine-grained minerals after separate slurry mixing to form hydrophobic floccules, thereby achieving comprehensive recovery. This method can overcome the effects of high-content muddy gangue, has strong adaptability, and achieves high zinc oxide concentrate grade and recovery rate, enabling efficient flotation recovery of such zinc resources.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing engineering, and in particular relates to a beneficiation method for high-muddy lead-zinc oxide ores using graded slurry adjustment-mixed hydrophobic floc carrier flotation. Background Art

[0002] As an important nonferrous metal resource, zinc plays an irreplaceable role in industries such as machinery, construction, electrical engineering, and medicine. Zinc sulfide minerals have long been the primary source of zinc resources. With the gradual depletion of high-grade, easily recyclable zinc sulfide mineral resources, the efficient recovery of zinc oxide minerals has become a pressing issue in zinc resource utilization.

[0003] Since zinc oxide ore is formed by the weathering of sulfide deposits, it is usually associated with fine-grained rock-forming minerals and contains a large amount of primary ore mud, such as clay, limonite, dolomite, and quartz. At the same time, due to the fine particle size of zinc oxide minerals when they are associated with gangue, fine grinding is required to obtain high-quality concentrate. Fine grinding inevitably leads to an increase in the amount of secondary ore mud, and the target mineral is also prone to over-crushing. The presence of a large amount of primary and secondary ore mud has a serious deterioration in the flotation recovery of zinc oxide minerals. The adsorption of ore mud on the surface of the target mineral leads to non-selective adsorption of reagents, resulting in low concentrate grade, low recovery rate, and high reagent consumption. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-mud oxidized lead-zinc ore beneficiation method using graded slurry adjustment-mixed hydrophobic floc carrier flotation.

[0005] The present invention provides a method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carriers, comprising the following steps:

[0006] 1) Crushing and grinding the raw ore to obtain grinding products;

[0007] 2) subjecting the ground product obtained in step 1) to sulfide ore flotation to obtain sulfide ore concentrate and sulfide ore tailings;

[0008] 3) subjecting the sulfide ore tailings obtained in step 2) to lead oxide flotation to obtain lead oxide concentrate and lead oxide tailings;

[0009] 4) Classifying the lead oxide tailings obtained in step 3) to obtain two products: a +0.038 mm particle size and a -0.038 mm particle size;

[0010] 5) Slurrying the +0.038 mm particle size product obtained in step 4) by sequentially adding 500-1500 g / t of sodium carbonate, 300-600 g / t of water glass, 3-8 kg / t of sodium sulfide, and 50-150 g / t of a collector to obtain a slurry-adjusted product 1;

[0011] 6) Slurrying the -0.038 mm particle size product obtained in step 4) by sequentially adding 1000-2000 g / t of sodium carbonate, 500-1500 g / t of water glass, 300-600 g / t of sodium hexametaphosphate, 10-20 kg / t of sodium sulfide, and 50-150 g / t of a collector to obtain a slurry-adjusted product 2;

[0012] 7) The slurry product 1 obtained in step 5) is mixed with the slurry product 2 obtained in step 6), stirred, and aerated to perform zinc oxide flotation to obtain zinc oxide concentrate and zinc oxide tailings.

[0013] Preferably, in step 1), the -0.074 mm particle size accounts for 80% to 90% of the ground product.

[0014] Preferably, in the step 2), the sulfide ore flotation is performed in a coarse and a scavenging manner, wherein the reagent system for the coarse flotation is to sequentially add 50-200 g / t of copper sulfate, 50-100 g / t of butyl xanthate, and 20-60 g / t of pine oil; and the reagent system for the scavenging flotation is to sequentially add 25-100 g / t of copper sulfate and 25-50 g / t of butyl xanthate.

[0015] More preferably, in the step 2), during the coarse and sweep process, stirring is performed for 5 to 10 minutes after the copper sulfate is added.

[0016] Preferably, in step 3), the lead oxide flotation is performed in a coarse flotation and a sweep flotation process, wherein the reagent system of the coarse flotation process is to sequentially add 500-2000 g / t of sodium carbonate, 1000-2000 g / t of water glass, 500-2000 g / t of sodium sulfide, 50-200 g / t of butyl xanthate, and 10-50 g / t of pine oil; and the reagent system of the sweep flotation process is to add 25-100 g / t of butyl xanthate.

[0017] More preferably, in step 3), the mixture is stirred for 5 to 10 minutes after the sodium sulfide is added.

[0018] Preferably, in steps 5) and 6), the collector is at least one of dodecylamine, hexadecylamine and octadecylamine.

[0019] Preferably, in steps 5) and 6), the mixture is stirred for 15 to 25 minutes after the sodium sulfide is added.

[0020] Preferably, in step 7), the zinc oxide flotation is one coarse flotation and two scavenging flotation steps, the reagent system for the first scavenging step is to add 50-100 g / t of collector, and the reagent system for the second scavenging step is to add 25-50 g / t of collector.

[0021] More preferably, the collector is at least one of dodecylamine, hexadecylamine and octadecylamine.

[0022] Beneficial effects of the present invention: The graded slurry adjustment-mixed hydrophobic floc carrier flotation method of the present invention has high adaptability for high-mud and high-oxidation-rate lead-zinc oxide ores, and can recover sulfide ore-lead oxide-zinc oxide separately without desludging, thereby reducing the negative effects of large-scale zinc metal loss caused by the commonly used desludging flotation. At the same time, it effectively prevents the adsorption of muddy minerals on the surface of coarse-grained zinc oxide, improves the selectivity of the reagent on the mineral surface, and greatly reduces the dosage of the reagent. In the zinc oxide flotation process, the material is divided into two particle size products of +0.038mm and -0.038mm by grading. For the coarse particle size, since there is no influence of fine particles and its specific surface area is small, only a smaller amount of sodium sulfide is needed to obtain a sulfide layer with the largest area and thickness on its surface. After adding the collector, it is adsorbed on the sulfide surface, thereby having a stronger hydrophobic ability. For the fine particle size, the dosage of the inhibitor water glass and sodium hexametaphosphate is increased to make it evenly dispersed. This also indirectly reduces the adverse effects on the coarse particle size caused by excessive inhibitor dosage. Under the action of sodium sulfide and collector, the surface of fine-grained minerals is sulfided and the collector is adsorbed. However, due to its fine particle size, the probability of collision with bubbles during flotation is low, and its small momentum determines that it is difficult to break through the hydration layer and adhere to the bubbles, resulting in an extremely low recovery rate; after the two particle sizes are mixed and stirred, the coarse and fine particles with the collector adsorbed on the surface form hydrophobic flocs due to hydrophobic attraction, and the fine particles agglomerate on their surface with the coarse particles as carriers, further increasing the apparent particle size of the target mineral and increasing the probability of collision and adhesion with bubbles, thereby achieving comprehensive recovery of the target mineral.

[0023] In summary, the present invention has the characteristics of reducing production costs, improving zinc oxide recovery rate, and having strong adaptability to zinc oxide ores with high mud and high oxidation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a process flow chart of the present invention.

[0025] Figure 2 This is the process flow chart of Example 1.

[0026] Figure 3 This is the process flow chart of Comparative Example 1.

[0027] Figure 4 This is the process flow chart of Comparative Example 2.

[0028] Figure 5 This is the process flow chart of Comparative Example 3.

[0029] Figure 6 This is the process flow chart of Comparative Example 4.

[0030] Figure 7 This is the process flow chart of Example 2.

[0031] Figure 8 This is the process flow chart of Example 3. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the embodiments of the present invention will be described in detail below to facilitate understanding by technicians.

[0033] Example 1

[0034] The Pb grade of a high-argillaceous lead-zinc ore is 1.07% and the Zn grade is 8.35%. The separation process is as follows: Figure 2 As shown, the specific flotation process includes the following steps:

[0035] 1) Crushing and grinding the raw ore, and obtaining a grinding product with a particle size of -0.074 mm accounting for 80%;

[0036] 2) performing sulfide ore flotation on the ground product obtained in step 1), sequentially adding 100 g / t of copper sulfate, 50 g / t of butyl xanthate, and 20 g / t of pine oil, performing roughing of the sulfide ore to obtain roughing foam and roughing tailings, sequentially adding 50 g / t of copper sulfate and 25 g / t of butyl xanthate to the roughing tailings, and then performing scavenging;

[0037] 3) To the sulfide ore flotation tailings product obtained in step 2), 500 g / t of sodium carbonate, 1500 g / t of water glass, 1000 g / t of sodium sulfide (stirring for 5 minutes), 80 g / t of butyl xanthate, and 10 g / t of pine oil were sequentially added to perform lead oxide roughing, and 40 g / t of butyl xanthate was added to the roughing tailings before scavenging;

[0038] 4) Classifying the lead oxide flotation product obtained in step 3) to obtain two products with a particle size of +0.038 mm and -0.038 mm;

[0039] 5) The product with a particle size of +0.038 mm obtained in step 4) was slurried by sequentially adding 1000 g / t of sodium carbonate, 500 g / t of water glass, 5 kg / t of sodium sulfide (stirring for 20 minutes), and 100 g / t of dodecylamine;

[0040] 6) The -0.038 mm particle size product obtained in step 4) was slurried by sequentially adding 1000 g / t of sodium carbonate, 1000 g / t of water glass, 500 g / t of sodium hexametaphosphate, 15 kg / t of sodium sulfide (stirring for 20 min), and 100 g / t of dodecylamine;

[0041] 7) The slurry products obtained in step 5) and step 6) were mixed, stirred for 3 minutes, and then aerated flotation was performed to obtain a zinc oxide coarse concentrate. 50 g / t and 25 g / t of dodecylamine were added to the rougher tailings to perform scavenging I and scavenging II, respectively.

[0042] The final flotation test results obtained using the graded slurry adjustment-mixed hydrophobic floc carrier flotation method are shown in Table 1. The Zn grade in the zinc oxide concentrate is 23.13% and the Zn recovery rate is 65.11%.

[0043] Table 1 Flotation separation test results / %

[0044]

[0045] Comparative Example 1

[0046] The ore beneficiation test was carried out on the ore described in Example 1 by direct flotation method. The beneficiation process is as follows: Figure 3 Table 2 shows the final flotation test results.

[0047] Table 2 Direct flotation test results / %

[0048]

[0049] The final flotation test results obtained using the direct flotation method showed that the Zn grade in the zinc oxide concentrate was 13.37% and the Zn recovery rate was 36.86%.

[0050] Comparative Example 2

[0051] The desludging flotation method was used to conduct a mineral processing test on the ore described in Example 1. The separation process is as follows: Figure 4 Table 3 shows the final flotation test results.

[0052] Table 3 Desliming flotation test results / %

[0053]

[0054] The final flotation test results obtained using the desliming flotation method showed that the Zn grade in the zinc oxide concentrate was 20.54% and the Zn recovery rate was 52.82%.

[0055] Comparative Example 3

[0056] The ore beneficiation test was carried out on the ore described in Example 1 by using the graded flotation method. The beneficiation process is as follows: Figure 5 Table 4 shows the final flotation test results.

[0057] Table 4 Test results of graded flotation method / %

[0058]

[0059] The final flotation test results obtained using the graded flotation method showed that the Zn grade in the coarse-zinc oxide concentrate was 19.25%, the Zn recovery rate was 33.81%, the Zn grade in the fine-zinc oxide concentrate was 11.23%, the Zn recovery rate was 20.94%, and the Zn grade in the total zinc oxide concentrate was 15.12%, the Zn recovery rate was 54.75%.

[0060] Comparative Example 4

[0061] The ore beneficiation test of Example 1 was carried out by using the graded sulfidation-mixed flotation method. The beneficiation process is as follows: Figure 6 Table 5 shows the final flotation test results.

[0062] Table 5 Test results of graded sulfidation-mixed flotation method / %

[0063]

[0064] In the final flotation test results obtained using the graded sulfide-mixed flotation method, the Zn grade in the zinc oxide concentrate was 22.08% and the Zn recovery rate was 49.20%.

[0065] Example 2

[0066] This example uses a high-argillaceous lead-zinc oxide ore sample as the sample, in which the Pb grade is 1.28% and the Zn grade is 7.23%. The flotation process in this example is exactly the same as that in Example 1, with the differences being the grinding fineness of the ore sample, the type and dosage of the reagent, the action time, etc., in which octadecylamine is used as the collector for the zinc oxide ore, as shown in the following figure. Figure 7 As shown in Table 6, the final flotation test results show that the Zn grade in the zinc oxide concentrate is 21.66% and the Zn recovery rate is 66.31%.

[0067] Table 6 Flotation test results / %

[0068]

[0069] Example 3

[0070] The ore sample used in this embodiment is the ore sample described in Example 2. The flotation process in this embodiment is the same as that in Example 1 and Example 2. The differences are in the ore grinding fineness, the type and dosage of the reagent, the action time, etc., wherein a mixed amine is used as a zinc oxide ore collector. The mixed amine is a mixture of dodecylamine, hexadecylamine, and octadecylamine in a mass ratio of 1:1:1. For details, see Figure 8 As shown in Table 7, the final flotation test results show that the Zn grade in the zinc oxide concentrate is 22.13% and the Zn recovery rate is 66.33%.

[0071] Table 7 Flotation test results / %

[0072]

Claims

1. A method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carriers, comprising the following steps: 1) Crushing and grinding the raw ore to obtain grinding products; 2) subjecting the ground product obtained in step 1) to sulfide ore flotation to obtain sulfide ore concentrate and sulfide ore tailings; 3) subjecting the sulfide ore tailings obtained in step 2) to lead oxide flotation to obtain lead oxide concentrate and lead oxide tailings; 4) Classifying the lead oxide tailings obtained in step 3) to obtain two products: a +0.038 mm particle size and a -0.038 mm particle size; 5) Slurrying the +0.038 mm particle size product obtained in step 4) by sequentially adding 500-1500 g / t of sodium carbonate, 300-600 g / t of water glass, 3-8 kg / t of sodium sulfide, and 50-150 g / t of a collector to obtain a slurry-adjusted product 1; 6) Slurrying the -0.038 mm particle size product obtained in step 4) by sequentially adding 1000-2000 g / t of sodium carbonate, 500-1500 g / t of water glass, 300-600 g / t of sodium hexametaphosphate, 10-20 kg / t of sodium sulfide, and 50-150 g / t of a collector to obtain a slurry-adjusted product 2; 7) The slurry product 1 obtained in step 5) is mixed with the slurry product 2 obtained in step 6), stirred, and aerated to perform zinc oxide flotation to obtain zinc oxide concentrate and zinc oxide tailings.

2. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 1, characterized in that: In the step 1), the -0.074 mm particle size accounts for 80% to 90% of the ground product.

3. The beneficiation method for high-argillaceous lead-zinc ore by graded slurry adjustment and mixed hydrophobic floc carrier flotation according to claim 1, characterized in that: In the step 2), the sulfide ore flotation is performed in a coarse and a scavenging manner, wherein the reagent system for the coarse flotation is to sequentially add 50-200 g / t of copper sulfate, 50-100 g / t of butyl xanthate, and 20-60 g / t of pine oil; and the reagent system for the scavenging flotation is to sequentially add 25-100 g / t of copper sulfate and 25-50 g / t of butyl xanthate.

4. The beneficiation method for high-argillaceous lead-zinc ore by graded slurry adjustment and mixed hydrophobic flocculent carrier flotation according to claim 3, characterized in that: In the step 2), during the coarse and sweep process, the copper sulfate is added and stirred for 5 to 10 minutes.

5. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 1, characterized in that: In the step 3), the lead oxide flotation is performed in a coarse flotation and a sweep flotation process. The reagent system for the coarse flotation process is to sequentially add 500-2000 g / t of sodium carbonate, 1000-2000 g / t of water glass, 500-2000 g / t of sodium sulfide, 50-200 g / t of butyl xanthate, and 10-50 g / t of pine oil; the reagent system for the sweep flotation process is to add 25-100 g / t of butyl xanthate.

6. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 5, characterized in that: In the step 3), the mixture is stirred for 5 to 10 minutes after the sodium sulfide is added.

7. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 1, characterized in that: In the steps 5) and 6), the collector is at least one of dodecylamine, hexadecylamine and octadecylamine.

8. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 1, characterized in that: In the steps 5) and 6), the mixture is stirred for 15 to 25 minutes after the sodium sulfide is added.

9. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 1, characterized in that: In the step 7), the zinc oxide flotation is one coarse and two sweeps, the reagent system for the first sweep is to add 50-100 g / t of collector, and the reagent system for the second sweep is to add 25-50 g / t of collector.

10. The method for beneficiating high-argillaceous lead-zinc ore by flotation with graded slurry adjustment and mixed hydrophobic flocculent carrier according to claim 9, characterized in that: The collector is at least one of dodecylamine, hexadecylamine and octadecylamine.

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