Flotation recovery method for whole-fraction copper ore

Abstract

The flotation recovery method comprises the following steps: carrying out ore grinding and dissociation treatment on raw copper ore, then carrying out roughing, and grading roughing tailings to obtain three-fraction ore pulp products of + 200 meshes, 200-400 meshes and-400 meshes; the + 200-mesh ore pulp product is subjected to coarse grain flotation, a combined collecting agent of disulfide diisopropyl xanthate and isopropyl xanthate is adopted for recycling coarse grain copper minerals, and obtained rough concentrate is returned to the ore grinding operation; carrying out fine particle flotation on the ore pulp product with the size of-400 meshes by adopting a fine particle flotation collecting agent, and combining obtained rough concentrate with copper roughing rough concentrate for concentration; ore pulp products of 200-400 meshes are directly used as tailings. According to the method, the lost coarse and fine copper minerals in the ore pulp can be intensively recovered, and the copper flotation recovery rate can be increased.

Description

Technical Field

[0001] The invention relates to a flotation recovery method for full-grain-grade copper ore, belonging to the technical field of copper ore separation. Background Art

[0002] As a strategic metal resource, copper is widely used in new energy, construction, transportation, electronics and other fields. Copper sulfide ore is the main source of copper resources. At present, the priority flotation process is mainly used for copper sulfide ore. In the flotation process, lime and other inhibitors are added to inhibit pyrite, and collectors such as Z-200 and butyl xanthate are used to selectively float copper sulfide minerals. However, in the actual production process, due to the large processing volume, the ore is prone to form the problem of "big at both ends and small in the middle" during the grinding process, that is, the +200 mesh and -400 mesh particle sizes account for a large proportion, and the 200-400 mesh particle size accounts for a small proportion. Since the traditional flotation process mainly recovers minerals with a particle size of 200-400 mesh, the recovery of coarse and fine-grained minerals is easily ignored in process design, equipment selection, and reagent system setting. As a result, a large amount of coarse and fine copper minerals are lost in the tailings during the flotation process, resulting in serious resource losses.

[0003] Therefore, it is urgent to invent an efficient copper ore flotation process and reagent system for full-size recovery to ensure the efficient recovery and utilization of copper resources. Summary of the invention

[0004] In view of the problem of loss of coarse and fine copper minerals in the existing copper ore flotation recovery method, the purpose of the present invention is to provide a flotation recovery method for full-grained copper ore. After the copper ore is graded, different collector combinations are used for coarse and fine particles, thereby strengthening the recovery of coarse and fine-grained copper minerals and achieving full-grained flotation recovery of copper ore. In addition, for coarse-grained copper ore, the synergistic effect of diisopropyl xanthate disulfide and isopropyl xanthate significantly improves the adhesion between coarse copper particles and bubbles.

[0005] In order to achieve the above technical purpose, the present invention provides a flotation recovery method for full-size copper ore, which comprises the following steps:

[0006] 1) grinding and dissociating the copper ore, and then adding a flotation agent to carry out flotation, wherein the flotation includes a roughing process to obtain a copper concentrate and a copper tailings;

[0007] 2) The copper rough tailings are classified to obtain three-grade pulp products of +200 mesh, 200-400 mesh, and -400 mesh;

[0008] 3) adding diisopropyl xanthate disulfide and isopropyl xanthate combined collector to the +200 mesh pulp product for coarse particle flotation to obtain coarse particle flotation concentrate and coarse particle flotation tailings;

[0009] 4) The -400 mesh pulp product is subjected to fine flotation roughing, and a fine flotation collector is added during the flotation process. The obtained fine flotation roughing concentrate is combined with the copper roughing concentrate obtained in step 1, and a copper concentrate is obtained by blank selection; the fine flotation roughing tailings are scavenged to obtain fine flotation tailings;

[0010] 5) The 200-400 mesh pulp product, the coarse-grained flotation tailings obtained in step 3 and the fine-grained flotation tailings obtained in step 4 are combined as the final flotation tailings.

[0011] The technical solution of the present invention skillfully combines the copper ore classification treatment and the combined collector adapted to the copper ore pulp of different particle sizes, thereby realizing the full particle size recovery of the copper ore. Specifically, the present invention can recover most of the minerals of the conventional particle size of 200-400 mesh by first roughing the copper ore, and avoids the adverse effects on the subsequent fine particle size flotation and coarse particle size flotation process. Then, the copper minerals after the roughing are graded and recovered, wherein the copper mineral content of the 200-400 mesh particle size after the roughing is very low and can be directly treated as tailings, and the coarse particle size and fine particle size flotation technology are respectively used for the +200 mesh and -400 mesh particle sizes, thereby ensuring the efficient recovery of the easily floatable copper minerals and strengthening the recovery of the coarse and fine particle size copper minerals. Among them, the +200 mesh coarse particles adopt a combined collector of diisopropyl xanthate disulfide and isopropyl xanthate, which has a good collection effect. The collection principle is that the branched structure in the hydrophobic hydrocarbon chain of diisopropyl xanthate disulfide can form a chelating effect with bubbles, thereby improving the adhesion strength between coarse-grained copper minerals and bubbles; at the same time, the molecular structure contains two isopropyl xanthate groups. During the flotation process, the sulfur atoms in the diisopropyl xanthate molecules react chemically with the copper ions on the surface of the copper mineral to form copper sulfide compounds, thereby making the surface of the copper mineral hydrophobic, easy to attach to the bubbles and be brought to the surface of the pulp; and the isopropyl xanthate has a strong adsorption effect on the copper mineral particles, which further promotes the reaction between diisopropyl xanthate disulfide and bubbles. The synergistic use of the two can significantly improve the stable adhesion of bubbles in coarse-grained copper ore. As for the -400 mesh fine particles, the present invention uses long-chain xanthate to promote the interaction between fine copper minerals and collectors, improves the hydrophobicity of fine copper minerals, and combines neutral oil to improve the agglomeration of fine hydrophobic copper minerals in the oil phase or at the oil phase boundary, significantly improving the flotation efficiency of fine particles. Therefore, the special flotation separation reagent combination used in the present invention can effectively solve the problem that special flotation separation equipment must be used for copper ore coarse particles and copper ore fine particles in the prior art.

[0012] As a preferred solution, the coarse concentrate of the coarse particle flotation in step 3 is returned to the original ore grinding operation; the blank selection in step 4 is at least twice, and the scavenging is at least twice. In the present invention, most of the coarse concentrate after coarse particle flotation is conjoined, and needs to be returned to the original ore grinding for dissociation.

[0013] As a preferred solution, in step 1, the fineness of the product of the grinding and dissociation treatment is -74 μm, accounting for 50% to 75%, and the adjusting agent, collector I and frother are added in the roughing process of flotation to promote flotation. Further preferably, the fineness of the product of the grinding and dissociation treatment is -74 μm, accounting for 55% to 70%.

[0014] As a preferred solution, the adjusting agent is at least one of sodium hydroxide, lime, sodium sulfide, sodium hydrosulfide, sodium pyrosulfite and sodium carbonate, and the amount used is to adjust the pH of the slurry to 7.5 to 9.5. In an alkaline environment, the collector I is more likely to react chemically with copper ions to form a stable complex, and the foaming property of the foaming agent is also relatively stable.

[0015] As a preferred solution, the collector I is at least one of xanthate, thiocarbamate, black drug and sulfur-nitrogen collectors, and the dosage is 10-100 g / t. The xanthate is preferably ethyl xanthate or butyl xanthate; the thiocarbamate is preferably Z-200 (ethyl thiocarbamate); the black drug is preferably butyl ammonium black drug; the sulfur-nitrogen is preferably ethyl thiocarbamate or ester 105 (thiocarbamate nitrile ester). A further preferred dosage is 20-60 g / t. The dosage of the reagents in the present invention is relative to the dosage of the original ore.

[0016] As a preferred solution, the foaming agent is at least one of No. 2 oil and MIBC, and the amount used is 5 to 30 g / t, and more preferably 10 to 20 g / t.

[0017] As a preferred solution, the classification adopts at least one of a high-frequency vibrating screen, a cyclone, a spiral classifier, a hydraulic classifier and a mud bucket.

[0018] As a preferred solution, the mass ratio of diisopropyl xanthate disulfide to isopropyl xanthate in the combined collector of diisopropyl xanthate disulfide and isopropyl xanthate is (3-1):1. Within the mass ratio range selected by the present invention, the best coarse particle flotation effect is achieved; if the dosage of diisopropyl xanthate disulfide is too high, it will lead to a greater loss of coarse particle copper minerals and a decrease in the recovery rate of copper concentrate; and when the dosage of isopropyl xanthate is too high, excessive isopropyl xanthate will cause it to be adsorbed on the surface of non-copper minerals in large quantities. This will reduce the selectivity of flotation, increase the impurity content in the product obtained by flotation, and reduce the grade of the concentrate. As a preferred solution, the total dosage of the combined collector of diisopropyl xanthate disulfide and isopropyl xanthate is 10-50 g / t.

[0019] As a preferred solution, the fine particle flotation collector is composed of a long-chain hydrocarbon-based xanthate and a neutral oil in a mass ratio of (1-2): (1-2). Within the mass ratio range selected by the present invention, the best fine particle flotation effect is achieved; if the dosage of the long-chain hydrocarbon-based xanthate is too high, the loss of fine particle copper minerals will increase and the recovery rate of copper concentrate will decrease; and if the dosage of the neutral oil is too high, some non-target minerals will be entrained into the oil phase or condensed at the oil phase boundary, thereby reducing the selectivity of flotation and lowering the grade of the concentrate.

[0020] As a preferred solution, the total amount of the fine particle flotation collector used in the roughing process is 20-50 g / t; the total amount of the fine particle flotation collector used in the scavenging process is 7-20 g / t; and the types of fine particle flotation collectors in the roughing process and the scavenging process are the same or different.

[0021] As a preferred solution, the long-chain hydrocarbon xanthate is at least one of butyl xanthate, pentyl xanthate and isoamyl xanthate; and the neutral oil is at least one of kerosene, diesel, transformer oil, lubricating oil and heavy oil.

[0022] As a preferred solution, in step 4, the pulp concentration in the roughing of fine-grained flotation is 20-30%, and the stirring rate of the flotation machine is 2000-2400rpm. In the process of fine-grained flotation of the present invention, the pulp concentration is low in order to reduce the mutual interference between particles, avoid the mutual inclusion of mineral fine particles affecting the flotation selectivity, and at the same time allow bubbles and mineral particles to have more contact opportunities, because the mineral particles in the dilute slurry are more dispersed, which is conducive to the collision and attachment of bubbles and single particles. A faster stirring rate can provide enough energy to break up the agglomerated fine-grained minerals, make the particles evenly dispersed, and increase the probability of contact with bubbles; it can accelerate the diffusion of reagents in the slurry, allowing the reagent molecules to quickly reach the surface of the mineral particles to act, which is very important for fine-grained minerals with large specific surface area; it can also disperse the air into more and smaller bubbles, increase the number and surface area of ​​bubbles, and the small bubbles rise slowly, which can prolong the action time with mineral particles and improve the flotation efficiency.

[0023] As a preferred solution, in step 3, the pulp concentration of the coarse particle flotation is 20-50%.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] First, the copper minerals are recovered in a graded manner, with conventional flotation methods used for copper minerals with a particle size of 200-400 mesh, and coarse-grained and fine-grained flotation technologies used for particle sizes of +200 mesh and -400 mesh, respectively. This not only ensures the efficient recovery of easily floatable copper minerals, but also strengthens the recovery of coarse-grained and fine-grained copper minerals, effectively improving the flotation recovery rate.

[0026] Secondly, the stable adhesion of particles and bubbles is particularly important during the coarse particle flotation process. The combined collector of diisopropyl xanthate disulfide + isopropyl xanthate is used. On the one hand, the branched structure in the hydrophobic hydrocarbon chain in the collector can form a chelating effect with the bubbles, thereby improving the adhesion strength between the coarse copper minerals and the bubbles; on the other hand, isopropyl xanthate has a strong effect on the copper mineral particles. The combination of the two achieves a synergistic effect, which promotes the stability and adhesion of the interaction between diisopropyl xanthate disulfide and the bubbles.

[0027] Third, a combination of long-chain xanthate and neutral oil collectors is used in the fine-particle flotation process. On the one hand, the long-chain xanthate can promote the interaction between fine-particle copper minerals and the collector, and improve the hydrophobicity of fine-particle copper minerals; on the other hand, the addition of neutral oil can achieve the agglomeration of fine-particle hydrophobic copper minerals in the oil phase or at the oil phase boundary, thereby promoting the fine-particle flotation efficiency.

[0028] Fourthly, the flotation process and reagent system are highly applicable and can relax the grinding fineness of the original ore, which is beneficial to ensuring production stability and reducing mineral processing costs.

[0029] Fifthly, the combination of the flotation separation method of the present invention and the reagent system can effectively solve the problem in the prior art that special flotation separation equipment must be used for coarse and fine copper ore particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a process flow chart of the closed-circuit test used in the embodiment of the present invention.

[0031] Figure 2 This is a process flow chart of the closed-circuit test used in Comparative Example 1. DETAILED DESCRIPTION

[0032] In order to further illustrate the present invention, the contents of the present invention are described in detail below in conjunction with the examples. However, it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. The protection scope of the present invention is not limited to the following examples.

[0033] The slurry concentration in the present invention refers to the mass concentration, and the amount of reagents used is the amount relative to the original ore.

[0034] Example 1

[0035] The copper content in the test raw material is 0.34wt%, and the process mineralogy research results show that the main metal minerals in the sample are pyrite and chalcopyrite. A small-scale closed-circuit laboratory test is carried out on the ore sample using a flotation process and reagent system for copper ore provided by the present invention. The specific steps of the test are as follows:

[0036] 1) Firstly, the ore sample is ground to a fineness of -74 μm accounting for 60%, and then lime is added as a regulator to adjust the pH value of the ore pulp to 8.5; then, 40 g / t of Z-200 as a collector and 10 g / t of No. 2 oil as a frother are added to perform copper roughing to obtain copper rough concentrate and copper rough tailings.

[0037] 2) The copper rough tailings obtained in step 1) are classified by a high-frequency vibrating screen to obtain three-grade ore pulp products of +200 mesh, 200-400 mesh, and -400 mesh.

[0038] 3) The +200 mesh pulp product (pulp concentration of 30%) obtained in step 2) is subjected to coarse particle flotation, and a collector of diisopropyl xanthate disulfide + isopropyl xanthate with a mass ratio of 2:1 is used as a collector, and the dosage is 20 g / t to obtain a coarse particle flotation concentrate and a coarse particle flotation tailings, and the coarse particle flotation concentrate is returned to the original ore grinding operation.

[0039] 4) The -400 mesh pulp product obtained in step 2) is subjected to fine-grained flotation roughing, and a collector is a combination of butyl xanthate + diesel with a mass ratio of 1:1, and the dosage is 30g / t. The pulp concentration during the flotation process is 25%, and the stirring speed of the flotation machine is 2300rpm. Fine-grained flotation rough concentrate and fine-grained flotation rough tailings are obtained by roughing.

[0040] 5) The copper rough concentrate obtained in step 1) and the fine-grained flotation rough concentrate obtained in step 4) are combined, and blank concentration is performed twice to obtain copper concentrate.

[0041] 6) The fine-grained flotation coarse tailings obtained in step 4) are scavenged twice, and 15 g / t of a combined collector of butyric acid + diesel (mass ratio is 1:1) is added in the first scavenging, and 7 g / t of a combined collector of butyric acid + diesel (mass ratio is 1:1) is added in the second scavenging. The scavenged tailings are combined with the 200-400 mesh slurry product in step 2) and the coarse flotation tailings in step 3) to obtain the final flotation tailings.

[0042] The test results are shown in Table 1.

[0043] It can be seen from the test results that by adopting the flotation process and reagent system of a copper ore provided by the present invention, a small-scale closed-circuit test in a laboratory can obtain a copper concentrate with a copper grade of 22.36%, and a copper recovery rate of 87.26%.

[0044] Table 1

[0045]

[0046] Example 2

[0047] Other conditions are the same as those in Example 1, except that the fine particle flotation collector is butyl xanthate + pentyl xanthate + diesel in a mass ratio of 0.5:0.5:1.

[0048] The test results are shown in Table 2.

[0049] It can be seen from the test results that by adopting the flotation process and reagent system of a copper ore provided by the present invention, a small-scale closed-circuit test in a laboratory can obtain a copper concentrate with a copper grade of 21.58%, and a copper recovery rate of 88.10%.

[0050] Table 2

[0051]

[0052] Example 3

[0053] Other conditions are consistent with those in Example 1, except that the coarse particle flotation collector is a combined collector of diisopropyl xanthate disulfide + isopropyl xanthate in a mass ratio of 3:1.

[0054] The test results are shown in Table 3.

[0055] It can be seen from the test results that by adopting the flotation process and reagent system of a copper ore provided by the present invention, a small-scale closed-circuit test in a laboratory can obtain a copper concentrate with a copper grade of 22.25%, and a copper recovery rate of 87.12%.

[0056] Table 3

[0057]

[0058] Example 4

[0059] Other conditions were the same as those in Example 1, except that the fine particle flotation collector was a 1:1:1 combination of isoamyl xanthate + kerosene + transformer oil.

[0060] The test results are shown in Table 4.

[0061] It can be seen from the test results that by adopting the flotation process and reagent system of a copper ore provided by the present invention, a small-scale closed-circuit test in a laboratory can obtain a copper concentrate with a copper grade of 22.53%, and a copper recovery rate of 87.51%.

[0062] Table 4

[0063]

[0064] Example 5

[0065] The copper content in the test raw material is 0.50wt%, and the process mineralogy research results show that the main metal minerals in the sample are pyrite, chalcopyrite, bornite, and chalcocite. A small-scale closed-circuit laboratory test is carried out on the ore sample using a flotation process and reagent system for copper ore provided by the present invention. The specific steps of the test are as follows:

[0066] 1) First, the ore sample is ground to a fineness of -74 μm accounting for 65%, and sodium sulfide is added as a regulator after grinding to adjust the pH value of the slurry to 9.0; then, 50 g / t of a combined collector of ethyl xanthate + butyl ammonium black powder with a mass ratio of 1:1 and 10 g / t of MIBC are added as a foaming agent to perform copper roughing to obtain copper rough concentrate and copper rough tailings.

[0067] 2) The copper rough tailings obtained in step 1) are classified by a hydraulic classifier to obtain three-grade slurry products of +200 mesh, 200-400 mesh, and -400 mesh.

[0068] 3) The +200 mesh pulp product (pulp concentration of 35%) obtained in step 2) is subjected to coarse particle flotation, and a collector of diisopropyl xanthate disulfide + isopropyl xanthate with a mass ratio of 1:1 is used, and the dosage is 30 g / t to obtain a coarse particle flotation concentrate and a coarse particle flotation tailings, and the coarse particle flotation concentrate is returned to the original ore grinding operation.

[0069] 4) The -400 mesh pulp product obtained in step 2) is subjected to fine-grained flotation roughing, and a collector is a combination of amyl xanthate + heavy oil with a mass ratio of 2:1, and the dosage is 40g / t. The pulp concentration during the flotation process is 23%, and the stirring speed of the flotation machine is 2200rpm. Fine-grained flotation rough concentrate and fine-grained flotation rough tailings are obtained by roughing.

[0070] 5) The copper rough concentrate obtained in step 1) and the fine-grained flotation rough concentrate obtained in step 4) are combined, and blank concentration is performed twice to obtain copper concentrate.

[0071] 6) The fine-grained flotation coarse tailings obtained in step 4) are scavenged twice, and 20 g / t of a combined collector of butyric acid xanthate + diesel (mass ratio is 1:1) is added in the first scavenging, and 10 g / t of a combined collector of butyric acid xanthate + diesel (mass ratio is 1:1) is added in the second scavenging. The scavenged tailings are combined with the 200-400 mesh slurry product in step 2) and the coarse-grained flotation tailings in step 3) to obtain the final flotation tailings.

[0072] The test results are shown in Table 5.

[0073] It can be seen from the test results that by adopting the flotation process and reagent system of a copper ore provided by the present invention, a small-scale closed-circuit test in a laboratory can obtain a copper concentrate with a copper grade of 24.52%, and a copper recovery rate of 88.11%.

[0074] Table 5

[0075]

[0076] Comparative Example 1

[0077] The test materials are the same as those in Example 1, except that a non-classified flotation process is used to conduct a small-scale closed-circuit test in the laboratory. The specific steps of the test are as follows:

[0078] 1) Firstly, the ore sample is ground to a fineness of -74 μm accounting for 60%, and then lime is added as a regulator to adjust the pH value of the ore pulp to 8.5; then, 40 g / t of Z-200 as a collector and 10 g / t of No. 2 oil as a frother are added to perform copper roughing to obtain copper rough concentrate and copper rough tailings.

[0079] 2) The copper rough tailings obtained in step 1) are scavenged twice, 20 g / t of Z-200 is added in the first scavenging, and 10 g / t of Z-200 is added in the second scavenging. The scavenged tailings are the final flotation tailings.

[0080] 3) The copper rough concentrate obtained in step 1) is blank-benefited twice to obtain copper concentrate.

[0081] The test results are shown in Table 6.

[0082] It can be seen from the test results that after adopting the conventional process flow, the laboratory small closed-circuit test can obtain a copper concentrate with a copper grade of 22.17% and a copper recovery rate of 83.94%. Comparing the flotation process and reagent system of a copper mine provided by the present invention, it is found that the copper concentrate recovery rate has dropped significantly after the coarse and fine particle flotation process and reagent are cancelled.

[0083] Table 6

[0084]

[0085] Comparative Example 2

[0086] The other conditions were the same as those in Example 1, except that the coarse particle flotation collector was isopropyl xanthate.

[0087] The test results are shown in Table 7.

[0088] From the test results, it can be seen that after removing diisopropyl xanthate disulfide from the coarse particle flotation collector, the laboratory small closed-circuit test can obtain a copper concentrate with a copper grade of 22.55% and a copper recovery rate of 85.84%. By comparison, it was found that after removing the addition of diisopropyl xanthate disulfide, the loss of coarse particle copper minerals increased and the copper concentrate recovery rate decreased by 1.42 percentage points.

[0089] Table 7

[0090]

[0091] Comparative Example 3

[0092] The other conditions were the same as those in Example 1, except that the coarse particle flotation collector was diisopropyl xanthate disulfide.

[0093] The test results are shown in Table 8.

[0094] From the test results, it can be seen that after removing the isopropyl xanthate from the coarse particle flotation collector, the laboratory small closed-circuit test can obtain a copper concentrate with a copper grade of 21.88% and a copper recovery rate of 85.60%. By comparison, it was found that after the addition of isopropyl xanthate was removed, the loss of coarse particle copper minerals increased and the recovery rate of copper concentrate decreased by 1.66 percentage points.

[0095] Table 8

[0096]

[0097] Comparative Example 4

[0098] The other conditions were the same as those in Example 1, except that the fine particle flotation collector was butyrate.

[0099] The test results are shown in Table 9.

[0100] From the test results, it can be seen that after removing diesel from the fine-grained flotation collector, the laboratory small closed-circuit test can obtain copper concentrate with a copper grade of 22.63% and a copper recovery rate of 85.63%. By comparison, it was found that after the removal of diesel addition, the loss of fine-grained copper minerals increased and the copper concentrate recovery rate decreased by 1.63 percentage points.

[0101] Table 9

[0102]

[0103] Comparative Example 5

[0104] The other conditions were the same as those in Example 1, except that the fine particle flotation collector was diesel.

[0105] The test results are shown in Table 10.

[0106] From the test results, it can be seen that after removing the butyl xanthate from the fine-grained flotation collector, the laboratory small closed-circuit test can obtain a copper concentrate with a copper grade of 22.98% and a copper recovery rate of 84.94%. By comparison, it was found that after the addition of butyl xanthate was removed, the loss of fine-grained copper minerals increased and the recovery rate of copper concentrate decreased by 2.32 percentage points.

[0107] Table 10

[0108]

[0109] Comparative Example 6

[0110] The other conditions are the same as those in Example 1, except that the coarse particle flotation collector is a combined collector of diisopropyl xanthate disulfide + isopropyl xanthate in a mass ratio of 4:1.

[0111] The test results are shown in Table 11.

[0112] From the test results, it can be seen that after the mass ratio of diisopropyl xanthate disulfide to isopropyl xanthate in the coarse-grained flotation collector was changed to 4:1, the laboratory small closed-circuit test could obtain a copper concentrate with a copper grade of 22.26% and a copper recovery rate of 86.28%. By comparison, it was found that the change in the mass ratio of diisopropyl xanthate disulfide to isopropyl xanthate in the coarse-grained flotation collector led to a greater loss of coarse-grained copper minerals, and the recovery rate of copper concentrate decreased by 0.98 percentage points.

[0113] Table 11

[0114]

[0115] Comparative Example 7

[0116] The other conditions are the same as those in Example 1, except that the fine particle flotation collector is a combination collector of butyrate and diesel in a mass ratio of 3:1.

[0117] The test results are shown in Table 12.

[0118] From the test results, it can be seen that after the mass ratio of butyl xanthate to diesel in fine-grained flotation collector was changed to 3:1, the laboratory small closed-circuit test could obtain copper concentrate with a copper grade of 22.07% and a copper recovery rate of 86.11%. By comparison, it was found that the change in the mass ratio of butyl xanthate to diesel in fine-grained flotation collector led to a greater loss of fine-grained copper minerals, and the recovery rate of copper concentrate decreased by 1.15 percentage points.

[0119] Table 12

[0120]

Claims

1. A flotation recovery method for full-size copper ore, characterized in that: The following steps are involved: 1) grinding and dissociating the copper ore, and then adding a flotation agent to carry out flotation, wherein the flotation includes a roughing process to obtain a copper concentrate and a copper tailings; 2) The copper rough tailings are classified to obtain three-grade pulp products of +200 mesh, 200-400 mesh, and -400 mesh; 3) adding diisopropyl xanthate disulfide and isopropyl xanthate combined collector to the +200 mesh pulp product for coarse particle flotation to obtain coarse particle flotation concentrate and coarse particle flotation tailings; 4) The -400 mesh pulp product is subjected to fine flotation roughing, and a fine flotation collector is added during the flotation process. The obtained fine flotation roughing concentrate is combined with the copper roughing concentrate obtained in step 1, and a copper concentrate is obtained by blank selection; the fine flotation roughing tailings are scavenged to obtain fine flotation tailings; 5) The 200-400 mesh pulp product, the coarse-grained flotation tailings obtained in step 3 and the fine-grained flotation tailings obtained in step 4 are combined as the final flotation tailings.

2. The flotation recovery method of a full-size copper ore according to claim 1, characterized in that: In step 1, the product fineness of the grinding and dissociation treatment is -74 μm, accounting for 50% to 75%. During the roughing process of flotation, a regulator, a collector I and a frother are added to promote flotation.

3. The flotation recovery method of a full-size copper ore according to claim 2, characterized in that: The adjusting agent is at least one of sodium hydroxide, lime, sodium sulfide, sodium hydrosulfide, sodium pyrosulfite and sodium carbonate, and the amount used is to adjust the pH of the slurry to 7.5-9.5; The collector I is at least one of xanthate, thiocarbamide, black medicine and sulfur-nitrogen collectors, and the amount used is 10-100 g / t; The foaming agent is at least one of No. 2 oil and MIBC, and the dosage is 5 to 30 g / t.

4. A flotation recovery method for full-size copper ore according to any one of claims 1 to 3, characterized in that: The classification adopts at least one of a high-frequency vibrating screen, a cyclone, a spiral classifier, a hydraulic classifier and a mud bucket.

5. The flotation recovery method of a full-size copper ore according to claim 4, characterized in that: The mass ratio of diisopropyl xanthate disulfide to isopropyl xanthate in the combined collector of diisopropyl xanthate disulfide and isopropyl xanthate is (3-1):

1.

6. The flotation recovery method of a full-size copper ore according to claim 5, characterized in that: The total dosage of the diisopropyl xanthate disulfide and isopropyl xanthate combined collector is 10-50 g / t.

7. The flotation recovery method of a full-size copper ore according to claim 1, characterized in that: The fine particle flotation collector is composed of long-chain hydrocarbon-based xanthate and neutral oil in a mass ratio of (1-2): (1-2).

8. The flotation recovery method of a full-size copper ore according to claim 7, characterized in that: The total amount of the fine particle flotation collector used in the roughing process is 20-50 g / t; the total amount of the fine particle flotation collector used in the scavenging process is 7-20 g / t; and the types of fine particle flotation collectors in the roughing process and the scavenging process are the same or different.

9. The flotation recovery method of full-size copper ore according to claim 7, characterized in that: The long-chain hydrocarbon-based xanthate is at least one of butyl xanthate, pentyl xanthate and isoamyl xanthate; the neutral oil is at least one of kerosene, diesel, transformer oil, lubricating oil and heavy oil.

10. The flotation recovery method of full-size copper ore according to claim 1, characterized in that: In step 4, the pulp concentration in the fine particle flotation roughing is 20-30%, and the stirring speed of the flotation machine is 2000-2400 rpm; In step 3, the pulp concentration of the coarse particle flotation is 20-50%.

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