A combined inhibitor and its application in the flotation of fine-grained copper oxide ore

Abstract

The present application relates to a kind of combination inhibitor and its application in micro fine particle copper oxide ore flotation, belong to mineral processing technical field.The combination inhibitor used in the present application is composed of amino triacetic acid, lactic acid, tannin extract and polymeric ferric sulfate, can produce synergies with sulfidizing agent and collector cooperation, target regulation mineral surface property and ore pulp environment.The combination inhibitor of the present application can eliminate the inevitable metal ion homogenization effect on mineral surface, selectively adsorbed on gangue mineral surface to reduce its reaction activity with sulfidizing agent and collector, thereby increasing the hydrophobicity difference between oxidized copper mineral and gangue mineral surface, while effectively trapping micro fine particle mineral in ore pulp solution to improve separation index and filtration efficiency.The present application economically and efficiently solves the technical problems such as gangue mineral difficult to inhibit in micro fine particle oxidized copper ore flotation process, interaction between minerals, low recovery rate of oxidized copper mineral, and mineral processing product difficult to filter.

Description

Technical Field

[0001] This invention relates to a combined inhibitor and its application in the flotation of fine-grained oxidized copper ore, belonging to the field of mineral processing technology. Background Technology

[0002] Copper ore is a non-renewable strategic mineral resource. With the gradual depletion of high-grade, easily beneficiated sulfide copper ores, the efficient separation and enrichment of oxidized copper ores has become a crucial way to supplement the shortage of copper raw materials. Fine-grained oxidized copper ores are a type of copper-bearing resource that is difficult to process. They have complex ore structures and compositions, finely distributed copper minerals, high soluble salt content, and often severe mudification, making recovery difficult. These ores often contain high levels of calcium and magnesium carbonate minerals. During ore grinding, agitation, and flotation, many metal ions dissolve, and these ions interact with the surface of the oxidized copper minerals, leading to severe homogenization between the oxidized copper minerals and gangue minerals. Conventional flotation reagents are insufficient for effective separation. Furthermore, the gangue minerals in fine-grained oxidized copper ores are diverse and complex, and conventional flotation reagents are difficult to effectively suppress them, resulting in poor-quality copper concentrate. Meanwhile, the high mud content in fine-grained copper oxide ore makes it difficult for fine particles in the flotation slurry to settle quickly, and makes it difficult to filter concentrate and tailings, resulting in a production process that is not smooth.

[0003] Therefore, there is an urgent need to develop efficient inhibitors to regulate the flotation interface and pulp solution environment, thereby improving the separation and enrichment of fine-grained copper oxide ores. Summary of the Invention

[0004] To address the technical challenges in the flotation of fine-grained copper oxide ores, such as the difficulty in suppressing gangue minerals, the interaction between minerals, the low recovery rate of copper oxide minerals, and the difficulty in filtering beneficiated products, this invention provides a combined inhibitor and its application in the flotation of fine-grained copper oxide ores. Specifically, by adding a combined inhibitor, the homogenization effect of unavoidable metal ions on the mineral surface is eliminated, and the inhibitor is selectively adsorbed on the surface of gangue minerals to reduce their reactivity with sulfiding agents and collectors. This increases the difference in hydrophobicity between the surfaces of copper oxide minerals and gangue minerals, while effectively capturing fine-grained minerals in the slurry solution to improve separation indicators and filtration efficiency.

[0005] A combination inhibitor is composed of aminotriacetic acid, lactic acid, tannin, and polyferric sulfate. Based on 100 parts by mass of the combination inhibitor, aminotriacetic acid comprises 15-25 parts, lactic acid comprises 25-35 parts, tannin comprises 35-45 parts, and polyferric sulfate comprises 5-15 parts.

[0006] The specific steps for applying the combined inhibitor in the flotation of fine-grained oxidized copper ore are as follows:

[0007] (1) The fine-grained copper oxide ore is crushed and ground to fully dissociate the copper oxide minerals in the ore, and water is added to adjust the slurry to a mass percentage concentration of 25-35%.

[0008] (2) Add a combination of inhibitor, activator, collector and frother to the slurry obtained in step (1) in sequence, and carry out roughing operation to obtain roughing concentrate and roughing tailings;

[0009] (3) Add a combination inhibitor, activator, collector and frother to the roughing tailings obtained in step (2) in sequence, and perform a scavenging operation to obtain a scavenging concentrate and a scavenging tailings; the scavenging concentrate is returned to the pulping and incorporated into the roughing operation in step (2);

[0010] (4) Add a combination inhibitor, activator, collector and frother to the tailings obtained in step (3) in sequence, and perform a second scavenging operation to obtain a second scavenging concentrate and a second scavenging tailings; the second scavenging concentrate is returned to the slurry and incorporated into the first scavenging operation in step (3); the second scavenging tailings are flotation tailings;

[0011] (5) Add a combination inhibitor and a collector to the rough concentrate obtained in step (2) in sequence, and perform a first cleaning operation to obtain a first cleaning concentrate and a first cleaning tailings; the first cleaning tailings are returned to the pulp conditioning and incorporated into the roughing operation in step (2);

[0012] (6) Add a collector to the primary concentrate obtained in step (5) and perform secondary cleaning to obtain secondary concentrate and secondary tailings; return the secondary tailings to the pulping and incorporate them into the primary cleaning operation in step (5); the secondary concentrate is a copper concentrate product.

[0013] Preferably, the activator is a mixture of ammonium sulfate, ethylenediamine phosphate, and sodium sulfide, wherein, based on 100 parts by mass of the activator, ammonium sulfate comprises 30-40 parts, ethylenediamine phosphate comprises 10-20 parts, and sodium sulfide comprises 45-55 parts; the collector is a mixture of isoamyl xanthate and butylammonium black powder, wherein, based on 100 parts by mass of the collector, isoamyl xanthate comprises 75-85 parts, and butylammonium black powder comprises 15-25 parts; and the foaming agent is pine oil.

[0014] Preferably, the copper content in the fine-grained copper oxide ore of step (1) is 0.5% to 1.7% by mass.

[0015] For every ton of fine-grained copper oxide ore, 700-1300g of combined inhibitor, 1600-2400g of activator, 350-750g of collector and 30-70g of frother are added to the slurry of the roughing operation in step (2).

[0016] For each ton of fine-grained copper oxide ore, 350-650g of combined inhibitor, 800-1200g of activator, 175-375g of collector and 15-35g of frother are added to the slurry of the first scavenging operation in step (3).

[0017] For every ton of fine-grained copper oxide ore, 175-325g of combined inhibitor, 200-300g of activator, 50-100g of collector and 10-20g of frother are added to the slurry of the secondary scavenging operation in step (4).

[0018] For every ton of fine-grained copper oxide ore, 175-325g of combined inhibitor and 70-150g of collector are added to the slurry of the first fine-refinement operation in step (5).

[0019] For every ton of fine-grained copper oxide ore, 35-75g of collector is added to the slurry in the secondary beneficiation operation of step (6).

[0020] The beneficial effects of this invention are:

[0021] (1) The combined inhibitor of the present invention can not only interact with metal ions in the flotation pulp solution of copper oxide ore, but also decompose metal ions adsorbed on the surface of minerals, thereby encapsulating metal ions into the interior of chelating groups and forming stable compounds, thereby eliminating the non-selective activation or inhibition of copper oxide minerals and gangue minerals by inevitable metal ions, avoiding homogenization between minerals, and facilitating the selective adsorption of subsequent flotation reagents.

[0022] (2) In the combined inhibitor of the present invention, lactic acid can be selectively adsorbed on the surface of quartz and silicate minerals, and tannin is adsorbed on the surface of carbonate minerals through chemical bonding and hydrogen bonding to generate a hydrophilic film, thereby achieving selective enhancement and inhibition of gangue minerals in copper oxide ore, reducing the adsorption of sulfiding agents and collectors on the surface of gangue minerals, increasing the hydrophobicity difference between the surfaces of copper oxide minerals and gangue minerals, and improving the sorting effect.

[0023] (3) The combined inhibitor of the present invention can capture fine mineral particles in the slurry solution, selectively regulate the occurrence form and structural characteristics of the slime through charge neutralization and bridging adsorption, effectively avoid the vicious cycle of slime in the flotation process, improve the filtration efficiency of concentrate and tailings, reduce the content of impurities in circulating water, and avoid affecting the mineral processing production indicators.

[0024] (4) The combined inhibitor used in this invention is green and non-toxic, has a simple preparation process, stable properties, is easy to use and highly operable. At the same time, when used in conjunction with sulfiding agents and collectors, it can produce a synergistic effect, target and regulate the surface properties of minerals and the pulp environment, and economically and efficiently solve the technical problems of gangue minerals being difficult to suppress, the interaction between minerals, and the low recovery rate of copper oxide minerals in the flotation process of fine-grained copper oxide ore. Attached Figure Description

[0025] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0027] In the following embodiments of the present invention, the combined inhibitor is a mixture of aminotriacetic acid, lactic acid, tannin and polyferric sulfate, the activator is a mixture of ammonium sulfate, ethylenediamine phosphate and sodium sulfide, the collector is a mixture of isoamyl xanthate and butylammonium black powder, and the foaming agent is pine oil.

[0028] Example 1: In this example, based on 100 parts by weight of the combined inhibitor, there are 15 parts of aminotriacetic acid, 35 parts of lactic acid, 35 parts of tannin, and 15 parts of polyferric sulfate; based on 100 parts by weight of the activator, there are 35 parts of ammonium sulfate, 20 parts of ethylenediamine phosphate, and 45 parts of sodium sulfide; based on 100 parts by weight of the collector, there are 75 parts of isoamyl xanthate and 25 parts of butylammonium black powder.

[0029] The method for applying the combined inhibitor in the flotation of fine-grained copper oxide ore (see...) Figure 1 The specific steps are as follows:

[0030] (1) The fine-grained copper oxide ore is crushed and ground to fully dissociate the copper oxide minerals in the ore. Water is added to adjust the slurry to a slurry mass percentage concentration of 25%, wherein the copper mass percentage content in the fine-grained copper oxide ore is 0.5%.

[0031] (2) Add the combined inhibitor, activator, collector and frother to the slurry obtained in step (1) in sequence, and carry out roughing operation to obtain roughing concentrate and roughing tailings; based on each ton of fine-grained copper oxide ore, add 700g of combined inhibitor, 1600g of activator, 350g of collector and 30g of frother to the slurry of the roughing operation.

[0032] (3) Add a combination inhibitor, activator, collector and frother to the roughing tailings obtained in step (2) in sequence, and perform a scavenging operation to obtain a scavenging concentrate and a scavenging tailings; the scavenging concentrate is returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 350g of combination inhibitor, 800g of activator, 175g of collector and 15g of frother to the slurry of the scavenging operation;

[0033] (4) Add a combination inhibitor, activator, collector and frother to the tailings obtained in step (3) in sequence, and perform a second scavenging operation to obtain a second scavenging concentrate and a second scavenging tailings; the second scavenging concentrate is returned to the slurry and incorporated into the first scavenging operation in step (3); the second scavenging tailings are flotation tailings; based on each ton of fine-grained copper oxide ore, add 175g of combination inhibitor, 200g of activator, 50g of collector and 10g of frother to the slurry of the second scavenging operation;

[0034] (5) Add the combined inhibitor and collector to the rough concentrate obtained in step (2) in sequence, and perform a first cleaning operation to obtain a first cleaning concentrate and a first cleaning tailings; the first cleaning tailings are returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 175g of combined inhibitor and 70g of collector to the slurry of the first cleaning operation.

[0035] (6) Add a collector to the primary concentrate obtained in step (5) and perform secondary cleaning to obtain secondary concentrate and secondary tailings; return the secondary tailings to the slurry and incorporate them into the primary cleaning operation in step (5); the secondary concentrate is a copper concentrate product; 35g of collector is added to the slurry of the secondary cleaning operation per ton of fine-grained copper oxide ore.

[0036] In this embodiment, the copper flotation recovery rate was 85.8%.

[0037] Example 2: In this example, based on 100 parts by weight of the combined inhibitor, there are 20 parts of aminotriacetic acid, 30 parts of lactic acid, 40 parts of tannin, and 10 parts of polyferric sulfate; based on 100 parts by weight of the activator, there are 40 parts of ammonium sulfate, 10 parts of ethylenediamine phosphate, and 50 parts of sodium sulfide; based on 100 parts by weight of the collector, there are 80 parts of isoamyl xanthate and 20 parts of butylammonium black powder.

[0038] The method for applying the combined inhibitor in the flotation of fine-grained copper oxide ore (see...) Figure 1 The specific steps are as follows:

[0039] (1) The fine-grained copper oxide ore is crushed and ground to fully dissociate the copper oxide minerals in the ore. Water is added to adjust the slurry to a slurry mass percentage concentration of 30%, wherein the copper mass percentage content in the fine-grained copper oxide ore is 1.1%.

[0040] (2) Add the combined inhibitor, activator, collector and frother to the slurry obtained in step (1) in sequence, and carry out roughing operation to obtain roughing concentrate and roughing tailings; based on each ton of fine-grained copper oxide ore, add 1000g of combined inhibitor, 2000g of activator, 550g of collector and 50g of frother to the slurry of the roughing operation.

[0041] (3) Add a combination inhibitor, activator, collector and frother to the roughing tailings obtained in step (2) in sequence, and perform a scavenging operation to obtain a scavenging concentrate and a scavenging tailings; the scavenging concentrate is returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 500g of combination inhibitor, 1000g of activator, 275g of collector and 25g of frother to the slurry of the scavenging operation;

[0042] (4) Add a combination inhibitor, activator, collector and frother to the tailings obtained in step (3) in sequence, and perform a second scavenging operation to obtain a second scavenging concentrate and a second scavenging tailings; the second scavenging concentrate is returned to the slurry and incorporated into the first scavenging operation in step (3); the second scavenging tailings are flotation tailings; based on each ton of fine-grained copper oxide ore, add 250g of combination inhibitor, 250g of activator, 75g of collector and 15g of frother to the slurry of the second scavenging operation;

[0043] (5) Add the combined inhibitor and collector to the rough concentrate obtained in step (2) in sequence, and perform a first cleaning operation to obtain a first cleaning concentrate and a first cleaning tailings; the first cleaning tailings are returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 250g of combined inhibitor and 110g of collector to the slurry of the first cleaning operation.

[0044] (6) Add a collector to the primary concentrate obtained in step (5) and perform secondary cleaning to obtain secondary concentrate and secondary tailings; return the secondary tailings to the slurry and incorporate them into the primary cleaning operation in step (5); the secondary concentrate is a copper concentrate product; 55g of collector is added to the slurry of the secondary cleaning operation per ton of fine-grained copper oxide ore.

[0045] In this embodiment, the copper flotation recovery rate was 87.6%.

[0046] Example 3: In this example, based on 100 parts by weight of the combined inhibitor, there are 25 parts of aminotriacetic acid, 25 parts of lactic acid, 45 parts of tannin, and 5 parts of polyferric sulfate; based on 100 parts by weight of the activator, there are 30 parts of ammonium sulfate, 15 parts of ethylenediamine phosphate, and 55 parts of sodium sulfide; based on 100 parts by weight of the collector, there are 85 parts of isoamyl xanthate and 15 parts of butylammonium black powder.

[0047] The method for applying the combined inhibitor in the flotation of fine-grained copper oxide ore (see...) Figure 1 The specific steps are as follows:

[0048] (1) The fine-grained copper oxide ore is crushed and ground to fully dissociate the copper oxide minerals in the ore. Water is added to adjust the slurry to a slurry mass percentage concentration of 35%, wherein the copper mass percentage content in the fine-grained copper oxide ore is 1.7%.

[0049] (2) Add the combined inhibitor, activator, collector and frother to the slurry obtained in step (1) in sequence, and carry out roughing operation to obtain roughing concentrate and roughing tailings; based on each ton of fine-grained copper oxide ore, add 1300g of combined inhibitor, 2400g of activator, 750g of collector and 70g of frother to the slurry of the roughing operation.

[0050] (3) Add a combination inhibitor, activator, collector and frother to the roughing tailings obtained in step (2) in sequence, and perform a scavenging operation to obtain a scavenging concentrate and a scavenging tailings; the scavenging concentrate is returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 650g of combination inhibitor, 1200g of activator, 375g of collector and 35g of frother to the slurry of the scavenging operation;

[0051] (4) Add a combination inhibitor, activator, collector and frother to the tailings obtained in step (3) in sequence, and perform a second scavenging operation to obtain a second scavenging concentrate and a second scavenging tailings; the second scavenging concentrate is returned to the slurry and incorporated into the first scavenging operation in step (3); the second scavenging tailings are flotation tailings; based on each ton of fine-grained copper oxide ore, add 325g of combination inhibitor, 300g of activator, 100g of collector and 20g of frother to the slurry of the second scavenging operation;

[0052] (5) Add the combined inhibitor and collector to the rough concentrate obtained in step (2) in sequence, and perform a first cleaning operation to obtain a first cleaning concentrate and a first cleaning tailings; the first cleaning tailings are returned to the slurry and incorporated into the roughing operation in step (2); based on each ton of fine-grained copper oxide ore, add 325g of combined inhibitor and 150g of collector to the slurry of the first cleaning operation.

[0053] (6) Add a collector to the primary concentrate obtained in step (5) and perform secondary cleaning to obtain secondary concentrate and secondary tailings; return the secondary tailings to the slurry and incorporate them into the primary cleaning operation in step (5); the secondary concentrate is a copper concentrate product; 75g of collector is added to the slurry of the secondary cleaning operation per ton of fine-grained copper oxide ore.

[0054] In this embodiment, the copper flotation recovery rate was 89.2%.

[0055] The specific embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. The application of a combined inhibitor in the flotation of fine-grained oxidized copper ore, characterized in that: The combined inhibitor is composed of aminotriacetic acid, lactic acid, tannin, and polyferric sulfate. Based on 100 parts by weight of the combined inhibitor, aminotriacetic acid is 15-25 parts, lactic acid is 25-35 parts, tannin is 35-45 parts, and polyferric sulfate is 5-15 parts. The specific steps of the application method are as follows: (1) The fine-grained copper oxide ore is crushed and ground to fully dissociate the copper oxide minerals in the ore, and water is added to adjust the slurry to a mass percentage concentration of 25-35%; (2) Add a combination of inhibitor, activator, collector and frother to the slurry obtained in step (1) in sequence, and carry out roughing operation to obtain roughing concentrate and roughing tailings; (3) Add a combination of inhibitor, activator, collector and frother to the roughing tailings obtained in step (2) in sequence, and perform a scavenging operation to obtain a scavenging concentrate and a scavenging tailings; the scavenging concentrate is returned to the pulping and incorporated into the roughing operation in step (2); (4) Add a combination inhibitor, activator, collector and frother to the tailings obtained in step (3) in sequence, and perform a second scavenging operation to obtain a second scavenging concentrate and a second scavenging tailings; the second scavenging concentrate is returned to the slurry preparation and incorporated into the first scavenging operation in step (3); the second scavenging tailings are flotation tailings; (5) Add a combination inhibitor and a collector to the rough concentrate obtained in step (2) in sequence, and perform a first cleaning operation to obtain a first cleaning concentrate and a first cleaning tailings; the first cleaning tailings are returned to the pulp conditioning and incorporated into the roughing operation in step (2); (6) Add a collector to the primary concentrate obtained in step (5) and perform secondary cleaning to obtain secondary concentrate and secondary tailings; return the secondary tailings to the slurry and incorporate them into the primary cleaning operation in step (5); the secondary concentrate is a copper concentrate product.

2. The application according to claim 1, characterized in that: The activator is a mixture of ammonium sulfate, ethylenediamine phosphate, and sodium sulfide, wherein, based on 100 parts by mass of the activator, ammonium sulfate comprises 30-40 parts, ethylenediamine phosphate comprises 10-20 parts, and sodium sulfide comprises 45-55 parts; the collector is a mixture of isoamyl xanthate and butylammonium black powder, wherein, based on 100 parts by mass of the collector, isoamyl xanthate comprises 75-85 parts, and butylammonium black powder comprises 15-25 parts; and the foaming agent is pine oil.

3. The application according to claim 1, characterized in that: Step (1) The mass percentage of copper in the fine-grained copper oxide ore is 0.5-1.7%.

4. The application according to claim 1, characterized in that: For each ton of fine-grained copper oxide ore, 700-1300g of combined inhibitor, 1600-2400g of activator, 350-750g of collector and 30-70g of frother are added to the slurry in step (2) roughing operation.

5. The application according to claim 1, characterized in that: For each ton of fine-grained copper oxide ore, 350-650g of combined inhibitor, 800-1200g of activator, 175-375g of collector and 15-35g of frother are added to the slurry of the first scavenging operation in step (3).

6. The application according to claim 1, characterized in that: For every ton of fine-grained copper oxide ore, 175-325g of combined inhibitor, 200-300g of activator, 50-100g of collector and 10-20g of frother are added to the slurry of the secondary scavenging operation in step (4).

7. The application according to claim 1, characterized in that: For every ton of fine-grained copper oxide ore, 175-325g of combined inhibitor and 70-150g of collector are added to the slurry of the first fine-refinement operation in step (5).

8. The application according to claim 1, characterized in that: For every ton of fine-grained copper oxide ore, 35-75g of collector is added to the slurry of the secondary beneficiation operation in step (6).

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