CN114534907A - Enrichment method and system of low-grade gold ore - Google Patents
Enrichment method and system of low-grade gold ore Download PDFInfo
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- CN114534907A CN114534907A CN202210232815.7A CN202210232815A CN114534907A CN 114534907 A CN114534907 A CN 114534907A CN 202210232815 A CN202210232815 A CN 202210232815A CN 114534907 A CN114534907 A CN 114534907A
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Abstract
The invention belongs to the technical field of metal mineral concentration, and particularly discloses a method and a system for enriching low-grade gold ores. The invention adopts the processes of coarse-medium fine crushing, closed-circuit screen underflow crushing, high-pressure roller grinding and grading, primary grinding and grading, column flotation and roughing and secondary flotation machine scavenging. The process adopts a method of more crushing and less grinding, and the full dissociation of the gold-bearing minerals is realized in the grinding stage. After the ore is levigated and the minerals are dissociated, the gold-bearing minerals are roughly separated through a flotation column and controlled by proper agents and circulating pressure conditions, so that the gold-bearing minerals are efficiently enriched and recovered, and meanwhile, the recovery rate of fine-particle micro-fine-particle gold is ensured. The process flow is simple, the problems of low grade of gold ore, difficult enrichment, difficult dissociation of fine embedded ore and low separation efficiency are well solved, and fine sorting is realized. Has very important significance for improving the grade of gold concentrate, saving energy, reducing consumption and producing green and low carbon.
Description
Technical Field
The invention relates to the technical field of metal mineral concentration, in particular to an enrichment method and system for low-grade gold ores.
Background
Gold ore is a valuable metal mineral resource, and multiple gold ore geological resources have the characteristics of less large ore, small scale, low grade and dispersed resources. The existing resources mainly comprise low-grade finely embedded gold ore resources. In order to solve the resource problem in the sustainable development of gold mine, many enterprises in gold mine begin to project the eye to gold mine resources of low grade. Through enhancement management, technological transformation, reduction in production cost make full use of low-grade gold mine resource can alleviate mine resource crisis, extension mine resource life-span, alleviate geological survey pressure, promote the whole technical level of gold industry constantly to improve, realize that the gold industry steps on novel industrialization's road step by step.
In order to improve the flotation index of low-grade gold, researchers have conducted many studies on the enhanced flotation separation of gold ore: (1) cyaniding gold extraction: the gold in the pulp is extracted by adding cyanide, and the carbon pulp method or the carbon leaching method is mostly used. The cyaniding tailings or backwater generated by the method contains heavy metal ions, cyanides and residual flotation reagents, and the cyanides are extremely toxic and cause environmental pollution due to long-term mass storage; (2) electrochemical regulation flotation technology: electrochemical regulation is applied in flotation production to change the potential condition of ore pulp. The recovery rate and the grade of the gold in the obtained concentrate are improved, but the process is complex and has high requirements on equipment. (3) Increase of flow and energy consumption: the breaking and grinding process is prolonged, the grinding fineness can be improved, and the dissociation effect of the gold ore is increased. The flotation and concentration process is prolonged, the enrichment times can be increased, and the concentrate grade is properly improved. The recovery rate can be properly improved by prolonging the scavenging process. However, after the flow is increased, the process energy consumption and the material consumption are increased, the dosage of the medicament is large, and the production cost is increased.
Therefore, how to provide an enrichment method and system for low-grade gold ore, reduce the process cost, improve the enrichment efficiency of the low-grade gold ore and comprehensively utilize resources is a difficult problem to be solved in the field.
Disclosure of Invention
In view of the above, the invention provides a method and a system for enriching low-grade gold ore, which realize the enrichment of low-grade gold ore with high efficiency and low cost, and have important significance for solving the environmental pollution and comprehensively utilizing resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for enriching low-grade gold ore comprises the following steps:
1) coarsely crushing and sieving low-grade gold ore to obtain oversize products and undersize products;
crushing the undersize materials by using a high-pressure roller mill and grinding the undersize materials in a closed circuit in sequence to obtain graded overflow products;
the oversize materials are subjected to medium crushing and fine crushing in sequence, and the obtained materials are returned to the sieving operation;
2) mixing the graded overflow product, a collecting agent, a foaming agent and water to obtain mixed ore pulp, and performing rough concentration to obtain rough concentration foam and underflow tailings;
3) mixing the underflow tailings obtained in the step 2) with a collecting agent and a foaming agent, and performing first scavenging to obtain first scavenging foam and first scavenging tailings;
mixing the first scavenging foam with the mixed ore pulp obtained in the step 2), and returning to the roughing operation;
4) mixing the first scavenging tailings obtained in the step 3) with a collecting agent and a foaming agent, and performing second scavenging to obtain second scavenging foams and second scavenging tailings;
mixing the second scavenging foam with the underflow tailings, the collecting agent and the foaming agent obtained in the step 2) to perform first scavenging again;
the roughing foam obtained in the step 2) is gold concentrate, and the second scavenging tailings obtained in the step 4) are final tailings products.
Preferably, the particle size of the low-grade gold ore is 320-380 mm.
Preferably, the particle size sieved in the step 1) is less than or equal to 20 mm.
Preferably, the particle size of the undersize product crushed by the high-pressure roller in the step 1) is less than or equal to 8 mm.
Preferably, after closed-circuit grinding in the step 1), a graded overflow product and the residual undersize are obtained, and the residual undersize is subjected to closed-circuit grinding again;
the graded overflow product is a graded overflow product with the fineness of-0.074 mm and the content of 60% +/-2%.
Preferably, the collector comprises a pentylxanthateOr an isoamyl xanthate; the foaming agent is 11#And (3) oil.
Preferably, the mass ratio of the classification overflow product, the collector, the foaming agent and the water in the step 2) is about 420-450: 0.06: 0.02: 580 to 550;
the mass ratio of underflow tailings, the collecting agent and the foaming agent in the step 3) is 380-420: 0.03: 0.01: 620 to 580;
the mass ratio of the first scavenged tailings, the collecting agent and the foaming agent in the step 4) is 360-400: 0.02: 0.01: 640 to 600.
Preferably, the roughing adopts a flotation column, the flotation column is a rotational flow-static microbubble flotation column, and the pressure of a circulating pipeline of the flotation column is 0.18-0.25 MPa.
Preferably, the first scavenging and the second scavenging are independent flotation machines.
The invention also aims to provide a system applicable to the enrichment method of low-grade gold ores, which comprises a jaw crusher for coarse crushing operation, a medium-crushing cone crusher, a fine-crushing cone crusher, a circular vibrating screen for detecting undersize, a high-pressure roller mill, a lattice type ball mill, a hydraulic cyclone for classification, a roughing stirring barrel, a cyclone-static microbubble flotation column for flotation roughing, a primary scanning flotation machine, a secondary scanning flotation machine, a gold concentrate concentrator and a chamber filter press.
The idea of the invention is as follows: the method of more crushing and less grinding is adopted, the energy consumption is reduced, and the gold-containing minerals are fully dissociated in the crushing and grinding stage. After the ore is ground and the mineral is dissociated, the ore is roughly separated by a flotation column, and the high-efficiency enrichment and recovery of gold-containing minerals are realized by using proper agents and circulating pressure condition control, and meanwhile, the recovery rate of fine-grain micro-fine-particle gold is ensured. And finally, directly roughing the low-grade gold ore to obtain gold concentrate with higher grade, and then scavenging by a flotation machine to further recover part of gold-containing mineral particles which cannot be recovered by roughing.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the scheme disclosed by the invention has the advantages of simple process and less flow, and reduces the operation times and the configuration of a large amount of equipment. Particularly, the flotation operation is completed by only adopting a coarse sweeping flow and a coarse sweeping flow, so that the enrichment and the recovery of low-grade gold ores are completed, and the configuration of concentration is reduced. The open circuit arrangement of the high-pressure roller mill is adopted in the front stage crushing stage, so that the crushing granularity is reduced, the configuration of ore grinding classification is reduced, and the required dissociation fineness can be achieved by adopting one stage of ore grinding classification operation. Not only simplifies the ore grinding grading flow, but also realizes 'more crushing and less grinding';
the process has high efficiency, not only strengthens dissociation, but also improves separation and enrichment effects. The method disclosed by the invention utilizes the advantages of the high-pressure roller mill, so that more ore crushing is generated along different mineral interfaces, or cracks are generated on a mineral junction surface and a mineral contact surface, and the ore grinding is more selective. The flotation process utilizes the advantages of thick foam layer and high enrichment efficiency of the flotation column, and gold concentrate with higher quality can be obtained only by adopting roughing operation through condition control, so that the enrichment ratio is further improved;
energy conservation, consumption reduction, green and low-carbon production. According to the invention, the high-pressure roller mill is adopted in the crushing stage, the lattice type ball mill is adopted in the ore grinding stage, and the high-efficiency rotational flow-static microbubble flotation column is adopted in the flotation stage, so that the process and the system flow are high in efficiency, the process is simple, the equipment configuration is reduced, and the reasonable process is adopted, so that the energy consumption distribution is more reasonable. Therefore, the overall method reduces energy consumption and saves energy cost. In the production process, the collecting agent isoamyl xanthate and the foaming agent 11# oil are less in adding amount, so that the medicament consumption is saved;
in a word, the enrichment method of the low-grade gold ore provided by the invention realizes the high-efficiency enrichment flotation of the low-grade (fine particle embedded) gold ore through the simple column-machine combined flotation, namely, the column roughing and the two-time scavenging of the flotation machine, effectively reduces the equipment configuration and the circulation of ore in the process, saves the medicament dosage and the power consumption, solves the problem that the low-grade gold ore needs to be concentrated and enriched for multiple times, has smooth process and convenient operation, obviously improves the operation enrichment ratio and the concentrate grade of the gold ore, and realizes the high-efficiency separation under the reasonable configuration of the front-stage crushing and grinding process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of the column-machine combined process of the present invention, wherein 1 is coarse crushing, 2 is inspection undersize, 3 is medium crushing, 4 is fine crushing, 5 is high-pressure roller mill, 6 is powder ore bin, 7 is ore mill, 8 is cyclone classification, 9 is stirring barrel, 10 is roughing, 11 is first scavenging, and 12 is second scavenging.
Detailed Description
The invention provides a method for enriching low-grade gold ores, which comprises the following steps:
1) coarsely crushing and sieving low-grade gold ore to obtain oversize products and undersize products;
crushing the undersize materials by using a high-pressure roller mill and grinding the undersize materials in a closed circuit in sequence to obtain graded overflow products;
the oversize materials are subjected to medium crushing and fine crushing in sequence, and the obtained materials are returned to the sieving operation;
2) mixing the graded overflow product, a collecting agent, a foaming agent and water to obtain mixed ore pulp, and performing rough concentration to obtain rough concentration foam and underflow tailings;
3) mixing the underflow tailings obtained in the step 2) with a collecting agent and a foaming agent, and performing first scavenging to obtain first scavenging foam and first scavenging tailings;
mixing the first scavenging foam with the mixed ore pulp obtained in the step 2), and performing roughing again;
4) mixing the first scavenging tailings obtained in the step 3) with a collecting agent and a foaming agent, and performing second scavenging to obtain second scavenging foams and second scavenging tailings;
mixing the second scavenging foam with the underflow tailings, the collecting agent and the foaming agent obtained in the step 2) to perform first scavenging again;
the roughing foam obtained in the step 2) is gold concentrate, and the second scavenging tailings obtained in the step 4) are final tailings products.
In the invention, the particle size of the low-grade gold ore is 320-380 mm, preferably 340-360 mm, and more preferably 350 mm.
In the invention, the gold content of the low-grade gold ore is less than or equal to 3g/t, preferably 0.8-1.5 g/t, and more preferably 1.2 g/t.
In the invention, the particle size sieved in the step 1) is less than or equal to 20mm, preferably 20 mm.
In the invention, the particle size of the undersize material crushed by the high-pressure roller in the step 1) is less than or equal to 8 mm.
In the invention, after closed-circuit grinding in the step 1), a graded overflow product and the residual undersize are obtained, and the residual undersize is subjected to closed-circuit grinding again;
the grading overflow product is a grading overflow product with the fineness of-0.074 mm and the content of 60% +/-2%, and the grading overflow product with the fineness of-0.074 mm 60% is formed by that mineral particles with the fineness of less than 0.074mm account for 60% of the total mass of the mineral particles.
In the present invention, the collector comprises sodium isoamyl xanthate; the foaming agent is 11#And (3) oil.
In the invention, the mass ratio of the graded overflow product, the collecting agent, the foaming agent and the water in the step 2) is 420-450: 0.06: 0.02: 580 to 550; preferably 430 to 440: 0.06: 0.02: 570-560; further preferably 435: 0.06: 0.02: 565.
the mass ratio of underflow tailings, the collecting agent and the foaming agent in the step 3) is 380-420: 0.03: 0.01: 620 to 580; preferably 390 to 410: 0.03: 0.01: 610-590; more preferably 400: 0.03: 0.01: 600.
the mass ratio of the first scavenging tailings, the collecting agent and the foaming agent in the step 4) is 360-400: 0.02: 0.01: 640-600, preferably 370-390: 0.02: 0.01: 630 to 610; further preferably 380: 0.02: 0.01: 620.
in the invention, a flotation column is adopted for roughing, the flotation column is a rotational flow-static microbubble flotation column, and the pressure of a circulating pipeline of the flotation column is 0.18-0.25 MPa, preferably 0.20-0.23 MPa, and further preferably 0.22 MPa; the thickness of the foam layer of the flotation column is 600-1000 mm, preferably 700-900 mm, and further preferably 800 mm.
In the invention, the first scavenging and the second scavenging independently adopt a flotation machine.
The combined process schematic diagram of the column machine is shown in figure 1, and comprises coarse crushing 1, inspection undersize 2, intermediate crushing 3, fine crushing 4, high-pressure roller milling 5, powder ore bin 6, ore grinding 7, cyclone classification 8, stirring barrel 9, coarse separation 10, first scavenging 11 and second scavenging 12.
The invention also provides a system applicable to the enrichment method of the low-grade gold ore, which comprises a coarse crushing operation jaw crusher, a medium-crushing cone crusher, a fine-crushing cone crusher, a circular vibrating screen for detecting undersize, a high-pressure roller mill, a lattice type ball mill, a hydraulic cyclone for classification, a roughing stirring barrel, a cyclone-static microbubble flotation column for flotation roughing, a primary-scanning flotation machine, a secondary-scanning flotation machine, a gold concentrate concentrator and a chamber type filter press.
In the invention, a coarse crushing operation jaw crusher is adopted for coarse crushing; performing intermediate crushing by using an intermediate crushing cone crusher; finely crushing by adopting a finely crushing cone crusher; screening operation in the step 1) is carried out by using a circular vibrating screen for checking undersize, high-pressure roller grinding crushing is carried out by using a high-pressure roller mill, grinding operation in closed circuit grinding is carried out by using a lattice type ball mill, classification overflow is carried out by using a hydraulic cyclone for classification, mixing of mixed ore pulp is carried out by using a roughing stirring barrel, roughing is carried out by using a cyclone-static microbubble flotation column for flotation, first scavenging is carried out by using a scavenging machine, second scavenging is carried out by using a second scavenging machine, and concentration and filtration operation is carried out by using a gold concentrate thickener and a chamber filter press.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Taking low-grade gold ore (grade 2g/t) with the particle size of 350mm, carrying out coarse crushing operation to finish primary crushing, conveying the product after the primary crushing to the operation of checking undersize materials by a belt, wherein the particle size of a sieve is 20mm, and the ore on the sieve is subjected to intermediate crushing and fine crushing and returns to the undersize materials to form a closed circuit. And (4) crushing the undersize ore by a high-pressure roller mill to obtain a crushed product with the particle size of less than 8mm, and then feeding the crushed product into a fine ore bin.
Grinding the crushed product with the fineness of less than 8mm, classifying by using a cyclone after grinding to obtain a classified overflow product with the fineness of-0.074 mm and the content of 60 percent and the residual undersize, and grinding the residual undersize again and classifying by using the cyclone to form closed-loop operation.
Mixing the graded overflow product with sodium isoamyl xanthate, 11# oil and water in a stirring barrel according to the mass ratio of 430: 0.06: 0.02: 570 to obtain mixed ore pulp, flowing to a cyclone-static microbubble flotation column for roughing operation, wherein the pressure of a circulating pipeline is as follows: 0.22MPa, the thickness of the foam layer is: 800mm, and roughing foam and underflow tailings are obtained after roughing; mixing the underflow tailings, sodium isoamyl xanthate and 11# oil according to the mass ratio of 410: 0.03: 0.01: 590 mixing, and carrying out first scavenging operation of a flotation machine to obtain first scavenging foam and first scavenging tailings; mixing the first scavenging foam with the mixed ore pulp, and performing roughing again; the first scavenging tailings, sodium isoamyl xanthate and 11# oil are mixed according to the mass ratio of 390: 0.03: 0.01: 610 mixing, and performing second scavenging operation on the flotation machine to obtain second scavenging foam and second scavenging tailings; and mixing the second scavenging foam with the underflow tailings, the sodium isoamyl xanthate and the 11# oil, and performing the first scavenging again.
The foam product obtained by rough concentration is the enriched gold concentrate (the gold grade of the product is 33.50g/t), and the obtained second scavenging tailings are the final tailings product (the gold grade is 0.07 g/t).
Example 2
Taking low-grade gold ore (grade 3g/t) with the grain size of 380mm, carrying out coarse crushing operation to finish primary crushing, conveying the product after the primary crushing to the operation of checking undersize materials by a belt, wherein the grain size of a sieve is 20mm, and the ore on the sieve is subjected to intermediate crushing and fine crushing and returns to the undersize materials to form a closed circuit. And (4) crushing the undersize ore by a high-pressure roller mill to obtain a crushed product with the particle size of less than 6mm, and then feeding the crushed product into a fine ore bin.
Grinding the crushed product with the fineness of less than 6mm, classifying by using a cyclone after grinding to obtain a classified overflow product with the fineness of-0.074 mm and the content of 59 percent and the residual undersize, and grinding the residual undersize again and classifying by using the cyclone to form closed-loop operation.
Mixing the graded overflow product with sodium isoamyl xanthate, 11# oil and water in a stirring barrel according to the mass ratio of 450: 0.06: 0.02: 550 mixing to obtain mixed ore pulp, and performing roughing operation by flowing to a rotational flow-static microbubble flotation column, wherein the pressure of a circulating pipeline is as follows: 0.19MPa, and the thickness of the foam layer is as follows: 1000mm, and obtaining roughing foam and underflow tailings after roughing; mixing the underflow tailings, sodium isoamyl xanthate and 11# oil according to the mass ratio of 420: 0.03: 0.01: 580 mixing, and carrying out first scavenging operation of a flotation machine to obtain first scavenging foam and first scavenging tailings; mixing the first scavenging foam with the mixed ore pulp, and performing roughing again; the first scavenging tailings, sodium isoamyl xanthate and 11# oil are mixed according to the mass ratio of 400: 0.02: 0.01: 600, mixing, and performing second scavenging operation on the flotation machine to obtain second scavenging foam and second scavenging tailings; and mixing the second scavenging foam with the underflow tailings, the sodium isoamyl xanthate and the 11# oil, and performing the first scavenging again.
The foam product obtained by rough concentration is enriched gold concentrate (the gold grade of the product is 40.80g/t), and the obtained second scavenging tailings are final tailings products (the gold grade is 0.08 g/t).
Example 3
Taking low-grade gold ore (grade 1.10g/t) with the particle size of 350mm, carrying out coarse crushing operation to finish primary crushing, conveying the product after the primary crushing to the operation of checking undersize materials by a belt, wherein the particle size of a sieve is 20mm, and returning the undersize materials to the check to form a closed circuit after intermediate crushing and fine crushing of the oversize materials. And (4) crushing the undersize ore by a high-pressure roller mill to obtain a crushed product with the particle size of less than 8mm, and then feeding the crushed product into a fine ore bin.
Grinding the crushed product with the fineness of less than 8mm, classifying by using a cyclone after grinding to obtain a classified overflow product with the fineness of-0.074 mm and the content of 60 percent and the residual undersize, and grinding the residual undersize again and classifying by using the cyclone to form closed-loop operation.
Mixing the graded overflow product with sodium isoamyl xanthate, 11# oil and water in a stirring barrel according to the mass ratio of 420: 0.06: 0.02: 580 mixing to obtain mixed ore pulp, and performing rough concentration operation by flowing to a rotational flow-static microbubble flotation column automatically, wherein the pressure of a circulating pipeline is as follows: 0.24MPa, the thickness of the foam layer is: 600mm, and roughing foam and underflow tailings are obtained after roughing; mixing the underflow tailings, sodium isoamyl xanthate and 11# oil according to a mass ratio of 380: 0.03: 0.01: 620, mixing, and performing first scavenging operation of a flotation machine to obtain first scavenging foam and first scavenging tailings; mixing the first scavenging foam with the mixed ore pulp, and performing roughing again; the first scavenging tailings, sodium isoamyl xanthate and 11# oil are mixed according to the mass ratio of 360: 0.03: 0.01: 640, mixing, and performing second scavenging operation on the flotation machine to obtain second scavenging foam and second scavenging tailings; and mixing the second scavenging foam with the underflow tailings, the sodium isoamyl xanthate and the 11# oil, and performing the first scavenging again.
The foam product obtained by rough concentration is the enriched gold concentrate (the gold grade of the product is 28.60g/t), and the obtained second scavenging tailings are the final tailings product (the gold grade is 0.06 g/t).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The enrichment method of the low-grade gold ore is characterized by comprising the following steps of:
1) coarsely crushing and sieving low-grade gold ore to obtain oversize products and undersize products;
crushing the undersize materials by using a high-pressure roller mill and grinding the undersize materials in a closed circuit in sequence to obtain graded overflow products;
the oversize materials are subjected to medium crushing and fine crushing in sequence, and the obtained materials are returned to the sieving operation;
2) mixing the graded overflow product, a collecting agent, a foaming agent and water to obtain mixed ore pulp, performing rough concentration, and then obtaining rough concentration foam and underflow tailings;
3) mixing the underflow tailings obtained in the step 2) with a collecting agent and a foaming agent, and performing first scavenging to obtain first scavenging foam and first scavenging tailings;
mixing the first scavenging foam with the mixed ore pulp obtained in the step 2), and returning to the roughing operation;
4) mixing the first scavenging tailings obtained in the step 3) with a collecting agent and a foaming agent, and performing second scavenging to obtain second scavenging foams and second scavenging tailings;
mixing the second scavenging foam with the underflow tailings, the collecting agent and the foaming agent obtained in the step 2) to perform first scavenging again;
the roughing foam obtained in the step 2) is gold concentrate, and the second scavenging tailings obtained in the step 4) are final tailings products.
2. The method according to claim 1, wherein the low-grade gold ore has a particle size of 320 to 380 mm.
3. The method for enriching low-grade gold ore according to claim 2, wherein the particle size sieved in the step 1) is less than or equal to 20 mm.
4. The method for enriching low-grade gold ore according to claim 3, wherein the particle size of the undersize product crushed by the high pressure roller mill in the step 1) is less than or equal to 8 mm.
5. The method for enriching low-grade gold ore according to claim 4, wherein the step 1) is performed with closed circuit grinding to obtain a graded overflow product and the residual undersize, and the residual undersize is performed with closed circuit grinding again;
the graded overflow product is a graded overflow product with the fineness of-0.074 mm and the content of 60% +/-2%.
6. The method for enriching low-grade gold ore according to any one of claims 1 to 5, wherein the collector comprises a pentyl xanthate or an isopentyl xanthate; the foaming agent is 11#And (3) oil.
7. The method for enriching low-grade gold ore according to claim 6, wherein the mass ratio of the graded overflow product, the collector, the foaming agent and the water in the step 2) is 420-450: 0.06: 0.02: 580 to 550;
the mass ratio of underflow tailings, the collecting agent and the foaming agent in the step 3) is 380-420: 0.03: 0.01: 620 to 580;
the mass ratio of the first scavenging tailings, the collecting agent and the foaming agent in the step 4) is 360-400: 0.02: 0.01: 640 to 600.
8. The method for enriching low-grade gold ore according to claim 7, wherein the roughing adopts a flotation column, the flotation column is a cyclone-static microbubble flotation column, and the pressure of a circulating pipeline of the flotation column is 0.18-0.25 MPa.
9. The method for enriching low-grade gold ore according to claim 7 or 8, wherein the first scavenging and the second scavenging are independent flotation machines.
10. The system applicable to the low-grade gold ore enrichment method of any one of claims 1 to 9, and is characterized by comprising a coarse crushing operation jaw crusher, a medium crushing cone crusher, a fine crushing cone crusher, a circular vibrating screen for detecting undersize, a high-pressure roller mill, a lattice type ball mill, a hydraulic cyclone for classification, a roughing stirring barrel, a cyclone-static microbubble flotation column for flotation and roughing, a primary sweeping flotation machine, a secondary sweeping flotation machine, a gold concentrate thickener and a chamber filter press.
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