CN109663653B - Process method for recycling copper by grading and regrinding copper-selecting tailings - Google Patents

Process method for recycling copper by grading and regrinding copper-selecting tailings Download PDF

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CN109663653B
CN109663653B CN201811369429.2A CN201811369429A CN109663653B CN 109663653 B CN109663653 B CN 109663653B CN 201811369429 A CN201811369429 A CN 201811369429A CN 109663653 B CN109663653 B CN 109663653B
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roughing
copper
tailings
regrinding
feeding
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CN109663653A (en
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王婷霞
赵天岩
苗梁
郭海宁
包玺琳
胡延明
刘坤
罗刚
刘剑
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Northwest Research Institute of Mining and Metallurgy
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks

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  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Food Science & Technology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a process method for recycling copper by grading and regrinding copper-selecting tailings, which comprises the following steps: (1) crushing and grading the large ore with the copper grade of 0.60-0.75%; (2) feeding the undersize product into a ball mill for primary grinding, secondary grinding and cyclone classification; (3) overflow products with the granularity of 68-73-200 meshes are respectively fed into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, tailings of the roughing I are fed into a roughing II, and concentrates obtained by the two sections of operation are combined into roughing concentrates; (4) feeding the roughed concentrate into a flotation column for fine selection operation; (5) feeding scavenged tailings into a cyclone for classification I operation; (6) grading II operation is carried out on the settled sand by using a 200-mesh high-frequency vibrating screen; (7) and feeding the obtained oversize product into an ore mill for regrinding, feeding the ore mill product into tailing roughing operation, feeding the roughing tailings into tailing scavenging, and discharging the scavenged tailings into a tailing pond.

Description

Process method for recycling copper by grading and regrinding copper-selecting tailings
Technical Field
The invention relates to the technical field of ore dressing processes, in particular to a process method for recycling copper by grading and regrinding copper dressing tailings.
Background
As the largest global copper consumption market, China consumes about 50% of global copper resources, however, the reserves of the copper resources in China only account for about 4% of the reserves all over the world, the resources are seriously insufficient, the consumption is high, China is quite passive in the aspect of copper ore pricing right, and the national resource safety is seriously harmed. To solve this dilemma, on one hand, the Chinese enterprises need to actively go out to expand the earth and buy some valuable mines, and on the other hand, the problem of improving the resource utilization rate is also a problem to be solved urgently.
Disclosure of Invention
In order to solve the problem of copper resource waste in the existing copper dressing tailings, the invention provides a process method for recycling copper by grading and regrinding the copper dressing tailings, which effectively recycles copper resources, avoids resource waste and brings substantial economic benefits to enterprises.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a process method for recycling copper by grading and regrinding copper-selecting tailings is characterized by comprising the following steps:
(1) crushing the large ore with the copper grade of 0.60-0.75%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the product on the screen to the fine crushing, and ensuring the granularity of the product under the screen to be 10-20 mm;
(2) feeding the undersize products into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone sand sediment to the secondary grinding to obtain 68-73% of overflow products with the granularity of-200 meshes;
(3) 68-73% of overflow products with the granularity of-200 meshes are respectively fed into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, the roughing I tailings are fed into roughing II operation, and the concentrates obtained by the two sections of operation are combined into roughing concentrates;
(4) feeding the roughed concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade of the concentrate is 18-20%, the roughed II tailings enter scavenging operation, and the scavenged concentrate and the concentrated tailings return to the roughed II operation;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing and discharging the cyclone to a tailing pond, and feeding settled sand into classification II operation;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) and (3) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 72-75% of an ore grinding product with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on the roughing tailings obtained by tailing roughing, returning scavenging concentrate obtained by tailing scavenging to the scavenging in the step (4), and discharging scavenged tailings obtained by tailing scavenging into a tailing pond.
In the step (1), a jaw crusher is used for coarse crushing, a standard cone crusher is used for medium crushing, and a short-head cone crusher is used for fine crushing.
Wherein, the ball mill in the step (2) has the size of phi 4000 multiplied by 6500.
Wherein, the specification of the cyclone in the step (2) is phi 350, and the overflow particle size is 68-73-200 meshes.
Wherein, the size of the roughing flotation column in the step (3) is phi 4.0m multiplied by 10.0 m.
Wherein the size of the flotation column in the step (4) is phi 3.2m multiplied by 10.0 m.
Wherein the specification of the cyclone in the step (5) is phi 350.
Wherein, the ore mill in the step (7) is a ball mill with the size of phi 2700 multiplied by 4000.
Wherein the specification of the flotation machine used for roughing and scavenging in the step (7) is 4m3。
The invention has the beneficial effects that: the directly discharged scavenging tailings are analyzed and tested, the copper grade of the tailings is 0.068% -0.075%, the yield of the + 120-mesh fraction is 19% -23%, the copper grade is 0.14% -0.18%, and the copper metal of the fraction still has a large recovery value after the tailings are subjected to particle size analysis. After the process flow (tailings are graded and reground by 150 meshes) is adopted, the copper grade of the tailings is 0.055-0.062%, the recovery rate is improved by 2%, the economic benefit of plant selection is greatly improved, and the further recovery of copper resources is realized.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Example 1
As shown in fig. 1, a process method for recycling copper by classifying and regrinding copper-selecting tailings comprises the following steps:
(1) crushing the large ore with the copper grade of 0.60%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the fine crushed product on a screen to the fine crushed product, and ensuring the granularity of the product under the screen to be 10mm, wherein the coarse crushing adopts a jaw crusher, the intermediate crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher;
(2) feeding the undersize product into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone settled sand to the secondary grinding to obtain 68% of overflow product with the granularity of-200 meshes, wherein the size of the ball mill is phi 4000 multiplied by 6500, the specification of the cyclone is phi 350, and the overflow particle size is 68-200 meshes;
(3) respectively feeding 68% of overflow products with the granularity of-200 meshes into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, feeding tailings of the roughing I operation into roughing II operation, and merging concentrates obtained by the two sections of operation into roughing concentrates, wherein the size of the roughing flotation columns is phi 4.0m multiplied by 10.0 m;
(4) feeding the rougher concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade of the concentrate is 18%, the rougher II tailings enter scavenging operation, and the scavenged concentrate and the concentrated tailings return to the rougher II operation, wherein the size of the flotation column is phi 3.2m multiplied by 10.0 m;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing the cyclone and discharging to a tailing pond, and feeding settled sand into classification II operation, wherein the specification of the cyclone is phi 350;
(6) performing classification II operation on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, discharging the undersize product into a tailing pond, and performing regrinding operation on the oversize product;
(7) feeding the oversize product obtained in the step (6) into an ore mill for re-grinding to obtain 72% -ground ore product with granularity of-200 meshes, and performing tailing roughing operation to obtain tailingsThe roughing concentrate returns to the roughing II operation in the step (3), the roughing tailings obtained by the tailing roughing enter tailing scavenging, scavenging concentrate obtained by the tailing scavenging returns to the scavenging in the step (4), the scavenged tailings obtained by the tailing scavenging are discharged into a tailing pond, the ore grinding machine is a ball mill with the size of phi 2700 x 4000, and the specification of a flotation machine used for roughing and scavenging is 4m3。
Example 2
As shown in fig. 1, a process method for recycling copper by classifying and regrinding copper-selecting tailings comprises the following steps:
(1) crushing the large ore with the copper grade of 0.75%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the fine crushed product on a screen to the fine crushed product, and the granularity of the product under the screen is 20mm, wherein the coarse crushing adopts a jaw crusher, the intermediate crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher;
(2) feeding the undersize products into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone settled sand to the secondary grinding to obtain 73% of overflow products with the granularity of-200 meshes, wherein the size of the ball mill is phi 4000 multiplied by 6500, the specification of the cyclone is phi 350, and the overflow particle size is 73-200 meshes;
(3) feeding 73% of overflow products with the granularity of-200 meshes into two series of roughing flotation columns through an ore pulp distributor respectively to carry out roughing I operation, feeding tailings of the roughing I operation into roughing II operation, and merging concentrates obtained by the two sections of operation into roughing concentrates, wherein the size of the roughing flotation columns is phi 4.0m multiplied by 10.0 m;
(4) feeding the rougher concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade of the concentrate is 20%, the rougher II tailings enter scavenging operation, and the scavenged concentrate and the concentrated tailings return to the rougher II operation, wherein the size of the flotation column is phi 3.2m multiplied by 10.0 m;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing the cyclone and discharging to a tailing pond, and feeding settled sand into classification II operation, wherein the specification of the cyclone is phi 350;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 75% of ore grinding products with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on roughing tailings obtained by tailing roughing, returning scavenging concentrate obtained by tailing scavenging to the scavenging in the step (4), discharging scavenged tailings obtained by tailing scavenging into a tailing pond, wherein the ore grinding machine is a ball mill with the size of phi 2700 x 4000, and the specification of a flotation machine used for roughing and scavenging is 4m3。
Example 3
As shown in fig. 1, a process method for recycling copper by classifying and regrinding copper-selecting tailings comprises the following steps:
(1) crushing the large ore with the copper grade of 0.61%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the fine crushed product on a screen to the fine crushed product, and ensuring the granularity of the product under the screen to be 10mm, wherein the coarse crushing adopts a jaw crusher, the intermediate crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher;
(2) feeding the undersize product into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone settled sand to the secondary grinding to obtain 69.4 percent of overflow product with the granularity of-200 meshes, wherein the size of the ball mill is phi 4000 multiplied by 6500, the specification of the cyclone is phi 350, and the overflow size fraction is 73-200 meshes;
(3) respectively feeding 69.4% of overflow products with the granularity of-200 meshes into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, feeding the roughing I tailings into roughing II operation, and merging the concentrates obtained by the two sections of operation into roughing concentrates, wherein the specification of a cyclone is phi 350, the overflow grain level is 69.4-200 meshes, and the size of the roughing flotation columns is phi 4.0m multiplied by 10.0 m;
(4) feeding the rougher concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade is 18.52%, the recovery rate is 91.09%, the rougher II tailings enter scavenging operation, and the scavenged concentrate and the cleaner tailings return to the rougher II operation, wherein the size of the flotation column is phi 3.2m multiplied by 10.0 m;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing the cyclone and discharging to a tailing pond, and feeding settled sand into classification II operation, wherein the specification of the cyclone is phi 350;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 72% of ore grinding product with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on roughing tailings obtained by tailing roughing, returning scavenged concentrate obtained by tailing scavenging to the scavenging in the step (4), discharging scavenged tailings obtained by tailing scavenging into a tailing pond, wherein the ore grinding machine is a ball mill with the size of phi 2700 x 4000, and the specification of a flotation machine used for roughing and scavenging is 4m3。
Example 4
As shown in fig. 1, a process method for recycling copper by classifying and regrinding copper-selecting tailings comprises the following steps:
(1) crushing the large ore with the copper grade of 0.72%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the fine crushed product on a screen to the fine crushed product, and ensuring the granularity of the product under the screen to be 10mm, wherein the coarse crushing adopts a jaw crusher, the intermediate crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher;
(2) feeding the undersize products into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone settled sand to the secondary grinding to obtain 70% of overflow products with the granularity of-200 meshes, wherein the size of the ball mill is phi 4000 multiplied by 6500, the specification of the cyclone is phi 350, and the overflow particle size is 73-200 meshes;
(3) respectively feeding 70% of overflow products with the granularity of-200 meshes into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, feeding tailings of the roughing I into roughing II operation, and merging the concentrates obtained by the two sections of operation into roughing concentrates, wherein the specification of a cyclone is phi 350, the overflow fraction is 70-200 meshes, and the size of each roughing flotation column is phi 4.0m multiplied by 10.0 m;
(4) feeding the rougher concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade is 19.37%, the recovery rate is 91.95%, the rougher II tailings enter scavenging operation, and the scavenged concentrate and the cleaner tailings return to the rougher II operation, wherein the size of the flotation column is phi 3.2m multiplied by 10.0 m;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing the cyclone and discharging to a tailing pond, and feeding settled sand into classification II operation, wherein the specification of the cyclone is phi 350;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 74% of ore grinding products with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on the roughing tailings obtained by tailing roughing, returning scavenged concentrate obtained by tailing scavenging to the scavenging in the step (4), discharging scavenged tailings obtained by tailing scavenging into a tailing pond, wherein the ore grinding machine is a ball mill with the size of phi 2700 x 4000, and the specification of a flotation machine used for roughing and scavenging is 4m3。
Example 5
As shown in fig. 1, a process method for recycling copper by classifying and regrinding copper-selecting tailings comprises the following steps:
(1) crushing the large ore with the copper grade of 0.68%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the fine crushed product on a screen to the fine crushed product, and ensuring the granularity of the product under the screen to be 10mm, wherein the coarse crushing adopts a jaw crusher, the intermediate crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher;
(2) feeding the undersize products into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone settled sand to the secondary grinding to obtain 70% of overflow products with the granularity of-200 meshes, wherein the size of the ball mill is phi 4000 multiplied by 6500, the specification of the cyclone is phi 350, and the overflow particle size is 73-200 meshes;
(3) respectively feeding 70% of overflow products with the granularity of-200 meshes into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, feeding tailings of the roughing I into roughing II operation, and merging the concentrates obtained by the two sections of operation into roughing concentrates, wherein the specification of a cyclone is phi 350, the overflow fraction is 70-200 meshes, and the size of each roughing flotation column is phi 4.0m multiplied by 10.0 m;
(4) feeding the rougher concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade is 20.53%, the recovery rate is 91.30%, the rougher II tailings enter scavenging operation, and the scavenged concentrate and the cleaner tailings return to the rougher II operation, wherein the size of the flotation column is phi 3.2m multiplied by 10.0 m;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing the cyclone and discharging to a tailing pond, and feeding settled sand into classification II operation, wherein the specification of the cyclone is phi 350;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 74.6% of an ore grinding product with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on the roughing tailings obtained by tailing roughing, returning scavenged concentrate obtained by tailing scavenging to the step (4), discharging scavenged tailings obtained by tailing scavenging into a tailing pond, wherein the ore grinding machine is a ball mill with the size of phi 2700 x 4000, and the specification of a flotation machine used for roughing and scavenging is 4m3。

Claims (9)

1. A process method for recycling copper by grading and regrinding copper-selecting tailings is characterized by comprising the following steps:
(1) crushing the large ore with the copper grade of 0.60-0.75%, wherein the crushing process comprises coarse crushing, intermediate crushing and fine crushing to obtain a fine crushed product, screening the fine crushed product, returning the product on the screen to the fine crushing, and ensuring the granularity of the product under the screen to be 10-20 mm;
(2) feeding the undersize products into a ball mill for primary grinding, secondary grinding and cyclone classification, and returning the cyclone sand sediment to the secondary grinding to obtain 68-73% of overflow products with the granularity of-200 meshes;
(3) 68-73% of overflow products with the granularity of-200 meshes are respectively fed into two series of roughing flotation columns through an ore pulp distributor to carry out roughing I operation, the roughing I tailings are fed into roughing II operation, and the concentrates obtained by the two sections of operation are combined into roughing concentrates;
(4) feeding the roughed concentrate into a flotation column for concentration operation, wherein the concentrate obtained by the concentration operation is the final copper concentrate, the copper grade of the concentrate is 18-20%, the roughed II tailings enter scavenging operation, and the scavenged concentrate and the concentrated tailings return to the roughed II operation;
(5) feeding scavenged tailings into a cyclone for classification I operation, wherein the classification granularity of the cyclone is 120 meshes, overflowing and discharging the cyclone to a tailing pond, and feeding settled sand into classification II operation;
(6) classifying II operation is carried out on the settled sand obtained in the step (5) by using a 200-mesh high-frequency vibrating screen, the undersize product is discharged into a tailing pond, and the oversize product is subjected to regrinding operation;
(7) and (3) feeding the oversize product obtained in the step (6) into an ore grinding machine for regrinding to obtain 72-75% of an ore grinding product with the granularity of-200 meshes, performing tailing roughing operation, returning roughing concentrate obtained by tailing roughing to the roughing II operation in the step (3), performing tailing scavenging on the roughing tailings obtained by tailing roughing, returning scavenging concentrate obtained by tailing scavenging to the scavenging in the step (4), and discharging scavenged tailings obtained by tailing scavenging into a tailing pond.
2. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: in the step (1), a jaw crusher is used for coarse crushing, a standard cone crusher is used for medium crushing, and a short-head cone crusher is used for fine crushing.
3. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: the size of the ball mill in the step (2) is phi 4000 multiplied by 6500.
4. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: in the step (2), the specification of the cyclone is phi 350, and the overflow particle size fraction is 68-73-200 meshes.
5. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: the size of the roughing flotation column in the step (3) is phi 4.0m multiplied by 10.0 m.
6. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: the size of the flotation column in the step (4) is phi 3.2m multiplied by 10.0 m.
7. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: the specification of the swirler in the step (5) is phi 350.
8. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to claim 1, is characterized in that: the ore mill in the step (7) is a ball mill with the size phi of 2700 multiplied by 4000.
9. The process method for recycling copper through grading and regrinding of copper-dressing tailings according to any one of claims 1 to 8, is characterized in that: the specification of the flotation machine used for roughing and scavenging in the step (7) is 4m3。
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