Copper rough concentrate regrinding system capable of preferentially selecting copper and improving recovery rate

Abstract

The utility model discloses a copper rough concentrate regrinding system capable of preferentially selecting copper and improving the recovery rate, which comprises a first-section grinding ball mill for processing raw ore, a discharge port of the first-section grinding ball mill is connected with a grader, and an overflow port of the grader is connected with a stirring barrel, and is characterized in that a roughing unit is arranged behind the stirring barrel and is connected to a regrinding system; the regrinding system comprises a pump pool for storing rough concentrate, and the pump pool is connected to a cyclone through a slurry pump; a primary concentration unit in the flotation unit is connected with an overflow port of the cyclone, the primary concentration unit is connected with a secondary concentration unit, and the secondary concentration unit is connected with a copper concentrate pond; and a regrinding ball mill is connected with the sand setting area of the cyclone and is connected with the pump pool. And the fineness is greatly improved, monomer dissociation among useful minerals is relatively sufficient, the copper flotation index is stabilized, a copper concentrate product obtains a relatively good grading index, and the copper concentrate grade and the copper recovery rate are improved.

Description

Technical Field

[0001] The utility model relates to ore dressing technology, in particular to a copper coarse concentrate regrinding system which can select copper first and improve the recovery rate. Background Art

[0002] The metal minerals in the selected raw ore are mainly pyrite (FeS2), pyrrhotite (Fe n S n+1 n=5-16) In the case of magnetite chalcopyrite, the gangue minerals are mainly serpentine, chlorite, talc and quartz, and associated minerals (CuFeS2), as well as a small amount of covellite (CuS) and bornite (Cu5FeS4). These minerals exist in many forms, with complex structures, and are distributed in an unequal and unevenly impregnated manner. Their symbiotic forms include inlay and inlay, encapsulation and encapsulation, and they coexist densely together. Among them, chalcopyrite mainly has the following embedded forms: ① Chalcopyrite is filled alternately along the cracks of gangue such as garnet, and it can be seen that chalcopyrite contains alternating residual gangue, etc. Some chalcopyrite is distributed in the gangue in an impregnated manner, and the particle size is uneven; ② Chalcopyrite alternates with pyrite, marcasite, and pyrrhotite; ③ Chalcopyrite alternates with magnetite, and is coexisting in a harbor shape.

[0003] The existing mineral processing process is generally as follows: after a stage of grinding, the overflow enters the copper selection operation, with one roughing selection, two fine selections, two scavenging selections, and sulfur selection from copper tailings. Due to the complex nature of the selected ore, the grade of copper concentrate is generally only about 15% according to the traditional process, and the copper recovery rate is about 77%. According to practice, the selection methods of copper-sulfur mixed flotation, re-grinding the mixed concentrate, and then separating copper and sulfur, or the method of preferentially selecting copper, selecting sulfur from copper tailings, and combining and re-grinding copper rough concentrate and middlings are not ideal. Investigating the root causes, the main reasons for the low grade of copper concentrate and serious tailings are as follows:

[0004] First, in the first stage of grinding, the overflow fineness of -200 mesh is controlled at about 70%, and the useful minerals in the coarse concentrate cannot be dissociated into monomers, especially the content of copper-sulfur complexes is very high, which leads to the decrease of copper concentrate grade due to excessive sulfur content; second, because the grade of copper concentrate is not high, it is easy to mislead operators to reduce the amount of collector during operation, thus affecting the recovery rate; third, because the useful minerals have not been completely dissociated into monomers, a part of the middlings contains a large amount of copper-sulfur complexes, which are easily affected by inhibitors during recovery and fail to float up, and eventually enter the tailings to cause tailings running, affecting the copper recovery rate. Summary of the invention

[0005] The purpose of the utility model is to solve the above problems and provide a copper rough concentrate regrinding system which can give priority to copper and improve the recovery rate. The system has the characteristics of simple operation, can promote the monomer dissociation of each useful mineral in the rough concentrate, reduce the content of copper-sulfur complexes, and can greatly improve the grade of copper concentrate and copper recovery rate.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: a copper coarse concentrate regrinding system for preferentially selecting copper and improving the recovery rate, comprising a first-stage grinding ball mill for processing raw ore, the discharge port of the first-stage grinding ball mill is connected to a classifier, and the overflow port of the classifier is connected to a stirring barrel, wherein a roughing unit is arranged after the stirring barrel, and the roughing unit is connected to the regrinding system; the regrinding system comprises a pump pool for storing coarse concentrate, and the pump pool is connected to a cyclone through a slurry pump; a primary concentrator unit in a flotation unit is connected to the overflow port of the cyclone, the primary concentrator unit is connected to a secondary concentrator unit, and the secondary concentrator unit is connected to a copper concentrate pool; a regrinding ball mill is arranged in a sand settling area of ​​the cyclone, and the regrinding ball mill is connected to the pump pool.

[0007] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the flotation unit also includes a primary scavenging unit and a secondary scavenging unit, the secondary scavenging unit includes a tailings unit, and the tailings unit is connected to the tail of the next operating area.

[0008] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the roughing unit provided after the stirring barrel is connected to the pump pool and connected to the primary scavenging unit at the same time.

[0009] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the slurry pump extraction port is located at the bottom of the pump pool, and the slurry pump includes a main slurry pump and a spare slurry pump.

[0010] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the concentrate product of the primary scavenging unit is provided with a pipeline returning to the feed port of the roughing unit.

[0011] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the concentrate product of the secondary scavenging unit is provided with a pipeline returning to the feed port of the primary scavenging unit.

[0012] In the aforementioned copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate, preferably, the tailings product of the primary concentrator unit is provided with an intermediate chamber, a gate regulating device and a pipeline for returning to the roughing unit.

[0013] In the aforementioned copper coarse concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the tailings product of the secondary concentration unit is provided with an intermediate chamber, a gate regulating device and a pipeline for returning to the primary concentration unit.

[0014] In the aforementioned copper coarse concentrate regrinding system for preferentially selecting copper to improve recovery rate, preferably, the discharge port of the first-stage ball mill overflows from a classifier and enters a mixing barrel, and the returned sand returns to the first-stage ball mill feed hopper.

[0015] This technical solution is studied on the basis of traditional mineral processing, from the first-stage ball mill for processing the raw ore to the classifier and the mixing barrel. Aiming at the problems existing in the subsequent flotation of the metal minerals in the selected raw ore, a group of regrinding circulation systems are designed after the stirring roughing to change the existing route of the rough concentrate directly entering the primary concentration (referred to as the first concentration, the same below), the concentrate from the primary concentration entering the secondary concentration (referred to as the second concentration, the same below), and the copper concentrate being selected from the secondary concentration.

[0016] In the regrinding circulation system, a buffer pump pool is provided for the rough concentrate. The mineral materials in the pump pool are pumped into the hydrocyclone through the slurry pump. Under the action of the hydrocyclone, the suspended overflow fluid flows into the flotation unit for primary and secondary selection. Copper concentrate is obtained; the copper-containing coarse sand output from the hydrocyclone sand settling port is sent to the regrinding ball mill for grinding; and the output material of the regrinding ball mill returns to the pump pool. Next, the mineral materials in the pump pool are pumped into the hydrocyclone through the slurry pump, and this repetition constitutes a cycle operation, so that each useful mineral in the rough concentrate is dissociated into a monomer, greatly reducing copper-sulfur complexes.

[0017] While carrying out the above process, this scheme continues the primary and secondary scavenging of the flotation unit. In order to improve the efficiency and recovery rate of each level of separation, the qualified ore obtained by the roughing unit after the mixing barrel is also sent to the primary scavenging unit. In addition, the primary scavenging unit is also equipped with a pipeline returning to the feed port of the roughing unit; the secondary scavenging unit is equipped with a pipeline returning to the feed port of the primary scavenging unit; after the primary selection, there is a conveying pipeline returning to the roughing unit; the secondary selection unit is also equipped with a pipeline returning to the primary selection unit for repeated operations, etc., so that the metal minerals in the selected ore are basically recovered.

[0018] Compared with the prior art, the utility model has the following beneficial effects: after the coarse concentrate is regrinded, the fineness is greatly improved, and the monomer dissociation between useful minerals is relatively sufficient, creating good conditions for the next step of copper-sulfur separation and selection; it greatly reduces the inherent deficiencies caused by one-stage grinding, brings great convenience to the operation, stabilizes the flotation state, and can easily use drugs according to the mineral foam state, control the liquid level and adjust the inflation volume, etc., and finally stabilizes the copper flotation index; the copper concentrate product has achieved better selection indicators, and greatly improved the copper concentrate grade and copper recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a process flow chart.

[0020] Figure 2 It is a schematic diagram of a composition structure of the utility model.

[0021] In the figure: 1-first stage ball mill, 2-mixing barrel, 3-regrinding system, 301-cyclone, 302-regrinding ball mill, 303-slurry pump, 304-pump tank, 4-flotation unit.

[0022] W-copper tailings, J-copper concentrate. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0024] This embodiment is a copper concentrate regrinding system that preferentially selects copper to improve recovery rate. Figure 1 , Figure 2 A first-stage ball mill 1 is provided for receiving the raw ore. The discharge port of the first-stage ball mill 1 is connected to a classifier, and the overflow port of the classifier is connected to a mixing barrel 2. After overflow from the classifier, a part of the material that meets the standards enters the mixing barrel 2, and the other part that does not meet the standards is returned to the first-stage ball mill 1 for another grinding.

[0025] The flotation unit 4 also includes a primary scavenging unit and a secondary scavenging unit. The secondary scavenging unit includes a tailings unit, and the tailings unit is connected to the tail of the next operating area - sulfur removal.

[0026] The regrinding system 3 includes a cyclone 301 , a regrinding ball mill 302 , a pump pool 304 and a slurry pump.

[0027] A roughing unit is arranged behind the mixing barrel 2, and the roughing unit is connected to the pump pool 304 in the regrinding system 3 and is connected to the primary scavenging unit at the same time.

[0028] The pump pool 304 is used as the material storage of the regrinding system. The pump pool 304 is connected to the cyclone 301 through the slurry pump 303. There are two slurry pumps 303: the main slurry pump and the standby slurry pump. When working, a single slurry pump 303 is selected. The extraction port of the slurry pump 303 is located at the bottom of the pump pool 304. The selection of the slurry pump 303 should be compatible with the operation requirements of the cyclone 301 to ensure the rated pressure of the cyclone 301 so that the cyclone 301 can achieve the best classification effect. The overflow port of the cyclone 301 is connected to the primary concentrator unit in the flotation unit 4, the primary concentrator unit is connected to the secondary concentrator unit, and the secondary concentrator unit is connected to the copper concentrate pool. The regrinding ball mill 302 is connected to the sedimentation area of ​​the cyclone 301, and the regrinding ball mill 302 is connected to the pump pool 304.

[0029] Furthermore, the concentrate product of the primary scavenging unit is provided with a pipeline returning to the feed port of the roughing unit; the concentrate product of the secondary scavenging unit is provided with a pipeline returning to the feed port of the primary scavenging unit. The tailings product of the primary concentrator unit is provided with an intermediate room, a gate regulating device and a pipeline returning to the roughing unit; the tailings product of the secondary concentrator unit is provided with an intermediate room, a gate regulating device and a pipeline returning to the primary concentrator unit.

[0030] Working principle and process flow: After the raw ore is crushed, it enters the first-stage grinding ball mill 1. After the output of the first-stage grinding ball mill 1 is classified, a part enters the mixing barrel 2, and the other part returns to the first-stage grinding ball mill 1 for grinding again; after the mixing barrel 2, rough selection is carried out, and the coarse concentrate obtained from the rough selection is sent to the pump pool 304, and is pumped into the cyclone 301 by the slurry pump 303. After classification by the cyclone 301, the overflow product enters the primary selection, and the product of the primary selection enters the secondary selection, and the copper concentrate is selected from the secondary selection. At the same time, the sediment in the cyclone 301 is sent to the regrinding ball mill 302 for re-grinding, and the ground product is sent to the pump pool 304 again, and is combined with the coarse concentrate and pumped to the cyclone 301 again by the slurry pump 303, forming a closed circuit, and the cycle operation is repeated. In addition, the overflow product during the rough selection is connected to the tailings area after passing through the primary scavenging unit and the secondary scavenging unit in the flotation unit 4.

[0031] Through the coarse concentrate regrinding system of this embodiment, the fineness is greatly improved. After screening analysis, the -200 mesh content is increased from the original 70% to 95%. The monomer dissociation between useful minerals is relatively sufficient, creating good conditions for the next step of copper and sulfur separation. Due to the stable flotation state, it is easy to use drugs according to the mineral foam state, control the liquid level and adjust the inflation volume, etc., and finally stabilize the copper flotation index.

[0032] The comparison of copper separation indexes of this embodiment and the traditional process is shown in the following table:

[0033] name Copper concentrate grade (%) Copper recovery rate (%) Traditional process 15.4 77.5 Regrinding system 18.5 82.8 Increase 3.1 5.3

[0034] It can be seen from the above table that, through the copper rough concentrate regrinding system of this embodiment which preferentially selects copper to improve the recovery rate, the copper concentrate grade is increased by 3.1% and the copper recovery rate is increased by 5.3%.

[0035] The above embodiments are illustrations of the present invention, not limitations of the present invention. Without departing from the principles of the present technical solution, any equivalent changes or equivalent modifications made in accordance with the technical ideas proposed by the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A copper concentrate regrinding system for preferentially selecting copper and improving recovery rate, comprising a first-stage ball mill (1) for processing raw ore, a discharge port of the first-stage ball mill connected to a classifier, and an overflow port of the classifier connected to a stirring barrel (2), wherein the system is characterized in that A roughing unit is provided after the mixing barrel, and the roughing unit is connected to a regrinding system (3); the regrinding system comprises a pump pool (304) for storing rough concentrate, and the pump pool is connected to a cyclone (301) through a slurry pump (303); a primary concentrator in a flotation unit (4) is connected to the overflow port of the cyclone, the primary concentrator is connected to a secondary concentrator, and the secondary concentrator is connected to a copper concentrate pool; a regrinding ball mill (302) is provided in connection with a cyclone sand settling area, and the regrinding ball mill is connected to the pump pool.

2. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 1, characterized in that: The flotation unit (4) further comprises a primary scavenging unit and a secondary scavenging unit, wherein the secondary scavenging unit is connected to a tailings unit, and the tailings unit is connected to the tail of the next operating area.

3. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 2, characterized in that: The roughing machine unit provided after the mixing barrel (2) is connected to the pump pool (304) and is also connected to the primary scavenging machine unit.

4. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 1, characterized in that: The extraction port of the slurry pump (303) is located at the bottom of the pump pool (304), and the slurry pump includes a main slurry pump and a standby slurry pump.

5. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 2 or 3, characterized in that: The concentrate product of the primary scavenging unit is provided with a pipeline to return to the feed port of the roughing unit.

6. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 5, characterized in that: The concentrate product of the secondary scavenging unit is provided with a pipeline returning to the feed port of the primary scavenging unit.

7. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 1, characterized in that: The tailings products of the primary concentrator unit are equipped with an intermediate chamber, gate adjustment device and pipeline for returning to the rougher unit.

8. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 1 or 7, characterized in that: The tailings products of the secondary concentration unit are equipped with an intermediate chamber, gate regulating device and pipeline for returning to the primary concentration unit.

9. A copper rough concentrate regrinding system for preferentially selecting copper and improving recovery rate according to claim 1, characterized in that: The discharge port of the first-stage ball mill (1) overflows from the classifier and enters the mixing barrel (2), and the returned sand returns to the first-stage ball mill feed hopper.

Images