CN106890719B

CN106890719B - Ore grinding system and method thereof

Info

Publication number: CN106890719B
Application number: CN201710087953.XA
Authority: CN
Inventors: 陈建龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-02-18
Filing date: 2017-02-18
Publication date: 2020-05-19
Anticipated expiration: 2037-02-18
Also published as: CN106890719A

Abstract

The invention discloses an ore grinding system and an ore grinding method, wherein the ore grinding system comprises a ball mill, a hydrocyclone unit, a sand separator and a single-layer thickener; one end of the classifying pump groove is connected to the hydrocyclone group through the classifying pump, one end of the hydrocyclone group is connected to the ball mill through the ore inlet pipe, the other end of the ball mill is connected to the classifying pump groove through the ore discharge pipe, a branch pipe of the ore inlet pipe is connected to the sampling groove above the second floor, the other end of the hydrocyclone group is connected to the overflow pipe, and the outlet end of the overflow pipe is located above the sand separator; the lower end of the sand separator is connected to the sampling groove through a sand settling pipe, a second rubber pipe valve is mounted on the sand settling pipe, and the upper end of the sand separator is connected to the single-layer thickener through a mud overflow pipe. The ore grinding system and the method thereof have reasonable design, and the sand separator is added to ensure the monomer dissociation of large granular gold; the use method is simple, reduces the waste of resources and is more environment-friendly.

Description

Ore grinding system and method thereof

Technical Field

The invention relates to the field of metal metallurgy, in particular to an ore grinding system and an ore grinding method.

Background

The ore grinding system is a preceding stage process of cyaniding leaching operation and is also a relatively more critical link. Generally, after grinding by a ball mill, classifying by a hydrocyclone, directly discharging an overflow product into a thickener, and feeding the concentrated pulp into a lower process. And the settled sand (unqualified ore particles) is returned to the ball mill for regrinding. Due to the influence of various factors such as cyclone classification efficiency, ball mill efficiency, field process parameter adjustment, production control and the like in the working process of the system, the classified overflow product contains partial unqualified ore particles, and the gold content of the partial unqualified ore particles reaches 150-650 g/ton or even higher. In the production process, the gold cannot be recycled in general due to the unit cost, so that the waste of limited resources is caused.

Disclosure of Invention

The present invention is directed to a grinding system and a method thereof, which solve the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

an ore grinding system comprises a ball mill, a hydrocyclone group, a sand separator and a single-layer thickener; the outlet end of an ore supply pipeline of a preceding stage section is positioned above a grading pump groove, one end of the grading pump groove is connected to a hydrocyclone unit through a grading pump, the hydrocyclone unit comprises a plurality of cyclones, a pressure gauge is mounted at the upper end of the hydrocyclone unit, one end of the hydrocyclone unit is connected to a ball mill through an ore inlet pipe, the other end of the ball mill is connected to the grading pump groove through an ore discharge pipe, the grading pump groove, the grading pump and the ball mill are all arranged below a second-layer ground, a branch pipe of the ore inlet pipe is connected to a sampling groove above the second-layer ground, the other end of the hydrocyclone unit is connected with an overflow pipe, and the outlet end of the overflow pipe is positioned; the lower end of the sand separator is connected to the sampling groove through a sand settling pipe, a second rubber pipe valve is mounted on the sand settling pipe, the upper end of the sand separator is connected to the single-layer thickener through a mud overflow pipe, an overflow weir is arranged at the upper end of the single-layer thickener, an overflow groove is arranged on one side of the overflow weir, and the lower end of the overflow groove is connected with an overflow water pipe; the lower end of the overflow water pipe is provided with a reverse water pump groove, one end of the reverse water pump groove is connected to the lower end of the sand separator through a reverse water pump, a one-way valve is arranged on a pipeline between the reverse water pump and the sand separator, and the other end of the reverse water pump groove is provided with an overflow water outlet; a rake is arranged inside the single-layer thickener, and a first rubber tube valve is arranged at the outlet end of the single-layer thickener.

As a further scheme of the invention: the overflow water of the single-layer thickener is discharged into a hydraulic cyclone group through a pipeline; the overflow water of the single-layer thickener is discharged into a grading pump tank through a pipeline.

As a further scheme of the invention: the upper end of the sand separator is provided with a forced feeding and discharging device, the outlet end of the overflow pipe is positioned right above the forced feeding and discharging device, and the lower end of the forced feeding and discharging device is conical.

As a further scheme of the invention: the sand separator is provided with a plurality of sand separators which are used in parallel.

As a further scheme of the invention: the sand separator is conical, the tip of the sand separator faces downwards, and the cone angle of the conical part is controlled to be 50-60 degrees.

An ore grinding method comprises the following steps:

the ore pulp C enters a grading pump tank from an ore supply pipeline of a preceding stage working section, is pressurized by a grading pump, is conveyed to a swirler, and is graded by the swirler; after the swirler grades the ore pulp C, the ore pulp C is divided into two parts: one part of coarse particle ore, namely settled sand, enters a ball mill from an ore inlet pipe for further grinding, and is discharged into a grading pump tank from an ore discharge pipe, and the other part of ore pulp A enters a sand separator from an overflow pipe;

secondly, an upward water flow layer is provided at the lower part of the sand separator by a reverse water pump, when the gravity of coarse particles is greater than the upward water flow force, the reverse water flow is deposited downwards and converged into an ore inlet pipe through a sand settling pipe for further regrinding treatment; the mineral with the gravity smaller than the ascending water power, namely the ore pulp B, is discharged into the single-layer thickener for concentration through the sludge overflow pipe, the overflow water of the single-layer thickener is discharged through the overflow water pipe, and the filtrate obtained after the concentrated ore pulp is treated by the next procedure is returned into the single-layer thickener through the water return pipe.

Compared with the prior art, the invention has the beneficial effects that:

the ore grinding system and the method thereof have reasonable design, the sand separator is added, an externally adjustable ascending water flow acting force is applied by utilizing different sedimentation speeds of particles with different particle sizes in water, and when the acting force is greater than the sedimentation force of qualified particles, the particles float upwards and are discharged through overflow; when the settling force of the coarse particles is smaller than the settling force of the coarse particles, the particles are settled, discharged from the bottom of the sand separator, and returned to the previous-stage system again for reprocessing, so that the monomer dissociation of the large-particle gold is ensured; the use method is simple, reduces the waste of resources and is more environment-friendly.

Drawings

Fig. 1 is a schematic structural diagram of an ore grinding system and a method thereof.

Wherein: 1-ball mill; 2-an ore feeding pipe; 3, discharging ore pipes; 4-a graded pump tank; 5-a classification pump; 6-second floor; 7-hydrocyclone group; 8-a hydrocyclone; 9-an overflow pipe; 10-pressure gauge; 11-pulp A; 12-a mud overflow pipe; 13-a sand separator; 14-a sand settling pipe; 15-overflow water pipe; 16-an overflow launder; 17-a reverse water pump; 18-a reverse water pump tank; 19-rake; 20-ore pulp B; 21-single layer thickener; 22-a weir; 23-pulp C; 24-settling sand; 26-overflow water of the single-layer thickener; 27-concentrating the pulp; 28-overflow water; 29-a pre-stage workshop section ore supply pipeline; 30-a sampling tank; 31-a water return pipe; 32-a one-way valve; 33-a first rubber tube valve; 34-a second rubber tube valve; 35-forced supply and discharge device.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Referring to fig. 1, an ore grinding system and a method thereof includes a ball mill 1, a hydrocyclone unit 7, a sand separator 13 and a single-layer thickener 21; the ore supply pipeline 29 of the preceding stage section is a pipeline for supplying ore to the system at the preceding stage, ore pulp C23 enters the classifying pump groove 4 from the ore supply pipeline 29 of the preceding stage section, one end of the classifying pump groove 4 is connected to the hydrocyclone group 7 through the classifying pump 5, the hydrocyclone group 7 comprises a plurality of cyclones 8, the upper end of the hydrocyclone group 7 is provided with a pressure gauge 10, the classifying pump 5 is used for pressurizing, the ore pulp C23 is sent to the cyclones 8, the ore pulp is classified through the cyclones 8, one end of the hydrocyclone group 7 is connected to the ball mill 1 through the ore inlet pipe 2, the other end of the ball mill 1 is connected to the classifying pump groove 4 through the ore discharge pipe 3, the classifying pump groove 4, the classifying pump 5 and the ball mill 1 are all arranged below the second floor 6, the branch pipe of the ore inlet pipe 2 is connected to the sampling groove 30 above the second floor 6, the other end of the hydrocyclone group 7 is connected to the overflow pipe 9, the, after the cyclone 8 has classified the slurry C23, the slurry C23 is divided into two parts: a part of coarse particle ore (settled sand 24) enters the ball mill 1 from the ore inlet pipe 2 for further grinding and is discharged into the grading pump tank 4 from the ore discharge pipe 3; the other part of the ore pulp A11 enters a sand separator 13 from an overflow pipe 9, the lower end of the sand separator 13 is connected to a sampling groove 30 through a sand settling pipe 14, a second rubber pipe valve 34 is installed on the sand settling pipe 14, an upward water flow layer is provided by a reverse water pump 17 at the lower part of the sand separator 13, when the gravity of coarse particles (unqualified particles) is larger than the upward water flow force, the reverse water flow is deposited downwards and is converged into an ore inlet pipe 2 through the sand settling pipe 14 for further regrinding treatment; the sand separator 13 can be sized according to the treatment capacity, the larger the treatment capacity is, the larger the diameter of the sand separator is, and a plurality of sand separators 13 can also be used in parallel, wherein the sand separator 13 is conical, the tip of the sand separator is downward, and the cone angle of the conical part is generally controlled to be 50-60 degrees; the upper end of the sand separator 13 is connected to a single-layer thickener 21 through a sludge overflow pipe 12, the upper end of the single-layer thickener 21 is provided with an overflow weir 22, one side of the overflow weir 22 is provided with an overflow trough 16, the lower end of the overflow trough 16 is connected with an overflow water pipe 15, mineral (ore pulp B20) with gravity smaller than ascending water power is discharged into the single-layer thickener 21 through the sludge overflow pipe 12 for concentration to provide raw materials for the next stage, the overflow water 26 of the single-layer thickener is discharged from the overflow water pipe 15, the overflow water 26 of the single-layer thickener can be discharged into a hydraulic cyclone group 7 through a pipeline, the overflow water 26 of the single-layer thickener can also be discharged into a grading pump tank 4 through a pipeline, and the overflow water 26 of the single-layer thickener not only can be used for regulating the settled sand 24 in the hydraulic cyclone group 7, but also can be used for regulating the; the lower end of the overflow water pipe 15 is provided with a reverse water pump groove 18, one end of the reverse water pump groove 18 is connected to the lower end of the sand separator 13 through a reverse water pump 17, a one-way valve 32 is installed on a pipeline between the reverse water pump 17 and the sand separator 13, the one-way valve 32 can prevent ore pulp from flowing backwards after the reverse water pump 17 fails, the other end of the reverse water pump groove 18 is provided with an overflow water outlet, overflow water 28 flows out of the reverse water pump groove 18, and the overflow water 28 can be used for supplying water and mixing pulp for a previous stage of process; a rake 19 is arranged in the single-layer thickener 21, concentrated ore pulp 27 flows out from an outlet at the lower end of the single-layer thickener 21, a first rubber tube valve 33 is arranged at the outlet end of the single-layer thickener 21, and the first rubber tube valve 33 and a second rubber tube valve 34 are used for controlling an ore drawing switch or flow; the filtrate of the concentrated ore pulp 27 after the treatment of the next process is returned to the single-layer thickener 21 through a return pipe 31, so as to ensure the normal liquid level in the system; the use frequency and the flow rate of the reverse water pump 17 can be adjusted according to the production requirement and the specific gravity of minerals, so that the overflow products in the sand separator do not contain coarse particles; the upper end of the sand separator 13 is provided with a forced feeding and discharging device 35, the outlet end of the overflow pipe 9 is positioned right above the forced feeding and discharging device 35, the lower end of the forced feeding and discharging device 35 is conical, ore pulp enters the forced feeding and discharging device 35 through the overflow pipe 9 and is discharged from the periphery of the forced feeding and discharging device 35, the ore feeding area is increased, namely the separation area of coarse particles and fine particles is increased, and the lower conical body plays a role in forced ore discharging.

The working principle of the invention is as follows: the hydrocyclone group 7 is a grading device, and is required to be 90% -93% through a 200-400 mesh sieve, so that the product is considered to be qualified, if the fineness is further improved, the production treatment amount in unit time is influenced, the service life of the device is also reduced, the consumption of various materials is continuously increased, and the production unit is uneconomical; however, through experiments, the gold content of the remaining 7% -10% of coarse ores can reach about 150-650 g/ton, some concentrates are even higher, coarse particles are limited by leaching time or are affected by wrapping gold (gold is not subjected to monomer dissociation) in a leaching system, and finally the coarse particles cannot be leached completely and enter the next step, so that a certain amount of gold contained in tailings is lost, and the recovery rate cannot be improved. In order to sort out the coarse gold particles mixed in the qualified products, a sand separator 13 is added, the size of upward acting force is changed by designing the size of ascending water flow, so that the ore pulp products are separated, the truly qualified products enter a next-level flow, the settling force of the unqualified products is large due to large particles, and when the settling force is larger than the acting force of the upward water flow, the coarse gold particles can be settled and return to the ball mill as unqualified ores for regrinding. The sand separator 13 is used for inspection and grading and is responsible for re-inspection of overflow products to ensure that the content of unqualified products in the products is reduced to the maximum extent; the coarser the preceding stage, the higher the operating efficiency of the sand separator 13 and the faster the coarse particles settle. Because the sand separator 13 has simple structure, needs no power under the premise of large treatment capacity, in order to achieve the effect of reinspection, a plurality of sand separators 13 can be used in parallel, and the granularity of an overflow product reaches below 0.074 mu m, thereby meeting the design requirement.

The ore grinding system and the method thereof have reasonable design, the sand separator 13 is added, the externally adjustable ascending water flow acting force is applied by utilizing the different sedimentation speeds of the particles with different grain sizes in water, when the acting force is greater than the sedimentation force of the qualified particles, the particles float upwards and are discharged through overflow; when the settling force of the coarse particles is smaller than the settling force of the coarse particles, the particles are settled, discharged from the bottom of the sand separator, and returned to the previous-stage system again for reprocessing, so that the monomer dissociation of the large-particle gold is ensured; the use method is simple, reduces the waste of resources and is more environment-friendly.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. An ore grinding system is characterized by comprising a ball mill (1), a hydrocyclone unit (7), a sand separator (13) and a single-layer thickener (21); the outlet end of an ore supply pipeline (29) at the preceding stage section is positioned above a grading pump tank (4), one end of the grading pump tank (4) is connected to a hydrocyclone group (7) through a grading pump (5), the hydrocyclone group (7) comprises a plurality of cyclones (8), a pressure gauge (10) is installed at the upper end of the hydrocyclone group (7), one end of the hydrocyclone group (7) is connected to a ball mill (1) through an ore inlet pipe (2), the other end of the ball mill (1) is connected to the grading pump tank (4) through an ore discharge pipe (3), the grading pump tank (4), the grading pump (5) and the ball mill (1) are all arranged below a second floor (6), and branch pipes of the ore inlet pipe (2) are connected to a sampling tank (30) above the second floor (6), the other end of the hydrocyclone unit (7) is connected with an overflow pipe (9), and the outlet end of the overflow pipe (9) is positioned above the sand separator (13); the lower end of the sand separator (13) is connected to the sampling groove (30) through a sand settling pipe (14), a second rubber pipe valve (34) is installed on the sand settling pipe (14), the upper end of the sand separator (13) is connected to the single-layer thickener (21) through a mud overflow pipe (12), an overflow weir (22) is arranged at the upper end of the single-layer thickener (21), an overflow groove (16) is arranged on one side of the overflow weir (22), and an overflow water pipe (15) is connected to the lower end of the overflow groove (16); a reverse water pump groove (18) is formed in the lower end of the overflow water pipe (15), one end of the reverse water pump groove (18) is connected to the lower end of the sand separator (13) through a reverse water pump (17), a one-way valve (32) is installed on a pipeline between the reverse water pump (17) and the sand separator (13), and an overflow water outlet is formed in the other end of the reverse water pump groove (18); a rake (19) is arranged in the single-layer thickener (21), a first rubber tube valve (33) is arranged at the outlet end of the single-layer thickener (21), and overflow water (26) of the single-layer thickener is discharged into the hydrocyclone group (7) through a pipeline; overflow water (26) of the single-layer thickener is discharged into the grading pump groove (4) through a pipeline, a forced feeding and discharging device (35) is arranged at the upper end of the sand separator (13), the outlet end of the overflow pipe (9) is positioned right above the forced feeding and discharging device (35), and the lower end of the forced feeding and discharging device (35) is conical.

2. The ore grinding system according to claim 1, characterized in that the sand separator (13) is provided in plurality, and a plurality of sand separators (13) are used in parallel.

3. The ore grinding system according to claim 1, characterized in that the sand separator (13) is conical with a tip downward and the cone angle of the conical part is controlled to be 50-60 °.

4. A grinding method implemented by using the grinding system according to any one of claims 1 to 3, characterized by comprising the steps of:

firstly, ore pulp C (23) enters a classifying pump groove (4) from an ore supply pipeline (29) of a preceding stage working section, is pressurized by a classifying pump (5), is conveyed to a swirler (8) and is classified by the swirler (8); after the cyclone (8) grades the ore pulp C (23), the ore pulp C (23) is divided into two parts: one part of coarse particle ore, namely settled sand (24), enters the ball mill (1) through the ore inlet pipe (2) for further grinding, and is discharged into the classifying pump groove (4) through the ore discharge pipe (3), and the other part of ore pulp A (11) enters the sand separator (13) through the overflow pipe (9);

secondly, an upward water flow layer is provided at the lower part of the sand separator (13) by a reverse water pump (17), when the gravity of coarse particles is larger than the upward water flow force, the reverse water flow is deposited downwards and converged into the ore inlet pipe (2) through a sand settling pipe (14) for further regrinding treatment; the ore with the gravity smaller than the ascending water power, namely the ore pulp B (20), is discharged into the single-layer thickener (21) through the sludge overflow pipe (12) for concentration, the overflow water (26) of the single-layer thickener is discharged through the overflow water pipe (15), and the filtrate obtained after the concentrated ore pulp (27) is processed by the next procedure is returned into the single-layer thickener (21) through the return water pipe (31).