Beneficiation method for stably improving production indexes during simultaneous beneficiation of various raw iron ores with different properties

Abstract

The invention discloses a beneficiation method for stably improving the production index of various raw iron ores with different properties during simultaneous beneficiation. The method comprises the following steps that raw iron ore is ground through a semi-autogenous mill and then enters a GK screen, oversize products are subjected to waste throwing through a magnetic roller, and throwing concentrate is returned to the semi-autogenous mill to be ground again; conveying undersize ore pulp of the GK screen to a cyclone group for classification through a slurry pump, enabling settled sand of a cyclone to enter a ball mill for regrinding, conveying an ore grinding product of the ball mill to the cyclone group for classification through the slurry pump, and conveying cyclone overflow with the fineness of-200 meshes accounting for 73-78% to a first-section weak magnetic field through the slurry pump; the first-section low-intensity magnetic concentrate is subjected to third-section ore grinding through a tower mill and is separated through a low-intensity magnetic separator and a full-automatic elutriation machine to obtain magnetite concentrate, and the first-section high-intensity magnetic concentrate is subjected to second-section ore grinding, high-intensity magnetic separation and gravity separation to obtain hematite concentrate. By means of the beneficiation method, the production index can be stably improved when multiple raw iron ores with different properties are selected at the same time, the production cost is reduced, and the profit is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and in particular relates to an ore dressing method for stably improving production indicators when a plurality of iron ores with different properties are selected simultaneously. Background Art

[0002] The iron series ores of the Dahongshan No. 3 concentrator include open-pit lava iron ore, underground low-grade iron ore and Erdaohe iron ore. There are many types, and the supply of each ore is unstable, and the supply ratio often fluctuates, resulting in frequent fluctuations in iron series beneficiation indicators, and the iron ore processing capacity, iron concentrate grade, and iron tailings grade fluctuate. The present invention aims to provide a beneficiation method that can stably improve the production indicators when multiple iron ores of different properties are selected at the same time, so as to stabilize and improve the iron ore processing capacity, concentrate quality, and concentrate recovery rate. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a mineral processing method for stably improving the production index when a variety of iron ores with different properties are selected at the same time.

[0004] The object of the present invention is achieved by a ore dressing method for stably improving the production index when multiple iron ores with different properties are selected at the same time, which is achieved by the following steps: 1) After being ground by the semi-autogenous mill, the iron ore enters the GK screen, the material on the screen is discarded by the magnetic drum, and the discarded concentrate returns to the semi-autogenous mill for re-grinding; 2) The slurry under the GK screen is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone sand is sent to the ball mill for re-grinding. The ball mill grinding product is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone overflow with a fineness of -200 mesh accounting for 73-78% is transported to a weak magnetic section through a slurry pump; 3) The first stage weak magnetic tailings enter the first stage slag screen, the undersize of the slag screen enters the first stage strong magnetic, the oversize of the slag screen and the first stage weak magnetic concentrate enter the grinding and classification system of three tower mills; the first stage weak magnetic concentrate is separated by three stages of tower mill grinding, weak magnetic separator and fully automatic washing machine to obtain magnetite concentrate, and the first stage strong magnetic concentrate is separated by two stages of grinding, strong magnetic separation and gravity separation to obtain hematite concentrate; 4) Two full-disk tailings recovery machines are used to recover magnetite from the tailings of the panning machine and feed it into the tower mill grinding and grading system and subsequent re-grinding and re-selection processes.

[0005] The beneficial effects of the present invention are as follows: the ore dressing method of the present invention can stably improve the production index when a variety of iron ores with different properties are selected at the same time, reduce production costs and increase profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is the iron series production flow chart of the former Dahongshan No. 3 Concentrator; Figure 2This is the iron series production flow chart of the present invention when the underground iron ore accounts for less than 50%; Figure 3 This is the iron series production flow chart of the present invention when the underground iron ore accounts for more than 50%; Figure 4 This is the flow chart of the sand return from the semi-autogenous grinding mill of the third iron ore concentrator. DETAILED DESCRIPTION

[0007] The present invention is further described below in conjunction with the embodiments and drawings, but the present invention is not limited in any way. Any changes made based on the present invention belong to the protection scope of the present invention.

[0008] The present invention provides a ore dressing method for stably improving the production index when multiple iron ores with different properties are selected simultaneously, which is achieved by the following steps: 1) After being ground by the semi-autogenous mill, the iron ore enters the GK screen, the material on the screen is discarded by the magnetic drum, and the discarded concentrate returns to the semi-autogenous mill for re-grinding; 2) The slurry under the GK screen is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone sand is sent to the ball mill for re-grinding. The ball mill grinding product is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone overflow with a fineness of -200 mesh accounting for 73-78% is transported to a weak magnetic section through a slurry pump; 3) The first stage of weak magnetic tailings enters a first stage of slag screen, the undersize of the slag screen enters a first stage of strong magnetic, the oversize of the slag screen and the first stage of weak magnetic concentrate enter the grinding and grading system of three tower mills; the first stage of weak magnetic concentrate is separated by tower mill grinding, weak magnetic separator and fully automatic washing machine to obtain magnetite concentrate, and the first stage of strong magnetic concentrate is separated by strong magnetic separation and gravity separation to obtain hematite concentrate; 4) Two full-disk tailings recovery machines are used to recover magnetite from the tailings of the panning machine and feed it into the tower mill grinding and grading system and subsequent re-grinding and re-selection processes.

[0009] In step 3), the slurry of the slag screen oversize and the first-stage weak magnetic concentrate ground by three tower mills is transported to the Φ350*12 hydrocyclone group for classification through a slurry pump, and the hydrocyclone overflow with a fineness of -325 mesh accounting for 86-90% flows by gravity to the second-stage weak magnetic concentrate, and the hydrocyclone group sand settling returns to the tower mill for re-grinding; the second-stage weak magnetic tailings flows by gravity to the 6400m² inclined plate thickener, and the second-stage weak magnetic concentrate flows by gravity into the third-stage weak magnetic concentrate; the third-stage weak magnetic tailings flows by gravity to the tower mill grinding and grading system for re-grinding, and the third-stage weak magnetic concentrate enters the elutriator; the elutriator concentrate is an iron concentrate with a grade of more than 66%, that is, a magnetite concentrate, and the elutriator tailings enter the 1# full-disk tailings recovery machine.

[0010] The tailings recovered by the 1# all-disk tailings recovery machine enter the 2# all-disk tailings recovery machine for scanning and selection. The concentrates of the 1# and 2# all-disk tailings recovery machines are returned to the tower mill grinding and grading system for regrinding. The tailings of the 2# all-disk tailings recovery machine flow by gravity to the ditch for disposal.

[0011] In step 3), the first-stage strong magnetic concentrate is transported to the 6400m² inclined plate thickening box by a slurry pump, the overflow of the inclined plate is circulating water, and the bottom flow of the inclined plate is transported to the full-disk disk tailings recovery machine by a slurry pump. The concentrate of the full-disk disk tailings recovery machine flows by gravity to the tower mill grinding and classification system and the subsequent process re-grinding and re-selection. The tailings of the full-disk disk tailings recovery machine that do not contain magnetic iron enter the second-stage slag screen, and the material on the slag screen flows by gravity into the tower mill grinding and classification system, and the material under the slag screen enters the second-stage strong magnetic; the second-stage strong magnetic concentrate flows by gravity into the third-stage strong magnetic re-selection, and the second-stage strong magnetic tailings flows by gravity into the ditch for tailings disposal; the third-stage strong magnetic tailings are transported to the shaking table for selection by a slurry pump, and the shaking table tailings are directly discarded. The third-stage strong magnetic concentrate and the shaking table concentrate are combined to recover the iron concentrate, namely the hematite concentrate. According to the sales requirements of iron ore concentrate grade above 64% and silicon dioxide content below 6.00%, the gate valve of the recovered iron ore concentrate pipeline can be controlled to incorporate an appropriate amount of recovered iron ore into the iron ore concentrate.

[0012] Use a full disk tailings recovery machine to recover magnetic iron before the second stage of strong magnetization.

[0013] In step 3), when the proportion of underground ore exceeds 50%, the first stage of strong magnetic concentrate strong magnetic separation adopts a process of one roughing selection, one fine selection and one sweeping selection; when the proportion of underground ore is less than 50%, the strong magnetic separation adopts a process of one roughing selection and two fine selection.

[0014] In step 1), the waste rock is thrown into the waste rock bin and transported by vehicles for external sale.

[0015] In step 1), the semi-autogenous mill model is MZS8848.

[0016] In step 2), the cyclone group is a Φ660*12 cyclone group, and the ball mill is a MQY6095 ball mill. Example 1 Ore dressing system transformation 1. There are three belts for the GK screening return sand belts of the iron series semi-autogenous grinding mill, namely, 7#, 8# and 9#. The first roller of the 7# belt machine is replaced with a magnetic pulley (diameter 500mm, magnetic field strength 550mT), and the ore funnel under the 7# belt machine and the 8# belt machine is transformed into a double-channel funnel. The cast concentrate enters the 8# belt, and then enters the 9# belt to return to the semi-autogenous grinding mill for re-grinding; newly built 1# and 2# belts and waste rock bins are built, and the cast waste enters the 1# belt, and then enters the waste rock bin through the 1# belt, and finally discharges the material to the transport vehicle for external sale through the 2# belt at the bottom of the waste rock bin. Figure 4 shown.

[0017] 2. Through the transformation of the activity process, the first stage of strong magnetic concentrate (mainly hematite) is introduced into the 11# pump pool of the melting furnace, and then pumped into the 6400m² inclined plate thickener through the 11# pump pool. The bottom flow of the inclined plate is pumped to the second stage of strong magnetic front slag screen through the bottom flow pump. After the transformation, the first stage of strong magnetic concentrate no longer passes through the 3# tower mill for grinding and classification. The first stage of weak magnetic concentrate is evenly fed to the 3 tower mill pump pools through the ore separation box and enters the 3 tower mill grinding and classification system, so that the tower mill (third stage grinding) only processes the first stage of weak magnetic concentrate (mainly magnetite). For details, see Figure 2 .

[0018] 3. Add two HLW1500-12 full disk tailings recovery machines to process the tailings from the washing machine. The specific parameters of the HLW1500-12 full disk tailings recovery machine are: field strength 450mT, disk diameter Φ1500mm, number of disks 12, processing particle size 0-3mm, input voltage 380V, 50Hz, motor power 11kW, total weight 6t, and overall dimensions 3595 (L) × 2755 (W) × 1841 (H) mm.

[0019] 4. The pipeline from the second stage of strong magnetic to the third stage of strong magnetic is transformed. The original second stage of strong magnetic tailings is directly discarded. The second stage of strong magnetic tailings pipe is equipped with a gate valve and pipeline, and introduced into the third stage of strong magnetic feed box. The third stage of strong magnetic can be used for concentration or scavenging operations. In daily production, it can be adjusted according to the original ore situation. Figure 3 .

[0020] 5. Add 30 double-layer shaking tables to process the three-stage strong magnetic tailings. The double-layer shaking table concentrate is incorporated into the recovered iron concentrate, and the double-layer shaking table tailings are directly discarded. The parameters of the double-layer shaking table are: stroke 11~16mm, stroke 300~400 times / min, bed slope 1°~4.5°, dry weight of ore feed 48~55 t / unit.day, motor power 1.5KW. See details Figure 3 .

[0021] 6. A new full-disk tailings recovery magnetic separator is added, which is installed on the second-stage strong magnetic front slag screen platform to remove magnetic minerals in advance. The concentrate of the tailings recovery magnetic separator enters the tower mill grinding and grading system, and the tailings enter the slag screen, and then enter the subsequent strong magnetic and shaking table separation process. Pre-removal of magnetic minerals creates powerful conditions for subsequent strong magnetic and shaking table separation.

[0022] Example 2 Taking January to November 2024 as an example, the proportion of iron ore in the underground mine of the iron series accounts for 41.84% of the total ore, the iron grade of the ore is 20.60%, the magnetic iron grade of the ore is 8.80%, and the magnetic iron occupancy rate of the ore is 42.42%. The beneficiation method is as follows: The ore from the mining area is transported to the coarse crushing station by car. After the ore is coarsely crushed to -250mm, it is transported to the lava ore bin by belt conveyor. The iron ore in the lava ore bin is ground by MZS8848 semi-autogenous mill and then enters the GK screen. The screened material is discarded by the magnetic drum. The discarded waste rock enters the waste rock bin and is transported to the outside by vehicle for sale. The discarded concentrate (ore) is returned to the MZS8848 semi-autogenous mill for re-grinding. The material under the GK screen is transported to the Φ660*12 cyclone group for grading by a slurry pump. The cyclone sand is sent to the MQY6095 ball mill for re-grinding. The grinding product of the MQY6095 ball mill is transported to the Φ660 by a slurry pump. *12 cyclone group classification, cyclone overflow (-200 mesh accounting for 75.68%) is transported to the first stage of weak magnetic through a slurry pump; the first stage of weak magnetic tailings enters the first stage of slag screen, the slag screen underscreen enters the first stage of strong magnetic, the slag screen overscreen and the first stage of weak magnetic concentrate enter the grinding and classification system of 3 tower mills; Φ350*12 cyclone group sand set returns to 3 tower mills for re-grinding, the tower mill grinding products are transported to the Φ350*12 cyclone group classification through a slurry pump, and the cyclone overflow (-325 mesh accounting for 86.09%) flows by gravity to the second stage of weak magnetic; the second stage of weak magnetic tailings flows by gravity to the 6400m² inclined plate thickener, the second stage of weak magnetic concentrate The ore flows by gravity into the three-stage weak magnetic field; the three-stage weak magnetic tailings flow by gravity to the tower mill grinding and classification system for regrinding, and the three-stage weak magnetic concentrate enters the panning machine; the panning machine concentrate is an iron concentrate with an iron grade of 66.68%, and the panning machine tailings enter the 1# full-disk type tailings recovery machine; the 1# full-disk type tailings recovery machine tailings enter the 2# full-disk type tailings recovery machine for scavenging, and the 1# and 2# full-disk type tailings recovery machine concentrates return to the tower mill grinding and classification system for regrinding, and the 2# full-disk type tailings recovery machine tailings flow by gravity to the ditch for tailings disposal; the first stage strong magnetic concentrate is transported to the 6400m² inclined plate thickening box by a slurry pump, and the inclined plate overflow is circulating water, and the inclined plate The underflow is pumped to the full-disk magnetic tailings recovery machine through a slurry pump, and the concentrate of the full-disk magnetic tailings recovery machine flows by gravity to the tower mill grinding and grading system and the subsequent process of regrinding and re-selection. The tailings of the full-disk magnetic tailings recovery machine (excluding magnetic iron) enter the second-stage slag screen, and the material above the slag screen flows by gravity into the tower mill grinding and grading system, and the material under the slag screen enters the second-stage strong magnetic; the second-stage strong magnetic concentrate flows by gravity into the third-stage strong magnetic re-selection, and the second-stage strong magnetic tailings flows by gravity into the ditch for tailings disposal; the third-stage strong magnetic tailings are pumped to the shaking table for selection through a slurry pump, and the shaking table tailings are directly discarded, and the third-stage strong magnetic concentrate and the shaking table concentrate are combined into a recovered iron concentrate with an iron grade of 36.89%. According to the sales requirements of iron ore concentrate with a grade of more than 64% and a silicon dioxide content of less than 6.00%, the gate valve of the recovered iron ore concentrate pipeline can be controlled to incorporate an appropriate amount of recovered iron ore into the iron ore concentrate; from January to November 2024, 44,700 tons of recovered iron ore concentrate with an iron grade of 36.89% and 655,400 tons of panning machine concentrate with an iron grade of 66.68% were mixed into 700,100 tons of iron ore concentrate with an iron grade of 64.78% and a silicon dioxide content of 5.95% for internal sales, and 82,900 tons of recovered iron ore concentrate with an iron grade of 36.89% were produced for external sales. Figure 2 .

[0023] Example 3 Taking 2023 as an example, the proportion of iron-series underground iron ore accounts for 66.51% of the total ore, the iron grade of the ore is 21.97%, the magnetic iron grade of the ore is 9.54%, and the magnetic iron occupancy rate of the ore is 43.42%. The second and third stage strong magnetic processes in the ore dressing method are different from those in Example 2, and the remaining processes are the same as in Example 2, as follows: the second stage strong magnetic tailings flow into the third stage strong magnetic by gravity, and the third stage strong magnetic tailings are pumped to the shaking table for selection through a slurry pump, and the shaking table tailings are directly discarded, and the second and third stage strong magnetic concentrates and the shaking table concentrates are combined into a recovered iron concentrate with an iron grade of 38.50%. According to the sales requirements of iron concentrate grade above 64% and silicon dioxide content below 6.00%, the gate valve of the recovered iron concentrate pipeline can be controlled, and an appropriate amount of recovered iron concentrate can be incorporated into the iron concentrate ( Figure 3 ); In 2023, 52,400 tons of recovered iron concentrate with an iron grade of 38.50% and 779,000 tons of panning machine concentrate with an iron grade of 66.90% will be mixed into 831,400 tons of iron concentrate with an iron grade of 65.11% and a silicon dioxide content of 5.76% for sale to internal units, and another 75,000 tons of recovered iron concentrate with an iron grade of 38.50% will be produced for external sale.

[0024] The difference between the ore dressing process of the present invention and the original ore dressing process is shown in Table 1.

[0025] Table 1 Comparison between the original beneficiation process and the current beneficiation process Compared with the original mineral processing technology, the mineral processing method of the present invention has the following advantages: (1) Since the adoption of the SAG mill return sand selection method, the SAG mill return sand selection waste rock yield has been above 1.5%, the iron grade of the selected waste rock is below 12.50%, and the annual output is above 60,000 t / a; the subsequent process equipment load and energy consumption have been effectively reduced. According to the subsequent grinding, sorting, tailings concentration and transportation process cost of 28 yuan / t, the total production cost has been reduced by: 60,000 t / a × 28 yuan / t = 1.68 million yuan; at the same time, the waste rock selection income has been increased by 60,000 t / a × 3 yuan / t = 180,000 yuan, generating a total economic benefit of 1.86 million yuan.

[0026] (2) The iron series uses a three-mill grinding and grading system to process magnetite. The grinding fineness is increased from 80%-83% at -325 mesh to 86%-90% at -325 mesh, and the grade of magnetite concentrate is increased from 64.00% to over 66.00%.

[0027] (3) The iron grade of the tailings from the washing machine is between 15% and 25%. Two full-disk tailings recovery machines are used to process the tailings from the washing machine in a one-roughing and one-sweeping process. The concentrates from the two full-disk tailings recovery machines are returned to the three-stage grinding, grading and separation system for re-grinding and re-separation. Finally, the tailings from the full-disk tailings recovery machines have an iron grade of less than 11% and can be directly discharged.

[0028] (4) After adding a double-layer shaking table to treat the strong magnetic tailings, the double-layer shaking table concentrate yield was 0.8%, and the annual increase in shaking table concentrate with an iron grade of more than 35% was 32,000 tons.

[0029] (5) After adding a full-disk tailings recovery machine to recover magnetic iron before the second stage of strong magnetic field, there is no magnetic agglomeration and blockage on the shaking table surface, and there is no magnetic iron in the total tailings.

[0030] (6) After improving the iron series production process according to the above measures, the daily production process was adjusted in time according to the raw ore, and the iron grade of tailings was reduced from below 11.00% to below 10.00% while ensuring that the grade of recovered iron concentrate (mainly hematite, also known as "hematite concentrate") reached more than 35%. According to the iron series, 4 million tons of raw iron ore was processed annually, and 88,000 tons of recycled iron concentrate with a grade of 35% could be produced. The waste rock disposal increased by 60,000 tons, the raw ore processing cost was reduced by RMB 1.68 million, the tax-exclusive sales of waste rock disposal and recovered iron concentrate increased by RMB 12.6037 million, and the profit increased by RMB 6.4665 million.

Claims

1. A ore dressing method for stably improving the production index when multiple iron ores with different properties are selected at the same time, characterized in that: To do this, follow these steps: 1) After being ground by the semi-autogenous mill, the iron ore enters the GK screen, the material on the screen is discarded by the magnetic drum, and the discarded concentrate returns to the semi-autogenous mill for re-grinding; 2) The slurry under the GK screen is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone sand is sent to the ball mill for re-grinding. The ball mill grinding product is transported to the hydrocyclone group for classification through a slurry pump. The hydrocyclone overflow with a fineness of -200 mesh accounting for 73-78% is transported to a weak magnetic section through a slurry pump; 3) The first stage of weak magnetic tailings enters a first stage of slag screen, the undersize of the slag screen enters a first stage of strong magnetic, the oversize of the slag screen and the first stage of weak magnetic concentrate enter the grinding and grading system of three tower mills; the first stage of weak magnetic concentrate is separated by tower mill grinding, weak magnetic separator and fully automatic washing machine to obtain magnetite concentrate, and the first stage of strong magnetic concentrate is separated by strong magnetic separation and gravity separation to obtain hematite concentrate; 4) Two full-disk tailings recovery machines are used to recover magnetite from the tailings of the panning machine and feed it into the tower mill grinding and grading system and subsequent re-grinding and re-selection processes.

2. The ore dressing method according to claim 1, characterized in that: In step 3), the slurry of the slag screen oversize and the first-stage weak magnetic concentrate ground by three tower mills is transported to the Φ350*12 hydrocyclone group for classification through a slurry pump, and the hydrocyclone overflow with a fineness of -325 mesh accounting for 86-90% flows by gravity to the second-stage weak magnetic concentrate, and the hydrocyclone group sand settling returns to the tower mill for re-grinding; the second-stage weak magnetic tailings flows by gravity to the 6400m² inclined plate thickener, and the second-stage weak magnetic concentrate flows by gravity into the third-stage weak magnetic concentrate; the third-stage weak magnetic tailings flows by gravity to the tower mill grinding and grading system for re-grinding, and the third-stage weak magnetic concentrate enters the elutriator; the elutriator concentrate is an iron concentrate with a grade of more than 66%, that is, a magnetite concentrate, and the elutriator tailings enter the 1# full-disk tailings recovery machine.

3. The ore dressing method according to claim 2, characterized in that: The tailings recovered by the 1# all-disk tailings recovery machine enter the 2# all-disk tailings recovery machine for scanning and selection. The concentrates of the 1# and 2# all-disk tailings recovery machines are returned to the tower mill grinding and grading system for regrinding. The tailings of the 2# all-disk tailings recovery machine flow by gravity to the ditch for disposal.

4. The ore dressing method according to claim 2, characterized in that: In step 3), the first stage of strong magnetic concentrate is transported to the 6400m² inclined plate thickening box by a slurry pump. The overflow of the inclined plate is circulating water. The bottom flow of the inclined plate is transported to the full-disk tailings recovery machine by a slurry pump. The concentrate of the full-disk tailings recovery machine flows by gravity to the tower mill grinding and classification system and the subsequent process of regrinding and reselection. The tailings of the full-disk tailings recovery machine that do not contain magnetic iron enter the second stage slag screen. The material on the slag screen flows by gravity into the tower mill grinding and classification system, and the material under the slag screen enters Two-stage strong magnetic; the two-stage strong magnetic concentrate flows by gravity into the three-stage strong magnetic re-selection, and the two-stage strong magnetic tailings flow by gravity into the ditch for tailings disposal; the three-stage strong magnetic tailings are sent to the shaking table for selection through a slurry pump, and the shaking table tailings are directly discarded. The three-stage strong magnetic concentrate and the shaking table concentrate are combined into the recovered iron concentrate, namely hematite concentrate; according to the sales requirements of iron concentrate grade above 64% and silicon dioxide content below 6.00%, the gate valve of the recovered iron concentrate pipeline can be controlled to incorporate an appropriate amount of recovered iron concentrate into the iron concentrate.

5. The ore dressing method according to claim 4, characterized in that: Use a full disk tailings recovery machine to recover magnetic iron before the second stage of strong magnetization.

6. The ore dressing method according to claim 1, characterized in that: In step 3), when the proportion of underground ore exceeds 50%, the first stage of strong magnetic concentrate strong magnetic separation adopts a process of one roughing selection, one fine selection and one sweeping selection; when the proportion of underground ore is less than 50%, the strong magnetic separation adopts a process of one roughing selection and two fine selection.

7. The ore dressing method according to claim 1, characterized in that: In step 1), the waste rock is thrown into the waste rock bin and transported by vehicles for external sale.

8. The ore dressing method according to claim 1, characterized in that: In step 1), the semi-autogenous mill model is MZS8848.

9. The ore dressing method according to claim 1, characterized in that: In step 2), the cyclone group is a Φ660*12 cyclone group, and the ball mill is an MQY6095 ball mill.

Images