A mineral processing method for steadily improving production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the beneficiation process.

Abstract

This invention discloses a mineral processing method for stabilizing and improving production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the beneficiation process. This invention optimizes the copper-series production process, adds a regrinding process for copper rough and concentrate, revitalizes the idle crushing system, and employs a combination of a strong and a weak reagent to synergistically enhance reagent adaptability, stabilize and optimize flotation indicators, and improve the processing capacity of copper-series raw ores and concentrate production capacity.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically relating to a mineral processing method for steadily improving production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the process. Background Technology

[0002] The copper flotation raw ore for the Dahongshan No. 3 beneficiation plant includes deep-seated copper-iron ore, shallow-seated copper-iron ore, and open-pit copper-iron ore. The supply of ore from each mine is unstable, and the proportion of ore supplied fluctuates frequently, leading to frequent fluctuations in copper flotation indicators. The copper concentrate grade ranges from as low as 16% to as high as 28%, and the silver content in the copper concentrate has not always met the pricing standards. Furthermore, the copper recovery rate also fluctuates. Previously, the open-pit copper-iron ore was directly fed into the semi-autogenous mill and subsequent grinding system of the No. 3 beneficiation plant after coarse crushing. However, due to the difficulty in grinding open-pit copper-iron ore, the processing capacity of the copper series has decreased, resulting in reduced copper and iron concentrate volumes. At the same time, the existing processing capacity of the copper series is already exceeding its design capacity and is nearing saturation; the existing production process is insufficient to increase capacity. To stabilize and improve copper flotation indicators, the copper series production process and flotation reagent system need to be optimized. Summary of the Invention

[0003] The purpose of this invention is to provide a mineral processing method that can stably improve the production indicators when multiple copper- and iron-bearing ores with different properties are simultaneously fed into the beneficiation process.

[0004] The objective of this invention is achieved by providing a mineral processing method that stably improves production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the beneficiation process, through the following steps:

[0005] (1) The copper-iron ore from open-pit lava is poured into the ore bin and fed to the jaw crusher by a vibrating feeder for the first stage of crushing to a particle size of less than 100 mm. After crushing, the material is sent to a vibrating screen for screening. The material on the screen is returned to the cone crusher by a return belt conveyor for the second stage of closed-circuit crushing to a particle size of less than 50 mm. It is then mixed with the copper-iron ore that has been crushed by underground and surface gyratory crushers and fed into a semi-autogenous mill for grinding. The slurry under the screen is fed into the pump pool.

[0006] (2) The reaction time between butylammonium black powder and slurry is relatively long. The dosing point of butylammonium black powder is moved to the pump pool before the hydrocyclone classification. 8 g / t of butylammonium black powder is added to the slurry in the pump pool to classify the slurry in the slurry pump pool. The resulting overflow from the classification enters the mixing tank for mixing and slurry preparation. 45-50 g / t of butyl sodium xanthate and 20 g / t of frother are added to the first mixing tank. The mixed slurry after slurry preparation is then subjected to the first copper roughing.

[0007] (3) The roughing concentrate is fed into a copper roughing concentrate regrinding system consisting of a 250KW vertical mill and a Φ350×3 hydrocyclone group. The grinding fineness is increased from 60% of -325 mesh to over 80% of -325 mesh. The overflow from the hydrocyclone of the regrinding system enters the third copper cleaning process to obtain copper concentrate. The first cleaning process uses 4 8m 3 The second flotation stage uses two 8m flotation machines. 3 The third flotation stage uses two 8m flotation machines. 3 Flotation machine;

[0008] (4) Copper roughing tailings enter the scavenging operation. Add 5g / t of butylammonium black powder, 35-40g / t of butyl sodium xanthate and 15g / t of frother to enter the scavenging operation. The scavenging concentrate is returned to the roughing operation. The scavenging tailings are subjected to three-stage grinding and classification and magnetic separation by the MQY5083 ball mill grinding system to obtain iron concentrate and final tailings. The MQY5083 ball mill in the grinding system is larger than the MQY3264 ball mill in the original process. In addition, there are two more weak magnetic separators in the first, second and third stages of the subsequent magnetic separation process than in the original process.

[0009] The beneficial effects of this invention are as follows: By optimizing the copper series production process, adding a copper rough concentrate regrinding process, revitalizing the idle crushing system, and using a strong reagent in combination with a weak reagent to complement each other, the invention enhances reagent adaptability, stabilizes and optimizes flotation indicators, and improves the processing capacity of copper series raw ore and concentrate production capacity. Attached Figure Description

[0010] Figure 1 This is the original copper series ore beneficiation process flow chart of the No. 3 beneficiation plant;

[0011] Figure 2 This is a flow chart of the copper series ore beneficiation process in the three-stage beneficiation plant of this invention. Detailed Implementation

[0012] The present invention will be further described below, but this is not intended to limit the invention in any way. Any modifications made based on the present invention are within the scope of protection of the present invention.

[0013] This invention discloses a mineral processing method for steadily improving production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the beneficiation process. The method is implemented through the following steps:

[0014] (1) The copper-iron ore from open-pit lava is poured into the ore bin and fed to the jaw crusher by a vibrating feeder for the first stage of crushing to a particle size of less than 100 mm. After crushing, the material is sent to a vibrating screen for screening. The material on the screen is returned to the cone crusher by a return belt conveyor for the second stage of closed-circuit crushing to a particle size of less than 50 mm. It is then mixed with the copper-iron ore that has been crushed by underground and surface gyratory crushers and fed into a semi-autogenous mill for grinding. The slurry under the screen is fed into the pump pool.

[0015] (2) The reaction time between butylammonium black powder and slurry is relatively long. The dosing point of butylammonium black powder is moved to the pump pool before the hydrocyclone classification. 8 g / t of butylammonium black powder is added to the slurry in the pump pool to classify the slurry in the slurry pump pool. The resulting overflow from the classification enters the mixing tank for mixing and slurry preparation. 45-50 g / t of butyl sodium xanthate and 20 g / t of frother are added to the first mixing tank. The mixed slurry after slurry preparation is then subjected to the first copper roughing.

[0016] (3) The roughing concentrate is fed into a copper roughing concentrate regrinding system consisting of a 250KW vertical mill and a Φ350×3 hydrocyclone group. The grinding fineness is increased from 60% of -325 mesh to over 80% of -325 mesh. The overflow from the hydrocyclone of the regrinding system enters the third copper cleaning process to obtain copper concentrate. The first cleaning process uses 4 8m 3 The second flotation stage uses two 8m flotation machines. 3 The third flotation stage uses two 8m flotation machines. 3 Flotation machine;

[0017] (4) Copper roughing tailings enter the scavenging operation. Add 5g / t of butylammonium black powder, 35-40g / t of butyl sodium xanthate and 15g / t of frother to enter the scavenging operation. The scavenging concentrate is returned to the roughing operation. The scavenging tailings are subjected to three-stage grinding and classification and magnetic separation by the MQY5083 ball mill grinding system to obtain iron concentrate and final tailings. The MQY5083 ball mill in the grinding system is larger than the MQY3264 ball mill in the original process. In addition, there are two more weak magnetic separators in the first, second and third stages of the subsequent magnetic separation process than in the original process.

[0018] In step (2), butyl sodium xanthate is used in combination with different collecting abilities.

[0019] The mass ratio of the more potent butyl sodium xanthate to the less potent butyl sodium xanthate is 1:1.

[0020] In step (3), the regrinding system consists of a 250KW vertical mill and a Φ350×3 hydrocyclone assembly.

[0021] In step (3), the flotation machine is a BF-8m. 3 .

[0022] In step (4), the grinding and classification system is the MQY5083 ball mill grinding and beneficiation system.

[0023] In step (4), the three-stage magnetic separation system consists of 6 XCTB-1230 magnetic separators, 4 CTB-1230 magnetic separators, and 4 DPC-1030 magnetic separators.

[0024] Example 1

[0025] The -250mm deep copper-iron ore, crushed by the underground gyratory crusher, the -250mm shallow copper-iron ore, and the open-pit copper-iron ore, as well as the -50mm open-pit copper-iron ore crushed by the revitalized two-stage closed-circuit crushing system, are mixed to form a mixed copper-iron ore with a copper grade of 0.270% and an iron grade of 21.50%. This mixed copper-iron ore enters the copper ore bin and is then ground in a Ф8.0×3.2m semi-autogenous mill. The ground product is screened using a 5×12mm GK screen. The material oversizes the +10mm screen and returns it to the Ф8.0×3.2m semi-autogenous mill, while the material undersizes the -10mm screen enters the copper No. 1 pump pool. 8g / t of butanol black powder is added to the copper No. 1 pump pool to pre-react with the slurry. The slurry from the copper No. 1 pump pool is then pumped to a Ф660×7 hydrocyclone assembly. The hydrocyclone underflow enters a Ф5.5×8.5m ball mill for regrinding. The regrinded slurry is then returned to the copper 1# pump tank. The hydrocyclone overflow, with a concentration of 40%-45% and a fineness of -200 mesh (73%-78%), enters the copper 1# mixing tank. In the copper 1# mixing tank, 45-50g / t butyl sodium xanthate and 20g / t frother pine oil are added to fully react with the slurry. The overflow from the copper 1# mixing tank enters the copper 2# mixing tank for thorough mixing. The overflow from the copper 2# mixing tank sequentially enters two KYF-200 flotation machines for roughing. The roughing concentrate enters the newly added vertical mill pump tank and is pumped to the Ф350×3 hydrocyclone group. The hydrocyclone underflow enters a 250KW vertical mill for regrinding. The regrinded slurry is then returned to the vertical mill pump tank. The hydrocyclone underflow, with a concentration of 20%-25% and a fineness of -200 mesh (73%-78%), enters the copper 1# mixing tank. The overflow from the hydrocyclone, with a purity of -325 mesh (above 80%), is sequentially fed into four BF-8 flotation machines for primary cleaning. The primary cleaning concentrate is then fed into two BF-8 flotation machines for secondary cleaning, and the secondary cleaning concentrate is fed into two BF-8 flotation machines for tertiary cleaning. The tailings from each cleaning process are returned to the previous operation. The tertiary cleaning concentrate is the final copper concentrate with a copper grade of 23.33%, a gold content of 4.44 g / t, and a silver content of 21.2 g / t. The roughing tailings are sequentially fed into two KYF-200 flotation machines for scavenging. In the first scavenging flotation machine, 5 g / t of butylammonium black powder, 35-40 g / t of butyl sodium xanthate, and 15 g / t of frother pine oil are added to the feed cell to fully react with the scavenging pulp. The scavenging concentrate is returned to the roughing process for further cleaning; the copper grade is 0.026%, and the iron grade is 21 g / t. 0.30% of the scavenging tailings enter the Melting No. 3 pump pool, where they are pumped to six XCTB-1230 weak magnetic separators for primary magnetic separation. The tailings from the primary magnetic separation are directly discarded, while the concentrate from the primary magnetic separation enters the Melting No. 4 pump pool. The slurry from the Melting No. 4 pump pool is pumped to the RD350×18 hydrocyclone group. The hydrocyclone underflow enters a Ф5.0×8.3m ball mill for regrinding, and the regrinded slurry returns to the Melting No. 4 pump pool. The hydrocyclone overflow, with a concentration of 20%-25% and a fineness of over 80% of -325 mesh, enters four CTB-1230 weak magnetic separators for secondary magnetic separation. The tailings from the secondary magnetic separation are directly discarded, while the concentrate from the secondary magnetic separation enters four DPC-1030 weak magnetic separators for tertiary magnetic separation. The tailings from the tertiary magnetic separation return to the Melting No. 4 pump pool. The tertiary magnetic separation concentrate is the final iron concentrate with an iron grade of 64.91%.

[0026] Compared with existing technologies ( Figure 1 This embodiment revitalizes and transforms an idle crushing system, employing a two-stage closed-circuit crushing system to process open-pit copper-bearing iron ore. The crushed open-pit copper-bearing iron ore then enters a copper series milling and beneficiation process, increasing the proportion of fine ore in the copper series raw ore and enhancing the processing capacity of the copper series semi-autogenous mill. A copper concentrate regrinding system is added to further improve the fineness of the copper concentrate, which is beneficial for gangue separation. Eight BF-8m³ flotation machines are used for fine selection to ensure sufficient concentrate enrichment time, which is beneficial for improving the grade of the copper concentrate. The dosage of butyl ammonium black reagent is appropriately increased to improve the gold and silver content in the copper concentrate. Given the variable properties of copper series raw ore, this invention uses a 1:1 combination of Xiangtian Zhuo butyl sodium xanthate and Hunan Mingzhu butyl sodium xanthate, i.e., a strong collector combined with a weak collector, working synergistically to compensate for each other's weaknesses, enhancing reagent adaptability, and stabilizing copper flotation indicators. The three-stage grinding and beneficiation system was changed from the MQY3264 ball mill grinding and beneficiation system to the MQY5083 ball mill grinding and beneficiation system, which improved the fineness of the three-stage grinding of copper series and the grade of iron concentrate after copper series enrichment.

[0027] The copper series saw an additional 38 t / h of raw ore processing capacity. Based on the 2021 operating rate of 96.75%, iron concentrate beneficiation ratio of 7.10, and copper concentrate beneficiation ratio of 79.41, the annual processing capacity of raw iron ore increased by 322,100 tons, iron concentrate production increased by 45,400 tons, and copper concentrate production increased by 4,056 tons. The sales grade of copper concentrate was 23.33%, an increase of 1.21 percentage points over the previous year; the gold content of copper concentrate was 4.44 g / t, an increase of 0.40 g / t over the previous year; the silver content of copper concentrate was 21.2 g / t, priced at 100%, an increase of 0.27 g / t over the previous year, and the silver pricing ratio increased by 40%; the sales grade of iron concentrate was 64.91%, an increase of 0.39 percentage points over the previous year.

Claims

1. A mineral processing method for steadily improving production indicators when multiple copper- and iron-bearing ores of different properties are simultaneously fed into the beneficiation process, characterized in that, Follow these steps to achieve the following: (1) The copper-iron ore from open-pit lava is poured into the ore bin and fed to the jaw crusher by a vibrating feeder for the first stage of crushing to a particle size of less than 100 mm. After crushing, the material is fed into a vibrating screen for screening. The material on the screen is returned to the cone crusher by a return belt conveyor for the second stage of closed-circuit crushing to a particle size of less than 50 mm. Then, it is mixed with the copper-iron ore that has been crushed by underground and surface gyratory crushers and fed into a semi-autogenous mill for grinding. The slurry under the screen is fed into the pump pool. (2) The reaction time between butylammonium black powder and slurry is relatively long. The dosing point of butylammonium black powder is moved to the pump pool before the hydrocyclone classification. 8 g / t of butylammonium black powder is added to the slurry in the pump pool to classify the slurry in the slurry pump pool. The resulting overflow from the classification enters the mixing tank for mixing and slurry preparation. 45-50 g / t of butyl sodium xanthate and 20 g / t of frother are added to the first mixing tank. The mixed slurry after slurry preparation is then subjected to the first copper roughing. (3) The roughing concentrate is fed into a copper roughing concentrate regrinding system consisting of a 250KW vertical mill and a Φ350×3 hydrocyclone group. The grinding fineness is increased from 60% of -325 mesh to over 80% of -325 mesh. The overflow from the hydrocyclone of the regrinding system enters the third copper cleaning process to obtain copper concentrate. The first cleaning process uses 4 8m 3 The second flotation stage uses two 8m flotation machines. 3 The third flotation stage uses two 8m flotation machines. 3 Flotation machine; (4) Copper roughing tailings enter the scavenging operation. Add 5g / t of butylammonium black powder, 35-40g / t of butyl sodium xanthate and 15g / t of frother to enter the scavenging operation. The scavenging concentrate is returned to the roughing operation. The scavenging tailings are subjected to three-stage grinding and classification and magnetic separation by the MQY5083 ball mill grinding system to obtain iron concentrate and final tailings. The MQY5083 ball mill in the grinding system is larger than the MQY3264 ball mill in the original process. In addition, there are two more weak magnetic separators in the first, second and third stages of the subsequent magnetic separation process than in the original process.

2. The mineral processing method according to claim 1, characterized in that, In step (2), butyl sodium xanthate is used in combination with butyl sodium xanthate with different collecting abilities.

3. The mineral processing method according to claim 2, characterized in that, The mass ratio of the more potent butyl sodium xanthate to the less potent butyl sodium xanthate is 1:

1.

4. The mineral processing method according to claim 1, characterized in that, Step (3) uses a copper rough concentrate regrinding system consisting of a 250KW vertical mill and a Φ350×3 hydrocyclone group.

5. The mineral processing method according to claim 1, characterized in that, In step (3), the flotation machine is a BF-8m. 3 .

6. The mineral processing method according to claim 1, characterized in that, In step (4), the grinding and classification system is the MQY5083 ball mill grinding and beneficiation system.

7. The mineral processing method according to claim 1, characterized in that, In step (4), the three-stage magnetic separation system consists of 6 XCTB-1230 magnetic separators, 4 CTB-1230 magnetic separators, and 4 DPC-1030 magnetic separators.

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