Improved flotation separation system for porphyry copper-molybdenum ores

Abstract

The utility model provides an improved porphyry copper molybdenum ore flotation separation system belongs to ore flotation technical field, include: the thickener that connects gradually, the agitator tank, the slurry tank, the roughing flotation machine, the roughing flotation machine is connected with first scavenging flotation machine, first concentration flotation machine respectively, first scavenging flotation machine is connected with second scavenging flotation machine, concentrate thickener, first diaphragm filter press, copper concentrate bunker gradually, first concentration flotation machine is connected with second concentration flotation machine, third concentration flotation machine, fourth concentration flotation machine, fifth concentration flotation machine, sixth concentration flotation machine, seventh concentration flotation machine, eighth concentration flotation machine gradually, and the foam tank export of eighth concentration flotation machine is connected with second diaphragm filter press, molybdenum concentrate bunker gradually, the system still includes the automatic control unit of roughing machine aeration and copper inhibitor automatic control unit. The system under the premise that the processing capacity increases, the concentration times are optimized, and the recovery rate and grade of copper concentrate and molybdenum concentrate are all improved.

Description

Technical Field

[0001] This utility model relates to the field of ore flotation technology, and in particular to an improved flotation separation system for porphyry copper-molybdenum ore. Background Technology

[0002] The original porphyry copper-molybdenum ore beneficiation process adopted a process of one roughing, two scavenging, and nine cleaning stages, with a processing capacity of 25m³. 3 / h. However, compared to previous copper-molybdenum ores, the Wushan copper-molybdenum ore currently being mined has a higher primary copper content and a continuously increasing molybdenum grade, leading to greater separation difficulty, higher reagent consumption, and a smaller processing capacity due to the smaller volume of the flotation machine in the refining section. As the molybdenum grade of the raw ore increases, the mixed flotation yield increases, resulting in a higher concentration of molybdenum concentrate in the process. The sequential return from each refining zone leads to a higher concentration in the refining area, resulting in poor separation efficiency. Excessive co-occurrence of copper and molybdenum concentrates causes fluctuations and unsatisfactory recovery rates and concentrate grades, significant metal recycling losses, and high tailings grades, all of which restrict recovery rates and concentrate quality. Specifically, when the feed concentration is 40% and the flow rate is 25 m³ / h, the separation process indicators are relatively stable, enabling stable production of copper-molybdenum concentrates with a molybdenum content below 0.3%, a molybdenum grade above 45%, and a copper content below 0.7%. When the feed concentration remained constant at 40%, and the flow rate was increased to 30 m³ / h and 35 m³ / h, the process in the field showed that the foam in each selection zone was sticky and the foam flow rate was slow. Appropriately increasing the foam flushing water increased the foam flow rate, but the volume of the flotation machine in the separation and beneficiation zone was relatively small. After increasing the flushing water, the flotation concentration was too low. After increasing the flow rate, the flotation cell overflowed severely, which led to fluctuations in the separation system indicators. The copper concentrate contained more than 0.4% molybdenum, the molybdenum concentrate had a molybdenum grade of about 43%, and the molybdenum concentrate contained more than 1% copper. The co-containment of copper and molybdenum in the concentrate increased significantly.

[0003] It is evident that even operating at full capacity, the existing flotation separation system still cannot meet the on-site production needs when the grade of molybdenum in the raw ore increases and the yield of mixed flotation increases. Therefore, in order to adapt to changes in production conditions and solve the existing problems in the separation process of porphyry copper-molybdenum ore, it is necessary to improve the beneficiation process and equipment control based on the existing equipment, so as to improve the recovery rate and grade of molybdenum concentrate and copper concentrate, thereby enhancing the company's production efficiency and product quality. Utility Model Content

[0004] This invention provides an improved flotation separation system for porphyry copper-molybdenum ore, which solves the problems of poor separation effect, excessive intermingling of copper and molybdenum concentrates, serious metal recycling loss, unsatisfactory recovery rate and concentrate grade, and high tailings grade in existing flotation separation systems when the raw ore molybdenum grade increases and the mixed flotation yield increases.

[0005] This utility model provides an improved flotation separation system for porphyry copper-molybdenum ore, comprising: a thickener, a stirring tank, a slurry storage tank, and a rougher flotation machine connected in sequence; the underflow outlet of the rougher flotation machine is connected to a first scavenger flotation machine, the froth tank outlet of the rougher flotation machine is connected to a first cleaner flotation machine, and the underflow outlets of both the first scavenger flotation machine and the first cleaner flotation machine are connected to the reflux inlet of the rougher flotation machine; the froth tank outlet of the first scavenger flotation machine is connected to a second scavenger flotation machine, the froth tank outlet of the second scavenger flotation machine is connected to the reflux inlet of the first scavenger flotation machine, the underflow outlet of the second scavenger flotation machine is connected to a concentrate thickener, the concentrate thickener is connected to a first diaphragm filter press, the solid outlet of the first diaphragm filter press is connected to a copper concentrate storage tank, and the liquid outlet of the first diaphragm filter press is connected to a filtrate tank.

[0006] Furthermore, along the flow direction of the concentrate discharged from the froth tank outlet of the first refining flotation machine, a second, third, fourth, fifth, sixth, seventh, and eighth refining flotation machine are sequentially connected. The froth tank outlet of the eighth refining flotation machine is connected to a second diaphragm filter press. The solid outlet of the second diaphragm filter press is connected to a molybdenum concentrate storage tank, and the liquid outlet of the second diaphragm filter press is connected to a filtrate tank. The underflow outlets of the second, third, fourth, fifth, sixth, seventh, and eighth refining flotation machines are respectively connected to the reflux inlet of the previous refining flotation machine.

[0007] Furthermore, the system also includes an automatic control unit for the aeration volume of the flotation machines and an automatic control unit for the copper inhibitor; the automatic control unit for the aeration volume of the flotation machines is used to automatically control and adjust the aeration volume of each flotation machine; the automatic control unit for the copper inhibitor is used to control the automatic quantitative addition of sodium hydrosulfide reagent.

[0008] Furthermore, the automatic control unit for the aeration volume of the flotation machine includes a main aeration pipe and a first control device. The main aeration pipe is connected to the aeration inlet of each flotation machine through multiple aeration branch pipes. Each aeration branch pipe is connected to each flotation machine in a corresponding manner. Each aeration branch pipe is equipped with an aeration control valve and an air inlet flow meter. Each aeration control valve and each air inlet flow meter are electrically connected to the first control device.

[0009] Furthermore, the automatic control unit for the aeration volume of the flotation machine also includes a foam detection sensor. Each flotation machine is equipped with a foam detection sensor, and each foam detection sensor is electrically connected to the first control device.

[0010] Furthermore, each foam detection sensor, each inflation control valve, and each air intake flow meter are electrically connected to the first control device in parallel.

[0011] Furthermore, the automatic control unit for copper inhibitors includes a reagent tank and a second control device. The bottom outlet of the reagent tank is connected to a main inlet pipe, and a flow meter is installed at the inlet of the main inlet pipe. Multiple branch inlet pipes are installed on the main inlet pipe, and each branch inlet pipe is connected to the second scavenging flotation machine and each of the cleaning flotation machines in a corresponding manner. Each branch inlet pipe is equipped with a peristaltic pump and a feed control valve. Each feed control valve is electrically connected to the second control device.

[0012] Furthermore, each feed branch pipe is equipped with a feed branch pipe flow meter, and each feed branch pipe flow meter is electrically connected to the second control device. The second control device controls the flow rate of sodium hydrosulfide reagent entering each fine flotation machine through the feed control valve. The feed flow rates of the second scavenging flotation machine and the first, third, fifth, and seventh fine flotation machines are equal. The feed flow rates of the second, fourth, sixth, and eighth fine flotation machines are equal. The feed flow rate of the first fine flotation machine is greater than that of the second fine flotation machine.

[0013] Furthermore, a liquid level detector is installed in the medicine tank, which is electrically connected to the second control device, and the second control device is connected to a low liquid level alarm.

[0014] This invention provides an improved flotation and separation system for porphyry copper-molybdenum ore. By utilizing existing equipment and systems, it reduces the number of cleaning stages, produces molybdenum concentrate earlier, and reduces the circulation volume in the copper-molybdenum separation process, achieving rapid flotation and ore discharge. This increases the system's processing capacity and molybdenum product output. The feed flow rate is increased from 25 m³ / h. 3 / h increased to 30-35m 3 The molybdenum recovery rate has increased to over 90% per hour, an improvement of 1-2%. The molybdenum grade of the copper concentrate produced is below 0.35%, and the molybdenum grade of the molybdenum concentrate reaches 48%. The copper content in the molybdenum concentrate has decreased to below 0.6%. The output of molybdenum concentrate has now increased to 3243.56 tons per year, which can produce more than 300 tons of molybdenum concentrate for the company each year, resulting in significant economic benefits.

[0015] The improved system optimizes the aeration volume of each flotation machine in the copper-molybdenum separation process through the automatic control unit for flotation machine aeration volume, adjusting the thickness, quality, and scraping volume of the froth layer, making the flotation operation control more scientific and accurate. Furthermore, the automatic control unit for copper inhibitors optimizes the addition method of sodium hydrosulfide reagent, proposing a separation zone inhibition principle to achieve automated point-by-point and quantitative addition of sodium hydrosulfide reagent. This improves the problems of poor froth flowability and high froth viscosity in the copper-molybdenum separation process. The automatic control also saves labor, reduces the difficulty of operation, enhances production stability, better adapts to changes in the properties of the feed ore, and ensures the sustainable development of the enterprise. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an improved porphyry copper-molybdenum ore flotation separation system provided in one embodiment of the present invention; Figure 2 A schematic diagram of the structure of the automatic control unit for the aeration volume of a flotation machine provided in one embodiment of this utility model; Figure 3 A schematic diagram of the structure of the automatic control unit for copper inhibitors provided in one embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1-Thickening machine, 2-Agitator, 3-Slurry storage tank, 4-Roughening flotation machine, 5-Copper concentrate storage bin, 6-Molybdenum concentrate storage bin, 7-Filtration tank, 81-First scavenging flotation machine, 82-Second scavenging flotation machine, 83-Concentrate thickening machine, 84-First diaphragm filter press, 91-First cleaning flotation machine, 92-Second cleaning flotation machine, 93-Third cleaning flotation machine, 94-Fourth cleaning flotation machine, 95-Fifth cleaning flotation machine, 96-Sixth cleaning flotation machine, 97-Seventh cleaning flotation machine, 98-Eighth cleaning flotation machine Flotation machine, 99-Second diaphragm filter press, 101-Main aeration pipe, 102-First control device, 103-Aeration branch pipe, 104-Aeration control valve, 105-Inlet flow meter, 106-Foam detection sensor, 111-Reagent tank, 112-Second control device, 113-Main inlet pipe, 114-Inlet flow meter, 115-Inlet branch pipe, 116-Peristaltic pump, 117-Inlet control valve, 118-Inlet branch pipe flow meter, 121-Level detector, 122-Low level alarm. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0020] like Figure 1This utility model discloses an improved flotation separation system for porphyry copper-molybdenum ore, comprising: a thickener 1, a stirring tank 2, a slurry storage tank 3, and a rougher flotation machine 4 connected in sequence; the underflow outlet of the rougher flotation machine 4 is connected to a first scavenger flotation machine 81, the froth tank outlet of the rougher flotation machine 4 is connected to a first cleaner flotation machine 91, and the underflow outlets of both the first scavenger flotation machine 81 and the first cleaner flotation machine 91 are connected to the reflux inlet of the rougher flotation machine 4; the first scavenger flotation machine 81... The froth tank outlet of flotation machine 81 is connected to the second scavenging flotation machine 82. The froth tank outlet of the second scavenging flotation machine 82 is connected to the reflux inlet of the first scavenging flotation machine 81. The underflow outlet of the second scavenging flotation machine 82 is connected to the concentrate thickener 83. The concentrate thickener 83 is connected to the first diaphragm filter press 84. The solid outlet of the first diaphragm filter press 84 is connected to the copper concentrate storage tank 5. The liquid outlet of the first diaphragm filter press 84 is connected to the filtrate tank 7.

[0021] Preferably, a second, third, fourth, fifth, sixth, seventh, and eighth finer flotation machines 92, 93, 94, 95, 96, 97, and 98 are sequentially connected along the flow direction of the concentrate discharged from the froth tank outlet of the first finer flotation machine 91. The froth tank outlet of the eighth finer flotation machine 98 is connected to a second diaphragm filter press 99. The solid outlet of the second diaphragm filter press 99 is connected to a molybdenum concentrate storage tank 6, and the liquid outlet of the second diaphragm filter press 99 is connected to a filtrate tank 7. The underflow outlets of the second, third, fourth, fifth, sixth, seventh, and eighth finer flotation machines 92, 93, 94, 95, 96, 97, and 98 are respectively connected to the reflux inlet of the previous finer flotation machine.

[0022] Preferably, the system further includes an automatic control unit for the aeration volume of the flotation machine and an automatic control unit for the copper inhibitor; the automatic control unit for the aeration volume of the flotation machine is used to automatically control and adjust the aeration volume of each flotation machine; the automatic control unit for the copper inhibitor is used to control the automatic quantitative addition of sodium hydrosulfide reagent.

[0023] The improved copper-molybdenum ore flotation separation system uses a mixed copper-molybdenum concentrate from the upstream mixed flotation process. The concentrate is first fed into thickener 1 for thickening and reagent removal, then conditioned in stirring tank 2, temporarily stored in storage tank 3, and then enters rougher flotation machine 4 for copper-molybdenum separation. The improved copper-molybdenum separation flotation process consists of one roughing, two scavenging, and eight cleaning stages. The underflow from the cleaning flotation machine and the first scavenging flotation machine 81 is sequentially returned to the previous stage flotation machine. The underflow from the second scavenging flotation machine 82 is concentrated in concentrate thickener 83, then fed into the first diaphragm filter press 84 for dewatering, producing copper concentrate which is stored in copper concentrate storage silo 5. The froth produced by the eighth cleaning flotation machine 98 is filtered by the second diaphragm filter press 99 to produce molybdenum concentrate, which is stored in molybdenum concentrate storage silo 6 for easy bagging and sale. This improved copper-molybdenum ore flotation separation system, without affecting production indicators, utilizes existing equipment and systems, reduces the number of cleaning stages, produces molybdenum concentrate earlier, and reduces the circulation volume in the copper-molybdenum separation process, achieving rapid flotation and ore discharge. This increases the system's processing capacity. Simultaneously, the automatic control unit for aeration volume optimizes the aeration volume of each flotation machine in the copper-molybdenum separation process, and the automatic control unit for copper inhibitors optimizes the addition method of sodium hydrosulfide, improving the problems of poor foam flowability and high foam viscosity in the copper-molybdenum separation process. This reduces the difficulty of operation for personnel, increasing the molybdenum recovery rate by 1-2%, reaching a higher level (over 90%), increasing molybdenum product output. Furthermore, this improved system enhances production stability, better adapts to changes in the properties of the feed ore, and ensures the sustainable development of the enterprise.

[0024] It should be noted that the setup, connection, and use of other equipment in this flotation separation system, such as power equipment, stirring equipment, and reagent addition equipment, are the same as in the original system and existing technology, and will not be repeated here. The purpose of this utility model is to show the differences from the original system. Multiple roughing flotation machines, scavenging flotation machines, and cleaning flotation machines in each stage can be set up in parallel depending on the processing capacity. For example, roughing and scavenging are both composed of XCFII-24 and KYFII-24 flotation units, with a 3-2-2 configuration for separating roughing and scavenging. The first cleaning flotation machine 91 consists of one XCFII-24 and two KYFII-24 flotation units; the second cleaning flotation machine 92 consists of one XCFII-16 and two KYFII-16 units; and the third cleaning flotation machine 93 consists of one XCFII-8 and... The fourth fine flotation machine 94 consists of one XCFII-8 and one KYFII-8; the fifth fine flotation machine 95 consists of one XCFII-6 and one KYFII-6; the sixth fine flotation machine 96 consists of one XCFII-4 and one KYFII-4; the seventh fine flotation machine 97 consists of one XCFII-3 and one KYFII-3; and the eighth fine flotation machine 98 consists of one XCFII-3 and one KYFII-3.

[0025] In the original system, the aeration of the flotation machine relied primarily on manual adjustment. When the grade and properties of the raw ore fluctuated significantly during production, manual adjustments were often delayed, severely impacting the thickness of the froth layer and the overall beneficiation effect. Therefore, if... Figure 2 The automatic control unit for the aeration volume of the flotation machine in this improved system includes an aeration main pipe 101 and a first control device 102. The aeration main pipe 101 is connected to the aeration inlet of each flotation machine through multiple aeration branch pipes 103. Each aeration branch pipe 103 is connected to each flotation machine in a corresponding manner. Each aeration branch pipe 103 is equipped with an aeration control valve 104 and an air inlet flow meter 105. Each aeration control valve 104 and each air inlet flow meter 105 are electrically connected to the first control device 102.

[0026] The main aeration pipe 101 is connected to a gas generating device, such as a blower or compressor; no special restrictions are imposed here. The electrical signal from the air inlet flow meter 105 on each aeration branch pipe 103 is input to the first control device 102. The first control device 102 compares the received signal with the set value and, based on the status of each air inlet flow meter 105, adjusts the opening and closing degree of the aeration control valve 104 accordingly. This achieves the purpose of controlling the aeration volume and providing quantitative automatic aeration, facilitating automated control and adjustment of the aeration volume of each flotation machine, and making the aeration volume adjustment of the entire flotation system quick and precise. Especially when the grade and properties of the raw ore fluctuate significantly during production, the aeration volume can be quickly adjusted through the first control device 102 to regulate the thickness, quality, and scraping amount of the froth layer, making the flotation operation control more scientific and accurate, and contributing to improving and stabilizing the quality of flotation production.

[0027] Preferably, the automatic control unit for aeration volume of the flotation machine further includes a foam detection sensor 106. Each flotation machine is equipped with a foam detection sensor 106, and each foam detection sensor 106 is electrically connected to the first control device 102. The aforementioned foam detection sensor 106 can be a foam level sensor, an ultrasonic rangefinder, a laser rangefinder, etc. By measuring the foam layer in the flotation machine in real time, the thickness of the foam layer can be known more accurately and intuitively, and the aeration volume of each flotation zone can be adjusted accordingly to avoid foam stickiness and poor flowability caused by insufficient aeration. Taking a processing feed flow rate of 30 m³ / h as an example, the aeration volume needs to be from 0.4-0.5 m³ / h. 3 / m 2 ·min (original processing capacity 25m) 3 / h) increased to 0.7-0.8m 3 / m 2 Only when the aeration rate reaches ·min can the required aeration rate for flotation beneficiation be achieved.

[0028] Preferably, each foam detection sensor 106, each aeration control valve 104, and each air inlet flow meter 105 are electrically connected to the first control device 102 in parallel. The foam detection sensor 106 detects the foam condition during flotation machine operation and feeds the results back to the first control device 102. The first control device 102 performs calculations according to a pre-designed control program and controls the aeration control valve 104 to adjust its opening state according to the overall foam layer condition, thereby achieving automatic control of the aeration volume. The parallel connection of these components to the first control device 102 allows for precise individual control and adjustment of the foam layer condition within each flotation machine, improving the flotation machine's efficiency and saving labor costs.

[0029] In the original system, sodium hydrosulfide reagent was added manually. However, this reagent is corrosive and poses a high risk. Furthermore, manual addition leads to unstable flow rates and large dosage errors. The effects of flotation reagents are time-limited, and the addition technique cannot be precisely controlled, often resulting in large fluctuations in operating conditions and unsatisfactory concentrate grades. Therefore, if... Figure 3 The copper inhibitor automatic control unit of the improved system includes a reagent tank 111 and a second control device 112. The bottom outlet of the reagent tank 111 is connected to a main inlet pipe 113, and a flow meter 114 is installed at the inlet of the main inlet pipe 113. Multiple inlet branch pipes 115 are installed on the main inlet pipe 113, and the multiple inlet branch pipes 115 are connected one-to-one with the second scavenging flotation machine 82 and each of the cleaning flotation machines. Each inlet branch pipe 115 is equipped with a peristaltic pump 116 and an inlet control valve 117. Each inlet control valve 117 is electrically connected to the second control device 112.

[0030] The reagent in the reagent tank 111 is distributed to each reagent branch pipe 115 through the main reagent inlet pipe 113, and then sent into the flotation machine through the peristaltic pump 116. The peristaltic pump 116 can control the reagent flow rate with high precision. The second control device 112 can realize the automated point distribution and quantitative addition of sodium hydrosulfide reagent. The automatic control saves manpower and makes the reagent use effect optimal.

[0031] Preferably, each feed branch pipe 115 is equipped with a feed branch pipe flow meter 118, and each feed branch pipe flow meter 118 is electrically connected to the second control device 112. The second control device 112 controls the flow rate of sodium hydrosulfide reagent entering each fine flotation machine through the feed control valve 117. The feed flow rates of the second scavenging flotation machine 82 and the first fine flotation machine 91, the third fine flotation machine 93, the fifth fine flotation machine 95, and the seventh fine flotation machine 97 are equal. The feed flow rates of the second fine flotation machine 92, the fourth fine flotation machine 94, the sixth fine flotation machine 96, and the eighth fine flotation machine 98 are equal. The feed flow rate of the first fine flotation machine 91 is greater than the feed flow rate of the second fine flotation machine 92.

[0032] The inlet branch flow meter 118 can detect the dosage of the reagent in the inlet branch 115 in real time. The original process was to add sodium hydrosulfide to all selection zones from Sweep 2 to Refinement 9, and the dosage of the reagent was within the same range (such as around 5000 mL / min). After the improvement, the system proposed the principle of separation zone inhibition. After optimization, the dosage of sodium hydrosulfide in the previous selection zone remained unchanged, while the dosage of sodium hydrosulfide in the subsequent selection zone was greatly reduced (such as reduced to around 3000 mL / min). This caused a change in the viscosity of the slurry, ensuring the smooth flow of the copper-molybdenum separation process. Under the premise of optimizing the indicators, the dosage of sodium hydrosulfide reagent was reduced, saving production costs.

[0033] Preferably, a level detector 121 is installed in the reagent tank 111. The level detector 121 is electrically connected to the second control device 112, and the second control device 112 is connected to a low-level alarm 122. During the flotation process, a large amount of reagent is used. The second control device 112 and its connected level detector 121 monitor the reagent dosage in the reagent tank 111, and the low-level alarm 122 promptly alerts the operator to replenish the reagent.

[0034] It should be noted that, Figure 2 and Figure 3 The number of flotation machines in the diagram does not correspond one-to-one with production conditions and is used for illustration only. The connection methods of the air inlet branch pipe, chemical inlet branch pipe, and their control valves and flow meters are the same for each flotation machine, and therefore are not described in detail in the diagram. Those skilled in the art can use the diagram to connect and arrange multiple pipes and equipment. In addition, the first control device 102 and the second control device 112 in this system can be computers with control software systems installed in them. These are existing technologies and will not be described in detail here. The first control device 102 and the second control device 112 can analyze and process the received electrical signals, compare them with the pre-set control threshold values ​​and adjustment threshold ranges, judge and generate control commands, and then send signals to each control valve through wires to adjust their opening degree, etc., to achieve the purpose of quantitative air and chemical supply.

[0035] The improved porphyry copper-molybdenum ore flotation separation system described above operates as follows: A copper-molybdenum mixed concentrate from the upstream mixed flotation process is fed at a rate of 720 t / d and 30 m³ / h. The mixed concentrate contains 21.25% copper and 2.3% molybdenum. The concentrate is first thickened and de-reagented in a Φ30m thickener 1, then sized in a Φ3.0×3.0m mixing tank 2, and temporarily stored in a Φ9.0×9.5m storage tank 3 before entering the roughing flotation machine 4 to begin the copper-molybdenum separation roughing operation. The improved copper-molybdenum separation flotation process consists of one roughing, two scavenging, and eight cleaning stages. The froth from the roughing flotation machine 4 enters the first cleaning flotation machine 91, and the underflow enters the first scavenging flotation machine 81. The froth from the first scavenging flotation machine 81 enters the second scavenging flotation machine 82. The underflow from both the first scavenging flotation machine 81 and the first cleaning flotation machine 91 enters the roughing flotation machine 4. The froth from the second scavenging flotation machine 82 returns to the first scavenging flotation machine 81. The underflow from the second scavenging flotation machine 82 is concentrated by the concentrate thickener 83 and then fed into the first diaphragm filter press 84 for dewatering. The resulting copper concentrate is stored in the copper concentrate storage silo 5.

[0036] In the refining section, the flow direction of the concentrate discharged from the froth tank outlet of the first refining flotation machine 91 is as follows: second refining flotation machine 92, third refining flotation machine 93, fourth refining flotation machine 94, fifth refining flotation machine 95, sixth refining flotation machine 96, seventh refining flotation machine 97, and eighth refining flotation machine 98. The underflow of each refining flotation machine is returned to the previous refining flotation machine in sequence. The froth produced at the froth tank outlet of the eighth refining flotation machine 98 is filtered by the second diaphragm filter press 99 to produce molybdenum concentrate, which is stored in the molybdenum concentrate storage silo 6 for easy bagging and sale.

[0037] The production indicators of the original system and the improved system under the same processing capacity (207,900 t / year) and the same feed rate (30 m³ / h) are as follows: 1) The molybdenum concentrate obtained from the original system has a molybdenum grade of 43.13%, a copper content of 1.92%, a molybdenum concentrate yield of 2.43%, and a molybdenum recovery rate of 83.01%; the copper concentrate has a molybdenum content of 0.42%, a copper grade of 20.40%, a copper concentrate yield of 99.57%, and a copper recovery rate of 99.59%.

[0038] 2) The improved system yielded a molybdenum concentrate with a molybdenum grade of 48.78%, a copper content of 0.33%, a molybdenum concentrate yield of 2.39%, and a molybdenum recovery rate of 91.84%; and a copper concentrate with a molybdenum content of 0.32%, a copper grade of 21.56%, a copper concentrate yield of 99.61%, and a copper recovery rate of 99.93%.

[0039] It should be noted that the detailed structure of some devices in this utility model is not described in detail, but belongs to the prior art known to those skilled in the art, and therefore will not be described again here. In addition, the parts of this device not described are the same as or can be implemented using existing technology.

[0040] It should be noted that those skilled in the art, under the guidance of this utility model, can also make some modifications to the design of the above system. For example, the equipment in the system is also equipped with level gauges, overflow / nitrogen pipelines, etc.; pumps, pressure sensors, flow meters or temperature sensors are installed on the conveying pipelines inside the system in different units or devices, and different valves, such as pressure relief valves, pressure regulating valves, safety valves, pneumatic valves, etc., are also installed to regulate and stabilize the pressure of the entire system, and the opening degree of the valves can also be adjusted to regulate the flow rate of materials in the pipeline, etc.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An improved flotation separation system for porphyry copper-molybdenum ore, characterized in that, include: A thickener, a mixing tank, a slurry storage tank, and a roughing flotation machine are connected in sequence; the underflow outlet of the roughing flotation machine is connected to a first scavenging flotation machine, the froth tank outlet of the roughing flotation machine is connected to a first cleaning flotation machine, and the underflow outlets of the first scavenging flotation machine and the first cleaning flotation machine are both connected to the reflux inlet of the roughing flotation machine. The froth tank outlet of the first scavenging flotation machine is connected to the second scavenging flotation machine, the froth tank outlet of the second scavenging flotation machine is connected to the reflux inlet of the first scavenging flotation machine, the underflow outlet of the second scavenging flotation machine is connected to the concentrate thickener, the concentrate thickener is connected to the first diaphragm filter press, the solid outlet of the first diaphragm filter press is connected to the copper concentrate storage tank, and the liquid outlet of the first diaphragm filter press is connected to the filtrate tank. A second, third, fourth, fifth, sixth, seventh, and eighth finer flotation machines are sequentially connected along the flow direction of the concentrate discharged from the froth tank outlet of the first finer flotation machine. The froth tank outlet of the eighth finer flotation machine is connected to a second diaphragm filter press. The solid outlet of the second diaphragm filter press is connected to a molybdenum concentrate storage tank, and the liquid outlet of the second diaphragm filter press is connected to a filtrate tank. The underflow outlets of the second, third, fourth, fifth, sixth, seventh, and eighth finer flotation machines are respectively connected to the reflux inlet of the previous finer flotation machine. The system also includes an automatic control unit for the aeration volume of the flotation machine and an automatic control unit for the copper inhibitor; the automatic control unit for the aeration volume of the flotation machine is used to automatically control and adjust the aeration volume of each flotation machine; the automatic control unit for the copper inhibitor is used to control the automatic quantitative addition of sodium hydrosulfide reagent.

2. The improved flotation separation system for porphyry copper-molybdenum ore according to claim 1, characterized in that, The automatic control unit for the aeration volume of the flotation machine includes a main aeration pipe and a first control device. The main aeration pipe is connected to the aeration inlet of each flotation machine through multiple aeration branch pipes. Each aeration branch pipe is connected to each flotation machine in a one-to-one correspondence. Each aeration branch pipe is equipped with an aeration control valve and an air inlet flow meter. Each aeration control valve and each air inlet flow meter are electrically connected to the first control device.

3. The improved flotation separation system for porphyry copper-molybdenum ore according to claim 2, characterized in that, The automatic control unit for the aeration volume of the flotation machine also includes a foam detection sensor. Each flotation machine is equipped with the foam detection sensor, and each foam detection sensor is electrically connected to the first control device.

4. The improved flotation separation system for porphyry copper-molybdenum ore according to claim 3, characterized in that, Each of the foam detection sensors, each of the inflation control valves, and each of the air intake flow meters are electrically connected to the first control device in parallel.

5. The improved flotation separation system for porphyry copper-molybdenum ore according to any one of claims 1-4, characterized in that, The copper inhibitor automatic control unit includes a reagent tank and a second control device. The bottom outlet of the reagent tank is connected to a main inlet pipe, and a flow meter is installed at the inlet of the main inlet pipe. The main inlet pipe is provided with multiple branch inlet pipes, which are connected one-to-one with the second scavenging flotation machine and each of the cleaning flotation machines. Each branch inlet pipe is provided with a peristaltic pump and a feed control valve. Each feed control valve is electrically connected to the second control device.

6. The improved flotation separation system for porphyry copper-molybdenum ore according to claim 5, characterized in that, Each of the aforementioned feed pipes is equipped with a feed pipe flow meter, and each feed pipe flow meter is electrically connected to the second control device. The second control device controls the flow rate of sodium hydrosulfide reagent entering each fine flotation machine through the feed control valve. The feed flow rates of the second scavenging flotation machine and the first, third, fifth, and seventh fine flotation machines are equal. The feed flow rates of the second, fourth, sixth, and eighth fine flotation machines are equal. The feed flow rate of the first fine flotation machine is greater than that of the second fine flotation machine.

7. The improved flotation separation system for porphyry copper-molybdenum ore according to claim 5, characterized in that, The medicine tank is equipped with a liquid level detector, which is electrically connected to the second control device, and the second control device is connected to a low liquid level alarm.

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