Malachite type refractory copper oxide ore suspension sulfidation roasting treatment system

Abstract

The application discloses a malachite type refractory copper oxide ore suspension sulfidation roasting treatment system and belongs to the technical field of mineral processing. The system comprises a first stock bin, a first screw feeder, a cyclone preheater, a first cyclone separator, a suspension heating furnace, a second stock bin, a second screw feeder, a suspension sulfidation roasting furnace, a second cyclone separator, a cooler, a third cyclone separator, a first water-cooling heat exchanger, a stirring mill, a flotation machine, a combustion machine, a flow seal valve, a dust hopper, a bag-type dust collector, a desulfurization tower, a second water-cooling heat exchanger, an electric dust collector, a fan and a chimney. The system is characterized in that the product quality is effectively controlled through multi-stage suspension roasting, the phase accurate conversion of malachite minerals in the decomposition and sulfidation processes is realized, the copper oxide ore is converted into sulfidized copper ore with uniform product properties, the sulfidation roasting efficiency of the system is high, the sulfidation agent used is low in price and small in quantity, the sulfidized mineral produced is stable in properties, and the conventional flotation separation is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and specifically relates to a suspension sulfidation roasting system for malachite-type refractory copper oxide ore. Background Technology

[0002] Copper exists primarily in the form of compounds in nature. Based on the state of copper occurrence in ores, copper resources can be divided into two main categories: copper sulfide ores and copper oxide ores. Copper sulfide ores, due to their relatively good beneficiation properties, are the primary raw material for copper extraction. However, with the continuous depletion of high-quality mineral resources, easily beneficiated copper sulfide ores are becoming increasingly scarce. To compensate for this resource shortage, the development and utilization of copper oxide ores has attracted considerable attention. However, copper oxide ores are characterized by complex mineral composition, the coexistence of multiple copper oxide minerals, fine-grained distribution, and a tendency to become muddy, making their beneficiation extremely difficult. They are typical complex and difficult-to-beneficial mineral resources, and large-scale development and utilization have not yet been achieved.

[0003] Currently, the main methods for separating refractory copper oxide ores are chemical methods and flotation. Chemical separation methods such as acid leaching, ammonia leaching, and bioleaching are effective technologies for processing refractory copper oxide ores, but they suffer from numerous problems including long production cycles, high costs, large reagent consumption, equipment corrosion, and environmental pollution. Flotation separation methods offer advantages such as simple operation, mature equipment, and low cost. In recent years, extensive research has been conducted on the flotation of refractory copper oxide ores, gradually recognizing that the strong surface polarity of copper oxide minerals is the primary reason for their difficulty in separation. A consensus has been reached on thoroughly altering the surface properties of copper oxide minerals through sulfidation reconstruction to improve their floatability and achieve efficient flotation separation. Patent CN201310142406.9 relates to a method for enhancing the sulfidation process of cuprite in mixed copper ore flotation. It involves adding ferric sulfate, hydrogen peroxide, and ammonium persulfate to a cuprite-containing slurry, followed by prolonged stirring to pre-oxidize the cuprite surface. Then, ammonium sulfide, sodium sulfide, and other sulfiding agents are added to sulfide the cuprite, and finally, xanthate collectors are used for flotation to recover the sulfided cuprite. This patent sulfidates cuprite, converting it into copper sulfide minerals and improving the recovery rate of oxidized copper ore. However, the high dosage of sulfiding agents leads to easy sulfide detachment and low sulfidation efficiency. Patent CN202011112697.3 relates to a copper-ammonium combined sulfidation activator and a sulfidation flotation method for oxidized copper ore. It proposes using an activator composed of copper salt solution and ammonium solution to activate oxidized copper ore. Ammonium ions can undergo a dehydration reaction with copper hydroxyl groups on the ore surface, reducing the hydrophilicity of the mineral surface. Simultaneously, copper ions can be rapidly adsorbed on the mineral surface, increasing the number of active sites. Adding a sulfiding agent to the activated slurry to sulfidize the mineral surface before flotation significantly improves sulfidation efficiency and copper concentrate recovery. However, this process suffers from problems such as complex reagent formulations, high activator dosage, long process flow, and high beneficiation costs. Therefore, efficient sulfidation of oxidized copper ore has become a major challenge restricting its beneficiation and utilization. Given the current limitations of efficient and environmentally friendly methods for the comprehensive utilization of oxidized copper ore, developing technologies and equipment that are low-cost, high-capacity, environmentally friendly, highly efficient in sulfidation, and easily industrialized is of great significance. Summary of the Invention

[0004] This invention addresses the problems of low sulfidation efficiency, easy detachment of sulfides, and strict dosage requirements of sulfiding agents in existing surface sulfidation technologies for copper oxide ores. It proposes a suspension sulfidation roasting treatment system for refractory copper oxide ores, which can effectively and selectively convert malachite-type refractory copper oxide ores into highly floatable copper sulfide ores, thereby enabling recovery using conventional flotation processes.

[0005] The malachite-type refractory copper oxide ore suspension sulfidation roasting system of the present invention includes a first silo, a first screw feeder, a cyclone preheater, a first cyclone separator, a suspension heating furnace, a second silo, a second screw feeder, a suspension sulfidation roasting furnace, a second cyclone separator, a cooler, a third cyclone separator, a first water-cooled heat exchanger, a stirred mill, a flotation machine, a burner, a flow sealing valve, an ash hopper, a bag filter, a desulfurization tower, a second water-cooled heat exchanger, an electrostatic precipitator, a fan, and a chimney; the discharge port of the first silo is connected to the inlet of the first screw feeder, the discharge port of the first screw feeder is connected to the inlet of the cyclone preheater through a pipe, and the discharge port of the cyclone preheater is connected to the inlet of the flow sealing valve. The discharge port of the flow sealing valve is connected to the feed port of the suspension heating furnace; the bottom of the suspension heating furnace is equipped with an air inlet, which is connected to the burner; the top discharge port of the suspension heating furnace is connected to the feed port of the first cyclone separator through a pipe; the discharge ports of the first cyclone separator and the second screw feeder are connected to the feed port of the suspension sulfurization roasting furnace through pipes; the discharge port of the suspension sulfurization roasting furnace is connected to the feed port of the second cyclone separator; the discharge port of the second cyclone separator is connected to the feed port of the cooler; the discharge port of the cooler is connected to the feed port of the third cyclone separator; the discharge port of the third cyclone separator is connected to the feed port of the stirred mill through a pipe; and the discharge port of the stirred mill is connected to the flotation machine.

[0006] In the above system, the pipeline between the third cyclone separator and the stirred mill is equipped with a first water-cooled heat exchanger.

[0007] In the above system, the outlet of the first cyclone separator is connected to the inlet of the cyclone preheater via a pipeline.

[0008] In the above system, the feed inlet of the second screw feeder is connected to the discharge outlet of the second hopper.

[0009] In the above system, the outlet of the second cyclone separator is connected to the bottom inlet of the suspension heating furnace.

[0010] In the above system, the outlets of the cyclone preheater and the third cyclone separator are connected to the inlet of the bag filter through pipes. The outlet of the bag filter is connected to the inlet of the desulfurization tower through pipes. The outlet of the desulfurization tower is connected to the inlet of the electrostatic precipitator through pipes. The outlet of the electrostatic precipitator is connected to the inlet of the fan through pipes. The outlet of the fan is connected to the chimney through pipes.

[0011] In the above system, the discharge port of the bag filter and the bottom ash hopper are opposite each other.

[0012] In the above system, a second water-cooled heat exchanger is installed in the pipeline between the desulfurization tower and the electrostatic precipitator.

[0013] In the above system, the cyclone preheater, the first cyclone separator, the suspension heating furnace, the suspension vulcanization roasting furnace, the second cyclone separator, the cooler, the third cyclone separator, the first water-cooled heat exchanger, and the second water-cooled heat exchanger are all equipped with temperature and pressure sensors to monitor the temperature and pressure at each point.

[0014] The present invention discloses a suspension sulfidation roasting process for malachite-type refractory copper oxide ore, which is carried out according to the following steps:

[0015] 1. The crushed and ground malachite-type copper oxide ore raw material is fed into the first hopper. The particle size of the crushed and ground raw material is -1mm.

[0016] 2. Start the burner and introduce natural gas and air into the burner to generate high-temperature flue gas. Feed the high-temperature flue gas into the bottom of the suspension heating furnace. Start the fan to create negative pressure in the bag filter, cyclone preheater, suspension heating furnace and cyclone separator. Under the action of negative pressure, the high-temperature flue gas passes through the suspension heating furnace, cyclone separator and cyclone preheater in sequence.

[0017] 3. The raw material in the first silo 1 is fed into the first screw feeder. The first screw feeder is started and the raw material is continuously fed into the feed pipe between the first cyclone separator and the cyclone preheater. Under the action of negative pressure and high temperature flue gas, the material flows into the cyclone preheater and is preheated. The preheated material is fed into the flow sealing valve and then into the suspension heating furnace. The preheated material is in a suspended state under the action of high temperature flue gas, and is heated and undergoes a decomposition reaction to form heated material. The heated material and high temperature flue gas are fed into the first cyclone separator through the pipe at the top of the suspension heating furnace. After gas-solid separation, the heated material is discharged from the discharge port at the bottom of the first cyclone separator.

[0018] 4. Feed the vulcanizing agent in the second silo into the second screw feeder, start the second screw feeder, and continuously feed the vulcanizing agent of the second screw feeder and the heated material discharged from the lower outlet of the first cyclone separator into the suspension vulcanization roasting furnace. Introduce nitrogen into the furnace. Under neutral atmosphere conditions, the heated material and the vulcanizing agent undergo a vulcanization reaction and suspension vulcanization roasting. The roasted vulcanized material is fed into the second cyclone separator through the outlet of the suspension vulcanization roasting furnace.

[0019] 5. After gas-solid separation by the second cyclone separator, the high-temperature waste gas is fed into the suspension heating furnace, and the sulfided material is fed into the cooler. In the cooler, the sulfided material and the fed nitrogen gas exchange heat in a countercurrent manner. The cooled material after heat exchange is fed into the third cyclone separator for secondary gas-solid separation.

[0020] 6. The material cooled after the secondary gas-solid separation is fed into the first water-cooled heat exchanger and then into the stirred mill for fine grinding. The finely ground material discharged from the stirred mill outlet is fed into the flotation machine for flotation, and the resulting frothy product is copper concentrate.

[0021] In the above method, the flue gas from the cyclone preheater and the third cyclone separator enters the bag filter for primary dust removal. The dust enters the ash hopper. The primary exhaust gas after being removed by the bag filter is discharged through the outlet and then passes through the desulfurization tower for desulfurization, the second water-cooled heat exchanger for cooling, and then enters the electrostatic precipitator for secondary dust removal. The exhaust gas after secondary dust removal is discharged from the chimney by the fan.

[0022] In step 3 above, the temperature of the material after preheating by the cyclone preheater is 300-450℃, the temperature at which the preheated material undergoes decomposition reaction in the suspension heating furnace is 600-800℃, and the residence time of the preheated material in the suspension heating furnace is 1-5 minutes.

[0023] In step 3 above, the main reaction formula during the decomposition reaction of the preheated material is:

[0024] CuCO3·Cu(OH)2 = 2CuO + CO2 + H2O (1)

[0025] In step 4 above, the sulfiding agent used is pyrite.

[0026] In step 4 above, the amount of vulcanizing agent added is 0.15 to 0.5 according to the molar ratio of FeS2 to CuO in the heated material, the reaction temperature of the heated material and the vulcanizing agent in the suspension vulcanization roasting furnace is 500 to 700°C, and the roasting time is 15 to 30 minutes.

[0027] In step 4 above, the main reaction formula when the vulcanizing agent and the heated material react is:

[0028] 8CuO + 9 / 2FeS2 = 3 / 2Fe3O4 + SO2 + 8CuS (2)

[0029] 14CuO + 6FeS2 = 3CuFe2O4 + SO2 + 11CuS (3)

[0030] In step 5 above, the temperature of the material cooled after heat exchange in the cooler is ≤200℃.

[0031] In step 6 above, the temperature of the material after secondary cooling after heat exchange in the first water-cooled heat exchanger is ≤80℃.

[0032] In step 6 above, the particle size of the material after fine grinding in the stirred mill is -0.038mm, accounting for 50-95%.

[0033] In step 6 above, the collector used in the flotation machine is a xanthate collector, the copper concentrate contains ≥20% Cu by mass percentage, and the copper recovery rate is ≥85%.

[0034] The basic principle of this invention is that malachite-type refractory copper oxide ore is preheated by cyclone and then heated in suspension, causing the copper-containing mineral malachite (CuCO3·Cu(OH)2) to rapidly dehydrate and decarbonize into uniform copper oxide (CuO) mineral. Under the heat storage conditions of the heated material itself, a sulfidation reaction occurs with a sulfiding agent in suspension, thereby converting the malachite in the raw material into copper sulfide mineral. The copper oxide mineral is then recovered through conventional flotation.

[0035] The beneficial effects of this invention are:

[0036] This invention's system, through multi-stage suspension roasting, effectively controls product quality and achieves precise phase transformation of malachite minerals during decomposition and sulfidation, thereby converting copper oxide ore into copper sulfide ore with uniform product properties. Compared with existing surface sulfidation processes for treating copper oxide ore, this invention's system boasts high sulfidation roasting efficiency, uses inexpensive and low-volume sulfidating agents, produces stable sulfide minerals, and facilitates conventional flotation separation. Furthermore, the preheating of each stage within the system is effectively utilized, the equipment and technology are mature, the processing capacity is large, and it is suitable for industrial operation. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the malachite-type refractory copper oxide ore suspension sulfidation roasting treatment system of the present invention;

[0038] In the diagram, 1. First silo, 2. First screw feeder, 3. Cyclone preheater, 4. First cyclone separator, 5. Suspension heating furnace, 6. Second silo, 7. Second screw feeder, 8. Suspension sulfurization roasting furnace, 9. Second cyclone separator, 10. Cooler, 11. Third cyclone separator, 12. First water-cooled heat exchanger, 13. Stirred mill, 14. Flotation machine, 15. Burner, 16. Flow sealing valve, 17. Ash hopper, 18. Bag filter, 19. Desulfurization tower, 20. Second water-cooled heat exchanger, 21. Electrostatic precipitator, 22. Fan, 23. Chimney. Detailed Implementation

[0039] To further describe the present invention, the method of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] The malachite-type refractory copper oxide ore used in the embodiments of the present invention has a copper grade of 0.5-4% and contains, by weight percentage, 1-6% TFe, 50-70% SiO2, 6-18% Al2O3, 0.2-3% CaO, 2-8% MgO, and 0.1-0.5% S.

[0041] Example 1

[0042] A schematic diagram of a suspension sulfidation roasting system for malachite-type refractory copper oxide ore is shown below. Figure 1 As shown, it includes 1. First silo, 2. First screw feeder, 3. Cyclone preheater, 4. First cyclone separator, 5. Suspension heating furnace, 6. Second silo, 7. Second screw feeder, 8. Suspension sulfurization roasting furnace, 9. Second cyclone separator, 10. Cooler, 11. Third cyclone separator, 12. First water-cooled heat exchanger, 13. Stirred mill, 14. Flotation machine, 15. Burner, 16. Flow sealing valve, 17. Ash hopper, 18. Bag filter, 19. Desulfurization tower, 20. Second water-cooled heat exchanger, 21. Electrostatic precipitator, 22. Fan, 23. Chimney;

[0043] The discharge port of the first hopper 1 is connected to the inlet of the first screw feeder 2. The discharge port of the first screw feeder 2 is connected to the inlet of the cyclone preheater 3 via a pipe. The discharge port of the cyclone preheater 3 is connected to the inlet of the flow sealing valve 16. The discharge port of the flow sealing valve 16 is connected to the inlet of the suspension heating furnace 5. The suspension heating furnace 5 has an air inlet at the bottom, which is connected to the burner 15. The discharge port at the top of the suspension heating furnace 5 is connected to the inlet of the first cyclone separator 4 via a pipe. The discharge port of the first cyclone separator 4 is connected to the inlet of the second screw feeder 7. The discharge port of the suspended sulfur roasting furnace 8 is connected to the inlet of the suspension sulfur roasting furnace 8 through a pipeline; the discharge port of the suspended sulfur roasting furnace 8 is connected to the inlet of the second cyclone separator 9; the discharge port of the second cyclone separator 9 is connected to the inlet of the cooler 10; the discharge port of the cooler 10 is connected to the inlet of the third cyclone separator 11; the discharge port of the third cyclone separator 11 is connected to the inlet of the stirred mill 13 through a pipeline; the pipeline between the third cyclone separator 11 and the stirred mill 13 is equipped with a first water-cooled heat exchanger 12; and the discharge port of the stirred mill 13 is connected to the flotation machine 14.

[0044] The outlet of the first cyclone separator 4 is connected to the inlet of the cyclone preheater 3 via a pipe.

[0045] The inlet of the second screw feeder 7 is connected to the outlet of the second hopper 6;

[0046] The outlet of the second cyclone separator 9 is connected to the bottom air inlet of the suspension heating furnace 5;

[0047] The air inlet of cooler 10 is connected to nitrogen;

[0048] The air inlet at the bottom of the suspension vulcanization roasting furnace 8 is connected to nitrogen.

[0049] The outlets of the cyclone preheater 3 and the third cyclone separator 11 are connected to the inlet of the bag filter 18 through pipes. The outlet of the bag filter 18 is opposite to the ash hopper 17 located at its bottom. The outlet of the bag filter 18 is connected to the inlet of the desulfurization tower 19 through pipes. The outlet of the desulfurization tower 19 is connected to the inlet of the electrostatic precipitator 21 through pipes. A second water-cooled heat exchanger 20 is installed in the pipe between the desulfurization tower 19 and the electrostatic precipitator 21. The outlet of the electrostatic precipitator 21 is connected to the inlet of the fan 22. The outlet of the fan 22 is connected to the chimney 23 through pipes.

[0050] A suspension sulfidation roasting process for malachite-type refractory copper oxide ore, implemented using the above-mentioned system, is carried out according to the following steps:

[0051] The copper grade of the malachite-type refractory copper oxide ore is 0.67%, and by weight percentage contains 5.64% TFe, 68.33% SiO2, 17.35% Al2O3, 2.88% CaO, 7.62% MgO, and 0.48% S.

[0052] The crushed and ground malachite-type copper oxide ore raw material is fed into the first hopper 1. The particle size of the crushed and ground raw material is -1mm.

[0053] Start the burner 15 and introduce natural gas and air into the burner 15 to burn and generate high-temperature flue gas. Feed the high-temperature flue gas into the bottom of the suspension heating furnace 5. Start the fan 22 to create a negative pressure in the bag filter 18, cyclone preheater 3, suspension heating furnace 5 and first cyclone separator 4. Under the action of negative pressure, the high-temperature flue gas passes through the suspension heating furnace 5, the first cyclone separator 4 and the cyclone preheater 3 in sequence.

[0054] The raw material in the first silo 1 is fed into the first screw feeder 2. The first screw feeder 2 is started, and the raw material is continuously fed into the feed pipe between the first cyclone separator 4 and the cyclone preheater 3. Under the action of negative pressure and high temperature flue gas, the material flows into the cyclone preheater 3 and is preheated by the cyclone preheater 3. The temperature of the preheated material after preheating is 320℃. The preheated material is fed into the flow sealing valve 16 and then into the suspension heating furnace 5. The preheated material is in a suspended state under the action of high temperature flue gas. It is heated to 620℃ and undergoes a decomposition reaction to form heated material. The residence time of the heated material in the suspension heating furnace 5 is 4.5 minutes. The heated material and high temperature flue gas are fed into the first cyclone separator 4 through the pipe at the top of the suspension heating furnace 5. After gas-solid separation, the heated material is discharged from the discharge port at the bottom of the first cyclone separator 4.

[0055] The sulfiding agent pyrite in the second silo 6 is fed into the second screw feeder 7. The second screw feeder 7 is started, and the sulfiding agent in the second screw feeder 7 and the heated material discharged from the lower outlet of the first cyclone separator 4 are continuously fed into the suspension sulfidation roasting furnace 8. The amount of sulfiding agent added is 0.20 according to the molar ratio of FeS2 to CuO in the heated material. Nitrogen gas is introduced into the furnace. Under neutral atmosphere conditions, the heated material and the sulfiding agent undergo a sulfidation reaction at a reaction temperature of 520℃. Suspension sulfidation roasting is carried out for 28 minutes. The roasted sulfided material is fed into the second cyclone separator 9 through the outlet of the suspension sulfidation roasting furnace 8.

[0056] After gas-solid separation by the second cyclone separator 9, the high-temperature waste gas is fed into the suspension heating furnace 5 to heat the furnace body, and the sulfided material is fed into the cooler 10. In the cooler 10, the sulfided material and the fed nitrogen gas exchange heat in a countercurrent manner. The temperature of the first-cooled material after heat exchange is 120°C. The first-cooled material is fed into the third cyclone separator 11 for secondary gas-solid separation.

[0057] The material cooled after the secondary gas-solid separation passes through the first water-cooled heat exchanger 12. After water cooling, the temperature of the material cooled for the second time is 40°C. The material is then fed into a stirred mill 13 for fine grinding. The finely ground material discharged from the outlet of the stirred mill 13 has a particle size of -0.038mm, accounting for 92%. The finely ground material is then fed into a flotation machine 14 for flotation. The collector used is a xanthate collector. The resulting froth product is copper concentrate, which contains 20.85% Cu by mass percentage, with a copper recovery rate of 85.78%.

[0058] Example 2

[0059] The system and steps are the same as in Example 1, except that:

[0060] (1) The copper grade of the malachite-type refractory copper oxide ore used in this embodiment is 3.72%, and it contains 1.17% TFe, 51.88% SiO2, 6.87% Al2O3, 0.29% CaO, 2.18% MgO, and 0.19% S by weight percentage;

[0061] (2) The temperature of the material after preheating by the cyclone preheater 3 is 440℃, the temperature at which the preheated material undergoes decomposition reaction in the suspension heating furnace 5 is 780℃, and the residence time of the preheated material in the suspension heating furnace is 1.2min.

[0062] (3) The amount of sulfiding agent added is based on the molar ratio of FeS2 to CuO in the heated material being 0.45. The reaction temperature of the heated material and the sulfiding agent in the suspension sulfidation roasting furnace 8 is 680℃, and the roasting time is 17min.

[0063] (4) The temperature of the material after primary cooling through the heat exchanger 10 is 190℃;

[0064] (5) The temperature of the material after secondary cooling after heat exchange in the first water-cooled heat exchanger 12 is 75℃.

[0065] (6) The particle size of the material after fine grinding in the stirred mill 13 is -0.038mm, accounting for 65%. The copper concentrate contains 33.56% Cu by mass percentage, and the copper recovery rate is 92.12%.

[0066] Example 3

[0067] The system and steps are the same as in Example 1, except that:

[0068] (1) The copper grade of the malachite-type refractory copper oxide ore used in this embodiment is 2.75%, and by weight percentage contains 2.21% TFe, 60.64% SiO2, 11.96% Al2O3, 2.35% CaO, 5.33% MgO, and 0.27% S;

[0069] (2) The temperature of the material after preheating by the cyclone preheater 3 is 420℃, the temperature at which the preheated material undergoes decomposition reaction in the suspension heating furnace 5 is 720℃, and the residence time of the preheated material in the suspension heating furnace is 3min.

[0070] (3) The amount of sulfiding agent added is based on the molar ratio of FeS2 to CuO in the heated material being 0.33. The reaction temperature of the heated material and the sulfiding agent in the suspension sulfidation roasting furnace 8 is 620℃, and the roasting time is 20min.

[0071] (4) The temperature of the material after primary cooling through the heat exchanger 10 is 160℃;

[0072] (5) The temperature of the material after secondary cooling after heat exchange in the first water-cooled heat exchanger 12 is 65℃;

[0073] (6) The particle size of the material after fine grinding in the stirred mill 13 is -0.038mm, accounting for 85%. The copper concentrate contains 26.89% Cu by mass percentage, and the copper recovery rate is 89.95%.

[0074] Example 4

[0075] The system and steps are the same as in Example 1, except that:

[0076] (1) The copper grade of the malachite-type refractory copper oxide ore used in this embodiment is 1.48%, and it contains 1.91% TFe, 65.33% SiO2, 15.15% Al2O3, 2.09% CaO, 6.67% MgO, and 0.24% S by weight percentage;

[0077] (2) The temperature of the material after preheating by the cyclone preheater 3 is 400℃, the temperature at which the preheated material undergoes decomposition reaction in the suspension heating furnace 5 is 700℃, and the residence time of the preheated material in the suspension heating furnace is 3.5min.

[0078] (3) The amount of sulfiding agent added is based on the molar ratio of FeS2 to CuO in the heated material being 0.40. The reaction temperature of the heated material and the sulfiding agent in the suspension sulfidation roasting furnace 8 is 580℃, and the roasting time is 22min.

[0079] (4) The temperature of the material after primary cooling through the heat exchanger 10 is 140℃;

[0080] (5) The temperature of the material after secondary cooling after heat exchange in the first water-cooled heat exchanger 12 is 50℃.

[0081] (6) The particle size of the material after fine grinding in the stirred mill 13 is -0.038mm, accounting for 80%. The copper concentrate contains 23.96% Cu by mass percentage, and the copper recovery rate is 87.80%.

Claims

1. A suspension sulfidation roasting system for malachite-type refractory copper oxide ore, characterized in that... It includes a first silo (1), a first screw feeder (2), a cyclone preheater (3), a first cyclone separator (4), a suspension heating furnace (5), a second silo (6), a second screw feeder (7), a suspension sulfurization roasting furnace (8), a second cyclone separator (9), a cooler (10), a third cyclone separator (11), a first water-cooled heat exchanger (12), a stirred mill (13), a flotation machine (14), a burner (15), a flow sealing valve (16), an ash hopper (17), a bag filter (18), a desulfurization tower (19), a second water-cooled heat exchanger (20), an electrostatic precipitator (21), a fan (22), and a chimney (23). The discharge port of the first silo (1) is connected to the inlet of the first screw feeder (2). The discharge port of the first screw feeder (2) is connected to the inlet of the cyclone preheater (3) through a pipe. The discharge port of the cyclone preheater (3) is connected to the inlet of the flow sealing valve (16). The discharge port of the flow sealing valve (16) is connected to the inlet of the suspension heating furnace (5). The suspension heating furnace (5) has an air inlet at the bottom, which is connected to the burner (15). The discharge port at the top of the suspension heating furnace (5) is connected to the inlet of the first cyclone separator (4) through a pipe. The discharge port of the separator (4) and the discharge port of the second spiral feeder (7) are connected to the feed port of the suspension sulfidation roasting furnace (8) through a pipeline; the discharge port of the suspension sulfidation roasting furnace (8) is connected to the feed port of the second cyclone separator (9), the discharge port of the second cyclone separator (9) is connected to the feed port of the cooler (10), the discharge port of the cooler (10) is connected to the feed port of the third cyclone separator (11), the discharge port of the third cyclone separator (11) is connected to the feed port of the stirred mill (13) through a pipeline, and the discharge port of the stirred mill (13) is connected to the flotation machine (14).

2. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The pipeline between the third cyclone separator (11) and the stirred mill (13) is equipped with a first water-cooled heat exchanger (12).

3. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The outlet of the first cyclone separator (4) is connected to the inlet of the cyclone preheater (3) through a pipe.

4. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The feed inlet of the second screw feeder (7) is connected to the discharge outlet of the second hopper (6).

5. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The outlet of the second cyclone separator (9) is connected to the bottom inlet of the suspension heating furnace (5).

6. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The outlets of the cyclone preheater (3) and the third cyclone separator (11) are connected to the inlet of the bag filter (18) through pipes. The outlet of the bag filter (18) is connected to the inlet of the desulfurization tower (19) through pipes. The outlet of the desulfurization tower (19) is connected to the inlet of the electrostatic precipitator (21) through pipes. The outlet of the electrostatic precipitator (21) is connected to the inlet of the fan (22). The outlet of the fan (22) is connected to the chimney (23) through pipes.

7. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The discharge port and the bottom ash hopper (17) of the bag filter (18) are opposite each other.

8. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 6, characterized in that... The pipeline between the desulfurization tower (19) and the electrostatic precipitator (21) is equipped with a second water-cooled heat exchanger (20).

9. The suspension sulfidation roasting system for malachite-type refractory copper oxide ore according to claim 1, characterized in that... The cyclone preheater (3), the first cyclone separator (4), the suspension heating furnace (5), the suspension sulfurization roasting furnace (8), the second cyclone separator (9), the cooler (10), the third cyclone separator (11), the first water-cooled heat exchanger (12), and the second water-cooled heat exchanger (20) are all equipped with temperature and pressure sensors to monitor the temperature and pressure at each point in real time.

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