Copper smelting method of slag-metal double-weir non-immersion top side collaborative injection Ausmelt furnace

Abstract

The invention discloses a copper smelting method of a slag-metal double-weir non-immersion top-side collaborative injection Ausmelt furnace, and relates to the technical field of copper smelting of Ausmelt furnaces, and the copper smelting method comprises the following steps: (1) injecting coal powder and mineral powder into a molten pool through a side-blowing coal gun and a mineral gun of the double-weir and mineral-coal collaborative injection Ausmelt furnace; (2) hot air is blown through a central combustion gun lowered from the top of the Ausmelt furnace with double weir crests and mineral coal collaborative blowing, and a side blowing combustion gun is used as heat supplement; and (3) after the reaction is finished, raising the central combustion gun, recording the temperature distribution of the melt, detecting the viscosity of the molten slag, and taking a slag sample for analyzing the content of Fe3O4. The Ausmelt furnace comprises a flue, a central combustion gun, a side-blowing combustion gun, a slag hole, a side-blowing ore gun, a side-blowing coal gun and a siphon weir crest, according to the method, the problem that the viscosity of slag is increased in the conventional Ausmelt furnace copper smelting process is solved, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of copper smelting of an Ausmelt furnace, and in particular to a copper smelting method of an Ausmelt furnace with non-submerged top side coordinated injection of slag and metal double weirs. Background Art

[0002] The current technical feature of the Ausmelt furnace is the use of a single-weir submerged single Siro lance, which is mainly used for smelting non-ferrous metal ores such as copper, lead, tin, and nickel. This single-weir submerged single Siro lance configuration is the core equipment of the Ausmelt furnace. It blows the coal and combustion-supporting air into the molten pool in a high-speed vortex flow and makes the molten pool in a violent turbulent state. The lance is immersed in the molten pool, and the fuel and process gas (air and additional oxygen) are sprayed into the molten pool through the lance, forming a strong stirring of the slag. The submerged center lance consists of a specially designed four-layer concentric sleeve: the innermost layer is pulverized coal and air (coal-carrying air); the second layer is oxygen; the third layer is air (spray gun air); the outermost layer is sleeve air (sleeve air) to protect the third layer of copper sleeve wall, and is also used to burn sulfur and other combustible components (mainly CO) in the flue gas. During operation, the spray gun is inserted from the top of the furnace into the melt in the vertically placed cylindrical furnace chamber. Air (or oxygen-enriched air) and fuel (oil, natural gas or pulverized coal) are sprayed into the melt from the end of the spray gun, creating a violently churning molten pool surface in the furnace. The charge is directly added into the churning molten pool from the top charging port.

[0003] In the existing production process, there is a large temperature gradient in the melt layer. The Fe3O4 in the slag will be saturated or nearly saturated in some local areas of the molten pool, forming sticky slag. In severe cases, it will become furnace agglomeration, reducing the volume of the molten pool. Therefore, reducing the temperature gradient, reasonably controlling the melt temperature, and reducing the harm of sticky slag are one of the key issues in production operations. It is generally believed that the content of Fe3O4 in the slag needs to be controlled below 15%.

[0004] The single weir submerged injection design of the Ausmelt furnace has major production defects: 1. Single weir mouth without slag mouth design, the melt discharge is on the opposite side of the feeding port, the temperature of the feeding side of the molten pool is high, and the temperature of the melt discharge side is high, resulting in a large temperature gradient in the molten pool, affecting the sufficiency of the reaction, deteriorating the viscosity and other characteristics of the slag, making it difficult to separate the slag and gold, which is not conducive to the subsequent processing steps.

[0005] 2. The submerged spray gun will inevitably be corroded and damaged due to long-term immersion. It cannot be replaced or repaired except for stopping the furnace and stopping production, which is not conducive to continuous production.

[0006] 3. The furnace body is large, the molten pool is shallow, the overall filling rate of the furnace body is low, the utilization efficiency is low, the heat exchange rate is low, and the energy loss rate is high. If the molten pool is too shallow, the use of immersion injection will cause the slag and gold to mix, and the subsequent electric furnace slag separation will increase the process and energy consumption. If a sedimentation pool can be formed to separate the slag and gold in the furnace, the production efficiency can be greatly increased. Summary of the invention

[0007] In view of the problems mentioned in the background technology, the present invention provides a copper smelting method of an Ausmelt furnace with non-submerged top and side coordinated injection of slag and metal by double weirs, which solves the following problems existing in the smelting process of the Ausmelt furnace: corrosion problem of the submerged injection lance, slag-metal mixing problem caused by the submerged injection, redundant process design problem of the need for subsequent electric furnace slag separation for the mixed slag and metal discharged by a single weir, problem of uneven temperature field in the molten pool caused by the design of a single weir and side feeding, as well as low molten pool height, slender furnace, too long lance, too low filling rate of the furnace body, and low energy utilization rate.

[0008] The copper smelting method of the Ausmelt furnace with slag-metal double weirs and coordinated injection of coal and minerals of the present invention comprises the following specific steps: (1) After the pulverized coal and raw ore are ground and selected, they are sprayed into the molten pool through the side-blowing coal gun and side-blowing ore gun of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs; (2) The central lance descending from the top of the Ausmelt furnace with double weirs and non-submerged top side coordinated injection of slag and metal provides heat for the furnace body and the molten pool by spraying hot air, and the side-blowing lance of the Ausmelt furnace with double weirs and non-submerged top side coordinated injection of slag and metal serves as a heat supplement; (3) After the reaction is completed, raise the central burner, record the melt temperature distribution, detect the slag viscosity, and take slag samples for Fe3O4 content analysis.

[0009] Furthermore, the Ausmelt furnace with double slag-metal weirs and coordinated coal injection of ore described in the present invention comprises: a flue, a central combustion gun, a side-blowing combustion gun, a slag port, a side-blowing ore gun, a side-blowing coal gun, and a siphon weir. The furnace is divided into the combustion zone, slag layer and molten pool from top to bottom. A flue is arranged on the upper part of the Ausmelt furnace, and a central lance is arranged at the center of the top, 2000mm~3000mm above the horizontal plane of the molten pool; the double slag opening is arranged in the middle of the combustion zone and the slag layer, the center line of the slag opening is 2500mm~3500mm away from the bottom of the furnace, the size is a rectangular opening of 750mm~950mm square or a circular hole of 650mm~850mm in diameter, and it is symmetrically distributed on the furnace body; the blowing inlet of the side-blowing lance is located in the combustion zone, the opening center line of the side-blowing lance on the furnace body is 5000mm~6000mm away from the bottom of the furnace, the center line of the side-blowing lance muzzle extending into the furnace body is 1500mm~2500mm away from the horizontal plane of the molten pool, and it is symmetrically distributed on the furnace body; side-blowing The blowing inlet of the coal gun is located in the slag layer, the opening center line of the side-blowing coal gun on the furnace body is 2500mm~3500mm away from the furnace bottom, the center line of the side-blowing coal gun muzzle extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and they are symmetrically distributed on the furnace body; the blowing inlet of the side-blowing ore gun is located in the slag layer, the opening center line of the side-blowing ore gun on the furnace body is 2500mm~3500mm away from the furnace bottom, the center line of the side-blowing ore gun muzzle extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and they are symmetrically distributed on the furnace body; two siphon weirs are set at both ends of the bottom molten pool, the center line of the siphon weir is 500mm~700mm away from the furnace bottom, and the size is a rectangular opening of 750mm~950mm square or a circular hole of 650mm~850mm in diameter.

[0010] The central burner adopts a non-submerged top-blowing method, which will not cause direct and long-term corrosion to the burner. Its main function is to spray fuel to form a combustion heat exchange zone above the liquid surface. While maintaining the heat demand of the molten pool, it performs secondary combustion on the flue gas and smoke generated by the molten pool, buffers the flue gas flow rate, and reduces the scouring and corrosion of the flue by metal particles in the smoke and dust.

[0011] The function of the side-blowing lance is to assist fuel injection, provide heat to the edge slag layer, and play a role in rotational stirring, so that the temperature gradient of the slag layer is uniform, reducing the formation of Fe3O4 and the adverse effect of Fe3O4 on the increase of slag viscosity.

[0012] The double slag ports and double siphon weir ports are vertically and symmetrically distributed on the furnace body, which is beneficial to the uniform dissipation of heat in the molten pool and avoids the mixing of slag and metal.

[0013] The side-blowing lance is inserted into the slag layer to form a "bubbling" molten pool stirring, making the reaction more complete.

[0014] The side-blowing coal gun is inserted into the slag layer to promote the slag-forming reaction and directly act on Fe3O4 in the slag to promote its reduction.

[0015] The side-blowing ore gun and the side-blowing coal gun have the same specifications and have the function of replacing each other in production.

[0016] The symmetrical side-blowing combustion guns, side-blowing coal guns and side-blowing ore guns are all opened and closed at the same time, and the copper matte is discharged according to the target grade.

[0017] Furthermore, in step (1), the main components and contents of the raw ore are Cu: 22%~25%, S: 26%~31%, Fe: 25%~30%, SiO2: 5%~7%, CaO: 1.5%~3%; the particle size of the ore powder is 1.25mm~8mm, and the particle size of the coal powder is 0.1mm~6mm.

[0018] Furthermore, in step (1), the side-blowing coal gun and the side-blowing ore gun use normal temperature air or nitrogen to pressurize and convey the coal powder and ore powder. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 100 kPa~200 kPa, and the air supply flow rate is 800 Nm 3 / h~1600Nm 3 / h.

[0019] Furthermore, in step (2), the heat of the hot air is generated by the combustion of heavy oil or natural gas, the gauge pressure of the central burner is 400kPa~500kPa, and the gas flow rate is 3500Nm 3 / h~4500Nm 3 / h.

[0020] Furthermore, in step (2), the central burner is lowered to 2000 mm to 3000 mm above the horizontal plane of the molten pool during operation; the central burner is a conventional fuel spray gun with a three-layer jacket structure, the innermost layer is fuel (solid and liquid fuels such as coal powder and heavy oil), the middle layer is oxygen-enriched air (oxygen content is more than 75%), and the outermost layer is a water cooling jacket.

[0021] Furthermore, in step (2), the side-blowing burner is a conventional fuel spray gun with a three-layer jacket structure, the innermost layer is fuel (gaseous fuel such as CO, natural gas, etc.), the middle layer is oxygen-enriched air (oxygen content is more than 75%), and the outermost layer is a water-cooling jacket.

[0022] Furthermore, in step (2), the gauge pressure of a single side-blowing burner is 200 kPa-300 kPa, and the gas flow rate is 2000 Nm 3 / h~3000Nm 3 / h.

[0023] Furthermore, in step (3), the molten pool depth is 3000 mm to 4000 mm, the temperature difference between the center temperature of the slag and the temperature at the side wall does not exceed 150°C, the average content of Fe3O4 in the slag is not higher than 15%, the difference in Fe3O4 concentration between the center position and the side wall position does not exceed 7%, and the viscosity of the slag is less than or equal to 1.5 Pa·s.

[0024] Beneficial effects of the present invention: 1. The non-submerged top-blowing lance will not cause direct and long-term corrosion to the lance. Its main function is to spray fuel and form a combustion heat exchange zone above the liquid surface. While maintaining the heat demand of the molten pool, it can perform secondary combustion on the flue gas and smoke generated by the molten pool, buffer the flue gas flow rate, and reduce the scouring and corrosion of the flue by metal particles in the smoke and dust; 2. Set up a side-blowing lance to assist in fuel injection, provide heat to the edge slag layer, and play a role in rotation and stirring, so that the temperature gradient of the slag layer is uniform, reducing the formation of Fe3O4 and the adverse effect of Fe3O4 on the increase of slag viscosity; 3. The symmetrical distribution design of double slag ports and double weir ports is conducive to the uniform dissipation of heat in the molten pool. The slag ports and weir ports are vertically cross-distributed, which effectively avoids the mixing of slag and copper matte. 4. The ore gun is inserted into the slag-metal interface to form a "spring-like" molten pool stirring to make the reaction more complete; 5. The coal gun is inserted into the slag layer to promote the slag-making reaction and directly act on Fe3O4 in the slag to promote its reduction; 6. Increase the height of the molten pool, which is 1.5~2 times the existing molten pool height of Ausmelt furnace (about 2000mm). No blast stirring is performed on the metal molten pool, but only stirring is performed on the slag-metal interface to promote the exchange of valuable metal elements in the interface chemical reaction, so that the metal molten pool below forms a sedimentation pool, and the slag-metal layer is continuously formed. There is no need for subsequent electric furnace slag separation, which saves processes and increases the efficiency of the furnace body. 7. The specifications of the ore gun and the coal gun are consistent. When problems occur during the production cycle, the production functions can be replaced at any time, and the side-blowing spray gun can be replaced in sequence. There is no need to stop production for overhaul, and continuous production can be achieved for a longer period of time; 8. The Ausmelt furnace designed by the present invention is suitable for steel and nonferrous metallurgy and can be used as a universal smelting furnace model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic front cross-sectional view of an Ausmelt furnace used in an embodiment of the present invention.

[0026] Figure 2 A top cross-sectional view of an Ausmelt furnace used in an embodiment of the present invention.

[0027] Figure numerals: 1. flue, 2. central combustion gun, 3. side-blowing combustion gun, 4. slag mouth, 5. side-blowing ore gun, 6. side-blowing coal gun, 7. siphon weir mouth, 8. combustion zone, 9. slag layer, 10. copper matte molten pool. DETAILED DESCRIPTION

[0028] The following will be combined with the attached embodiment of the present invention Figure 1-2 , clearly and completely describe the technical solution of the present invention.

[0029] A copper smelting method using an Ausmelt furnace with double weirs for non-submerged top side coordinated injection of slag and metal, wherein the structure of the Ausmelt furnace with double weirs for non-submerged top side coordinated injection of slag and metal (hereinafter referred to as the Ausmelt furnace) is as follows: Figure 1-2 As shown, it includes: a flue 1, a central combustion gun 2, a side-blowing combustion gun 3, a slag outlet 4, a side-blowing ore gun 5, a side-blowing coal gun 6, and a siphon weir 7.

[0030] The Ausmelt furnace is divided into a combustion zone 8, a slag layer 9 and a copper matte molten pool 10 from top to bottom. A flue 1 is arranged on the upper part of the Ausmelt furnace, and a central lance 2 is arranged at the center of the top, and the central lance is 2000mm~3000mm above the horizontal plane of the molten pool; two slag openings 4 are arranged between the combustion zone 8 and the slag layer 9, and the center line of the slag opening is 2500mm~3500mm away from the furnace bottom, and the size is a rectangular opening of 750mm~950mm square or a circular hole of 650mm~850mm in diameter, and they are symmetrically distributed on the furnace body; the blowing inlets of the two side-blowing lances 3 are located in the combustion zone 8, and the center line of the opening of the side-blowing lance on the furnace body is 5000mm~6000mm away from the furnace bottom, and the center line of the muzzle of the side-blowing lance extending into the furnace body is 1500mm~2500mm away from the horizontal plane of the molten pool, and they are symmetrically distributed on the furnace body The blowing inlets of the two side-blowing coal guns 6 are located in the slag layer 9, the center line of the opening of the side-blowing coal gun on the furnace body is 2500mm~3500mm away from the furnace bottom, the center line of the side-blowing coal gun muzzle extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and are symmetrically distributed on the furnace body; the blowing inlets of the two side-blowing ore guns 5 are located in the slag layer 9, the center line of the opening of the side-blowing ore gun on the furnace body is 2500mm~3500mm away from the furnace bottom, the center line of the side-blowing ore gun muzzle extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and are symmetrically distributed on the furnace body; two siphon weirs 7 are set at both ends of the bottom copper matte molten pool 10, the center line of the siphon weir is 500mm~700mm away from the furnace bottom, and the size is a rectangular opening of 750mm~950mm square or a circular hole with a diameter of 650mm~850mm.

[0031] The double slag ports 4 and the double siphon weir ports 7 are vertically and symmetrically distributed on the furnace body; the side-blowing ore gun 5 and the side-blowing coal gun 6 have the same specifications.

[0032] The side-blowing lance 3, the central lance 2, the side-blowing ore lance 5 and the side-blowing coal lance 6 start working simultaneously and work until the copper matte reaches the target grade.

[0033] The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs comprises the following specific steps: (1) After the pulverized coal and the raw ore are subjected to the grinding and selection process, they are sprayed into the designated position of the copper matte molten pool 10 through the side-blowing coal gun 6 and the side-blowing ore gun 5 of the Ausmelt furnace; (2) The central burner 2 sprays heavy oil, and the side burner 3 sprays natural gas to provide heat for the furnace body and the copper matte molten pool 10; (3) When the copper matte grade reaches 58%, the central burner 2 is raised after the reaction is completed, the melt temperature distribution is recorded, the slag viscosity is tested, and the slag sample is taken for analysis.

[0034] Among them, the molten pool depth is 3000mm~4000mm, the temperature difference between the center and the side wall of the slag is less than 150℃, the average content of Fe3O4 in the slag is less than 15%, the concentration difference of Fe3O4 in the slag at the center and the side wall is less than 7%, and the viscosity of the slag is less than or equal to 1.5Pa·s.

[0035] The ore used in the following examples and comparative examples is copper sulfide ore, and the main components and contents of the ore are Cu: 22%~25%, S: 26%~31%, Fe: 25%~30%, SiO2: 5%~7%, CaO: 1.5%~3%. The material consumption during the smelting process is as follows: 155t / h of ore, 1.5t / h of lump coal, and 14t / h of river sand. The SiO2 content in the river sand is above 75%, which is used for slag making reaction. The particle size of the ore powder is 1.25mm~8mm, and the particle size of the coal powder is 0.1mm~6mm.

[0036] The parameters of the submerged central spray gun used in the comparative example are as follows: the submerged central spray gun has a 4-pack structure: the innermost layer is pulverized coal and air (coal-carrying air); the second layer is oxygen; the third layer is air (spray gun air); the outermost layer is sleeve air (sleeve air) that protects the third layer of copper wall. The total pressure of the central spray gun is 850kPa, and the total air supply flow rate is 3400Nm 3 / h. The innermost layer of coal powder injection has a particle size of 0.1~6mm and an injection volume of 3~5t / h. The coal-carrying air gauge pressure is 150kPa and the air supply flow rate is 600Nm 3 / h; the second layer oxygen gauge pressure is 300kPa, and the gas flow rate is 1200Nm 3 / h; the third layer air spray gun wind gauge pressure is 200kPa, the air flow rate is 800Nm 3 / h; sleeve air gauge pressure is 200kPa, air flow rate is 800Nm 3 / h.

[0037] The parameters of the non-submerged top-side coordinated blowing lance used in the embodiment are: the gauge pressure of the central burning lance 2 is 400kPa~450kPa, the gas flow rate is 3500Nm 3 / h~4500Nm 3 / h, the central burner 2 is 2000mm~3000mm above the horizontal plane of the molten pool; the gauge pressure of the single side-blowing burner 3 is maintained at 200kPa~300kPa, and the gas flow rate is 2000Nm 3 / h~3000Nm 3 / h; side-blowing coal gun 6 and side-blowing ore gun 5 use normal temperature air, the pressure used by a single side-blowing coal gun or side-blowing ore gun is 100kPa~200kPa, and the air supply flow rate is 800Nm 3 / h~1600Nm 3 / h.

[0038] When the copper matte grade reaches 58%, record the outer wall temperature of the top-blown central lance 2 and the temperature distribution of the melt, take slag samples and copper matte samples to detect and analyze the Fe3O4 content in the slag and the copper grade of copper sulfur, and release a portion of the copper matte and slag through the siphon weir 7 and slag outlet 4 to enter the subsequent process, stop discharging slag and copper matte after the molten pool height drops to about 2600mm, and continue to add materials to produce the target copper matte grade. The slag viscosity is tested in accordance with the YB / T 185-2017 standard.

[0039] Comparative Example 1 The conventional Ausmelt furnace is used to smelt copper sulfide ore through single weir immersion injection. The specific effects are as follows: (1) Record the temperature at the side wall and the center of the slag. The temperature at the center of the slag is as high as 1372.5°C, and the temperature at the side wall is 1099.5°C. The temperature difference between the center and the side wall of the slag is about 273°C. Too high a temperature difference will cause a large temperature gradient in the molten pool, affect the sufficiency of the reaction, deteriorate the viscosity of the slag, make it difficult to separate the slag and copper matte, and be unfavorable for subsequent processing; (2) The average Fe3O4 content of the slag is 17.7%, the difference in Fe3O4 concentration between the center and the side wall is about 9.3%, and the high-temperature viscosity of the slag is about 1.79 Pa·s. The high Fe3O4 content in the slag is easy to form sticky slag, resulting in increased slag viscosity, which may become furnace agglomeration in severe cases, reducing the volume of the molten pool.

[0040] Comparative Example 2 The conventional Ausmelt furnace is used to smelt copper sulfide ore, and it is improved to double weir immersion injection. The specific effects are as follows: (1) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1322.5°C, and the temperature at the slag side wall is 1111.5°C. The temperature difference between the slag center and the side wall is about 211°C. (2) The average Fe3O4 content of the slag is 16.1%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 8.2%. The high-temperature viscosity of the slag is about 1.58 Pa·s.

[0041] Comparative Example 3 The Ausmelt furnace with the slag-gold double weir non-submerged top-side coordinated injection of the present invention is used to smelt copper sulfide ore, but only single weir non-submerged top-side coordinated injection is adopted, and the specific effects are as follows: (1) The gauge pressure of the central burner 2 is 400 kPa and the gas flow rate is 3500 Nm 3 / h, the center burner 2 is 3000mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 200 kPa, and the gas flow rate is 2000 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 100 kPa, and the air supply flow rate is 800 Nm 3 / h; (4) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1343.5°C, and the temperature at the slag side wall is 1170.6°C. The temperature difference between the slag center and the side wall is about 173°C. (5) The average Fe3O4 content of the slag is 15.2%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 7.3%. The high-temperature viscosity of the slag is about 1.55 Pa·s.

[0042] Example 1 The Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and gold of the present invention is used to smelt copper sulfide ore, which is achieved by the double weir non-submerged top-side coordinated injection technology. The specific effects are as follows: (1) The gauge pressure of the central burner 2 is 400 kPa and the gas flow rate is 3500 Nm 3 / h, the center burner 2 is 3000mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 200 kPa, and the gas flow rate is 2000 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 100 kPa, and the air supply flow rate is 800 Nm 3 / h; (4) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1339.5°C, and the temperature at the slag side wall is 1192°C. The temperature difference between the slag center and the side wall is about 147.5°C. (5) The average Fe3O4 content of the slag is 13.7%, the difference in Fe3O4 concentration between the center and the side wall is about 6.5%, and the high-temperature viscosity of the slag is about 1.35 Pa·s. The temperature difference in the melt layer is small, the Fe3O4 content in the slag is low, and the slag viscosity is less than 1.5 Pa·s, which solves the problem of comparative example 1 and greatly increases production efficiency.

[0043] Example 2 The Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and gold of the present invention is used to smelt copper sulfide ore, which is achieved by double weir non-submerged top-side coordinated injection technology. The specific effects are as follows: (1) The gauge pressure of the central burner 2 is 425 kPa and the gas flow rate is 4000 Nm 3 / h, the center burner 2 is 2500mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 250 kPa, and the gas flow rate is 2500 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 150 kPa, and the air supply flow rate is 1200 Nm 3 / h; (4) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1332.5°C, and the temperature at the slag side wall is 1201.4°C. The temperature difference between the slag center and the side wall is about 131.1°C. (5) The average Fe3O4 content of the slag is 11.2%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 4.5%. The high-temperature viscosity of the slag is about 1.13 Pa·s.

[0044] Example 3 The Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and gold of the present invention is used to smelt copper sulfide ore, which is achieved by double weir non-submerged top-side coordinated injection technology. The specific effects are as follows: (1) The gauge pressure of the central burner 2 is 450 kPa and the gas flow rate is 4500 Nm 3 / h, the center burner 2 is 2000mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 300 kPa, and the gas flow rate is 3000 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 200 kPa, and the air supply flow rate is 1600 Nm 3 / h; (4) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1353.5°C, and the temperature at the slag side wall is 1243°C. The temperature difference between the slag center and the side wall is about 110.5°C. (5) The average Fe3O4 content of the slag is 9.5%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 3.3%. The high-temperature viscosity of the slag is about 0.85 Pa·s.

[0045] Example 4 The Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and gold of the present invention is used to smelt copper sulfide ore, which is achieved by double weir non-submerged top-side coordinated injection technology. The specific effects are as follows: (1) The gauge pressure of the central burner 2 is 450 kPa and the gas flow rate is 4500 Nm 3 / h, the center burner 2 is 3000mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 200 kPa, and the gas flow rate is 2000 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 100 kPa, and the air supply flow rate is 800 Nm 3 / h; (4) Record the temperature at the slag side wall and the temperature at the slag center. The temperature at the slag center is as high as 1342.5°C, and the temperature at the slag side wall is 1209°C. The temperature difference between the slag center and the side wall is about 133.5°C. (5) The average Fe3O4 content of the slag is 12.7%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 4.2%. The high-temperature viscosity of the slag is about 1.19 Pa·s.

[0046] Example 5 The Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and gold of the present invention is used to smelt copper sulfide ore, which is achieved by double weir non-submerged top-side coordinated injection technology. The specific effects are as follows: (1) The gauge pressure of the central burner 2 is 400 kPa and the gas flow rate is 3500 Nm 3 / h, the center burner 2 is 2000mm above the horizontal plane of the molten pool; (2) The gauge pressure of a single side-blowing burner 3 is maintained at 300 kPa, and the gas flow rate is 3000 Nm 3 / h; (3) The side-blowing coal gun 6 and the side-blowing ore gun 5 use normal temperature air. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 200 kPa, and the air supply flow rate is 1600 Nm 3 / h; (4) Record the temperature at the side wall and the center of the slag. The temperature at the center is as high as 1345.5°C, and the temperature at the side wall is 1216°C. The temperature difference between the center and the side wall of the slag is about 129°C. (5) The average Fe3O4 content of the slag is 10.2%. The difference in Fe3O4 concentration between the center and the side wall of the slag is about 3.8%. The high-temperature viscosity of the slag is about 0.95 Pa·s.

Claims

1. A copper smelting method using an Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs, characterized in that: The following steps are involved: (1) After the pulverized coal and raw ore are ground and selected, they are sprayed into the molten pool through the side-blowing coal gun and side-blowing ore gun of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs; (2) The central lance descending from the top of the Ausmelt furnace with double weirs and non-submerged top side coordinated injection of slag and metal provides heat for the furnace body and the molten pool by spraying hot air, and the side-blowing lance of the Ausmelt furnace with double weirs and non-submerged top side coordinated injection of slag and metal serves as a heat supplement; (3) After the reaction is completed, the central lance is raised, the melt temperature distribution is recorded, the slag viscosity is tested, and the slag sample is taken for Fe3O4 content analysis; the molten pool depth is 3000mm~4000mm, the temperature difference between the center and side walls of the slag does not exceed 150℃, the average content of Fe3O4 in the slag is not higher than 15%, the difference in Fe3O4 concentration between the center and side walls does not exceed 7%, and the viscosity of the slag is less than or equal to 1.5Pa·s; The Ausmelt furnace with non-submerged top and side coordinated injection of slag and metal double weirs comprises: a flue, a central lance, a side-blowing lance, a slag port, a side-blowing ore lance, a side-blowing coal lance, and a siphon weir; The furnace is divided into combustion zone, slag layer and molten pool from top to bottom. A flue is arranged on the upper part of the Ausmelt furnace, and a central lance is arranged at the center of the top. The central lance is 2000mm~3000mm above the horizontal plane of the molten pool. The double slag ports and double siphon weir ports are vertically and symmetrically distributed on the furnace body, which is conducive to uniform heat dissipation of the molten pool and avoids mixed flow of slag and gold. The side-blowing ore gun and the side-blowing coal gun have the same specifications and have the function of replacing each other in production.

2. The copper smelting method of the Ausmelt furnace with double weir non-submerged top-side coordinated injection of slag and metal according to claim 1, characterized in that: The Ausmelt furnace with non-submerged top and side coordinated injection of slag and metal double weirs has double slag ports arranged in the middle of the combustion zone and the slag layer, the center line of the slag port is 2500mm~3500mm away from the furnace bottom, the size is a rectangular port of 750mm~950mm square or a circular hole of 650mm~850mm in diameter, and they are symmetrically distributed on the furnace body; the blowing inlet of the side-blowing lance is located in the combustion zone, the opening center line of the side-blowing lance on the furnace body is 5000mm~6000mm away from the furnace bottom, the center line of the muzzle of the side-blowing lance extending into the furnace body is 1500mm~2500mm away from the horizontal plane of the molten pool, and they are symmetrically distributed on the furnace body; the blowing inlet of the side-blowing coal gun is located in the slag layer, and the opening center line of the side-blowing coal gun on the furnace body is 1500mm~2500mm away from the horizontal plane of the molten pool, and they are symmetrically distributed on the furnace body. The side-blowing coal gun muzzle is 2500mm~3500mm away from the furnace bottom, and the center line of the muzzle of the side-blowing coal gun extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and is symmetrically distributed on the furnace body; the blowing inlet of the side-blowing lance is located in the slag layer, and the center line of the opening of the side-blowing lance on the furnace body is 2500mm~3500mm away from the furnace bottom, and the center line of the muzzle of the side-blowing lance extending into the slag layer of the molten pool in the furnace body is 2000mm~2500mm away from the furnace bottom, and is symmetrically distributed on the furnace body; two siphon weirs are set at both ends of the bottom molten pool, the center line of the siphon weir is 500mm~700mm away from the furnace bottom, and the size is a rectangular opening of 750mm~950mm square or a circular hole with a diameter of 650mm~850mm.

3. The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs according to claim 1 is characterized in that: In the step (1), the main components and contents of the raw ore are Cu: 22%~25%, S: 26%~31%, Fe: 25%~30%, SiO2: 5%~7%, CaO: 1.5%~3%; the particle size of the ore powder is 1.25mm~8mm, and the particle size of the coal powder is 0.1mm~6mm.

4. The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs according to claim 1 is characterized in that: In the step (1), the side-blowing coal gun and the side-blowing ore gun use normal temperature air or nitrogen to pressurize and transport the coal powder and the ore powder. The pressure used by a single side-blowing coal gun or side-blowing ore gun is 100kPa~200kPa, and the air supply flow rate is 800Nm 3 / h~1600Nm 3 / h.

5. The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs according to claim 1, characterized in that: In step (2), the heat of the hot air is generated by the combustion of heavy oil or natural gas, the gauge pressure of the central burner is 400kPa~500kPa, and the gas flow rate is 3500Nm 3 / h~4500Nm 3 / h.

6. The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs according to claim 1, characterized in that: In the step (2), the central burner is lowered to 2000 mm to 3000 mm above the horizontal plane of the molten pool during operation.

7. The copper smelting method of the Ausmelt furnace with non-submerged top-side coordinated injection of slag and metal double weirs according to claim 1, characterized in that: In step (2), the gauge pressure of a single side-blowing burner is 200 kPa-300 kPa, and the gas flow rate is 2000 Nm 3 / h~3000Nm 3 / h.

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