A copper slag modification and granulation system with real-time adjustable atmosphere and composition.
By integrating gas interfaces and feed ports into the adjustable fume hood of the copper smelting furnace, the oxidation-reduction state and composition of the molten slag can be controlled in real time, solving the problems of long slow cooling cycles and excessively large copper phase grains in traditional copper smelting, and improving the flotation recovery rate and granulation effect of copper slag.
Patent Information
- Application Number
- CN202610336860.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-19
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional copper smelting processes involve long slow cooling cycles, large footprints, and high energy consumption. Furthermore, the granulation of slag at high temperatures leads to excessively large copper phase grains, affecting flotation recovery rates, and the physical properties of the slag are difficult to actively optimize.
By integrating multiple gas interfaces and feeding ports into the adjustable fume hood of the smelting furnace, the oxidation-reduction state and chemical composition of the slag can be controlled in real time. Combined with the addition of modifiers, the physical properties of the slag can be optimized, creating conditions for subsequent granulation processes.
This method achieves a controllable oxidation-reduction state of slag during the heat preservation stage, promotes copper particle growth, improves flotation recovery rate, optimizes slag viscosity and surface tension, enhances centrifugal granulation effect, and provides an efficient resource recovery method.
Smart Images
Figure CN122081670A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-temperature slag treatment and waste heat recovery technology in copper smelting, and in particular to a copper slag modification and granulation system with adjustable atmosphere and composition in real time. Background Technology
[0002] In copper smelting, the traditional "slow cooling + water quenching" process is widely used, but it still has limitations such as long slow cooling cycles, large footprint, high energy consumption, and passive process control, making it difficult to actively optimize the properties of slag. As a promising alternative, dry centrifugal granulation technology aims to efficiently crush slag and simultaneously recover waste heat, and is considered an ideal path to achieve slag resource utilization and heat recovery.
[0003] However, in practice, to maintain the fluidity of the slag before granulation and reduce heat loss during transport, the slag is usually kept at a relatively high temperature (>1300℃) for direct granulation. This prevents it from undergoing the critical slow cooling stage above 1000℃. Slow cooling within this temperature range is crucial for copper particle growth—the slower the cooling rate, the larger the copper phase grain size, and the higher the subsequent flotation recovery rate. Furthermore, key physical properties of the slag, such as viscosity and surface tension, directly affect the centrifugal granulation effect and slag particle quality.
[0004] Therefore, there is an urgent need to develop a device that can integrate atmosphere control and composition modification functions during the slow cooling stage, thereby actively optimizing the copper phase aggregation behavior and adjusting the slag properties, creating favorable conditions for subsequent efficient granulation and resource recovery. Summary of the Invention
[0005] The purpose of this invention is to address the above-mentioned issues by providing a copper slag modification and granulation system with real-time adjustable atmosphere and composition. This system integrates multiple gas interfaces and feeding ports on the adjustable fume hood of the smelting furnace to achieve active control over the oxidation-reduction state and chemical composition of the slag during the heat preservation stage, thereby optimizing the slag properties and creating conditions for subsequent granulation processes.
[0006] The specific solution of the present invention is: a copper slag modification and granulation system with adjustable atmosphere and composition in real time, comprising: a smelting furnace for heat preservation and modification treatment of copper slag, the top of which is equipped with an adjustable fume hood for modifying the slag in the smelting furnace; a heat preservation chute connected to the slag outlet of the smelting furnace for conveying the modified slag to the granulation section; a granulation device connected to the outlet of the heat preservation chute for dry centrifugal granulation of the modified slag; the adjustable fume hood is provided with: an oxidizing gas interface for introducing oxidizing gas into the furnace; a reducing gas interface for introducing reducing gas into the furnace; a backup gas interface for introducing oxidizing or reducing gas; an openable / closable observation / feeding port for observing the state inside the furnace and / or adding modified materials into the furnace; and a flue gas outlet for discharging the flue gas generated inside the furnace; the smelting furnace includes a furnace body, an induction coil, a crucible, a reducer, and refractory materials.
[0007] Furthermore, each gas interface on the adjustable fume hood described in this invention is equipped with a gas flow control valve, which is used to independently adjust the gas flow of each gas interface according to the set process parameters; the adjustable fume hood is equipped with an atmosphere monitoring sensor, which is used to monitor the oxygen partial pressure or the concentration of key gas components in the furnace atmosphere in real time; the gas flow control valve and the atmosphere monitoring sensor are connected to the control system to form a closed-loop regulation, and the gas flow is adjusted in real time according to the monitoring results to maintain the required oxidizing or reducing atmosphere in the furnace.
[0008] Furthermore, the process of slag modification treatment for the adjustable fume hood described in this invention includes:
[0009] Atmosphere control stage: Based on the target slag phase composition, select and introduce the corresponding atmosphere gas into the melting furnace through the oxidation gas interface or the reduction gas interface to control the oxygen potential in the furnace and promote the growth of copper phase particles in the slag.
[0010] Composition control stage: During the heat preservation and slow cooling process, one or more modifiers of SiO2, CaO, and Al2O3 are added into the smelting furnace through the observation / feeding port according to the slag fluidity and subsequent granulation requirements to adjust the viscosity and surface tension of the slag and optimize its centrifugal granulation performance.
[0011] Synergistic regulation stage: Based on atmosphere regulation and composition regulation, the copper phase aggregation behavior and slag physical properties are simultaneously optimized by adjusting the atmosphere in the smelting furnace and the timing of modifier addition.
[0012] Furthermore, the speed reducer described in this invention is used to control the tilting operation of the smelting furnace to achieve directional discharge of molten slag.
[0013] The beneficial effects of the technical solution provided by this invention include at least the following:
[0014] 1. The implementation of the present invention enables the adjustment of the oxidation-reduction state of the slag during the heat preservation stage, which promotes the growth of copper particles and improves the flotation recovery rate.
[0015] 2. In this invention, the composition of the molten slag is adjusted by adding a modifier to optimize its viscosity and surface tension, thereby improving the subsequent centrifugal granulation effect;
[0016] 3. The adjustable fume hood in this invention integrates multiple interface structures, which can realize flexible and precise control of atmosphere and composition, and adapt to different slag properties and process requirements.
[0017] 4. The system device of the present invention has a compact structure and is easy to control, providing an efficient and controllable pretreatment method for copper slag resource utilization and waste heat recovery. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure and connections of the present invention;
[0019] Figure 2 This is a schematic diagram of the smelting furnace and adjustable fume hood in the main view of the present invention;
[0020] Figure 3 This is a top view structural diagram of the adjustable smoke hood in this invention.
[0021] In the picture:
[0022] 1. Smelting furnace; 101. Furnace body; 102. Induction coil; 103. Crucible; 104. Reducer; 105. Refractory material;
[0023] 2. Adjustable fume hood; 201. Oxidizing gas interface; 202. Reducing gas interface; 203. Backup gas interface; 204. Observation / feeding port; 205. Flue gas outlet;
[0024] 3. Insulated chute;
[0025] 4. Granulation device, 401. High-temperature slag transition device, 402. Granulation disc, 403. Slag outlet. Detailed Implementation
[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0028] This invention relates to a copper slag modification and granulation system with real-time adjustable atmosphere and composition, comprising: a smelting furnace 1 for heat preservation and modification treatment of copper slag, with an adjustable fume hood 2 on its top for modifying the slag inside the smelting furnace; a heat-insulating chute 3 connected to the slag outlet 403 of the smelting furnace for conveying the modified slag to the granulation section; and a granulation device 4 connected to the outlet of the heat-insulating chute for dry centrifugal granulation of the modified slag; the adjustable fume hood is provided with an oxidizing gas interface 201 for introducing oxidizing gas into the furnace. The furnace includes an oxidizing gas inlet 202 for introducing reducing gas into the furnace, a backup gas inlet 203 for introducing either oxidizing or reducing gas, an openable / closable observation / feeding port 204 for observing the furnace status and / or adding modified materials, and a flue gas outlet 205 for discharging the flue gas generated in the furnace. The furnace comprises a furnace body 101, an induction coil 102, a crucible 103, a reducer 104, and refractory material 105. Furthermore, the reducer in this invention is used to control the tilting operation of the furnace, enabling directional discharge of molten slag.
[0029] Furthermore, each gas interface on the adjustable fume hood described in this invention is equipped with a gas flow control valve, which is used to independently adjust the gas flow of each gas interface according to the set process parameters; the adjustable fume hood is equipped with an atmosphere monitoring sensor, which is used to monitor the oxygen partial pressure or the concentration of key gas components in the furnace atmosphere in real time; the gas flow control valve and the atmosphere monitoring sensor are connected to the control system to form a closed-loop regulation, and the gas flow is adjusted in real time according to the monitoring results to maintain the required oxidizing or reducing atmosphere in the furnace.
[0030] Furthermore, the process of slag modification treatment for the adjustable fume hood described in this invention includes:
[0031] Atmosphere control stage: Based on the target slag phase composition, select and introduce the corresponding atmosphere gas into the melting furnace through the oxidation gas interface or the reduction gas interface to control the oxygen potential in the furnace and promote the growth of copper phase particles in the slag.
[0032] Composition control stage: During the heat preservation and slow cooling process, one or more modifiers of SiO2, CaO, and Al2O3 are added into the smelting furnace through the observation / feeding port according to the slag fluidity and subsequent granulation requirements to adjust the viscosity and surface tension of the slag and optimize its centrifugal granulation performance.
[0033] Synergistic regulation stage: Based on atmosphere regulation and composition regulation, the copper phase aggregation behavior and slag physical properties are simultaneously optimized by adjusting the atmosphere in the smelting furnace and the timing of modifier addition.
[0034] Reference Figures 1-3 The device system of this invention mainly includes a smelting furnace 1, an insulated chute 3, and a granulation device 4. The smelting furnace 1 is an induction heating type, including a furnace body 101, an induction coil 102, a crucible 103, a reducer 104, and refractory material 105, used to hold and heat copper slag. An adjustable fume hood 2 is provided on the top of the furnace, with an oxidizing gas interface 201, a reducing gas interface 202, a backup gas interface 203, an observation / feeding port 204, and a flue gas outlet 205. Through interfaces 201 to 203, gases such as air, nitrogen, and carbon monoxide can be introduced into the smelting furnace to adjust the oxygen partial pressure inside the furnace; through the observation / feeding port 204, modifiers such as SiO2, CaO, Al2O3, and carbon powder can be added to adjust the composition and viscosity of the slag.
[0035] In the process, molten copper slag is first injected into the smelting furnace 1. Depending on the slag properties and process objectives, oxidizing or reducing gases are introduced, and modifiers can be added in real time. During the slow cooling and heat preservation process, the atmosphere and composition are adjusted to promote copper phase aggregation and growth, and optimize slag fluidity. After slow cooling and heat preservation promote copper phase aggregation and modification to ensure good slag fluidity, the adjustable fume hood 2 is raised. The furnace is tilted by adjusting the reducer 104, and the slag is poured into the granulation device 4 via the heat preservation chute 3 for centrifugal granulation. The granulated slag particles can be directly used for subsequent flotation or waste heat recovery.
[0036] This invention is not only applicable to copper smelting slag, but can also be extended to the modification and treatment of other metallurgical slags, and has good prospects for industrial application.
Claims
1. A copper slag modification granulation system with real-time adjustable atmosphere and composition, characterized in that, The application relates to a smelting furnace for heat preservation and modification treatment of copper slag, which is provided with an adjustable smoke hood at the top, and the smelting furnace is used for modification treatment of molten slag in the smelting furnace through the adjustable smoke hood. A heat preservation channel is connected with a slag outlet of the smelting furnace, and is used for conveying the modified molten slag to a granulation section. A granulation device is connected with an outlet of the heat preservation channel, and is used for dry centrifugal granulation of the modified molten slag. The adjustable smoke hood is provided with an oxidizing gas interface for introducing oxidizing gas into the furnace, a reducing gas interface for introducing reducing gas into the furnace, a standby gas interface for introducing oxidizing or reducing gas, an openable and closable observation / feeding opening for observing the state in the furnace and / or adding modification materials into the furnace, and a smoke gas outlet for discharging smoke gas generated in the furnace. The smelting furnace comprises a furnace body, an induction coil, a crucible, a speed reducer and refractory materials. The adjustable smoke hood is provided with a gas flow control valve at each gas interface, which is used for independently adjusting the gas flow of each gas interface according to the set process parameters; the adjustable smoke hood is provided with an atmosphere monitoring sensor, which is used for real-time monitoring of the oxygen partial pressure or the concentration of key gas components in the furnace atmosphere; the gas flow control valve and the atmosphere monitoring sensor are connected with a control system to form a closed loop regulation, and the gas flow is adjusted in real time according to the monitoring results to maintain the required oxidizing or reducing atmosphere in the furnace. The process of smelting slag modification treatment of the adjustable smoke hood comprises the following steps:
2. The copper slag modification granulation system with real-time adjustable atmosphere and composition according to claim 1, characterized in that, An atmosphere regulation stage: according to the target slag phase composition, corresponding atmosphere gas is selected and introduced into the smelting furnace through the oxidizing gas interface or the reducing gas interface, the oxygen potential in the furnace is regulated, and the growth of copper phase particles in the molten slag is promoted; 3. The copper slag modification granulation system with real-time adjustable atmosphere and composition according to claim 1, characterized in that, A component regulation stage: during the heat preservation and slow cooling process, one or more modifiers of SiO2, CaO and Al2O3 are added into the smelting furnace through the observation / feeding opening according to the flowability of the molten slag and the subsequent granulation requirement, the viscosity and surface tension of the molten slag are adjusted, and the centrifugal granulation performance is optimized; A synergistic regulation stage: on the basis of atmosphere regulation and component regulation, the atmosphere in the smelting furnace and the timing of adding the modifier are adjusted to realize the synchronous optimization of the copper phase aggregation behavior and the physical properties of the molten slag. The speed reducer is used for controlling the dumping operation of the smelting furnace to realize directional discharge of the molten slag. 4. The copper slag modification granulation system with real-time adjustable atmosphere and composition according to claim 1, characterized in that,