CN111020207A - Treatment device and treatment method for copper blowing slag - Google Patents

Treatment device and treatment method for copper blowing slag Download PDF

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CN111020207A
CN111020207A CN202010010802.6A CN202010010802A CN111020207A CN 111020207 A CN111020207 A CN 111020207A CN 202010010802 A CN202010010802 A CN 202010010802A CN 111020207 A CN111020207 A CN 111020207A
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copper
slag
inlet
furnace body
flux
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CN111020207B (en
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李东波
郭亚光
梁帅表
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0028—Smelting or converting
    • C22B15/0052—Reduction smelting or converting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0054—Slag, slime, speiss, or dross treating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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Abstract

The invention provides a treatment device and a treatment method for copper blown slag. The device includes: a copper converting slag supply device for supplying copper converting slag; the CR furnace comprises a furnace body and a heating electrode, wherein the heating electrode penetrates through the wall of the furnace body and extends into an inner cavity of the furnace body, the volume of the heating electrode extending into the inner cavity accounts for 3-10% of the total volume of the inner cavity, the height from the bottom end of the heating electrode to the bottom wall of the inner cavity is 80-120 cm, the furnace body is also provided with a copper converting slag inlet, a reducing agent inlet and a flux inlet, the copper converting slag inlet is connected with a copper converting slag supply device, and the CR furnace is used for recovering valuable metals in the copper converting slag; the reducing agent supply device is connected with the reducing agent inlet and is used for supplying the reducing agent; and the flux supply device is connected with the flux inlet and used for supplying the flux. The device effectively solves the problems that the copper converting slag contains high lead and is not suitable to return to a smelting system, or a P-S converter needs to be vulcanized again during transformation and treatment and lead and zinc metal cannot be recovered.

Description

Treatment device and treatment method for copper blowing slag
Technical Field
The invention relates to the field of metallurgy, in particular to a device and a method for treating copper converting slag.
Background
In the existing pyrometallurgical copper smelting, copper concentrate is usually subjected to copper smelting and matte converting in sequence, the yield of slag in the matte converting process is generally 10-20%, and the slag is called copper converting slag. Different from copper smelting slag, the copper content of the copper blowing slag is generally 10-25%, the lead content is 1-20%, the zinc content is 1-10%, and the copper blowing slag mainly returns to a smelting system at present.
However, in industrial practice, copper converting slag produced by converting is returned to a smelting system, and because the lead content of slag in the copper converting slag is high, cyclic enrichment is caused, so that the lead content in matte and blister copper is high, and troubles are brought to the subsequent copper refining operation. Moreover, when the copper converting slag returns to a smelting system, the copper converting slag needs to be cooled and crushed, and energy waste is also caused.
The patent with application number 201110288211.6 proposes to transform a P-S converter into a reduction converter with fuel injection into the hearth for heat preservation and reductant injection into the molten pool for processing copper converting slag to recover copper resources therein, but this technique requires the addition of a sulfidizing agent to resulfide the metallic copper and fails to comprehensively recover valuable metals such as lead and zinc from the slag.
For the reasons, a new treatment process for copper converting slag is needed to be provided, so as to solve the problems that in the prior art, the copper converting slag contains high lead and is not suitable to return to a smelting system, or a P-S converter needs to be vulcanized again during transformation treatment, and lead and zinc metals cannot be recovered.
Disclosure of Invention
The invention mainly aims to provide a treatment device and a treatment method for copper converting slag, and aims to solve the problems that in the prior art, the copper converting slag contains high lead and is not suitable to return to a smelting system, or a P-S converter needs to be vulcanized again during transformation treatment, and lead and zinc metal cannot be recovered.
In order to achieve the above object, according to one aspect of the present invention, there is provided a processing apparatus of copper blown slag, comprising: a copper converting slag supply device for supplying copper converting slag; the CR furnace comprises a furnace body and a heating electrode, wherein the heating electrode penetrates through the furnace wall of the furnace body and extends into an inner cavity of the furnace body, the volume of the heating electrode extending into the inner cavity accounts for 3-10% of the total volume of the inner cavity, and the height from the bottom end of the heating electrode to the bottom wall of the inner cavity is 80-120 cm; the furnace body is also provided with a copper converting slag inlet, a reducing agent inlet and a flux inlet, and the copper converting slag inlet is connected with a copper converting slag supply device; the CR furnace is used for recovering valuable metals in the copper blowing slag; the reducing agent supply device is connected with the reducing agent inlet and is used for supplying the reducing agent; and the flux supply device is connected with the flux inlet and used for supplying the flux.
Furthermore, the furnace body is a horizontal furnace body, an inner cavity of the furnace body is divided into a first part and a second part which are communicated with each other according to the horizontal direction, the bottoms of the first part and the second part are positioned at the same horizontal height, the top of the first part is higher than that of the second part, and the heating electrode extends into the second part.
Further, the top of the first part is also provided with a dust-containing flue gas outlet, and the copper converting slag inlet is arranged on the side of the first part.
Further, the height of the first part is 1.5-2 times of the height of the second part, and the volume of the second part is 3-6 times of the volume of the first part.
Further, the reductant inlet and the flux inlet are both located at the top of the second portion.
Furthermore, a pyrite inlet is formed in the top of the second portion, and the iron ore inlet, the reducing agent inlet and the flux inlet are located at the same position; the copper converting slag treatment plant also includes an iron ore supply, which is connected to the pyrite inlet.
Further, the processing apparatus of copper blowing slag still includes: the inlet of the waste heat recovery boiler is connected with the dust-containing smoke outlet; and an inlet of the dust collector is connected with an outlet of the waste heat recovery boiler, and the dust collector is used for carrying out dust collection treatment on the smoke discharged by the waste heat recovery boiler so as to obtain lead-zinc-containing smoke.
Further, the furnace body still is provided with metal and puts the export and the tailings is put the export, and the metal is put the export and is set up the lateral part of furnace body and be close to the position of bottom, and the tailings is put the export and is set up the lateral part of furnace body and be higher than the position that the metal was put the export.
According to another aspect of the invention, the invention also provides a method for treating the copper blowing slag, which adopts the device as a treatment device for the copper blowing slag; the processing method comprises the following steps: introducing copper converting slag into an inner cavity of a furnace body through a copper converting slag inlet; and recovering valuable metals in the copper blowing slag under the heat supply state of the heating electrode and the existence of the reducing agent and the flux.
Further, in the step of recovering valuable metals in the copper blowing slag, the temperature in the inner cavity is 1400-1550 ℃, preferably 1460-1550 ℃, and the power density in the inner cavity is 200kW/m2～300kW/m2Preferably 260kW/m2～300kW/m2。
Further, in the step of recovering valuable metals in the copper blowing slag, iron ores are simultaneously put into the inner cavity, and the iron-silicon ratio of slag discharge is controlled to be 1.2-1.6.
Further, in the step of recovering valuable metals in the copper converting slag, the reducing agent accounts for 5-10% of the weight of the copper converting slag, and the flux accounts for 2-5% of the weight of the copper converting slag
Further, the reducing agent is one or more of pulverized coal, natural gas, liquefied petroleum gas and crushed coal, and the fusing agent is one or more of iron ore, pyrite and laterite-nickel ore.
Further, the step of recovering valuable metals in the copper blowing slag generates dust-containing flue gas, and the treatment method further comprises the following steps: and (3) sequentially carrying out preheating recovery and dust collection treatment on the dust-containing smoke to obtain purified smoke and lead-zinc-containing smoke.
According to the treatment device for the copper blowing slag, the adopted CR furnace comprises the furnace body and the heating electrode, the heating electrode penetrates through the furnace wall of the furnace body and extends into the inner cavity of the furnace body, the volume of the heating electrode extending to the inner cavity accounts for 3-10% of the total volume of the inner cavity, and the height from the bottom end of the heating electrode to the bottom wall of the inner cavity is 80-120 cm; the furnace body is also provided with a copper converting slag inlet, a reducing agent inlet and a flux inlet, and the copper converting slag inlet is connected with a copper converting slag supply device. The copper converting slag is introduced into the CR furnace, and the copper can be reduced and slagging can be carried out under the heat supply state of the heating electrode and the action of the reducing agent and the flux. In the process, lead and zinc can be recovered along with the exhaust of flue gas. And the volume that heating electrode extended to the inner chamber accounts for 3 ~ 10% of inner chamber total volume, and the height of heating electrode's bottom apart from the inner chamber diapire is 80 ~ 120cm, and such setting up has higher energy density in making the inner chamber, and it is more thorough to the reduction of copper in the copper blown slag, and the sediment is more thorough with the layering of metallization copper matte.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view showing a copper-blown slag treatment apparatus according to an embodiment of the present invention; and
fig. 2 is a schematic view showing the structure of a CR furnace in a copper blown slag treatment apparatus according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a CR furnace; 11. a furnace body; 12. heating the electrode; 20. a reducing agent supply device; 30. a flux supply device; 40. an iron ore supply device; 50. a waste heat recovery boiler; 60. provided is a dust collector.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As described in the background section, the copper converting slag in the prior art has high lead content and is not suitable to be returned to a smelting system, or the P-S converter needs to be re-vulcanized during modification treatment and lead and zinc metals cannot be recovered.
In order to solve the above problems, the present invention provides a processing apparatus of copper-blown slag, as shown in fig. 1 and 2, comprising: a copper converting slag supply device for supplying copper converting slag A; the CR furnace 10 comprises a furnace body 11 and a heating electrode 12, wherein the heating electrode 12 penetrates through the furnace wall of the furnace body 11 and extends into the inner cavity of the furnace body 11, the volume of the heating electrode 12 extending into the inner cavity accounts for 3-10% of the total volume of the inner cavity, and the height from the bottom end of the heating electrode 12 to the bottom wall of the inner cavity is 80-120 cm; the furnace body 11 is also provided with a copper converting slag inlet, a reducing agent inlet and a flux inlet, and the copper converting slag inlet is connected with a copper converting slag supply device; the CR furnace 10 is used for recovering valuable metals in the copper blowing slag; a reducing agent supply device 20 connected to the reducing agent inlet for supplying a reducing agent B; a flux supply device 30 connected to the flux inlet for supplying the flux C.
The copper converting slag is introduced into the CR furnace, and the copper can be reduced and slagging can be carried out under the heat supply state of the heating electrode and the action of the reducing agent and the flux. In the process, lead and zinc can be recovered along with the exhaust of flue gas. Therefore, the valuable metals in the copper blowing slag can be comprehensively recovered by using the device without re-sulfurization. And the volume that heating electrode extended to the inner chamber accounts for 3 ~ 10% of inner chamber total volume, and the height of heating electrode's bottom apart from the inner chamber diapire is 80 ~ 120cm, and such setting up has higher energy density in making the inner chamber, and it is more thorough to the reduction of copper in the copper blown slag, and the sediment is more thorough with the metallized copper layering.
Meanwhile, the invention can directly treat the liquid copper converting slag, fully utilize the heat resource of the liquid copper converting slag, save energy and reduce energy consumption. Besides, the copper converting slag treatment device has obvious advantages in the aspects of saving energy, ensuring the production efficiency, reducing the investment and the production cost and reducing the occupied area, and is very suitable for industrial large-scale application.
In a preferred embodiment, the furnace body 11 is a horizontal furnace body, the inner cavity of the furnace body 11 is divided into a first part and a second part which are communicated with each other according to the horizontal direction, the bottoms of the first part and the second part are positioned at the same horizontal height, the top of the first part is higher than the top of the second part, and the heating electrode 12 extends to the inside of the second part. Therefore, the flue gas generated in the reaction process of the copper blowing slag, the reducing agent and the flux can be gathered at the top of the inner cavity of the first part, and the flue gas is more conveniently discharged under the condition of reducing heat energy loss as much as possible. And the heating electrode 12 is extended into the second part, so that the heating electrode can be arranged closer to a slag layer of the copper converting slag, the energy is more concentrated, and the copper converting slag is fully reduced. More preferably, the top of the first section is also provided with a dust-laden flue gas outlet (for discharging dust-laden flue gas G), and the copper converting slag inlet is provided at the side of the first section. Therefore, the copper converting slag can enter from the side part of the first part in the process of continuously treating the copper converting slag, and the thermal stability of the slag layer in the second part can be maintained.
In order to discharge the flue gas more smoothly and make the thermal environment of the slag layer more stable, preferably, the height of the first part is 1.5-2 times of the height of the second part, and the volume of the second part is 3-6 times of the volume of the first part. More preferably, the reductant inlet and the flux inlet are both located at the top of the second portion. And in order to facilitate feeding and reduce heat dissipation, the reducing agent inlet and the flux inlet are preferably the same inlet.
As mentioned above, the device of the invention is used for treating the copper blowing slag without connecting a vulcanizing agent for re-vulcanization. In order to improve the slag tapping effect, in a preferred embodiment, the top of the second part is also provided with an iron ore inlet, and the iron ore inlet, the reducing agent inlet and the flux inlet are in the same position; as shown in fig. 1, the processing apparatus of copper-blown slag further includes an iron ore supply apparatus 40 connected to the iron ore inlet for supplying iron ore D.
In a preferred embodiment, the apparatus for treating copper converting slag further includes: the waste heat recovery boiler 50 is connected with the inlet of the waste heat recovery boiler 50 and the dust-containing smoke outlet; and an inlet of the dust collector 60 is connected with an outlet of the waste heat recovery boiler 50, and the dust collector 60 is used for collecting dust from the flue gas discharged by the waste heat recovery boiler 50 to obtain lead-zinc-containing smoke. Therefore, the waste heat recovery and dust collection treatment can be carried out on the high-temperature dust-containing smoke at one time, and the valuable metals of lead and zinc can be more fully recovered after dust collection.
More preferably, the furnace body 11 is further provided with a metal taphole (for tapping the matte E) and a tailings taphole (for tapping the tailings F), the metal taphole is arranged at a position on the side of the furnace body 11 near the bottom, and the tailings taphole is arranged at a position on the side of the furnace body 11 and higher than the metal taphole.
According to another aspect of the invention, the invention also provides a method for treating the copper converting slag, which adopts a device which is the device for treating the copper converting slag; the processing method comprises the following steps: introducing copper converting slag into an inner cavity of the furnace body 11 through a copper converting slag inlet; valuable metals in the copper blown slag are recovered in a state of supplying heat to the heating electrode 12 and in the presence of a reducing agent and a flux. By adopting the method, valuable metals in the copper blowing slag can be comprehensively recovered without re-sulfurization.
By using the method provided by the invention to treat the copper converting slag, the copper content in the tailings can be reduced to be below 0.38%, the lead and zinc content can be reduced to be below 0.3%, the lead and zinc volatilization rate exceeds 92%, the copper recovery rate reaches above 96%, and 30-90% copper grade matte is produced. In the copper reduction process, valuable metal elements such as gold, silver and the like can enter the matte to be enriched, the recovery rate can reach more than 90%, and the valuable metal elements can also be collected by returning to the copper smelting process.
In order to more fully reduce and recover the copper in the copper converting slag, in a preferred embodiment, in the step of recovering the valuable metals in the copper converting slag, the temperature in the inner cavity is 1400-1550 ℃, preferably 1460-1550 ℃, and the power density in the inner cavity is 260kW/m2～300kW/m2Preferably 260kW/m2～300kW/m2；
In a preferred embodiment, in the step of recovering valuable metals in the copper blowing slag, iron ore is simultaneously put into the inner cavity, and the iron-silicon ratio of slag discharge is controlled to be 1.0-1.6. Thus being beneficial to improving the slag discharging effect. More preferably, in order to further improve the recovery rate of valuable metals, in the step of recovering valuable metals from the copper converting slag, the reducing agent accounts for 5-10% of the weight of the copper converting slag, and the flux accounts for 2-5% of the weight of the copper converting slag
The reducing agent and the flux can be selected from the types commonly used in the metallurgical field, for example, the reducing agent comprises but is not limited to one or more of pulverized coal, natural gas, liquefied petroleum gas and crushed coal, and the flux comprises but is not limited to one or more of iron ore, pyrite and laterite nickel ore.
In a preferred embodiment, the step of recovering valuable metals from copper-blown slag generates dust-containing flue gas, lead and zinc are recovered from volatile dust, the lead content in the flue gas is more than 40%, and the zinc content in the flue gas is more than 15%, and the treatment method further comprises the following steps: and (3) sequentially carrying out preheating recovery and dust collection treatment on the dust-containing smoke to obtain purified smoke and lead-zinc-containing smoke.
In the actual operation process, the copper blowing slag can be transferred into the CR furnace for reaction through a chute or a slag ladle. The recovered matte discharge outlet can be returned to the copper smelting system after being crushed by water. The slag is discharged from a slag outlet of the CR furnace and is common solid waste.
In practice, it is preferred to inject a reducing gas or an oxygen-containing gas or an inert gas, such as one or more of oxygen, air, oxygen-enriched air, natural gas, liquefied petroleum gas, nitrogen and pulverized coal, into the inner cavity through the top or side of the furnace body 11 by means of lances to stir the melt, enhance the mixing and processing rate of the fumes and slag, and to discharge the flue gases. Of course, if the reducing gas, the pulverized coal, or both of these gases are injected, they can participate in the reaction at the same time. The "oxygen-enriched air" herein refers to a gas having an oxygen concentration greater than that of air, and can be obtained, for example, by incorporating oxygen into air.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
The comprehensive recovery of the copper converting slag is carried out by utilizing the CR furnace device and the processing device shown in figures 1 and 2, wherein the volume of the heating electrode extending to the inner cavity accounts for 7 percent of the total volume of the inner cavity; the bottom end of the heating electrode is 100cm away from the bottom wall of the inner cavity.
The device has the following process conditions:
liquid copper blown slag flows into a CR furnace from a converting furnace through a chute, 5 percent of iron ore and 5 percent of crushed coal (the granularity is 5 mm-30 mm) of the total weight of the blown slag are added, the temperature of slag in the furnace is raised to 1450 ℃, and the energy density is 300kW/m2And the ratio of the iron to the silicon discharged is 1.3, the obtained metal is returned to the smelting furnace, and the obtained lead-zinc-containing smoke dust is sold.
And (3) processing results: 10 ten thousand tons of copper converting slag are treated annually, and the converting slag contains 19.43 percent of copper, 4.77 percent of zinc and 13.52 percent of lead; after the blowing slag is treated by the CR furnace, the slag contains 0.32 percent of copper, 0.15 percent of zinc and 0.23 percent of lead. The copper recovery rate of the whole system is about 98.5 percent, the lead and zinc recovery rates are all over 95 percent, and the copper content of the obtained matte is 75 percent.
Example 2
The processing apparatus and method are the same as example 1 except that:
adding reducing agent pulverized coal, wherein the adding amount of the reducing agent pulverized coal is 4% of the total weight of the converting slag; adding 3% iron ore concentrate; the temperature in the furnace is 1480 ℃, and the energy density is 260kW/m2The ratio of the iron to the silicon discharged is 1.6; the obtained metal is returned to the smelting furnace, and the obtained lead-zinc-containing smoke dust is sold.
And (3) processing results: the annual treatment of the blowing slag is 11 ten thousand tons, the copper content of the blowing slag is 21.52 percent, the zinc content of the blowing slag is 3.03 percent, and the lead content is 9.56 percent; after the treatment of the blowing slag, the copper content of the slag is 0.4 percent, the zinc content of the slag is 0.08 percent, and the lead content of the slag is 0.12 percent. The copper recovery rate of the whole system is about 98.5 percent, the lead and zinc recovery rates exceed 96 percent, and the obtained copper matte contains 85 percent of copper.
Example 3
The processing apparatus and method are the same as example 1 except that:
adding reducing agent pulverized coal, wherein the adding amount of the reducing agent pulverized coal is 5% of the total weight of the smelting slag; adding 4% iron ore concentrate; the temperature of the slag in the furnace is raised to 1460 ℃, and the energy density is 280kW/m2The ratio of the iron to the silicon discharged is 1.25; returning the obtained metal to the converting furnace, and selling the obtained lead-zinc-containing smoke dust. In order to enhance the mixing and reaction speed of the reducing agent and the slag, 4 small spray guns are arranged at the upper part of the CR furnace body, and reducing gas natural gas is sprayed in.
And (3) processing results: 10 ten thousand tons of blowing slag are treated per year, and the blowing slag contains 15.36 percent of copper, 2.05 percent of zinc and 11.46 percent of lead; the slag after the smelting slag is further treated contains 0.35% of copper, 0.11% of zinc and 0.16% of lead. The copper recovery rate of the whole system is about 98.5%, the lead and zinc recovery rates are all over 93%, and the obtained copper matte contains 88% of copper.
Example 4
The processing apparatus and method are the same as those in embodiment 3 except that:
adding reducing agent lump coal, wherein the adding amount of the reducing agent lump coal is 10 percent of the total weight of the converting slag; the adding amount of the quartz sand is 4 percent of the total weight of the converting slag; the temperature of the slag in the furnace is raised to 1400 ℃, and the energy density is 273kW/m2The tapping iron-silicon ratio is 1.32.
And (3) processing results: 15 ten thousand tons of blowing slag are treated annually, the blowing slag contains 16.58 percent of copper, 2.71 percent of zinc and 7.65 percent of lead; after the treatment of the blowing slag, the slag contains 0.30% of copper, 0.12% of zinc and 0.19% of lead, and the obtained matte contains 54% of copper.
Example 5
The processing apparatus and method are the same as example 1 except that:
the volume of the heating electrode extending to the inner cavity accounts for 6 percent of the total volume of the inner cavity; the bottom end of the heating electrode is 110cm away from the bottom wall of the inner cavity.
The temperature of the inner cavity in the treatment process is 1500 ℃, and the energy density is 295kW/m2。
And (3) processing results: 6 ten thousand tons of blowing slag are treated per year, and the blowing slag contains 18.30 percent of copper, 3.12 percent of zinc and 12.35 percent of lead; after the treatment of the blowing slag, the slag contains 0.32% of copper, 0.10% of zinc and 0.08% of lead, and the obtained matte contains 67.2% of copper.
Example 6
The processing apparatus and method are the same as example 1 except that:
the volume of the heating electrode extending to the inner cavity accounts for 3% of the total volume of the inner cavity; the bottom end of the heating electrode is 120cm away from the bottom wall of the inner cavity.
The temperature of the inner cavity in the treatment process is 1450 ℃, and the energy density is 260kW/m2。
And (3) processing results: 7 ten thousand tons of annual processed blowing slag contains 16.42 percent of copper, 3.49 percent of zinc and 11.31 percent of lead; after the treatment of the blowing slag, the slag contains 0.33% of copper, 0.25% of zinc and 0.27% of lead, and the obtained matte contains 60.2% of copper.
Example 7
The processing apparatus and method are the same as example 1 except that:
the volume of the heating electrode extending to the inner cavity accounts for 5% of the total volume of the inner cavity; the bottom end of the heating electrode is 80cm away from the bottom wall of the inner cavity.
The temperature of the inner cavity in the treatment process is 1490 ℃, and the energy density is 300kW/m2。
And (3) processing results: the annual treatment of the blowing slag is 11 ten thousand tons, the copper content of the blowing slag is 20.22 percent, the zinc content of the blowing slag is 3.42 percent, and the lead content is 9.27 percent; after the treatment of the blowing slag, the copper content of the slag is 0.34 percent, the zinc content of the slag is 0.11 percent, and the lead content of the slag is 0.14 percent. The copper recovery rate of the whole system is about 98.9 percent, the lead and zinc recovery rates exceed 96 percent, and the obtained copper matte contains 86 percent of copper.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A treatment device for copper converting slag is characterized by comprising:
a copper converting slag supply device for supplying the copper converting slag;
the CR furnace (10) comprises a furnace body (11) and a heating electrode (12), wherein the heating electrode (12) penetrates through the furnace wall of the furnace body (11) and extends into an inner cavity of the furnace body (11), the volume of the heating electrode (12) extending into the inner cavity accounts for 3-10% of the total volume of the inner cavity, and the height from the bottom end of the heating electrode (12) to the bottom wall of the inner cavity is 80-120 cm; the furnace body (11) is also provided with a copper converting slag inlet, a reducing agent inlet and a flux inlet, and the copper converting slag inlet is connected with the copper converting slag supply device; the CR furnace (10) is used for recovering valuable metals in the copper blowing slag;
a reductant supply device (20) connected to the reductant inlet for supplying reductant;
a flux supply device (30) connected to the flux inlet for supplying flux.
2. The apparatus according to claim 1, wherein the furnace body (11) is a horizontal furnace body, the inner cavity of the furnace body (11) is divided into a first part and a second part which are communicated with each other in a horizontal direction, the bottoms of the first part and the second part are positioned at the same horizontal height, the top of the first part is higher than the top of the second part, and the heating electrode (12) extends into the second part.
3. The apparatus of claim 2, wherein the top of the first section is further provided with a dust laden flue gas outlet and the copper converting slag inlet is provided at a side of the first section.
4. The device of claim 2, wherein the height of the first section is 1.5-2 times the height of the second section, and the volume of the second section is 3-6 times the volume of the first section.
5. An apparatus according to any one of claims 2 to 4, wherein the reductant inlet and the flux inlet are both located at the top of the second portion.
6. The apparatus according to claim 5, characterized in that the top of the second section is also provided with an inlet for pyrite, and the inlet for iron ore, the inlet for reducing agent and the inlet for flux are in the same position; the copper converting slag processing apparatus further includes an iron ore supply apparatus (40) connected to the pyrite inlet.
7. The apparatus according to claim 3, wherein the treatment apparatus for copper converting slag further comprises:
the inlet of the waste heat recovery boiler (50) is connected with the dust-containing smoke outlet;
the dust collector (60), the import of dust collector (60) with the export of waste heat recovery boiler (50) links to each other, dust collector (60) are used for to waste heat recovery boiler (50) exhaust flue gas carries out dust collection treatment in order to obtain lead-zinc containing smoke and dust.
8. The apparatus according to any one of claims 1 to 4, wherein the furnace body (11) is further provided with a metal taphole provided at a position on the side of the furnace body (11) near the bottom and a tailings taphole provided at a position on the side of the furnace body (11) higher than the metal taphole.
9. A method for treating copper blown slag, characterized in that the device adopted in the method is the device for treating copper blown slag according to any one of claims 1 to 8;
the processing method comprises the following steps:
introducing the copper converting slag into an inner cavity of a furnace body (11) through the copper converting slag inlet;
and recovering valuable metals in the copper blowing slag under the heat supply state of the heating electrode (12) and the existence of a reducing agent and a flux.
10. The process according to claim 9, wherein in the step of recovering the valuable metals from the copper-blown slag, the temperature in the inner chamber is 1400 to 1550 ℃ and the power density in the inner chamber is 200kW/m2～300kW/m2。
11. The process according to claim 9, wherein in the step of recovering valuable metals from the copper blown slag, iron ore is simultaneously charged into the inner cavity, and the iron-to-silicon ratio of the discharged slag is controlled to 1 to 1.6.
12. The process according to any one of claims 9 to 11, wherein in the step of recovering valuable metals from the copper-blown slag, the reducing agent is 5 to 10% by weight of the copper-blown slag, and the flux is 2 to 5% by weight of the copper-blown slag.
13. The process of claim 12, wherein the reducing agent is one or more of pulverized coal, natural gas, liquefied petroleum gas and crushed coal, and the flux is one or more of iron ore, pyrite and laterite-nickel ore.
14. The process according to any one of claims 9 to 11, wherein the step of recovering the valuable metals from the copper blown slag produces a dusty flue gas, the process further comprising:
and (3) sequentially carrying out preheating recovery and dust collection treatment on the dust-containing flue gas to obtain purified flue gas and lead-zinc-containing flue dust.
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