RU2741038C1 - Method and device for melting copper with complex processing of slag - Google Patents

Abstract

FIELD: metallurgy.SUBSTANCE: group of inventions relates to pyrometallurgy, particularly to copper smelting with complex processing of slag. Proposed method comprises full-cycle (FC) furnace. FC furnace (30) includes a cavity in which the reducing evaporation chamber (31) and precipitation chamber (32) are interconnected. Step of extraction of valuable metals contained in melting slag involves reduction evaporation treatment of melting slag in reducing evaporating chamber (31) to obtain aerosol of precious metals and reduced slag, and settling treatment of reclaimed slag in precipitation chamber (32) to obtain copper matte and depleted slag. In another embodiment - settling treatment of melting slag in precipitation chamber (32) to obtain copper matte and precipitated slag and reducing evaporation treatment of precipitated slag in reducing evaporating chamber (31) to obtain an aerosol of valuable metals and lean slag.EFFECT: invention enables to efficiently extract precious metals and considerably simplifies the method of copper melting.13 cl, 5 dwg

Description

Technical Field of the Present Invention

The present invention relates to the field of copper smelting and, in particular, to a method and apparatus for copper smelting with integrated slag processing.

Background of the present invention

Currently, copper smelting slag is processed through a slow slag beneficiation process involving cooling, crushing, grinding, compacting and flotation, the resulting slag concentrate is returned to the smelter, and the slag waste is discarded or sold as building materials. This process is time consuming and requires a large area. More importantly, the valuable metals contained in the slag, such as zinc, lead and antimony, go to the slag waste and are not recycled, resulting in a huge loss of valuable resources. Ore beneficiation agents added during the slag beneficiation process, as well as a variety of heavy metals present in the slag, can also cause potential environmental pollution.

Summary of the present invention

The main objective of the present invention is to provide a method and apparatus for copper smelting with integrated slag processing in such a way as to solve the problems of traditional technology that complicate the process of processing slag from copper smelting, hinder the efficient recovery of heavy metals and create significant environmental pollution.

To achieve the aforementioned object, according to an aspect of the present invention, there is provided a method for smelting copper with integrated slag processing, in which a complete conversion furnace (TP) can be used to carry out reductive evaporation and deposition of the melt slag with complex recovery of valuable metals contained in the melt slag and obtaining harmless slag. The precious metals can be one or more of lead, zinc, and antimony. The PP furnace may include a cavity, the cavity containing a reduction evaporation chamber and a settling chamber in communication with each other. The step of recovering valuable metals contained in the smelting slag may include performing a reductive evaporation treatment of the smelting slag in a reducing evaporation chamber to obtain an aerosol of valuable metals and reduced slag, and performing precipitation treatment of the reduced slag in a settling chamber to obtain copper matte and harmless slag; or performing a precipitation treatment of the smelter slag in a precipitation chamber to obtain copper matte and precipitated slag, and performing a reduction evaporation treatment of the precipitated slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and a harmless slag.

In addition, the dividing wall can be additionally located in the cavity for dividing the cavity into a reducing evaporation chamber and a settling chamber, wherein the reducing evaporation chamber and the settling chamber can be respectively located on two sides of the dividing wall in the horizontal direction, and the connecting channel of the reducing evaporation chamber chamber and settling chamber can be located near the bottom of the cavity.

In addition, the reduction evaporation treatment step may include adding a reducing agent to a reduction evaporation chamber for the reduction evaporation treatment, the reducing agent being preferably selected from one or more of natural gas, coal gas, liquefied petroleum gas, powdered iron, and a solid carbon-based reducing agent. and the solid carbon-based reducing agent is more preferably selected from one or more lump coal, powdered coal, and coke materials.

In addition, a side-blown atomizer may be disposed in the reduction evaporation chamber, and in the reduction evaporation processing step, the reducing agent may be blown into the reduction evaporation chamber by a side-blown atomizer.

In addition, the reduction evaporation chamber may optionally be equipped with a smoke outlet, and the reduction evaporation treatment step may further include introducing secondary air into the top of the reduction evaporation chamber or flue outlet.

In addition, in the reduction evaporation treatment step, the reaction temperature may be 1200 to 1400 ° C.

In addition, when the evaporation reduction treatment step is carried out before the precipitation treatment step, a collector can be added to the reduction evaporation chamber during the reduction evaporation treatment; and when the evaporative reduction treatment step is carried out after the precipitation treatment step, the second vulcanizing agent and / or copper concentrate can be added to the precipitation chamber during the precipitation treatment.

In addition, the manifold can be selected from the first vulcanizing agent and / or copper concentrate, preferably the first vulcanizing agent can be selected from pyrite and / or chalcopyrite, and preferably the second vulcanizing agent can be selected from one or more materials of pyrite, chalcopyrite and slag from smelting of lead and copper.

In addition, the precipitation treatment step may further comprise purging an inert gas and / or sulfur dioxide gas into the precipitation chamber.

In addition, the settling chamber can be insulated during the settling treatment.

According to another aspect of the present invention, there is also provided an integrated slag processing copper smelter, which may include a PP furnace with a melt slag inlet, the PP furnace configured to perform reductive evaporation and deposition of the melt slag for recovering valuable metals contained in the smelt slag, and obtaining harmless slag. The PP furnace can include a cavity, and the cavity contains a reducing evaporation chamber and a settling chamber in communication with each other, where the reducing evaporation chamber is made with the possibility of performing a reductive evaporative treatment of the melt slag, and the settling chamber is made with the possibility of performing the settling treatment of the reduced slag obtained after the reduction evaporative processing; or the settling chamber is configured to perform a precipitation treatment of the melt slag, and the reduction evaporation chamber is configured to perform a reduction evaporation treatment of the precipitated slag obtained after the precipitation treatment.

In addition, the dividing wall can be additionally located in the cavity for dividing the cavity into a reducing evaporation chamber and a settling chamber, wherein the reducing evaporation chamber and the settling chamber can be respectively located on two sides of the dividing wall in the horizontal direction, and the connecting channel of the reducing evaporation chamber chamber and settling chamber can be located near the bottom of the cavity.

In addition, the reduction vaporization chamber may further include an atomizer located on the side of the reduction vaporization chamber and configured to add a reductant to the reduction vaporization chamber; and a feed port located at the top of the reduction evaporation chamber and configured to add a manifold to the reduction evaporation chamber.

In addition, the settling chamber may further include a heating device to effect insulation or heating of the settling chamber.

In addition, the heating device can be a combustion immersion nozzle or an electrode.

In addition, the reduction evaporation chamber can be equipped with a steam outlet, and the settling chamber can be equipped with a copper matte outlet and a harmless slag outlet; or the settling chamber can be equipped with a copper matte outlet, and the reducing evaporation chamber can be equipped with a steam outlet and a harmless slag outlet.

In addition, the integrated slag processing copper smelter may further include an inert gas supply device for blowing the inert gas into the settling chamber.

In addition, the integrated slag processing copper smelter may further include a sulfur dioxide gas supplying device for blowing the sulfur dioxide gas into the settling chamber.

According to the method for copper smelting with integrated slag processing, the PP furnace is used to carry out reductive evaporation and precipitation of the melting slag in order to comprehensively recover valuable metals contained in the melting slag and obtain harmless slag. Valuable metals include one or more of lead, zinc and antimony. The furnace PP includes a cavity, and the cavity contains a reducing evaporation chamber and a settling chamber in communication with each other. The stage of extracting valuable metals contained in the smelting slag includes carrying out a reduction evaporation treatment of the smelting slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and reduced slag and carrying out a precipitation treatment of the reduced slag in a settling chamber to obtain copper matte and harmless slag; or performing a precipitation treatment of the smelter slag in a precipitation chamber to obtain copper matte and precipitated slag, and performing a reduction evaporation treatment of the precipitated slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and a harmless slag.

According to the above method, the copper smelting slag is subjected to a reduction evaporation treatment and a precipitation treatment by an integrated apparatus such as a PP furnace, which can efficiently recover valuable metals such as zinc, lead and antimony contained in the smelter slag. This effectively solves the problem of loss and waste of valuable metals in the existing copper smelting process and prevents the pollution of the environment with these lost metals, and as a result, the complete recovery of the valuable metals contained in the smelting slag and the simultaneous direct discharge of harmless slag from the PP furnace is carried out. On the other hand, reductive evaporation and smelting slag deposition replaces the original slag beneficiation process, which not only greatly reduces the footprint but also simplifies the process and virtually eliminates the contamination caused by the enrichment agent added during the slag beneficiation process. The method has good prospects for large-scale industrial application.

Brief description of figures

The accompanying figures, which form a part of the present invention, are used to provide an improved understanding of the present invention, with exemplary embodiments of the present invention and related descriptions being used to explain the present invention, but not unduly limiting the present invention. Among the figures:

fig. 1 illustrates a schematic structural diagram of a PP furnace in an integrated slag copper smelter according to an embodiment of the present invention;

fig. 2 illustrates a schematic structural diagram of a system for accelerated smelting of copper according to an embodiment of the present invention;

fig. 3 illustrates a schematic structural diagram of a system for accelerated smelting of copper according to an embodiment of the present invention;

fig. 4 illustrates a schematic structural diagram of a system for accelerated smelting of copper according to an embodiment of the present invention; and

fig. 5 illustrates a schematic structural diagram of a system for accelerated copper smelting according to an embodiment of the present invention.

The following conventions are used in the figures:

10 - melting furnace; 20 - copper smelting furnace; 30 - PP oven; 31 - reduction evaporation chamber; 32 - settling chamber; 33 - dividing wall; 40 - foundry equipment.

Detailed Disclosure of Embodiments of the Present Invention

It should be noted that the following detailed description is illustrative and is intended to provide further description of the present invention. All technical and scientific terms used herein have the meanings commonly understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise indicated.

It should be noted that the terms used herein are intended only to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. Unless otherwise required by the context, the singular forms of the terms used herein are intended to indicate the corresponding plural forms. In addition, it should also be understood that the terms "comprise" and / or "include" used in the description indicate that there are corresponding features, steps, operations, devices, assemblies and / or combinations.

As described in the literature, in the conventional art, the method of processing the slag from copper smelting is complex, heavy metals cannot be efficiently recovered, and environmental pollution is significant.

To solve the above problem, the present invention provides a method for copper smelting with integrated slag processing, in which a PP furnace is used to carry out reductive evaporation and deposition of melt slag in order to comprehensively recover valuable metals contained in the melting slag and obtain harmless slag. Valuable metals include one or more of lead, zinc and antimony. The furnace PP includes a cavity, and the cavity contains a reducing evaporation chamber and a settling chamber in communication with each other. The stage of extracting valuable metals contained in the smelting slag includes carrying out a reduction evaporation treatment of the smelting slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and reduced slag and carrying out a precipitation treatment of the reduced slag in a settling chamber to obtain copper matte and harmless slag; or performing a precipitation treatment of the smelter slag in a precipitation chamber to obtain copper matte and precipitated slag, and performing a reduction evaporation treatment of the precipitated slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and a harmless slag.

According to the above method, the copper smelting slag is subjected to a reduction evaporation treatment and a precipitation treatment by an integrated apparatus such as a PP furnace, which can efficiently recover valuable metals such as zinc, lead and antimony contained in the smelter slag. This effectively solves the problem of loss and waste of valuable metals in the existing copper smelting process and prevents the pollution of the environment with these lost metals, and as a result, the complete recovery of the valuable metals contained in the smelting slag and the simultaneous direct discharge of harmless slag from the PP furnace is carried out. On the other hand, reductive evaporation and smelting slag deposition replaces the original slag beneficiation process, which not only greatly reduces the footprint but also simplifies the process and virtually eliminates the contamination caused by the enrichment agent added during the slag beneficiation process. The method has good prospects for large-scale industrial application.

The aforementioned PP furnace is an integrated processing furnace that simultaneously includes a reduction evaporation chamber and a settling chamber. In the first treatment mode, the melting slag is successively subjected to a reduction evaporation treatment and a precipitation treatment. When the melt slag is subjected to a reduction evaporation treatment, the iron (III) oxide (magnetite) contained in the melt slag can be reduced to iron (II) oxide for slag formation, which can reduce the viscosity of the melt slag, and as a result, the subsequent precipitation separation effect is improved and the separation of the second copper matte from the reduced slag is simplified. In this case, after the oxides of valuable metals, such as zinc, lead and antimony, are reduced to metal, they are separated by converting them into pairs of valuable metals due to their volatility, thereby achieving the goal of recovering the valuable metals. After reductive evaporation treatment, reduced slag is obtained (in a fluid state), which enters the settling chamber for precipitation separation to obtain a second copper matte and harmless slag. More importantly, the reduced slag after the reduction evaporation treatment goes directly to the precipitation separation; thus, on the one hand, the processing efficiency can be greatly improved; on the other hand, since the reduced slag goes directly to the precipitation treatment, a more stable fluid state can be maintained and only slight temperature changes occur in the process, or even the temperature does not change. These two reasons improve the precipitation effect, which can further improve the processing efficiency of the second copper matte.

In the second mode of treatment, precipitation treatment is carried out before the stage of reduction evaporative treatment. Thus, the copper matte in the smelter slag can first be separated and then subjected to a reductive evaporation treatment to further recover the valuable metals such as zinc, lead and antimony contained therein.

It should be noted that, according to the present invention, it is preferable to use the mode of performing the reduction evaporation treatment before deposition compared to the mode of performing the deposition before the reductive evaporation treatment. The mode of performing a reductive evaporation treatment prior to deposition has the following advantages: the higher the temperature of the precipitation separation, the better the separation effect. The temperature required for reductive evaporation is very high (1200 to 1400 ° C). Thus, the temperature of the material after the reductive evaporation is high, and separation can be achieved in the deposition step without additional heating. Of course, it is also possible to introduce heat for the precipitation treatment in the mode of performing the reduction evaporation treatment prior to deposition. However, the deposition mode prior to the reduction evaporation treatment is inevitably required to introduce heat during the deposition process. A particular mode of heat injection can be implemented as follows: electrodes (e.g. 3 to 6 electrodes) can be used to effect heating or insulation in the settling chamber, and / or a submerged combustion nozzle can be present (the combustion submerged nozzle releases fuel and oxygen, and the amount of oxygen is controlled in a state of incomplete combustion of fuel). In addition, the mode of performing the reduction evaporation treatment before precipitation has the following advantages: after keeping the reduced slag in the settling chamber for a certain period of time, precipitation stratification of the slag matte can be carried out to a more complete extent, harmless slag is tapped from the top, and the second copper matte is tapped from the bottom.

In a particular operation, the melt slag may be successively and repeatedly subjected to reductive evaporation and precipitation steps, or the melt slag may be divided into multiple portions to perform the reductive evaporation and precipitation steps, respectively. This is understandable to those skilled in the art in accordance with the terms of the present invention, and corresponding descriptions will not be presented herein.

According to a preferred embodiment, the dividing wall is additionally located in the cavity for dividing the cavity into a reducing evaporation chamber and a settling chamber, wherein the reducing evaporation chamber and the settling chamber are respectively located on two sides of the dividing wall in the horizontal direction, and the connecting channel of the reducing evaporation chamber and the settling chamber. the chamber is located near the bottom of the cavity. Thus, a more uniform flow can be achieved between the fluid melt that reacts in the reduction evaporation chamber and the melt that is deposited in the settling chamber, and the dividing wall can block agitation in the reduction evaporation chamber and the material from floating to the surface, and as a result, additionally the effect of precipitation treatment is improved.

According to a preferred embodiment, the reduction evaporation treatment step comprises adding a reducing agent to a reduction evaporation chamber for a reduction evaporation treatment, the reducing agent being preferably selected from one or more of natural gas, coal gas, liquefied petroleum gas, iron powder and a solid carbon-based reductant and the solid carbon-based reducing agent is more preferably selected from one or more lump coal, powdered coal, and coke materials. For the reductive evaporation treatment, an appropriate reagent is selected and the processing of the valuable metals becomes more complete. In actual operation, an oxidant is introduced into the reduction evaporation chamber to provide heat through combustion, and the oxidant may also react with a reducing agent to form a gaseous reducing agent such as carbon monoxide to obtain a reducing effect together with the added reducing agent.

According to a preferred embodiment, a side-blown atomizer is located in the reduction evaporation chamber, and in the reduction evaporation treatment step, the reducing agent is blown into the reduction evaporation chamber by means of a side-blown atomizer. Preferably, the reduction evaporation chamber is further equipped with a smoke outlet, and the reduction evaporation treatment step further comprises introducing secondary air into the top of the reduction evaporation chamber or flue outlet. Thus, the vaporous valuable metal can be oxidized to a valuable metal oxide, and then the steam can be recycled.

According to a preferred embodiment, the reaction temperature in the reductive evaporation treatment step is 1200 to 1400 ° C. More preferably, when the evaporation reduction step is carried out prior to the precipitation step, the manifold is added to the reduction evaporation chamber during the evaporation reduction treatment. The manifold is preferably selected from a first curing agent and / or copper concentrate, and more preferably the first curing agent is selected from pyrite and / or chalcopyrite. When a reductive evaporation treatment step is carried out after the precipitation treatment step, a second curing agent and / or copper concentrate is added to the precipitation chamber during precipitation treatment, and preferably the second curing agent is selected from one or more materials of pyrite, chalcopyrite and lead smelting slag and copper.

The addition of a vulcanizing agent and / or copper concentrate facilitates the recovery of high-grade copper matte in the smelter slag to convert it to lean copper matte, which can reduce the copper content of the harmless slag and further increase copper recovery. In a mode in which the evaporative reduction step is carried out after the precipitation step, since the precipitated slag is further processed in the subsequent evaporation reduction step, it is possible to use a slag such as lead and copper smelting slag as a vulcanizing agent where lead can be vaporized and recycle together with lead in the precipitated slag at the stage of reductive evaporation, so that refractory materials obtained in some production processes can be fully utilized for the purpose of implementing complex resource applications without additional investment in equipment and technological connections.

Preferably, the precipitation treatment step further comprises flushing an inert gas and / or sulfur dioxide gas into the precipitation chamber. This creates a gentle agitation that facilitates the separation of copper and slag. It is preferable to purge sulfur dioxide gas, which acts as a vulcanizing agent, enhancing the stirring effect, and is more preferable to obtain lean copper matte in the precipitation step.

According to a preferred embodiment, the settling chamber is subjected to an insulating treatment during the settling treatment.

According to another aspect of the present invention, there is also provided an apparatus for smelting copper with integrated slag processing, which includes a PP furnace 30. The PP 30 furnace is equipped with a melt slag inlet, and the PP 30 furnace is configured to reduce evaporation and precipitation of the melt slag to recover valuable metals contained in the melting slag, and obtaining a harmless slag. As shown in FIG. 1, the PP furnace 30 includes a cavity, and the cavity contains a reduction evaporation chamber 31 and a settling chamber 32 in communication with each other, where the reduction evaporation chamber 31 is configured to perform a reduction evaporation treatment of the melt slag, and the settling chamber 32 is configured to perform precipitation treatment reduced slag obtained after reduction evaporation treatment; or the settling chamber 32 is configured to perform a precipitation treatment of the melt slag, and the reduction evaporation chamber 31 is configured to perform a reduction evaporation treatment of the precipitated slag obtained after the precipitation treatment.

In the aforementioned device, there is an integrated device such as a PP oven 30, which simultaneously includes a reduction evaporation chamber 31 and a settling chamber 32 in communication with each other. The copper smelting slag can be subjected to a reduction evaporation treatment and a precipitation treatment in the same apparatus, which can efficiently recover valuable metals such as zinc, lead and antimony contained in the smelter slag. This effectively solves the problem of loss and waste of valuable metals in the existing copper smelting process and prevents the pollution of the environment with these lost metals, and as a result, the complete recovery of the valuable metals contained in the smelting slag and the simultaneous direct discharge of harmless slag from the PP furnace is carried out. On the other hand, the reduction evaporation and smelting slag deposition replaces the traditional slag beneficiation process, which not only greatly reduces the footprint, but also simplifies the process and virtually eliminates the pollution caused by the enrichment agent added in the slag beneficiation process. The device has good prospects for large-scale industrial applications.

When the copper smelting slag first enters the reduction evaporation chamber 31 and then enters the precipitation chamber 32, the above PP furnace 30 can perform the reduction evaporation treatment and the precipitation treatment of the smelter slag sequentially. When the smelt slag is subjected to a reduction evaporation treatment, the iron (III) oxide (magnetite) contained in the smelter slag can be reduced to iron (II) oxide for slag formation, which can reduce the viscosity of the smelter slag, and as a result, the subsequent precipitation effect is improved. separation, and simplifies the separation of the copper matte from the reduced slag. In this case, after the oxides of valuable metals such as zinc, lead and antimony are reduced to metals, they are separated by conversion into valuable metal vapors due to their volatility, and as a result, the goal of recovering the valuable metals is achieved. After reductive evaporation treatment, reduced slag (in a fluid state) is obtained, which enters the settling chamber 32 for precipitation separation in order to subsequently obtain copper matte and harmless slag. More importantly, by means of an integrated device, the smelting slag, after the reduction evaporation treatment, goes directly to the precipitation separation; thus, on the one hand, the processing efficiency can be greatly improved; on the other hand, since the reduced slag goes directly to the precipitation treatment, a more stable fluid state can be maintained and only slight temperature changes occur in the process, or even the temperature does not change. These two reasons improve the precipitation effect, which can further improve the processing efficiency of the second copper matte.

When the copper smelting slag first enters the settling chamber 32 and then enters the reduction flash chamber 31, the melt slag can be subjected to a reduction evaporation treatment and a precipitation treatment in sequence. Thus, the copper matte in the smelter slag can first be separated and then subjected to a reduction evaporation treatment to further recover the valuable metals such as zinc contained therein. It should be noted that, according to the present invention, it is preferable to use the mode of performing the reduction evaporation treatment before deposition compared to the mode of performing the deposition before the reductive evaporation treatment. The mode of performing a reductive evaporation treatment prior to deposition has the following advantages: the higher the temperature of the precipitation separation, the better the separation effect. The temperature required for reductive evaporation is very high (1200 to 1400 ° C). Thus, the temperature of the material after the reductive evaporation is high, and separation can be achieved in the deposition step without additional heating. Of course, it is also possible to introduce heat for the precipitation treatment in the mode of performing the reduction evaporation treatment prior to deposition. However, the deposition mode prior to the reduction evaporation treatment is inevitably required to introduce heat during the deposition process. A particular mode of heat injection can be implemented as follows: electrodes (e.g. 3 to 6 electrodes) can be used to effect heating or insulation in the settling chamber, and / or a submerged combustion nozzle can be present (the combustion submerged nozzle releases fuel and oxygen, and the amount of oxygen is controlled in a state of incomplete combustion of fuel). In addition, the mode of performing the reduction evaporation treatment before precipitation has the following advantages: after keeping the reduced slag in the settling chamber for a certain period of time, precipitation stratification of the slag matte can be carried out to a more complete extent, harmless slag is tapped from the top, and the copper matte is tapped from lower part.

According to a preferred embodiment, the dividing wall 33 is additionally located in the cavity for dividing the cavity into a reduction evaporation chamber 31 and a settling chamber 32, a reduction evaporation chamber 31 and a settling chamber 32 are respectively located on two sides of the dividing wall 33 in the horizontal direction, and a connecting channel the recovery evaporation chamber 31 and the settling chamber 32 are located near the bottom of the cavity. Thus, a more uniform flow can be achieved between the fluid melt that reacts in the reduction evaporation chamber 31 and the melt that is deposited in the settling chamber, and the dividing wall can block agitation in the reduction evaporation chamber and the material from floating to the surface, thereby additionally the effect of precipitation treatment is improved. Preferably, the partition wall 33 is a water-cooled partition wall.

According to a preferred embodiment, the reduction evaporation chamber 31 further includes an atomizer and a feed opening. The atomizer is located on the side of the reduction vaporization chamber 31 and is configured to add a reductant to the reduction vaporization chamber 31; and the feed port is located at the top of the reduction evaporation chamber 31 and is configured to add a manifold to the reduction evaporation chamber 31. Such a loading mode can further improve the effect of the reduction evaporation treatment of the smelt slag.

In a preferred embodiment, the settling chamber 32 further includes a heating device for insulating or heating the settling chamber 32. The heating device is an immersion combustion nozzle or electrode (particularly as described above).

According to a preferred embodiment, the reduction evaporation chamber 31 is equipped with a steam outlet, and the settling chamber 32 is equipped with a copper matte outlet and a harmless slag outlet; or the settling chamber 32 is equipped with a copper matte outlet, and the reducing evaporation chamber 31 is equipped with a steam outlet and a harmless slag outlet. Specifically, when the reduction evaporation chamber 31 is used to perform the reduction evaporation treatment of the smelt slag, and the precipitation chamber 32 is used to perform the precipitation treatment of the reduced slag obtained from the reduction evaporation treatment, the reduction evaporation chamber 31 is equipped with a vapor outlet, and the precipitation chamber 32 is equipped with a copper outlet. matte and harmless slag outlet; When the settling chamber 32 is used to perform the precipitation treatment of the smelt slag and the reduction evaporation chamber 31 is used to perform the reduction evaporation treatment of the precipitated slag obtained from the precipitation treatment, the settling chamber 32 is equipped with a copper matte outlet, and the reduction evaporation chamber 31 is equipped with a steam outlet and an outlet for harmless slag.

According to a preferred embodiment, the integrated slag copper smelter further includes an inert gas supply device for blowing an inert gas into the settling chamber 32. Preferably, the integrated slag copper smelter further comprises a sulfur dioxide gas supplying device for blowing sulfur dioxide gas into the settling chamber. chamber 32. This results in poor mixing of the melt during the deposition process, which facilitates the separation of copper and slag. It is preferable to purge sulfur dioxide gas, which acts as a vulcanizing agent, enhancing the stirring effect, and is more preferable to obtain lean copper matte in the precipitation step.

Preferably, the aforementioned apparatus further includes a blower for introducing secondary air into the steam outlet or above the reduction evaporation chamber. Thus, the vaporous value metal can be oxidized to a valuable metal oxide, and then the vapor can be processed.

In traditional techniques, in addition to the processing of the smelter slag, a large area of slow slag cooling and a complex slag beneficiation process are required, construction costs and technical difficulties increase, there are problems of loss of valuable metals and environmental pollution, and the entire copper smelting process is a long process. To solve the above problems, the present invention provides a method for accelerated copper smelting. Thus, the applicable copper smelting apparatus includes a smelter, a copper smelting furnace, a PP furnace, a first flow tank, and a second flow tank. The smelting furnace is equipped with a copper matte outlet and a melting slag outlet. The copper smelter is equipped with a copper matte inlet, the copper matte inlet being in communication with the copper matte outlet through the first flow tank. The PP furnace is equipped with a melt slag inlet, and the melt slag inlet is in communication with the melt slag outlet through the second flow tank. The method for accelerated smelting of copper includes the following stages: smelting copper concentrate in a smelting furnace to obtain the first copper matte and smelting slag; carrying out the reaction of obtaining copper from the first copper matte in a copper smelter for producing anode copper and copper smelting slag; and performing reductive evaporation and deposition of the smelting slag in the PP furnace for the complex recovery of valuable metals contained in the smelting slag and obtaining a harmless slag, where the valuable metals include one or more metals from lead, zinc and antimony. In the method of accelerated copper smelting, the production of anode copper, the complete extraction of valuable metals contained in the melting slag, and the direct production of harmless slag using a PP furnace are carried out. Compared to traditional technology, the above method significantly reduces the overall process time, and also provides a reduction in construction costs, a decrease in technical complexity, achieving a comprehensive recycling of resources and eliminating environmental hazards.

As used herein, the term “harmless slag” means a slag that does not cause heavy metal contamination.

PP oven means complete recycling oven.

According to the aforementioned method, after the smelting slag is produced, the smelting slag is subjected to reductive evaporation and precipitation, in which valuable metals such as zinc, lead and antimony contained in the smelting slag can be recovered. This effectively solves the problem of loss and waste of valuable metals in the existing copper smelting process and prevents pollution of the environment with these lost metals. On the other hand, reductive evaporation and smelting slag deposition replaces the original slag beneficiation process, which not only greatly reduces the footprint but also simplifies the process and virtually eliminates the contamination caused by the enrichment agent added during the slag beneficiation process. It should be noted, however, that an integrated copper smelter is used in the copper smelting method of the present invention. The copper matte outlet of the smelting furnace is in direct communication with the copper smelter through the flow tank, and the slag outlet of the smelting furnace is in direct communication with the PP furnace through the flow tank, which provides accelerated copper smelting. At the same time, the production of anode copper, the complete extraction of valuable metals contained in the melting slag, and the direct production of harmless slag using a PP furnace are carried out, and the method has good prospects for large-scale industrial application.

In a preferred embodiment, the step of smelting the copper concentrate in the smelting furnace includes mixing the copper concentrate with a first flux to form a mixture, introducing the mixture into the smelting furnace, and performing smelting with a first oxidant to form a first copper matte and smelting slag. Preferably, a bottom-blown melt method or a side-blown melt method is used in the melting process. The use of a bottom-blown melting method or a side-blown melting method can further improve the quality of the copper matte. More preferably, the first flux is selected from quartzite and / or limestone; and the first oxidant is selected from one or more materials of oxygen, compressed air, and oxygen-enriched air.

As used herein, the term "oxygen-enriched air" means a gas that has a higher oxygen concentration than the oxygen concentration in air and can be obtained, for example, by introducing oxygen into air.

According to a preferred embodiment, in the step of melting the copper concentrate in the smelting furnace, the first oxidant is introduced in an amount of 120 Nm ³ or more O ₂ per ton of copper concentrate to obtain a copper content in the first copper matte of more than or equal to 70 wt. %. The first oxidant is introduced in a controlled amount of 120 Nm ³ or more O ₂ per ton of copper concentrate, so that the copper content of the first copper matte is more than or equal to 70 wt. %. Thus, the problem of a large amount of copper smelting slag caused by the excessively low copper content in the first copper matte can be eliminated, and as a result, the problem of the resulting low copper yield is prevented. More preferably, the first oxidant is introduced in an amount of 120 to 200 Nm ³ or more O ₂ per ton of copper concentrate to obtain a copper content in the first copper matte of 70 to 78 wt. %. Thus, the problem of the high copper content in the smelter slag caused by the excessively high copper content in the first copper matte can also be eliminated, and as a result, the problem of the resulting low copper yield is prevented. In addition, when the copper matte contains 70 to 78% copper, elements such as lead, zinc and antimony enter the melt slag in the form of oxides, which facilitates the subsequent recovery of these elements in the PP furnace. If the copper matte has a low copper content of, for example, 40 to 50%, some of these elements will remain in the copper matte, which is not critical for subsequent processing in the PP furnace.

According to a preferred embodiment, in the step of melting the copper concentrate in the smelting furnace, the cooled copper smelting slag is placed in the smelting furnace and melted together with the copper concentrate. By adding the cooled copper smelter slag, the problem of excessive heating during the smelting process can be alleviated, the smelting process can be carried out more easily at a higher oxygen enrichment concentration, and thus the amount of steam produced can be reduced.

In addition, it is preferable that the melting point in the melting process is 1150 to 1300 ° C, and the first flux is added in an amount of 1 to 20 wt. % in relation to the total mass of copper ore.

The above reaction for producing copper is used to directly produce anode copper. According to a preferred embodiment, the step of carrying out the reaction of producing copper from the first copper matte in the copper smelter further comprises simultaneously adding cold materials to the copper smelter, and / or spraying a water spray into the copper smelter, and / or providing a cooling element outside the body of the copper smelter where the cold materials are include one or more scrap copper, electrolytic residual copper, and solid copper matte.

To reduce the duration of the process, the PRC patent No. CN 103382528 proposes a two-stage copper smelting method, according to which copper concentrate is first melted in a smelting furnace to obtain a matte containing from 65 to 78% copper, and then anode copper is directly obtained in the redox reaction in converter furnace. This method is characterized mainly by the heat balance problem and the vapor problem it creates: a redox reaction in a converter furnace produces a large amount of heat, which must be removed in some way to maintain heat balance. In this process, the amount of oxygen, air and nitrogen is controlled, and the heat of reaction is removed by means of gas, so the total amount of injected gas must be increased and the relative oxygen concentration is not necessarily reduced, which makes the amount of steam large and the sulfur dioxide content of the steam very low. ... Thus, downstream steam treatment and acid production systems are large, requiring significant capital investment and high operating costs. In this case, the amount of introduced gas is large, which will lead to more intensive mixing of the entire melt. The kinetic energy of the melt-back lining is increased and the life of the furnace is shortened. In addition, the patent does not specify a method for achieving a matte quality of 65 to 78% in a melting furnace.

In contrast to the heat balance mode of the aforementioned patent, the present invention employs a heat balance mode which involves adding cold material to the copper smelter and / or spraying water mist into the copper smelter and / or providing a cooling element outside the copper smelter body. The following are the benefits of each mode.

For the cold material addition mode: since the reaction taking place in the copper smelter is an exothermic reaction, the addition of cold material is favorable to achieve heat balance, and the heat released during the reaction process is used to melt the cold material and the heat is used to its fullest ... The added cold material may be one or more of scrap copper, electrolytic residual copper, and solid copper matte. Copper smelters currently use separate metallurgical furnaces for melting and refining secondary copper materials such as scrap copper and electrolytic residual copper. This requires not only additional fuel to heat the cold material, but, more importantly, the purchase of separate equipment, the construction of separate shops and the placement of individual workers, which significantly increases the operating costs of the plant. Thus, by applying the aforementioned embodiment of the present invention, the equipment, the building and the number of employees of the enterprise that recycle copper scrap, electrolytic residual copper and other materials are not increased, energy and other resources required to melt the material are saved, and significant economic benefits are obtained. In short, applying significant heat from a copper smelter to melt copper reduces the cost of copper processing.

For the mode of providing a cooling element to the furnace body: it is preferable to use a water jacket, which also promotes heat dissipation to achieve a thermal balance of the furnace body.

For the spray mode of water aerosol: since water absorbs a large amount of heat during gasification, it can accept more heat in the case of a smaller final gas volume, so that the copper production reaction can be carried out under a high oxygen concentration purge and a high oxygen concentration simply solves the aforementioned problems caused by low oxygen concentration purging in patents such as CN 103382528. In addition, water aerosol atomization has the following advantages. 1) The oven temperature is controlled more efficiently. Since gasification of water can consume a large amount of heat, a small change in the amount of sprayed water can cause a large change in heat, so that the oven temperature can be controlled more accurately and efficiently. 2) Increases the life of the sprayer. Due to the high purging efficiency with a high oxygen concentration, the amount of gas atomized by the atomizer is less than in the case of a low oxygen concentration, the working load of the atomizer is low, and the cooling effect of water can also increase the life of the atomizer itself. 3) For example, the oxygen concentration in the enriched air is 40%, and the melt strength can be approximately 1 times higher than in the case of low oxygen concentration (21% to 25%). With the same amount of steam, a high oxygen concentration in the enriched air (eg 40%) can provide almost double the amount of material. 4) The power consumption is low and the power consumption is low. The power of the water spray device is significantly less than the size of the air blowing device.

Due to the aforementioned heat balance regime according to the present invention, the copper smelter according to the present invention can be used under a high oxygen concentration blowing condition. According to a preferred embodiment, in the copper production reaction step, the first copper matte is oxidized by introducing oxygen-enriched air into a copper smelter to carry out a copper-producing reaction, wherein the oxygen-enriched air by volume is 30 to 80% by volume. Although CN 103382528 mentions that the oxygen concentration in the converter furnace is 9 to 60% because it uses gas to remove heat, the actual oxygen concentration can only be kept below 25%, and the high oxygen concentration in the enriched air is actually cannot be reached. According to the present invention, the aforementioned heat balance means can fully provide an oxygen concentration of 30 to 80% in the enriched air.

According to a preferred embodiment, in the copper production reaction step, after the oxidation treatment step, copper metal and copper smelting slag are produced; when metallic copper in a copper smelting furnace contains less than 0.2 wt. % oxygen, copper smelting slag is tapped from the copper smelter, and the metallic copper is anode copper; when the oxygen content of the metallic copper in the copper smelting furnace is more than 0.2 wt. %, copper-smelting slag is discharged from the copper-smelting furnace, and the reductant is introduced into the copper-smelting furnace to carry out the reduction reaction of copper oxide impurities in metallic copper in order to obtain anode copper.

The objective of the copper production reaction is to remove the sulfur and other impurity elements contained in the first copper matte to obtain high quality anode copper. The impurity removal process mainly uses an oxidation reaction to remove oxidized slag impurities from copper. When metallic copper in a copper smelting furnace contains less than 0.2 wt. % oxygen, on the one hand, it turns out that impurities are oxidized to a greater extent and enter the copper smelting slag, and, on the other hand, copper is practically not oxidized. At the same time, according to the present invention, only the oxidation reaction is carried out in the copper production reaction, the reduction reaction does not occur, and anode copper can be directly produced. When the oxygen content of the copper metal in the copper smelting furnace is more than 0.2 wt. %, it turns out that part of the copper is oxidized during the removal of impurities. At the same time, a reducing agent can be additionally added to carry out the reduction reaction of said copper oxide impurities. In addition, according to the present invention, the reduction reaction is carried out after the copper slag is discharged from the copper smelter, and it is also possible to prevent the melt of previously oxidized impurities and slag from returning to metallic copper, and as a result, the quality of the anode copper is further ensured.

According to a preferred embodiment, in the oxidation step of the first copper matte in the copper smelter, the second flux is added from above to the copper smelter; the bottom blowing mode is used to introduce oxygen-enriched air into the copper smelter for oxidation treatment, or the first reducing agent is optionally sprayed for reduction. Preferably, the second flux is selected from quartzite and / or limestone. Preferably, the first reducing agent is selected from one or more natural gas, liquefied petroleum gas, and a carbon-based solid reducing agent. Preferably, the solid carbon-based reducing agent is powdered carbon and / or a solid carbonaceous reducing agent. The above processes and reagents can further enhance the effect of the copper production reaction.

The function of the PP furnace is to extract the valuable metals contained in the smelting slag by means of reductive evaporation and precipitation to obtain a harmless slag. According to a preferred embodiment, the PP furnace includes a cavity, the cavity comprising a reduction evaporation chamber and a settling chamber in communication with each other. The stage of recovering valuable metals contained in the smelting slag includes carrying out a reduction evaporation treatment of the smelting slag in a reduction evaporation chamber to obtain a vaporous valuable metal and a reduced slag, and performing precipitation treatment of the reduced slag in a settling chamber to obtain a second copper matte and harmless slag; or performing a precipitation treatment of the smelter slag in a precipitation chamber to obtain a second copper matte and a precipitated slag, and performing a reduction evaporation treatment of the precipitated slag in a reduction evaporation chamber to obtain a vaporous valuable metal and a harmless slag.

The aforementioned PP furnace is an integrated processing furnace that simultaneously includes a reduction evaporation chamber and a settling chamber. In the first treatment mode, the melting slag is successively subjected to a reduction evaporation treatment and a precipitation treatment. When the smelt slag is subjected to a reduction evaporation treatment, the iron (III) oxide (magnetite) contained in the smelter slag can be reduced to iron (II) oxide for slag formation, which can reduce the viscosity of the smelter slag, and as a result, the subsequent precipitation effect is improved. separation, and simplifies the separation of the second copper matte from the reduced slag. In this case, after the oxides of valuable metals such as zinc, lead and antimony are reduced to metals, they are separated by conversion into valuable metal vapors due to their volatility, and as a result, the goal of recovering the valuable metals is achieved. After reductive evaporation treatment, reduced slag is obtained (in a fluid state), which enters the settling chamber for precipitation separation to obtain a second copper matte and harmless slag. More importantly, the reduced slag after the reduction evaporation treatment goes directly to the precipitation separation; thus, on the one hand, the processing efficiency can be greatly improved; on the other hand, since the reduced slag goes directly to the precipitation treatment, a more stable fluid state can be maintained and only slight temperature changes occur in the process, or even the temperature does not change. These two reasons improve the precipitation effect, which can further improve the processing efficiency of the second copper matte.

In the second mode of treatment, precipitation treatment is carried out before the stage of reduction evaporative treatment. Thus, the copper matte in the smelter slag can first be separated and then subjected to a reductive evaporation treatment to further recover the valuable metals such as zinc, lead and antimony contained therein.

It should be noted that, according to the present invention, it is preferable to use the mode of performing the reduction evaporation treatment before deposition compared to the mode of performing the deposition before the reductive evaporation treatment. The mode of performing a reductive evaporation treatment before deposition has the advantage that the higher the temperature of the precipitation separation, the better the separation effect. The temperature required for reductive evaporation is very high (1200 to 1400 ° C). Thus, the temperature of the material after the reductive evaporation is high, and separation can be achieved in the deposition step without additional heating. Of course, it is also possible to introduce heat for the precipitation treatment in the mode of performing the reduction evaporation treatment prior to deposition. However, the deposition mode prior to the reduction evaporation treatment is inevitably required to introduce heat during the deposition process. A particular mode of heat injection can be implemented as follows: electrodes (e.g. 3 to 6 electrodes) can be used to effect heating or insulation in the settling chamber, and / or a submerged combustion nozzle can be present (the combustion submerged nozzle releases fuel and oxygen, and the amount of oxygen is controlled in a state of incomplete combustion of fuel). In addition, the mode of performing the reduction evaporation treatment before precipitation has the following advantages: after keeping the reduced slag in the settling chamber for a certain period of time, precipitation stratification of the slag matte can be carried out to a more complete extent, harmless slag is tapped from the top, and the second copper matte is tapped from the bottom.

In a particular operation, the melt slag may be successively and repeatedly subjected to reductive evaporation and precipitation steps, or the melt slag may be divided into multiple portions to perform the reductive evaporation and precipitation steps, respectively. This is understandable to those skilled in the art in accordance with the terms of the present invention, and corresponding descriptions will not be presented herein.

According to a preferred embodiment, the dividing wall is additionally located in the cavity for dividing the cavity into a reducing evaporation chamber and a settling chamber, wherein the reducing evaporation chamber and the settling chamber are respectively located on two sides of the dividing wall in the horizontal direction, and the connecting channel of the reducing evaporation chamber and the settling chamber. the chamber is located near the bottom of the cavity. Thus, a more uniform flow can be achieved between the fluid melt that reacts in the reduction evaporation chamber and the melt that is deposited in the settling chamber, and the dividing wall can block agitation in the reduction evaporation chamber and the material from floating to the surface, and as a result, additionally the effect of precipitation treatment is improved.

According to a preferred embodiment, the reduction evaporation treatment step comprises adding a second reducing agent to a reduction evaporation chamber for the reduction evaporation treatment, the second reducing agent being preferably selected from one or more materials of natural gas, coal gas, liquefied petroleum gas, iron powder and a solid reducing agent on carbon-based, and the solid carbon-based reducing agent is preferably selected from lump coal and / or powdered coal. For the reductive evaporation treatment, an appropriate reagent is selected and the processing of the valuable metals becomes more complete. In actual operation, an oxidant is introduced into the reduction evaporation chamber to provide heat through combustion, and the oxidant may also react with a reducing agent to form a gaseous reducing agent such as carbon monoxide to obtain a reducing effect together with the added reducing agent.

According to a preferred embodiment, a side-blown atomizer is located in the reduction evaporation chamber, and in the reduction evaporation treatment step, the second reducing agent is blown into the reduction evaporation chamber by means of a side-blown atomizer. Preferably, the reduction evaporation chamber is further equipped with a smoke outlet, and the reduction evaporation treatment step further comprises introducing secondary air into the top of the reduction evaporation chamber or flue outlet. Thus, the vaporous valuable metal can be oxidized to a valuable metal oxide, and then the vapor can be recovered.

According to a preferred embodiment, the reaction temperature in the reductive evaporation treatment step is 1200 to 1400 ° C. More preferably, when the evaporation reduction step is carried out prior to the precipitation step, the manifold is added to the reduction evaporation chamber during the evaporation reduction treatment. The manifold is preferably selected from a first curing agent and / or copper concentrate, and more preferably the first curing agent is selected from pyrite and / or chalcopyrite. When a reductive evaporation treatment step is carried out after the precipitation treatment step, a second curing agent and / or copper concentrate is added to the precipitation chamber during precipitation treatment, and preferably the second curing agent is selected from one or more materials of pyrite, chalcopyrite and lead smelting slag and copper.

The addition of a vulcanizing agent and / or copper concentrate facilitates the recovery of high-grade copper matte in the smelter slag to convert it to a lean copper matte (second copper matte), which can reduce the copper content of the harmless slag and further increase copper recovery. In a mode in which the evaporative reduction step is carried out after the precipitation step, since the precipitated slag is further processed in a subsequent evaporation reduction step, it is possible to use a slag such as lead and copper smelting slag as a vulcanizing agent where lead can be vaporized. processed together with lead in precipitated slag at the stage of reductive evaporation, so that refractory materials obtained in some production processes can be fully utilized in order to implement complex resource applications without additional investment in equipment and technological connections.

Preferably, the precipitation treatment step further comprises flushing an inert gas and / or sulfur dioxide gas into the precipitation chamber. This creates a gentle agitation that facilitates the separation of copper and slag. It is preferable to purge sulfur dioxide gas, which acts as a vulcanizing agent, enhancing the stirring effect, and is more preferable to obtain lean copper matte in the precipitation step.

According to a preferred embodiment, after the step of producing the second copper matte, the copper smelting process further comprises the step of returning the second copper matte to the smelter for smelting. This can increase the copper utilization rate.

According to a preferred embodiment, after the step of producing the second copper matte, the copper smelting process further comprises the step of returning the second copper matte to the converter furnace to produce copper. This can increase the copper utilization rate. Since the second copper matte (and the solid second copper matte) is usually added chilled, it can also function for heat balance purposes.

According to a preferred embodiment, in the step of carrying out the reaction for producing copper from the first copper matte, the copper produced is molten copper; after the copper production reaction step, the copper smelting process further comprises a molten copper casting step. This allows the molten copper to be further cast into a product such as anode copper sheet.

In accordance with another aspect of the present invention, a copper smelting system is also provided. As shown in FIG. 2, the copper smelting system includes a smelter 10, a copper smelter 20, a PP 30 furnace (PP 30 furnace, which is shown in FIG. 1), a first flow tank and a second flow tank where the melting furnace 10 is configured to melt copper concentrate to obtain first copper matte and smelting slag; the smelting furnace 10 is equipped with a first copper matte outlet and a melt slag outlet; the copper smelter 20 is equipped with a copper matte inlet that is in communication with the first copper matte outlet through the first flow tank; the copper smelter 20 is configured to carry out a reaction of producing copper from the first copper matte to produce anode copper and copper smelter slag; The PP 30 furnace is equipped with a melt slag inlet, which is in communication with the melt slag outlet through a second flow tank to carry out reductive evaporation and precipitation of the melt slag in order to recover valuable metals contained in the melt slag.

In the apparatus described above, copper ore can be smelted using a smelter 10 to obtain a first copper matte and smelting slag. After the smelting slag is produced, the smelting slag can be subjected to reductive evaporation and deposition using a PP 30 furnace, in which valuable metals such as zinc, lead and antimony contained in the smelting slag can be recovered. This effectively solves the problem of loss and waste of valuable metals in the existing copper smelting process and prevents pollution of the environment with these lost metals. On the other hand, reductive evaporation and smelting slag deposition replaces the original slag beneficiation process, which not only greatly reduces the footprint but also simplifies the process and virtually eliminates the contamination caused by the enrichment agent added during the slag beneficiation process. It should be noted here that in the copper smelting apparatus according to the present invention, the PP furnace 30 is in communication with the slag outlet of the smelting furnace 10, and the copper smelter 20 is in communication with the copper matte outlet of the smelting furnace 10. After the copper ore is melted to obtain the first copper matte and smelting slag, the first copper matte is subjected to a copper-making reaction to obtain anode copper of higher quality and, on the other hand, the smelting slag obtained in the smelting process is processed, that is, the use of an integrated copper smelter significantly reduces the duration of the copper smelting steps and has a good the prospect of large-scale industrial applications.

According to a preferred embodiment, the PP 30 furnaces are arranged in parallel or in series. Thus, a plurality of furnaces PP 30 can produce second copper matte, valuable metal, and water-degradable harmless slag through continuous operation or alternate operation, and as a result, processing efficiency is improved. Of course, it is also possible to use a plurality of PP 30 furnaces for sequential processing of the melt slag in order to further improve the processing efficiency. The corresponding descriptions are not presented in this document.

According to a preferred embodiment of the present invention, the copper smelting furnaces 20 are arranged in parallel. It also improves the capabilities of the device.

According to an exemplary embodiment of the present invention, as illustrated in FIG. 3, two copper smelting furnaces 20 are arranged in parallel, and one PP furnace is present; or

according to another exemplary embodiment of the present invention, as illustrated in FIG. 4, one copper smelter 20 is present and two PP furnaces are arranged in parallel; or

according to a further exemplary embodiment of the present invention, as illustrated in FIG. 5, two copper smelting furnaces 20 are located in parallel, and two PP furnaces are located in parallel.

According to a preferred embodiment, the PP furnace 30 includes a cavity, the cavity comprising a reduction evaporation chamber 31 and a settling chamber 32 in communication with one another. The reduction evaporation chamber 31 is in communication with the outlet of the melt slag to carry out the reduction evaporation treatment of the melt slag. The reduction evaporation chamber 31 is equipped with a steam outlet. The settling chamber 32 communicates with the reducing flash chamber 31 to perform the settling treatment of the reduced slag after the flash reducing treatment, and the settling chamber 32 is equipped with a second copper matte outlet and a slag outlet (as shown in FIG. 1). Alternatively, the PP furnace 30 includes a cavity, the cavity comprising a reduction evaporation chamber 31 and a settling chamber 32 in communication with each other. The settling chamber 32 is in communication with the melt slag outlet to carry out the settling treatment of the melt slag, and the settling chamber 32 is equipped with a second copper matte outlet. The reduction evaporation chamber 31 is in communication with the settling chamber 32 to carry out a reduction evaporation treatment of the precipitated slag after the precipitation treatment, and the reduction evaporation chamber 31 is equipped with a vapor outlet and a slag outlet.

Thus, the PP furnace 30 proposed according to the present invention is an integrated device that includes a reduction evaporation chamber 31 and a settling chamber 32 in communication with each other. The coupling relationship between the reduction evaporation chamber 31 and the precipitation chamber 32 may determine that the reductive evaporation and deposition are carried out sequentially, or the deposition and the reduction evaporation are performed sequentially.

When the reduction evaporation chamber 31 is in communication with the melt slag outlet and the settling chamber 32 is in communication with the reduction evaporation chamber 31, the reduction evaporation treatment and the precipitation treatment of the melt slag can be performed sequentially. When the smelt slag is subjected to a reduction evaporation treatment, the iron (III) oxide (magnetite) contained in the smelter slag can be reduced to iron (II) oxide for slag formation, which can reduce the viscosity of the smelter slag, and as a result, the subsequent precipitation effect is improved. separation, and simplifies the separation of the second copper matte from the reduced slag. In this case, after the oxides of valuable metals such as zinc, lead and antimony are reduced to metals, they are separated by conversion into valuable metal vapors due to their volatility, and as a result, the goal of recovering the valuable metals is achieved. After reductive evaporation treatment, reduced slag (in a fluid state) is obtained, which enters the settling chamber for precipitation separation in order to further obtain the second copper matte and harmless slag. More importantly, by means of an integrated device, the smelting slag, after the reduction evaporation treatment, goes directly to the precipitation separation; thus, on the one hand, the processing efficiency can be greatly improved; on the other hand, since the reduced slag goes directly to the precipitation treatment, a more stable fluid state can be maintained and only slight temperature changes occur in the process, or even the temperature does not change. These two reasons improve the precipitation effect, which can further improve the processing efficiency of the second copper matte.

When the reduction evaporation chamber 31 is in communication with the melt slag outlet and the settling chamber 32 is in communication with the reduction evaporation chamber 31, the precipitation treatment and the reduction evaporation treatment of the melt slag can be carried out sequentially. Thus, the copper matte in the smelter slag can first be separated and then subjected to a reductive evaporation treatment to further recover the valuable metals such as zinc, lead and antimony contained therein. It should be noted that, according to the present invention, it is preferable to use the mode of performing the reduction evaporation treatment before deposition compared to the mode of performing the deposition before the reductive evaporation treatment. The mode of performing a reductive evaporative treatment before deposition has the following advantages: the higher the temperature of the precipitation separation, the better the separation effect. The temperature required for reductive evaporation is very high (1200 to 1400 ° C). Thus, the temperature of the material after the reductive evaporation is high, and separation can be achieved in the deposition step without additional heating. Of course, it is also possible to introduce heat for the precipitation treatment in the mode of performing the reduction evaporation treatment prior to deposition. However, the deposition mode prior to the reduction evaporation treatment is inevitably required to introduce heat during the deposition process. A particular mode of heat injection can be implemented as follows: electrodes (e.g. 3 to 6 electrodes) can be used to effect heating or insulation in the settling chamber, and / or a submerged combustion nozzle can be present (the combustion submerged nozzle releases fuel and oxygen, and the amount of oxygen is controlled in a state of incomplete combustion of fuel). In addition, the mode of performing the reduction evaporation treatment before precipitation has the following advantages: after keeping the reduced slag in the settling chamber for a certain period of time, precipitation stratification of the slag matte can be carried out to a more complete extent, harmless slag is tapped from the top, and the second copper matte is tapped from the bottom.

In a preferred embodiment, as shown in FIG. 1, the dividing wall 33 is additionally located in the cavity for dividing the cavity into a reducing evaporation chamber 31 and a settling chamber 32, a reducing evaporation chamber 31 and a settling chamber 32, respectively, are located on two sides of the dividing wall 33 in the horizontal direction, and a connecting channel of the reducing evaporation the chamber 31 and the settling chamber 32 are located near the bottom of the cavity. Thus, a more uniform flow can be achieved between the fluid melt that reacts in the reduction evaporation chamber 31 and the melt that is deposited in the settling chamber, and the dividing wall can block agitation in the reduction evaporation chamber and the material from floating to the surface, thereby additionally the effect of precipitation treatment is improved. Preferably, the partition wall 33 is a water-cooled partition wall.

According to a preferred embodiment, the reduction evaporation chamber 31 further includes a side-blown atomizer. A side-blown atomizer is located at the side or bottom of the reduction vaporization chamber 31 and is configured to spray the reductant into the reduction vaporization chamber 31. Preferably, the reduction vaporization chamber is further equipped with a smoke outlet to remove valuable metal vapors. In addition, preferably the reduction evaporation chamber is additionally equipped with a feed opening for adding a manifold to the reduction evaporation chamber 31.

According to a preferred embodiment, when the reduction evaporation chamber 31 is in communication with the melt slag outlet and the settling chamber 32 is in communication with the reducing evaporation chamber 31, the settling chamber 32 further includes a heating device for insulating or heating the settling chamber 32. This can prevent cooling of the settling chamber 32 , further providing the effect of precipitation separation. Preferably, the heating device is an immersion combustion nozzle or electrode.

In a preferred embodiment, the copper smelter 20 is further equipped with a second gun and flux inlet, where a second gun is located on the side or bottom of the copper smelter 20 to alternately add oxidant or reductant to the copper smelter 20, and the flux inlet is used to feed the flux. Thus, the refining of the copper matte can be carried out in the same equipment of the copper smelter, and the quality is improved to that of electrolytic anode copper. Preferably, the body of the copper smelter 20 is a horizontal cylindrical furnace body. In actual operation, a plurality of copper smelting furnaces 20 can be arranged in parallel for alternating operation or simultaneous operation. Preferably, an appropriate amount of water mist can be sprayed into the second atomizer to absorb excess heat generated during the copper smelting process, thereby reducing the amount of steam and increasing the life of the atomizer.

In a preferred embodiment, the copper smelter 20 is also equipped with a molten copper outlet; the copper smelting system further includes casting equipment 40, where casting equipment 40 is in communication with the outlet of molten copper for casting molten copper. In the step of introducing the first copper matte into the copper production reaction, the resulting anode copper is molten copper. With the casting equipment 40, molten copper can then be cast to produce a product such as anode copper sheet. Preferably, the casting equipment 40 is a double disc casting machine.

According to a preferred embodiment, the copper smelter 20 is further equipped with a copper slag outlet for removing the copper slag; The smelting furnace 10 is additionally equipped with a copper smelting slag inlet for introducing cooled copper smelting slag into the smelting furnace 10.

According to a preferred embodiment, the smelter 10 is further equipped with a second copper matte inlet for introducing the cooled second copper matte into the smelting furnace 10. This can further increase the copper utilization.

According to a preferred embodiment, the copper smelter 20 is further equipped with a cold material inlet for adding one or more residual electrolytic copper, scrap copper and solid copper materials to the copper smelter 20. Thus, the residual electrolytic copper from the aforementioned electrolysis process as well as purchased scrap copper and Solid copper matte can be introduced into the copper smelter as a cold material to better balance the heat in the copper smelter, and conditions are created to introduce oxygen into the copper smelter.

According to a preferred embodiment, the copper smelting system further includes a cooling device for cooling the copper smelter 20. This ensures that the copper smelter 20 maintains a heat balance during the copper reaction step, conditions are created for introducing oxygen into the copper smelter, and further the service life of the furnace is increased. The cooling device includes, but is not limited to, a negative pressure water jacket or spray cooling device.

In a preferred embodiment, the melting furnace 10 is a top-blown melting furnace, a suspension smelting furnace, a bottom-blown melting furnace or a side-blown melting furnace.

The beneficial effects of the present invention are further illustrated by the following embodiments:

Embodiment 1

The copper smelter shown in FIG. 2 is used for copper smelting, and in each device the process conditions are defined as follows.

Melting furnace: melting temperature is 1300 ° C; the flux is quartzite added in an amount of 10% with respect to the total mass of the copper ore; the oxidizing agent is oxygen added at 150 Nm ³ O ₂ per ton of copper ore.

Copper smelter: the flux is quartzite added in an amount of 20% with respect to the total mass of the first copper matte; the oxidizing agent is oxygen-enriched air having an oxygen volume content of 40% and added in an amount of 200 Nm ³ O ₂ per tonne of the first copper matte; the spray gun is used to spray the oxidizing agent into the copper smelter while simultaneously spraying a water aerosol; while cold copper scrap is added to the copper smelter; the reducing agent is powdered coal; the copper smelting slag is tapped off before the reducing agent is sprayed; the copper smelting slag is cooled and returned to the smelting furnace.

Furnace PP: reduction evaporation and deposition are carried out sequentially; in the stage of reductive evaporation treatment, the reaction temperature is 1200 ° C; the reducing agent is powdered coal added in an amount of 10% with respect to the total mass of the smelting slag; a small amount of oxygen is introduced to provide heat to support combustion; sulfur dioxide gas is introduced into the settling chamber and a curing agent (pyrite) is added to obtain a lean copper matte; the resulting poor copper matte is returned to the smelter.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte is produced, which contains 75% copper, and 650,000 tons of smelting slag is obtained, which contains 3% copper and 2.77% zinc; The copper smelter produces 235,000 tonnes of anode copper containing 99.3% copper and 0.05% sulfur; thereafter, the melting slag is treated with a PP (reductive evaporation and precipitation) furnace, the slag contains 0.3% copper and 0.28% zinc. The copper recovery for the entire system is approximately 99% and the zinc recovery is approximately 80%.

Embodiment 2

The processing method is the same as the method according to Embodiment 1, except that the raw material (copper ore) has the following differences.

1.5 million tons of copper concentrate are processed per year, where copper concentrate contains 25% copper, 1.5% zinc and 0.5% antimony; by smelting, 400,000 tons of copper matte is produced, which contains 75% copper, and 1 million tons of smelting slag is obtained, which contains 2% copper and 2.03% zinc; the copper smelter produces 450,000 tons of anode copper containing 99.2% copper and 0.03% sulfur; thereafter, the smelting slag is processed using a PP furnace, the slag contains 0.3% copper and 0.20% zinc. The copper recovery for the entire system is approximately 99% and the zinc recovery is approximately 80%.

Embodiment 3

The processing method is the same as Embodiment 1 except for the following conditions.

Melting furnace: melting temperature is 1300 ° C; the flux is quartzite added in an amount of 20% with respect to the total weight of the copper ore; the oxidizing agent is oxygen added in an amount of 200 Nm ³ O ₂ per ton of copper ore.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 260,000 tons of copper matte is produced, which contains 78% copper, and 620,000 tons of smelting slag is obtained, which contains 4% copper and 2.05% zinc; the copper smelter produces 236,000 tonnes of anode copper containing 99.5% copper and 0.03% sulfur; thereafter, the smelting slag is treated with a PP (reductive evaporation and precipitation) furnace, the slag contains 0.2% copper and 0.26% zinc. The copper recovery for the entire system is approximately 99% and the zinc recovery is approximately 82%.

Embodiment 4

The processing method is the same as Embodiment 1 except for the following conditions.

Melting furnace: melting point is 1150 ° C; the flux is quartzite, added in an amount of 1% with respect to the total mass of the copper ore; the oxidizing agent is oxygen added at 120 Nm ³ O ₂ per ton of copper ore.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 260,000 tons of copper matte are produced, which contains 70% copper, and 700,000 tons of smelting slag are obtained, which contains 2.5% copper and 3.25% zinc; the copper smelter produces 231,000 tonnes of anode copper containing 99.1% copper and 0.03% sulfur; thereafter, the melting slag is treated with a PP (reductive evaporation and deposition) furnace, the slag contains 0.3% copper and 0.27% zinc. The copper recovery for the entire system is approximately 99% and the zinc recovery is approximately 80%.

Embodiment 5

The processing method is the same as Embodiment 1 except for the following conditions.

Melting furnace: melting point is 1100 ° C; the flux is quartzite added in an amount of 0.8% with respect to the total weight of the copper ore; the oxidizing agent is oxygen added in an amount of 90 Nm ³ O ₂ per ton of copper ore.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 200,000 tons of copper matte is produced, which contains 65% copper, and 780,000 tons of smelting slag are obtained, which contains 5% copper and 4.71% zinc; the copper smelter produces 228,000 tonnes of anode copper containing 98.0% copper and 0.1% sulfur; thereafter, the melting slag is treated with a PP (reductive evaporation and precipitation) furnace, the slag contains 0.6% copper and 0.49% zinc. The copper recovery for the entire system is approximately 95% and the zinc recovery is approximately 78%.

Embodiment 6

The processing method is the same as Embodiment 1 except for the following conditions.

Copper smelter: the flux is quartzite added in an amount of 20% with respect to the total mass of the first copper matte; the oxidizing agent is oxygen-enriched air having an oxygen volume content of 80%, added in an amount of 120 Nm ³ O ₂ per ton of the first copper matte; the spray gun is used to spray the oxidizing agent into the copper smelter while simultaneously spraying a water aerosol; while cold copper scrap is added to the copper smelter; the reducing agent is powdered coal; the copper smelting slag is tapped off before the reducing agent is sprayed; the copper smelting slag is cooled and returned to the smelting furnace.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte is produced, which contains 75% copper, and 650,000 tons of smelting slag is obtained, which contains 3% copper and 2.77% zinc; the copper smelter produces 246,000 tonnes of anode copper containing 99.5% copper and 0.03% sulfur; thereafter, the smelting slag is treated with a PP (reductive evaporation and precipitation) furnace, the slag contains 0.4% copper and 0.32% zinc. The copper recovery for the entire system is approximately 99.6% and the zinc recovery is approximately 80%.

Embodiment 7

The processing method is the same as Embodiment 1 except for the following conditions.

Copper smelter: the flux is quartzite added in an amount of 20% with respect to the total mass of the first copper matte; the oxidizing agent is oxygen-enriched air having an oxygen volume content of 30% added in an amount of 140 Nm ³ O ₂ per tonne of the first copper matte; the spray gun is used to spray the oxidizing agent into the copper smelter while simultaneously spraying a water aerosol; while cold copper scrap is added to the copper smelter; the reducing agent is powdered coal; the copper smelting slag is tapped off before the reducing agent is sprayed; the copper smelting slag is cooled and returned to the smelting furnace.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte is produced, which contains 75% copper, and 650,000 tons of smelting slag is obtained, which contains 3% copper and 2.77% zinc; the copper smelter produces 220,000 tons of anode copper containing 98.8% copper and 0.03% sulfur; thereafter, the melting slag is treated with a PP (reductive evaporation and deposition) furnace, the slag contains 0.5% copper and 0.34% zinc. The copper recovery for the entire system is approximately 98.7% and the zinc recovery is approximately 75%.

Embodiment 8

The processing method is the same as Embodiment 1 except for the following conditions.

Copper smelter: the flux is quartzite added in an amount of 20% with respect to the total mass of the first copper matte; the oxidizing agent is oxygen-enriched air having a volumetric oxygen content of 25% and added in an amount of 140 Nm ³ O ₂ per ton of the first copper matte; the reducing agent is powdered coal; no water spray is sprayed and no cold material is added.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte is produced, which contains 75% copper, and 650,000 tons of smelting slag is obtained, which contains 3% copper and 2.77% zinc; the copper smelter produces 182,000 tonnes of anode copper containing 97.6% copper and 0.12% sulfur; after the smelting slag is treated by reductive dilution (reductive evaporation and precipitation), the slag contains 0.41% copper and 0.50% zinc. The copper recovery for the entire system is approximately 95% and the zinc recovery is approximately 70%.

Embodiment 9

The processing method is the same as Embodiment 1 except for the following conditions.

Furnace PP: reduction evaporation and deposition are carried out sequentially; in the stage of reductive evaporation treatment, the reaction temperature is 1350 ° C; the reducing agent is powdered coal added in an amount of 10% with respect to the total mass of the smelting slag; a small amount of oxygen is introduced to provide heat; a vulcanizing agent (pyrite) is added to obtain a lean copper matte; sulfur dioxide gas is introduced into the settling chamber and the resulting lean copper matte is returned to the smelter.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte is produced, which contains 75% copper, and 650,000 tons of smelting slag is obtained, which contains 3% copper and 2.77% zinc; The copper smelter produces 235,000 tonnes of anode copper containing 99.3% copper and 0.05% sulfur; thereafter, the smelting slag is treated with a PP (reductive evaporation and precipitation) furnace, the slag contains 0.1% copper and 0.19% zinc. The copper recovery for the entire system is approximately 99% and the zinc recovery is approximately 85%.

Embodiment 10

The processing method is the same as Embodiment 1 except for the following conditions.

Furnace PP: deposition and reductive evaporation are carried out sequentially; in the stage of reductive evaporation treatment, the reaction temperature is 1350 ° C; the reducing agent is powdered coal added in an amount of 10% with respect to the total mass of the smelting slag; a small amount of oxygen is introduced to provide heat; the settling chamber heats the electrode.

Processing results: they process 1 million tons of copper concentrate per year, where copper concentrate contains 20% copper and 2% zinc; by smelting, 250,000 tons of copper matte are produced, which contains 72% copper, and 630,000 tons of smelting slag are obtained, which contains 3.5% copper and 2.63% zinc; the copper smelter produces 240,000 tons of anode copper containing 99.3% copper and 0.05% sulfur; thereafter, the melting slag is treated with a PP (reductive evaporation and deposition) furnace, the slag contains 0.6% copper and 0.54% zinc. The copper recovery for the entire system is approximately 98.5% and the zinc recovery is approximately 68%.

From the above description, it can be seen that the aforementioned embodiments of the present invention have achieved the following technical effects:

By using the copper smelting method according to the present invention, a large annual processing volume is achieved, a large production of anode copper (a copper product that can approach electrolytic anode copper in purity) is achieved, and a high recovery of valuable metals is obtained. Specifically, from the data of Embodiment 1 and Embodiments 5-8, it can be seen that in Embodiments 1 and 5, the mode of adding cold material and spraying water mist into the copper smelter is applied. Compared with the technical solution of Embodiment 8 in which no cold material is added or water mist is not sprayed into the copper smelter, in Embodiments 1 and 5, the oxygen content of the oxidant in the copper production reaction is significantly increased, and as a result, the copper production reaction can be carried out under conditions of high oxygen concentration in enriched air without generating excessive heating, and the copper sulfide recovery efficiency and the copper content of the anode copper are also effectively improved. Of course, although no cold material is added or water spray is sprayed into the copper smelter, the solution according to Embodiment 8 of the present invention also adopts an accelerated copper smelting process to efficiently recover valuable metals contained in the smelter slag, and directly produce anode copper and obtain harmless slag, which is also within the scope of the present invention.

In summary, the present invention can efficiently recover valuable metals in the smelter slag during the smelting process through reductive evaporation and precipitation, and as a result, resources are recycled and environmental pollution is reduced. In addition, according to the present invention, the smelting furnace is present as the base, and at the same time, the tapping and slag tapping times are shortened, thereby greatly simplifying the copper smelting process. It is estimated that the average zinc content in the slag is 3%, the processing rate is 80%, and a copper smelter with a capacity of 200,000 tons per year can extract 19,000 tons of zinc per year, which greatly improves the economic benefits of the enterprise, greatly simplifies the slag processing process, significantly reduces the footprint and also eliminates the potential risk of contamination from slag waste.

The above are only preferred embodiments of the present invention, not intended to limit the present invention. As understood by those skilled in the art, the present invention can be subject to a variety of modifications and variations. Any modifications, equivalent replacements, improvements and similar changes made within the framework of the ideas and principles of the present invention are within the protection scope of the present invention.

Claims (21)

1. A method of integrated processing of slag from copper smelting using a complete processing furnace (PP) for carrying out reductive evaporation and deposition of melting slag in order to comprehensively recover valuable metals contained in the melting slag and obtain a depleted slag, and the valuable metals include one or more metals from lead, zinc and antimony, the PP furnace includes a cavity, the cavity contains a reducing evaporation chamber and a settling chamber in communication with each other, while the stage of extracting valuable metals contained in the smelting slag includes: carrying out a reduction evaporation treatment of the melt slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and reduced slag, and carrying out a precipitation treatment of the reduced slag in a precipitation chamber to obtain copper matte and depleted slag, or carrying out precipitation treatment of smelting slag in a precipitation chamber to obtain copper matte and precipitated slag, and carrying out a reduction evaporation treatment of precipitated slag in a reduction evaporation chamber to obtain an aerosol of valuable metals and depleted slag, wherein the stage of reductive evaporation processing is carried out before the stage of precipitation treatment, a collector is added to the reduction evaporation chamber during reductive evaporation treatment, or the stage of reductive evaporation treatment is carried out after the stage of precipitation treatment, a second vulcanizing agent and / or copper concentrate is added to the precipitation chamber during the precipitation processing, while the stage of the precipitation treatment further includes blowing an inert gas and / or gaseous sulfur dioxide into the precipitation chamber. 2. The method according to claim 1, in which the dividing wall is additionally located in the cavity for dividing the cavity into a reducing evaporation chamber and a settling chamber, wherein the reducing evaporation chamber and the settling chamber are located on two sides of the dividing wall in the horizontal direction, and the connecting channel is the chamber and the settling chamber are located near the bottom of the cavity. 3. A method according to claim 1, wherein the step of reductive evaporation treatment comprises adding a reducing agent to a reduction evaporation chamber for a reductive evaporation treatment, the reducing agent being preferably selected from one or more materials of natural gas, coal gas, liquefied petroleum gas, iron powder and a solid carbon-based reductant, the solid carbon-based reductant being more preferably selected from one or more lump coal, powdered coal and coke materials. 4. The method of claim 3, wherein a side-blown atomizer is disposed in the reduction evaporation chamber, wherein the reductant is blown into the reduction evaporation chamber during the reductive evaporative treatment step by means of a side-blown atomizer. 5. The method of claim 4, wherein the reduction evaporation chamber is further equipped with a smoke outlet and the reduction evaporation treatment step further comprises introducing secondary air into the top of the reduction evaporation chamber or smoke outlet. 6. The method according to any one of claims. 1-5, in which the reaction temperature is 1200 to 1400 ° C in the evaporative reduction treatment step. 7. A method according to any one of claims. 1-5, wherein the manifold is selected from a first curing agent and / or copper concentrate, the first curing agent being selected from pyrite and / or chalcopyrite and the second curing agent being selected from one or more materials of pyrite, chalcopyrite and smelting slag lead and copper. 8. The method according to any one of claims. 1-5, in which the settling chamber is subjected to an insulating treatment during the settling treatment. 9. A device for the complex processing of slag from copper smelting, including a PP furnace (30) with a melting slag inlet, and the PP furnace (30) is configured to carry out reductive evaporation and precipitation of the melting slag to recover valuable metals contained in the melting slag and obtain depleted slag, and the furnace PP (30) includes a cavity, while the cavity contains a reducing evaporation chamber (31) and a settling chamber (32) in communication with each other, and: the reduction evaporation chamber (31) is configured to perform a reduction evaporation treatment of the melt slag, and the settling chamber (32) is configured to perform precipitation treatment of the reduced slag obtained after the reduction evaporation treatment, or the settling chamber (32) is configured to carry out the precipitation treatment of the smelting slag, and the reduction evaporation chamber (31) is configured to carry out the reduction evaporative treatment of the precipitated slag obtained after the precipitation treatment, the reduction evaporation chamber (31) further includes an atomizer located on the side of the reduction evaporation chamber (31) and configured to add a reductant to the reduction evaporation chamber (31), and a loading opening located at the top of the reduction evaporation chamber (31) and configured to add a manifold to the reduction evaporation chamber (31), the device additionally includes an inert gas supplying device for blowing an inert gas into the settling chamber (32) and / or a sulfur dioxide gas supplying device for blowing gaseous sulfur dioxide into the settling chamber (32). 10. The device according to claim. 9, in which the dividing wall (33) is additionally located in the cavity for dividing the cavity into a reducing evaporation chamber (31) and a settling chamber (32), wherein the reducing evaporation chamber (31) and a settling chamber (32), are located on both sides of the separation wall (33) in the horizontal direction, and the connecting channel of the reduction evaporation chamber (31) and the settling chamber (32) is located near the bottom of the cavity. 11. The device according to PP. 9 or 10, in which the settling chamber (32) further includes a heating device for insulating or heating the settling chamber (32). 12. The apparatus of claim 11, wherein the heating device is an immersion combustion nozzle or electrode. 13. The device according to PP. 9 or 10, in which the reduction evaporation chamber (31) is equipped with a steam outlet, and the settling chamber (32) is equipped with a copper matte outlet and a depleted slag outlet, or the settling chamber (32) is equipped with a copper matte outlet and the reduction evaporation chamber (31 ) equipped with a steam outlet and a depleted slag outlet.

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