CN212316202U - Zinc-containing dust recovery system - Google Patents
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- CN212316202U CN212316202U CN202021262739.7U CN202021262739U CN212316202U CN 212316202 U CN212316202 U CN 212316202U CN 202021262739 U CN202021262739 U CN 202021262739U CN 212316202 U CN212316202 U CN 212316202U
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Abstract
The utility model provides a recovery system of zinciferous dust. This recovery system includes: the electric furnace is provided with a first smoke outlet; the secondary combustion chamber is connected with the first flue gas outlet so as to carry out secondary combustion on the zinc-containing flue gas from the electric furnace to obtain secondary zinc oxide-containing flue gas; the cooling device is connected with the secondary combustion chamber and is used for cooling the secondary zinc oxide-containing flue gas generated by the secondary combustion chamber; and the dust collection device is connected with the cooling device and is used for carrying out dust collection treatment on the smoke containing the secondary zinc oxide after being cooled by the cooling device. By applying the recovery system, the raw materials do not need pretreatment such as sintering and the like, the flow is short, the equipment investment is low, and the environment is friendly; the zinc-containing dust is matched with the steel slag for treatment, zinc is recovered, iron resources are recycled, the internal circulation of an iron resource plant is realized, and the steel slag is used as a solvent, so that no additional solvent is required to be added in smelting, and the slag amount and the cost are effectively controlled.
Description
Technical Field
The utility model relates to a steel production technical field particularly, relates to a recovery system of zinciferous dust.
Background
With the development of the steel industry in China, the influence of dust generated in the steel production process on the environment is increasingly prominent. Generally, the dust amount of iron and steel enterprises is 8 wt% to 12 wt% of steel production. The annual dust yield of steel enterprises in China reaches tens of millions of tons, and the dust contains a large amount of iron elements and also contains carbon, zinc, lead, potassium and other elements.
In general, steel enterprises collect these dusts and use them as sintering materials to recycle them inside the enterprises. Since these dusts have a fine particle size and a large specific surface area, the incorporation of the sintering material into these dusts reduces the air permeability of the sinter bed. In addition, because the dust contains elements such as zinc, lead, potassium, sodium and the like, the formed sinter ore can cause the cyclic enrichment of zinc, lead, potassium and sodium of the blast furnace when used in the blast furnace, so that the blast furnace wall is nodulated, and the smooth production of the blast furnace is influenced.
At present, the zinc-containing dust treatment process of steel plants is more, the zinc-containing dust is treated by adopting a rotary kiln, a rotary hearth furnace, a shaft furnace and the like, and oxides of metal zinc are reduced at high temperature by utilizing the characteristic of low boiling point of the metal zinc and are volatilized in a steam form to enter a flue gas recovery system, and finally, the oxides are recovered in a zinc oxide or metal zinc form, so that the effective separation from a solid phase main body is realized, but the processes have the unsolved problems:
the Wilz process: the mixed pellets or dust are treated by adopting a long rotary kiln, if zinc in the dust needs to be recovered, a two-section rotary kiln is adopted, zinc-containing steam enters a second rotary kiln for retreatment, and the main defects of the Wilz process are as follows: the equipment is huge, the volume utilization rate in the kiln is low, the energy consumption is high, the ring formation is easy, the requirement on the strength of materials entering the kiln is high, a binder needs to be prepared for mixing and pelletizing, and the coal consumption is large.
The rotary hearth furnace process comprises the following steps: the zinc-containing dust and dust mud are crushed, dried, agglomerated and put into a rotary hearth furnace for high-temperature reduction, and zinc steam is volatilized and enters flue gas. The main problems of the rotary hearth furnace for treating the zinc-containing dust are that the equipment occupies a large area, the smoke exhaust temperature is high, the heat efficiency is low, and meanwhile, the problem of unsmooth production caused by blockage of a smoke exhaust channel due to condensation of zinc steam exists, and the produced direct reduced iron is an intermediate product and needs to be further smelted.
The Oxycup dust treatment process comprises the following steps: the Oxycup shaft furnace adopts an internal coal blending briquette, cement is required to be used as a binder for ensuring enough strength, and the shaft furnace has the advantages of high heat efficiency, full reduction of metal oxides and high metal yield; the disadvantages are that the pretreatment of the material is complex, the binder needs to be prepared and the coal briquette needs to be sintered to ensure enough strength, the coke ratio is high (3 times of that of common blast furnace ironmaking), the utilization coefficient is low, and the impurity element content of the molten iron is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a recovery system of zinciferous dust to solve among the prior art material preliminary treatment complicated, the equipment is huge, the uneconomical problem of recovery of zinc and iron.
In order to achieve the above object, according to an aspect of the present invention, there is provided a recovery system of zinc-containing dust, the recovery system comprising: the electric furnace is provided with a first smoke outlet; the secondary combustion chamber is connected with the first flue gas outlet so as to carry out secondary combustion on the zinc-containing flue gas from the electric furnace to obtain secondary zinc oxide-containing flue gas; the cooling device is connected with the secondary combustion chamber and is used for cooling the secondary zinc oxide-containing flue gas generated by the secondary combustion chamber; and the dust collection device is connected with the cooling device and is used for carrying out dust collection treatment on the smoke containing the secondary zinc oxide after being cooled by the cooling device.
Further, the electric furnace is a direct current electric furnace.
Further, the dc electric furnace is a sealed circular dc electric furnace.
Further, the electrode of the electric furnace is a hollow self-baking electrode.
Further, the electric furnace is provided with a first charging hole and a second charging hole, and the recovery system comprises a steel slag supply device which is connected with the first charging hole and is used for supplying steel slag to the electric furnace; a zinc-containing dust supply device connected to the electrode to supply zinc-containing dust to the electric furnace through the electrode; and a coke supply device connected with the second charging port and used for supplying coke to the electric furnace.
Further, the cooling device is a waste heat recovery boiler, the waste heat recovery boiler is provided with a smoke inlet and a steam outlet, the smoke inlet is connected with the first smoke outlet, and the steam outlet is connected with the steam power generation device.
Further, the dust collecting device is a bag dust collector.
By applying the technical scheme of the utility model, the steel slag, the zinc-containing dust and the coke are directly added into the electric furnace for reduction smelting, the raw materials do not need pretreatment such as sintering and the like, the flow is short, the equipment investment is low, and the environment is friendly; in addition, the zinc-containing dust is matched with the steel slag for treatment, so that the recycling of iron resources is realized while zinc is recovered, the in-plant circulation of the iron resources is realized, and the steel slag can be used as a solvent at the same time, so that no additional solvent is required to be added in the smelting process, and the slag amount and the raw material cost are effectively controlled.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
figure 1 shows a schematic view of a zinc-containing dust recovery process according to an embodiment of the present invention;
fig. 2 shows a block diagram of a recycling system for zinc-containing dust according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
1. an electric furnace; 2. a secondary combustion chamber; 3. a cooling device; 4. a dust collecting device; 5. a steel slag supply device; 6. a zinc-containing dust supply device; 7. a coke supply device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As analyzed by the background art, although the prior art has more zinc-containing dust treatment processes in steel plants, the prior processes have the defects of complicated material pretreatment, huge equipment, uneconomical zinc and iron recovery and the like, and in order to make up for the defects, the application provides a zinc-containing dust recovery system.
In an exemplary embodiment of the present application, there is provided a zinc-containing dust recycling system, as shown in fig. 2, including: the electric furnace 1, the secondary combustion chamber 2, the cooling device 3 and the dust collecting device 4, wherein the steel slag, the zinc-containing dust and the coke are subjected to reduction smelting in the electric furnace 1 to obtain slag, molten iron and zinc-containing flue gas, and the electric furnace 1 is provided with a first flue gas outlet; the secondary combustion chamber 2 is connected with the first flue gas outlet so as to carry out secondary combustion on the zinc-containing flue gas from the electric furnace 1 to obtain secondary zinc oxide-containing flue gas; the cooling device 3 is connected with the secondary combustion chamber 2 and is used for cooling the secondary zinc oxide-containing flue gas generated by the secondary combustion chamber 2; the dust collecting device 4 is connected with the cooling device 3 and is used for carrying out dust collection treatment on the smoke containing the secondary zinc oxide after being cooled by the cooling device 3.
By utilizing the recovery system of the zinc-containing dust, the steel slag, the zinc-containing dust and the coke are directly added into an electric furnace for reduction smelting, the raw materials do not need pretreatment such as sintering and the like, the flow is short, the equipment investment is low, and the environment is friendly; in addition, the zinc-containing dust is matched with the steel slag for treatment, so that the recycling of iron resources is realized while zinc is recovered, the in-plant circulation of the iron resources is realized, and the steel slag can be used as a solvent at the same time, so that no additional solvent is required to be added in the smelting process, and the slag amount and the raw material cost are effectively controlled.
In the recovery system of zinc containing dust of the present application, any electric furnace known in the art can be used. Compared with a fuel furnace, the electric furnace has the following advantages: the atmosphere in the furnace is easy to control; the material is heated quickly; the heating temperature is high; the temperature is easy to control; the production process is easy to realize mechanization and automation; the labor sanitary condition is good; the thermal efficiency is high; the product has good quality and is more environment-friendly, and is beneficial to relieving the increasingly serious environmental problems. For convenience of operation and cost saving, the electric furnace is preferably a dc electric furnace, more preferably a sealed circular dc electric furnace, and the electrode of the electric furnace is preferably a hollow self-baking electrode.
In a preferred embodiment of the present application, the electric furnace 1 has a first charging port and a second charging port, and as shown in fig. 2, the above-mentioned recycling system includes a steel slag supply device 5, a zinc-containing dust supply device 6, and a coke supply device 7, the steel slag supply device 5 is connected to the first charging port for supplying steel slag to the electric furnace 1; a zinc-containing dust supply device 6 connected to the electrode to supply zinc-containing dust to the electric furnace 1 through the electrode; a coke supply 7 is connected to the second charging port for supplying coke to the electric furnace 1. Through linking to each other slag supply device 5 and coke supply device 7 with the charge door of electric stove 1, slag supply device 5 can be for the sediment package, links to each other zinciferous dust supply device 6 with the electrode, directly adds into electric stove 1 with slag and coke by the charge door of electric stove 1 and with zinciferous dust by the electrode in adding electric stove 1, can shorten the recovery flow, avoids preliminary treatment such as raw materials sintering to practice thrift the cost.
In the recovery system of the zinc-containing dust of this application, can use any device that can play the cooling effect to cool off the secondary zinc oxide-containing flue gas that the secondary combustion chamber produced. For the sake of simple operation and convenient steam recovery, the cooling device 3 is preferably a waste heat recovery boiler, the waste heat recovery boiler is provided with a flue gas inlet and a steam outlet, the flue gas inlet is connected with the first flue gas outlet, and the steam outlet is connected with the steam power generation device.
In the recovery system of zinc-containing dust of the present application, any device capable of collecting dust may be used. For ease of operation and ready availability, the dust collecting apparatus 4 is preferably a bag collector.
In order to enable the person skilled in the art to better implement the above-described zinc dust recovery system. In another exemplary embodiment of the present application, there is provided a zinc dust recovery method, including: step S1, carrying out reduction smelting on the steel slag, the zinc-containing dust and the coke in an electric furnace to obtain slag, molten iron and zinc-containing flue gas; step S2, carrying out secondary combustion on the zinc-containing flue gas to obtain secondary zinc oxide-containing flue gas; and step S3, cooling and collecting dust of the smoke containing the secondary zinc oxide to obtain the smoke containing the secondary zinc oxide.
The steel slag, the zinc-containing dust and the coke are directly added into the electric furnace for reduction smelting, the raw materials do not need pretreatment such as sintering and the like, the flow is short, the electric furnace occupies a small area, the equipment investment is low, and the environment is friendly; in addition, the zinc-containing dust is matched with the steel slag for treatment, so that the recycling of iron resources is realized while zinc is recovered, the in-plant circulation of the iron resources is realized, and the steel slag can be used as a solvent at the same time, so that no additional solvent is required to be added in the smelting process, and the slag amount and the raw material cost are effectively controlled.
In order to improve the efficiency of the recovery method of the zinc-containing dust, effectively recover zinc and iron in the steel slag and the zinc-containing dust and save the cost of raw materials, the weight ratio of the steel slag, the zinc-containing dust and coke is preferably 10-15: 35-45: 1.
in the recovery method of zinc-containing dust, any steel slag and zinc-containing dust produced in the steel production process can be adopted. In order to further shorten the recovery process, avoid pretreatment such as raw material sintering and the like and save the cost, the steel slag is preferably molten steel slag; preferably, the zinc-containing dust is selected from one or more of electric furnace steel-making zinc-containing ash, iron-making blast furnace zinc-containing ash and sintering zinc-containing ash.
In the zinc dust-containing recovery process of the present application, any electric furnace known in the art may be used. Compared with a fuel furnace, the electric furnace has the following advantages: the atmosphere in the furnace is easy to control; the material is heated quickly; the heating temperature is high; the temperature is easy to control; the production process is easy to realize mechanization and automation; the labor sanitary condition is good; the thermal efficiency is high; the product has good quality and is more environment-friendly, and is beneficial to relieving the increasingly serious environmental problems. For convenience of operation and cost saving, the electric furnace is preferably a direct current electric furnace, such as a closed circular direct current electric furnace, the electrode of the electric furnace is preferably a hollow self-baking electrode, and the zinc-containing dust can be directly sprayed into a molten pool from the hollow electrode without granulation, so that the process flow is shortened.
In the zinc dust-containing recovery method of the present application, preferably, the step S1 includes: respectively adding the steel slag and the coke into an electric furnace, and adding zinc-containing dust into the electric furnace through an electrode; and heating the electric furnace to 1500-1600 ℃ for reduction smelting. Through directly adding slag and coke in the electric furnace from the electric furnace charge door and adding zinc-containing dust in the electric furnace from the electrode, can shorten the recovery flow, avoid pretreatment such as dust raw materials sintering to practice thrift the cost. If zinc-containing dust in a steel mill is recovered, the steel slag can be directly poured into the electric furnace from a slag ladle. In addition, the electric furnace is heated to 1500-1600 ℃, so that the energy consumption can be saved while the raw materials are fully smelted, the smelting efficiency can be better guaranteed, and the cost can be optimally saved.
In the recovery method of zinc-containing dust, preferably, after the reduction smelting, the discharged slag temperature is 1450-1550 ℃, the discharged molten iron temperature is 1350-1450 ℃, and the temperature of the zinc-containing flue gas is 1250-1350 ℃. By keeping the temperature of the slag and the temperature of the molten iron higher, the zinc-containing flue gas can be better separated from the slag and the molten iron, thereby further ensuring the control requirement that the zinc steam is discharged along with the coal gas in a large amount.
In the recovery method of zinc-containing dust, in order to fully perform reduction smelting and save energy, the reduction smelting is preferably performed for 4-6 hours.
In the recovery method of zinc-containing dust, the temperature of the secondary combustion is preferably 1500-1600 ℃, and the volume fraction of CO in the zinc-containing flue gas is preferably 70-80%. In the temperature range, the time range and the volume range, the zinc in the zinc-containing dust can be ensured to be more fully reacted and converted into the zinc hypoxide.
The advantageous effects of the present application will be further described below with reference to examples and comparative examples.
Examples
Example 1
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 20 wt%;
2. 5.2t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 15t of zinc-containing dust is added into the electric furnace through a hollow electrode, 0.4t of coke is added into the electric furnace through a charging hole, and the weight ratio of the three materials is 13:37.5: 1.
3. Heating an electric furnace to 1550 ℃, after reduction smelting for 4h, discharging 8.1t of molten slag and 6.6t of molten iron (the iron content is 90 wt%), feeding 1300 ℃ zinc-containing flue gas into a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (by volume percentage):
| CO | N2 | H2O | SO2 |
| 76.71 | 21.89 | 0.90 | 0.49 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.4t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 42.5 wt% of Zn in terms of Zn.
The above process can refer to fig. 1, wherein the steam obtained by the waste heat recovered by the waste heat boiler can be used for steam power generation, and the flue gas collected by the bag dust collector is desulfurized and then is exhausted.
Example 2
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 22 wt%;
2. 5.6t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 16t of zinc-containing dust is added into the electric furnace through a hollow electrode, 0.4t of coke is added into the electric furnace through a charging hole, and the weight ratio of the three is 14:40: 1.
3. Heating an electric furnace to 1550 ℃, after 5h of reduction smelting, discharging 9.0t of molten slag and 6.9t of molten iron (the iron content is 92 wt%), and enabling 1300 ℃ zinc-containing flue gas to enter a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (in percentage by volume):
| CO | N2 | H2O | SO2 |
| 72.25 | 20.80 | 0.91 | 0.48 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler and enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.5t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 42 wt% of Zn in terms of Zn.
Example 3
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 21.5 wt%;
2. 6t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 18t of zinc-containing dust is added into the electric furnace through a hollow electrode, 0.5t of coke is added into the electric furnace through a charging hole, and the weight ratio of the three materials is 12:36: 1.
3. Heating an electric furnace to 1550 ℃, after 6h of reduction smelting, discharging 9.8t of molten slag and 7.8t of molten iron (the iron content is 92.5 wt%), and enabling 1300 ℃ zinc-containing flue gas to enter a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (by volume percentage):
| CO | N2 | H2O | SO2 |
| 78.62 | 24.01 | 0.88 | 0.52 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.6t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 43.2% of Zn in terms of Zn.
Example 4
The zinc containing dust recovery scheme was the same as in example 1 except that the weight ratio of the molten steel slag, the zinc containing dust and the coke was 10:35: 1.
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 20 wt%;
2. 4t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 14t of zinc-containing dust is added into the electric furnace through a hollow electrode, and 0.4t of coke is added into the electric furnace through a charging hole.
3. Heating an electric furnace to 1550 ℃, after reduction smelting for 4h, discharging 7.2t of molten slag and 5.8t of molten iron (the iron content is 90 wt%), feeding 1300 ℃ zinc-containing flue gas into a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (by volume percentage):
| CO | N2 | H2O | SO2 |
| 74.35 | 22.15 | 1.01 | 0.52 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.45t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 40.4 wt% of Zn in terms of Zn.
Example 5
The zinc containing dust recovery scheme was the same as in example 1 except that the weight ratio of molten steel slag, zinc containing dust and coke was 15:45: 1.
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 20 wt%;
2. 5.25t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 15.75t of zinc-containing dust is added into the electric furnace through a hollow electrode, and 0.35t of coke is added into the electric furnace through a feed inlet.
3. Heating an electric furnace to 1550 ℃, after reduction smelting for 4h, discharging 8.4t of molten slag and 6.82t of molten iron (the iron content is 88.5 wt%), feeding 1300 ℃ zinc-containing flue gas into a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (by volume percentage):
| CO | N2 | H2O | SO2 |
| 71.38 | 23.56 | 0.49 | 0.59 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.53t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 39.4 wt% of Zn in terms of Zn.
Example 6
The zinc-containing dust recovery flow was the same as in example 1 except that the electric furnace was heated to 1500 ℃ and reduction smelting was carried out for 4 hours.
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 20 wt%;
2. 5.2t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 15t of zinc-containing dust is added into the electric furnace through a hollow electrode, 0.4t of coke is added into the electric furnace through a charging hole, and the weight ratio of the three materials is 13:37.5: 1.
3. Heating an electric furnace to 1500 ℃, after 4h of reduction smelting, discharging 8.1t of molten slag and 6.5t of molten iron (the iron content is 90.5 wt%), feeding the 1300 ℃ zinc-containing flue gas into a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (volume percentage content)
| CO | N2 | H2O | SO2 |
| 75.37 | 22.45 | 0.95 | 0.46 |
4. The zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.4t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 40 wt% of Zn in terms of Zn.
Example 7
The zinc-containing dust recovery flow was the same as in example 1 except that the electric furnace was heated to 1600 ℃ and reduction smelting was carried out for 4 hours.
1. Recovering zinc-containing dust from a steel plant and drying to obtain zinc-containing dust with a zinc content of 20 wt%;
2. 5.2t of molten steel slag is transferred from a slag ladle and poured into a 20MVA direct current electric furnace, 15t of zinc-containing dust is added into the electric furnace through a hollow electrode, 0.4t of coke is added into the electric furnace through a charging hole, and the weight ratio of the three materials is 13:37.5: 1.
3. Heating an electric furnace to 1600 ℃, after 4h of reduction smelting, discharging 8.0t of molten slag and 6.6t of molten iron (the iron content is 95 wt%), feeding 1300 ℃ zinc-containing flue gas into a secondary combustion chamber for combustion, wherein the zinc-containing flue gas comprises the following components (by volume percentage):
| CO | N2 | H2O | SO2 |
| 77.12 | 20.15 | 0.840 | 0.58 |
4. the zinc-containing flue gas is fully combusted in a secondary combustion chamber to obtain secondary zinc oxide-containing flue gas, the temperature is 1600 ℃, the time is 2s, the flue gas is cooled to 200 ℃ by waste heat recovered by a waste heat recovery boiler, and then the flue gas enters a bag dust collector;
5. the smoke dust amount after dust collection by the bag dust collector is 0.4t, and the smoke dust contains zinc hypoxide, wherein the smoke dust contains 43 wt% of Zn in terms of Zn.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
the steel slag, the zinc-containing dust and the coke are directly added into an electric furnace for reduction smelting, the raw materials are directly added into the furnace without pretreatment, the process is short, the equipment investment is low, and the environment is friendly; in addition, the zinc-containing dust is matched with the steel slag for treatment, so that the recycling of iron resources is realized while zinc is recovered, the in-plant circulation of the iron resources is realized, and the steel slag can be used as a solvent at the same time, so that no additional solvent is required to be added in the smelting process, and the slag amount and the raw material cost are effectively controlled.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A recycling system for zinc containing dust, characterized in that the recycling system comprises:
the electric furnace (1), the steel slag, the zinc-containing dust and the coke are subjected to reduction smelting in the electric furnace (1) to obtain slag, molten iron and zinc-containing flue gas, and the electric furnace (1) is provided with a first flue gas outlet;
the secondary combustion chamber (2) is connected with the first flue gas outlet so as to carry out secondary combustion on the zinc-containing flue gas from the electric furnace (1) to obtain secondary zinc oxide-containing flue gas;
the cooling device (3) is connected with the secondary combustion chamber (2) and is used for cooling the secondary zinc oxide-containing flue gas generated by the secondary combustion chamber (2);
and the dust collection device (4) is connected with the cooling device (3) and is used for carrying out dust collection treatment on the smoke containing the secondary zinc oxide after being cooled by the cooling device.
2. A recycling system according to claim 1, characterized in that the electric furnace (1) is a direct current electric furnace.
3. A recycling system according to claim 2, characterized in that the dc furnace is a closed circular dc furnace.
4. A recycling system according to claim 2, characterized in that the electrodes of the electric furnace (1) are hollow self-baking electrodes.
5. A recycling system according to claim 4, characterized in that the electric furnace (1) has a first and a second charging opening, the recycling system comprising
The steel slag supply device (5) is connected with the first charging opening and is used for supplying steel slag to the electric furnace (1);
a zinc containing dust supply device (6) connected to the electrode to supply zinc containing dust to the electric furnace (1) through the electrode;
a coke supply device (7) connected with the second charging port and used for supplying coke to the electric furnace (1).
6. A recovery system according to any of claims 1 to 5, characterized in that the cooling device (3) is a heat recovery boiler having a flue gas inlet connected to the first flue gas outlet and a steam outlet connected to a steam power plant.
7. A recovery system according to claim 1, characterized in that the dust collecting device (4) is a bag house.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021262739.7U CN212316202U (en) | 2020-07-01 | 2020-07-01 | Zinc-containing dust recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021262739.7U CN212316202U (en) | 2020-07-01 | 2020-07-01 | Zinc-containing dust recovery system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111607707A (en) * | 2020-07-01 | 2020-09-01 | 中国恩菲工程技术有限公司 | Zinc-containing dust recovery method and zinc-containing dust recovery system |
| CN113652557A (en) * | 2021-07-31 | 2021-11-16 | 中国恩菲工程技术有限公司 | Zinc-containing solid waste treatment method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111607707A (en) * | 2020-07-01 | 2020-09-01 | 中国恩菲工程技术有限公司 | Zinc-containing dust recovery method and zinc-containing dust recovery system |
| CN113652557A (en) * | 2021-07-31 | 2021-11-16 | 中国恩菲工程技术有限公司 | Zinc-containing solid waste treatment method and system |
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