CN220643224U - Extracting device for valuable metals in zinc-containing dust - Google Patents
Extracting device for valuable metals in zinc-containing dust Download PDFInfo
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- CN220643224U CN220643224U CN202322032271.2U CN202322032271U CN220643224U CN 220643224 U CN220643224 U CN 220643224U CN 202322032271 U CN202322032271 U CN 202322032271U CN 220643224 U CN220643224 U CN 220643224U
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- regenerator
- containing dust
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000011701 zinc Substances 0.000 title claims abstract description 57
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 57
- 239000000428 dust Substances 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 title claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- 150000002739 metals Chemical class 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000005338 heat storage Methods 0.000 claims description 35
- 238000003860 storage Methods 0.000 claims description 16
- 230000001172 regenerating effect Effects 0.000 claims description 14
- 239000008188 pellet Substances 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 104
- 238000006722 reduction reaction Methods 0.000 abstract description 19
- 230000009467 reduction Effects 0.000 abstract description 16
- 238000002347 injection Methods 0.000 abstract description 11
- 239000007924 injection Substances 0.000 abstract description 11
- 239000007787 solid Substances 0.000 abstract description 9
- 238000009833 condensation Methods 0.000 abstract description 8
- 230000005494 condensation Effects 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 239000012159 carrier gas Substances 0.000 abstract description 4
- 230000001603 reducing effect Effects 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 239000000779 smoke Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000007859 condensation product Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model discloses an extraction device of valuable metals in zinc-containing dust, which comprises a heat accumulating type heating furnace, wherein a heat accumulating chamber is arranged in the heat accumulating furnace and is communicated with a heat accumulating tank; the tubular furnace is arranged in the regenerator, zinc-containing dust of the iron and steel plant is added in the tubular furnace, the top of the tubular furnace is provided with a gas output end, and the bottom of the tubular furnace is provided with a gas input end communicated with gas supply equipment and used as a place for gas-solid coupling reduction reaction between a reduction component in the gas and the zinc-containing dust of the iron and steel plant; the input end of the condenser is connected with the top gas output end of the tube furnace, and the output end is communicated with the gas input end of the exhaust fan through a pipeline and is used for sucking the exhaust fan to flow to volatile gaseous zinc steam in the condenser for condensation. According to the utility model, a gas-air dual-injection system is adopted, and zinc steam is wrapped and clamped to the condenser by taking gas as carrier gas while heating the tubular furnace, so that the volatilization rate of the zinc steam from the furnace is enhanced, and the yield of valuable metals is improved.
Description
Technical Field
The utility model relates to the technical field of zinc-containing dust recovery in steel plants, in particular to an extraction device for valuable metals in zinc-containing dust.
Background
The yield of the solid waste in the steel industry is about 10% of the steel yield, and the annual solid waste discharge of steel production enterprises in China exceeds 8000 ten thousand tons, but the comprehensive utilization rate of the solid waste is always low.
The zinc dust has high iron content, contains various valuable metals, and has high potential utilization value. Zinc-containing dust can be classified into raw material plant dust, electric furnace dust, blast furnace gas dust, sintering dust, steelmaking dust, and the like according to different production processes. At present, zinc-containing dust is treated by recycling valuable metals in the dust and then returning the valuable metals to an iron-making system for utilization.
Patent numbers CN201110444928.5 and CN201210369145.X propose a pyrogenic process for extracting zinc using rotary kiln equipment by reducing coal, zinc-containing waste and blast furnace gas ash (sludge) blending to obtain zinc powder. However, the zinc oxide powder of the process has low yield and complex process flow, and the aim of enriching the simple substance metal cannot be fulfilled. Patent No. 201410330341.5 proposes a method for pyrogenically reducing zinc element in a shaft furnace plant, which comprises mixing iron-zinc-containing dust, binder and coal dust to form balls. However, this process flow has a slow diffusion rate of zinc vapor due to zinc powder collection by means of zinc vapor dissipation itself, resulting in a low metal collection rate. The patent number CN 209210897U proposes a process for extracting zinc by utilizing a vacuum heat accumulating furnace, zinc dust is reduced and evaporated by a vacuum carbothermic reduction process, and a higher recovery rate is obtained, but because vacuum conditions are required for reduction, the operation conditions of equipment are severe, and reduced zinc steam can be condensed in the outward diffusion process, so that the top overflow condition is caused, and potential safety hazards exist.
In conclusion, the efficient, stable and environment-friendly recovery device for valuable metals in the smoke dust of the steel plant is designed, and has positive significance for improving the recycling utilization efficiency of wastes in the steel plant and realizing green low-carbon production.
Disclosure of Invention
The utility model provides an extraction device of valuable metals in zinc-containing dust in a steel plant, and aims to enhance the volatilization rate of zinc steam from the interior of a furnace and improve the yield of the valuable metals by adopting a gas-air double-injection system and by arranging an air heat storage system and a gas injection system and using gas as carrier gas while heating a tubular furnace.
The utility model provides an extraction device of valuable metals in zinc-containing dust, which is used for recovering the valuable metals in the zinc-containing dust of a steel plant, and comprises the following components: the device comprises a heat accumulating type heating furnace, a tube furnace, a heat accumulating chamber, gas supply equipment, a condenser and an exhaust fan, wherein:
the regenerative heating furnace is internally provided with a regenerative chamber which is communicated with the regenerative tank;
the tubular furnace is arranged in the regenerator, zinc-containing dust of the iron and steel plant is added in the tubular furnace, the top of the tubular furnace is provided with a gas output end, and the bottom of the tubular furnace is provided with a gas input end communicated with gas supply equipment and used as a place for gas-solid coupling reduction reaction between a reduction component in the gas and the zinc-containing dust of the iron and steel plant fed into the interior of the tubular furnace;
the input end of the condenser is connected with the top gas output end of the tube furnace, and the output end is communicated with the gas input end of the exhaust fan through a pipeline and is used for sucking the exhaust fan to flow to volatile gaseous zinc steam in the condenser for condensation.
Preferably, the regenerator comprises a first regenerator and a second regenerator, the first regenerator and the second regenerator are both communicated with the heat storage tank, the first regenerator is arranged above the second regenerator, the first regenerator and the second regenerator are of annular structures, and the tubular furnace is arranged inside the first regenerator and the second regenerator.
Preferably, the output end of the exhaust fan is connected with a gas storage tank, and the gas storage tank is used for sending CO-rich gas generated by the reaction into the gas storage tank to realize operation pressure stabilization.
Preferably, the output end of the gas storage tank is communicated with the regenerator, and is used for sending the gas rich in CO into the regenerator to be combusted and utilized again.
Preferably, the regenerator is further connected with an exhaust gas discharge tower through a pipeline, and the exhaust gas discharge tower is used for delivering the gas after the combustion and the reuse of the regenerator to the exhaust gas discharge tower for discharge.
Preferably, the openings of the gas input end and the gas output end of the tube furnace are circular ， And the circle centers are all positioned on the vertical central line of the tube furnace, and the radius of the opening is 1/7-1/5 of the radius of the tube furnace.
Preferably, the top gas output end of the tube furnace is connected with the input end of the condenser through a pipeline, and a filter screen is arranged in the pipeline and is used for removing dust in gas flue gas.
Preferably, the diameter of the filter screen is the same as the diameter of the inlet of the condensing chamber in the condenser, so as to comprehensively filter the smoke dust sent into the condensing chamber by the tube furnace.
Preferably, when the condenser is arranged outside the tube furnace, the vertical central line of the filter screen forms an included angle of 90 degrees with the horizontal, and when the condenser is arranged inside the tube furnace, the vertical central line of the filter screen forms an included angle of 70 degrees to 80 degrees with the horizontal.
Preferably, the bottom of the tubular furnace is obliquely communicated with a conveying pipe for conveying metallized pellets of chemical reaction products of the tubular furnace, the high end of the conveying pipe is communicated with the inner cavity of the tubular furnace, the low end of the conveying pipe penetrates out of the regenerative heating furnace, and the penetrating-out end of the conveying pipe is communicated with a metallized pellet collecting barrel positioned outside the regenerative heating furnace.
Compared with the prior art, the utility model has the beneficial effects that:
the device for extracting valuable metals from zinc-containing dust in a steel plant adopts a coal gas-air double-injection system, and is respectively provided with an air heat storage system, a coal gas injection system and a related smoke exhaust system.
The gas in the gas storage tank in the gas supply equipment is blown into the tubular furnace from the bottom of the tubular furnace by a blower, on one hand, the volatile gaseous metal gas in the flue gas of the tubular furnace is guided into a condenser from bottom to top under the action of an exhaust fan, so that the dynamic conditions in the tubular furnace (a material reduction zone of the tubular furnace) are improved, and the volatilization speed of zinc steam is enhanced; on the other hand, the reducing gas component in the gas can also serve as a part of reducing agent to reduce oxides in the raw materials together with the reducing agent in the tube furnace, so that the effect of gas-solid coupling reduction is realized. When the flue gas is led to the condenser by the gas, the filter screen at the inlet of the condenser filters the smoke dust, and gaseous metal is condensed into solid metal in the condenser, so that the recovery of volatile valuable metal is realized. The majority of the gas after drainage and reduction is CO gas, and the CO gas is sent into the annular heat accumulation chamber by the exhaust fan for re-combustion and utilization, and the waste gas is discharged at the other side. The gas used for injection can be reducing gas generated in the working procedures of steel plants such as blast furnace gas, converter gas, coke oven gas and the like.
The device can well recover valuable metals in zinc-containing dust in steel plants, is suitable for various fuels, has low loss, adopts a reducing gas injection technology, enhances the reducing effect by gas-solid coupling reduction, enhances the gas diffusion dynamics condition in the reducing device, simultaneously re-combusts and utilizes the drained gas, and remarkably improves the yield of valuable metals.
Drawings
FIG. 1 is a schematic diagram of an apparatus for extracting valuable metals (external condenser) from zinc-containing dust in a steel plant according to the present utility model;
fig. 2 is a schematic diagram of an apparatus for extracting valuable metals (built-in condenser) from zinc-containing dust in a steel plant according to the present utility model.
Reference numerals illustrate:
1. the heat accumulating type heating furnace, the tubular furnace, the filter screen, the condenser, the exhaust fan and the first heat accumulating chamber are respectively arranged in the furnace body, the filter screen, the condenser, the exhaust fan and the first heat accumulating chamber, wherein the first heat accumulating chamber is provided with a first heat accumulating chamber, a second heat accumulating chamber, a third heat accumulating chamber, a fourth heat accumulating chamber, a fifth; 6.2. a second regenerator 7 and an exhaust gas discharge tower; 8. metallized pellet collecting barrels; 9. a gas storage tank; 10. a gas storage tank; 11. an air heat storage tank; 12. a blower; 13. a heat accumulating type heating furnace bracket.
Detailed Description
The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples
In order to design a high-efficiency, stable and environment-friendly recovery device for valuable metals in dust of a steel plant, and achieve the purpose of green low-carbon production by improving the recycling efficiency of wastes of the steel plant, as shown in fig. 1, the utility model provides an extraction device for valuable metals in zinc-containing dust, which is used for recovering valuable metals in zinc-containing dust of the steel plant, and is characterized by comprising the following components: a regenerative heating furnace 1, a tube furnace 2, a regenerative chamber, gas supply equipment, a condenser 4 and an exhaust fan 5, wherein:
a heat accumulation chamber is arranged in the heat accumulation type heating furnace 1 and is communicated with a heat accumulation tank; the air stored in the heat storage tank is sprayed to the heat storage chamber, fuel in the heat storage chamber is ignited to generate a large amount of heat, the heat generated by burning the fuel in the heat storage chamber heats the tubular furnace 2 to provide a heat source for the zinc-containing dust of the iron and steel plant in the tubular furnace 2 to carry out chemical reaction, and the bottom of the heat storage type heating furnace 1 is supported by the heat storage type heating furnace bracket 12;
the tubular furnace 2 is arranged in the regenerator, zinc-containing dust of the iron and steel plant is added in the tubular furnace 2, a gas output end is arranged at the top of the tubular furnace 2, a gas input end is arranged at the bottom of the tubular furnace 2, the gas input end is communicated with a gas supply device, the gas supply device is used for feeding reducing components in the gas into the tubular furnace 2, the reducing components in the gas fed into the tubular furnace 2 and the zinc-containing dust of the iron and steel plant fed into the tubular furnace 2 undergo gas-solid coupling reduction reaction in the tubular furnace 2, the gas supply device comprises a gas storage tank 10 and a blower 11, the output end of the gas storage tank 10 is connected with the input end of the blower 11, and the output end of the blower 11 is connected with the gas input end arranged at the bottom of the tubular furnace 2;
the input of condenser 4 is connected with the gaseous output of top of tube furnace 2, and the output of condenser 4 communicates with the gaseous input of air exhauster 5 through the pipeline, and wherein the suction effect of air exhauster 5 is with the volatile gaseous zinc steam drainage in the flue gas of tube furnace 2 to condenser 4, uses condenser 4 to take suction air exhauster 5 to take suction stream to the volatile gaseous zinc steam in condenser 4 to condense, and wherein condenser 4 includes condensation chamber 4.1 and condensate outlet 4.2.
The device for extracting valuable metals from zinc-containing dust in a steel plant adopts a gas-air double-injection system, an air heat storage system, a gas injection system and a related smoke exhaust system are respectively arranged, during normal operation, air is injected into a heat storage chamber from a heat storage tank, fuel in the heat storage chamber is ignited to generate a large amount of heat, raw materials in a tubular furnace 2 are reduced, gas in a gas storage tank 10 in gas supply equipment is injected into the tubular furnace 2 from the bottom of the tubular furnace 2 by a blower 11, the gas is equivalent to carrier gas, on one hand, volatile gaseous metal gas in flue gas of the tubular furnace 2 is guided into a condenser 4 from bottom to top by the negative pressure provided by an exhaust fan 5, the gas in the tubular furnace 2 is guided, the dynamic conditions in the tubular furnace (a material reduction zone of the tubular furnace) are improved, and the volatilization speed of zinc steam is enhanced; on the other hand, the reducing gas component in the gas can also serve as a part of reducing agent to reduce oxides in the raw materials together with the reducing agent in the tube furnace 2, so that the effect of gas-solid coupling reduction is realized. When the flue gas is led to the condenser 4 by the gas, the gaseous metal is condensed into solid metal in the condenser 4, so that the recovery of volatile valuable metal is realized. The majority of the gas after drainage and reduction is CO gas, and the CO gas is sent into the annular heat accumulation chamber by the exhaust fan for re-combustion and utilization, and the waste gas is discharged at the other side. The gas used for injection can be reducing gas generated in the working procedures of steel plants such as blast furnace gas, converter gas, coke oven gas and the like. The device can well recover valuable metals in zinc-containing dust of a steel plant, is suitable for various fuels, has low loss, adopts a reducing gas injection technology, enhances the reduction effect by gas-solid coupling reduction, enhances the gas diffusion dynamics condition in the reduction device, and simultaneously burns and utilizes the drained gas again, thereby remarkably improving the yield of the valuable metals.
Specifically, the method can achieve that the zinc steam is wrapped and clamped to the condenser 4 through the coal gas as carrier gas, the volatilization rate of the zinc steam in the tube furnace 2 is enhanced, the valuable metal yield is improved, but in order to further enable the heat distribution of the heat storage chambers to be uniform, the first heat storage chamber 6.1 and the second heat storage chamber 6.2 are of annular structures, so that the heat storage chambers comprise the first heat storage chamber 6.1 and the second heat storage chamber 6.2, the first heat storage chamber 6.1 and the second heat storage chamber 6.2 are communicated with a heat storage tank, the first heat storage chamber 6.1 is arranged above the second heat storage chamber 6.2, the first heat storage chamber 6.1 and the second heat storage chamber 6.2 are of annular structures, the tube furnace 2 is arranged inside the first heat storage chamber 6.1 and the second heat storage chamber 6.2, and the heat output of each heat storage chamber (the first heat storage chamber 6.1 and the second heat storage chamber 6.2) can be independently controlled. The temperature of the first regenerator 6.1 is ensured to be high enough to avoid the premature condensation of gaseous zinc vapor before reaching the condenser.
Specifically, in order to further continuously perform the reaction and reduce the potential safety hazard of the reaction, the output end of the exhaust fan 5 is connected with a gas storage tank 9, so that the gas rich in CO generated by the reaction is sent into the gas storage tank 9 to realize operation pressure stabilization.
Specifically, in order to further improve the drainage and the utilization rate of the reducing gas, the output end of the gas storage tank 9 is communicated with the regenerator for delivering the gas rich in CO into the regenerator for combustion and reuse.
Specifically, in order to further reduce the emission of waste gas (carbon dioxide flue gas after combustion), green low-carbon production is realized, and excessive pollution to the atmosphere is avoided, so the flue gas is required to be intensively discharged, so the heat storage chamber is also connected with an exhaust gas emission tower 7 through a pipeline, and the exhaust gas emission tower 7 is used for sending the gas after the combustion and the reutilization of the heat storage chamber to the exhaust gas emission tower for emission.
Specifically, in order to increase the outward diffusion rate of zinc vapor generated by reduction and increase the metal collection rate, the openings of the gas input end and the gas output end of the tube furnace 2 are circular ， And the circle centers are all positioned on the vertical central line of the tube furnace 2, and the radius of the opening is 1/7-1/5 of the radius of the tube furnace 2, so that the injected gas can move from bottom to top, and the gas generated after reduction is drained.
Specifically, the top gas output end of the tube furnace 2 is connected with the input end of the condenser 4 through a pipeline, and a filter screen 3 is arranged in the pipeline and is used for removing dust in gas flue gas.
Specifically, the diameter of the filter screen 3 is the same as the diameter of the inlet of the condensing chamber 4.1 in the condenser 4, and the filter screen is used for comprehensively filtering the smoke dust sent into the condensing chamber 4.1 by the tube furnace 2, so that the smoke dust can be filtered out by the filter screen once when entering the condensing chamber.
Specifically, when condenser 4 is established in tube furnace 2 outside, the vertical central line of filter screen 3 is 90 with horizontal contained angle, condenser 4 establishes inside tube furnace 2, the vertical central line of filter screen 3 is 70 ~ 80 with horizontal contained angle, and when condenser 4 was established in tube furnace 2 outside, the flue dust that filter screen 3 filtered directly falls in tube furnace 2 pipeline, is perpendicular in order to guarantee that the atress of filter screen 3 is even, minimizes the size and the easy to assemble of filter screen 3 simultaneously. The condensation product outlet of condenser 4 sets up in the one side that is close to air exhauster 5 and ground in order to be convenient for collect, because gravity effect, condensation product receives downward force, can enrich in the one side of leaning on ground, is close to the condensation route of air exhauster 5 fan department in order to maximize flue gas, and the whole condensation of flue gas improves the yield as far as possible. The condensed product outlet is thus provided.
When condenser 4 is established in tubular furnace 2 inside, as shown in fig. 2, the flue gas flow direction is vertical direction this moment, sets up the vertical central line of filter screen 3 and horizontal contained angle and is 70 ~ 80, and the purpose is in order to collect filterable smoke and dust in bottom contained angle department, avoids the smoke and dust to fall into the stove and influences the raw materials reduction. The longitudinal section of condensation, 4 is right trapezoid, and inclined waist one side is close to ground, and the condensate outlet of condenser 4 sets up in trapezoidal inclined waist's outside, and the setting purpose that is close to one side of waste gas discharge tower 7 and ground is that the gravity effect that receives after the condensate condensation can make it enrich in the bottom, and condenser 4 cross-section is trapezoidal in order to enrich condensate in one place, is convenient for collect. The external and internal arrangement of the condenser 4 is to provide selective diversification, and may be limited by space in practical application, and the two ways can be selected independently according to practical situations.
Specifically, the bottom of the tubular furnace 2 is obliquely communicated with a conveying pipe for conveying metallized pellets of chemical reaction products of the tubular furnace 2, the high end of the conveying pipe is communicated with the inner cavity of the tubular furnace 2, the low end of the conveying pipe penetrates out of the regenerative heating furnace 1, and the penetrating-out end of the conveying pipe is communicated with a metallized pellet collecting barrel 8 positioned outside the regenerative heating furnace 1.
The metallized pellets are iron metal, because the zinc-containing dust in the iron and steel plant contains ferric oxide and the like, and the ferric oxide can undergo oxidation-reduction reaction with a reducing component CO in the flue gas to generate iron. The metallized pellet collecting vessel 8 and the exhaust gas discharging tower 7 are arranged on the same side as far as possible, because the metallized pellet collecting vessel 8 can damage the bottom of the tubular furnace 2 if placed on the inner side, and the metallized pellet collecting vessel 8 is arranged on the same side as the exhaust gas and is arranged on the side of the equipment, so that the integrity of the bottom of the tubular furnace 2 is ensured as far as possible, but the metallized pellet collecting vessel is not required.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An extraction device for valuable metals in zinc-containing dust, which is characterized by comprising: the device comprises a heat accumulating type heating furnace (1), a tube furnace (2), a heat accumulating chamber, gas supply equipment, a condenser (4) and an exhaust fan (5), wherein:
a regenerative heating furnace (1) is internally provided with a regenerative chamber which is communicated with a regenerative tank;
the tubular furnace (2) is arranged in the regenerator, zinc-containing dust of the iron and steel plant is added in the tubular furnace (2), the top of the tubular furnace (2) is provided with a gas output end, and the bottom of the tubular furnace (2) is provided with a gas input end communicated with a gas supply device;
the input end of the condenser (4) is connected with the top gas output end of the tube furnace (2), and the output end is communicated with the gas input end of the exhaust fan (5) through a pipeline.
2. The device for extracting valuable metals from zinc-containing dust according to claim 1, wherein the regenerators comprise a first regenerator (6.1) and a second regenerator (6.2), the first regenerator (6.1) and the second regenerator (6.2) are both communicated with a heat storage tank, the first regenerator (6.1) is arranged above the second regenerator (6.2), the first regenerator (6.1) and the second regenerator (6.2) are both of annular structures, and the tubular furnace (2) is arranged inside the first regenerator (6.1) and the second regenerator (6.2).
3. The device for extracting valuable metals from zinc-containing dust according to claim 1, wherein the output end of the exhaust fan (5) is connected with a gas storage tank (9) for sending CO-rich gas generated by the reaction into the gas storage tank (9) to realize operation pressure stabilization.
4. A device for extracting valuable metals from zinc-containing dust according to claim 3, characterized in that the output end of the gas storage tank (9) is connected to a regenerator for feeding CO-rich gas into the regenerator for reuse.
5. The device for extracting valuable metals from zinc-containing dust according to claim 4, wherein the regenerator is further connected with an exhaust gas discharge tower (7) through a pipeline, and the device is used for delivering the gas after the combustion and the recycling of the regenerator into the exhaust gas discharge tower (7) for discharge.
6. The device for extracting valuable metals from zinc-containing dust according to claim 1, characterized in that the openings of the gas input end and the gas output end of the tube furnace (2) are circular ， And the circle centers are all positioned on the vertical central line of the tube furnace (2), and the radius of the opening is 1/7-1/5 of the radius of the tube furnace (2).
7. The extraction device of valuable metals in zinc-containing dust according to claim 1, characterized in that the top gas output end of the tube furnace (2) is connected with the input end of the condenser (4) through a pipeline, and a filter screen (3) is arranged in the pipeline for removing dust in the gas flue.
8. The device for extracting valuable metals from zinc-containing dust according to claim 7, characterized in that the diameter of the filter screen (3) is the same as the diameter of the inlet of the condensing chamber (4.1) in the condenser (4) for the complete filtration of the dust fed into the condensing chamber (4.1) by the tube furnace (2).
9. The device for extracting valuable metals from zinc-containing dust according to claim 7, wherein when the condenser (4) is arranged outside the tubular furnace (2), the vertical center line of the filter screen (3) forms an included angle of 90 degrees with the horizontal, and when the condenser (4) is arranged inside the tubular furnace (2), the vertical center line of the filter screen (3) forms an included angle of 70 degrees to 80 degrees with the horizontal.
10. The extracting device for valuable metals in zinc-containing dust according to claim 2, wherein a conveying pipe for conveying metallized pellets of chemical reaction products of the tubular furnace (2) is obliquely communicated with the bottom of the tubular furnace (2), the high end of the conveying pipe is communicated with the inner cavity of the tubular furnace (2), the low end of the conveying pipe penetrates out of the regenerative heating furnace (1), and the penetrating-out end of the conveying pipe is communicated with a metallized pellet collecting barrel (8) positioned outside the regenerative heating furnace (1).
Priority Applications (1)
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| CN202322032271.2U CN220643224U (en) | 2023-07-31 | 2023-07-31 | Extracting device for valuable metals in zinc-containing dust |
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