CN205907333U - System for handle zinc leaching residue - Google Patents
System for handle zinc leaching residue Download PDFInfo
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- CN205907333U CN205907333U CN201620831654.3U CN201620831654U CN205907333U CN 205907333 U CN205907333 U CN 205907333U CN 201620831654 U CN201620831654 U CN 201620831654U CN 205907333 U CN205907333 U CN 205907333U
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Abstract
The utility model discloses a system for handle zinc leaching residue, include: drying device, it has zinc leaching residue entry and zinc leaching residue dry discharge, breaker, it has zinc leaching residue drier entry and zinc leaching residue powder outlet, levigate device, it has the raw coal of going back entry and gos back raw coal fine material outlet, mix forming device, it has zinc leaching residue powder inlet, gos back the raw coal carefully expects the entry and mixes the pelletizing export, the rotary hearth furnace, it divide into intake zone, first reducing zone, second reducing zone, third reducing zone and the ejection of compact along the stove bottom rotation direction in proper order distinguishes, and the intake zone is provided with mixed pelletizing entry, and first reducing zone is provided with the smoke and dust export, and ejection of compact district is provided with the metallized pellet export. This system can realize the comprehensive recovery of zinc among the zinc leaching residue, lead and indium to the volatility of zinc can reach more than 98%, and the volatility of indium can reach 95%, and plumbous volatility is greater than 96%, and the reduction back pelletizing metallization rate can reach more than 90%.
Description
Technical field
The utility model belongs to metallurgical technology field, and specifically, the utility model is related to a kind of process zinc leaching residue
System.
Background technology
The smelting of zinc mainly has pyrogenic process and wet method two ways.Pyrogenic process is with high temperature fuming volatilization, in the form of zno flue dust
Return to leach and reclaim zinc therein；Wet method is high temperature high acidic oils, make zinc enter solution, simultaneously substantial amounts of iron also enter therewith molten
Liquid, subsequently removes iron using jarosite process, goethite process or hematite process, makes liquid containing zinc again return to neutral leaching and reclaims wherein
Zinc.For many years it was verified that with neutral leachings, high temperature high acid treatment leached mud, except iron, purification, the zinc hydrometallurgy being electrolysed,
Have the advantages that certain in the rate of recovery of zinc, comprehensively recovering valuable metal, energy-conservation and environmental protection compared with pyrogenic process.So far zinc hydrometallurgy becomes
Produce the main method of zinc, in the total output of world's zinc, about 80% is to use wet production.
In Zinc Hydrometallurgy Process, two kinds of techniques are typically had to be reclaimed using leaching the zinc leaching residue obtaining in two sections, one
It is pyrogenic process, that is, adopt rotary kiln evaporation method；Another kind is wet method, i.e. hot acid lixiviation process.In zinc leaching residue, zinc is primarily present shape
Formula is zinc ferrite, zinc oxide, zinc sulphide and zinc silicate, indium mainly with class matter in-phase version exist with the materials such as zinc ferrite in,
While zinc ferrite decomposes, indium reduces after being also decomposed, and is changed in gas entrance rotary kiln flue gas and is reclaimed.Rotary kiln is waved
In Fa Fashi China zinc hydrometallurgy, zinc leaching residue processes the typical process using, the domestic development through more than 30 years, its technology
Ripe, the existing more zine-smelting plant with strain smelting as representative adopts.Zinc kiln slag be leached mud during zinc hydrometallurgy again with addition of
40%～50% coke powder, what operating condition was poor needs to allocate into 80%～100% coke powder, extracts under high temperature in rotary kiln
Residue after the metals such as zinc, lead.By being leached kiln slag again, acid consumption is huge.In addition, being waved by rotary kiln fuming
Send out can reclaim 92～94% zinc and 82～84% lead and 10% about silver, the volatility < 80% of indium.
The main cause causing rotary kiln element recovery rate low is temperature and control climate is uneven, and temperature and atmosphere
Control and all have much relations with aeration operation in coke amount of allocating and kiln, when in rotary kiln, coke amount of allocating is low, lead Zinc volatilization rate
Decline clearly, amount of allocating is higher, on the one hand lead to the excessive production cost of fuel consumption to remain high, secondly in kiln, local holds
Easily form excessive temperature and strongly reducing atmosphere area, easily cause indium oxide crosses the indium metal that reduction forms difficult volatilization, leads to
The volatility of indium is low, and forms the hardly possible reduction volatilization material such as zinc silicate, and the volatility of zinc also reduces.Eutectic is easily caused in high-temperature region
The fusing of point material, causes formation rings in a kiln, affects body of heater direct motion.
Therefore, the existing technology processing zinc leaching residue is further improved.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.For this reason, this reality
Be to propose a kind of system processing zinc leaching residue with a new purpose, this system can realize zinc in zinc leaching residue, indium,
Lead efficient volatilization, and Zn content < 0.7% in metallized pellet after reduction volatilization, lead content < 0.5%, indium content <
0.004%, it is computed, the volatility of zinc can reach more than 98%, and the volatility of indium can reach 95%, and lead volatility rate is more than
96%, after reduction, pelletizing degree of metalization is up to more than 90%.
In one side of the present utility model, the utility model proposes a kind of system processing zinc leaching residue.According to this
The embodiment of utility model, this system includes:
Drying unit, described drying unit has zinc leaching residue entrance and zinc leaching residue drier outlet；
Breaker, described breaker has zinc leaching residue siccative entrance and zinc leaching residue dust outlet, described zinc leaching
Siccative entrance of slagging tap is connected with described zinc leaching residue drier outlet；
Fine mill, described fine mill has reduction coal entrance and the outlet of reduction coal fines；
Mixed-forming device, described mixed-forming device has zinc leaching residue powdering inlet, reduction coal fines entrance and mixes
Close pelletizing outlet, described zinc leaching residue powdering inlet is connected with described zinc leaching residue dust outlet, described reduction coal fines entrance
It is connected with the outlet of described reduction coal fines；
Rotary hearth furnace, described rotary hearth furnace is divided into feed zone, the first reducing zone, the second reduction along furnace bottom rotation direction
Area, the 3rd reducing zone and discharge zone, described feed zone is provided with mixing pelletizing entrance, and described mixing pelletizing entrance is mixed with described
Pelletizing outlet is connected, and described first reducing zone is provided with flue dust outlet, and described discharge zone is provided with metallized pellet outlet.
Thus, the system of the process zinc leaching residue according to the utility model embodiment is by being soaked to containing zinc using rotary hearth furnace
The mixing pelletizing of powder and reduction coal fines of slagging tap carries out reduction treatment so that the lead zinc indium compound in mixing pelletizing is turning bottom
There is reduction reaction and be recovered in the form of lead oxide, zinc oxide and the sub- indium of oxidation in flue in the first reducing zone of stove, and
Iron compound in the second reducing zone of rotary hearth furnace and the 3rd reducing zone mixing pelletizing carries out drastic reduction, the metallic iron obtaining
Particle aggregation is grown up and is obtained metallized pellet, simultaneously because in rotary hearth furnace the gentle atmosphere of temperature controllability, by controlling first also
Atmosphere in former area can reduce the reduction further of the sub- indium of oxidation, prevents it from generating difficult volatile indium metal, thus improving
The volatility of indium, and can significantly improve the degree of metalization of gained metallized pellet.Thus, using the application system not
Address only the problem that zinc leaching residue bulk deposition pollutes environment, and achieve iron lead zinc indium in zinc leaching residue etc. and have valency gold
The comprehensive reutilization belonging to, and the volatility of zinc can reach more than 98%, and the volatility of indium can reach more than 95%, lead volatility
Rate can reach more than 96%, and after reduction, pelletizing degree of metalization is up to more than 90%.
Optional, the described system processing zinc leaching residue further includes: waste heat boiler, described waste heat boiler has flue dust
Entrance and cooling flue dust outlet, described flue dust entrance is connected with the outlet of described flue dust；Cooling device, described cooling device has fall
Warm flue dust entrance and cooling flue dust outlet, described cooling flue dust entrance is connected with described cooling flue dust outlet；Bagroom, institute
State bagroom and there is cooling flue dust entrance, dust outlet and gas vent, described cooling flue dust entrance and described cooling cigarette
Dirt outlet is connected.
Additional aspect of the present utility model and advantage will be set forth in part in the description, partly will be from explained below
In become obvious, or recognized by practice of the present utility model.
Brief description
Above-mentioned and/or additional aspect of the present utility model and advantage will from reference to the description to embodiment for the accompanying drawings below
Become obvious and easy to understand, wherein:
Fig. 1 is the system structure diagram of the process zinc leaching residue according to one embodiment of the utility model；
Fig. 2 be according to another embodiment of the utility model process zinc leaching residue system in rotary hearth furnace structural representation
Figure；
Fig. 3 is the system structure diagram of the process zinc leaching residue according to the utility model further embodiment；
Fig. 4 is that the system of the process zinc leaching residue using one embodiment of the utility model is implemented to process the side of zinc leaching residue
Method schematic flow sheet；
Fig. 5 is that the system of the process zinc leaching residue using the utility model further embodiment is implemented to process zinc leaching residue
Method flow schematic diagram.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of described embodiment is shown in the drawings, wherein ad initio
To the element that same or similar label represents same or similar element or has same or like function eventually.Below by ginseng
The embodiment examining Description of Drawings is exemplary it is intended to be used for explaining the utility model, and it is not intended that to the utility model
Restriction.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
Individual, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
It is mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, limit unless otherwise clear and definite.Common skill for this area
For art personnel, concrete meaning in the utility model for the above-mentioned term can be understood as the case may be.
In one side of the present utility model, the utility model proposes a kind of method implementing above-mentioned process zinc leaching residue
System.According to embodiment of the present utility model, with reference to Fig. 1-3, this system includes: drying unit 100, breaker 200, mill
Thin device 300, mixed-forming device 400, rotary hearth furnace 500.
According to embodiment of the present utility model, drying unit 100 has zinc leaching residue entrance 101 and zinc leaching residue siccative goes out
Mouthfuls 102, and be suitable to zinc leaching residue and carry out drying and processing, obtain zinc leaching residue siccative.Thus, it is possible to improve the sequential reduction stage
The rate of recovery of zinc, lead and indium.Specifically, zinc leaching residue is the leached mud being obtained using conventional wet lay zinc metallurgy flow process.
According to embodiment of the present utility model, breaker 200 has zinc leaching residue siccative entrance 201 and zinc leaching residue powder
End outlet 202, zinc leaching residue siccative entrance 201 is connected with zinc leaching residue drier outlet 102, and is suitable to soak zinc obtained above
Siccative of slagging tap carries out break process, obtains zinc leaching residue powder.Thus, it is possible to significantly improve sequential reduction stage iron lead zinc indium
Compound and the contact area of reducing agent, thus improve the rate of recovery of iron, zinc, lead and indium.
According to an embodiment of the present utility model, the particle diameter of zinc leaching residue powder is not particularly restricted, this area skill
Art personnel can be selected according to actual needs, according to a specific embodiment of the present utility model, zinc leaching residue powder
Particle diameter can be 75 μm～4mm.Thus, it is possible to significantly improve the rate of recovery of sequential reduction stage iron, zinc, lead and indium.
According to embodiment of the present utility model, fine mill 300 has reduction coal entrance 301 and the outlet of reduction coal fines
302, and be suitable to for reduction coal to carry out levigate process, obtain reduction coal fines.Thus, it is possible to make carbon dust be distributed in mixing pelletizing
More uniform, significantly improve the rate of recovery of sequential reduction stage zinc, lead and indium.
According to an embodiment of the present utility model, the particle diameter of reduction coal fines is not particularly restricted, art technology
Personnel can be selected according to actual needs, according to a specific embodiment of the present utility model, particle diameter in reduction coal fines
Not higher than 75 μm can account for more than 70%.Inventor is had been surprisingly found that by many experiments, will be permissible for levigate for reduction coal one side
So that carbon dust is distributed in mixing pelletizing more uniform, be conducive to the abundant volatilization of zinc lead phosphide element, in addition powdery coal is gone back in stove
In the case that originality atmosphere is weaker can generating unit divided combustion, can to pelletizing provide partial heat.
According to further embodiment of the present utility model, the volatile matter of reduction coal can be not higher than 15%, the ash of reduction coal
Fusing point can be not less than 1200 degrees Celsius.Specifically, by controlling volatile matter and the ash fusion point of reduction coal, follow-up going back can be prevented
During the reason of original place, the fusing soft heat of pelletizing is it is ensured that pellet strength, and prevents pelletizing from forming crust and then affecting indium, zinc and lead
Volatilization, inventor has been surprisingly found that in many experiments, the ash fusion point of reduction coal is too low can lead to meltable in pelletizing reduction process
Change, and the volatile matter of reduction coal is too high that carbothermic reduction reaction in pelletizing can be caused excessively rapid, and cause pelletizing efflorescence, in pelletizing
Carbon scaling loss is excessively serious, thus can ensure that indium in zinc leaching residue, zinc and lead using the reduction coal of this volatile matter and ash fusion point
There is the higher rate of recovery.
According to embodiment of the present utility model, mixed-forming device 400 has zinc leaching residue powdering inlet 401, reduction coal
Fines entrance 402 and mixing pelletizing outlet 403, zinc leaching residue powdering inlet 401 is connected with zinc leaching residue dust outlet 202, also
Raw coal fines entrance 402 is connected with reduction coal fines outlet 302, and is suitable to zinc leaching residue powder obtained above and reduction coal
Fines carries out mixed-forming, obtains mixing pelletizing.Thus, it is possible to improve the recovery of sequential reduction stage zinc, lead and indium further
Rate.
According to an embodiment of the present utility model, zinc leaching residue powder is not subject to spy with the mixed proportion of reduction coal fines
Do not limit, those skilled in the art can be selected according to actual needs, according to a specific embodiment of the present utility model,
Zinc leaching residue powder is according to mass ratio 100:(15～40 with reduction coal fines) mixed, inventor is favorite in many experiments
Outer discovery, the too low reduction volatilization being unfavorable for lead in pelletizing, zinc and indium of the amount of allocating of reduction coal, and the amount of allocating of reduction coal is too high
Cost can be increased, cause to aoxidize crossing of sub- indium simultaneously and reduce, thus lead to indium the rate of recovery too low.Thus adopt in the application
Mixing match is so that account for the 30～60% of total carbon for the carbon burning in mixing pelletizing, carbon phase is for the coefficient of excess of oxygen
For 1.6～2.2, such that it is able to reduce excess carbon, the depth of indium is reduced, prevent from forming difficult volatile metal indium, and then improve zinc leaching
Slag tap the rate of recovery of middle lead zinc indium.
According to embodiment of the present utility model, with reference to Fig. 1 and 2, sequentially form along furnace bottom rotation direction in rotary hearth furnace 500
Feed zone 51, the first reducing zone 52, the second reducing zone 53, the 3rd reducing zone 54 and discharge zone 55, feed zone 51 has mixing ball
Group's entrance 501, the first reducing zone 52 has flue dust outlet 502, and discharge zone 55 has metallized pellet outlet 503, mixes pelletizing
Entrance 501 is connected with mixing pelletizing outlet 403, and is suitable to supply mixing pelletizing obtained above to the feed zone of rotary hearth furnace,
Feed zone preheats to mixing pelletizing under the heat radiation of the first reducing zone, the second reducing zone and the 3rd reducing zone, Ran Housui
The rotation of furnace bottom, mixing pelletizing enters the first reducing zone, the lead zinc indium compound in mixing pelletizing occur reduction reaction and
It is recovered in flue in the form of lead oxide, zinc oxide and the sub- indium of oxidation, and in the second reducing zone and the 3rd reducing zone, mix
There is preliminary reduction and drastic reduction in the iron compound in pelletizing, the continuous agglomeration of iron granule of generation, to metallize
The form of pelletizing is discharged from discharge zone.
According to further embodiment of the present utility model, the temperature of three reducing zones of rotary hearth furnace is not particularly restricted, this
Skilled person can be selected according to actual needs, according to a specific embodiment of the present utility model, the first reduction
The temperature in area is 1000～1200 degrees Celsius, 1200～1230 degrees Celsius of the temperature of the second reducing zone, the temperature of the 3rd reducing zone
For 1200～1250 degrees Celsius.Inventor find, can be significantly better than under this temperature conditions other improve mixing pelletizings in iron,
The rate of recovery of lead, zinc and indium.
According to another embodiment of the present utility model, the co concentration of three reducing zones of rotary hearth furnace is not particularly restricted,
Those skilled in the art can be selected according to actual needs, according to a specific embodiment of the present utility model, rotary hearth furnace
The co concentration of three reducing zones is separately 9000～15000ppm.Inventor is had been surprisingly found that by many experiments, reduction
The too low reduction being unfavorable for iron, lead and zinc of area's co concentration, and the first reducing zone co excessive concentration can cause to aoxidize the mistake of sub- indium also
Former and generate difficult volatile metal indium, thus leading to phosphide element volatility to reduce.Thus, the first reducing zone of rotary hearth furnace,
The atmosphere that two reducing zones and the 3rd reducing zone are respectively adopted this carbonomonoxide concentration can ensure that there is certain reduction around pelletizing
Property atmosphere, thus further improve sequential reduction stage iron, the rate of recovery of zinc, lead and indium.
Thus, the system of the process zinc leaching residue according to the utility model embodiment is by being soaked to containing zinc using rotary hearth furnace
The mixing pelletizing of powder and reduction coal fines of slagging tap carries out reduction treatment so that the lead zinc indium compound in mixing pelletizing is turning bottom
There is reduction reaction and be recovered in the form of lead oxide, zinc oxide and the sub- indium of oxidation in flue in the first reducing zone of stove, and
Iron compound in the second reducing zone of rotary hearth furnace and the 3rd reducing zone mixing pelletizing carries out drastic reduction, the metallic iron obtaining
Particle aggregation is grown up and is obtained metallized pellet, simultaneously because in rotary hearth furnace the gentle atmosphere of temperature controllability, by controlling first also
Atmosphere in former area can reduce the reduction further of the sub- indium of oxidation, prevents it from generating difficult volatile indium metal, thus improving
The volatility of indium, and can significantly improve the degree of metalization of gained metallized pellet.Thus, using the application system not
Address only the problem that zinc leaching residue bulk deposition pollutes environment, and achieve iron lead zinc indium in zinc leaching residue etc. and have valency gold
The comprehensive reutilization belonging to, and the volatility of zinc can reach more than 98%, and the volatility of indium can reach more than 95%, lead volatility
Rate can reach more than 96%, and after reduction, pelletizing degree of metalization is up to more than 90%.
With reference to Fig. 3, the system of the process zinc leaching residue according to the utility model embodiment further includes: waste heat boiler
600th, cooling device 700 and bagroom 800.
According to embodiment of the present utility model, waste heat boiler 600 has flue dust entrance 601 and cooling flue dust outlet 602, cigarette
Dirt entrance 601 is connected with flue dust outlet 502, and is suitable to the first reducing zone discharge is sub- containing lead oxide, zinc oxide and oxidation
The flue dust of indium carries out waste heat recovery, obtains flue dust of lowering the temperature.Thus, by obtained containing lead oxide, zinc oxide and oxidation
This part of waste heat can be used for generating electricity by the flue dust waste heat recovery of sub- indium, thus realizing maximally utilizing of resource.
According to embodiment of the present utility model, cooling device 700 has cooling flue dust entrance 701 and cooling flue dust outlet
702, cooling flue dust entrance 701 is connected with cooling flue dust outlet 602, and is suitable to carry out cooling flue dust obtained above at cooling
Reason, obtains cooling down flue dust.Specifically, cooling flue dust temperature after surface-cooler obtained above is down to 250 DEG C about.
According to embodiment of the present utility model, bagroom 800 has cooling flue dust entrance 801, dust outlet 802 and
Gas vent 803, cooling flue dust entrance 801 is connected with cooling flue dust outlet 702, and is suitable to enter cooling flue dust obtained above
Row bag collection, such that it is able to collect dust.
Understand for convenience, below with reference to the system to the process zinc leaching residue using the utility model embodiment for the Figure 4 and 5
The method implementing to process zinc leaching residue is described in detail.According to embodiment of the present utility model, the method includes:
S100: zinc leaching residue is carried out drying and processing
According to embodiment of the present utility model, zinc leaching residue is carried out drying and processing, obtain zinc leaching residue siccative.Thus,
Be conducive to material to mix, the rate of recovery of sequential reduction stage iron, zinc, lead and indium can be improved.Specifically, zinc leaching residue is employing
The leached mud that conventional wet lay zinc metallurgy flow process obtains.
S200: zinc leaching residue siccative is carried out break process
According to embodiment of the present utility model, zinc leaching residue siccative obtained above is carried out break process, obtain zinc leaching
Slag tap powder.Thus, it is possible to significantly improve the contact area of sequential reduction stage iron lead zinc indium compound and reducing agent, thus carrying
The rate of recovery of high ferro, zinc, lead and indium.
According to an embodiment of the present utility model, the particle diameter of zinc leaching residue powder is not particularly restricted, this area skill
Art personnel can be selected according to actual needs, according to a specific embodiment of the present utility model, zinc leaching residue powder
Particle diameter can be 75 μm～4mm.Thus, it is possible to improve iron, the rate of recovery of zinc, lead and indium in mixing pelletizing further.
S300: reduction coal is carried out levigate process
According to embodiment of the present utility model, reduction coal is carried out levigate process, obtain reduction coal fines.Thus, it is possible to
Significantly improve the contact area of zinc leaching residue and coal dust, thus improving iron, the recovery of zinc, lead and indium in zinc leaching residue further
Rate.
According to an embodiment of the present utility model, the particle diameter of reduction coal fines is not particularly restricted, art technology
Personnel can be selected according to actual needs, according to a specific embodiment of the present utility model, particle diameter in reduction coal fines
Not higher than 75 μm can account for more than 70%.Inventor is had been surprisingly found that by many experiments, will be permissible for levigate for reduction coal one side
So that carbon dust is distributed in mixing pelletizing more uniform, be conducive to the abundant volatilization of zinc indium lead element, in addition powdery coal is gone back in stove
In the case that originality atmosphere is weaker can generating unit divided combustion, can to pelletizing provide partial heat.
According to further embodiment of the present utility model, the volatile matter of reduction coal can be not higher than 15%, the ash of reduction coal
Fusing point can be not less than 1200 degrees Celsius.Specifically, by controlling volatile matter and the ash fusion point of reduction coal, follow-up going back can be prevented
During the reason of original place, the fusing soft heat of pelletizing is it is ensured that pellet strength, and prevents pelletizing from forming crust and then affecting indium, zinc and lead
Volatilization, inventor has been surprisingly found that in many experiments, the ash fusion point of reduction coal is too low can lead to meltable in pelletizing reduction process
Change, and the volatile matter of reduction coal is too high that carbothermic reduction reaction in pelletizing can be caused excessively rapid, and cause pelletizing efflorescence, in pelletizing
Carbon scaling loss is excessively serious, thus can ensure that indium in zinc leaching residue, zinc and lead using the reduction coal of this volatile matter and ash fusion point
There is the higher rate of recovery.
S400: zinc leaching residue powder and reduction coal fines are carried out mixed-forming
According to embodiment of the present utility model, zinc leaching residue powder obtained above and reduction coal fines are mixed into
Type, obtains mixing pelletizing.
According to an embodiment of the present utility model, zinc leaching residue powder is not subject to spy with the mixed proportion of reduction coal fines
Do not limit, those skilled in the art can be selected according to actual needs, according to a specific embodiment of the present utility model,
Zinc leaching residue powder is according to mass ratio 100:(15～40 with reduction coal fines) mixed, inventor is favorite in many experiments
Outer discovery, the too low reduction volatilization being unfavorable for lead in pelletizing, zinc and indium of the amount of allocating of reduction coal, and the amount of allocating of reduction coal is too high
Cost can be increased, cause to aoxidize crossing of sub- indium simultaneously and reduce, thus lead to indium the rate of recovery too low.Thus adopt in the application
Mixing match is so that account for the 30～60% of total carbon for the carbon burning in mixing pelletizing, carbon phase is for the coefficient of excess of oxygen
For 1.6～2.2, such that it is able to reduce excess carbon, the depth of indium is reduced, prevent from forming difficult volatile metal indium, and then improve zinc leaching
Slag tap the rate of recovery of middle lead zinc indium.
S500: mixing pelletizing is supplied to the feed zone of rotary hearth furnace, makes mixing pelletizing sequentially pass through the first of rotary hearth furnace and go back
Former area, the second reducing zone and the 3rd reducing zone carry out reduction treatment
According to embodiment of the present utility model, mixing pelletizing obtained above is supplied to the feed zone of rotary hearth furnace, feeds
Area preheats to mixing pelletizing under the heat radiation of the first reducing zone, the second reducing zone and the 3rd reducing zone, then as stove
The rotation at bottom, mixing pelletizing enters the first reducing zone, and the lead zinc indium compound in mixing pelletizing occurs reduction reaction and with oxygen
The form changing lead, zinc oxide and the sub- indium of oxidation is recovered in flue, and in the second reducing zone and the 3rd reducing zone, mixes pelletizing
In iron compound there is preliminary reduction and drastic reduction, the continuous agglomeration of iron granule of generation, with metallized pellet
Form from discharge zone discharge.
According to an embodiment of the present utility model, the temperature of three reducing zones of rotary hearth furnace is not particularly restricted, ability
Field technique personnel can be selected according to actual needs, according to a specific embodiment of the present utility model, the first reducing zone
Temperature be 1000～1200 degrees Celsius, 1200～1230 degrees Celsius of the temperature of the second reducing zone, the temperature of the 3rd reducing zone is
1200～1250 degrees Celsius.Inventor find, can be significantly better than under this temperature conditions other improve mixing pelletizings in iron, lead,
Zinc and the rate of recovery of indium.
According to an embodiment of the present utility model, the co concentration of three reducing zones of rotary hearth furnace is not particularly restricted, this
Skilled person can be selected according to actual needs, according to a specific embodiment of the present utility model, rotary hearth furnace three
The co concentration of individual reducing zone is separately 9000～15000ppm.Inventor is had been surprisingly found that by many experiments, reducing zone
The too low reduction being unfavorable for iron, lead and zinc of co concentration, and the first reducing zone co excessive concentration can cause to aoxidize excessively reducing of sub- indium
And generate difficult volatile metal indium, thus phosphide element volatility is led to reduce.Thus, the first reducing zone of rotary hearth furnace, second
The atmosphere that reducing zone and the 3rd reducing zone are respectively adopted this carbonomonoxide concentration can ensure that there is certain reproducibility around pelletizing
Atmosphere, thus improve sequential reduction stage iron, the rate of recovery of zinc, lead and indium further.
Thus, led to using the method that the system of the process zinc leaching residue of the utility model embodiment implements to process zinc leaching residue
Cross by mixed with reduction coal fines for zinc leaching residue powder mix pelletizing and supply carry out reduction treatment to rotary hearth furnace so that mixed
There is reduction reaction in the first reducing zone of rotary hearth furnace and with lead oxide, oxidation in flue in the lead zinc indium compound closing in pelletizing
The form of zinc and the sub- indium of oxidation is recovered, and the iron chemical combination in the second reducing zone in rotary hearth furnace and the 3rd reducing zone mixing pelletizing
Thing carries out drastic reduction, and the iron granule agglomeration obtaining obtains metallized pellet, simultaneously because in rotary hearth furnace temperature and
The controllability of atmosphere, can reduce the reduction further of the sub- indium of oxidation by controlling the atmosphere in the first reducing zone, prevent its life
Becoming difficult volatile indium metal, thus improve the volatility of indium, and the metal of gained metallized pellet can be significantly improved
Rate.Thus, not only solve, using the present processes, the problem that zinc leaching residue bulk deposition pollutes environment, and achieve
The comprehensive reutilization of the valuable metals such as the iron lead zinc indium in zinc leaching residue, and the volatility of zinc can reach more than 98%, indium
Volatility can reach more than 95%, lead volatility rate can reach more than 96%, and after reduction, pelletizing degree of metalization is up to more than 90%.
With reference to Fig. 5, the system using the process zinc leaching residue of the utility model embodiment is implemented to process the side of zinc leaching residue
Method further includes:
S600: the flue dust containing lead oxide, zinc oxide and the sub- indium of oxidation is carried out waste heat recovery
According to embodiment of the present utility model, the flue dust containing lead oxide, zinc oxide and the sub- indium of oxidation that s500 is obtained
Waste heat recovery, obtains flue dust of lowering the temperature.Thus, by more than the obtained flue dust containing lead oxide, zinc oxide and the sub- indium of oxidation
This part of waste heat can be used for generating electricity by recuperation of heat, thus realizing maximally utilizing of resource.
S700: cooling flue dust is carried out cooling treatment
According to embodiment of the present utility model, cooling flue dust obtained above is carried out cooling treatment, can be cooled
Flue dust.Specifically, cooling flue dust temperature after surface-cooler obtained above is down to 250 DEG C about.
S800: cooling flue dust is carried out bag collection
According to embodiment of the present utility model, cooling flue dust obtained above is carried out bag collection, such that it is able to collect
Dust.
Below with reference to specific embodiment, the utility model is described, it should be noted that these embodiments are only
Descriptive, and limit the utility model never in any form.
Embodiment 1
Zinc leaching residue is dried at 200 degrees celsius, in slag after drying, Zn content is 16.32wt%, lead content is
4.12wt%, indium content is 0.036wt%, and iron content is 23wt%, is then broken zinc leaching residue siccative using double-roll crusher
Broken to below 3mm, allocate into semi-coke powder (volatilization is divided into 8%, and ash fusion point is 1230 degrees Celsius, not higher than 75 μm of particle diameter account for 70%
More than), the amount of allocating of semi-coke powder is the 22% of zinc leaching residue siccative quality, and material is obtained mixing ball through ball press technique after mixing
Then mixing pelletizing is supplied the feed zone to rotary hearth furnace and is preheated by group, then successively through the first reducing zone, the second reduction
Area and the 3rd reducing zone are reduced, and wherein, the first reducing zone temperature is 1180 DEG C, and co concentration is 11000ppm, the second reduction
Area's co concentration is 12000ppm, temperature is 1200 DEG C, and the 3rd reducing zone co concentration is～14000ppm, and reduction temperature is effectively also
The former time is 48min, and residing time in furnace adds up to 52min, the flue dust containing lead oxide, zinc oxide and the sub- indium of oxidation obtaining
It is collected after flue dust outlet in rotary hearth furnace the first reducing zone is discharged, the metallized pellet that the 3rd reducing zone obtains is arranged through discharge zone
Go out, after measured, in metallized pellet, Zn content is 0.35wt%, and indium content is 0.0032wt%, and lead content is 0.24wt%, c
Content is 3.57wt%.
Embodiment 2
Zinc leaching residue is dried at 200 degrees celsius, in slag after drying, Zn content is 16.32wt%, lead content is
4.12wt%, indium content is 0.036wt%, and iron content is 23wt%, is then broken zinc leaching residue siccative using double-roll crusher
Broken to below 3mm, (volatilization is divided into 8%, and ash fusion point is 1230 degrees Celsius, the accounting for of not higher than 75 μm of particle diameter to allocate semi-coke powder into
75%), the amount of allocating of semi-coke powder is the 22% of zinc leaching residue siccative quality, and material is obtained mixing ball through ball press technique after mixing
Then mixing pelletizing is supplied the feed zone to rotary hearth furnace and is preheated by group, then successively through the first reducing zone, the second reduction
Area and the 3rd reducing zone are reduced, and wherein, the first reducing zone temperature is 1200 DEG C, and co concentration is 9000ppm, the second reducing zone
1230 DEG C of temperature, co concentration is 11000ppm, 1230 DEG C of the temperature of the 3rd reducing zone, and co concentration is～13000ppm, and three also
Former area is 48min effective recovery time, and residing time in furnace adds up to 52min, obtain containing lead oxide, zinc oxide and oxidation
The flue dust of sub- indium is collected after flue dust outlet in rotary hearth furnace the first reducing zone is discharged, the metallized pellet warp that the 3rd reducing zone obtains
Discharge zone is discharged, and after measured, Zn content is 0.67wt%, and indium content is 0.0040wt%, and lead content is 0.44wt%, c content
For 1.71wt%.
Embodiment 3
Zinc leaching residue is dried at 200 degrees celsius, in slag after drying, Zn content is 16.32wt%, lead content is
4.12wt%, indium content is 0.036wt%, and iron content is 23wt%, is then broken zinc leaching residue siccative using double-roll crusher
Broken to below 3mm, (volatilization is divided into 8%, and ash fusion point is 1230 degrees Celsius, the accounting for of not higher than 75 μm of particle diameter to allocate semi-coke powder into
78%), the amount of allocating of semi-coke powder is the 35% of zinc leaching residue siccative quality, and material is obtained mixing ball through ball press technique after mixing
Then mixing pelletizing is supplied the feed zone to rotary hearth furnace and is preheated by group, then successively through the first reducing zone, the second reduction
Area and the 3rd reducing zone are reduced, and wherein, the first reducing zone co concentration is 11000, and temperature is 1230 DEG C；Second reducing zone co
Concentration is 13000ppm, and reduction temperature is 1230 DEG C, and the co concentration of the 3rd reducing zone is 14000～15000ppm, and temperature is
1250 degrees Celsius, effective recovery time is 48min, and residing time in furnace adds up to 52min, obtain containing lead oxide, oxidation
The flue dust of zinc and the sub- indium of oxidation is collected after flue dust outlet in rotary hearth furnace the first reducing zone is discharged, the metal that the 3rd reducing zone obtains
Pellet is discharged through discharge zone, and after measured, in metallized pellet, Zn content is 0.22wt%, and indium content is 0.0025wt%, lead
Content is 0.31wt%, and c content is 4.71wt%.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
Any one or more embodiments or example combine in an appropriate manner.Additionally, in the case of not conflicting, this area
Technical staff the feature of the different embodiments described in this specification or example and different embodiment or example can be entered
Row combines and combines.
Although of the present utility model embodiment has been shown and described above it is to be understood that above-described embodiment is
Exemplary it is impossible to be interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
Interior above-described embodiment can be changed, change, replacing and modification.
Claims (2)
1. a kind of system processing zinc leaching residue is it is characterised in that include:
Drying unit, described drying unit has zinc leaching residue entrance and zinc leaching residue drier outlet；
Breaker, described breaker has zinc leaching residue siccative entrance and zinc leaching residue dust outlet, described zinc leaching residue
Siccative entrance is connected with described zinc leaching residue drier outlet；
Fine mill, described fine mill has reduction coal entrance and the outlet of reduction coal fines；
Mixed-forming device, described mixed-forming device has zinc leaching residue powdering inlet, reduction coal fines entrance and mixing ball
Group's outlet, described zinc leaching residue powdering inlet is connected with described zinc leaching residue dust outlet, described reduction coal fines entrance and institute
State the outlet of reduction coal fines to be connected；
Rotary hearth furnace, described rotary hearth furnace along furnace bottom rotation direction be divided into feed zone, the first reducing zone, the second reducing zone,
Three reducing zones and discharge zone, described feed zone is provided with mixing pelletizing entrance, and described mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and described first reducing zone is provided with flue dust outlet, and described discharge zone is provided with metallized pellet outlet.
2. system according to claim 1 is it is characterised in that further include:
Waste heat boiler, described waste heat boiler has flue dust entrance and cooling flue dust outlet, and described flue dust entrance and described flue dust go out
Mouth is connected；
Cooling device, described cooling device has cooling flue dust entrance and cooling flue dust outlet, described cooling flue dust entrance and institute
State cooling flue dust outlet to be connected；
Bagroom, described bagroom has cooling flue dust entrance, dust outlet and gas vent, described cooling flue dust
Entrance is connected with described cooling flue dust outlet.
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| CN201620831654.3U CN205907333U (en) | 2016-08-01 | 2016-08-01 | System for handle zinc leaching residue |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119535A (en) * | 2016-08-01 | 2016-11-16 | 江苏省冶金设计院有限公司 | Process the method and system of zinc leaching residue |
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