CN205907331U - System for handle siderotil sediment - Google Patents
System for handle siderotil sediment Download PDFInfo
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- CN205907331U CN205907331U CN201620830515.9U CN201620830515U CN205907331U CN 205907331 U CN205907331 U CN 205907331U CN 201620830515 U CN201620830515 U CN 201620830515U CN 205907331 U CN205907331 U CN 205907331U
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- vitriol slag
- iron vitriol
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- 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
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Abstract
The utility model discloses a system for handle siderotil sediment, include: drying device, mixing arrangement, it has siderotil sediment drier entry, inlet of coal powder and mixed material outlet, the rotary hearth furnace, it forms intake zone, preheating zone, well warm area, high -temperature region and the ejection of compact in proper order along the stove bottom rotation direction and distinguishes, and the intake zone is provided with mixture inlet, and well warm area is provided with the smoke and dust export, and well warm area and high -temperature region are provided with the nozzle respectively, and ejection of compact district is provided with water cooling plant, the export of metallization material and spiral scraper, and mixture inlet and mixed material outlet are continuous, the grinding magnetic separation device, it has metallization matter entrance, the export of metal iron powder and tailings export, and metallization matter entrance links to each other with the export of metallization material. This system has not only solved the problem that the polluted environment is piled up in a large number to the siderotil sediment, has realized in addition that the valuable metal's such as indisputable lead zinc silver in the siderotil sediment effective recycling utilizes to lead zinc silver's removing rate is more than 95%, and the rate of recovery of iron reaches more than 85%.
Description
Technical field
The utility model belongs to metallurgical technology field, and specifically, what the utility model was related to a kind of process iron vitriol slag is
System.
Background technology
Based on China's zinc abstraction technology is smelted in a wet process.By the difference of leachate deferrization process, goethite can be divided into
Method, hematite process and jarosite process etc..Wherein, jarosite process due to easy Precipitation, solubility is low, filterability is good, examination
Agent consumes few and low production cost and most widely used.It is exactly the ferro element in zinc infusion solution by the heavy alum operation of jarosite process
It is formed selectively precipitation, thus reaching iron and the detached final purpose of zinc.But except forming siderotil during heavy alum, also
The valuable metals such as the zinc of some, lead, silver enter iron vitriol slag in the form of silicate and sulfate together with siderotil.Based on Huang
The advantage of krausite method technique, in Zinc hydrometallurgy process, the whole nation has 45% yield to be smelted by this technique, but
It is that the siderotil amount that hot acid-jarosite process product removes is big, it is big to pollute.The siderotil quantity of slag is stored up more than 30,000,000 tons by China at present, and
To be increased with 1,000,000 tons of speed every year, huge potential pollution is produced to environment；Metal loss is big simultaneously, if iron vitriol slag
By averagely calculating containing zinc 5%, accumulate zinc amount of metal more than 1,500,000 tons, value is very high.Based on above 2 points, to iron vitriol slag
Further investigation, turns waste into wealth, is significant.
Process to iron vitriol slag mainly adopts high temperature reduction volatility process and aqueous solution lixiviation process at present.High temperature reduction volatility process
It is to allocate coke powder in iron vitriol slag into as reducing agent, carry out high-temperature roasting or melting in rotary kiln or fuming furnace, made
The reduction volatilizations such as valency metallic lead, zinc, silver, indium.Aqueous solution leaching method has two types, one kind be directly by sour for iron vitriol slag or
Alkali is leached；Second be by iron vitriol slag between 500-700 DEG C calcination in advance, the slag after calcination adopts acid or alkali again
Solution leaches the metal in iron vitriol slag.The advantage of high temperature reduction volatility process is can to reclaim lead in alum slag, zinc, indium etc. simultaneously,
These elements are all collected to zinc oxide fumes, but the method high energy consumption, and output containing scum due in volatilization zinc mistake
It is in melt state in journey, be mixed into a large amount of silicate in melt, lead to the yield containing iron in scum relatively low.Aqueous solution lixiviation process excellent
Gesture is that the content containing iron in scum after leaching reaches 55% about, but in slag, Zn content is higher, Zn content generally 1% with
On, because this part zinc is mainly existed with zinc ferrite form, when iron uses as iron-smelting raw material, zinc can cause to ironmaking processes
Adverse effect.
Therefore, the existing technology processing iron vitriol slag 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
It is to propose a kind of system processing iron vitriol slag with a new purpose, it is dirty that this system not only solves iron vitriol slag bulk deposition
The problem of dye environment, and achieve the effective recycling of the valuable metals such as the iron lead zinc-silver in iron vitriol slag, and lead zinc-silver
Extrusion rate more than 95%, the rate of recovery of iron reaches more than 85%.
In one side of the present utility model, the utility model proposes a kind of system processing iron vitriol slag.According to this reality
With new embodiment, this system includes:
Drying unit, described drying unit has iron vitriol slag entrance and iron vitriol slag drier outlet；
Mixing arrangement, described mixing arrangement has iron vitriol slag siccative entrance, coal powder entrance and mixed material outlet, described iron
Alum slag siccative entrance is connected with described iron vitriol slag drier outlet；
Rotary hearth furnace, described rotary hearth furnace sequentially forms feed zone, preheating zone, middle warm area, high-temperature region along furnace bottom rotation direction
And discharge zone, described feed zone is provided with mixed material entrance, and described middle warm area is provided with flue dust outlet, described middle warm area and institute
State high-temperature region and be respectively arranged with burner, described discharge zone is provided with water cooling plant, metallization material outlet and spiral scraper, institute
State mixed material entrance to be connected with the outlet of described mixed material；
Mill ore magnetic selection device, described mill ore magnetic selection device has metallization material inlet, metal iron powder outlet and tailings and goes out
Mouthful, described metallization material inlet is connected with described metallization material outlet.
Thus, the system of the process iron vitriol slag according to the utility model embodiment is passed through to mix iron vitriol slag siccative with coal dust
Supply and carry out decomposition-reduction process to rotary hearth furnace, in the preheating zone of rotary hearth furnace, siderotil decompose and zinc ferrite preliminary
Reduction, and the evaporation of the removing along with this crystallization water and bed of material moisture so that the mixing bed of material formed loose porous
Structure, and these loose structures improve the dynamic conditions in course of reaction, are conducive to rotary hearth furnace to reduce by force in middle warm area
In atmosphere, carbon monoxide enters inside the bed of material, thus not only improving the reduction efficiency of iron lead silver-colored zinc, and improves lead zinc-silver
Volatilization efficiency (extrusion rate of lead zinc-silver is more than 95%), realizes the drastic reduction of ferriferous oxide simultaneously, obtains gold in high-temperature region
Belong to the metallization material that rate reaches more than 88%, and by arranging water cooling plant to molten obtained by high-temperature region in discharge zone
The metallization material melting state carries out cooling treatment, can avoid metallization material and the rotary furnace bottom refractory material of molten state
Bonding, thus ensureing the smooth discharging of metal compound material, and then is separable to obtain metal iron powder (Iron grade reaches through mill ore magnetic selection
To more than 88%), compared with the high temperature reduction volatility process adopting in prior art, the application passes through can be notable using rotary hearth furnace
Reducing energy consumption, and iron recovery up to more than 85%.Thus, a large amount of heap of iron vitriol slag is not only solved using the system of the application
Contamination contaminates the problem of environment, and achieves the effective recycling of the valuable metals such as the iron lead zinc-silver in iron vitriol slag.
Optional, described mixing arrangement is spiral distributor.
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 iron vitriol slag according to one embodiment of the utility model；
Fig. 2 is that in system according to the process iron vitriol slag of the utility model further embodiment, the plan structure of rotary hearth furnace is shown
It is intended to；
Fig. 3 is that the system of the process iron vitriol slag using one embodiment of the utility model is implemented to process the method stream of iron vitriol slag
Journey 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.
In description of the present utility model it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward ",
The orientation of instruction such as " clockwise ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship are based on shown in the drawings
Orientation or position relationship, are for only for ease of description the utility model and simplify description, rather than the dress of instruction or hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the utility model
Restriction.
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 system processing iron vitriol slag.According to this reality
With new embodiment, with reference to Fig. 1 and 2, this system includes: drying unit 100, mixing arrangement 200, rotary hearth furnace 300 and ore grinding
Concentration equipment 400.
According to embodiment of the present utility model, drying unit 100 has iron vitriol slag entrance 101 and iron vitriol slag drier outlet
102, and be suitable to for iron vitriol slag to carry out drying and processing, obtain iron vitriol slag siccative.Specifically, containing 22～25% in iron vitriol slag
Iron, and a large amount of valuable metals such as lead zinc-silver, have higher economic benefit.It is embodied as according to one of the present utility model
Example, the water content in iron vitriol slag siccative can be 5～10wt%.Thus, the reduction effect of follow-up iron lead zinc-silver not only can be improved
Rate, and can ensure that the preheating zone in rotary hearth furnace, mixing bed of material moisture evaporation is so that the mixing bed of material forms loose porous knot
Structure, thus improve the volatility of lead zinc-silver.
According to embodiment of the present utility model, mixing arrangement 200 has iron vitriol slag siccative entrance 201, coal powder entrance 202 and
Mixed material outlet 203, iron vitriol slag siccative entrance 201 is connected with iron vitriol slag drier outlet 102, and is suitable to iron obtained above
Alum slag siccative is mixed with coal dust, obtains mixed material.Specifically, mixing arrangement can be spiral distributor.
According to an embodiment of the present utility model, iron vitriol slag siccative is not particularly restricted with the mixed proportion of coal dust,
Those skilled in the art can be selected according to actual needs, according to a specific embodiment of the present utility model, coal dust with
Iron vitriol slag siccative can be mixed for 1.6～2.0 according to carbon-to-oxygen ratio.Inventor finds, if coal dust addition is too low, leads to also
Former can not thoroughly carry out, thus reducing the rate of recovery of iron lead zinc-silver, and if coal dust addition is too high, carbon therein can not fire completely
Burn, lead to the product carbon content that reduction roasting terminates to obtain to raise.
According to further embodiment of the present utility model, the particle diameter of coal dust 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, the particle diameter of coal dust can for 0.5～
1mm.Inventor finds, if coal particle size excessively thick so that iron vitriol slag is insufficient contact with coal dust and affect sequential reduction effect, and
If coal dust is meticulous, in rotary hearth furnace, easy airborne dust, causes the loss of coal dust.
According to embodiment of the present utility model, with reference to Fig. 1 and 2, rotary hearth furnace 300 along furnace bottom rotation direction sequentially form into
Material area 31, preheating zone 32, middle warm area 33, high-temperature region 34 and discharge zone 35, feed zone 31 is provided with mixed material entrance 301, in
Warm area 33 is provided with flue dust outlet 302, and middle warm area 33 and high-temperature region 34 are respectively arranged with burner 36, and discharge zone 35 is provided with water-cooled
Device 37, metallization material outlet 303 and spiral scraper (not shown), mixed material entrance 301 and mixed material outlet 203
It is connected, and the feed zone being suitable to supply mixed material obtained above to rotary hearth furnace turns bottom so that mixed material sequentially passes through
The preheating zone of stove, middle warm area and high-temperature region carry out decomposition-reduction, obtain the flue dust containing silver oxide, lead oxide and zinc oxide and
The metallization material of molten condition, molten condition metallization material after the water cooling plant that discharge zone is arranged by spiral scraper
Discharge.
In this step, mixed material obtained above is supplied the feed zone to rotary hearth furnace, in iron vitriol slag, iron is mainly
With afe3(so4)2(oh)6Presented in, wherein a is one of k, na, has a small part to be znfe2O form exists, and zinc removes
A small amount of is existed with zinc ferrite form, most of presented in zinc sulfate and zinc silicate, lead and silver is all with sulfate
Form exists, in preheating zone, due to the heat radiation of middle warm area and high-temperature region, siderotil preheating zone can decompose generation water and
fe2o3, and in the removing along with the crystallization water in iron vitriol slag and the bed of material moisture evaporation, can also realize in preheating zone simultaneously
The preliminary reduction of zinc ferrite, with the rotation of rotary hearth furnace, material runs to middle warm area (middle warm area is provided with burner), due to pre-
The crystallization water in the compound of hot-zone and table water evaporation cause the mixing bed of material to form loose porous structure, and these loose structures improve
Dynamic conditions in course of reaction, is conducive to co in rotary hearth furnace strongly reducing atmosphere to enter inside pelletizing, is simultaneously also beneficial to
The volatilization of valuable metal lead zinc-silver, is reduced into metal in the compound of middle warm area lead zinc-silver, due to metallic lead, zinc, silver-colored steaming
Vapour pressure is very low, and highly volatile enters into flue, and the valuable metal entering flue is again oxidized, finally in the form of the oxide by
Dust arrester installation is collected, and obtains rich in silver, the zinc oxide fumes of lead valuable metal, that is, containing silver oxide, lead oxide and zinc oxide
Flue dust, and in middle warm area warm area except the reduction volatilization of lead zinc-silver valuable metal, the also preliminary reduction of ferriferous oxide, siderotil
Fe in slag2o3It is reduced into feo and least a portion of metallic iron, then material enters high-temperature region (high-temperature region setting storage by middle warm area
Hot type burner), ferriferous oxide carries out drastic reduction, obtains the metallization material of molten condition, in order to prevent fused materials and turn
Bottom stove bottom refractory sticks together, and in discharge zone, setting water cooling plant cools down to the metallization material of molten condition,
Then metallization material is made to discharge by spiral scraper.
Inventor finds, carries out decomposition-reduction process by iron vitriol slag siccative is mixed supply with coal dust to rotary hearth furnace,
In the preheating zone of rotary hearth furnace, siderotil decompose and zinc ferrite preliminary reduction, and the removing along with this crystallization water
With the evaporation of bed of material moisture, so that the mixing bed of material forms loose porous structure, and these loose structures improve reaction
During dynamic conditions, be conducive in rotary hearth furnace strongly reducing atmosphere carbon monoxide to enter inside the bed of material in middle warm area, thus
Not only improve iron lead silver-colored zinc reduction efficiency, and improve lead zinc-silver volatilization efficiency (extrusion rate of lead zinc-silver 95% with
On), realize the drastic reduction of ferriferous oxide simultaneously in high-temperature region, obtain the metallization material that degree of metalization reaches more than 88%,
And by arranging water cooling plant in discharge zone, cooling treatment is carried out to the metallization material of the molten condition obtained by high-temperature region,
The metallization material of molten state and rotary furnace bottom refractory material can be avoided to bond, thus ensureing smoothly going out of metal compound material
Material.
According to an embodiment of the present utility model, in feed zone, the thickness of feed layer of mixed material 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, feed zone
The thickness of feed layer of middle mixed material can be 40～65mm.Inventor finds, the too thick valuable metal of the bed of material should not volatilize, thus shadow
Ring the rate of recovery of lead zinc-silver, and the bed of material be too thin, production efficiency reduces, and the bed of material is too thin, leads to atmospheric condition in furnace chamber not good simultaneously,
It is easily caused material soft heat and be unfavorable for rotary hearth furnace spiral discharging.
According to further embodiment of the present utility model, feed zone and preheating zone are protected by middle warm area and high-temperature region heat radiation
Hold temperature at 600-900 DEG C, middle warm area is maintained at 900～1100 DEG C by burner control, and high-temperature region controls temperature by burner
It is maintained at 1100～1250 DEG C.Inventor finds, can be significantly better than other temperature conditionss and ensure that lead zinc-silver has at a temperature of being somebody's turn to do
Higher volatility and metallic iron have the higher rate of recovery.
According to another embodiment of the present utility model, the metallization material of molten condition fills through the water-cooled that discharge zone is arranged
The temperature postponing is 900～1000 degrees Celsius.Thus, it is possible to the metallization material being prevented effectively from molten state is resistance to rotary furnace bottom
Fiery material bonding, thus ensure the smooth discharging of metal compound material.
According to embodiment of the present utility model, mill ore magnetic selection device 400 has metallization material inlet 401, metal iron powder
Outlet 402 and tailings outlet 403, metallization material inlet 401 is connected with metallization material outlet 303, and is suitable to above-mentioned institute
The metallization material obtaining carries out mill ore magnetic selection, obtains metal iron powder and tailings.Specifically, by gained metallization material through cold
But, crush, levigate after carry out magnetic separation and process the separation that can achieve metal iron powder and tailings, and obtained metal iron powder
Grade reaches more than 88%, and iron recovery reaches more than 85%.
The system of the process iron vitriol slag according to the utility model embodiment passes through to mix iron vitriol slag siccative with coal dust supply
Carry out decomposition-reduction process to rotary hearth furnace, in the preheating zone of rotary hearth furnace, siderotil decompose and zinc ferrite preliminary reduction,
And the removing along with this crystallization water and the evaporation of bed of material moisture, so that the mixing bed of material forms loose porous knot
Structure, and these loose structures improve the dynamic conditions in course of reaction, are conducive to rotary hearth furnace strongly reducing atmosphere in middle warm area
Middle carbon monoxide enters inside the bed of material, thus not only improving the reduction efficiency of iron lead silver-colored zinc, and improves the volatilization of lead zinc-silver
Efficiency (extrusion rate of lead zinc-silver is more than 95%), realizes the drastic reduction of ferriferous oxide simultaneously, is metallized in high-temperature region
Rate reaches more than 88% metallization material, and by arranging water cooling plant to the molten obtained by high-temperature region in discharge zone
The metallization material of state carries out cooling treatment, and the metallization material of molten state and rotary furnace bottom refractory material can be avoided to glue
Knot, thus ensureing the smooth discharging of metal compound material, and then is separable to obtain metal iron powder (Iron grade reaches through mill ore magnetic selection
More than 88%), compared with the high temperature reduction volatility process adopting in prior art, the application passes through can significantly drop using rotary hearth furnace
Low energy consumption, and iron recovery up to more than 85%.Thus, iron vitriol slag bulk deposition is not only solved using the system of the application
The problem of pollution environment, and achieve the effective recycling of the valuable metals such as the iron lead zinc-silver in iron vitriol slag.
Understand for convenience, below with reference to Fig. 3, the system of the process iron vitriol slag using the utility model embodiment is implemented
The method processing iron vitriol slag is described in detail.According to embodiment of the present utility model, the method includes:
S100: iron vitriol slag is carried out drying and processing
In this step, iron vitriol slag is carried out drying and processing, obtain iron vitriol slag siccative.Specifically, in iron vitriol slag contain 22～
25% iron, and a large amount of valuable metals such as lead zinc-silver, have higher economic benefit.Concrete according to one of the present utility model
Embodiment, the water content in iron vitriol slag siccative can be 5～10wt%.Thus, going back of follow-up iron lead zinc-silver not only can be improved
Former efficiency, and can ensure that the preheating zone in rotary hearth furnace, mixing bed of material moisture evaporation so that the mixing bed of material formed loose porous
Structure, thus improving the volatility of lead zinc-silver.
S200: iron vitriol slag siccative is mixed with coal dust
In this step, iron vitriol slag siccative obtained above is mixed with coal dust, is obtained mixed material.Specifically, may be used
To realize the mixing of iron vitriol slag siccative and coal dust using spiral distributor.
According to an embodiment of the present utility model, iron vitriol slag siccative is not particularly restricted with the mixed proportion of coal dust,
Those skilled in the art can be selected according to actual needs, according to a specific embodiment of the present utility model, coal dust with
Iron vitriol slag siccative can be mixed for 1.6～2.0 according to carbon-to-oxygen ratio.Inventor finds, if coal dust addition is too low, leads to also
Former can not thoroughly carry out, thus reducing the rate of recovery of iron lead zinc-silver, and if coal dust addition is too high, carbon therein can not fire completely
Burn, lead to the product carbon content that reduction roasting terminates to obtain to raise.
According to further embodiment of the present utility model, the particle diameter of coal dust 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, the particle diameter of coal dust can for 0.5～
1mm.Inventor finds, if coal particle size excessively thick so that iron vitriol slag is insufficient contact with coal dust and affect sequential reduction effect, and
If coal dust is meticulous, in rotary hearth furnace, easy airborne dust, causes the loss of coal dust.
S300: mixed material is supplied feed zone to rotary hearth furnace so that mixed material sequentially passes through the preheating of rotary hearth furnace
Area, middle warm area and high-temperature region carry out decomposition-reduction
In this step, mixed material obtained above is supplied the feed zone to rotary hearth furnace, in iron vitriol slag, iron is mainly
With afe3(so4)2(oh)6Presented in, wherein a is one of k, na, has a small part to be znfe2O form exists, and zinc removes
A small amount of is existed with zinc ferrite form, most of presented in zinc sulfate and zinc silicate, lead and silver is all with sulfate
Form exists, in preheating zone, due to the heat radiation of middle warm area and high-temperature region, siderotil preheating zone can decompose generation water and
fe2o3, and in the removing along with the crystallization water in iron vitriol slag and the bed of material moisture evaporation, can also realize in preheating zone simultaneously
The preliminary reduction of zinc ferrite, with the rotation of rotary hearth furnace, material runs to middle warm area (middle warm area is provided with burner), due to pre-
The crystallization water in the compound of hot-zone and table water evaporation cause the mixing bed of material to form loose porous structure, and these loose structures improve
Dynamic conditions in course of reaction, is conducive to co in rotary hearth furnace strongly reducing atmosphere to enter inside pelletizing, is simultaneously also beneficial to
The volatilization of valuable metal lead zinc-silver, is reduced into metal in the compound of middle warm area lead zinc-silver, due to metallic lead, zinc, silver-colored steaming
Vapour pressure is very low, and highly volatile enters into flue, and the valuable metal entering flue is again oxidized, finally in the form of the oxide by
Dust arrester installation is collected, and obtains rich in silver, the zinc oxide fumes of lead valuable metal, that is, containing silver oxide, lead oxide and zinc oxide
Flue dust, and in middle warm area warm area except the reduction volatilization of lead zinc-silver valuable metal, the also preliminary reduction of ferriferous oxide, siderotil
Fe in slag2o3It is reduced into feo and least a portion of metallic iron, then material enters high-temperature region (high-temperature region setting storage by middle warm area
Hot type burner), ferriferous oxide carries out drastic reduction, obtains the metallization material of molten condition, in order to prevent fused materials and turn
Bottom stove bottom refractory sticks together, and in discharge zone, setting water cooling plant cools down to the metallization material of molten condition,
Then metallization material is made to discharge by spiral scraper.
Inventor finds, carries out decomposition-reduction process by iron vitriol slag siccative is mixed supply with coal dust to rotary hearth furnace,
In the preheating zone of rotary hearth furnace, siderotil decompose and zinc ferrite preliminary reduction, and the removing along with this crystallization water
With the evaporation of bed of material moisture, so that the mixing bed of material forms loose porous structure, and these loose structures improve reaction
During dynamic conditions, be conducive in rotary hearth furnace strongly reducing atmosphere carbon monoxide to enter inside the bed of material in middle warm area, thus
Not only improve iron lead silver-colored zinc reduction efficiency, and improve lead zinc-silver volatilization efficiency (extrusion rate of lead zinc-silver 95% with
On), realize the drastic reduction of ferriferous oxide simultaneously in high-temperature region, obtain the metallization material that degree of metalization reaches more than 88%,
And by arranging water cooling plant in discharge zone, cooling treatment is carried out to the metallization material of the molten condition obtained by high-temperature region,
The metallization material of molten state and rotary furnace bottom refractory material can be avoided to bond, thus ensureing smoothly going out of metal compound material
Material.
According to an embodiment of the present utility model, in feed zone, the thickness of feed layer of mixed material 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, feed zone
The thickness of feed layer of middle mixed material can be 40～65mm.Inventor finds, the too thick valuable metal of the bed of material should not volatilize, thus shadow
Ring the rate of recovery of lead zinc-silver, and the bed of material be too thin, production efficiency reduces, and the bed of material is too thin, leads to atmospheric condition in furnace chamber not good simultaneously,
It is easily caused material soft heat and be unfavorable for rotary hearth furnace spiral discharging.
According to further embodiment of the present utility model, feed zone and preheating zone are protected by middle warm area and high-temperature region heat radiation
Hold temperature at 600-900 DEG C, middle warm area is maintained at 900～1100 DEG C by burner control, and high-temperature region controls temperature by burner
It is maintained at 1100～1250 DEG C.Inventor finds, can be significantly better than other temperature conditionss and ensure that lead zinc-silver has at a temperature of being somebody's turn to do
Higher volatility and metallic iron have the higher rate of recovery.
According to another embodiment of the present utility model, the metallization material of molten condition fills through the water-cooled that discharge zone is arranged
The temperature postponing is 900～1000 degrees Celsius.Thus, it is possible to the metallization material being prevented effectively from molten state is resistance to rotary furnace bottom
Fiery material bonding, thus ensure the smooth discharging of metal compound material.
S400: the metallization material that discharge zone is discharged carries out mill ore magnetic selection process
In this step, above-mentioned obtained metallization material is carried out mill ore magnetic selection, obtains metal iron powder and tailings.Specifically
, will gained metallize material cooled, broken, levigate after carry out magnetic separation process can achieve metal iron powder and tailings point
From, and the grade of obtained metal iron powder reaches more than 88%, and iron recovery reaches more than 85%.
The method of the process iron vitriol slag according to the utility model embodiment passes through to mix iron vitriol slag siccative with coal dust supply
Carry out decomposition-reduction process to rotary hearth furnace, in the preheating zone of rotary hearth furnace, siderotil decompose and zinc ferrite preliminary reduction,
And the removing along with this crystallization water and the evaporation of bed of material moisture, so that the mixing bed of material forms loose porous knot
Structure, and these loose structures improve the dynamic conditions in course of reaction, are conducive to rotary hearth furnace strongly reducing atmosphere in middle warm area
Middle carbon monoxide enters inside the bed of material, thus not only improving the reduction efficiency of iron lead silver-colored zinc, and improves the volatilization of lead zinc-silver
Efficiency (extrusion rate of lead zinc-silver is more than 95%), realizes the drastic reduction of ferriferous oxide simultaneously, is metallized in high-temperature region
Rate reaches more than 88% metallization material, and by arranging water cooling plant to the molten obtained by high-temperature region in discharge zone
The metallization material of state carries out cooling treatment, and the metallization material of molten state and rotary furnace bottom refractory material can be avoided to glue
Knot, thus ensureing the smooth discharging of metal compound material, and then is separable to obtain metal iron powder (Iron grade reaches through mill ore magnetic selection
More than 88%), compared with the high temperature reduction volatility process adopting in prior art, the application passes through can significantly drop using rotary hearth furnace
Low energy consumption, and iron recovery up to more than 85%.Thus, not only solve iron vitriol slag bulk deposition using the present processes
The problem of pollution environment, and achieve the effective recycling of the valuable metals such as the iron lead zinc-silver in iron vitriol slag.
As described above, according to the utility model embodiment process iron vitriol slag method can have the advantages that selected from following extremely
One of few:
The method of the process iron vitriol slag according to the utility model embodiment enters furnace technology using powder, saves briquetting program,
Cost-effective.
The method of the process iron vitriol slag according to the utility model embodiment realizes iron vitriol slag and reduction by self-conveyor feed
The mixing of agent coal dust, such that it is able to avoid powder blocking burner.
The method of the process iron vitriol slag according to the utility model embodiment is processed to iron vitriol slag using rotary hearth furnace, relatively
Process iron vitriol slag in rotary kiln, the amount of allocating that rotary hearth furnace processes siderotil dross coal decreases 70-80%, and economic benefit is obvious.
The method of the process iron vitriol slag according to the utility model embodiment makes compound shape in the dehydration of preheating zone
The a large amount of open structures becoming improve dynamic conditions, are conducive to the removing of valuable metal simultaneously, the removal efficiency of lead zinc up to
More than 90%, the removal efficiency more than 89% of silver.
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
All iron content 22wt% in iron vitriol slag, Zn content 4wt%, lead content 3wt%, silver content 180g/t, first by iron
It is 5wt% that alum slag is dried to water content, is then joined obtained iron vitriol slag siccative and carbon dust according to carbon-to-oxygen ratio 1.6
Material, wherein, the particle diameter of coal dust is 0.5～1mm, supplies to rotary hearth furnace, keep the feed zone bed of material after being mixed by screw feeder
Thickness 40mm about, with furnace bottom rotation, mixed material enters into preheating zone by feed zone, and middle warm area and high temperature are passed through in preheating zone
The thermal radiation temperature in area is maintained at 800～900 DEG C, and in preheating zone, iron vitriol slag decomposes generation fe2o3, slough thing in preheating zone simultaneously
Moisture in material, in rotary hearth furnace, warm area is maintained at 950 ± 10 DEG C by burner temperature, and middle warm area zinc ferrite is reduced generation metal
Zinc, the compound of lead sulfate and silver is reduced by heat resolve and generates metallic lead and silver, after the volatilization of these valuable metals again
Oxidized, and be collected in the form of an oxide, obtain the dust containing silver oxide, lead oxide and zinc oxide, wherein in dust
The grade of zinc oxide reaches more than 62%, and silver content is 2200g/t, and in the metallized pellet obtaining, the removal efficiency of lead zinc is respectively
95.51% and 96.42%, the removal efficiency of silver is 94.36%, and high-temperature region controls temperature to be 1210 ± 10 DEG C by burner, at this
Area realizes the drastic reduction of iron, obtains the metallization material of degree of metalization 84%, and the material that metallizes entered the water of discharge zone
Device for cooling is cooled to 900-1000 DEG C, and discharges rotary hearth furnace by spiral material scraper, and the metallization material obtaining passes through ore grinding
Magnetic separation can obtain Iron grade 86%, the metal iron powder of the rate of recovery 80%.
Embodiment 2
All iron content 22wt% in iron vitriol slag, Zn content 4wt%, lead content 3wt%, silver content 180g/t, first by iron
It is 5wt% that alum slag is dried to water content, is then joined obtained iron vitriol slag siccative and carbon dust according to carbon-to-oxygen ratio 1.6
Material, wherein, the particle diameter of coal dust is 0.5～1mm, supplies to rotary hearth furnace, keep the feed zone bed of material after being mixed by screw feeder
Thickness 65mm about, with furnace bottom rotation, mixed material enters into preheating zone by feed zone, and middle warm area and high temperature are passed through in preheating zone
The thermal radiation temperature in area is maintained at 800～900 DEG C, and in preheating zone, iron vitriol slag decomposes generation fe2o3, slough thing in preheating zone simultaneously
Moisture in material, in rotary hearth furnace, warm area is maintained at 950 ± 10 DEG C by burner temperature, and middle warm area zinc ferrite is reduced generation metal
Zinc, the compound of lead sulfate and silver is reduced by heat resolve and generates metallic lead and silver, after the volatilization of these valuable metals again
Oxidized, and be collected in the form of an oxide, obtain the dust containing silver oxide, lead oxide and zinc oxide, wherein in dust
The grade of zinc oxide reaches more than 62%, and silver content is 1800g/t, and in the metallized pellet obtaining, the removal efficiency of lead zinc is respectively
90.63% and 91.58%, the removal efficiency of silver is 88.25%, and high-temperature region controls temperature to be 1210 ± 10 DEG C by burner, at this
Area realizes the drastic reduction of iron, obtains the metallization material of degree of metalization 83%, and the material that metallizes entered the water of discharge zone
Device for cooling is cooled to 900-1000 DEG C, and discharges rotary hearth furnace by spiral material scraper, and the metallization material obtaining passes through ore grinding
Magnetic separation can obtain Iron grade 84%, the metal iron powder of the rate of recovery 79%.
Embodiment 3
In iron vitriol slag, iron vitriol slag is dried by full iron 25%, Zn content 7%, lead content 5%, silver content 220g/t first
Doing to water content is 10wt%, then according to carbon-to-oxygen ratio 2.0, obtained iron vitriol slag siccative and carbon dust is carried out dispensing, wherein,
The particle diameter of coal dust is 0.5～1mm, supplies to rotary hearth furnace, keep feed zone thickness of feed layer 55mm after being mixed by screw feeder
Left and right, with furnace bottom rotation, mixed material enters into preheating zone by feed zone, and the hot spoke of middle warm area and high-temperature region is passed through in preheating zone
Penetrate temperature and be maintained at 800～900 DEG C, in preheating zone, iron vitriol slag decomposes generation fe2o3, slough the water in material in preheating zone simultaneously
Point, in rotary hearth furnace, warm area is maintained at 950 ± 10 DEG C by burner temperature, and middle warm area zinc ferrite is reduced generation metallic zinc, sulfuric acid
The compound of lead and silver is reduced by heat resolve and generates metallic lead and silver, again oxidized after the volatilization of these valuable metals,
And it is collected in the form of an oxide, obtain the dust containing silver oxide, lead oxide and zinc oxide, zinc oxide wherein in dust
Grade reaches more than 63%, and silver content is 2400g/t, and in the metallized pellet obtaining, the removal efficiency of lead zinc is respectively 93.27% He
93.88%, the removal efficiency of silver is 93.17%, and high-temperature region controls temperature to be 1230 ± 10 DEG C by burner, realizes iron in this area
Drastic reduction, obtains the metallization material of degree of metalization 86%, and the material that metallizes entered the water cooling plant cooling of discharge zone
To 900-1000 DEG C, and rotary hearth furnace is discharged by spiral material scraper, the metallization material obtaining can obtain by mill ore magnetic selection
To Iron grade 87%, the metal iron powder of the rate of recovery 82%.
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 iron vitriol slag is it is characterised in that include:
Drying unit, described drying unit has iron vitriol slag entrance and iron vitriol slag drier outlet；
Mixing arrangement, described mixing arrangement has iron vitriol slag siccative entrance, coal powder entrance and mixed material outlet, described iron vitriol slag
Siccative entrance is connected with described iron vitriol slag drier outlet；
Rotary hearth furnace, described rotary hearth furnace sequentially forms feed zone, preheating zone, middle warm area, high-temperature region along furnace bottom rotation direction and goes out
Material area, described feed zone is provided with mixed material entrance, and described middle warm area is provided with flue dust outlet, described middle warm area and described height
Warm area is respectively arranged with burner, and described discharge zone is provided with water cooling plant, metallization material outlet and spiral scraper, described mixed
Close material inlet to be connected with the outlet of described mixed material；
Mill ore magnetic selection device, described mill ore magnetic selection device has metallization material inlet, metal iron powder outlet and tailings outlet, institute
State metallization material inlet to be connected with described metallization material outlet.
2. system according to claim 1 is it is characterised in that described mixing arrangement is spiral distributor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620830515.9U CN205907331U (en) | 2016-08-01 | 2016-08-01 | System for handle siderotil sediment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620830515.9U CN205907331U (en) | 2016-08-01 | 2016-08-01 | System for handle siderotil sediment |
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| CN201620830515.9U Expired - Fee Related CN205907331U (en) | 2016-08-01 | 2016-08-01 | System for handle siderotil sediment |
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