CN105671328B - Handle the rotary hearth furnace and method of lead and zinc smelting dreg - Google Patents
Handle the rotary hearth furnace and method of lead and zinc smelting dreg Download PDFInfo
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- CN105671328B CN105671328B CN201610178955.5A CN201610178955A CN105671328B CN 105671328 B CN105671328 B CN 105671328B CN 201610178955 A CN201610178955 A CN 201610178955A CN 105671328 B CN105671328 B CN 105671328B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of rotary hearth furnace and method for handling lead and zinc smelting dreg, the rotary hearth furnace includes：Rotatable stove bottom；Smelting space is limited in annular furnace, the burner hearth that goes in ring, and along the circumference of annular furnace, will smelt space successively by the entrance region of material and be divided into feed zone, preheating zone, resolver, volatilization area, reducing zone and discharge zone；First partition wall, the first partition wall is arranged between feed zone and preheating zone；Second partition wall, the second partition wall is arranged between volatilization area and reducing zone；3rd partition wall, the 3rd partition wall is arranged between reducing zone and discharge zone；First heating unit, the first heating unit is arranged in resolver；And second heating unit, the second heating unit is arranged in the reducing zone.The rotary hearth furnace can solve valuable element in lead and zinc smelting dreg in the prior art and be unable to the problem of synthetical recovery, and can realize that the valuable elements such as iron in lead and zinc smelting dreg, lead, zinc, indium, sulphur are recovered in the same apparatus.
Description
Technical field
The invention belongs to metallurgical technology field, specifically, the present invention relates to a kind of rotary hearth furnace for handling lead and zinc smelting dreg
And method.
Background technology
Lead and zinc are the important meals materials that can not lack during the national economic development, in industrial production and human being's production
In be widely used.In recent years, Lead-zinc Smelting Enterprises development was swift and violent, and China has become global most important lead-zinc production state
One of.
China's Lead-zinc Smelting Enterprises scale and quantity expand year by year, and lead zinc yield quickly increases, and smelting technique obtains huge
Progress.But, lead-zinc smelting technological process is complicated, and the link that pollutant is produced is more.The fast development of lead-zinc smelting, causes big
The waste gas of amount, sewage, the generation of waste residue (such as Lead Smelting in Blast Furnace slag, jarosite slag), cause serious environmental pollution.Its
In, the yield of waste residue is more.According to the National Development and Reform Commission《Big-and-middle solid waste utilizes embodiment》In system
Meter, China is about 3.15 hundred million tons in the melting waste slag amount of output in 2010, wherein the yield of only lead and zinc smelting dreg just reaches
4,300,000 tons.
Lead and zinc smelting dreg is rich in metallic iron, the rare precious metal such as gallium, indium, gold and silver, also containing toxic elements such as lead, cadmium, arsenic
And the strong metal of migration.Substantial amounts of lead and zinc smelting dreg using it is traditional it is any topple over, the outdoor place banked up or simply filled
Reason mode, takes the soil of large area, causes land resource in short supply.Over time, because weathering and rainwater are rushed
Metallic element meeting invading air, water body and soil in the effect of brush, lead and zinc smelting dreg, as important pollution sources.If do not entered
Row is rational to be reclaimed and utilizes, and not only jeopardizes the health of human and animal, the growth of influence plant and vegetation, and cause valuable
The waste of metals resources.
Therefore, the treatment technology of lead and zinc smelting dreg needs further to be probed into.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is the rotary hearth furnace and method for proposing a kind of processing lead and zinc smelting dreg, and the rotary hearth furnace can solve lead in the prior art
Valuable element is unable to the problem of synthetical recovery in zinc smelting dreg, and can realize iron in lead and zinc smelting dreg, lead, zinc, indium, sulphur etc.
Valuable element is recovered in the same apparatus.
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace for handling lead and zinc smelting dreg.According to the present invention
Embodiment, the rotary hearth furnace includes；
Rotatable stove bottom；
Smelting space is limited in annular furnace, the belt burner hearth, and along the circumference of the annular furnace, by thing
The smelting space is divided into feed zone, preheating zone, resolver, volatilization area, reducing zone successively and gone out by the entrance region of material
Expect area；
First partition wall, first partition wall is arranged between feed zone and preheating zone；
Second partition wall, second partition wall is arranged between volatilization area and reducing zone；
3rd partition wall, the 3rd partition wall is arranged between reducing zone and discharge zone；
First heating unit, first heating unit is arranged in the resolver；And
Second heating unit, second heating unit is arranged in the reducing zone.
Thus, the rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention by will smelting space be divided into
Expect area, preheating zone, resolver, volatilization area, reducing zone and discharge zone so that in lead and zinc smelting dreg element sulphur in resolver to vulcanize
Thing form is recovered, and lead, zinc, the phosphide element quilt in the form of lead oxide, zinc oxide and indium oxide in the flue in volatilization area
Reclaim, and ferro element therein is recycled in reducing zone with being present in the form of fe in metallized pellet, so as to solve
Valuable element in lead-zinc smelting slag in the prior art of having determined is unable to the problem of synthetical recovery, and then solves due to lead and zinc smelting dreg
Can not utilize and cause the waste problem of valuable resource, at the same by using rotary hearth furnace can realize iron in lead and zinc smelting dreg, lead,
The valuable elements such as zinc, indium, sulphur are recovered in the same apparatus, so as to significantly reduce equipment investment cost, and then are improved
The economic benefit of enterprise.
In addition, the rotary hearth furnace of processing lead and zinc smelting dreg according to the above embodiment of the present invention can also have what is added as follows
Technical characteristic：
In some embodiments of the invention, first heating unit is arranged to be suitable to the temperature of the resolver
Control is at 800~1220 degrees Celsius, and second heating unit is arranged to be suitable to exist the temperature control of the reducing zone
1200~1350 degrees Celsius.Thus, it is possible to significantly improve the rate of recovery of valuable element.
In some embodiments of the invention, first heating unit includes non-heat-accumulating burner.Thus, it is possible to enter one
Step improves the rate of recovery of valuable element.
In some embodiments of the invention, second heating unit includes non-heat-accumulating burner and heat-accumulating burner.
Thus, it is possible to significantly improve the rate of recovery of metallic iron.
In some embodiments of the invention, in the reducing zone, in circumferential direction, along furnace bottom rotation direction, institute
State the downstream that heat-accumulating burner is arranged on the non-heat-accumulating burner.Thus, it is possible to further improve the rate of recovery of metallic iron.
In some embodiments of the invention, the rotary hearth furnace of the processing lead and zinc smelting dreg further comprises：First flue,
First flue is arranged in the volatilization area；And second flue, second flue is arranged on the reducing zone.By
This, can further improve the rate of recovery of valuable element.
In the second aspect of the invention, the present invention proposes a kind of method for handling lead and zinc smelting dreg.According to the present invention
Embodiment, this method is carried out using the rotary hearth furnace of above-mentioned processing lead and zinc smelting dreg.According to the specific implementation of the present invention
Example, this method includes：
(1) make the pelletizing containing lead and zinc smelting dreg and reducing agent via the feed zone into the preheating zone, and
The preheating zone carries out the pre-heat treatment, so that the crystallization water volatilization in the pelletizing, wherein, the lead and zinc smelting dreg contains
Sulfate；
(2) material obtained by making in step (1) enters the resolver, and makes the sulfate in the resolver
Sulfide and metal oxide are decomposed into, the metal oxide includes lead oxide, zinc oxide, indium oxide and iron oxide；
(3) material obtained by making in step (2) enters the volatilization area, and makes lead oxide, oxygen in the volatilization area
Change zinc and indium oxide and be reduced to metallic lead, zinc and indium in the presence of the reducing agent, and reclaim the metallic lead, zinc and
Indium；
(4) material obtained by making in step (3) enters reducing zone, and makes the iron oxide in institute in the reducing zone
State and be reduced to fe in the presence of reducing agent, to obtain metallized pellet；And
(5) metallized pellet is reclaimed in the discharge zone.
Thus, the method for processing lead and zinc smelting dreg according to embodiments of the present invention is divided into charging by will smelt space
Area, preheating zone, resolver, volatilization area, reducing zone and discharge zone so that in lead and zinc smelting dreg element sulphur in resolver with sulfide
Form is recovered, and lead, zinc, phosphide element are returned in the flue in volatilization area in the form of lead oxide, zinc oxide and indium oxide
Receive, and ferro element therein is recycled in reducing zone with being present in the form of fe in metallized pellet, so as to solve
Valuable element is unable to the problem of synthetical recovery in lead-zinc smelting slag in the prior art, so solve due to lead and zinc smelting dreg without
Method utilize and cause the waste problem of valuable resource, while by using rotary hearth furnace can realize iron in lead and zinc smelting dreg, lead,
The valuable elements such as zinc, indium, sulphur are recovered in the same apparatus, so as to significantly reduce equipment investment cost, and then are improved
The economic benefit of enterprise.
In addition, the method for processing lead and zinc smelting dreg according to the above embodiment of the present invention can also have skill additional as follows
Art feature：
In some embodiments of the invention, in step (3), the metallic lead, zinc are reclaimed using first flue
And indium.Thus, it is possible to significantly improve the high efficiente callback of lead in lead and zinc smelting dreg, zinc and indium valuable element.
In some embodiments of the invention, the temperature of the preheating zone is 500~700 degrees Celsius, the resolver
Temperature is 800~1220 degrees Celsius, and the temperature in the volatilization area is 800~1000 degrees Celsius, and the temperature of the reducing zone is
1200~1350 degrees Celsius.Thus, it is possible to further improve the rate of recovery of valuable element.
In some embodiments of the invention, the method for the processing lead and zinc smelting dreg further comprises：(6) ore grinding is passed through
Magnetic selection method separates elemental metals iron from the metallized pellet.
In some embodiments of the invention, in step (3), further comprise reclaiming sulfur-bearing by first flue
Flue gas, and by the sulfur-containing smoke gas for preparing sulfuric acid.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the overlooking the structure diagram of the rotary hearth furnace of processing lead and zinc smelting dreg according to an embodiment of the invention；
Fig. 2 is the method flow schematic diagram of processing lead and zinc smelting dreg according to an embodiment of the invention；
Fig. 3 is the method flow schematic diagram of the processing lead and zinc smelting dreg according to further embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In one aspect of the invention, the invention discloses a kind of rotary hearth furnace for handling lead and zinc smelting dreg.With reference to Fig. 1, root
Rotary hearth furnace according to the processing lead and zinc smelting dreg of the embodiment of the present invention includes：Rotatable stove bottom 100, annular furnace 200, the first partition wall
300th, the second partition wall 400, the 3rd partition wall 500, the first heating unit 600 and the second heating unit 700.
Smelting space (not shown) is limited in embodiments in accordance with the present invention, annular furnace 200, and along annular furnace
The circumference of thorax 200, by material entrance region successively will smelt space be divided into feed zone 21, preheating zone 22, resolver 23,
Volatilize area 24, reducing zone 25 and discharge zone 26, and be adapted so that the pelletizing containing lead and zinc smelting dreg and reducing agent sequentially pass through into
Material area 21, preheating zone 22, resolver 23, volatilization area 24, reducing zone 25 and discharge zone 26 occur pre- thermal response, decomposition reaction, waved
Hair reaction and reduction reaction, so as to obtain sulfide, metallic zinc, metallic lead, indium metal and metallization containing fe
Pelletizing.
Embodiments in accordance with the present invention, the first partition wall 300 is arranged between feed zone 21 and preheating zone 22, and suitable for that will enter
Material area and preheating zone are separated, and only retain the distance that material passes through between the minimum point and furnace bottom of the first partition wall.
Embodiments in accordance with the present invention, the second partition wall 400 is arranged between volatilization area 24 and reducing zone 25, and suitable for that will wave
Hair area and reducing zone are separated, and only retain the distance that material passes through between the minimum point and furnace bottom of the second partition wall.
Embodiments in accordance with the present invention, the 3rd partition wall 500 is arranged between reducing zone 25 and discharge zone 26, and suitable for that will go back
Former area and discharge zone are separated, and only retain the distance that material passes through between the minimum point and furnace bottom of the 3rd partition wall.
Embodiments in accordance with the present invention, the first heating unit 600 is arranged in resolver 23, and is suitable for the He of preheating zone 22
Resolver 23 provides heat and causes the pelletizing containing lead and zinc smelting dreg and reducing agent to carry out the pre-heat treatment first in preheating zone, from
And cause the crystallization water volatilization in pelletizing, and due to the crystallization water containing 30wt% or so in lead and zinc smelting dreg, if pelletizing is directly
Pyrolysis zone is carried out, pelletizing can be caused to burst, then with the rotation of rotary furnace bottom, the pelletizing after preheating, which enters, to be decomposed
Area so that the sulphate decomposition contained in lead and zinc smelting dreg is sulfide (sulfur dioxide and sulfur trioxide) and metal oxide
(lead oxide, zinc oxide, indium oxide and iron oxide), wherein, sulfide enters volatilization area in flue gas form.
According to the specific embodiment of the present invention, the first heating unit is arranged to be suitable to the temperature control of resolver
At 800~1220 degrees Celsius, and according to rotary hearth furnace direction of rotation, the temperature of resolver gradually rises, i.e., anterior in resolver
Temperature is less than rear part temperature in resolver.Inventor has found that the temperature range can ensure that the sulfate in lead cadmia fully divides
Solution, obtains the mixed sulfides flue gas of sulfur dioxide and sulfur trioxide, and lead oxide, zinc oxide, indium oxide and iron oxide are present
In pelletizing.
According to another specific embodiment of the present invention, the particular type of the first heating unit is not particularly restricted, this
Art personnel can be selected according to actual needs, and according to the specific example of the present invention, the first heating unit can be
Non- heat-accumulating burner, i.e., common burner.Specifically, preheating zone is not provided with burner, the heat spoke of common burner in resolver is utilized
Penetrating makes temperature in preheating zone be 500~700 degrees Celsius, so as to be carried out to the pelletizing containing lead and zinc smelting dreg and reducing agent at preheating
Reason, removes the crystallization water in pelletizing.
According to another specific embodiment of the present invention, burner is not provided with volatilization area, but utilize hot cigarette in resolver
Flow of air is by the temperature control in area of volatilizing in 800~1000 degrees Celsius, the lead oxide obtained in resolver, zinc oxide and oxygen
Change indium is reduced into metallic lead, zinc, indium under carbonaceous reducing agent effect and entered in the first flue 800 being arranged in volatilization area,
Deposition is oxidized in the first flue, so as to reclaim lead oxide, zinc oxide and indium oxide dust, and then realize valuable element lead,
The synthetical recovery of zinc and indium.Specifically, being not provided with partition wall, and resolver and volatilization between preheating zone, resolver and volatilization area
Area shares an exit flue, i.e. the first flue.
Embodiments in accordance with the present invention, the second heating unit 700 is arranged on reducing zone 25, and is suitable for reducing zone 25 and provides
Heat, so that the oxidation in the pelletizing containing iron oxide that volatilization area is obtained carries out reduction reaction, pelletizing in reducing zone
Iron, into fe, obtains metallized pellet and reduction tail gas by carbonaceous reducing agent, and wherein metallized pellet goes out through discharge zone
Mill ore magnetic selection system is delivered to after stove and isolates metallic iron and tailings, and reduces configured the second flue 900 in reducing zone of tail gas
Come out of the stove.
According to the specific embodiment of the present invention, the second heating unit 700 is arranged to be suitable to the temperature of reducing zone 25
Degree control is filled at 1200~1350 degrees Celsius so as to the iron oxide that ensures in the pelletizing containing iron oxide by carbonaceous reducing agent
Divide and be reduced to metallic iron.
According to another specific embodiment of the present invention, the particular type of the second heating unit 700 is not particularly restricted,
Those skilled in the art can be selected according to actual needs, and according to the specific example of the present invention, the second heating unit 700 can
Think non-heat-accumulating burner 71 and heat-accumulating burner 72, and in reducing zone, in circumferential direction, along furnace bottom rotation direction,
Heat-accumulating burner is arranged on the downstream of non-heat-accumulating burner, so that the reduction efficiency of iron oxide can be not only significantly improved, and
The utilization ratio of heat can fully be improved.
Carried out specifically, the pelletizing containing lead and zinc smelting dreg and reducing agent is entered into preheating zone via feed zone at preheating
Reason so that the crystallization water in pelletizing is able to volatilization removing, and configured the first flue discharge in volatilization area, and with rotary hearth furnace
Rotation, the pelletizing after the removing crystallization water enters resolver, and sulphate decomposition therein is that sulfide flue gas (contains sulfur dioxide
And sulfur trioxide) and lead oxide, indium oxide, zinc oxide and iron oxide, the sulfide flow of flue gas extremely volatilization area of generation is to waving
Hair area heated, and will be arranged on volatilization area the first flue discharge after deliver to system for preparing sulfuric acid reclaim sulphur, and containing aoxidize
Lead, indium oxide, the pelletizing of zinc oxide and iron oxide enter volatilization area, lead oxide therein, zinc oxide and indium oxide in carbonaceous also
Metallic lead, metallic zinc and indium metal are reduced in the presence of former agent, metallic lead, metallic zinc and indium metal are volatized into the first cigarette
In road, and it is recovered after being oxidized to zinc oxide, lead oxide and indium oxide in the first flue, and enters containing iron oxide in pelletizing
Enter reducing zone iron oxide therein in the presence of carbonaceous reducing agent and be reduced to metallic iron, obtain metallized pellet, and obtain
The reduction tail gas arrived is discharged through the second flue, and metallized pellet delivers to mill ore magnetic selection system and isolates gold after being come out of the stove through discharge zone
Belong to iron and tailings.
The rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention by will smelting space be divided into feed zone,
Preheating zone, resolver, volatilization area, reducing zone and discharge zone so that in lead and zinc smelting dreg element sulphur in resolver with sulfide shape
Formula is recovered, and lead, zinc, phosphide element are recovered in the flue in volatilization area in the form of lead oxide, zinc oxide and indium oxide,
And ferro element therein is recycled in reducing zone with being present in the form of fe in metallized pellet, so as to solve existing
Have in technology that valuable element is unable to the problem of synthetical recovery in lead-zinc smelting slag, and then solve because lead and zinc smelting dreg can not profit
With and cause the waste problem of valuable resource, while by using rotary hearth furnace can realize iron in lead and zinc smelting dreg, lead, zinc, indium,
The valuable elements such as sulphur are recovered in the same apparatus, so as to significantly reduce equipment investment cost, and then improve enterprise
Economic benefit.
As described above, the rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention can have the advantages that to be selected from it is following
At least one：
The rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention can solve valuable element in lead and zinc smelting dreg
The problem of being unable to synthetical recovery, and the valuable element such as iron, lead, zinc, indium, sulphur in lead cadmia can be reclaimed within one device；
The rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention can be such that sulphur in lead and zinc smelting dreg first resolves into
Sulfur oxide is carried out setting up the recovery that flue carries out oxysulfide in reduction furnace front portion, and the processing of flue gas can be reduced by individually reclaiming
Process and the sulphur product for obtaining high-grade high-recovery；
The rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention is not separately provided burning in preheating zone and volatilization area
Mouth, using the heat of resolver, improves stove heat utilization efficiency；
The rotary hearth furnace of processing lead and zinc smelting dreg according to embodiments of the present invention sets heat-accumulating burner at reducing zone rear portion, has
Effect improves the temperature of reducing zone, promotes the reduction of ferriferous oxide, the reducting pellet of high metal rate is provided for follow-up slag sluicing system.
In the second aspect of the invention, the present invention proposes a kind of method for handling lead and zinc smelting dreg.According to the present invention
Embodiment, this method is carried out using the rotary hearth furnace of above-mentioned processing lead and zinc smelting dreg.The present invention is implemented below with reference to Fig. 2
The method of the processing lead and zinc smelting dreg of example is described in detail.Embodiments in accordance with the present invention, this method includes：
S100：The pelletizing containing lead and zinc smelting dreg and reducing agent is set to enter preheating zone via feed zone
Embodiments in accordance with the present invention, make the pelletizing containing lead and zinc smelting dreg and reducing agent enter preheating zone via feed zone
The pre-heat treatment is carried out, so that the crystallization water volatilization in pelletizing, and due to the knot containing 30wt% or so in lead and zinc smelting dreg
Brilliant water, if pelletizing directly carries out pyrolysis zone, can cause pelletizing to burst.It should be noted that those skilled in the art can be with
The particular type of reducing agent and the binding agent of pelletizing is selected according to actual needs, for example reducing agent can be carbonaceous reduction
Agent.
S200：The material obtained by step S100 is set to enter resolver
Embodiments in accordance with the present invention, with the rotation of rotary furnace bottom, the pelletizing after preheating enters resolver so that lead
The sulphate decomposition contained in zinc smelting dreg is sulfide (sulfur dioxide and sulfur trioxide) and metal oxide (lead oxide, oxygen
Change zinc, indium oxide and iron oxide), wherein, sulfide enters volatilization area in flue gas form.
According to the specific embodiment of the present invention, the temperature control of resolver is existed by using the first heating unit
800~1220 degrees Celsius, and according to rotary hearth furnace direction of rotation, the temperature of resolver gradually rises, i.e., anterior temperature in resolver
Degree is less than rear part temperature in resolver.Inventor has found that the temperature range can ensure that the sulfate in lead cadmia is fully decomposed,
The mixed sulfides flue gas of sulfur dioxide and sulfur trioxide is obtained, and lead oxide, zinc oxide, indium oxide and iron oxide are present in ball
In group.
According to another specific embodiment of the present invention, the particular type of the first heating unit is not particularly restricted, this
Art personnel can be selected according to actual needs, and according to the specific example of the present invention, the first heating unit can be
Non- heat-accumulating burner, i.e., common burner.Specifically, preheating zone is not provided with burner, the heat spoke of common burner in resolver is utilized
Penetrating makes temperature in preheating zone be 500~700 degrees Celsius, so as to be carried out to the pelletizing containing lead and zinc smelting dreg and reducing agent at preheating
Reason, removes the crystallization water in pelletizing.
S300：The material obtained by step S200 is set to enter volatilization area
Embodiments in accordance with the present invention, make the material obtained by step S200 enter volatilization area, volatilization is not provided with burning in area
Mouth, but utilize heat smoke in resolver to flow the temperature control by area of volatilizing at 800~1000 degrees Celsius, in resolver
To lead oxide, zinc oxide and indium oxide be reduced into metallic lead, zinc, indium under carbonaceous reducing agent effect and enter and be arranged on and wave
Send out in the first flue in area, deposition is oxidized in the first flue, so that lead oxide, zinc oxide and indium oxide dust are reclaimed,
And then realize the synthetical recovery of valuable element lead, zinc and indium.Specifically, preheating zone, resolver and volatilization area between be not provided with every
Wall, and resolver and volatilization area share an exit flue, i.e. the first flue, and the obtained sulfur-containing smoke gas in resolver is through the
Carrying out reclaiming after one flue is used to prepare sulfuric acid.
S400：The material obtained by step S300 is set to enter reducing zone
Embodiments in accordance with the present invention, make the material obtained by step S300 enter reducing zone, by using the second heating
Unit provides heat for reducing zone so that the pelletizing containing iron oxide obtained in volatilization area carries out reduction treatment, so as to
So that the iron oxide in pelletizing is reduced to metallic iron in the presence of carbonaceous reducing agent, obtains metallized pellet and go back protocercal tail
Gas, wherein reduction configured the second flue in reducing zone of tail gas is come out of the stove.
According to the specific embodiment of the present invention, the second heating unit is arranged to be suitable to the temperature control of reducing zone
At 1200~1350 degrees Celsius, fully reduced by carbonaceous reducing agent so as to the iron oxide that ensures in the pelletizing containing iron oxide
For metallic iron.
According to another specific embodiment of the present invention, the particular type of the second heating unit is not particularly restricted, this
Art personnel can be selected according to actual needs, and according to the specific example of the present invention, the second heating unit can be
Non- heat-accumulating burner and heat-accumulating burner, and in reducing zone, in circumferential direction, along furnace bottom rotation direction, heat accumulating type burns
Mouth is arranged on the downstream of non-heat-accumulating burner, so that the reduction efficiency of iron oxide can be not only significantly improved, and can be abundant
Improve the utilization ratio of heat.
S500：Metallized pellet is reclaimed in discharge zone
Embodiments in accordance with the present invention, with the rotation of rotary hearth furnace, the metallized pellet that reducing zone is obtained goes out through discharge zone
Stove.
The method of processing lead and zinc smelting dreg according to embodiments of the present invention is divided into by using partition wall by space is smelted
Feed zone, preheating zone, resolver, volatilization area, reducing zone and discharge zone so that in lead and zinc smelting dreg element sulphur in resolver with sulphur
Compound form is recovered, and lead, zinc, phosphide element volatilization area flue in the form of lead oxide, zinc oxide and indium oxide
It is recovered, and ferro element therein is recycled in reducing zone with being present in the form of fe in metallized pellet, so that
Solve valuable element in lead-zinc smelting slag in the prior art and be unable to the problem of synthetical recovery, and then solve due to lead-zinc smelting
Slag can not utilize and cause the waste problem of valuable resource, at the same by using rotary hearth furnace can realize iron in lead and zinc smelting dreg,
The valuable elements such as lead, zinc, indium, sulphur are recovered in the same apparatus, so as to significantly reduce equipment investment cost, Jin Erti
The economic benefit of high enterprise.
With reference to Fig. 3, the method for processing lead and zinc smelting dreg according to embodiments of the present invention further comprises：
S600：Metal simple-substance iron is separated from metallized pellet by mill ore magnetic selection method
Embodiments in accordance with the present invention, metallized pellet carries out processing separation after being come out of the stove through discharge zone through mill ore magnetic selection system
Obtain metal simple-substance iron and tailings.It should be noted that those skilled in the art can be according to actual needs to mill ore magnetic selection
Actual conditions is selected.
It should be noted that the feature and advantage described by the above-mentioned rotary hearth furnace for processing lead and zinc smelting dreg are equally applicable
In the method for the processing lead and zinc smelting dreg, here is omitted.
Below with reference to specific embodiment, present invention is described, it is necessary to which explanation, these embodiments are only description
Property, without limiting the present invention in any way.
Embodiment
Sulfate lead and zinc smelting dreg, its composition is：TFe 26.27wt%, Pb 2.59wt%, Zn 10.36wt%, In
0.03wt%, S 7.26wt%.Lead and zinc smelting dreg is lead and zinc smelting dreg with other raw material proportionings：Reducing agent：Binding agent=100：
18：5, mixed raw material carries out agglomeration, and the pelletizing after drying enters to be handled in rotary hearth furnace, and pelletizing sequentially passes through charging
Area, preheating zone, resolver, volatilization area, reducing zone and discharge zone, in preheating zone, the crystallization water in pelletizing is first volatilized, in advance
Temperature is 600 DEG C in hot-zone, and is not separately provided burner, but is heated using the common burner radiant heat in resolver；
In resolver, sulphate decomposition sulphidisation (sulfur dioxide and sulfur trioxide) and metal oxide (lead oxide, oxygen in pelletizing
Change zinc, indium oxide and iron oxide etc.), the area sets common burner, and temperature is 1220 DEG C ± 20 DEG C；Material after decomposition, which enters, to be waved
Area is sent out, lead oxide, zinc oxide, indium oxide etc. is reduced into metallic lead, zinc, indium under carbonaceous reducing agent effect and is volatized into volatilization
Area's flue, is oxidized deposition in flue, and lead oxide, zinc oxide, indium oxide dust are reclaimed in flue；Pass through the height of resolver
Warm flue gas will volatilize area's temperature control at 950 DEG C ± 20 DEG C, and sulfur-containing smoke gas is reclaimed by flue send system for preparing sulfuric acid to reclaim sulphur；And
Pelletizing containing iron oxide carries out reduction reaction in subsequent reducing zone, and reducing zone front portion sets common burner, and rear portion is set
Heat-accumulating burner, 1250 DEG C ± 20 DEG C of temperature obtains metallized pellet from discharge zone, and pelletizing delivers to mill ore magnetic selection system and carries out slag
Iron is separated, and obtains metal iron powder.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (11)
1. a kind of rotary hearth furnace for handling lead and zinc smelting dreg, it is characterised in that including：
Rotatable stove bottom；
Smelting space is limited in annular furnace, the belt burner hearth, and along the circumference of the annular furnace, by material
The smelting space is divided into feed zone, preheating zone, resolver, volatilization area, reducing zone and discharge zone successively into region；
First partition wall, first partition wall is arranged between the feed zone and the preheating zone；
Second partition wall, second partition wall is arranged between the volatilization area and the reducing zone；
3rd partition wall, the 3rd partition wall is arranged between the reducing zone and the discharge zone；
First heating unit, first heating unit is arranged in the resolver；And
Second heating unit, second heating unit is arranged in the reducing zone.
2. rotary hearth furnace according to claim 1, it is characterised in that first heating unit is arranged to be suitable to by described in
The temperature control of resolver is at 800~1220 degrees Celsius, and second heating unit is arranged to be suitable to the reducing zone
Temperature control is at 1200~1350 degrees Celsius.
3. rotary hearth furnace according to claim 1 or 2, it is characterised in that first heating unit burns including non-heat accumulating type
Mouth.
4. rotary hearth furnace according to claim 1 or 2, it is characterised in that second heating unit burns including non-heat accumulating type
Mouth and heat-accumulating burner.
5. rotary hearth furnace according to claim 4, it is characterised in that in the reducing zone, in circumferential direction, along furnace bottom
Rotation direction, the heat-accumulating burner is arranged on the downstream of the non-heat-accumulating burner.
6. rotary hearth furnace according to claim 1, it is characterised in that further comprise：
First flue, first flue is arranged in the volatilization area；And
Second flue, second flue is arranged on the reducing zone.
7. the method that the rotary hearth furnace described in a kind of any one of utilization claim 1~6 handles lead and zinc smelting dreg, it is characterised in that
Including：
(1) pelletizing containing lead and zinc smelting dreg and reducing agent is made to enter the preheating zone via the feed zone, and described
Preheating zone carries out the pre-heat treatment, so that the crystallization water volatilization in the pelletizing, wherein, the lead and zinc smelting dreg contains sulfuric acid
Salt；
(2) material obtained by making in step (1) enters the resolver, and makes the sulphate decomposition in the resolver
For sulfide and metal oxide, the metal oxide includes lead oxide, zinc oxide, indium oxide and iron oxide；
(3) material obtained by making in step (2) enters the volatilization area, and makes lead oxide, zinc oxide in the volatilization area
Metallic lead, zinc and indium are reduced in the presence of the reducing agent with indium oxide, and reclaims the metallic lead, zinc and indium；
(4) material obtained by making in step (3) enters reducing zone, and the iron oxide is gone back described in the reducing zone
Fe is reduced in the presence of former agent, to obtain metallized pellet；And
(5) metallized pellet is reclaimed in the discharge zone.
8. method according to claim 7, it is characterised in that in step (3), reclaims described using first flue
Metallic lead, zinc and indium.
9. method according to claim 7, it is characterised in that the temperature of the preheating zone is 500~700 degrees Celsius, institute
The temperature for stating resolver is 800~1220 degrees Celsius, and the temperature in the volatilization area is 800~1000 degrees Celsius, the reducing zone
Temperature be 1200~1350 degrees Celsius.
10. method according to claim 7, it is characterised in that further comprise：
(6) elemental metals iron is separated from the metallized pellet by mill ore magnetic selection method.
11. method according to claim 7, it is characterised in that in step (3), further comprise by described first
Flue reclaims sulfur-containing smoke gas, and by the sulfur-containing smoke gas for preparing sulfuric acid.
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