CN106148682A - Process the method and system of zinc leaching residue - Google Patents
Process the method and system of zinc leaching residue Download PDFInfo
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- CN106148682A CN106148682A CN201610621847.0A CN201610621847A CN106148682A CN 106148682 A CN106148682 A CN 106148682A CN 201610621847 A CN201610621847 A CN 201610621847A CN 106148682 A CN106148682 A CN 106148682A
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- leaching residue
- zinc
- zinc leaching
- pelletizing
- coal
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses the method and system processing zinc leaching residue, the method includes: zinc leaching residue is carried out drying and processing by (1)；(2) zinc leaching residue siccative is crushed；(3) high volatile coal is carried out levigate process, obtain coal dust；(4) zinc leaching residue broken material is carried out mixed pelletizing with coal dust, calcium system flux and water；(5) by the feed zone of mixing pelletizing supply to rotary hearth furnace, make to mix pelletizing and sequentially pass through middle warm area and the high-temperature region of rotary hearth furnace, the therefrom warm area of the flue dust containing lead oxide, silver oxide, Indium sesquioxide. and zinc oxide obtained is discharged, the metallized pellet obtained is discharged from cooling zone, and cooling zone is provided with water-cooling wall；(6) metallized pellet is carried out separating treatment, obtain metallic iron and tailings.The method achieving the effective recycling of the valuable metals such as ferrum lead zinc-silver indium in zinc leaching residue, and the removal efficiency of lead zinc reaches more than 95%, the removal efficiency of silver indium reaches more than 80%, and the grade of gained metallic iron is more than 96%.
Description
Technical field
The invention belongs to metallurgical technology field, specifically, the present invention relates to a kind of method processing zinc leaching residue and be
System.
Background technology
Zinc smelting dreg has duality, on the one hand there is environment direct or potentially hazardous, on the other hand in metallurgical slag
There is again a large amount of valuable metal, therefore these waste residues will become important secondary resource.At present, domestic and international lead-zinc smelting slag for comprehensive
Utilizing technique mainly to have valuable metal recovery, produce the method such as cement and building materials, these methods are processing the mistake of lead and zinc smelting dreg
Although journey has reached the purpose of the comprehensive utilization of resource, but there is also certain drawback.
Shi Shixin yield big country of China, will discharge substantial amounts of zinc leaching residue every year.So far, domestic widespread practice
It is zinc leaching residue to be allocated into a certain amount of coal dust add in rotary kiln, under the temperature conditions of 1100-1300 DEG C, makes the zinc in slag
With the volatilization of the metal such as part silver, indium.But the method can produce substantial amounts of carbon containing kiln slag, these kiln slag values are little,
And owing to how environment can be had substantial amounts of ferrum and carbon in kiln slag containing some non-ferrous metals in kiln slag simultaneously
Efficiently utilize these resources, be a challenge of metallurgy industry.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the present invention
One purpose is to propose a kind of method and system processing zinc leaching residue, the method achieves the ferrum lead zinc-silver in zinc leaching residue
The effective recycling of the valuable metals such as indium, and the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%,
The grade of gained metallic iron is more than 96%.
In one aspect of the invention, the present invention proposes a kind of method processing zinc leaching residue.Reality according to the present invention
Executing example, the method includes:
(1) zinc leaching residue is carried out drying and processing, in order to obtain zinc leaching residue siccative；
(2) described zinc leaching residue siccative is crushed, in order to obtain zinc leaching residue broken material；
(3) high volatile coal is carried out levigate process, in order to obtain coal dust；
(4) described zinc leaching residue broken material is carried out mixed pelletizing with described coal dust, calcium system flux and water, in order to mixed
Close pelletizing；
(5) by the feed zone of described mixing pelletizing supply to rotary hearth furnace so that described mixing pelletizing sequentially passes through described turning
The middle warm area of end stove and high-temperature region, the flue dust containing lead oxide, silver oxide, Indium sesquioxide. and zinc oxide obtained is from described middle warm area
Discharging, the metallized pellet obtained is discharged from cooling zone, and described cooling zone is provided with water-cooling wall；
(6) described metallized pellet is carried out separating treatment, in order to obtain metallic iron and tailings.
Thus, the method processing zinc leaching residue according to embodiments of the present invention is by using high volatile coal and zinc leaching residue
Carry out mixed pelletizing with calcium system flux, and the supply of gained mixing pelletizing is carried out reduction treatment, in zinc leaching residue to rotary hearth furnace
The compound of lead, silver, indium and zinc be reduced to simple substance lead, silver, indium and zinc at the middle warm area of rotary hearth furnace, and the simple substance generated
Lead, silver, indium and zinc secondary oxidation in flue is recovered with the form of lead oxide, silver oxide, Indium sesquioxide. and zinc oxide, and zinc leaching
Iron containing compounds in slagging tap is reduced to fe, and the continuous agglomeration of ferrum granule in the high-temperature region of rotary hearth furnace, obtains
The separated process of metallized pellet i.e. can get metallic iron, simultaneously by use in dispensing high volatile coal as reducing agent,
The middle warm area of rotary hearth furnace, the volatile matter volatilization in coal causes pelletizing efflorescence, thus beneficially valuable metal element in zinc leaching residue
Removing, and the high-temperature region that the calcium system flux in dispensing is in rotary hearth furnace can promote the pelletizing adhesion of efflorescence, thus can
To promote the discharging of metallic iron agglomeration the beneficially gained metallized pellet generated.Thus, the present processes is used not
Address only zinc leaching residue bulk deposition and pollute the problem of environment, and the ferrum lead zinc-silver indium etc. achieved in zinc leaching residue has valency
The effective recycling of metal, and the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%, gained metal
The grade of ferrum is more than 96%.
It addition, the method for process zinc leaching residue according to the above embodiment of the present invention can also have following additional technology
Feature:
In some embodiments of the invention, in step (2), the particle diameter of described zinc leaching residue broken material is not higher than 75 μ
m.Thus, it is possible to significantly improve lead silver silver zinc and the organic efficiency of ferrum.
In some embodiments of the invention, it is characterised in that in step (3), the volatile matter of described high volatile coal
Being not less than 40wt%, optional, described high volatile coal is at least one in brown coal and jet coal, optional, in step
Suddenly, in (3), the particle diameter of described coal dust is not higher than 1mm.Thus, it is possible to improve lead silver silver zinc and the organic efficiency of ferrum further.
In some embodiments of the invention, in step (4), by described zinc leaching residue broken material and described coal dust, institute
State calcium system flux and described water 100:(42 in mass ratio～60): (5～10): (8-12) mixes.Thus, it is possible to further
Improve lead silver silver zinc and the organic efficiency of ferrum.
In some embodiments of the invention, described calcium system flux is selected from CaCO3With at least one in CaO.Thus,
The discharging of metallic iron agglomeration that high-temperature region generates beneficially gained metallized pellet can be promoted.
In some embodiments of the invention, in step (5), the temperature of described middle warm area is 1180～1230 Celsius
Degree, optional, in step (5), the temperature of described high-temperature region is 1230～1280 degrees Celsius.Thus, it is possible to improve further
Lead silver silver zinc and the organic efficiency of ferrum.
In some embodiments of the invention, in step (5), it is Celsius that the temperature of described metallized pellet is not higher than 900
Degree.Thus, it is possible to raising pellet strength, thus the discharging of beneficially metallized pellet, it is avoided that ball during discharging simultaneously
The oxidation of group.
In some embodiments of the invention, in step (6), described separating treatment is mill ore magnetic selection or high temperature melting divides.
In another aspect of the invention, the present invention proposes a kind of system processing zinc leaching residue.According to the present invention's
Embodiment, this system includes:
Drying unit, described drying unit has zinc leaching residue entrance and zinc leaching residue drier outlet；
Breaker, described breaker has zinc leaching residue siccative entrance and the outlet of zinc leaching residue broken material, described zinc
Leached mud siccative entrance is connected with described zinc leaching residue drier outlet；
Fine mill, described fine mill has high volatile coal entrance and discharge；
Mixed pelletizing device, described mixed pelletizing device has zinc leaching residue broken material entrance, coal powder entrance, calcium system flux
Entrance, water inlet and the outlet of mixing pelletizing, described zinc leaching residue broken material entrance is connected with the outlet of described zinc leaching residue broken material,
Described coal powder entrance is connected with described discharge；
Rotary hearth furnace, described rotary hearth furnace is divided into feed zone, middle warm area, high-temperature region and cooling along rotary hearth furnace rotation direction
District, described feed zone is provided with mixing pelletizing entrance, and the outlet of described mixing pelletizing entrance and described mixing pelletizing is connected, described in
Warm area is provided with flue dust outlet, and described cooling zone is provided with water-cooling wall and metallized pellet outlet；
Segregation apparatus, described segregation apparatus has metallized pellet entrance, metallic iron outlet and tailings outlet, described metal
Pellet entrance is connected with the outlet of described metallized pellet.
Thus, the system processing zinc leaching residue according to embodiments of the present invention is by using high volatile coal and zinc leaching residue
Carry out mixed pelletizing with calcium system flux, and use rotary hearth furnace that gained mixing pelletizing is carried out reduction treatment, lead in zinc leaching residue,
Silver, the compound of indium and zinc are reduced to simple substance lead, silver, indium and zinc at the middle warm area of rotary hearth furnace, and the simple substance lead generated, silver,
Indium and zinc secondary oxidation in flue is recovered with the form of lead oxide, silver oxide, Indium sesquioxide. and zinc oxide, and in zinc leaching residue
Iron containing compounds be reduced to fe, and the continuous agglomeration of ferrum granule in the high-temperature region of rotary hearth furnace, metallized
The separated process of pelletizing i.e. can get metallic iron, simultaneously by dispensing, employing high volatile coal is as reducing agent, at rotary hearth furnace
Middle warm area, the volatile matter volatilization in coal causes pelletizing efflorescence, thus the beneficially removing of valuable metal element in zinc leaching residue,
And the high-temperature region that the calcium system flux in dispensing is in rotary hearth furnace can promote the pelletizing adhesion of efflorescence, such that it is able to promote raw
The metallic iron agglomeration become the discharging of beneficially gained metallized pellet.Thus, the system of the application is used to not only solve
Zinc leaching residue bulk deposition pollutes the problem of environment, and achieves having of the valuable metals such as the ferrum lead zinc-silver indium in zinc leaching residue
Effect recycles, and the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%, the grade of gained metallic iron
More than 96%.
In some embodiments of the invention, described segregation apparatus is mill ore magnetic selection device or high temperature melting separating device.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment and will become
Substantially with easy to understand, wherein:
Fig. 1 is the method flow schematic diagram processing zinc leaching residue according to an embodiment of the invention；
Fig. 2 is the system structure schematic diagram processing zinc leaching residue according to an embodiment of the invention；
Fig. 3 is the structural representation according to the rotary hearth furnace in the system processing zinc leaching residue of further embodiment of the present invention
Figure.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In one aspect of the invention, the present invention proposes a kind of method processing zinc leaching residue.Below with reference to Fig. 1 to this
The method processing zinc leaching residue of inventive embodiments is described in detail.According to embodiments of the invention, the method includes:
S100: zinc leaching residue is carried out drying and processing
In this step, zinc leaching residue is carried out drying and processing, obtain zinc leaching residue siccative.Concrete, zinc leaching residue is for adopting
The leached mud obtained by conventional wet lay zinc metallurgy flow process, and in this step, in gained zinc leaching residue siccative, water content is not higher than
6wt%.Thus, it is possible to significantly improve the organic efficiency of sequential reduction stage lead silver zinc indium ferrum.According to the present invention one is concrete
Embodiment, contains in zinc leaching residue: Fe 20～25wt%, Zn 10～17wt%, Pb 2～6wt%, Ag 50～300g/t,
In 100～300g/t, has higher economic benefit.
S200: zinc leaching residue siccative is crushed
In this step, zinc leaching residue siccative obtained above is crushed, obtains zinc leaching residue broken material.Thus, may be used
To significantly improve the contact area of follow-up zinc leaching residue and reducing agent, thus improve sequential reduction stage lead silver zinc indium ferrum further
Organic efficiency.
According to one embodiment of present invention, the particle diameter of zinc leaching residue broken material is not particularly restricted, art technology
Personnel can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of zinc leaching residue broken material
75 μm can be not higher than.Inventor finds, the zinc leaching residue broken material under this particle diameter can be fully contacted with reducing agent, thus enter
One step improves the organic efficiency of sequential reduction stage lead silver zinc indium ferrum.
S300: high volatile coal is carried out levigate process
In this step, high volatile coal is carried out levigate process, obtains coal dust.Thus, it is possible to significantly improve sequential reduction
During the contact area of coal dust and zinc leaching residue, thus improve the recovery effect of sequential reduction stage lead silver zinc indium ferrum further
Rate.
According to one embodiment of present invention, the volatile matter of high volatile coal is not particularly restricted, people in the art
Member can select according to actual needs, and according to a specific embodiment of the present invention, the volatile matter of high volatile coal is permissible
It is not less than 40wt%.Inventor finds, uses the pelletizing powder that this volatile component coal can remarkably promote in follow-up rotary hearth furnace in warm area
Change, thus contribute to the removing of lead zinc indium phosphide element.
According to still a further embodiment, the particular type of high volatile coal is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to a particular embodiment of the invention, high volatile coal can be selected from brown
At least one in coal and jet coal.Inventor finds, uses such high volatile coal to be significantly better than other and promotes zinc leaching residue
The removing of middle lead zinc indium phosphide element.
According to still another embodiment of the invention, the particle diameter of gained coal dust is not particularly restricted, those skilled in the art
Can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of coal dust can be not higher than
1mm.Thus, it is possible to significantly improve the contact area of itself and zinc leaching residue, thus improve returning of ferrum lead zinc indium phosphide element further
Produce effects rate.
S400: zinc leaching residue broken material is carried out mixed pelletizing with coal dust, calcium system flux and water
In this step, the zinc leaching residue broken material obtained by above-mentioned is carried out mixed pelletizing with coal dust, calcium system flux and water,
Obtain mixing pelletizing.Inventor finds, by using high volatile coal powder in dispensing, at the middle warm area of rotary hearth furnace, in coal dust
Volatile matter volatilization causes pelletizing efflorescence, thus the beneficially removing of valuable metal element in zinc leaching residue, and the calcium in dispensing
It is the pelletizing adhesion that can promote efflorescence of flux high-temperature region in rotary hearth furnace, such that it is able to promote the metallic iron generated to assemble
Grow up and the discharging of beneficially gained metallized pellet.
According to one embodiment of present invention, the mixed proportion of zinc leaching residue broken material and coal dust, calcium system flux and water is also
Being not particularly limited, those skilled in the art can select according to actual needs, is embodied as according to one of the present invention
Example, zinc leaching residue broken material and coal dust, calcium system flux and water can 100:(42 in mass ratio～60): (5～10): (8～12)
Mix.Inventor finds, the coal dust amount of allocating into very little can not the abundant metal-oxide in reducting pellet, thus cause lead zinc
The response rate of silver indium ferrum reduces, and the coal dust amount of allocating into too many pelletizing powder phenomenon-tion is serious, thus is unfavorable for the middle temperature at rotary hearth furnace
Reduction discharging in district, and cause gained metallized pellet degree of metalization to reduce, and the calcium system flux amount of allocating into is very little, does not has viscous
The even effect of efflorescence pelletizing, thus it is unfavorable for discharging, and the amount of allocating into can form substantial amounts of fayalite too much, affects the reduction of ferrum
Reclaim.
According to still a further embodiment, the particular type of calcium system flux is not particularly restricted, art technology
Personnel can select according to actual needs, and according to a specific embodiment of the present invention, calcium system flux can be to be selected from
CaCO3With at least one in CaO.Inventor finds, such calcium system flux can be significantly better than other and promote follow-up rotary hearth furnace
Efflorescence pelletizing adhesion in high-temperature region, such that it is able to promote the metallic iron agglomeration that generates beneficially gained metallized pellet
Discharging.
S500: by the feed zone of mixing pelletizing supply to rotary hearth furnace so that mixing pelletizing sequentially passes through the middle temperature of rotary hearth furnace
District and high-temperature region
In this step, by mixing pelletizing obtained above, (the lead zinc-silver indium in mixing pelletizing is respectively with sulfide, oxidation
Presented in thing, sulfate) supply the feed zone to rotary hearth furnace, feed zone is under the heat radiation effect of middle warm area and high-temperature region
Can preheat mixing pelletizing, along with the rotation of furnace bottom, mixing pelletizing enters into middle warm area, during being somebody's turn to do, in coal dust
Volatile matter volatilization causes pelletizing efflorescence, and the zinc sulfate in pelletizing is decomposed into zinc oxide and sulfur dioxide, and zinc oxide is by coal reduction
Entering flue system in vapour form for metallic zinc by secondary oxidation is zinc oxide, and in like manner lead silver indium occurs corresponding chemical reaction
Flue is recovered with sulfide, oxide and muriatic form together with zinc, obtains containing lead oxide, silver oxide, oxygen
Changing indium and the flue dust of zinc oxide, after testing, the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%, then
The pelletizing of efflorescence enters high-temperature region, and the calcium system flux in pelletizing aoxidizes two with the silicon dioxide in pelletizing and three under high temperature action
Aluminum etc. form the thing phase of low melting point, promote the pelletizing of efflorescence to be bonded together, and the iron compound in pelletizing is carried out deeply simultaneously
Degree reduction obtains metallic iron, the continuous agglomeration of iron granule, obtains metallized pellet and enters cooling zone water cooled wall cooling
Rear discharge rotary hearth furnace, the degree of metalization of gained metallized pellet reaches more than 82% after testing.
According to one embodiment of present invention, the temperature of middle warm area can be 1180～1230 degrees Celsius, the temperature of high-temperature region
Degree can be 1230～1280 degrees Celsius.Inventor finds, uses this temperature can be significantly better than other and improves ferrum lead zinc-silver indium
Reduction efficiency, thus improve the response rate of ferrum lead zinc-silver indium.
According to still a further embodiment, after the cooling of water cooled wall, the temperature of metallized pellet can be not higher than 900
Degree Celsius.Inventor finds, the metallized pellet obtained high-temperature region by arranging water-cooling wall in rotary hearth furnace cooling zone carries out cold
But, pellet strength can be significantly improved, thus the discharging of beneficially metallized pellet, it is avoided that pelletizing during discharging simultaneously
Oxidation, and then improve metallic iron the response rate.
S600: metallized pellet is carried out separating treatment
In this step, the metallized pellet obtained above-mentioned cooling zone carries out separating treatment, obtains metallic iron and tailings, warp
The grade of the metallic iron obtained by detection reaches more than 96%.Concrete, can be to metal in the way of using molten point or mill ore magnetic selection
Pellet carries out separating treatment.
The method processing zinc leaching residue according to embodiments of the present invention is by using high volatile coal and zinc leaching residue and calcium
It is that flux carries out mixed pelletizing, and the supply of gained mixing pelletizing is carried out reduction treatment to rotary hearth furnace, lead in zinc leaching residue,
Silver, the compound of indium and zinc are reduced to simple substance lead, silver, indium and zinc at the middle warm area of rotary hearth furnace, and the simple substance lead generated, silver,
Indium and zinc secondary oxidation in flue is recovered with the form of lead oxide, silver oxide, Indium sesquioxide. and zinc oxide, and in zinc leaching residue
Iron containing compounds be reduced to fe, and the continuous agglomeration of ferrum granule in the high-temperature region of rotary hearth furnace, metallized
The separated process of pelletizing i.e. can get metallic iron, simultaneously by dispensing, employing high volatile coal is as reducing agent, at rotary hearth furnace
Middle warm area, the volatile matter volatilization in coal causes pelletizing efflorescence, thus the beneficially removing of valuable metal element in zinc leaching residue,
And the high-temperature region that the calcium system flux in dispensing is in rotary hearth furnace can promote the pelletizing adhesion of efflorescence, such that it is able to promote raw
The metallic iron agglomeration become the discharging of beneficially gained metallized pellet.Thus, the present processes is used to not only solve
Zinc leaching residue bulk deposition pollutes the problem of environment, and achieves having of the valuable metals such as the ferrum lead zinc-silver indium in zinc leaching residue
Effect recycles, and the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%, the grade of gained metallic iron
More than 96%.
In another aspect of the invention, what the present invention proposed a kind of method implementing above-mentioned process zinc leaching residue is
System.According to embodiments of the invention, with reference to Fig. 2 and 3, this system includes: drying unit 100, breaker 200, fine mill
300, mixed pelletizing device 400, rotary hearth furnace 500 and segregation apparatus 600.
According to embodiments of the invention, drying unit 100 has zinc leaching residue entrance 101 and zinc leaching residue drier outlet
102, and be suitable to zinc leaching residue is carried out drying and processing, obtain zinc leaching residue siccative.Concrete, zinc leaching residue is conventional wet for using
The leached mud that method zinc metallurgy flow process obtains, and in this step, in gained zinc leaching residue siccative, water content is not higher than 6wt%.Thus,
The organic efficiency of sequential reduction stage lead silver zinc indium ferrum can be significantly improved.A specific embodiment according to the present invention, zinc soaks
Contain in slagging tap: Fe 20～25wt%, Zn 10～17wt%, Pb 2～6wt%, Ag 50～300g/t, In 100～
300g/t, has higher economic benefit.
According to embodiments of the invention, breaker 200 has zinc leaching residue siccative entrance 201 and zinc leaching residue broken material
Outlet 202, zinc leaching residue siccative entrance 201 is connected with zinc leaching residue drier outlet 102, and is suitable to leach zinc obtained above
Slag siccative crushes, and obtains zinc leaching residue broken material.Thus, it is possible to significantly improve contacting of follow-up zinc leaching residue and reducing agent
Area, thus improve the organic efficiency of sequential reduction stage lead silver zinc indium ferrum further.
According to one embodiment of present invention, the particle diameter of zinc leaching residue broken material is not particularly restricted, art technology
Personnel can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of zinc leaching residue broken material
75 μm can be not higher than.Inventor finds, the zinc leaching residue broken material under this particle diameter can be fully contacted with reducing agent, thus enter
One step improves the organic efficiency of sequential reduction stage lead silver zinc indium ferrum.
According to embodiments of the invention, fine mill 300 has high volatile coal entrance 301 and discharge 302, and suitable
In high volatile coal is carried out levigate process, obtain coal dust.Thus, it is possible to coal dust soaks with zinc during significantly improving sequential reduction
The contact area slagged tap, thus improve the organic efficiency of sequential reduction stage lead silver zinc indium ferrum further.
According to one embodiment of present invention, the volatile matter of high volatile coal is not particularly restricted, people in the art
Member can select according to actual needs, and according to a specific embodiment of the present invention, the volatile matter of high volatile coal is permissible
It is not less than 40wt%.Inventor finds, uses the pelletizing powder that this volatile component coal can remarkably promote in follow-up rotary hearth furnace in warm area
Change, thus contribute to the removing of lead zinc indium phosphide element.
According to still a further embodiment, the particular type of high volatile coal is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to a particular embodiment of the invention, high volatile coal can be selected from brown
At least one in coal and jet coal.Inventor finds, uses such high volatile coal to be significantly better than other and promotes zinc leaching residue
The removing of middle lead zinc indium phosphide element.
According to still another embodiment of the invention, the particle diameter of gained coal dust is not particularly restricted, those skilled in the art
Can select according to actual needs, according to a specific embodiment of the present invention, the particle diameter of coal dust can be not higher than
1mm.Thus, it is possible to significantly improve the contact area of itself and zinc leaching residue, thus improve returning of ferrum lead zinc indium phosphide element further
Produce effects rate.
According to embodiments of the invention, mixed pelletizing device 400 has zinc leaching residue broken material entrance 401, coal powder entrance
402, calcium system flux entrance 403, water inlet 404 and mixing pelletizing outlet 405, zinc leaching residue broken material entrance 401 leaches with zinc
Slag broken material outlet 102 is connected, and coal powder entrance 402 is connected with discharge 302, and is suitable to above-mentioned obtained zinc leaching residue
Broken material carries out mixed pelletizing with coal dust, calcium system flux and water, obtains mixing pelletizing.Inventor finds, by adopting in dispensing
Using high volatile coal powder, at the middle warm area of rotary hearth furnace, the volatile matter volatilization in coal dust causes pelletizing efflorescence, thus beneficially zinc leaches
The removing of valuable metal element in slag, and the high-temperature region that the calcium system flux in dispensing is in rotary hearth furnace can promote efflorescence
Pelletizing adhesion, such that it is able to promote the discharging of metallic iron agglomeration the beneficially gained metallized pellet generated.
According to one embodiment of present invention, the mixed proportion of zinc leaching residue broken material and coal dust, calcium system flux and water is also
Being not particularly limited, those skilled in the art can select according to actual needs, is embodied as according to one of the present invention
Example, zinc leaching residue broken material and coal dust, calcium system flux and water can 100:(42 in mass ratio～60): (5～10): (8-12) enters
Row mixing.Inventor finds, the coal dust amount of allocating into very little can not the abundant metal-oxide in reducting pellet, thus cause lead zinc-silver
The response rate of indium ferrum reduces, and the coal dust amount of allocating into too many pelletizing powder phenomenon-tion is serious, thus is unfavorable for the middle warm area at rotary hearth furnace
Middle reduction discharging, and cause gained metallized pellet degree of metalization to reduce, and the calcium system flux amount of allocating into is very little, does not has adhesion
The effect of efflorescence pelletizing, thus it is unfavorable for discharging, and the amount of allocating into can form substantial amounts of fayalite too much, affects reverting back of ferrum
Receive.
According to still a further embodiment, the particular type of calcium system flux is not particularly restricted, art technology
Personnel can select according to actual needs, and according to a specific embodiment of the present invention, calcium system flux can be to be selected from
CaCO3With at least one in CaO.Inventor finds, such calcium system flux can be significantly better than other and promote follow-up rotary hearth furnace
Efflorescence pelletizing adhesion in high-temperature region, such that it is able to promote the metallic iron agglomeration that generates beneficially gained metallized pellet
Discharging.
According to embodiments of the invention, with reference to Fig. 2 and 3, rotary hearth furnace 500 is divided into feed zone along furnace bottom rotation direction
51, middle warm area 52, high-temperature region 53 and cooling zone 54, feed zone 51 is provided with mixing pelletizing entrance 501, mixes pelletizing entrance 501
Being connected with mixing pelletizing outlet 405, middle warm area 52 is provided with flue dust outlet 502, and cooling zone 54 is provided with water-cooling wall 55 and metal
Pellet outlet 503, and be suitable to the feed zone of mixing pelletizing obtained above supply to rotary hearth furnace so that mixing pelletizing is successively
Through middle warm area and the high-temperature region of rotary hearth furnace, the flue dust containing lead oxide, silver oxide, Indium sesquioxide. and zinc oxide obtained is from described
Middle warm area is discharged, and the metallized pellet obtained is discharged from cooling zone.
Concrete, by mixing pelletizing obtained above (the lead zinc-silver indium in mixing pelletizing respectively with sulfide, oxide,
Presented in sulfate) supply the feed zone to rotary hearth furnace, feed zone can under the heat radiation effect of middle warm area and high-temperature region
To preheat mixing pelletizing, along with the rotation of furnace bottom, mixing pelletizing enters into middle warm area, during being somebody's turn to do, and waving in coal dust
Sending out a point volatilization and cause pelletizing efflorescence, the zinc sulfate in pelletizing is decomposed into zinc oxide and sulfur dioxide, and zinc oxide by coal reduction is
It is zinc oxide that metallic zinc enters flue system in vapour form by secondary oxidation, and in like manner lead silver indium occurs corresponding chemical reaction to exist
Flue is recovered with sulfide, oxide and muriatic form together with zinc, obtains containing lead oxide, silver oxide, oxidation
Indium and the flue dust of zinc oxide, after testing, the removal efficiency of lead zinc reaches more than 95%, and the removal efficiency of silver indium reaches more than 80%, then powder
Change pelletizing enter high-temperature region, the calcium system flux in pelletizing under high temperature action with the silicon dioxide in pelletizing and aluminium sesquioxide
Deng the thing phase of formation low melting point, promoting the pelletizing of efflorescence to be bonded together, the iron compound in pelletizing carries out the degree of depth simultaneously
Reduction obtains metallic iron, the continuous agglomeration of iron granule, after obtaining the water cooled wall cooling of metallized pellet entrance cooling zone
Discharging rotary hearth furnace, the degree of metalization of gained metallized pellet reaches more than 82% after testing.
According to one embodiment of present invention, the temperature of middle warm area can be 1180～1230 degrees Celsius, the temperature of high-temperature region
Degree can be 1230～1280 degrees Celsius.Inventor finds, uses this temperature can be significantly better than other and improves ferrum lead zinc-silver indium
Reduction efficiency, thus improve the response rate of ferrum lead zinc-silver indium.
According to still a further embodiment, after the cooling of water cooled wall, the temperature of metallized pellet can be not higher than 900
Degree Celsius.Inventor finds, the metallized pellet obtained high-temperature region by arranging water-cooling wall in rotary hearth furnace cooling zone carries out cold
But, pellet strength can be significantly improved, thus the discharging of beneficially metallized pellet, it is avoided that pelletizing during discharging simultaneously
Oxidation, and then improve metallic iron the response rate.
According to embodiments of the invention, segregation apparatus 600 has metallized pellet entrance 601, metallic iron outlet 602 and tail
Slag outlet 603, metallized pellet entrance 601 is connected with metallized pellet outlet 503, and is suitable to the gold obtained above-mentioned cooling zone
Belonging to pellet and carry out separating treatment, obtain metallic iron and tailings, the grade of metallic iron obtained after testing reaches more than 96%.Root
According to a specific embodiment of the present invention, segregation apparatus 600 can be molten separating device or mill ore magnetic selection device.
The system processing zinc leaching residue according to embodiments of the present invention is by using high volatile coal and zinc leaching residue and calcium
Be that flux carries out mixed pelletizing, and use rotary hearth furnace that gained mixing pelletizing is carried out reduction treatment, lead in zinc leaching residue, silver,
The compound of indium and zinc is reduced to simple substance lead, silver, indium and zinc at the middle warm area of rotary hearth furnace, and the simple substance lead generated, silver, indium and
Zinc secondary oxidation in flue is recovered with the form of lead oxide, silver oxide, Indium sesquioxide. and zinc oxide, and containing in zinc leaching residue
Iron compound is reduced to fe, and the continuous agglomeration of ferrum granule in the high-temperature region of rotary hearth furnace, obtains metallized pellet
Separated process i.e. can get metallic iron, simultaneously by dispensing, employing high volatile coal is as reducing agent, in rotary hearth furnace
Warm area, the volatile matter volatilization in coal causes pelletizing efflorescence, thus the beneficially removing of valuable metal element in zinc leaching residue, and
The calcium system flux in dispensing high-temperature region in rotary hearth furnace can promote the pelletizing adhesion of efflorescence, such that it is able to promote generation
The discharging of metallic iron agglomeration beneficially gained metallized pellet.Thus, the system of the application is used to not only solve zinc leaching
Bulk deposition of slagging tap pollutes the problem of environment, and achieves effectively returning of the valuable metals such as the ferrum lead zinc-silver indium in zinc leaching residue
Receiving and utilize, and the removal efficiency of lead zinc reaches more than 95%, the removal efficiency of silver indium reaches more than 80%, and the grade of gained metallic iron is more than
96%.
Below with reference to specific embodiment, present invention is described, it should be noted that these embodiments are only to describe
Property, and limit the present invention never in any form.
Embodiment 1
Fe 20wt% in zinc leaching residue, Zn 14wt%, Pb 3wt%, Ag 180g/t, In 200g/t, soaks above-mentioned zinc
Slag tap and carry out drying and processing, obtain water content and be not higher than the zinc leaching residue drying material of 6wt%, then this zinc leaching residue is dried material
It is crushed to particle diameter and is not higher than 75 microns, be 100 by obtained zinc leaching residue broken material and brown coal, calcium carbonate according to mass ratio:
The proportioning of 42:6 at batch mixer mix homogeneously, adds the moisture of 12 weight portions with to roller ball press pressure ball, the wherein volatilization of brown coal
Being divided into 45%, the granularity of brown coal is not higher than 1mm, the long 40-45mm of mixing pelletizing, wide 30-35mm, the thickness 10mm-15mm obtained,
In ellipticity, then the mixing pelletizing obtained is dried under conditions of 200 DEG C in dehydrator, added by rotary hearth furnace distribution device
Entering and preheat to rotary hearth furnace feed zone, along with the rotation of furnace bottom, pelletizing is removed to enter into middle warm area by charging, and middle warm area temperature sets
Be set to 1200 ± 10 DEG C, lead in middle warm area pelletizing, zinc, silver, indium with the form of sulfide, oxide or simple substance volatilize into
Entering flue, collected by dust arrester installation, can obtain the oxide powder and zinc of zinc grade 64%, now pelletizing is due to volatile matter in brown coal
Decompose, volatilization and in pulverized state, pelletizing by middle warm area enter high-temperature region, high-temperature region temperature is set to 1220 ± 10 DEG C, at this
District can realize the deep reduction of ferrum, and the reduction eventually passing through high-temperature region can obtain ferrous metal rate 84%, lead removal efficiency
97.23%, zinc removal efficiency 98.69%, the removal efficiency 84.58% of silver, the metallized pellet of the removal efficiency 83.76% of indium, these
Pelletizing can obtain, through mill ore magnetic selection or molten point, the metallic iron that isolated grade is 96.5%.
Embodiment 2
Fe 20wt% in zinc leaching residue, Zn 14wt%, Pb 3wt%, Ag 180g/t, In 200g/t, soaks above-mentioned zinc
Slag tap and carry out drying and processing, obtain water content and be not higher than the zinc leaching residue drying material of 6wt%, then this zinc leaching residue is dried material
It is crushed to particle diameter and is not higher than 75 microns, be 100 by obtained zinc leaching residue broken material and brown coal, calcium carbonate according to mass ratio:
The proportioning of 42:6 at batch mixer mix homogeneously, adds the moisture of 12 weight portions with to roller ball press pressure ball, the wherein volatilization of brown coal
Being divided into 40%, the granularity of brown coal is not higher than 1mm, the long 40-45mm of mixing pelletizing, wide 30-35mm, the thickness 10mm-15mm obtained,
In ellipticity, then the mixing pelletizing obtained is dried under conditions of 200 DEG C in dehydrator, added by rotary hearth furnace distribution device
Entering and preheat to rotary hearth furnace feed zone, along with the rotation of furnace bottom, pelletizing is removed to enter into middle warm area by charging, and middle warm area temperature sets
Be set to 1200 ± 10 DEG C, lead in middle warm area pelletizing, zinc, silver, indium with the form of sulfide, oxide or simple substance volatilize into
Entering flue, collected by dust arrester installation, can obtain the oxide powder and zinc of zinc grade 63%, now pelletizing is due to volatile matter in brown coal
Decompose, volatilization and in pulverized state, pelletizing by middle warm area enter high-temperature region, high-temperature region temperature is set to 1270 ± 10 DEG C, at this
District can realize the deep reduction of ferrum, and the reduction eventually passing through high-temperature region can obtain ferrous metal rate more than 82%, lead removal efficiency
95.24%, zinc removal efficiency 95.88%, the removal efficiency 82.37% of silver, the metallized pellet of the removal efficiency 81.24% of indium, these
Pelletizing can obtain, through mill ore magnetic selection or molten point, the metallic iron that isolated grade is 97%.
Embodiment 3
Fe 24wt% in zinc leaching residue, Zn 17wt%, Pb 5wt%, Ag 260g/t, In 280g/t, soaks above-mentioned zinc
Slag tap and carry out drying and processing, obtain water content and be not higher than the zinc leaching residue drying material of 6wt%, then this zinc leaching residue is dried material
It is crushed to particle diameter and is not higher than 75 microns, by obtained zinc leaching residue broken material with jet coal, calcium carbonate according to mass ratio be
The proportioning of 100:55:8, at batch mixer mix homogeneously, adds the moisture of 12 weight portions with to roller ball press pressure ball, wherein jet coal
Volatilization be divided into 52%, the granularity of jet coal is not higher than 1mm, the long 40-45mm of mixing pelletizing obtained, wide 30-35mm, thickness
10mm-15mm, in ellipticity, then dries the mixing pelletizing obtained under conditions of 200 DEG C in dehydrator, passes through rotary hearth furnace
Distribution device joins rotary hearth furnace feed zone and preheats, and along with the rotation of furnace bottom, pelletizing is gone to enter into middle warm area by charging, in
Warm area temperature is set to 1210 ± 10 DEG C, and lead in middle warm area pelletizing, zinc, silver, indium are with sulfide, oxide or simple substance
Form is volatized into flue, is collected by dust arrester installation, can obtain the oxide powder and zinc of zinc grade 65%, and now pelletizing is due to brown coal
The decomposition of middle volatile matter, volatilization and in pulverized state, pelletizing is entered high-temperature region by middle warm area, high-temperature region temperature is set to 1270 ±
10 DEG C, can realize the deep reduction of ferrum in this district, the reduction eventually passing through high-temperature region can obtain ferrous metal rate 84%, and lead takes off
Except rate 98.49%, zinc removal efficiency 99.67%, the removal efficiency 85.27% of silver, the metallized pellet of the removal efficiency 85.19% of indium,
These pelletizings can obtain, through mill ore magnetic selection or molten point, the metallic iron that isolated grade is 97%.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
One or more embodiments or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (10)
1. the method processing zinc leaching residue, it is characterised in that including:
(1) zinc leaching residue is carried out drying and processing, in order to obtain zinc leaching residue siccative；
(2) described zinc leaching residue siccative is crushed, in order to obtain zinc leaching residue broken material；
(3) high volatile coal is carried out levigate process, in order to obtain coal dust；
(4) described zinc leaching residue broken material is carried out mixed pelletizing with described coal dust, calcium system flux and water, in order to obtain mixing ball
Group；
(5) by the feed zone of described mixing pelletizing supply to rotary hearth furnace so that described mixing pelletizing sequentially passes through described rotary hearth furnace
Middle warm area and high-temperature region, the flue dust containing lead oxide, silver oxide, Indium sesquioxide. and zinc oxide obtained is arranged from described middle warm area
Going out, the metallized pellet obtained is discharged from cooling zone, and described cooling zone is provided with water-cooling wall；
(6) described metallized pellet is carried out separating treatment, in order to obtain metallic iron and tailings.
Method the most according to claim 1, it is characterised in that in step (2), the particle diameter of described zinc leaching residue broken material
Not higher than 75 μm.
Method the most according to claim 1 and 2, it is characterised in that in step (3), the volatilization of described high volatile coal
Divide and be not less than 40wt%,
Optional, described high volatile coal is at least one in brown coal and jet coal,
Optional, in step (3), the particle diameter of described coal dust is not higher than 1mm.
Method the most according to claim 1, it is characterised in that in step (4), by described zinc leaching residue broken material and institute
State coal dust, described calcium system flux and described water 100:(42 in mass ratio～60): (5～10): (8～12) mix.
Method the most according to claim 4, it is characterised in that described calcium system flux is selected from CaCO3With in CaO at least
A kind of.
Method the most according to claim 1, it is characterised in that in step (5), the temperature of described middle warm area be 1180～
1230 degrees Celsius,
Optional, in step (5), the temperature of described high-temperature region is 1230～1280 degrees Celsius.
Method the most according to claim 1, it is characterised in that in step (5), the temperature of described metallized pellet is the highest
In 900 degrees Celsius.
Method the most according to claim 1, it is characterised in that in step (6), described separating treatment be mill ore magnetic selection or
High temperature melting divides.
9. the system of the method processing zinc leaching residue implemented described in any one of claim 1-8, it is characterised in that bag
Include:
Drying unit, described drying unit has zinc leaching residue entrance and zinc leaching residue drier outlet；
Breaker, described breaker has zinc leaching residue siccative entrance and the outlet of zinc leaching residue broken material, and described zinc leaches
Slag siccative entrance is connected with described zinc leaching residue drier outlet；
Fine mill, described fine mill has high volatile coal entrance and discharge；
Mixed pelletizing device, described mixed pelletizing device has zinc leaching residue broken material entrance, coal powder entrance, calcium system flux enter
Mouth, water inlet and the outlet of mixing pelletizing, described zinc leaching residue broken material entrance is connected with the outlet of described zinc leaching residue broken material, institute
State coal powder entrance to be connected with described discharge；
Rotary hearth furnace, described rotary hearth furnace is divided into feed zone, middle warm area, high-temperature region and cooling zone along rotary hearth furnace rotation direction,
Described feed zone is provided with mixing pelletizing entrance, and described mixing pelletizing entrance is connected with the outlet of described mixing pelletizing, described middle temperature
District is provided with flue dust outlet, and described cooling zone is provided with water-cooling wall and metallized pellet outlet；
Segregation apparatus, described segregation apparatus has metallized pellet entrance, metallic iron outlet and tailings outlet, described metallization ball
Group's entrance is connected with the outlet of described metallized pellet.
System the most according to claim 9, it is characterised in that described segregation apparatus is mill ore magnetic selection device or high temperature melting
Separating device.
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