CN107151741A - A kind of system and method for handling lead and zinc smelting dreg - Google Patents
A kind of system and method for handling lead and zinc smelting dreg Download PDFInfo
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- CN107151741A CN107151741A CN201710419618.5A CN201710419618A CN107151741A CN 107151741 A CN107151741 A CN 107151741A CN 201710419618 A CN201710419618 A CN 201710419618A CN 107151741 A CN107151741 A CN 107151741A
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- 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
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry processes
- C22B13/025—Recovery from waste materials
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/04—Obtaining zinc by distilling
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
Abstract
The present invention relates to the system and method for processing lead and zinc smelting dreg.In the system, batch mixer has lead and zinc smelting dreg entrance, chlorinating agent entrance, reducing agent entrance, binding agent entrance, compound outlet；Pelletizer has compound entrance, green-ball outlet, and compound entrance is connected with compound outlet；Chloridizing roaster is in staged, the feed zone reduced successively including level height, Qian Xin chlorinations area, zinc chloride volatilization area, chlorination lead volatility area, iron reducing zone, discharge zone, conveyer is provided with regional, baffle plate is provided between regional, so that each region forms the space of closing, the upper end of baffle plate is fixed on the furnace roof of chloridizing roaster, bottom can open or close, zinc chloride volatilization area is provided with the first flue, chlorination lead volatility area is provided with the second flue, feed zone is provided with green-ball entrance, discharge zone is provided with metallized pellet outlet, green-ball entrance is connected with green-ball outlet.The present invention realizes the separation of lead, zinc, iron, and energy consumption is smaller.
Description
Technical field
The present invention relates to field of solid waste treatment, and in particular to a kind of system and method for processing lead and zinc smelting dreg.
Background technology
Lead and zinc are indispensable important meals materials during the national economic development, in industrial production and human lives
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.
The scale and quantity of China's Lead-zinc Smelting Enterprises are expanding year by year, and lead zinc yield quickly increases, and smelting technique is obtained
Greater advance.But, lead-zinc smelting technological process is complicated, and the link for producing pollutant is more.The fast development of lead-zinc smelting, leads
The generation of large quantity of exhaust gas, sewage, waste residue etc. is caused, serious environmental pollution is caused.Wherein, the yield of waste residue is more.According to state
Family's development and the reform committee《Large solid waste utilizes embodiment》In statistics, China output in 2010 smelting give up
The quantity of slag is about 3.15 hundred million, wherein only the yield of lead and zinc smelting dreg has just reached 4,300,000 tons.
Because steel produces the difference of structure, the Zn-Pb-containing dusts that countries in the world steel plant produce also are not quite similar.In state
Outside, the increase of ratio and the increase of zinc-plated steel scrap proportioning in process for making due to electric furnace steel making, makes zincy lead electric furnace dust
Amount increases year by year.The Zn-Pb-containing dusts of foreign iron and steel factory are essentially from electric steelmaking process, next to that converter and blast furnace and other
Process.The steel plant in the most of provinces of south China are using the higher iron ore of zincy lead, and the Dust Capacity of blast furnace output is big, contains
Zinc, lead amount are higher.Meanwhile, the increase of zinc-plated sheet material and wear-resisting steel part usage amount, EAF steelmaking plant scale and electric furnace steel making ratio
Expansion, making the quantum of output of electric furnace dust increases, and zinc therein, lead content also increase.China's zincy lead Dust of Iron And Steel Works is main
It is blast furnace dust and electric furnace dust, next to that converter dust.
Lead and zinc smelting dreg is rich in the rare precious metal such as metallic iron and gallium, indium, gold, silver, also containing the poisonous member such as lead, cadmium, arsenic
Element and the strong metal of migration.Substantial amounts of lead and zinc smelting dreg uses the outdoor processing mode banked up or simply filled, and takes big
The soil of area, causes land resource in short supply.Over time, due to weathering and the effect of rain drop erosion, lead zinc
In metallic element meeting invading air, water body and soil in metallurgical slag, as important pollution sources.If without rational recovery
With utilization, the health of human and animal is not only endangered, the growth of influence plant and vegetation also results in the wave of valuable metal resource
Take.
At present, in lead-zinc smelting residues processing technique, pyrogenic attack technique is more ripe, more practical.But exist as follows
Problem：Products obtained therefrom is secondary dust and iron slag containing zinc, lead oxides mostly, or low-grade metal zinc, lead and
Molten iron；Processing procedure is main for the purpose of the iron in reclaiming smelting slag, and zinc lead secondary dust byproduct is used as zinc metallurgy or refines lead
Raw material；Zinc and lead after processing are not efficiently separated, and to utilize zinc, lead resource, it is necessary to which secondary dust is reprocessed,
Zinc and lead are separated, treatment process and cost is considerably increased.At present, there is no method to handle both at home and abroad, iron content is low, leaded high lead
Zinc smelting dreg, also not once property separation of Zinc, the report of lead.
The content of the invention
The present invention is directed to propose a kind of system and method for handling lead and zinc smelting dreg, the present invention can effectively solve the problem that lead zinc smelting
Refining slag stores up problem, realizes that lead in lead and zinc smelting dreg, zinc, ferrous metal are separately separated, energy consumption is relatively low, suitable for commercial Application.
The invention provides a kind of system for handling lead and zinc smelting dreg, including batch mixer, pelletizer, in addition to chloridising roasting
Stove.
The batch mixer has lead and zinc smelting dreg entrance, chlorinating agent entrance, reducing agent entrance, binding agent entrance, compound
Outlet.
The pelletizer has compound entrance, green-ball outlet；The compound of the compound entrance and the batch mixer
Outlet connection.
The chloridizing roaster is in staged, including feed zone, Qian Xin chlorinations area, the zinc chloride that level height is reduced successively
Conveyer is provided with volatilization area, chlorination lead volatility area, iron reducing zone, discharge zone, regional.The regional it
Between be provided with baffle plate so that the space of regional formation closing, the baffle plate has upper and lower end, its
In, the upper end of the baffle plate is fixed on the furnace roof of the chloridizing roaster, and the bottom can open or close.The chlorine
Change zinc volatilization area and be provided with the first flue, the chlorination lead volatility area is provided with the second flue.Also, the feed zone is provided with
Green-ball entrance, the discharge zone is provided with metallized pellet outlet, and the green-ball outlet of the green-ball entrance and the pelletizer connects
Connect.
It is preferred that, the angle of the baffle plate and vertical direction is 30~45 °.
It is preferred that, first flue is arranged on the top in the zinc chloride volatilization area, and close to the chlorination lead volatility
Area.Second flue is arranged on the top in the chlorination lead volatility area, and close to the iron reducing zone.
Further, in addition to drying unit, the drying unit receives the green-ball sent into by the pelletizer and dried
Dry-cure, then sends into the chloridizing roaster via the green-ball entrance.
Further, in addition to cooling device, mill ore magnetic selection device.The cooling device have metallized pellet entrance,
Cool down metallized pellet outlet.The metallized pellet entrance is connected with the metallized pellet outlet of the chloridizing roaster.Institute
Stating mill ore magnetic selection device has cooling metallized pellet entrance, iron outlet.The cooling metallized pellet entrance and the cooling
The cooling metallized pellet outlet connection of device.
Further, in addition to molten separating device, the molten separating device has metallized pellet entrance, iron outlet.The gold
Category pellet entrance is connected with the metallized pellet outlet of the chloridizing roaster.
The invention also provides a kind of method that utilization said system handles lead and zinc smelting dreg, including step：
A, lead and zinc smelting dreg, chlorinating agent, reducing agent, binding agent be well mixed, obtain compound.
B, by the compound pelletizing, obtain green-ball.
C, green-ball sent into the chloridizing roaster via the feed zone, be placed on the conveyer, it is described
Green-ball sequentially passes through the Qian Xin chlorinations area, zinc chloride volatilization area, chlorination lead volatility area, that quadrat zinc chlorination is entered in iron reducing zone is anti-
Should, zinc chloride volatilization, chlorination lead volatility, iron reduction reaction, respectively obtain zinc chloride dust, lead chloride dust, metallized pellet.
Wherein, the zinc chloride dust is volatized into first flue, and the lead chloride dust is volatized into second flue, institute
State metallized pellet and export discharge via the metallized pellet of the discharge zone.
It is preferred that, in the compound, the lead and zinc smelting dreg, chlorinating agent, reducing agent, the mass ratio of binding agent are 100：
(10~25):(5~15):(5~10).
It is preferred that, the temperature in the Qian Xin chlorinations area is 200~700 DEG C.The temperature in zinc chloride volatilization area for 700~
900℃.The temperature in the chlorination lead volatility area is 950~1150 DEG C.The temperature of the iron reducing zone is 1200~1300 DEG C.
Further, step is also included before step C：Processing is dried to the green-ball, containing for the green-ball is controlled
Water≤2wt%, is then fed into the chloridizing roaster.
The regional of chloridizing roaster is respectively set to the space of autonomous closure by the system of the present invention, can effectively control
The temperature and atmosphere of regional processed, it is ensured that lead in lead and zinc smelting dreg, zinc, iron are efficiently separated, and are saved postorder and are entered quadrat, zinc
The technique of separation.
Compared with traditional Rotary Kiln technique, the present invention can be solved using method stage extraction zinc, lead, the iron of chloridising roasting
The problem of certainly current lead and zinc smelting dreg can not be utilized effectively, in chloridizing roaster lead, zinc, iron can be achieved is separately separated.
Also, the characteristics of having low boiling, high volatile due to metal chloride, can realize in lead and zinc smelting dreg at a lower temperature
Lead, the separation and Extraction of zinc metal are reclaimed, and energy consumption is low.
Also, the method for chloridising roasting processing lead and zinc smelting dreg proposed by the present invention is equally applicable to other heavy metals or expensive
The separation and Extraction of metal.
Brief description of the drawings
Fig. 1 is the system schematic of processing lead and zinc smelting dreg in the embodiment of the present invention 1.
Fig. 2 is the system schematic of processing lead and zinc smelting dreg in the embodiment of the present invention 2.
Fig. 3 is the structural representation of chloridizing roaster.
Fig. 4 is the method flow schematic diagram of processing lead and zinc smelting dreg in the embodiment of the present invention.
Reference in accompanying drawing is as follows：
1st, batch mixer；2nd, pelletizer；3rd, drying unit；
4th, chloridizing roaster；4-1, feed zone；4-2, Qian Xin chlorination area；4-3, zinc chloride volatilization area；4-4, lead chloride are waved
Send out area；4-5, iron reducing zone；4-6, discharge zone；4-7, the first flue；4-8, the second flue；4-9, baffle plate；
5th, cooling device；6th, mill ore magnetic selection device；5 ＇, molten separating device.
Embodiment
Below in conjunction with drawings and examples, the embodiment to the present invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
Apply the purpose that example is only explanation, rather than limitation of the present invention.
As depicted in figs. 1 and 2, the system of present invention processing lead and zinc smelting dreg includes batch mixer 1, pelletizer 2, chloridising roasting
Stove 4.
Batch mixer 1 obtains compound for mixed material, and it has lead and zinc smelting dreg entrance, chlorinating agent entrance, reducing agent
Entrance, binding agent entrance, compound outlet.
Pelletizer 2 is used to compound compacting pelletizing obtaining green-ball, and it has compound entrance, green-ball outlet.Also, it is mixed
Material entrance is closed to be connected with the compound outlet of batch mixer 1.In the present invention, the preferred disc balling machine of pelletizer 2.
As shown in figure 3, chloridizing roaster 4 is in staged, it is staged horizontal reacting stove, chlorination is carried out for receiving green-ball
Calcination process, obtains metallized pellet and metal chloride dust.The sequencing that chloridizing roaster 4 passes through according to material is successively
It is divided into feed zone 4-1, Qian Xin chlorination area 4-2, zinc chloride volatilization area 4-3, chlorination lead volatility area 4-4, iron reducing zone 4-5, discharging
Area 4-6, from feed zone 4-1 to discharge zone 4-6, the position of regional is reduced successively in level height, so as to form ladder
Formula structure.Green-ball entrance is provided with feed zone 4-1, discharge zone is provided with metallized pellet outlet.Wherein, green-ball entrance is with making
The green-ball outlet connection of ball machine 2.It is preferred that, green-ball entrance is located at feed zone 4-1 upper end, and metallized pellet outlet is located at
Discharge zone 4-6 lower bottom end, is easy to material to be transmitted under gravity between each region.Also, in each area
Conveyer is provided between domain, for placing material, and conveying of the material between adjacent area is realized.It is preferred that, phase
Conveyer between neighbouring region is continuous, so as to ensure the continuous conveying of material.Further, conveyer is level
Set, or be obliquely installed.
In chloridizing roaster 4, between feed zone 4-1 and Qian Xin chlorination area 4-2, Qian Xin chlorinations area 4-2 and zinc chloride volatilize
Between area 4-3, between zinc chloride volatilization area 4-3 and chlorination lead volatility area 4-4, chlorination lead volatility area 4-4 and iron reducing zone 4-5 it
Between, between iron reducing zone 4-5 and discharge zone 4-6 baffle plate 4-9 is provided with, so that in chloridizing roaster 4 between each region
The space of independent closing is formed respectively.Wherein, each baffle plate 4-9 is respectively provided with upper and lower end.In the present invention, baffle plate
4-9 upper end is fixed on the furnace roof inwall of chloridizing roaster 4.Baffle plate 4-9 bottom can open or close.Work as thing
When material is transmitted between adjacent area, material can be under gravity or in the power of conveyer on conveyer
By baffle plate 4-9 under transmitting effect, now baffle plate is opened, and after material is by finishing, baffle plate is closed automatically, returns to closed
State.It is preferred that, baffle plate 4-9 is arranged at the charging aperture of each region upper end, is easy to open or is closed, with control material in phase
Turnover conveying between neighbouring region.As the preferred embodiment of the invention, the angle of baffle plate 4-9 and vertical direction is 30~45 °.
The first flue 4-7 is provided with zinc chloride volatilization area 4-3, the zinc chloride for reclaiming chlorination reaction process generation
Dust.It is preferred that, the first flue 4-7 is arranged on zinc chloride volatilization area 4-3 top, and close to chlorination lead volatility area 4-4.And
And, the second flue 4-8 is provided with chlorination lead volatility area 4-4, the lead chloride dust for reclaiming chlorination reaction process generation.
It is preferred that, the second flue 4-8 is arranged on chlorination lead volatility area 4-4 top, and close to iron reducing zone 4-5.
In the present invention, Qian Xin chlorinations area 4-2, zinc chloride volatilization area 4-3, chlorination lead volatility area 4-4, iron reducing zone are not limited
4-5, the first flue 4-7, the second flue 4-8, baffle plate 4-9 quantity.
As the preferred embodiment of the invention, the system further comprises drying unit 3, for receiving by the row of pelletizer 2
Processing is dried in the green-ball gone out.Drying unit 3 has green-ball entrance, dries green-ball outlet.Wherein, the green-ball of drying unit 3
Entrance is connected with the green-ball outlet of pelletizer 2, is dried green-ball outlet and is connected with the green-ball entrance of chloridizing roaster 4, is easy to pass through
The drying green-ball of drying is sent into via the green-ball entrance of chloridizing roaster 4.It is preferred that, the preferred drying baker of drying unit 3.
As the preferred embodiment of the invention, the system includes cooling device 5 and mill ore magnetic selection device 6.Wherein, cooling dress
Putting 5 is used to cool down metallized pellet, and it has metallized pellet entrance, the outlet of cooling metallized pellet.Also, the metallization ball
Group's entrance is connected with the metallized pellet outlet of chloridizing roaster 4.Mill ore magnetic selection device 6 is used to receive the metallization ball after cooling
Roll into a ball and carry out mill ore magnetic selection and reclaim iron, it has cooling metallized pellet entrance, iron outlet, tailings outlet.Also, cool down metal
Pellet entrance is connected with the cooling metallized pellet outlet of cooling device 5.
As another preferred embodiment of the invention, the system includes the molten ＇ of separating device 5, enters for receiving metallized pellet
The molten office reason of row reclaims iron, and it has metallized pellet entrance, iron outlet, melting slag outlet.Also, the metallized pellet entrance
It is connected with the metallized pellet outlet of chloridizing roaster 4.
As shown in figure 4, the invention also provides the system shown in a kind of utilization Fig. 1 or Fig. 2 handles the side of lead and zinc smelting dreg
Method, including step：
(1) mixing of raw material
Lead and zinc smelting dreg, chlorinating agent, reducing agent, binding agent are well mixed, compound is obtained.Wherein, the matter of each component
Measuring ratio is：Lead and zinc smelting dreg：Chlorinating agent：Reducing agent：Binding agent=100：(10~25):(5~15):(5~10).
In the present invention, the selection species of chlorinating agent is more, and substantial amounts of chlorine is contained in some waste materials, it is possible to achieve controlled with useless
It is useless, preferably calcium chloride in the present invention.Reducing agent selects carbon containing coal dust, preferably anthracite, such as coke powder, semi-coke.Binding agent is selected
Inorganic binder, preferably bentonite.
(2) pelletizing
Pelletizing in pelletizer 2 is fed the mixture into, green-ball is obtained.
(3) chloridising roasting of green-ball
Green-ball is sent into chloridizing roaster 4 via feed zone 4-1, is placed on conveyer.In the biography of conveyer
Send down, green-ball sequentially passes through Qian Xin chlorinations area 4-2, zinc chloride volatilization area 4-3, chlorination lead volatility area 4-4, iron reducing zone 4-5 and entered
Quadrat zinc chlorination reaction, zinc chloride volatilization, chlorination lead volatility, iron reduction reaction, respectively obtain zinc chloride dust, chlorination lead powder
Dirt, metallized pellet.Wherein, zinc chloride dust is volatized into the first flue 4-7, and lead chloride dust is volatized into the second flue 4-
8, metallized pellet is exported via discharge zone 4-6 metallized pellet and discharged.
It is preferred that, control water content≤2wt% of green-ball in the step (wt% is mass percent).It is preferred that, inciting somebody to action
Green-ball carries out including step before chloridising roasting processing：Green-ball is sent into drying unit 3 processing is dried.
In lead and zinc smelting dreg, because the metal chloride (i.e. lead chloride and zinc chloride) of lead, zinc has low boiling, high volatilization
The characteristics of property.Therefore, first by the chloride of lead, the oxide chlorination generation lead of zinc, zinc in lead and zinc smelting dreg in the present invention.Cause
This, the present invention is provided with Qian Xin chlorinations area 4-2 after feed zone 4-1, and forms independent and closing space respectively, so as to ensure
Chlorination reaction fully occurs for lead, the oxide of zinc, forms zinc chloride and lead chloride.Present invention control Qian Xin chlorinations area 4-2 parts
The temperature for occurring chlorination reaction is 200~700 DEG C, and the zinc chloride generated in the temperature range, lead chloride are in solid-state.
In the present invention, the reaction carried out in zinc chloride volatilization area 4-3 is the chlorination and volatilization of zinc oxide.Also, control
Zinc chloride volatilization area 4-3 temperature is 700 DEG C~900 DEG C.It is preferred that, the temperature for controlling zinc chloride volatilization area 4-3 is preferably 800
DEG C~900 DEG C.In the temperature range, it is ensured that the zinc chloride that chlorination reaction is obtained is in volatilizable zinc chloride dust, then
It is collected into the first flue 4-7.
The reaction carried out in chlorination lead volatility area 4-4 is the chlorination and volatilization of lead oxides.Also, control chlorination lead volatility
Area 4-4 temperature is 950 DEG C~1150 DEG C.It is preferred that, the temperature for controlling chlorination lead volatility area 4-4 is 1000 DEG C~1150 DEG C.
In the temperature range, it is ensured that the lead chloride that chlorination reaction is obtained is in volatilizable lead chloride dust.Subsequently enter second
Flue 4-8 is collected.
Also, cause zinc chloride volatilization area 4-3 and chlorination lead volatility area 4-4 difference in the presence of baffle plate 4-9 in systems
Form the space of autonomous closure so that temperature and atmosphere between two regions are not influenceed by adjacent area.Therefore, may be used
To ensure that zinc chloride dust and lead chloride dust respectively enter the first flue 4-7 and the second flue 4-8, the separation of zinc, lead is realized
Reclaim.
In the present invention, in lead and zinc smelting dreg, the volatility of lead reaches more than 95.6%, the volatility of zinc reach 97.5% with
On.
Green-ball is sequentially passed through after lead zinc chlorination reaction, zinc chloride volatilization, chlorination lead volatility, and obtained iron content pelletizing is delivered to
In the 4-5 of iron reducing zone.Due to containing reducing agent in pelletizing, then under iron reducing zone 4-5 hot conditions, the iron oxidation in pelletizing
Reduction reaction, the metallized pellet after being reduced occur for thing.In the present invention, the temperature for controlling iron reducing zone 4-5 is 1200 DEG C
~1300 DEG C, it is ensured that the abundant reduction of ferriferous oxide.It is preferred that, the temperature for controlling iron reducing zone 4-5 is 1250 DEG C~1300 DEG C.
(4) iron in metallized pellet is reclaimed
As one of embodiment of the present invention, metallized pellet carries out mill ore magnetic selection processing, obtains gold after cooling
Belong to iron and tailings, wherein, metal Iron grade is>92%, the rate of recovery>93%.
As other embodiments of the invention, metallized pellet carries out molten office reason, obtains metallic iron and melting slag, its
In, metal Iron grade is>95%, the rate of recovery>96%.
Also, above-mentioned mill ore magnetic selection process and molten point of process use conventional treatment process.
Embodiment 1
In the present embodiment, the composition of lead and zinc smelting dreg is：All iron content 25.22wt%, lead content 3.25wt%, Zn content
4.55wt%.Lead and zinc smelting dreg, calcium chloride, coke powder, bentonite are 100 according to mass ratio：10：15：5 carry out mixed pelletizing, obtain
To green-ball dry to water content≤2wt%, and send into chloridizing roaster.Wherein, the temperature in Qian Xin chlorinations area be 500 DEG C ±
15 DEG C, zinc chloride volatilization area's temperature is 850 DEG C ± 10 DEG C, and chlorination lead volatility area temperature is 1000 DEG C ± 15 DEG C.Through chlorination, volatilization
Reaction, obtained zinc chloride dust is volatized into the first flue, and the volatility of zinc reaches 97.62%, obtained lead chloride dust
The second flue is volatized into, the volatility of lead reaches 96.26%.Iron content pelletizing after lead zinc chloride-sublimation enters iron reduction
Area, the regional temperature is 1250 DEG C ± 30 DEG C, and ferriferous oxide occurs reduction reaction with coke powder and obtains metallized pellet, through discharge zone
It is expelled in cooling device, then carries out mill ore magnetic selection recovery and obtain iron, Iron grade is 92.5%, and the rate of recovery is 93.2%.
Embodiment 2
In the present embodiment, the composition of lead and zinc smelting dreg is：All iron content 22wt%, lead content 4wt%, Zn content
17wt%.Lead and zinc smelting dreg, calcium chloride, semi-coke, bentonite are 100 according to mass ratio：25：5：10 carry out mixed pelletizing, obtain
Green-ball dry to water content≤2wt%, and send into chloridizing roaster.Wherein, the temperature in Qian Xin chlorinations area is 550 DEG C ± 15
DEG C, zinc chloride volatilization area's temperature is 850 DEG C ± 10 DEG C, and chlorination lead volatility area temperature is 1050 DEG C ± 15 DEG C.It is anti-through chlorination, volatilization
Should, obtained zinc chloride dust is volatized into the first flue, and the volatility of zinc reaches 98.05%, and obtained lead chloride dust is waved
Hair enters the second flue, and the volatility of lead reaches 97.03%.Iron content pelletizing after lead zinc chloride-sublimation enters iron reduction
Area, the regional temperature is 1250 DEG C ± 30 DEG C, and ferriferous oxide occurs reduction reaction with semi-coke and obtains metallized pellet, through discharge zone
It is expelled to the molten office reason recovery of progress in molten separating device and obtains iron, Iron grade is 95.6%, and the rate of recovery is 96.8%.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, it can also do on the basis of the above description
Go out other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out is still in protection scope of the present invention.
Claims (10)
1. a kind of system for handling lead and zinc smelting dreg, including batch mixer, pelletizer, it is characterised in that also including chloridizing roaster；
The batch mixer has lead and zinc smelting dreg entrance, chlorinating agent entrance, reducing agent entrance, binding agent entrance, compound outlet；
The pelletizer has compound entrance, green-ball outlet；The compound of the compound entrance and the batch mixer is exported
Connection；
The chloridizing roaster volatilizees in staged, including feed zone, Qian Xin chlorinations area, zinc chloride that level height is reduced successively
Conveyer is provided with area, chlorination lead volatility area, iron reducing zone, discharge zone, regional；Between the regional
It is provided with baffle plate so that the space of the regional formation closing, the baffle plate has upper and lower end, wherein, institute
The upper end for stating baffle plate is fixed on the furnace roof of the chloridizing roaster, and the bottom can open or close；The zinc chloride
Volatilization area is provided with the first flue, and the chlorination lead volatility area is provided with the second flue；Also, the feed zone is provided with green-ball
Entrance, the discharge zone is provided with metallized pellet outlet, and the green-ball entrance is connected with the green-ball outlet of the pelletizer.
2. system according to claim 1, it is characterised in that the baffle plate and the angle of vertical direction are 30~45 °.
3. system according to claim 1, it is characterised in that first flue is arranged on the zinc chloride volatilization area
Top, and close to the chlorination lead volatility area；Second flue is arranged on the top in the chlorination lead volatility area, and close to institute
State iron reducing zone.
4. system according to claim 1, it is characterised in that also including drying unit, the drying unit is received by institute
The green-ball for stating pelletizer feeding carries out drying and processing, is then sent into via the green-ball entrance in the chloridizing roaster.
5. system according to claim 1, it is characterised in that also including cooling device, mill ore magnetic selection device；The cooling
Device has metallized pellet entrance, the outlet of cooling metallized pellet；The metallized pellet entrance and the chloridizing roaster
Metallized pellet outlet connection；The mill ore magnetic selection device has cooling metallized pellet entrance, iron outlet；The cooling gold
Category pellet entrance is connected with the cooling metallized pellet outlet of the cooling device.
6. system according to claim 1, it is characterised in that also including melting separating device, the molten separating device has metal
Pellet entrance, iron outlet；The metallized pellet entrance is connected with the metallized pellet outlet of the chloridizing roaster.
7. the method that a kind of any described systems of utilization claim 1-6 handle lead and zinc smelting dreg, it is characterised in that including step
Suddenly：
A, lead and zinc smelting dreg, chlorinating agent, reducing agent, binding agent be well mixed, obtain compound；
B, by the compound pelletizing, obtain green-ball；
C, green-ball sent into the chloridizing roaster via the feed zone, be placed on the conveyer, the green-ball
Sequentially pass through the Qian Xin chlorinations area, zinc chloride volatilization area, chlorination lead volatility area, iron reducing zone and enter quadrat zinc chlorination reaction, chlorine
Change zinc volatilization, chlorination lead volatility, iron reduction reaction, respectively obtain zinc chloride dust, lead chloride dust, metallized pellet；Wherein,
The zinc chloride dust is volatized into first flue, and the lead chloride dust is volatized into second flue, the gold
Belong to pellet and export discharge via the metallized pellet of the discharge zone.
8. method according to claim 7, it is characterised in that in the compound, the lead and zinc smelting dreg, chlorinating agent,
Reducing agent, the mass ratio of binding agent are 100：(10~25):(5~15):(5~10).
9. method according to claim 7, it is characterised in that the temperature in the Qian Xin chlorinations area is 200~700 DEG C；Institute
The temperature for stating zinc chloride volatilization area is 700~900 DEG C；The temperature in the chlorination lead volatility area is 950~1150 DEG C；The iron is also
The temperature in former area is 1200~1300 DEG C.
10. method according to claim 7, it is characterised in that also include step before step C：The green-ball is carried out
Drying process, controls water content≤2wt% of the green-ball, is then fed into the chloridizing roaster.
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| CN108034812A (en) * | 2017-11-15 | 2018-05-15 | 江苏省冶金设计院有限公司 | A kind of processing method of lead cadmia |
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| CN110938744A (en) * | 2019-11-25 | 2020-03-31 | 重庆科技学院 | Lead-zinc chloride separation method in steelmaking dust resource recovery process |
| CN112813277A (en) * | 2020-12-28 | 2021-05-18 | 中南大学 | Method for separating and recovering valuable metals from copper smelting slag through chlorination roasting |
| CN115190915A (en) * | 2020-02-28 | 2022-10-14 | 蒂森克虏伯钢铁欧洲股份公司 | Sustainable reprocessing method for smelter dust and sludge for producing iron-containing, lean heavy metal secondary feed and recovering lead and zinc |
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| CN110938744B (en) * | 2019-11-25 | 2021-04-02 | 重庆科技学院 | Lead-zinc chloride separation method in steelmaking dust resource recovery process |
| CN115190915A (en) * | 2020-02-28 | 2022-10-14 | 蒂森克虏伯钢铁欧洲股份公司 | Sustainable reprocessing method for smelter dust and sludge for producing iron-containing, lean heavy metal secondary feed and recovering lead and zinc |
| CN112813277A (en) * | 2020-12-28 | 2021-05-18 | 中南大学 | Method for separating and recovering valuable metals from copper smelting slag through chlorination roasting |
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