CN106086279A - The method and system of the direct-reduction of wet method zinc smelting dreg - Google Patents
The method and system of the direct-reduction of wet method zinc smelting dreg Download PDFInfo
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- CN106086279A CN106086279A CN201610618836.7A CN201610618836A CN106086279A CN 106086279 A CN106086279 A CN 106086279A CN 201610618836 A CN201610618836 A CN 201610618836A CN 106086279 A CN106086279 A CN 106086279A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
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Abstract
The invention discloses the method and system of the direct-reduction of wet method zinc smelting dreg.Wherein, the method includes: with coal and calcium based additives, dry zinc leaching residue is carried out mixed processing, in order to obtain mixture；It is shaped described mixture processing, in order to obtain mixed material agglomerate；Described mixed material agglomerate is carried out reduction roasting process, in order to obtain flue dust and the reduction agglomerate of argentiferous, lead, zinc and indium；Described reduction agglomerate carries out broken discharging process, in order to obtain iron content granulate mixture material；Described iron content granulate mixture material is carried out sorting process, in order to obtain metallic iron product.The method, by the feed with addition of calcium based additives, can promote that ferrum reduces, and promotes lead, zinc, silver and the volatilization of indium, the removal efficiency of lead, zinc, silver and indium is high, and calcium based additives can also react with containing sulfur minerals in slag, reduce sulfur and the combination of ferrum phase, make the sulfur content of iron product reduce.
Description
Technical field
The present invention relates to the direct reduction process of wet method zinc smelting dreg, and implement directly going back of aforementioned wet method zinc smelting dreg
The system of former method.
Background technology
In a large amount of lead smelting gas that Zinc Hydrometallurgy Process produces, the most all contain dissipated metal, noble metal and other have valency golden
Belong to, typically divide direct method and indirect method two class to the recovery process of these metals.Direct method is using lead smelting gas as primary raw material, choosing
Select technique aptly the valuable metal in slag is reclaimed.
Zinc hydrometallurgy is the most most widely used current zinc metallurgy method, and the electric zinc yield produced by the method accounts for always
The 85% of zinc yield.Zinc hydrometallurgy has conventional solvent extraction method, volatility process hot acid leaching, hot acid to leach hematite process, hot acid leaching
Go out goethite process, oxygen leaching method etc..
In Zinc Hydrometallurgy Process, leaching the cadmia obtained in using two sections typically has two kinds of techniques to reclaim, and one is fire
Method, i.e. uses rotary kiln evaporation method；Another kind is wet method, i.e. hot acid solvent extraction method.In cadmia, the form that is primarily present of zinc is ferrous acid
Zinc, zinc oxide, zinc sulfide and zinc silicate, indium is mainly, in the materials such as the existence of class matter in-phase version and zinc ferrite, to divide at zinc ferrite
While solution, indium reduces after being also decomposed, and is changed in gas entrance rotary kiln flue gas and reclaims.Silver mainly with Argentous sulfide.,
A small amount of native silver and parcel silver exist.Rotary kiln evaporation method is the typical process that China's zinc hydrometallurgy Slag treatment uses, domestic warp
Crossing the development in more than 30 years, its technology is the most ripe, and the existing more zine-smelting plant with strain smelting as representative uses.Zinc kiln slag is wet method
Leached mud during zinc metallurgy again with addition of 40%～50% coke powder, operating condition difference needs to allocate into the coke powder of 80%～100%,
The residue after the metal such as zinc, lead is extracted under high temperature in rotary kiln.By again being leached by kiln slag, acid consumption is huge.Separately
Outward, 92～94% zinc and 82～84% lead and the silver of about 10% can be reclaimed by rotary kiln fuming volatilization, the volatility of indium <
80%.The advantage of kiln process is that the volatilization response rate of lead and zinc is high, but shortcoming is the most clearly.First, kiln process is to silver
Recovering effect excessively poor, the overwhelming majority silver can not reclaim, 70% remain in volatilization kiln slag in, and kiln slag select further silver return
Yield also after 50～65%, cause a large amount of losses of noble metal.For in cadmia～22% ferrum also fully enter kiln slag
In, being separated by magnetic separation, Iron concentrate grade can reach more than 68%, but sulfur content is up to 3%, and Iron concentrate is difficult to sell.
Thus, the existing method utilizing zinc hydrometallurgy to prepare ferrum haves much room for improvement.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.To this end, one object of the present invention
It is to propose the direct reduction process of a kind of wet method zinc smelting dreg, by entering calcium based additives in dispensing, ferrum can be promoted to reduce,
Reduce slag melting point, promote lead, zinc, the volatilization of indium.
According to an aspect of the present invention, the invention provides the direct reduction process of a kind of wet method zinc smelting dreg.According to
Embodiments of the invention, the method includes: with coal and calcium based additives, dry zinc leaching residue is carried out mixed processing, in order to
To mixture；It is shaped described mixture processing, in order to obtain mixed material agglomerate；Described mixed material agglomerate is carried out
Reduction roasting processes, in order to obtain flue dust and the reduction agglomerate of argentiferous, lead, zinc and indium；Described reduction agglomerate is broken off
Material processes, in order to obtain iron content granulate mixture material；Described iron content granulate mixture material is carried out sorting process, in order to obtain gold
Belong to iron product.
The direct reduction process of wet method zinc smelting dreg according to embodiments of the present invention, by adding with addition of calcio in the feed
Agent, can promote that ferrum reduces, and improves the fusing point of pelletizing, promotes lead, zinc, silver and the volatilization of indium, and the removal efficiency of lead, zinc, silver and indium is high,
And calcium based additives can also react with containing sulfur minerals in slag, reduce sulfur and the combination of ferrum phase, make the sulfur content of iron product
Reduce.Additionally, the technological process of the method is short, it is easy to operation, production cost is low.
It addition, the direct reduction process of wet method zinc smelting dreg according to the above embodiment of the present invention, it is also possible to have as follows
Additional technical characteristic:
According to embodiments of the invention, in described mixed processing, the dry slag of described coal and described dry zinc leaching residue
Mass ratio is (10-30): 100.
According to embodiments of the invention, in described mixed processing, described calcium based additives and described dry zinc leaching residue
The mass ratio of dry slag be (15-35): 100, it is preferable that for (20-35): 100.
According to embodiments of the invention, described calcium based additives is selected from least one of calcium hydroxide and limestone.
According to embodiments of the invention, the particle diameter of described dry zinc leaching residue is not more than 3 millimeters.
According to embodiments of the invention, described iron content granulate mixture material granularity is not more than 2mm.
According to embodiments of the invention, the temperature that described reduction roasting processes is 1280～1350 DEG C, the time be 15～
30min。
According to embodiments of the invention, the method farther includes: removed by the flue dust of described argentiferous, lead, zinc and indium
Dirt processes, in order to obtain the dust of argentiferous, lead, zinc and indium and the flue gas of purification.
According to a further aspect in the invention, the invention provides a kind of direct-reduction side implementing aforementioned wet method zinc smelting dreg
The system of method.According to embodiments of the invention, this system includes: mixing device, and described mixing device has dry zinc and leaches
Slag entrance, coal entrance, calcium based additives entrance and mixture outlet；Shaped device, described shaped device has mixture inlet
With mixed material lump outlet, described mixture inlet is connected with described mixture outlet；Reduction roasting device, described reduction roasts
Burn device and there is the flue dust outlet of mixed material agglomerate entrance, reduction lump outlet and argentiferous, lead, zinc and indium, described mixture
Dough block entrance is connected with described mixed material lump outlet；Spiral discharging machine, described spiral discharging machine is arranged on reduction agglomerate
Exit, has reduction agglomerate entrance and broken material outlet, and described reduction agglomerate entrance is connected with described reduction lump outlet；
And separator, described in have and treat sorting material entrance, metallic iron products export and slag-drip opening, described in treat sorting material entrance with
The outlet of described broken material is connected.
The system of the direct-reduction of wet method zinc smelting dreg according to embodiments of the present invention, by arranging calcium on mixing device
Based additive entrance, in the feed with addition of calcium based additives, can promote that ferrum reduces, and improves the fusing point of pelletizing, promotes lead, zinc, silver
With the volatilization of indium, the removal efficiency of lead, zinc, silver and indium is high, and calcium based additives can also react with containing sulfur minerals in slag, subtracts
Few sulfur and the combination of ferrum phase, make the sulfur content of iron product reduce.Additionally, the simple in construction of this system, it is easy to operation, the throwing of system
Money low cost.
According to embodiments of the invention, described reduction roasting device is rotary hearth furnace.
According to embodiments of the invention, this system farther includes: dust arrester, and described dust arrester has flue dust and enters
Mouth, dust outlet and the exhanst gas outlet of purification, described flue dust entrance exports with the described flue dust of described reduction roasting device and is connected.
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 shows the flow process signal of the method for the direct-reduction of wet method zinc smelting dreg according to an embodiment of the invention
Figure；
Fig. 2 shows that the flow process of the method for the direct-reduction of the wet method zinc smelting dreg according to another embodiment of the present invention is shown
It is intended to；
Fig. 3 shows the structural representation of the system of the direct-reduction of wet method zinc smelting dreg according to an embodiment of the invention
Figure；
Fig. 4 shows that the structure of the system of the direct-reduction of the wet method zinc smelting dreg according to another embodiment of the present invention is shown
It is intended to.
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, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, term " longitudinally ", " laterally ", " on ", D score, "front", "rear", "left", "right", " perpendicular
Directly ", " level ", " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, be only
For the ease of describing the present invention rather than requiring that the present invention must be with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.
It should be noted that term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint phase
To importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", " second " feature permissible
Express or implicitly include one or more this feature.Further, in describing the invention, unless otherwise saying
Bright, " multiple " are meant that two or more.
According to an aspect of the present invention, the invention provides a kind of method preparing ferrum.With reference to Fig. 1, according to the present invention
Embodiment, the method is explained, the method includes:
S100 mixed processing
According to embodiments of the invention, dry zinc leaching residue is carried out mixed processing with coal and calcium based additives, obtains
Mixture.Thus, by the feed with addition of calcium based additives, can promote that ferrum reduces, reduce slag melting point, promote lead, zinc, silver and
The volatilization of indium, the removal efficiency of lead, zinc, silver and indium is high, and calcium based additives can also react with containing sulfur minerals in slag, reduces
Sulfur and the combination of ferrum phase, make the sulfur content of iron product reduce.
According to embodiments of the invention, in mixed processing, coal is (10-with the mass ratio of the dry slag of the zinc leaching residue being dried
30): 100.Thus, the reduction effect of zinc leaching residue is good, and efficiency is high, and the response rate of ferrum is high, and sulfur content is low.If the ratio of coal
Too low, it is not enough to realize the reduction of compound in slag, and maintains the reducing atmosphere around pelletizing.And the ratio of coal is too high,
Then in pelletizing, sulfur content increases, and can cause during sulfur enters abrasive grit in pelletizing, makes the sulfur content of iron product raise.
According to embodiments of the invention, in mixed processing, the quality of the dry slag of calcium based additives and dry zinc leaching residue
Than being (15-35): 100.Thus, the caking property of pelletizing is good, and the fusing point of pelletizing is high, and the removal efficiency of lead, zinc, silver and indium is high.According to
The preferred embodiments of the present invention, in mixed processing, calcium based additives is (20-with the mass ratio of the dry slag of the zinc leaching residue being dried
35): 100.Thus, in reduction process, agglomerate expands, and reduction agglomerate, through discharge zone, is rubbed by spiral discharging machine and contained
Ferrum granulate mixture material, more preferably, the fusing point of pelletizing can improve to more than 1300 DEG C the caking property of pelletizing, taking off of lead, zinc, silver and indium
Except rate is the highest.
According to embodiments of the invention, calcium based additives is selected from least one of calcium hydroxide and limestone.Wherein, hydrogen-oxygen
Change calcium and can improve the caking property of mixed material, beneficially balling-up, and, the fusing point of the improved pelletizing of calcium hydroxide and limestone
To more than 1300 DEG C, calorific intensity is relatively low makes pelletizing that automatic efflorescence to occur in discharge zone, and abrasive grit and slag are automatically separated, and save pelletizing
Broken grinding process.
According to embodiments of the invention, the particle diameter of dry zinc leaching residue is not more than 3 millimeters.Thus, the grain of zinc leaching residue
Spending little, make raw material contact fully, reduction efficiency is high, and the temperature that reduction roasting processes is low.
S200 forming processes
According to embodiments of the invention, it is shaped mixture processing, obtains mixed material agglomerate.Thus, grain is formed
The mixed material agglomerate that footpath is suitable, it is simple to carry out follow-up reduction roasting and process.
S300 reduction roasting processes
According to embodiments of the invention, mixed material agglomerate is carried out reduction roasting process, obtain argentiferous, lead, zinc and indium
Flue dust and reduction agglomerate.Thus, processed by reduction roasting and make the oxide in the second mixed material agglomerate reduce, contained
The flue dust of silver, lead, zinc and indium and the reduction agglomerate containing metallic iron product.
According to embodiments of the invention, the temperature that reduction roasting processes is 1280～1350 DEG C, and the time is 15～30min.
Thus, in pelletizing, the evaporation rate of volatile matter is fast, and volatile matter volatilization makes pelletizing be internally formed expansion, crack, promote further lead,
The volatilization of zinc, indium and silver, the especially volatility of silver significantly improve, according to some embodiments of the present invention, silver volatility up to
More than 98%.If reduction temperature is too low, pelletizing ferrum granule can not agglomeration, it is impossible to obtain iron content granulate mixture material；As
Really reduction temperature is too low, and lead zinc evaporation rate is slow simultaneously, is also unfavorable for obtaining higher lead, zinc, silver, the removal efficiency of indium, unfavorable
In pelletizing expand, and then can not get calorific intensity, discharge zone occur automatic efflorescence pelletizing, abrasive grit and slag cannot divide automatically
From.And reduction temperature is too high, pellets can be caused, increase energy consumption simultaneously, and, overlong time can cause carbon scaling loss in pelletizing
Seriously, there is secondary oxidation.
S400 crushes discharging and processes
According to embodiments of the invention, reduction agglomerate is carried out broken discharging and processes, obtain iron content granulate mixture material.By
This, iron content granule separates with ground-slag, it is simple to follow-up separation processes and obtains metallic iron product.
According to some embodiments of the present invention, this broken discharging processes after can passing through reduction agglomerate cooling is expanded efflorescence
Spiral discharging machine rubbing is utilized to carry out.Thus, the processing method that broken discharging processes is simple, it is easy to operation, and, broken
Efficiency is high, effective.
S500 sorting process
According to embodiments of the invention, iron content granulate mixture material is carried out sorting process, obtains metallic iron product.By
This, pass through sorting process, it is achieved slag sluicing system, obtains metallic iron product.
With reference to Fig. 2, according to embodiments of the invention, the method farther includes:
S600 dust removal process
According to embodiments of the invention, the flue dust of argentiferous, lead, zinc and indium is carried out dust removal process, in order to obtain argentiferous,
The dust of lead, zinc and indium and the flue gas of purification.Thus, from flue dust, the silver of high economic worth, lead, zinc and indium are reclaimed, it is achieved that
The abundant recycling of zinc leaching residue, it is to avoid the waste of resource.
The method preparing ferrum according to embodiments of the present invention, by the feed with addition of calcium based additives, can promote ferrum also
Former, reduce slag melting point, promote lead, zinc, silver and the volatilization of indium, the removal efficiency of lead, zinc, silver and indium is high, and calcium based additives is also
Can react with containing sulfur minerals in slag, reduce sulfur and the combination of ferrum phase, make the sulfur content of iron product reduce.Additionally, the method
Technological process short, it is easy to operation, production cost is low.
According to a further aspect in the invention, the invention provides a kind of system implementing the aforementioned method preparing ferrum.Reference
Fig. 3, according to embodiments of the invention, explains this system preparing ferrum, and this system includes: mixing device 100, one-tenth
Type device 200, reduction roasting device 300, spiral discharging machine 400 and separator 500.Below each device is explained one by one
Bright:
Mixing device 100: according to embodiments of the invention, this mixing device 100 has dry zinc leaching residue entrance
101, coal entrance 102, calcium based additives entrance 103 and mixture outlet 104, this mixing device 100 is for by dry zinc leaching
Slag tap and coal and calcium based additives carry out mixed processing, obtain mixture.Thus, arrange calcio by mixing device 100 to add
Agent entrance, in the feed with addition of calcium based additives, can promote that ferrum reduces, and reduces slag melting point, promotes lead, zinc, silver and the volatilization of indium,
The removal efficiency of lead, zinc, silver and indium is high, and calcium based additives can also react with containing sulfur minerals in slag, reduces sulfur and ferrum phase
Combination, make the sulfur content of iron product reduce.
According to embodiments of the invention, in mixed processing, coal is (10-with the mass ratio of the dry slag of the zinc leaching residue being dried
30): 100.Thus, the reduction effect of zinc leaching residue is good, and efficiency is high, and the response rate of ferrum is high, and sulfur content is low.If the ratio of coal
Too low, it is not enough to realize the reduction of compound in slag, and maintains the reducing atmosphere around pelletizing.And the ratio of coal is too high,
Then in pelletizing, sulfur content increases, and can cause during sulfur enters abrasive grit in pelletizing, makes the sulfur content of iron product raise.
According to embodiments of the invention, in mixed processing, the quality of the dry slag of calcium based additives and dry zinc leaching residue
Than being (15-35): 100.Thus, the caking property of pelletizing is good, and the fusing point of pelletizing is high, and the removal efficiency of lead, zinc, silver and indium is high.According to
The preferred embodiments of the present invention, in mixed processing, calcium based additives is (20-with the mass ratio of the dry slag of the zinc leaching residue being dried
35): 100.Thus, more preferably, the fusing point of pelletizing can improve to more than 1300 DEG C the caking property of pelletizing；Meanwhile, obtain goes back protocorm
Group's calorific intensity is relatively low, makes pelletizing that automatic efflorescence to occur in discharge zone, and abrasive grit and slag are automatically separated, and save pelletizing pulverizing grinder miner
Skill.
According to embodiments of the invention, calcium based additives is selected from least one of calcium hydroxide and limestone.Wherein, hydrogen-oxygen
Change calcium and can improve the caking property of mixed material, beneficially balling-up, and, the fusing point of the improved pelletizing of calcium hydroxide and limestone
To more than 1300 DEG C, pelletizing calorific intensity after carrying out reduction is relatively low makes pelletizing that automatic efflorescence to occur in discharge zone, and abrasive grit and slag are automatic
Separate, save pelletizing and crush grinding process.
According to embodiments of the invention, the particle diameter of dry zinc leaching residue is not more than 3 millimeters.Thus, the grain of zinc leaching residue
Spending little, make raw material contact fully, reduction efficiency is high, and the temperature that reduction roasting processes is low.
Shaped device 200: according to embodiments of the invention, this shaped device 200 has mixture inlet 201 and mixture
Material lump outlet 202, wherein, mixture inlet 201 is connected with mixture outlet 104, is shaped mixture processing, obtains
Mixed material agglomerate.Thus, the mixed material agglomerate that particle diameter is suitable is formed, it is simple to carry out follow-up reduction roasting and process.
Reduction roasting device 300: according to embodiments of the invention, this reduction roasting device 300 has mixed material agglomerate
The flue dust outlet 303 of entrance 301, reduction lump outlet 302 and argentiferous, lead, zinc and indium, wherein, mixed material agglomerate entrance 301
Be connected with mixed material lump outlet 202, for mixed material agglomerate is carried out reduction roasting process, obtain argentiferous, lead, zinc and
The flue dust of indium and reduction agglomerate.Thus, processed by reduction roasting and make the oxide in the second mixed material agglomerate reduce, obtain
The flue dust of argentiferous, lead, zinc and indium and the reduction agglomerate containing metallic iron product.
According to embodiments of the invention, reduction roasting device 300 is rotary hearth furnace.Thus, reduction efficiency is high, effective.Root
According to some embodiments of the present invention, the outlet area of rotary hearth furnace can arrange water-cooling wall, carries out metallized pellet cooling down expanding powder
Change, it is simple to follow-up broken.
According to embodiments of the invention, it is 1280～1350 that reduction roasting device 300 carries out the temperature of reduction roasting process
DEG C, the time is 15～30min.Thus, in pelletizing, the evaporation rate of volatile matter is fast, and it is swollen that volatile matter volatilization makes pelletizing be internally formed
Swollen, crack, promotes that the volatilization of lead, zinc, indium and silver, the especially volatility of silver significantly improve, according to the one of the present invention further
A little embodiments, silver volatility is up to more than 98%.If reduction temperature is too low, pelletizing ferrum granule can not agglomeration, be unfavorable for
Pelletizing expands.And reduction temperature is too high, pellets can be caused, increase energy consumption simultaneously, and, overlong time can cause in pelletizing
Carbon scaling loss is serious, and secondary oxidation occurs.Simultaneously as at 1280～1350 DEG C, under the conditions of the time is 15～30min, in pelletizing
Portion's direct reduction reactor is violent, and pelletizing is internally formed expansion, crack, and discharging pre reduction agglomerate calorific intensity is low.
Spiral discharging machine 400: according to embodiments of the invention, spiral discharging machine 400 is arranged at reduction lump outlet, tool
Having reduction agglomerate entrance 401 and broken material outlet 402, wherein, reduction agglomerate entrance 401 is connected with reduction lump outlet 302,
Reduction agglomerate carries out broken discharging process, obtain iron content granulate mixture material.Thus, iron content granule separates with ground-slag, it is simple to
Follow-up separation processes and obtains metallic iron product.
Separator 500: according to embodiments of the invention, this separator 500 has treats sorting material entrance 501, metallic iron
Products export 502 and slag-drip opening 503, wherein, treat that sorting material entrance 501 is connected with broken material outlet, and this separator 500 will
Iron content granulate mixture material carries out sorting process, obtains metallic iron product.Thus, sorting process is passed through, it is achieved slag sluicing system,
To metallic iron product.
With reference to Fig. 4, according to embodiments of the invention, this system farther includes:
Dust arrester 600: according to embodiments of the invention, this dust arrester 600 has flue dust entrance 601, dust outlet
602 and the exhanst gas outlet 603 that purifies, wherein, the flue dust of flue dust entrance 601 and reduction roasting device 300 exports 303 and is connected, this
The flue dust of argentiferous, lead, zinc and indium is carried out dust removal process by dust arrester 600, obtains dust and the purification of argentiferous, lead, zinc and indium
Flue gas.Thus, from flue dust, the silver of high economic worth, lead, zinc and indium are reclaimed, it is achieved that the synthetical recovery profit of zinc leaching residue
With.
Below with reference to specific embodiment, the present invention will be described, it should be noted that these embodiments are only explanation
Property, and be not considered as limiting the invention.
Embodiment 1
The method utilizing the embodiment of the present invention carries out the direct-reduction of wet method zinc smelting dreg and prepares ferrum, specifically comprises the following steps that
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 16.34%, and lead content is 5.11%, SiO2Content is
8～10%, silver content is 140g/t, and indium content is 320g/t, and iron content is 27%, and slag after drying is crushed to below 3mm,
Obtain zinc leaching residue granule.
(2) adding reduction coal and slaked lime in zinc leaching residue granule, wherein, the amount of allocating into of reduction coal is dry slag weight
20%, the amount of allocating into of slaked lime is the 18% of dry slag weight.
(3) mixture of cadmia, reduction coal and slaked lime step (2) obtained adds water and mixes and enter through former
Row pressure ball, measuring pelletizing fall strength of briquette is 12 times, can substantially meet rotary hearth furnace and enter stove requirement of strength.
(4) after molding, pelletizing is dried to moisture less than 4%, carries out reduction roasting in sending into direct-reduction rotary hearth furnace.In stove
Reduction temperature is 1350 DEG C, and the recovery time is 20min, obtains reduction agglomerate, and in this reduction agglomerate, the full ferrum in abrasive grit reaches
More than 98%, sulfur content is 0.06%, and iron recovery reaches more than 93%, and in reduction agglomerate, Zn content is 0.89%, lead content
Being 0.22%, silver content is 12g/t, and indium content is 89g/t.
Embodiment 2
The method utilizing the embodiment of the present invention carries out the direct-reduction of wet method zinc smelting dreg and processes, and specifically comprises the following steps that
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 16.34%, and lead content is 5.11%, and SiO2 content is
8～10%, silver content is 140g/t, and indium content is 320g/t, and iron content is 27%, and slag after drying is crushed to below 3mm,
Obtain zinc leaching residue granule.
(2) adding reduction coal and slaked lime in zinc leaching residue granule, wherein, the amount of allocating into of reduction coal is dry slag weight
20%, the amount of allocating into of slaked lime is the 18% of dry slag weight.
(3) mixture of cadmia, reduction coal and slaked lime step (2) obtained adds water and mixes and enter through former
Row pressure ball, measuring pelletizing fall strength of briquette is 12 times, can substantially meet rotary hearth furnace and enter stove requirement of strength.
(4) after molding, pelletizing is dried to moisture less than 4%, carries out reduction roasting in sending into direct-reduction rotary hearth furnace.In stove
Reduction temperature is 1330 DEG C, and the recovery time is 40min, obtains reduction agglomerate, and in this reduction agglomerate, the full ferrum in abrasive grit reaches
More than 98%, sulfur content 0.06%, iron recovery reaches more than 89%, and in reduction agglomerate, in pelletizing, Zn content is 0.44%, lead
Content is 0.23%, and silver content is 18g/t, and indium content is 66g/t.
Embodiment 3
The method utilizing the embodiment of the present invention carries out the direct-reduction of wet method zinc smelting dreg and processes, and specifically comprises the following steps that
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 16.34%, and lead content is 5.11%, and SiO2 content is
8～10%, silver content is 140g/t, and indium content is 320g/t, and iron content is 27%.Below 3mm it is crushed to after drying
(2) adding reduction coal and slaked lime in zinc leaching residue granule, wherein, the amount of allocating into of reduction coal is dry slag weight
20%, the amount of allocating into of slaked lime is the 15% of dry slag weight.
(3) mixture of cadmia, reduction coal and slaked lime step (2) obtained adds water and mixes and enter through former
Row pressure ball, measuring pelletizing fall strength of briquette is 12 times, can substantially meet rotary hearth furnace and enter stove requirement of strength.
(4) after molding, pelletizing is dried to moisture less than 4%, carries out reduction roasting in sending into direct-reduction rotary hearth furnace.In stove
Reduction temperature is 1350 DEG C, and the recovery time is 30min, obtains reduction agglomerate, and in this reduction agglomerate, in abrasive grit, full ferrum reaches 98%
Above, sulfur content is 0.05%, and iron recovery reaches more than 93%, and in reduction agglomerate, Zn content is 0.37%, and lead content is
0.43%, silver content is 15g/t, and indium content is 70g/t.
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
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
These embodiments can be carried out multiple change in the case of departing from the principle of the present invention and objective, revise, replace and modification, this
The scope of invention is limited by claim and equivalent thereof.
Claims (10)
1. the method for the direct-reduction of a wet method zinc smelting dreg, it is characterised in that including:
Dry zinc leaching residue is carried out mixed processing with coal and calcium based additives, in order to obtain mixture；
It is shaped described mixture processing, in order to obtain mixed material agglomerate；
Described mixed material agglomerate is carried out reduction roasting process, in order to obtain flue dust and the reduction group of argentiferous, lead, zinc and indium
Block；
Described reduction agglomerate carries out broken discharging process, in order to obtain iron content granulate mixture material；
Described iron content granulate mixture material is carried out sorting process, in order to obtain metallic iron product.
Method the most according to claim 1, it is characterised in that in described mixed processing, described coal and described dry zinc
The mass ratio of the dry slag of leached mud is (10-30): 100.
Method the most according to claim 1 and 2, it is characterised in that in described mixed processing, described calcium based additives and institute
State the mass ratio of dry slag of dry zinc leaching residue for (15-35): 100, it is preferable that for (20-35): 100.
4. according to the method described in any one of claim 1-3, it is characterised in that described calcium based additives selected from calcium hydroxide and
At least one of limestone.
5. according to the method described in any one of claim 1-4, it is characterised in that the particle diameter of described dry zinc leaching residue is little
In 3 millimeters,
Optionally, the granularity of described iron content granulate mixture material is not more than 2mm.
6. according to the method described in any one of claim 1-5, it is characterised in that the temperature that described reduction roasting processes is 1280
～1350 DEG C, the time is 15～30min.
7. according to the method described in any one of claim 1-6, it is characterised in that farther include:
The flue dust of described argentiferous, lead, zinc and indium is carried out dust removal process, in order to obtain dust and the purification of argentiferous, lead, zinc and indium
Flue gas.
8. implement a system for the method for the direct-reduction of wet method zinc smelting dreg described in any one of claim 1-7, its feature
It is, including:
Mixing device, described mixing device has dry zinc leaching residue entrance, coal entrance, calcium based additives entrance and mixture
Outlet；
Shaped device, described shaped device has mixture inlet and mixed material lump outlet, described mixture inlet and institute
State mixture outlet to be connected；
Reduction roasting device, described reduction roasting device have mixed material agglomerate entrance, reduction lump outlet and argentiferous, lead,
The flue dust outlet of zinc and indium, described mixed material agglomerate entrance is connected with described mixed material lump outlet；
Spiral discharging machine, described spiral discharging machine is arranged at reduction lump outlet, has reduction agglomerate entrance and broken material
Outlet, described reduction agglomerate entrance is connected with described reduction lump outlet；And
Separator, described in have and treat sorting material entrance, metallic iron products export and slag-drip opening, described in treat sorting material entrance with
The outlet of described broken material is connected.
System the most according to claim 8, it is characterised in that described reduction roasting device is rotary hearth furnace.
System the most according to claim 8 or claim 9, it is characterised in that farther include:
Dust arrester, described dust arrester has an exhanst gas outlet of flue dust entrance, dust outlet and purification, described flue dust entrance with
The described flue dust outlet of described reduction roasting device is connected.
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| CN107267753A (en) * | 2017-05-22 | 2017-10-20 | 中南大学 | A kind of additive and pelletizing process that pelletizing is reclaimed for iron vitriol slag |
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| CN107267753A (en) * | 2017-05-22 | 2017-10-20 | 中南大学 | A kind of additive and pelletizing process that pelletizing is reclaimed for iron vitriol slag |
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