CN107190159A - A kind of method that zinc-containing alloy is prepared containing Zn scrap returns - Google Patents
A kind of method that zinc-containing alloy is prepared containing Zn scrap returns Download PDFInfo
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- CN107190159A CN107190159A CN201710454936.5A CN201710454936A CN107190159A CN 107190159 A CN107190159 A CN 107190159A CN 201710454936 A CN201710454936 A CN 201710454936A CN 107190159 A CN107190159 A CN 107190159A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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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
- C22B1/02—Roasting 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
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
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Abstract
The present invention provides a kind of method that zinc-containing alloy is prepared containing Zn scrap returns.It is that raw material prepares zinc oxide that the method for preparing zinc-containing alloy containing Zn scrap returns that the present invention is provided, which is utilized containing Zn scrap returns, solves the problem of zinc recovering difficulty is big in waste material；Directly to produce kirsite containing Zn scrap returns, high pure zinc oxide just can be directly produced without purchasing oxide powder and zinc or zinc ingot metal, zinc-containing alloy manufacturing technique requirent is reached；Zinc oxide is prepared into zinc liquid again, without zinc ingot metal melting again is first made, but alloy raw material is directly added in zinc liquid zinc-containing alloy is made, save preparation technology, it is ensured that alloying component is more uniform, alloy mass is higher.Test result indicates that, the procedure that the present invention is provided is simple, the ZnAl prepared4Cu3Casting meets GB/T8738 2006 with kirsite composition and required.
Description
Technical field
It is more particularly to a kind of to prepare zinc-containing alloy containing Zn scrap returns the present invention relates to metal material utilization technology field
Method.
Background technology
Having many uses for zinc and kirsite, occupies critical role in national economy.Particularly in recent years, this metal exists
Application in terms of zinc-plated, alloy, casting, compound, zine plate, chemical industry, metallurgy, space flight, automobile and health is more drawn
People gazes at.Kirsite is the alloy that zinc is constituted with other alloying elements, occupies critical role in the application of zinc.Kirsite it is pure
Degree has large effect for alloy property, therefore, existing production kirsite technology be it is direct using high pure zinc oxide or
Zinc ingot metal is raw material, with the common melting of other alloying elements.
With the sustainable development of World Economics, global zinc consumption figure is dramatically increased, and the demand of kirsite increasingly increases,
And tellurian zn Mineral resource-constrained, it is simple to meet production requirement by traditional raw material.Also, high pure zinc oxide
Cost with zinc ingot metal is higher, and there is the problem of product purity is low when being reclaimed in the prior art containing Zn scrap returns, for preparing zinc-base
Alloy can cause alloy impurity content high, second-rate, it is impossible to meet use requirement.
The content of the invention
It is an object of the invention to provide a kind of method that zinc-containing alloy is prepared containing Zn scrap returns.The method that the present invention is provided without
Oxide powder and zinc or zinc ingot metal need to be purchased, directly to produce zinc-containing alloy as raw material containing Zn scrap returns, the zinc-containing alloy composition of preparation is equal
Even, quality is good.
The invention provides a kind of method that zinc-containing alloy is prepared containing Zn scrap returns, comprise the following steps：
(1) ball processed after Zn scrap returns are mixed with water will be contained, raw material wet bulb is obtained；
(2) the raw material wet bulb for obtaining the step (1) is calcined, and obtains raw material dry bulb；
(3) the raw material dry bulb for obtaining the step (2) is calcined, and obtains oxide powder and zinc；
(4) oxide powder and zinc for obtaining the step (3) obtains zinc oxide dry bulb with being dried after water ball；
(5) the zinc oxide dry bulb for obtaining the step (4) is condensed after reduction reaction is carried out under reducing agent effect, is obtained
Zinc liquid；
(6) melting after the zinc liquid for obtaining the step (5) is mixed with alloy raw material, obtains zinc-containing alloy.
It is preferred that, in the step (1) containing the Zn content in Zn scrap returns be more than 35%.
It is preferred that, the water content of raw material wet bulb is 20~25% in the step (1).
It is preferred that, the balling-up speed of ball processed is 0.06~0.94mmmin in the step (1)-1, the time of ball processed is 18
~23min.
It is preferred that, the temperature of roasting is 1100~1300 DEG C in the step (2), and the time of roasting is 30~60min.
It is preferred that, the roasting stated in step (2) is carried out under oxygen-enriched environment.
It is preferred that, the temperature of calcining is 1100~1300 DEG C in the step (3), and the time of calcining is 60~90min.
It is preferred that, the particle diameter of zinc oxide dry bulb is 5~10mm in the step (4).
It is preferred that, the reducing agent in the step (5) includes coal dust, CO, and CO and CO2Mixed gas in one
Kind.
It is preferred that, the temperature of reduction reaction is 1000~1300 DEG C in the step (5), time of reduction reaction for 60~
90min。
The invention provides a kind of method that zinc-containing alloy is prepared containing Zn scrap returns, comprise the following steps：To contain Zn scrap returns with
Ball processed after water mixing, obtains raw material wet bulb；The raw material wet bulb is calcined, raw material dry bulb is obtained；By the raw material dry bulb
Calcined, obtain oxide powder and zinc；It will be dried after the oxide powder and zinc and water ball, obtain zinc oxide dry bulb；By the oxidation
Zinc dry bulb is condensed after reduction reaction is carried out under reducing agent effect, obtains zinc liquid；Melted after the zinc liquid is mixed with alloy raw material
Refining, obtains zinc-containing alloy.The present invention solves zinc recovering difficulty in waste material using being that raw material prepares zinc oxide containing Zn scrap returns
Big the problem of；Directly to produce kirsite containing Zn scrap returns, just it can directly produce high-purity without purchasing oxide powder and zinc or zinc ingot metal
Zinc oxide is spent, zinc-containing alloy manufacturing technique requirent is reached；Zinc oxide is prepared into zinc liquid again, without zinc ingot metal melting again is first made,
But alloy raw material is directly added in zinc liquid zinc-containing alloy is made, save preparation technology, it is ensured that alloying component is more uniform,
Alloy mass is higher.Test result indicates that, the procedure that the present invention is provided is simple, the ZnAl prepared4Cu3Casting zinc
Alloying component meets GB/T8738-2006 requirements.
Embodiment
The invention provides a kind of method that zinc-containing alloy is prepared containing Zn scrap returns, comprise the following steps：
(1) ball processed after Zn scrap returns are mixed with water will be contained, raw material wet bulb is obtained；
(2) the raw material wet bulb for obtaining the step (1) is calcined, and obtains raw material dry bulb；
(3) the raw material dry bulb for obtaining the step (2) is calcined, and obtains oxide powder and zinc；
(4) oxide powder and zinc for obtaining the step (3) obtains zinc oxide dry bulb with being dried after water ball；
(5) the zinc oxide dry bulb for obtaining the step (4) is condensed after reduction reaction is carried out under reducing agent effect, is obtained
Zinc liquid；
(6) melting after the zinc liquid for obtaining the step (5) is mixed with alloy raw material, obtains zinc-containing alloy.
The present invention will contain ball processed after Zn scrap returns are mixed with water, obtain raw material wet bulb.In the present invention, it is described to contain in Zn scrap returns
Zn content be preferably more than 35%, more preferably 40~60%, most preferably 50~55%.The present invention contains Zn scrap returns to described
Species there is no special restriction, using it is well known to those skilled in the art contain Zn scrap returns.In the present invention, it is described to contain zinc
Waste material preferably includes the one or more in cadmia, zinc gray and gas mud, more preferably including one kind in cadmia and zinc gray with watt
The combination of this mud.In the present invention, a kind of and gas mud mass ratio in the cadmia and zinc gray is preferably (1.5~2):(1
~1.5), more preferably (1.6~1.8):(1.2~1.4), more preferably 1.5:1.
The present invention, without special restriction, contains zinc to the source containing Zn scrap returns using well known to those skilled in the art
Waste material.In the present invention, the gas mud is preferably the discarded object of blast furnace ironmaking in steel plant；The zinc gray and cadmia are excellent
Elect the byproduct that electrogalvanizing factory and electrolytic zinc plant are produced in process of production as.
The present invention does not have special restriction to the consumption of the water, aqueous according to needed for feed moisture content and raw material wet bulb
Amount is adjusted.In the present invention, the water content of the raw material wet bulb is preferably 20~25%, more preferably 22~
24%.
The present invention does not have special restriction to the device of the ball processed, using setting for ball processed well known to those skilled in the art
It is standby.In the present invention, the ball processed is carried out preferably in bastard feeder.In the present invention, the balling-up speed of the ball processed
Rate is preferably 0.06~0.94mmmin- 1, more preferably 0.1~0.8mmmin-1, most preferably 0.3~0.6mmmin-1；The time of the ball processed is preferably 18~23min, more preferably 19~21min.In the present invention, the raw material wet bulb is straight
Footpath is preferably 8~12mm, more preferably 9~11mm.In the present invention, the raw material, balling-up speed and ball time processed can make
Raw material wet bulb has higher intensity and burst temperature.
In the present invention, the compression strength of the raw material wet bulb is preferably not less than 1300N/, more preferably 1400~
1600N/, most preferably 1417N/；The burst temperature of the raw material wet bulb is preferably 200~220 DEG C, more preferably 205
~215 DEG C, most preferably 210 DEG C.In the present invention, the intensity and burst temperature of the raw material wet bulb are higher, then raw material wet bulb
Breakage rate during heating operation is lower, and the drying efficiency of wet bulb is higher, and raw material are heated more uniform, burst more uniform,
Help to be heated evenly during calcining, ensure the rate of recovery and purity of zinc.
Obtain after raw material wet bulb, the raw material wet bulb is calcined by the present invention, obtains raw material dry bulb.In the present invention,
The temperature of the roasting is preferably 1100~1300 DEG C, more preferably 1150~1250 DEG C；The time of the roasting is preferably 30
~60min, more preferably 40~50min.In the present invention, the roasting is carried out preferably under oxygen-enriched environment, the oxygen-enriched ring
The oxygen content in border is preferably 21~35%.In the present invention, the roasting makes raw material dry bulb have preferable cold strength, reduction
Property and granularity, are conducive to next step high-temperature calcination.
Preferably raw material wet bulb is dried before the roasting by the present invention.The present invention is to the operation of the drying without spy
Different restriction, using the technical scheme of drying well known to those skilled in the art.In the present invention, the temperature of the drying
Preferably 200~300 DEG C, more preferably 240~260 DEG C；The time of the drying is preferably 20~40min, and more preferably 25
~35min.
The device that the present invention is dried and is calcined to the raw material wet bulb does not have special restriction, using those skilled in the art
The device of well known drying and roasting.
In the present invention, the compression strength of the raw material dry bulb is preferably 24000-25000N/, more preferably 24400-
24600N/.It is more than 918N/ with compression strength in the prior art, dry bulb compression strength is more than 1916N/ and drop strength
Compared more than 6 times/, raw material wet bulb and raw material dry bulb prepared by the present invention has higher intensity and burst temperature.
Obtain after raw material dry bulb, the present invention is calcined the raw material dry bulb, obtains oxide powder and zinc.In the present invention,
The temperature of the calcining is preferably 1100~1300 DEG C, more preferably 1150~1250 DEG C；The time of the calcining is preferably 60
~90min, more preferably 70~80min.In the present invention, the temperature of the calcining discharge flue gas is preferably more than 400 DEG C, more
Preferably 500~600 DEG C.In the present invention, at a high temperature of the calcining, the zinc compound in raw material dry bulb is by band in raw material
Carbon reduction decomposition, formed zinc simple substance steam, into gas phase after be oxidized to form zinc oxide, as flue dust.
In the present invention, the calcining is carried out preferably in rotary furnace.In the present invention, the length of the rotary furnace is preferred
For 25~45m, more preferably 30~40m；The furnace interior of the rotary furnace is preferably steel inner panel；It is excellent inside the rotary furnace
Choosing carries blade agitators.
After the completion of calcining, the flue gas product that the present invention preferably obtains the calcining is separated, and obtains zinc oxide fumes,
Again oxide powder and zinc is obtained through collecting.In the present invention, the separation is preferably gravitational settling separation.In the present invention, described point
From the impurity in flue gas product can be removed, zinc oxide fumes is obtained.In the present invention, the impurity preferably include mineral matter,
Zn-ef ficiency and carbon that calcium compound and part are not reclaimed.
The present invention does not have special restriction to the device of the separation, is separated using flue gas well known to those skilled in the art
Device.In the present invention, the impurity preferably returns to mixing feeder by pipeline, and original is re-entered into by Water spray
In material, raw material wet bulb is formed.In the present invention, impurity preparing raw material wet bulb together with containing Zn scrap returns, realizes Zn-ef ficiency
Fully reclaim.
In the present invention, the zinc oxide fumes reaches sack cleaner by expansion chamber preferably by temperature difference pressure difference and carried out
Collect, obtain oxide powder and zinc；After remaining flue gas is separated through sack cleaner, qualified discharge is carried out by desulfurizing tower.In the present invention
In, the fineness of the oxide powder and zinc is preferably less than 45 μm, more preferably 10~40 μm；The specific surface area of the oxide powder and zinc is excellent
Elect 45m as2/ more than g, more preferably 50~100m2/g.In the present invention, the purity of the oxide powder and zinc be preferably 99.5% with
On, more preferably more than 99.8%.In the present invention, impurity is preferably also included in the oxide powder and zinc, the impurity is preferably wrapped
Include the one or more in calcified material, compound, the oxide of iron, cupric oxide, alkali metal oxide and silica.
In the present invention, the product of the calcining preferably also includes warm sludge.The present invention is preferably by the heat calcined and obtained
Slag carries out recovery indium processing.The present invention is operated without special restriction to recovery indium processing, using people in the art
The technical scheme of recovery indium known to member.In the present invention, the recovery indium is carried out preferably in kiln slag processing system.
Obtain after oxide powder and zinc, the present invention will be dried after the oxide powder and zinc and water ball, obtain zinc oxide dry bulb.This hair
It is bright by the oxide powder and zinc and water ball, obtain zinc oxide wet bulb.The present invention does not have special restriction to the quality of the water, with
It can reach that the moisture content of zinc oxide wet bulb is defined.In the present invention, the moisture content of the zinc oxide wet bulb be preferably 25~
35%, more preferably 28~32%.
The present invention is operated without special restriction to the drying, using the skill of drying well known to those skilled in the art
Art scheme.In the present invention, the temperature of the drying of the zinc oxide wet bulb is preferably 400~500 DEG C, more preferably 440
~460 DEG C；The time of the drying of the zinc oxide wet bulb is preferably 2~4h, more preferably 2.5~3.5h.In the present invention, institute
The particle diameter for stating zinc oxide dry bulb is preferably 5~10mm, more preferably 6~8mm.
The present invention does not have special restriction to the zinc oxide wet bulb ball and the device dried, using people in the art
Ball processed known to member and the device dried.In the present invention, the oxide powder and zinc is preferably passed through by automatic weighting hopper and counted
Fallen into after amount and feeding is carried out on belt conveyor, hopper above rotary dryer is delivered to through belt conveyor, carried out spray and add
Wet, the oxide powder and zinc wet feed after humidification, which enters rotary dryer, dried after ball processed.In the present invention, the oxide powder and zinc adds
Wet ball re-dry processed, is to form balling group, raw material is formed more preferable cold strength, reproducibility and granularity, after contributing to
Continuous step.
In the present invention, a small amount of dust can be produced in the feeding process, the present invention is preferably by above automatic gauge bucket
Gas skirt be collected after, the material collected by pulse bag type dust collector returns to rotary dryer and carries out shower humidification.At this
In invention, part zinc-containing dust dry particle is produced in the drying process, the dry particle preferably passes through bag filter
Rotary dryer is returned after being collected and carries out shower humidification.
Obtain after zinc oxide dry bulb, the present invention carries out the zinc oxide dry bulb cold after reduction reaction under reducing agent effect
It is solidifying, obtain zinc liquid.In the present invention, the reducing agent preferably includes coal dust and/or CO.In the present invention, with the oxygen in zinc oxide
With the gauge of the material of the carbon in reducing agent, the mol ratio of the carbon and oxygen is preferably 20~22:1, more preferably 20.5~
21.5:1, most preferably 21:1.
In the present invention, the temperature of the reduction reaction is preferably 1000~1300 DEG C, more preferably 1100~1200 DEG C；
The time of the reduction reaction is preferably 60~90min, more preferably 70~80min.
In the present invention, following chemical reaction is preferably included during the reduction reaction：
ZnO+C=Zn(gas)+CO
ZnO+CO=Zn(gas)+CO2
CO2+ C=2CO
2CuO+CO=Cu2O+CO2
Cu2O+CO=Cu+CO2
CuO+CO=Cu+CO2
3Fe2O3+ CO=2Fe3O4+CO2
Fe3O4+ CO=3FeO+CO2
FeO+C=Fe+CO
The present invention does not have special restriction to the device of the reduction reaction, using heating well known to those skilled in the art
Device.In the present invention, the reduction reaction is carried out preferably in resistance furnace.
In the present invention, the silica and alkali metal oxide in the impurity form silicic acid during reduction reaction
Salt slag is discharged.In the present invention, reduction reaction the accessory substance Fe and Cu are solid-state, are discharged together with silicate sludge.
After the completion of reduction reaction, the present invention is condensed the gaseous products of the reduction reaction, obtains zinc liquid.In this hair
In bright, the temperature of the condensation is preferably less than 907 DEG C, more preferably 800~900 DEG C；The pressure of the condensation is preferably
0Pa.The present invention does not have special restriction to the time of the condensation, is determined by zinc fume saturation capacity, zinc fume condenses into zinc liquid
Condensation terminates afterwards.In the present invention, the condensation rate of the condensation is preferably more than 98%.
The present invention does not have special restriction to the device of the condensation, using condensing plant well known to those skilled in the art
.In the present invention, the condensation is carried out preferably in splash condenser.Make certainly to avoid zinc liquid from absorbing zinc fume heat
Body temperature is constantly raised, and preferred pair liquid zinc of the present invention carries out indirect water-cooling, so as to ensure optimal condensation efficiency, reduces zinc gray life
Production, improves the direct recovery rate of zinc.In the present invention, the temperature of the zinc liquid is preferably 400~600 DEG C, more preferably 450~
550 DEG C, most preferably 480~520 DEG C.
In the present invention, zinc fume is condensed into zinc liquid in the condensation process, and part zinc fume is oxidized to form zinc gray.
The zinc gray is preferably mixed ball processed by the present invention as raw material with containing Zn scrap returns.To improve the utilization rate of zinc, the present invention preferably will
The condensed steam is washed.In the present invention, the number of times of the washing is preferably 3~5 times；The washing is preferably
Washing.In the present invention, the washing preferably includes following steps：By the condensed steam successively through two water seals and one-level
Water conservancy injector, carries out one-level washing；Then two grades of washings are carried out through three water seals and two grades of hydraulic ejectors successively；Again through four water
Envelope dehydration, carries out three-level washing.In the present invention, the one-level washing and two grades of washings make the zinc fume and zinc mist not being condensed
Further it is condensed into zinc liquid；The three-level washing can reclaim zinc to greatest extent, it is ensured that entrapped zinc as few as possible in condensing furnace
Molten drop.
In the present invention, the steam after the washing preferably includes CO, CO2, vapor and H2.In the present invention, it is described to wash
In steam after washing, the volume content of the CO is preferably more than 95%, and more preferably 95.7%.The present invention is preferably washed described
Steam after washing returns to reduction reaction step through pipeline and used as reducing agent, it is possible to decrease the consumption of part of coke reducing agent, reaches
To the purpose of energy-saving and emission-reduction.
The present invention is preferably settled the water after the washing, obtains blue powder；The main component of the blue powder is oxidation
Zinc.In the present invention, the blue powder is mixed preferably as raw material with containing Zn scrap returns.
Obtain after zinc liquid, melting after the present invention mixes the zinc liquid with alloy raw material obtains zinc-containing alloy.The present invention is right
The species of the alloy raw material does not have special restriction, is adjusted according to the composition of required zinc-containing alloy.In the present invention
In, when the zinc-containing alloy is copper alumin(i)um zinc alloy, the alloy raw material preferably includes metallic zinc, metallic copper and metallic aluminium.
The alloy raw material is preferably ground by the present invention before combination.The present invention is to the device of the grinding without spy
Different restriction, using lapping device well known to those skilled in the art.In the present invention, the grinding is preferably in Raymond mill
It is middle to carry out.In the present invention, the speed of the grinding is preferably 80~100r/min, more preferably 85~95r/min；It is described to grind
The time of mill is preferably 20~40min, more preferably 25~35min.In the present invention, after the grinding alloy raw material particle diameter
Preferably 0.13~0.40mm, more preferably 0.2~0.3mm.In the present invention, the process of lapping produces a small amount of suspended particulate
Thing.The particulate matter is preferably sent into after workshop sack cleaner is collected and returns to batch mixing containing Zn scrap returns by the present invention by pipeline
Process.
The present invention is operated without special restriction to the melting, using zinc-containing alloy well known to those skilled in the art
The technical scheme of melting.In the present invention, the temperature of the melting is preferably 460~500 DEG C, more preferably 470~490
℃.The present invention does not have special restriction to the time of the melting, can make raw material all fusings.The present invention is preferably in institute
State progress scum silica frost salvaging in fusion process.The flue gas that the present invention is produced during preferably the scum silica frost is salvaged is collected, with
Scum silica frost is used for the preparation of environmental protection brick after reclaiming together.
After the completion of melting, the product that the present invention preferably obtains the melting is cast, and obtains zinc-containing alloy.The present invention
To operating without special restriction for the casting, using the technical scheme of casting well known to those skilled in the art.
In order to further illustrate the present invention, zinc-containing alloy is prepared containing Zn scrap returns to what the present invention was provided with reference to embodiment
Method be described in detail, but they can not be interpreted as limiting the scope of the present invention.
Embodiment 1:
(1) ball processed after Zn scrap returns are mixed with water will be contained, raw material wet bulb is obtained.
It is 1.5 to include mass ratio containing Zn scrap returns:1 zinc gray and gas mud, zinc content is 35%；Mixed containing Zn scrap returns with water
Afterwards, the wet feed that water content is 20% is obtained；Wet feed is transported into bastard feeder by conveyer belt, rotated by roller by batch mixing system
Globulate；Balling ratio is 94.8%, and balling-up speed is 0.94mmmin- 1, balling-up size is 12mm, and the ball time processed is 23 minutes,
Wet bulb compression strength 1417N/, 210 DEG C of burst temperature.
(2) raw material wet bulb is calcined, obtains raw material dry bulb.
Raw material wet bulb is dried into 30min at 250 DEG C, 60min is then calcined at 1100 DEG C obtains raw material dry bulb；Dry bulb
Compression strength is 24199N/, and the wet bulb compression strength provided with existing technique is more than 918N/, and dry bulb compression strength is more than
The 1916N/ standards with drop strength more than 6 times/, These parameters can meet revolution furnace technology and greenball properties are wanted
Ask.
(3) raw material dry bulb is calcined, obtains oxide powder and zinc.
Raw material dry bulb is sent to rotary furnace by feeder and carries out high-temperature calcination volatilization, revolution furnace length is about 40 meters, temperature
Degree is at 1300 DEG C, and the temperature of discharge flue gas is 400 DEG C；Zinc in batch mixing volatilizees at high temperature to be reduced, into gas phase after weighed
New oxidation forms zinc oxide, enters dust treatment systematic collection；Warm sludge feeding kiln slag processing system carries out recovery indium processing.
Flue dust (is separated impurity) with zinc oxide separation by expansion chamber using gravitational settling, and impurity includes part mineral
Matter, calcium compound, some Zn-ef ficiency not reclaimed, carbon, mixing feeder is sent to by pipeline, is passed through again
Water spray is re-entered into batch mixing；The zinc oxide fumes separated reaches bag-type dust using temperature difference pressure difference by expansion chamber
Device, sack cleaner is again separate out part of smoke and carries out qualified discharge by desulfurizing tower, then by the oxide powder and zinc being collected into
Send into automatic weighting hopper.Oxide powder and zinc purity more than 99.5%, fineness (45 μm of testing sieves tail over rate) % ,≤0.1, compare surface
Product m2/ g >=45, compared with converter process of the prior art prepares purity zinc oxide for 45~60%, purity is higher.
(4) it will be dried after oxide powder and zinc and water ball, obtain zinc oxide dry bulb.
Oxide powder and zinc is sent into automatic weighting hopper with fork truck, is fallen into after metering on belt conveyor, defeated through belt
Send machine to be delivered to hopper above rotary dryer, rotary dryer is entered by charge pipe, the gradient of charge pipe is generally higher than thing
The angle of crater of material, enable material smoothly enter cylinder in, drier cylinder be one with horizontal line slightly into inclined rotation
Cylinder, material enters because the effect of gravity runs to relatively low one end from higher one end, and zinc oxide uses day in drier
Right gas burning is dried as thermal source, and dried material is sent out in discharge end by conveying worm, and drying temperature is general
Control is at 500 DEG C, and drying time completes about 3h since charging to discharging, and hot-air can take away partially dried dust when being vented
Grain, drying particle returns to rotary dryer and carries out shower humidification (humid control is after being collected by bag filter
35%), the oxide powder and zinc wet feed after humidification enters rotary dryer progress ball processed and dried, dry bulb particle diameter 10mm.
Produced in feeding process and gas skirt is provided with above a small amount of dust, automatic gauge bucket, by pulse after being collected through gas skirt
The material that sack cleaner is collected returns to rotary dryer and carries out shower humidification.
(5) condensed after zinc oxide dry bulb being carried out into reduction reaction under reducing agent effect, obtain zinc liquid.
Zinc oxide dry bulb is sent into resistance furnace through conveying worm, reducing agent coal dust, the mol ratio of material and reducing agent
Example is C/O=22, and wherein C is the C content in reducing agent, and O is the oxygen content in zinc oxide；Reduction temperature is 1300 DEG C, time
For 90min.
The main chemical reactions occurred in electric furnace are as follows：
ZnO+C=Zn (gas)+CO
ZnO+CO=Zn (gas)+CO2
CO2+ C=2CO
2CuO+CO=Cu2O+CO2
Cu2O+CO=Cu+CO2
CuO+CO=Cu+CO2
3Fe2O3+ CO=2Fe3O4+CO2
Fe3O4+ CO=3FeO+CO2
FeO+C=Fe+CO
In high temperature reduction fusion process, silica and alkali metal oxide (CaO, MgO etc.) formation silicate sludge melt
Slag is released by slag tap timing.
The zinc restored is entered with steam condition with furnace gas export of the furnace gas through furnace wall side and rake The Small Well to splash
Formula condenser, condensation temperature controls the fusing point in zinc, 907 DEG C, keeps condensation furnace pressure control in 0Pa, condensation time is by zinc
Vapo(u)rous amount determines that zinc fume, which condenses into after zinc liquid condensation, to be terminated, and condensation rate is up to 98%；" the zinc rain " kicked up by graphite rotator
Condensed absorbent imports zinc pond, zinc liquid own temperature is constantly raised because absorbing zinc fume heat, for control liquid zinc 400~
In the range of 600 DEG C, moveable U-shaped condensate pipe is provided with splash storage zinc groove to liquid zinc progress indirect water-cooling.
(main component of furnace gas is zinc fume, CO, CO to furnace gas after splash condenser is cooled down2), wherein big portion
The zinc fume divided has been condensed into zinc liquid, and a small amount of zinc fume is oxidized and forms zinc gray, periodically through taking off zinc gray from condenser
Mouth is clawed.Continue through a cold zinc fume not being condensed and condensed zinc mist as flue gas is through square chest, supervisor and tiltedly
Pipe enters two cold, two water seals and one-level water conservancy injector, by once washing, subsequently into three water seals and two grades of water-jets
Device, washed once again, is dehydrated through four water seals, and the resistance furnace furnace gas main component after three-level is washed is CO, CO2, water steam
Gas, H2Deng wherein CO gases account for 95.7%, are good reducing agents, and furnace gas returns to existing engineering rotary furnace as also through pipeline
Former agent is used, it is possible to decrease the consumption of part of coke reducing agent, reaches the purpose of energy-saving and emission-reduction.
Washings enter flashback tank, and blue powder sedimentation basin is flowed into through overflow pipe, through repeatedly sedimentation, and supernatant water is recycled, and is sunk
(zinc fume is often by other liquid dilutings, mainly CO or CO for the blue powder formed sediment in flashback tank2, when newly formed small drop
Surface is easily by CO2It is oxidized to zinc oxide, it is impossible to accumulate larger drop as zinc liquid, be finally solidified as fine powder and be called blue powder),
Pull out per hour 1~2 time, be put into in-car and be transported to stockyard and spontaneously dried.The blue powder in blue powder pond is deposited in, after after blowing out,
Artificial taking-up delivers to the stacking of raw material storehouse as raw material and is back to rotary kiln.
(6) melting after zinc liquid is mixed with alloy raw material, obtains zinc-containing alloy.
According to ZnAl4Cu3Raw material proportioning, weigh zinc ingot metal, copper ingot, aluminium ingot, classification be ground respectively through Raymond mill,
The material handled well is temporarily stored into raw material cabin, by fork truck each raw material is delivered into metering device, metering after be sent directly into electric furnace；Electricity
Zinc liquid prepared by resistance stove is introduced directly into electric furnace.Raymond mill process of lapping produces a small amount of particulate matter, and particulate matter is sent into by pipeline
Workshop sack cleaner returns to compounding process containing Zn scrap returns after being collected.
Furnace charge install after can power transmission fusing, temperature is at 500 DEG C；After current fluctuation is smaller, using peak power, until
It is melting down.With the fusing of furnace charge, the furnace charge not installed is loaded successively, untill furnace charge wholeization is complete, in fusion process
Material should be disclosed in time, prevents " to build bridge ", furnace charge starts after fusing, flux should be sprinkled in time, to prevent aluminium alloy from aoxidizing and inhale
Gas.
When aluminium alloy temperature reaches requirement, after aluminium alloy composition is qualified after testing, that is, has a power failure, skim, pour the conjunction of cast copper aluminium zinc
Gold.Aluminium alloy enters through closed chute in the mould of casting machine, after after the liquid cooling in mould to solid, is sprayed using recirculated water
Mold bottom is drenched, cools to 150 DEG C and casts ZINC ALLOY.Casting cycle is completed in closing pumped vacuum systems, is being poured
During do not have flue gas produce it is excessive.ZINC ALLOY is packed after natural cooling, weigh stock.
Opening electric furnace is dragged for during scum silica frost, can produce partial fume G1-4, and the flue gas of generation sets 5 sets, warp altogether through gas skirt
The flue dust produced in smelting process is delivered to sack cleaner and carries out dedusting by piping, and also a small amount of scum silica frost is sent to ring in addition
Protect brick preparation system.
To ZnAl manufactured in the present embodiment4Cu3Alloy carries out composition detection, as a result as follows：
| Element | Al | Cu | Mg | Zn | Fe | Pb | Cd | Sn |
| Content/% | 3.9 | 0.7 | 0.03 | Surplus | 0.035 | 0.004 | 0.003 | 0.0015 |
Test result indicates that, ZnAl manufactured in the present embodiment4Cu3Alloying component is uniform, meets《Casting ZINC ALLOY》
(GB/T8738-2006) standard.
The strength of alloy of preparation is 320MPa, and elongation is 2%, and impact flexibility is 95J.
Embodiment 2:
Using the identical method of embodiment 1, unlike：The zinc content in Zn scrap returns that contains in step (1) is 50%, raw material
The water content of wet bulb is 25%；Calcining is 1300 DEG C of calcining 30min in step (2)；Reduction temperature is 1100 DEG C in step (3).
To ZnAl manufactured in the present embodiment4Cu3Alloy carries out composition detection, as a result as follows：
| Element | Al | Cu | Mg | Zn | Fe | Pb | Cd | Sn |
| Content/% | 4.3 | 1.1 | 0.06 | Surplus | 0.035 | 0.004 | 0.003 | 0.0015 |
Test result indicates that, ZnAl manufactured in the present embodiment4Cu3Alloying component is uniform, meets《Casting ZINC ALLOY》
(GB/T8738-2006) standard.
The strength of alloy of preparation is 350MPa, and elongation is 4%, and impact flexibility is 100J.
Embodiment 3:
Using the identical method of embodiment 1, unlike：The zinc content in Zn scrap returns that contains in step (1) is 40%, raw material
The water content of wet bulb is 23%；Calcining is 1200 DEG C of calcining 40min in step (2)；Reduction temperature is 1200 DEG C in step (3).
To ZnAl manufactured in the present embodiment4Cu3Alloy carries out composition detection, as a result as follows：
| Element | Al | Cu | Mg | Zn | Fe | Pb | Cd | Sn |
| Content/% | 4.1 | 1.0 | 0.04 | Surplus | 0.035 | 0.004 | 0.003 | 0.0015 |
Test result indicates that, ZnAl manufactured in the present embodiment4Cu3Alloying component is uniform, meets《Casting ZINC ALLOY》
(GB/T8738-2006) standard.
The strength of alloy of preparation is 348MPa, and elongation is 3.8%, and impact flexibility is 97J.
Embodiment 4:
Using the identical method of embodiment 1, unlike：The zinc content in Zn scrap returns that contains in step (1) is 45%, raw material
The water content of wet bulb is 25%；Calcining is 1150 DEG C of calcining 50min in step (2)；Reduction temperature is 1250 DEG C in step (3).
To ZnAl manufactured in the present embodiment4Cu3Alloy carries out composition detection, as a result as follows：
| Element | Al | Cu | Mg | Zn | Fe | Pb | Cd | Sn |
| Content/% | 4.0 | 0.9 | 0.05 | Surplus | 0.035 | 0.004 | 0.003 | 0.0015 |
Test result indicates that, ZnAl manufactured in the present embodiment4Cu3Alloying component is uniform, meets《Casting ZINC ALLOY》
(GB/T8738-2006) standard.
The strength of alloy of preparation is 356MPa, and elongation is 4.2%, and impact flexibility is 101J.
Embodiment 5:
Using the identical method of embodiment 1, unlike：The zinc content in Zn scrap returns that contains in step (1) is 55%, raw material
The water content of wet bulb is 25%；Calcining is 1250 DEG C of calcining 45min in step (2)；Reduction temperature is 1150 DEG C in step (3).
To ZnAl manufactured in the present embodiment4Cu3Alloy carries out composition detection, as a result as follows：
| Element | Al | Cu | Mg | Zn | Fe | Pb | Cd | Sn |
| Content/% | 4.2 | 0.8 | 0.05 | Surplus | 0.035 | 0.004 | 0.003 | 0.0015 |
Test result indicates that, ZnAl manufactured in the present embodiment4Cu3Alloying component is uniform, meets《Casting ZINC ALLOY》
(GB/T8738-2006) standard.
The strength of alloy of preparation is 363MPa, and elongation is 4.4%, and impact flexibility is 105J.
As can be seen from the above embodiments, the procedure that the present invention is provided is simple, and the kirsite composition prepared is equal
It is even.
Described above is only the preferred embodiment of the present invention, not makees any formal limitation to the present invention.Should
Point out, for those skilled in the art, under the premise without departing from the principles of the invention, if can also make
Dry improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of method that zinc-containing alloy is prepared containing Zn scrap returns, comprises the following steps：
(1) ball processed after Zn scrap returns are mixed with water will be contained, raw material wet bulb is obtained；
(2) the raw material wet bulb for obtaining the step (1) is calcined, and obtains raw material dry bulb；
(3) the raw material dry bulb for obtaining the step (2) is calcined, and obtains oxide powder and zinc；
(4) oxide powder and zinc for obtaining the step (3) obtains zinc oxide dry bulb with being dried after water ball；
(5) the zinc oxide dry bulb for obtaining the step (4) is condensed after reduction reaction is carried out under reducing agent effect, obtains zinc
Liquid；
(6) melting after the zinc liquid for obtaining the step (5) is mixed with alloy raw material, obtains zinc-containing alloy.
2. according to the method described in claim 1, it is characterised in that be containing the Zn content in Zn scrap returns in the step (1)
More than 35%.
3. according to the method described in claim 1, it is characterised in that in the step (1) water content of raw material wet bulb be 20~
25%.
4. the method according to claims 1 to 3 any one, it is characterised in that the balling-up speed of ball processed in the step (1)
Rate is 0.06~0.94mmmin-1, the time of ball processed is 18~23min.
5. according to the method described in claim 1, it is characterised in that the temperature of roasting is 1100~1300 in the step (2)
DEG C, the time of roasting is 30~60min.
6. method according to claim 1 or 5, it is characterised in that the roasting in the step (2) is entered under oxygen-enriched environment
OK.
7. according to the method described in claim 1, it is characterised in that the temperature of calcining is 1100~1300 in the step (3)
DEG C, the time of calcining is 60~90min.
8. according to the method described in claim 1, it is characterised in that in the step (4) particle diameter of zinc oxide dry bulb be 5~
10mm。
9. according to the method described in claim 1, it is characterised in that the reducing agent in the step (5) includes coal dust, CO, with
And CO and CO2Mixed gas in one kind.
10. the method according to claim 1 or 9, it is characterised in that the temperature of reduction reaction is in the step (5)
1000~1300 DEG C, the time of reduction reaction is 60~90min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937730A (en) * | 2017-12-29 | 2018-04-20 | 永仁共创锌业有限公司 | Industrial total system containing Zn scrap returns |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181663A (en) * | 2011-04-27 | 2011-09-14 | 葫芦岛锌业股份有限公司 | Method for producing zinc powder by treating zinc-containing miscellaneous material through electric furnace |
| CN105692684A (en) * | 2016-03-17 | 2016-06-22 | 安徽颖达锌业发展有限公司 | High-purity zinc oxide production technology |
| CN106086400A (en) * | 2016-08-01 | 2016-11-09 | 江苏省冶金设计院有限公司 | Process the method and system of lead Zn scrap returns |
-
2017
- 2017-06-16 CN CN201710454936.5A patent/CN107190159B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181663A (en) * | 2011-04-27 | 2011-09-14 | 葫芦岛锌业股份有限公司 | Method for producing zinc powder by treating zinc-containing miscellaneous material through electric furnace |
| CN105692684A (en) * | 2016-03-17 | 2016-06-22 | 安徽颖达锌业发展有限公司 | High-purity zinc oxide production technology |
| CN106086400A (en) * | 2016-08-01 | 2016-11-09 | 江苏省冶金设计院有限公司 | Process the method and system of lead Zn scrap returns |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937730A (en) * | 2017-12-29 | 2018-04-20 | 永仁共创锌业有限公司 | Industrial total system containing Zn scrap returns |
| CN107937730B (en) * | 2017-12-29 | 2023-06-09 | 永仁共创锌业有限公司 | Industrial zinc-containing waste material comprehensive treatment system |
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