CN107523691B - A method of extracting valuable metal from industrial produced wastes - Google Patents
A method of extracting valuable metal from industrial produced wastes Download PDFInfo
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- CN107523691B CN107523691B CN201710621704.4A CN201710621704A CN107523691B CN 107523691 B CN107523691 B CN 107523691B CN 201710621704 A CN201710621704 A CN 201710621704A CN 107523691 B CN107523691 B CN 107523691B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The method that the invention discloses a kind of to extract valuable metal from industrial produced wastes, belongs to metal recovery technical field.This method is the following steps are included: 1) waste pretreatment stage；2) waste water rinses, for removing water soluble ingredient；3) the agglomerate fabrication stage；4) preparation reduction phase, mainly recycles zinc oxide；5) melting and reducing stage, the valuable metals ingredients such as recycling iron, nickel, chromium, manganese, molybdenum.The present invention has effectively achieved extracts valuable metal from waste, valuable metal is refined in the waste especially generated in stainless steel smelting and stainless steel process, the present invention not only improves the operational security of preparation reduction furnace and the purity of zinc oxide, and keeping the operation of the fusion reducing furnace of next step also safer, the valuable metals such as iron, nickel, manganese, molybdenum are efficiently recovered with the raw Iron activiation of special steel.
Description
Technical field
The invention belongs to metal recovery technical fields, are related to a kind of side that valuable metal is extracted from industrial produced wastes
Method.
Background technique
The enterprises such as chemical plant, zinc-plated factory, automobile factory can generate a large amount of waste in industrial processes.Especially steel
Iron enterprise, discovery has various wastes, such as dust, mill scale, iron filings, after pickling during stainless steel electric furnace smelting
Neutralize sludge, CCIM sludge etc.；There are also the machined burrs generated in stainless steel process, cutting burr etc. simultaneously.It is only stainless
Just there is the generation of few hundred thousand tonnes of waste in the industrial processes of steel enterprise every year.
Often containing the metal component that can be recycled in these wastes.Such as it is produced in stainless steel smelting process
Raw discarded species often contain the low temperature volatiles ingredients such as zinc (Zn), lead (Pb), cadmium (Cd), sodium (Na), potassium (K), chlorine (Cl),
And the non-volatile mineralogical composition such as calcium (Ca), aluminium (Al), silicon (Si), magnesium (Mg)；In addition there are also a small amount of heavy metal elements
With virose dioxin.It is emphasized that the lead (Pb) and cadmium (Cd) in volatile matter are the heavy metal members being harmful to the human body
Element, they are handled as waste is specified, and treatment process is legally by stringent management.Also some works
Iron (Fe), chromium (Cr), nickel (Ni), manganese (Mn), molybdenum (Mo) for containing in industry waste etc. are all highly useful in the industrial production
Metal component.Make full use of and prevent harmful element from polluting natural environment for resource, it is not only economically upper to consider
Recycle these valuable elements, it should technically take the method for safety and environmental protection.In order to realize these, in advanced industrial state
Family, for effective recycling of waste material in industrial processes, has been realized in many technical researches, and has more
Advanced technology is also during research and development and motion.
In advanced industrial country, for the recycling and reuse of waste material in industrial production, do a large amount of
Technical research, such as Japanese Laid-Open the 2009-079303rd and 2004-076152 patent.Existing metal recovery skill
Art is mixing comminuted steel shot dirt and carbonic acid reducing agent to manufacture into pelletizing, then puts it into reduction furnace and heated, and is made in agglomerate
Zinc ingredient is evaporate into exhaust gas, then dust, trapping dust are concentrated zinc ingredient and separate and recover in dust arrester by exhaust gas；
Remaining residue, metallic iron, building stones ingredient and residual heavy metal etc. catch time carried out again with container under the state of cooling
It receives and utilizes.
The processing temperature of reduction furnace is 1100~1250 DEG C in the prior art, and the exhaust gas generated at these temperatures contains
A large amount of low temperature volatile ingredient.Usually, the low temperature volatile ingredient 50% or so in the raw material of loading is restored in preparation
It volatilizees in furnace and is discharged together with exhaust gas.Exhaust gas constituents form subtle oxidation dust during temperature reduces, by
In being mixed into together with exhaust gas, from the dust filter tip of precipitron although recuperable zinc oxide, but zinc component content is very low, produces
The raw poor quality for causing zinc oxide product, while can also cause prepared reduction furnace operation unstable.Other 50% or so it is low
Warm volatile materials remains in the reduced iron being discharged from preparation reduction furnace and other coal ore ingredients (hereinafter referred to as at non-volatile
For special treatment steel preparation reduced iron) in, the normal heating operation of later period fusion reducing furnace is hindered, security risk is caused.Therefore,
The prior art is there is the valuable metal purity of recycling is lower, and process equipment the problems such as there is security risks.
Summary of the invention
In view of this, the purpose of the present invention is to provide one kind, and process equipment safety both can be improved, can also improve
The valuable metal purity of recycling, recycle the waste to greatest extent in metal component method.
In order to achieve the above objectives, the invention provides the following technical scheme:
A method of extracting valuable metal, including following process flow from industrial produced wastes:
1) pretreatment stage optionally pre-processes industrial produced wastes；It is first if waste is waste gas state
First handled with dust arrester；Dehydration and drying processing is carried out first if waste is sludge-like；If waste is large grained
Or bulk then carries out pulverization process first；
2) water rinses wash above-mentioned pretreated waste, to remove water soluble ingredient, then carry out again
Dehydration and drying；
3) agglomerate fabrication stage, waste and reducing agent, clinker regulator and base-material after dehydration and drying carry out abundant
It is stirred to form agglomerate and drying；
4) preparation reduction phase roasts agglomerate in preparation reduction furnace with 1000~1580 DEG C of temperature, and right
Its gas with volatile metal component generated is handled with dust arrester, recovery section valuable metal；
5) the melting and reducing stage, the residue after preparation reduction adds reducing agent again, clinker regulator is placed to melting also
In former furnace, and preheated air is supplied in fusion reducing furnace, the temperature of preheated air is 150~200 DEG C, while with 1600 DEG C with
Upper temperature is heated, and valuable metal ingredient therein is restored, and carries out cooling back receipts；And by the clinker in fusion reducing furnace
Carry out cooling recycling.
Further, the valuable metal of preparation reduction furnace firing stage recycling is mainly zinc oxide, fusion reducing furnace roasting
The stage valuable metal of recycling includes but is not limited in the oxide of zinc, lead, tin, germanium, antimony, copper, iron, copper, nickel, chromium, manganese, molybdenum
It is one or more.
Further, the manufacture of the agglomerate is according to 100 parts of waste；10~20 parts of reducing agent；Clinker regulator 10~
20 parts；10~20 parts of base-material are mixed.
Further, the average particle size of the agglomerate is 1~25mm, and bulk density is 1.5~3g/cm3, moisture content is
6~14wt%, dry compressive strength are 6~30kg/cm3。
Further, reducing agent is additionally added again in preparation reduction furnace, every 100 parts of agglomerates add 10~20 parts of reduction
Agent.
Further, agglomerate is according to circumstances additionally added in melting and reducing heater stage, the remnants after every 100 parts of preparations reduction
Object adds 10~50 parts of agglomerate.
Further, moisture content is controlled in 8~14wt% in the waste in step 2) after dehydration and drying.
Further, the clinker regulator is the mixture of lime stone, quick lime or the two, and basicity will reach 1
~3, average particle size is 0.3~1mm.
Further, the base-material is water and bentonitic mixture, and moisture content control is in 8~14wt%.
Further, the reducing agent is carbonic acid system reducing agent, one such using coke, smokeless char, graphite, coal
Or a variety of mixtures, and average particle size is 0.3~1mm.
The beneficial effects of the present invention are: the present invention has effectively achieved and extracts valuable metal from waste, especially
Valuable metal is refined in the waste generated in stainless steel smelting and stainless steel process, the present invention not only improves preparation also
The operational security of former furnace and the purity of zinc oxide, and keep the operation of the fusion reducing furnace of next step also safer, tin,
The valuable metals such as germanium, antimony, copper, iron, nickel, manganese, molybdenum are efficiently recovered with the raw Iron activiation of special steel.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is process equipment connection figure of the invention.
Specific embodiment
Below with reference to attached drawing, a preferred embodiment of the present invention will be described in detail；It should be appreciated that preferred embodiment
Only for illustrating the present invention, rather than limiting the scope of protection of the present invention.
Fig. 1 is flow chart of the method for the present invention, and present invention is mainly used for the wastes generated during stainless steel smelting
And valuable metal is extracted in the waste generated in stainless steel process, mainly include following below scheme:
1) pretreatment stage optionally pre-processes industrial produced wastes；It is first if waste is waste gas state
First handled with dust arrester；Dehydration and drying processing is carried out first if waste is sludge-like；If waste is large grained
Or bulk then carries out pulverization process first；
2) water rinses wash above-mentioned pretreated waste, to remove water soluble ingredient, then carry out again
Dehydration and drying；
3) agglomerate fabrication stage, waste and reducing agent, clinker regulator and base-material after dehydration and drying carry out abundant
It is stirred to form agglomerate and drying；
4) preparation reduction phase roasts agglomerate in preparation reduction furnace with 1000~1580 DEG C of temperature, and right
Its gas with volatile metal component generated is handled with dust arrester, recovery section valuable metal；
5) the melting and reducing stage, the residue after preparation reduction adds reducing agent again, clinker regulator is placed to melting also
In former furnace, and preheated air is supplied in fusion reducing furnace, the temperature of preheated air is 150~200 DEG C, while with 1600 DEG C with
Upper temperature is heated, and valuable metal ingredient therein is restored, and carries out cooling back receipts；And by the clinker in fusion reducing furnace
Carry out cooling recycling.
It may be noted that the waste materials that this technology is directed to are common industrial wastes in this patent, steel plant are contained
Electric furnace smelting dust, chemical plant, machinery plant, automobile factory, dig up mine Lian Kuang factory；Raw material form includes block iron filings, slag, dust,
Tail gas, all raw material sources containing valuable metal waste discharge.For stainless steel smelting and processing industry, discard
The possible exhaust gas of object, dust, burr, iron filings, sludge etc., will carry out different pretreatments for the waste of different conditions, if useless
Gurry is the exhaust gas that electric furnace generates, then first has to be handled in dust arrester；It is carried out first if waste is sludge-like
Dehydration and drying processing；Pulverization process is carried out first if waste is large grained or bulk.Pretreated waste carries out
Washing, and dehydrate.The stage of agglomerate is manufactured later.By 100 parts of waste and 15 parts of lime stone, coke powder 12
Part, 15 parts of base-material, tiny particle shape is made as agglomerate form by adequately mixing.At this moment the agglomerate manufactured has 10~
The average particle size of 20mm, 2~3g/cm3Bulk density, the moisture content of 6~8wt% range, there are also 20~30kg/cm3Drying
Compressive strength.
Above-mentioned agglomerate is packed into preparation reduction furnace, in 1050 DEG C or more of dimensional extent reduction roasting.What is generated at this time is useless
Gas is trapped by dust arrester, and zinc ingredient can be recovered with the state of crude zinc.After above-mentioned crude zinc separation, remaining residue is with special place
The form of reason steel preparation reduced iron (softening start temperature: 1280 DEG C or more) enters in fusion reducing furnace.In fusion reducing furnace
In can also be added the one or more waste of iron content, nickel, chromium, manganese, molybdenum element, such as steel scrap bits etc., to guarantee in finished product
Metal component meet the requirements.Specifically, 80 parts of special treatment steel preparation reduced iron in fusion reducing furnace, steel processing are discarded
20 parts of object, 10 parts of lime stone, the ratio mixing that 20 parts of coke, the inside upper layer of fusion reducing furnace supplies 180 DEG C or so on one side
Preheated air is heated on one side with 1600 DEG C or more of temperature.Final recycling includes tin, germanium, antimony, copper, iron, nickel, chromium, manganese, molybdenum
The melting and reducing pig iron and molten slag of equal elements.
Fig. 2 is process equipment connection figure of the invention, and waste materials point situation is packed into different funnels, including electric furnace
Dust funnel 1, sludge funnel 2, smashed waste funnel 3 are not limited to these three funnels herein, also and mean necessary same
When use these three funnels.Waste is encased in cleaning equipment 4 by above-mentioned funnel and is washed, washing time is general
It is 10 minutes.Waste after washing eliminate containing receive (Na), calcium (K), chlorine (Cl) etc. and identical water soluble ingredient are gone
In addition to Cl ingredient and alkaline components, accordingly, the impurity concentration in subsequent agglomerate is reduced, and dust is refined from agglomerate reduction roasting work
The exhaust gas generated in skill, the impurity concentration in obtained zinc oxide reduce, and can recycle the higher zinc oxide of Zn content.In addition,
Due to joined washing process, increases the softening start temperature of prepared reduced iron, prevent the preparation in preparation reduction furnace discharge
The cohesion of reduced iron greatly improves the safety of operation.
Because moisture content increases in the waste after above-mentioned washing, the worry that preparation reduction furnace thermal efficiency can be made low,
Dewaterer 4, drying machine 6 can be passed through in order to remove the moisture of chalk dust removing for the special steel treatment furnace electric furnace dust after washing
It is dehydrated；Waste moisture content after dehydration and drying is controlled in 8~14wt%.
For the waste liquid and dewatered filtered fluid after washing, wherein contain receive (Na), the ingredients such as potassium (K), chlorine (Cl),
It also, can be from being reused after final process in final liquid waste treating apparatus comprising a small amount of water-soluble heavy metal component.
It in next step, is made by the waste and carbonic acid system reducing agent after above-mentioned washing process, regulator and base-material mixing
Make the stage of agglomerate.
Specifically, the waste after washing is entered in mixing machine 10, at the same also by carbonic acid system reducing agent funnel 7,
Clinker regulator funnel 8, base-material funnel 9 add carbonic acid system reducing agent, filter residue regulator, base-material respectively, together by above-mentioned substance
It enters in agglomerate machine 11 and is manufactured into agglomerate after mixing.
As above-mentioned carbonic acid system reducing agent, it can be added coke, smokeless carbon, graphite, coal etc. can be used alone these
Middle one kind or two or more mixtures.For every 100 parts of wastes, the carbonic acid system reduction of 15~25 numbers can be used
Agent.The all not special restriction of shapes and sizes for carbonic acid system reducing agent, from average particle size in 0.5mm carbonic acid system below
Reducing agent can optimize the reduction of valuable metal element.Lime stone or quick lime etc. can be added in clinker regulator, can
One of they or two or more mixtures is used alone.Clinker regulator can when considering uniform mixing
Carbonic acid system reducing agent has unified particle size to be, the specific can be that, average particle size is below in 0.5mm.Above-mentioned furnace
Slag reducing agent is stored in clinker regulator funnel 8, then according to the content of waste, adjustment content discharge mixing appropriate.
Produce special treatment steel technical process in dust, sludge as waste materials after washing and drying is handled with furnace
Slag regulator, carbonic acid system reducing agent, base-material are equably mixed according to the amount discharge of setting by mixing arrangement.Above-mentioned mixing work
If skill mixture direct plunges into the case where hermetic type reduction furnace like this, powder dust particle can disperse, and interfere going back for oxidized metal
It is former.In addition, the powder dust particle of dispersion can make the quality of dust storage chamber zinc oxide low.Therefore, mixture can be used agglomerate machine by its
Be made as agglomerate form, at the same agglomerate moisture content it is higher when can also increase drying process and contained with adjusting moisture appropriate
Amount.
According to above-mentioned technique, the granularity that agglomerate there can be 5~20mm, the average grain of preferable 10~15mm range are manufactured
Degree, 1.5~3g/cm3Bulk density and 6~14wt% moisture content.Also, above-mentioned agglomerate can have 5~30kg/cm3Model
The drying compressive strength enclosed.Possess above-mentioned average particle size, bulk density, moisture content also mess up dry compressive strength when
It waits, the processing result of subsequent process can be fine, also, the sufficient intensity degree of porosity and moisture that reduction roasting technique requires, with
The variable volume stability of dry attribute is also fine.
It is the agglomerate that will be made in next step again, by preparation reduction furnace reduction roasting, zinc ingredient is as oxidation zinc recovering
Stage.
After agglomerate is packed into preparation reduction stove 12, implement heating with 1050~1250 DEG C of temperature.Above-mentioned preparation reduction
Furnace is rotary hearth furnace or rotary furnace.In this reduction roasting technique, zinc in agglomerate, lead, the elements such as chlorine can low temperature environment
Lower volatilization forms gaseous state flue dust.These flue dust are heated by the heat exchanger being arranged inside high-temp waste gas dust storage chamber 13, are added
The air of heat is supplied to prepared reduction furnace and is used by transfer pipeline 14.The above-mentioned exhaust gas through over-heat-exchanger, passes through dust arrester
By purification chimney 17 after 15 processing, arrange into atmosphere.At this moment, dust arrester 15 is added to clearing machine to purify exhaust gas, specifically
, built-in active carbon.
The dust that above-mentioned dust arrester 15 is collected is the zinc oxide that be high concentration.The high concentration zinc oxide of recycling stores funnel
After 16, later by general zinc extraction technique, metallic zinc can be recycled.
After crude zinc separation, there is metallic iron in remaining residue, ferriferous oxide, there are also comprising building stones by-product, referred to as
Special treatment steel preparation reduced iron.Due to front washing process, so that it is possessed higher softening start temperature, can specifically have
1280 DEG C or more of softening start temperature.
But because the reduction rate in the special treatment steel preparation reduced iron of preparation reduction furnace 12 is approximately less than 30%, with
This state, subsequent fusion reducing furnace 21 will consume a large amount of recovery time and energy.Therefore the setting of preparation reduction furnace 12 is made
To throw input port of the charcoal system as carbonic acid system reducing agent.It can be with additional input carbonic acid system reducing agent, in this way according to handling situations
One, the rate of recovery of zinc improves, and the reduction rate of preparation reduced iron can also reach 70% or more degree.Subsequent melt reduction furnace
21 operational security is also improved, and what above-mentioned carbonic acid system reducing agent and front were said is unified.
The preparation remaining substance of reduction furnace, i.e. special treatment steel preparation reduced iron are loaded into preparation by last stage
Reduced iron funnel 18 is simultaneously added in fusion reducing furnace, while being divided by carbonic acid system reduction funnel 19, clinker regulator funnel 20
It Tian Jia not carbonic acid system reducing agent and clinker regulator.In melting and reducing electric furnace, preheated air is supplied on one side, implements to use on one side
1580 DEG C or more of temperature heating.Meanwhile the tenor in order to guarantee finished product, special treatment steel processing waste can be made
For with the waste as the machining chips that are generated in the processing technology of stainless steel, or cutting scrub cream etc., with agglomerate shape
After state processing together with special treatment steel preparation reduced iron, it is fitted into fusion reducing furnace 21, implements melting and reducing.Above-mentioned new addition
Agglomerate waste can add the amount using 10~50 parts on the basis of every 100 parts of special treatment steels preparation reduced iron.
Carbonic acid system reducing agent and the clinker regulator of melting and reducing stage addition and front preparation reduction phase be as
's.When considering the rate of recovery of valuable metals such as Fe, Cr, Ni, Mn, Mo, based on 100 parts of waste total amount in fusion reducing furnace
Calculation, carbonic acid system reducing agent and clinker regulator respectively use 10~20 parts of amount.
Volatilized metal element reoxidizes in the high-temp waste gas generated in view of above-mentioned melting and reducing electric furnace 21, Ke Yitong
Preheated air feedway is crossed to supply.After reoxidizing processing, exhaust gas purifies in dust arrester 22, then passes through purification chimney 17
It is discharged, remaining metal oxidation is also recycled in storage funnel 16 in dust arrester 22.
As fusion reduction reaction as a result, there are also the useful metal ingredients of Mo etc. and special place containing Fe, Ni, Cr, Mn
Steel liquid pig iron is managed as molten slag by separating treatment.The special treatment steel liquid pig iron of recycling is from melting and reducing electric furnace stream
Clinker recovery room 23 is entered after out, and forms certain form in stainless steel pig iron main line machine, is cooled into special treatment steel
Ingot, the raw material that can be used as specially treated steel steel later use, or are filled according to the washing for being attached to melting and reducing electric furnace
Raw material or half volley ball after setting the spherical pig iron of special treatment steel to form spherical stainless steel ball, as stainless steel steel.
Clinker is after natural cooling, and being also used as return slag can use as stone material, or according to outside fusion reducing furnace 21
The clinker water washing device of the high pressured water sprayer of setting etc. sprays high pressure water, row at crush clinker as the raw material of cement or
It is used as the use of road flag.
The remaining valuable metal ingredient containing Fe, Ni, Cr, Mn, Mo etc. enters valuable metal recovery in fusion reducing furnace
Room 24.Since prior washing process eliminates water-soluble low temperature volatile ingredient, the operational security of reduction furnace and crude zinc at
Color greatly improves.In economic aspect, the various composition in waste is effectively separated, and feelings are regarded to isolated ingredient
Condition is effectively recycled, unusual energy conservation and environmental protection.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, it is clear that those skilled in the art
Various changes and modifications can be made to the invention by member without departing from the spirit and scope of the present invention.If in this way, of the invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these to these modifications and variations
Including modification and variation.
Claims (10)
1. a kind of method for extracting valuable metal from industrial produced wastes, which is characterized in that including following process flow:
1) pretreatment stage optionally pre-processes industrial produced wastes；It is used first if waste is waste gas state
Dust arrester is handled；Dehydration and drying processing is carried out first if waste is sludge-like；If waste is large grained or block
Shape then carries out pulverization process first；
2) above-mentioned pretreated waste is washed, to remove water soluble ingredient, is then dehydrated again by water rinses
It is dry；
3) agglomerate fabrication stage, waste and carbonic acid system reducing agent, clinker regulator and base-material after dehydration and drying are filled
Divide and is stirred to form agglomerate and drying；
4) agglomerate is roasted in preparation reduction furnace with 1000~1580 DEG C of temperature, and produced to it by preparation reduction phase
The raw gas with volatile metal component is handled with dust arrester, recovery section valuable metal；
5) the melting and reducing stage, the residue after preparation reduction adds carbonic acid system reducing agent again, clinker regulator is placed to melting
In reduction furnace, and preheated air is supplied in fusion reducing furnace, the temperature of preheated air is 150~200 DEG C, while with 1600 DEG C
Temperatures above is heated, and valuable metal ingredient therein is restored, and carries out cooling back receipts；And by the clinker in fusion reducing furnace
Also cooling recycling is carried out.
2. a kind of method for extracting valuable metal from industrial produced wastes according to claim 1, it is characterised in that:
The valuable metal of preparation reduction furnace firing stage recycling is mainly zinc oxide, the valuable metal of fusion reducing furnace firing stage recycling
Including zinc, lead, tin, germanium, antimony, copper, iron, nickel, chromium, manganese, one of the oxide of molybdenum or a variety of.
3. a kind of method for extracting valuable metal from industrial produced wastes according to claim 2, it is characterised in that:
The manufacture of the agglomerate is according to 100 parts of waste；10~20 parts of reducing agent；10~20 parts of clinker regulator；10~20 parts of base-material
It is mixed.
4. a kind of method for extracting valuable metal from industrial produced wastes according to claim 3, it is characterised in that:
The average particle size of the agglomerate is 1~25mm, and bulk density is 1.5~3g/cm3, moisture content is 6~14wt%, dry pressure
Contracting intensity is 6~30kg/cm3。
5. a kind of method for extracting valuable metal from industrial produced wastes according to claim 3, it is characterised in that:
Additionally add reducing agent again in preparation reduction furnace, every 100 parts of agglomerates add 10~20 parts of reducing agents.
6. a kind of method for extracting valuable metal from industrial produced wastes according to claim 5, it is characterised in that:
Agglomerate is according to circumstances additionally added in melting and reducing heater stage, the residue after every 100 parts of preparations reduction adds 10~50 parts
Agglomerate.
7. a kind of method for extracting valuable metal from industrial produced wastes according to claim 6, it is characterised in that:
Moisture content is controlled in 8~14wt% in waste in step 2) after dehydration and drying.
8. a kind of method for extracting valuable metal from industrial produced wastes according to claim 6, it is characterised in that:
The clinker regulator is the mixture of lime stone, quick lime or the two, and basicity will reach 1~3, average particle size 0.3
~1mm.
9. a kind of method for extracting valuable metal from industrial produced wastes according to claim 6, it is characterised in that:
The base-material is water and bentonitic mixture, and moisture content control is in 8~14wt%.
10. a kind of method for extracting valuable metal from industrial produced wastes according to claim 6, feature exist
In: the reducing agent is carbonic acid system reducing agent, using the one such or a variety of mixing of coke, smokeless char, graphite, coal
Object, and average particle size is 0.3~1mm.
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| CN114517261B (en) * | 2021-12-06 | 2023-04-25 | 生态环境部华南环境科学研究所 | Method and device for selectively extracting and recovering chromium element in electroplating sludge |
| CN114156460A (en) * | 2021-12-09 | 2022-03-08 | 泉州师范学院 | Method for preparing lithium battery transition metal oxide negative electrode material from industrial production waste |
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| US4701214A (en) * | 1986-04-30 | 1987-10-20 | Midrex International B.V. Rotterdam | Method of producing iron using rotary hearth and apparatus |
| CN103627835A (en) * | 2013-11-12 | 2014-03-12 | 金川集团股份有限公司 | Method for treating nickel smelting furnace slag |
| CN103757170A (en) * | 2013-12-13 | 2014-04-30 | 金川集团股份有限公司 | Method for injection reduction extraction of iron from nickel smelting furnace slag |
| CN103966421A (en) * | 2014-04-23 | 2014-08-06 | 邢台职业技术学院 | Comprehensive recovery method of ferrous metallurgical solid wastes |
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