CN110433956A - A method of recycling zinc, iron and/or carbon from blast furnace dust - Google Patents
A method of recycling zinc, iron and/or carbon from blast furnace dust Download PDFInfo
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- CN110433956A CN110433956A CN201910754389.1A CN201910754389A CN110433956A CN 110433956 A CN110433956 A CN 110433956A CN 201910754389 A CN201910754389 A CN 201910754389A CN 110433956 A CN110433956 A CN 110433956A
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- Prior art keywords
- iron
- carbon
- ore pulp
- zinc
- blast furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
- B03B5/52—Spiral classifiers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
-
- 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
- C22B7/005—Separation by a physical processing technique only, e.g. by mechanical breaking
-
- 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
- C22B7/02—Working-up flue dust
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The method that the present invention provides a kind of to recycle zinc, iron and/or carbon from blast furnace dust, it the described method comprises the following steps: blast furnace dust is modulated into ore pulp, carry out 0.025mm grade it is wet sieving, obtain granularity and be less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon material；Obtained iron content, carbon material are subjected to spiral separating, is dehydrated after the completion of sorting, obtains carbon products and iron product.The present invention is wet sieving by 0.025mm grades, blast furnace dust is divided into including zinc particles and iron content, carbon material, according to iron, the density contrast of carbon and iron content, the granularity feature of carbon material, spiral separating is selected to sort iron, carbon, to realize the separation and recovery to zinc, iron and/or carbon in blast furnace dust, Zn content in zinc-rich product is up to 6.01wt%, and the middle iron content of iron product is up to 50.45wt%, and the carbon content in carbon products is up to 51.14wt%.
Description
Technical field
The invention belongs to technical field of resource recovery, are related to a kind of method of Resource recovery from blast furnace dust, specifically
It is related to a kind of method that zinc, iron and/or carbon are recycled from blast furnace dust.
Background technique
Blast furnace dust refers to the subparticle group discharged during blast furnace steel-making with blast furnace gas, is incomplete by mineral
Burn formed fine solid particles, usually contain the metallic zinc of 5-15wt%, the metallic iron of 15-40wt%, 25-50% it is non-
The other elements of metal carbon and surplus.
Due to current technology limitation, blast furnace dust is inevitable solids in current blast furnace ironmaking process
One of object, at present there is also a large amount of blast furnace dust to be processed, to blast furnace dust it is effective recycle can alleviate zinc,
The resource pressure of iron reduces the harm of resource scarcity, additionally it is possible to reduce the stacking harm of blast furnace dust.
Currently, the recovery method of blast furnace gas recycling is broadly divided into beneficiation enrichment method, hydrometallurgical and high melt method.
107604110 A of CN discloses a kind of method that iron is selected from blast furnace dust, and this method leads to blast furnace dust
Enter air classification-wind magnetic separation system to be handled, separates bulky grain gas ash by air classification to obtain selection by winnowing iron
Concentrate；The magnetic material in fine granularity gas ash is separated by wind magnetic separation to obtain magnetic separation of iron ore concentrate, selection by winnowing iron ore concentrate
Sintering is directly returned to magnetic separation of iron ore concentrate, smelting procedure uses；It is zinc-rich mine by the secondary gas ash that bag filter traps
Powder, grain sorting of this method using the cooperation of air blower and ventilating duct length by granularity greatly, in quality are enriched with out, recycle
Metallic iron in magnetic method recovered material, this method do not introduce chemical agent, do not add water, can be realized efficient dry separation,
The rate of recovery of ferro element is up to 87% or more.
106011476 A of CN discloses a kind of technique for extracting scandium in gas ash, and gas ash containing scandium is leached with spent acid
After filter, filter acquired solution after reducing agent restores, neutralized with gas ash containing scandium, gained neutralization slag carried out often with spent acid
Pressure leaches, and leaches gained filtrate with extraction back extraction oxalic acid precipitation and obtains oxalic acid scandium.The technology utilization is by sulfuric acid, hydrochloric acid and nitric acid group
At mixing spent acid to gas ash containing scandium carry out acidleach, then to leachate carry out extraction and back extraction obtain scandium salts and indium salts,
To recycle rare metal, and electrowinning zinc can be recycled simultaneously, and the cost of spent acid is low, it is good in economic efficiency.
107686895 A of CN discloses a kind of metallurgical solid waste method of comprehensive utilization, and iron content carbon zinc fume mud is added this method
In the tapping process of high-temperature slag, carbon resource in dross sensible heat and dirt mud is made full use of, is sent out with iron, zinc in high-temperature slag and dirt mud
Raw reduction reaction realizes the synchronous recycling of the valuable resources such as iron, zinc in dirt mud and slag；After removing iron and zinc simultaneously, pass through control
Mix slag ingredient and the type of cooling, it can be achieved that remaining slag high value added utilization.This method using blast furnace cinder
Waste heat reaches the reaction temperature of carbon reduction, can be effectively reduced energy consumption.
The above method can alleviate blast furnace dust to the pressure of ecological environment, but also all there is need improved ask
Topic.
The raw material of wind magnetic separation is based on the close of metallic element zinc in blast furnace dust, iron, lead and nonmetalloid carbon
The Gravity separation enrichment that degree difference carries out.Although their density variation meets the necessary condition of Gravity separation, in practical application
In the process, the granularity of blast furnace dust is smaller, and metallic element particles and carbonaceous particles can not overcome the turbulent flow in air dielectric
It influences, product slot can only be entered at random with air stream, tramp content is caused to increase, deteriorate Gravity separation effect.
Various forms of wet-process metallurgy leachates are directly carried out to blast furnace dust there is the problem of carrying out is difficult to, and are passed through
The carbon content of blast furnace stove fire treated gas ash is higher, and surface often has extraordinary hydrophobicity, this results in leaching
Gas ash can only float on acid solution surface in journey, it is difficult to carry out acid-leaching reaction is sufficiently mixed, if by gas ash and high temperature furnace slag weight
New melting, zinc, lead and other elements in blast furnace dust then will become impurity element, influences the quality of steel products.Therefore, it is necessary to
It is proposed a kind of method for more reasonably handling blast furnace dust.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides one kind from blast furnace dust combined recovery zinc, iron and/
Or the method for carbon, the regularity of distribution of the present invention according to zinc, three kinds of iron, carbon elements in blast furnace dust, by specific physics
Separation method can respectively obtain the particle rich in three kinds of zinc, iron and carbon elements respectively, realize point of zinc, iron and/or carbon
From recycling.
To achieve this purpose, the present invention adopts the following technical scheme:
The method of the present invention provides a kind of from blast furnace dust combined recovery zinc, iron and/or carbon, the method includes
Following steps:
(1) blast furnace dust is modulated into the first ore pulp, 0.025mm grades of progress is wet sieving, obtains granularity and is less than
Iron content of the including zinc particles and granularity of 0.025mm in 0.025mm or more, carbon material；
(2) iron content that step (1) obtains, carbon material are modulated into the second ore pulp, carry out spiral separating processing, spiral separating
It is dehydrated after the completion, obtains carbon products and iron product.
The process that different elements form particle in blast furnace dust has differences, the zinc in blast furnace ironmaking process, in raw material
Element forms zinc fume by high temperature reduction, and the including zinc particles for aoxidizing and being condensed into granularity very little then occur with air, keeps zinc first
Element is enriched in small minitype particle of the granularity less than 0.025mm；Carbon in blast furnace dust, mainly in raw material not completely
The coke fragments or coal dust that burning is just discharged with gas ash, so the granularity of carbonaceous particles is bigger than normal, and the origin cause of formation of iron content particle compared with
For complexity, on the one hand it is the gasification, liquefaction of molten iron in ironmaking processes and the iron content particle that solidification generates, is on the other hand gas
It is entrained with the iron content bulky grain come during gas and carbon dust escape, content of the ferro element in different grain size is almost unchanged.
Therefore, the Zn-ef ficiency in blast furnace dust is enriched in particle of the granularity less than 0.025mm, and carbon is enriched in grain
For degree in the particle of 0.025mm or more, ferro element is unobvious in the content difference of each granularity level, and therefore, the present invention utilizes
0.025mm granularity is classified, available including zinc particles and iron content, carbon material.
Preferably, step (1) described blast furnace dust be modulated into the operation of the first ore pulp include: mixing blast furnace dust with
Water obtains the first ore pulp.
Preferably, the concentration of step (1) first ore pulp be 20-40wt%, such as can be 20wt%, 25wt%,
30wt%, 35wt% or 40wt%, preferably 25-35wt%.
Preferably, step (1) is described wet sieving carries out in high-frequency screen.
Preferably, step (1) the wet sieving operation includes: using Pulp pump by the first pulp conveying to high frequency
Sieve carries out wet sieving.
Preferably, also contain dispersing agent in first ore pulp.
Preferably, dispersing agent include in hydrolysis of polymaleic anhydride, calgon or waterglass any one or at least
Two kinds of combination, typical but non-limiting combination include the combination of hydrolysis of polymaleic anhydride and calgon, hexa metaphosphoric acid
The combination or hydrolysis of polymaleic anhydride of the combination of sodium and waterglass, hydrolysis of polymaleic anhydride and waterglass, calgon and water
The combination of glass.
Preferably, the concentration of the dispersing agent be 0.8-1.5wt%, such as can be 0.8wt%, 0.9wt%, 1wt%,
1.1wt%, 1.2wt%, 1.3wt%, 1.4wt% or 1.5wt%.
It preferably, include: mixing iron content, carbon object by the operation that iron content obtained by step (1), carbon material are modulated into the second ore pulp
Material and water, obtain the second ore pulp；
Preferably, the concentration of second ore pulp be 15-25wt%, such as can be 15wt%, 16wt%, 17wt%,
18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt% or 25wt%.
Preferably, the method includes being dehydrated to step (1) described including zinc particles, obtain zinc-rich product.
Preferably, gained water after including zinc particles dehydration, for modulating the first ore pulp and/or the second ore pulp.
Preferably, step (2) described screw sieving carries out in spiral.
Preferably, spiral of the present invention is using 8 circle helicla flutes, and 8 ° of outer rim inclination angles, flow velocity is 8r/min in slot.
Since the density of iron is 7.8g/cm3, the density of carbon is 1.8g/cm3, the gravity separation technology based on density variation makes
The good selection of iron and carbon particle is separated, but iron content, carbon particle granularity are small, conventional air dielectric selection by winnowing separating effect is bad.
The method that the present invention utilizes spiral separating strengthens iron content and carbonaceous particles by the stability of shallow-layer laminar flow water body
By the process of Density Separation, i.e., the slurry containing iron content, carbon material forms shallow-layer laminar flow in the spiral chute of spiral
Water body, by the centrifugal action that spiral channel generates, the big iron content particle of density sinks down into bed of material bottom and the sidesway to outside groove body
Dynamic, the small carbonaceous particles of density, which float on above the bed of material and rest in groove body, to be surveyed, finally inside and outside the discharge port of spiral
Side respectively obtains charcoal product and iron product.
Preferably, gained water is used to modulate the first ore pulp and/or the second ore pulp after step (2) described dehydration.
As the optimal technical scheme of the method for the invention, described method includes following steps:
(1) by blast furnace dust and water and dispersant, the first ore pulp that concentration is 20-40wt%, institute are modulated into
Stating the dispersant concentration in the first ore pulp is 0.8-1.5wt%, is carried out the first pulp conveying to high-frequency screen using Pulp pump
0.025mm grades wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon object
Material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 15-25wt% is modulated into, by the second ore pulp in spiral shell
Spiral separating is carried out in rotation sorting machine, is dehydrated after the completion, carbon products and iron product, including zinc particles obtained by step (1) are obtained
Zinc-rich product is obtained after dehydration, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Numberical range of the present invention not only includes enumerated point value, further includes the above-mentioned numerical value not included
Arbitrary point value between range, as space is limited and for concise consideration, range described in the present invention no longer exclusive list includes
Specific point value.
Compared with prior art, the invention has the benefit that
The present invention is wet sieving by 0.025mm grades, and blast furnace dust is divided into including zinc particles and iron content, carbon material,
Then according to iron, the density contrast of carbon and iron content, the granularity feature of carbon material, the method for spiral separating is selected to carry out iron, carbon
Sorting, to realize the separation and recovery to zinc, iron and/or carbon in blast furnace dust, the Zn content in zinc-rich product is up to
The middle iron content of 6.01wt%, iron product are up to 48.84wt%, and the carbon content in carbon products is up to 40.88wt%.Institute of the present invention
It is simple and easy to state method, Yi Jinhang industrialization promotion.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.
Embodiment 1
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and calgon, is modulated into the first ore pulp that concentration is 30wt%, institute
The concentration for stating the calgon in the first ore pulp is 1wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.025mm grades wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon object
Material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 20wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 6.01wt%, iron 24.19wt%, carbon 33.07wt%, chlorine 1.83wt%, surplus are other yuan
Element；
Iron product: zinc 0.95wt%；Iron 50.45wt%, carbon 19.12wt%, chlorine 0.93wt%, surplus are other elements；
Carbon products: zinc 1.81wt%；Iron 20.10wt%, carbon 51.14wt%, chlorine 0.75wt%, surplus are other elements.
Embodiment 2
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and calgon, is modulated into the first ore pulp that concentration is 25wt%, institute
The concentration for stating the calgon in the first ore pulp is 0.9wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.025mm grades wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon object
Material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 18wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 5.68wt%, iron 26.00wt%, carbon 34.18wt%, chlorine 1.90wt%, surplus are other yuan
Element；
Iron product: zinc 1.12wt%；Iron 48.63wt%, carbon 20.23wt%, chlorine 0.89wt%, surplus are other elements；
Carbon products: zinc 1.92wt%；Iron 20.52wt%, carbon 50.01wt%, chlorine 0.80wt%, surplus are other elements.
Embodiment 3
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and hydrolysis of polymaleic anhydride, is modulated into the first mine that concentration is 35wt%
It starches, the concentration of the hydrolysis of polymaleic anhydride in first ore pulp is 1.2wt%, using Pulp pump that the first pulp conveying is supreme
Frequency sieves, and 0.025mm grades of progress is wet sieving, obtains including zinc particles of the granularity less than 0.025mm and granularity 0.025mm's or more
Iron content, carbon material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 22wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 5.49wt%, iron 26.75wt%, carbon 33.87wt%, chlorine 1.88wt%, surplus is other yuan
Element；
Iron product: zinc 1.09wt%；Iron 47.98wt%, carbon 21.64wt%, chlorine 0.98wt%, surplus is other elements；
Carbon products: zinc 1.95wt%；Iron 20.06wt%, carbon 49.83wt%, chlorine 0.82wt%, surplus is other elements.
Embodiment 4
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and waterglass, is modulated into the first ore pulp that concentration is 20wt%, described the
The concentration of waterglass in one ore pulp is 0.8wt%, using Pulp pump by the first pulp conveying to high-frequency screen, carries out 0.025mm
Grade is wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 15wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 5.01wt%, iron 28.03wt%, carbon 34.67wt%, chlorine 1.95wt%, surplus are other yuan
Element；
Iron product: zinc 1.23wt%；Iron 45.39wt%, carbon 25.48wt%, chlorine 0.98wt%, surplus are other elements；
Carbon products: zinc 2.01wt%；Iron 21.17wt%, carbon 47.31wt%, chlorine 0.75wt%, surplus are other elements.
Embodiment 5
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and calgon, is modulated into the first ore pulp that concentration is 40wt%, institute
The concentration for stating the calgon in the first ore pulp is 1.5wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.025mm grades wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon object
Material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 25wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 4.89wt%, iron 28.52wt%, carbon 35.22wt%, chlorine 1.91wt%, surplus are other yuan
Element；
Iron product: zinc 1.29wt%；Iron 45.51wt%, carbon 26.59wt%, chlorine 0.91wt%, surplus are other elements；
Carbon products: zinc 2.03wt%；Iron 21.06wt%, carbon 46.16wt%, chlorine 0.83wt%, surplus are other elements.
Embodiment 6
The method for present embodiments providing a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water, the first ore pulp that concentration is 30wt% is modulated into, using Pulp pump by first
For pulp conveying to high-frequency screen, 0.025mm grades of progress is wet sieving, obtains including zinc particles of the granularity less than 0.025mm and granularity exists
The iron content of 0.025mm or more, carbon material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 20wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in the present embodiment
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 4.04wt%, iron 30.51wt%, carbon 36.61wt%, chlorine 1.99wt%, surplus are other yuan
Element；
Iron product: zinc 1.33wt%；Iron 44.43wt%, carbon 31.71wt%, chlorine 0.95wt%, surplus are other elements；
Carbon products: zinc 1.96wt%；Iron 23.62wt%, carbon 40.36wt%, chlorine 0.88wt%, surplus are other elements.
Comparative example 1
This comparative example provides the method for a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and calgon, is modulated into the first ore pulp that concentration is 30wt%, institute
The concentration for stating the calgon in the first ore pulp is 1wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.02mm grades wet sieving, obtains granularity less than the iron content in 0.02mm or more of including zinc particles and granularity of 0.02mm, carbon material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 20wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in this comparative example
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 6.14wt%, iron 25.26wt%, carbon 32.57wt%, chlorine 1.78wt%, surplus are other yuan
Element；
Iron product: zinc 1.35wt%；Iron 49.15wt%, carbon 25.13wt%, chlorine 0.95wt%, surplus are other elements；
Carbon products: zinc 1.98wt%；Iron 21.68wt%, carbon 45.23wt%, chlorine 0.81wt%, surplus are other elements.
Comparative example 2
This comparative example provides the method for a kind of combined recovery zinc, iron and/or carbon from blast furnace dust, the method packet
Include following steps:
(1) blast furnace dust is mixed with water and calgon, is modulated into the first ore pulp that concentration is 30wt%, institute
The concentration for stating the calgon in the first ore pulp is 1wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.03mm grades wet sieving, obtains granularity less than the iron content in 0.03mm or more of including zinc particles and granularity of 0.03mm, carbon material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 20wt% is modulated into, by the second ore pulp in spiral
Spiral separating is carried out in sorting machine, is dehydrated after the completion, carbon products and iron product are obtained, and including zinc particles obtained by step (1) are de-
Zinc-rich product is obtained after water, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
Blast furnace dust used in 1-5 of the embodiment of the present invention and comparative example 1-2 is with a batch of blast furnace dust, blast furnace
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon 37.27wt%, chlorine 5.74wt%, water in gas ash
1.53wt%, surplus are other elements.
Element composition includes: zinc 2.18wt%, iron 31.30wt%, carbon in blast furnace dust in this comparative example
37.27wt%, chlorine 5.74wt%, water 1.53wt%, surplus are other elements.
Zinc-rich product: zinc 5.01wt%, iron 30.11wt%, carbon 34.18wt%, chlorine 1.84wt%, surplus are other yuan
Element；
Iron product: zinc 0.91wt%；Iron 48.28wt%, carbon 26.09wt%, chlorine 1.01wt%, surplus are other elements；
Carbon products: zinc 1.83wt%；Iron 19.23wt%, carbon 46.83wt%, chlorine 0.85wt%, surplus are other elements.
In conclusion the present invention is wet sieving by 0.025mm grades, blast furnace dust is divided into including zinc particles and contained
Iron, carbon material select the method pair of spiral separating then according to iron, the density contrast of carbon and iron content, the granularity feature of carbon material
Iron, carbon are sorted, thus realize the separation and recovery to zinc, iron and/or carbon in blast furnace dust, the Zn content in zinc-rich product
The middle iron content of up to 6.01wt%, iron product are up to 50.45wt%, and the carbon content in carbon products is up to 51.14wt%.This hair
Bright the method is simple and easy, Yi Jinhang industrialization promotion.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of method of combined recovery zinc, iron and/or carbon from blast furnace dust, which is characterized in that the method includes with
Lower step:
(1) blast furnace dust is modulated into the first ore pulp, 0.025mm grades of progress is wet sieving, obtains granularity less than 0.025mm's
Iron content in 0.025mm or more of including zinc particles and granularity, carbon material；
(2) iron content that step (1) obtains, carbon material are modulated into the second ore pulp, carry out spiral separating processing, spiral separating is completed
After be dehydrated, obtain carbon products and iron product.
2. the method according to claim 1, wherein step (1) described blast furnace dust is modulated into the first ore pulp
Operation include: mixing blast furnace dust and water, obtain the first ore pulp；
Preferably, the concentration of step (1) first ore pulp is 20-40wt%, preferably 25-35wt%.
3. method according to claim 1 or 2, which is characterized in that step (1) is described wet sieving to be carried out in high-frequency screen.
4. according to the method described in claim 3, it is characterized in that, step (1) the wet sieving operation includes: to utilize slag
Stock pump carries out the first pulp conveying to high-frequency screen wet sieving.
5. method according to claim 1-4, which is characterized in that also contain dispersing agent in first ore pulp；
Preferably, dispersing agent includes any one in hydrolysis of polymaleic anhydride, calgon or waterglass or at least two
Combination；
Preferably, the concentration of the dispersing agent is 0.8-1.5wt%.
6. method according to claim 1-5, which is characterized in that modulate iron content obtained by step (1), carbon material
Operation at the second ore pulp includes: mixing iron content, carbon material and water, obtains the second ore pulp；
Preferably, the concentration of second ore pulp is 15-25wt%.
7. method according to claim 1-6, which is characterized in that the method includes described in step (1) to containing
The step of zinc particle is dehydrated, and zinc-rich product is obtained；
Preferably, gained water after including zinc particles dehydration, for modulating the first ore pulp and/or the second ore pulp.
8. method according to claim 1-7, which is characterized in that step (2) screw sieving is in spiral point
It selects in machine and carries out.
9. method according to claim 1-8, which is characterized in that gained water is used for after step (2) described dehydration
Modulate the first ore pulp and/or the second ore pulp.
10. -9 described in any item methods according to claim 1, which is characterized in that described method includes following steps:
(1) by blast furnace dust and water and dispersant, it is modulated into the first ore pulp that concentration is 20-40wt%, described the
Dispersant concentration in one ore pulp is 0.8-1.5wt%, using Pulp pump by the first pulp conveying to high-frequency screen, is carried out
0.025mm grades wet sieving, obtains granularity less than the iron content in 0.025mm or more of including zinc particles and granularity of 0.025mm, carbon object
Material；
(2) iron content, carbon material and water are mixed, the second ore pulp that concentration is 15-25wt% is modulated into, by the second ore pulp in spiral point
It selects and carries out spiral separating in machine, be dehydrated after the completion, obtain carbon products and iron product, the dehydration of including zinc particles obtained by step (1)
After obtain zinc-rich product, water obtained by above-mentioned dehydration is for modulating the first ore pulp and/or the second ore pulp.
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