CN107123533A - The system and method for preparing magnetic powder product - Google Patents
The system and method for preparing magnetic powder product Download PDFInfo
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- CN107123533A CN107123533A CN201710349065.0A CN201710349065A CN107123533A CN 107123533 A CN107123533 A CN 107123533A CN 201710349065 A CN201710349065 A CN 201710349065A CN 107123533 A CN107123533 A CN 107123533A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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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
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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Abstract
The invention discloses a kind of method and system for preparing magnetic powder product.The system includes the first mixing arrangement, shaped device, the second mixing arrangement, Wrap device, oxidizing roasting device, reduction roasting device and separation concentration equipment.Shaped device is connected with the first mixing arrangement and Wrap device respectively, and Wrap device is also connected with the second mixing arrangement and oxidizing roasting device respectively, reduction roasting device respectively with oxidizing roasting device and separate concentration equipment be connected.The invention comprehensively utilizes the waste residue that a variety of industry are produced, solve Industrial Solid Waste stores up problem, with good economy and environmental benefit.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to the system and method for preparing magnetic powder product.
Background technology
Nonferrous metallurgy slag refers to that pyrogenic process extracts the slag of the non-ferrous metal such as generation such as copper, nickel, wherein containing about 40% iron, its
Mainly with fayalite (2FeOSiO2) form presence, also have a small amount of with magnetic iron ore (Fe3O4) form presence.Due to iron olive
Stone direct-reduction difficulty is larger, and the sulfur content in such metallurgical slag is general higher, if directly carrying out reduction extracts iron, sulphur member
Element can enter in iron, as product impurity.
Red mud is that bauxite extracts topmost solid residue produced after aluminum oxide, because wherein containing a large amount of iron oxide
And it is presented red, therefore referred to as red mud.Current red mud is in addition to small part is applied to the purposes such as manufacture of cement, brickmaking, mostly
In the outdoor state of storing up of building a dam.Contain Fe in red mud2O3, the material such as CaO, MgO.
Carbide slag is in the industrial products production process such as acetylene, polyvinyl chloride, polyvinyl alcohol, to be produced after calcium carbide hydrolysis
Sediment, Main Ingredients and Appearance is calcium hydroxide.Accumulation not only takes a large amount of soils to carbide slag for a long time, and has serious erosion to soil
Effect.Therefore, carbide slag is included the IIth class general industrial solid waste by national environmental protection portion, it is desirable to be managed.Mesh
Before, the carbide slag produced in production process is that therefore, handling these carbide slag discarded objects not only needs as offal treatment
Substantial amounts of manpower and materials are spent, the waste of resource is also created.
The content of the invention
For Industrial Solid Waste intractability it is big the problem of, the present invention by using the waste residue produced in aluminum oxide production process
The waste residue carbide slag produced during red mud and production calcium carbide is used as the metallurgy produced during pelletizing shell, production non-ferrous metal
Slag prepares magnetic iron product as pelletizing kernel.
The system that what the present invention was provided prepare magnetic powder product, including：
First mixing arrangement, provided with the outlet of nonferrous metallurgy slag entrance, binding agent entrance and the first compound；
Shaped device, is exported provided with the first compound entrance and the first pelletizing, the first compound entrance and described the
The first compound outlet of one mixing arrangement is connected；
Second mixing arrangement, provided with the outlet of red mud entrance, carbide slag entrance and the second compound；
Wrap device, provided with the first pelletizing entrance, the second compound entrance and the outlet of parcel pelletizing, first pelletizing enters
Mouth is connected with the first pelletizing outlet of the shaped device, and the second compound entrance is mixed with the second of second mixing arrangement
Material outlet is connected；
Oxidizing roasting device, provided with parcel pelletizing entrance, oxidizing gas entrance and acid pellet outlet, the parcel ball
Group's entrance is connected with the parcel pelletizing outlet of the Wrap device；
Reduction roasting device, provided with acid pellet entrance, also Primordial Qi entrance, reducting pellet outlet and efflorescence housing outlet,
The acid pellet entrance is connected with the acid pellet outlet of the oxidizing roasting device；
Concentration equipment is separated, it is described to go back protocorm provided with reducting pellet entrance, magnetic powder outlet and namagnetic substance outlet
Group's entrance is connected with the reducting pellet outlet of the reduction roasting device.
Preferably, said system also includes：
First breaker, provided with feed(raw material)inlet and powder outlet, the powder outlet and first mixing arrangement
Nonferrous metallurgy slag entrance is connected；
Second breaker, provided with feed(raw material)inlet and powder outlet, the powder outlet and second mixing arrangement
Carbide slag entrance is connected；
Drying unit, is exported provided with feed(raw material)inlet and drying material, the drying material outlet and second mixing arrangement
Red mud entrance is connected.
Present invention also offers a kind of method that utilization said system prepares magnetic powder, comprise the following steps：
Prepare coloured metallurgical slag, red mud and carbide slag；
The nonferrous metallurgy slag is sent into first mixing arrangement and is well mixed with binding agent, first is obtained and mixes
Material；
First compound is sent into the shaped device and is molded, the first pelletizing is obtained；
Red mud and carbide slag are sent into the second mixing arrangement and are well mixed, the second compound is obtained；
First pelletizing and second compound are sent into the Wrap device, second compound wrapped up in attached
On the surface of first pelletizing, parcel pelletizing is obtained；
The parcel pelletizing is sent into the oxidizing roasting device, is calcined in oxidizing atmosphere, oxidation ball is obtained
Group；
The acid pellet is sent into the reduction roasting device, is calcined, is reduced under weakly reducing atmosphere
Pelletizing and efflorescence shell；
By in the reducting pellet feeding separation concentration equipment, magnetic separation is carried out after crushing, magnetic powder is obtained.
Preferably, the mol ratio of the calcium oxide (CaO) in the carbide slag and the sulphur in the nonferrous metallurgy slag is (2-
5)：1.
Preferably, the mass ratio of the red mud and the carbide slag is (3-6)：10.
Preferably, sintering temperature of the parcel pelletizing in the oxidizing roasting device is 800 DEG C -1200 DEG C.
Preferably, oxygen (O in the oxidizing atmosphere2) volumn concentration >=20%.
Preferably, sintering temperature of the acid pellet in the reduction roasting device is 600 DEG C -1000 DEG C.
Preferably, the volumn concentration of carbon monoxide (CO) is 2000ppm-5000ppm, oxygen in the weakly reducing atmosphere
Gas (O2) volumn concentration be 3%-7%.
Preferably, in the nonferrous metallurgy slag iron weight/mass percentage composition >=40%.
Preferably, in the carbide slag CaO weight/mass percentage composition >=56%.
Preferably, di-iron trioxide (Fe in the red mud2O3) weight/mass percentage composition >=35%, sodium oxide molybdena (Na2O) and
Potassium oxide (K2O weight/mass percentage composition sum >=3%), titanium dioxide (TiO2) weight/mass percentage composition >=1.7%.
Product magnetic separation iron powder of the present invention, as raw material, adds a small amount of conventional binders, product only with a variety of Industrial Solid Wastes
Iron grade is high, sulfur content is low, is quality product, can be used as steelmaking feed.
Raw material in the present invention is the solid waste product of a variety of industries, can solve the problem of storing up by comprehensive utilization, have
Beneficial to improvement environment.
The shell of pelletizing is wrapped up in the present invention to be removed using equipment, you can obtain the iron content pelletizing of internal reduction.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in the system for preparing magnetic powder structural representation；
Fig. 2 is the process chart for preparing magnetic powder in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and examples, the embodiment to the present invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
Apply the purpose that example is only explanation, rather than limitation of the present invention.
Pelletizing is made after being well mixed nonferrous metallurgy slag and certain binding agent in the present invention, and red mud and carbide slag are according to one
It is wrapped in after certainty ratio is well mixed as shell on pelletizing, forms parcel pelletizing.Pelletizing will be wrapped up first under oxidizing atmosphere
Roasting a period of time is carried out, enters back into weak reducing atmosphere and is calcined, promote pelletizing shell to occur in reduction process swollen
Burst and split, you can the pelletizing after being reduced.Reducting pellet is subjected to crushing-magnetic selection, you can obtain Iron grade height, sulfur content low
Magnetic powder
As shown in figure 1, the system for preparing magnetic powder that the present invention is provided includes：First breaker 1, first mixing dress
Put 2, shaped device 3, drying unit 4, the second breaker 5, the second mixing arrangement 6, Wrap device 7, oxidizing roasting device 8,
Reduction roasting device 9 and separation concentration equipment 10.
First breaker 1 is used to nonferrous metallurgy slag being crushed to appropriate particle size, in order to subsequent forming.First broken dress
Put 1 and be provided with feed(raw material)inlet and powder outlet.Said system can not also include the first breaker 1, directly using appropriate particle size
Nonferrous metallurgy slag.
First mixing arrangement 2 is used to mix coloured metallurgical slag and binding agent.First mixing arrangement 2 enters provided with nonferrous metallurgy slag
Mouth, binding agent entrance and the outlet of the first compound, nonferrous metallurgy slag entrance are connected with the powder outlet of the first breaker 1.
Shaped device 3 is used to nonferrous metallurgy slag being prepared into pelletizing.Shaped device 3 is provided with the first compound entrance and first
Pelletizing is exported, and the first compound entrance is connected with the first compound outlet of the first mixing arrangement 2.
Drying unit 4 is used to dry red mud raw material.Drying unit 4 is exported provided with feed(raw material)inlet and drying material.If red mud is former
The moisture of material is not high, and said system can not also include drying unit 4.
Second breaker 5 is used to carbide slag being crushed to appropriate particle size, in order to subsequent forming.Second breaker 5
Provided with feed(raw material)inlet and powder outlet.Said system can not also include the second breaker 5, directly using the electricity of appropriate particle size
Rock ballast.
Second mixing arrangement 6 is used to mix red mud and carbide slag.Second mixing arrangement 6 enters provided with red mud entrance, carbide slag
Mouthful and the outlet of the second compound, the drying material outlet of red mud entrance and drying unit 4 is connected, and carbide slag entrance and second is crushed and filled
The powder outlet for putting 5 is connected.
Wrap device 7, which is used to uniformly wrap up the mixture (the second compound) of red mud and carbide slag, arrives nonferrous metallurgy slag system
The surface of the pelletizing (the first pelletizing) obtained, obtains parcel pelletizing.Wrap device 7 enters provided with the first pelletizing entrance, the second compound
Mouthful and the outlet of parcel pelletizing, the first pelletizing of the first pelletizing entrance and shaped device 3, which is exported, to be connected, the second compound entrance and the
The second compound outlet of two mixing arrangements 6 is connected.
Oxidizing roasting device 8 is used to carry out roasting parcel pelletizing in oxidizing atmosphere.Oxidizing roasting device 8 is provided with parcel
Pelletizing entrance, oxygen-containing gas entrance and acid pellet outlet, the parcel pelletizing of parcel pelletizing entrance and Wrap device 7 export phase
Even.
Reduction roasting device 9 is used for the roasting oxidation pelletizing under weakly reducing atmosphere.Reduction roasting device 9 is provided with acid pellet
Entrance, reducibility gas entrance, reducting pellet outlet and efflorescence housing outlet, acid pellet entrance and oxidizing roasting device 8
Acid pellet outlet is connected.
Separation concentration equipment 10 is used to crush reducting pellet and then magnetic separation obtains magnetic powder.Separation concentration equipment 10 is provided with
Reducting pellet entrance, magnetic powder outlet and namagnetic substance outlet, reducting pellet entrance go back protocorm with reduction roasting device 9
Group outlet is connected.
As shown in Fig. 2 the method that the utilization said system that the present invention is provided prepares magnetic powder, comprises the following steps：
Nonferrous metallurgy slag and carbide slag are sent into the first breaker 1 and the second breaker 5 respectively and are broken into powder,
Red mud is sent into drying unit 4 and dried；
Nonferrous metallurgy slag after will be broken is sent into the first mixing arrangement 2 to be well mixed with binding agent, is obtained first and is mixed
Material；
First compound is sent into shaped device 3 and is molded, the first pelletizing is obtained；
By the red mud after drying and it is broken after carbide slag send into the second mixing arrangement 6 and be well mixed, obtain second and mix
Close material；
By in the first pelletizing and the second compound feeding Wrap device 7, the second compound is wrapped up in the table for being attached to the first pelletizing
Face, obtains parcel pelletizing；
Parcel pelletizing is sent into oxidizing roasting device 8, is calcined in oxidizing atmosphere, obtains acid pellet；
Acid pellet is sent into reduction roasting device 9, is calcined under weakly reducing atmosphere, reducting pellet and powder is obtained
Outside the pale of civilization shell；
By in reducting pellet feeding separation concentration equipment 10, magnetic separation is carried out after crushing, magnetic powder is obtained.
Above-mentioned nonferrous metallurgy slag refers to the product that pyrometallurgical smelting non-ferrous metal (such as copper, nickel) is obtained, and wherein iron is main with iron
Olivine (2FeOSiO2) form presence, also a small amount of magnetic iron ore (Fe3O4).In the preferred embodiment of the invention, coloured smelting
Weight/mass percentage composition >=40% of iron in golden slag.If the iron content in nonferrous metallurgy slag is relatively low, final products magnetic can be reduced
The yield of iron, influences economic benefit.
Above-mentioned red mud is that the iron that bauxite is extracted in the solid residue produced after aluminum oxide, red mud is main with bloodstone
(Fe2O3) form presence.In the preferred embodiment of the invention, Fe in red mud2O3Weight/mass percentage composition >=35%, Na2O and
K2O weight/mass percentage composition sum >=3%, TiO2Weight/mass percentage composition >=1.7%.This is due in follow-up week reduction gas
In body roasting process, bloodstone is being reduced into magnetic iron ore (Fe in red mud3O4) during, can be extremely swollen using its unit cell volume
Swollen property causes the rupture and efflorescence of pelletizing, if Fe2O3Content is less, then is unable to reach the effect；And the alkali metal such as K and Na
It can be embedded in reducing roasting process in bloodstone, increase the lattice defect number of bloodstone, promote it being reduced into magnetic iron ore
Shi Fasheng abnormal expansions and rupture, if content is too low, it is impossible to reach the effect；TiO2Presence can also promote the hair of powder phenomenon-tion
It is raw, if content is too low, it is impossible to ensure the abundant efflorescence of pelletizing, so as to influence follow-up magnetic separation effect.
Above-mentioned carbide slag is that calcium carbide hydrolysis obtains the residue after acetylene gas, and its main component is calcium hydroxide (Ca
(OH)2), simultaneously containing a certain amount of alkali metal (K, Na etc.) and alkaline-earth metal (Mg etc.).In the preferred embodiment of the invention,
Weight/mass percentage composition >=56% of calcium oxide (CaO) in carbide slag., can not be during oxidizing roasting if CaO content is less
Fully reacted with the sulphur that is volatilized in nonferrous metallurgy slag, so that desulfurization efficiency can be influenceed.
Binding agent used in the present invention is conventional binders species, one kind or any such as bentonite, molasses, starch
Several mixtures.In the preferred embodiment of the invention, the mass ratio of binding agent and nonferrous metallurgy slag is (2-5):100.
Sulfur content of the consumption of carbide slag in nonferrous metallurgy slag is determined.In the preferred embodiment of the invention, calcium carbide
The mol ratio of the CaO and S in nonferrous metallurgy slag in slag is (2-5)：1.If carbide slag consumption is very few, it is impossible to by nonferrous metallurgy slag
In the sulphur that volatilizes be completely fixed；If carbide slag consumption is excessive, material waste is not only caused, can also increase pelletizing outer casing thickness,
So as to influence heat to the transmission of pelletizing kernel, the reduction reaction inside influence.
The caking property of red mud is stronger, therefore can increase the caking property of pelletizing shell, is conducive to balling-up；Simultaneously because in red mud
Bloodstone be changed into weak reducing atmosphere roasting process after magnetic iron ore and can occur volumetric expansion, so as to cause pelletizing shell
Efflorescence is ruptured so that shell and the separation of pelletizing kernel, without extra increase separator.In the preferred embodiment of the invention,
The mass ratio of red mud and carbide slag is (3-6)：10.
In the present invention, O in the calcination atmosphere of oxidizing roasting2Volumn concentration >=20%, the sulphur in nonferrous metallurgy slag
SO is generated with oxygen2, and the calcareous material diffused in pelletizing shell and carbide slag reacts generation solid matter, reaches solid
The purpose of sulphur.Fe in outer layer red mud2O3SO can be catalyzed2It is changed into SO3, while can also reduce the agglomeration of desulfurization product.
In the preferred embodiment of the invention, sintering temperature of the parcel pelletizing in oxidizing roasting device 8 for 800 DEG C-
1200℃.The temperature of oxidizing roasting is more than 800 DEG C, and the fayalite in nonferrous metallurgy slag can just react generation with oxygen
Armco magnetic iron；Bonded if fusing can occur for the low melting point that temperature is higher than in 1200 DEG C, nonferrous metallurgy slag, not only influence pelletizing strong
Degree, can also influence SO2The efficiency of gas outer layers diffusion, reduces desulfurized effect.At this temperature, roasting time preferably is
15min-30min, if roasting time is too short, the fayalite in nonferrous metallurgy slag is without fully reaction generation Armco magnetic iron, shadow
Ring later separation extraction effect；It is the waste to the energy if roasting time is long.
Containing many kinds of substance in red mud and carbide slag in pelletizing shell, in reducing roasting process, bloodstone can be increased
Structure cell, and promote bloodstone occur distortion of lattice.Alkali metal (Na, K etc.) and alkaline-earth metal in carbide slag and red mud
In (Ca, Mg etc.) embedded bloodstone, lattice defect number is added.The distribution of lattice defect and various components be it is irregular,
It is this irregularly to determine that diffusion coefficient of each component in reduction is different in hematite crystals.It is red that structure cell increase is distorted
When iron ore reduction is into magnetic iron ore, it is many that volume increases, and the stress of generation is also big, therefore causes the abnormal expansion and powder of pelletizing shell
Change.Further, since containing a certain amount of TiO in red mud2, the phase transition temperature that bloodstone is converted to magnetic iron ore can be reduced, it is simultaneously raw
Into glass phase toughness value it is very low, be the fragile ore deposit phase of comparison, when unit cell volume increases, the increase of the stress of surrounding, glass phase
Easily it is broken, therefore promotes the further generation of powder phenomenon-tion.
Meanwhile, the Fe in pelletizing kernel2O3Also can occur reduction reaction, by controlling calcination atmosphere to be weak reducing atmosphere,
Therefore reduzate is Fe3O4(ferromagnetism), is easier to be sorted during later separation magnetic separation, improves the recovery effect of iron
Rate.Further, since only having a small amount of alkali metal or alkaline-earth metal in pelletizing kernel, in Fe2O3Reduction generation Fe3O4During not
Unit cell volume increase extremely can be caused, therefore will not occur karyorrhexis and efflorescence in pelletizing.
Weakly reducing atmosphere refers to containing reducibility gas CO oxygen content very low atmosphere.In currently preferred reality
Apply in example, CO volumn concentration is 2000ppm-5000ppm, O in weakly reducing atmosphere2Volumn concentration be 3%-
7%., can be by the Fe in pelletizing kernel if CO too high levels, the reproducibility of gas is too strong2O3FeO is restored to, FeO is non-magnetic
Property material, it is impossible to separated in subsequent process with gangue material；If O2Too high levels, it is impossible to promote bloodstone to occur reduction anti-
Magnetic iron ore should be generated, the swelling fracture of pelletizing shell has not both been resulted in, reducting pellet can not be also obtained.
In the preferred embodiment of the invention, sintering temperature of the acid pellet in reduction roasting device 9 be 600 DEG C-
1000℃.If sintering temperature is too low, it is impossible to promote bloodstone to change to magnetic iron ore, the expansion efflorescence of pelletizing shell is not reached
Purpose；If sintering temperature is too high, the fusing of pelletizing kernel, influence desulfurization and reduction effect can be caused.
The invention provides the preparation method of magnetic powder product and system, various industrial waste residues are fully utilized, and
Iron grade is high, sulfur content is low, is used directly for ironmaking.
Raw material in the present invention is the solid waste product of a variety of industries, it is only necessary to adds a small amount of binding agent, can reach and carry
The effect of iron desulfurization is taken, the problem of storing up can be solved by comprehensive utilization, is conducive to improving environment.
Parcel pelletizing in the present invention need not additionally increase equipment and remove shell, and automatic efflorescence can occur for shell, obtain
Internal reducting pellet.
Below with reference to specific embodiment, the present invention will be described.Institute's taking technique condition value is in following embodiments
Exemplary, its desirable number range is as shown in foregoing summary.Detection method used in following embodiments is one's own profession
The conventional detection method of industry.
Embodiment 1
The present embodiment prepares magnetic powder using the system shown in Fig. 1 and the technological process shown in Fig. 2, specific as follows：
Nonferrous metallurgy slag uses Flash Smelting Furnace nickel metallurgy tailings, and its iron content is 40.22%, sulfur content 0.22%；Red mud
Fe2O3Content 36.56%, Na2O content 3.21%, K2O content 0.77%, TiO2Content 1.73%；The CaO content of carbide slag is
60.98%, K2O content 0.08%, Na2O content 0.05%, TiO2Content 0.07%.
First, respectively by Flash Smelting Furnace nickel metallurgy tailings, carbide slag raw material is levigate to accounting for 75% below 200 mesh, by red mud raw material
Moisture is dried to 5%.Flash Smelting Furnace nickel metallurgy tailings and molasses are by weight 100:3 ratio is mixed, well mixed material
The first pelletizing that particle diameter is 8mm is made.The mol ratio of the CaO and S in Flash Smelting Furnace nickel metallurgy tailings in carbide slag is 2：1, red mud
With carbide slag by weight 30:100 are mixed as pelletizing shell material, are wrapped on the first pelletizing, obtain parcel pelletizing.
Secondly, pelletizing will be wrapped up to be calcined in the case where oxygen content is 23% atmosphere, sintering temperature is 800 DEG C, roasting
Time is 30min, obtains acid pellet.
Then, acid pellet is placed under weakly reducing atmosphere and be calcined, wherein, CO contents are 2000ppm, O2Content is
7%, 600 DEG C of sintering temperature, pelletizing shell expands efflorescence in roasting process, obtains reducting pellet.
Finally, by reducting pellet crushing-magnetic selection, final products are magnetic powder.The Iron grade of magnetic powder is 70%, sulphur
Content is 0.023%.
Embodiment 2
The present embodiment prepares magnetic powder using the system shown in Fig. 1 and the technological process shown in Fig. 2, specific as follows：
Nonferrous metallurgy slag uses copper smelting by pyrometallurgy slag flotation mine tailing, and its iron content is 41.33%, sulfur content 0.70%；Red mud
Fe2O3Content 37.81%, Na2O content 4.02%, K2O content 0.27%, TiO2Content 1.98%；The CaO content of carbide slag
For 58.96%, content of MgO 0.94%, K2O content 0.06%, Na2O content 0.04%, TiO2Content 0.07%.
First, respectively by copper smelting by pyrometallurgy slag flotation mine tailing, carbide slag raw material is levigate to accounting for 75% below 200 mesh, by red mud
Raw material stoving is to moisture 6%.Copper smelting by pyrometallurgy slag flotation mine tailing and molasses are by weight 100:5 ratio is mixed, and is mixed
Close uniform material and the first pelletizing that particle diameter is 10mm is made.Mole of CaO and the S in Flash Smelting Furnace nickel metallurgy tailings in carbide slag
Than for 3：1, red mud and carbide slag are by weight 45:100 are mixed as pelletizing shell material, are wrapped on the first pelletizing,
Obtain parcel pelletizing.
Secondly, pelletizing will be wrapped up to be calcined in the case where oxygen content is 25% atmosphere, sintering temperature is 1000 DEG C, roasting
Time is 20min, obtains acid pellet.
Then, acid pellet is placed under weakly reducing atmosphere and be calcined, wherein, CO contents are 3500ppm, O2Content is
5%, 800 DEG C of sintering temperature, pelletizing shell expands efflorescence in roasting process, obtains reducting pellet.
Finally, by reducting pellet crushing-magnetic selection, final products are magnetic powder.The Iron grade of magnetic powder is 72%, sulphur
Content is 0.008%.
Embodiment 3
The present embodiment prepares magnetic powder using the system shown in Fig. 1 and the technological process shown in Fig. 2, specific as follows：
Nonferrous metallurgy slag uses copper smelting by pyrometallurgy slag tailings, and its iron content is 43.86%, sulfur content 1.03%；Red mud
Fe2O3Content 35.51%, Na2O content 3.26%, K2O content 0.34%, TiO2Content 3.31%；The CaO content of carbide slag is
65.09%, content of MgO 1.02%, K2O content 0.09%, Na2O content 0.05%, TiO2Content 0.09%.
First, respectively by copper smelting by pyrometallurgy slag flotation mine tailing, carbide slag raw material is levigate to accounting for 75% below 200 mesh, by red mud
Raw material stoving is to moisture 5%.Copper smelting by pyrometallurgy slag flotation mine tailing and molasses are by weight 100:5 ratio is mixed, and is mixed
Close uniform material and the first pelletizing that particle diameter is 12mm is made.Mole of CaO and the S in Flash Smelting Furnace nickel metallurgy tailings in carbide slag
Than for 5：1, red mud and carbide slag are by weight 60:100 are mixed as pelletizing shell material, are wrapped on the first pelletizing,
Obtain parcel pelletizing.
Secondly, pelletizing will be wrapped up to be calcined in the case where oxygen content is 22% atmosphere, sintering temperature is 1200 DEG C, roasting
Time is 15min, obtains acid pellet.
Then, acid pellet is placed under weakly reducing atmosphere and be calcined, wherein, CO contents are 5000ppm, O2Content is
3%, 1000 DEG C of sintering temperature, pelletizing shell expands efflorescence in roasting process, obtains reducting pellet.
Finally, by reducting pellet crushing-magnetic selection, final products are magnetic powder.The Iron grade of magnetic powder is 71%, sulphur
Content is 0.015%.
It was found from above-described embodiment, the Iron grade of magnetic powder produced by the present invention is high.
To sum up, the invention comprehensively utilizes the waste residue that a variety of industry are produced, solve Industrial Solid Waste stores up problem, has
Good economy and environmental benefit.
Present invention only requires a small amount of conventional binders are added, the effect for extracting iron desulfurization can be reached, obtained magnetic production
Thing Iron grade is high, can be directly as steelmaking feed, with good economic benefit.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and not to embodiment
Limit.For those of ordinary skill in the field, other multi-forms can also be made on the basis of the above description
Change or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is apparent
Change or change still in protection scope of the present invention among.
Claims (10)
1. prepare the system of magnetic powder product, it is characterised in that including：
First mixing arrangement, provided with the outlet of nonferrous metallurgy slag entrance, binding agent entrance and the first compound；
Shaped device, is exported, the first compound entrance is mixed with described first provided with the first compound entrance and the first pelletizing
The the first compound outlet put is attached together to be connected；
Second mixing arrangement, provided with the outlet of red mud entrance, carbide slag entrance and the second compound；
Wrap device, provided with the first pelletizing entrance, the second compound entrance and parcel pelletizing outlet, the first pelletizing entrance with
The first pelletizing outlet of the shaped device is connected, and the second compound of the second compound entrance and second mixing arrangement goes out
Mouth is connected；
Oxidizing roasting device, provided with parcel pelletizing entrance, oxidizing gas entrance and acid pellet outlet, the parcel pelletizing enters
Mouth is connected with the parcel pelletizing outlet of the Wrap device；
Reduction roasting device, provided with acid pellet entrance, reducibility gas entrance, reducting pellet outlet and efflorescence housing outlet,
The acid pellet entrance is connected with the acid pellet outlet of the oxidizing roasting device；
Concentration equipment is separated, provided with reducting pellet entrance, magnetic powder outlet and namagnetic substance outlet, the reducting pellet enters
Mouth is connected with the reducting pellet outlet of the reduction roasting device.
2. system according to claim 1, it is characterised in that also include：
First breaker, provided with feed(raw material)inlet and powder outlet, the powder outlet is coloured with first mixing arrangement
Metallurgical slag entrance is connected；
Second breaker, provided with feed(raw material)inlet and powder outlet, the calcium carbide of the powder outlet and second mixing arrangement
Slag entrance is connected；
Drying unit, is exported provided with feed(raw material)inlet and drying material, the drying material outlet and the red mud of second mixing arrangement
Entrance is connected.
3. the method that the system described in a kind of utilization claim 1 or 2 prepares magnetic powder product, it is characterised in that including such as
Lower step：
Prepare coloured metallurgical slag, red mud and carbide slag；
The nonferrous metallurgy slag is sent into first mixing arrangement and is well mixed with binding agent, the first compound is obtained；
First compound is sent into the shaped device and is molded, the first pelletizing is obtained；
Red mud and carbide slag are sent into the second mixing arrangement and are well mixed, the second compound is obtained；
First pelletizing and second compound are sent into the Wrap device, second compound is wrapped up in and is attached to institute
The surface of the first pelletizing is stated, parcel pelletizing is obtained；
The parcel pelletizing is sent into the oxidizing roasting device, is calcined in oxidizing atmosphere, obtains acid pellet；
The acid pellet is sent into the reduction roasting device, is calcined under weakly reducing atmosphere, reducting pellet is obtained
With efflorescence shell；
By in the reducting pellet feeding separation concentration equipment, magnetic separation is carried out after crushing, magnetic powder is obtained.
4. method according to claim 3, it is characterised in that calcium oxide and the nonferrous metallurgy slag in the carbide slag
In sulphur mol ratio be (2-5)：1.
5. method according to claim 3, it is characterised in that the mass ratio of the red mud and the carbide slag is (3-6)：
10。
6. method according to claim 3, it is characterised in that roasting of the parcel pelletizing in the oxidizing roasting device
It is 800 DEG C -1200 DEG C to burn temperature.
7. method according to claim 3, it is characterised in that roasting of the acid pellet in the reduction roasting device
It is 600 DEG C -1000 DEG C to burn temperature.
8. method according to claim 3, it is characterised in that the volumn concentration of oxygen in the oxidizing atmosphere >=
20%；The volumn concentration of carbon monoxide is 2000ppm-5000ppm in the weakly reducing atmosphere, and the volume basis of oxygen contains
Measure as 3%-7%.
9. method according to claim 3, it is characterised in that the weight/mass percentage composition of iron in the nonferrous metallurgy slag >=
40%.
10. method according to claim 3, it is characterised in that the weight/mass percentage composition of calcium oxide in the carbide slag >=
56%；The weight/mass percentage composition of weight/mass percentage composition >=35% of di-iron trioxide in the red mud, sodium oxide molybdena and potassium oxide it
With >=3%, weight/mass percentage composition >=1.7% of titanium dioxide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113458406A (en) * | 2021-06-29 | 2021-10-01 | 河北林松金属粉末科技有限公司 | Method for quickly producing superfine iron powder |
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