CN107099657A - Comprehensively utilize the system and method for Industrial Solid Waste - Google Patents

Comprehensively utilize the system and method for Industrial Solid Waste Download PDF

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Publication number
CN107099657A
CN107099657A CN201710349526.4A CN201710349526A CN107099657A CN 107099657 A CN107099657 A CN 107099657A CN 201710349526 A CN201710349526 A CN 201710349526A CN 107099657 A CN107099657 A CN 107099657A
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CN
China
Prior art keywords
entrance
pelletizing
outlet
slag
fragmentation
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CN201710349526.4A
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Chinese (zh)
Inventor
王欣
刘占华
陈文亮
王岩
丁银贵
曹志成
吴道洪
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Priority to CN201710349526.4A priority Critical patent/CN107099657A/en
Publication of CN107099657A publication Critical patent/CN107099657A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • 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
    • C22B1/26—Cooling of roasted, sintered, or agglomerated ores

Abstract

The invention discloses the system and method for comprehensive utilization Industrial Solid Waste.The system includes mixing arrangement, provided with the outlet of nonferrous metallurgy slag entrance, red mud entrance, carbide slag entrance and compound；Shaped device, is exported provided with compound entrance and pelletizing, and compound entrance is connected with the compound outlet of mixing arrangement；Oxidizing roasting device, provided with the outlet of pelletizing entrance, oxidizing gas entrance and acid pellet, pelletizing entrance is connected with the pelletizing outlet of shaped device；Reduction roasting device, provided with the outlet of acid pellet entrance, reducibility gas entrance and fragmentation pelletizing, acid pellet entrance is connected with the acid pellet outlet of oxidizing roasting device；Cooling device, is exported provided with fragmentation pelletizing entrance and efflorescence material, and fragmentation pelletizing entrance is connected with the fragmentation pelletizing outlet of reduction roasting device；Concentration equipment, provided with efflorescence material entrance, magnetic powder outlet and namagnetic substance outlet, efflorescence material entrance is connected with the efflorescence material outlet of cooling device.The Iron grade of obtained magnetic powder is high.

Description

Comprehensively utilize the system and method for Industrial Solid Waste
Technical field
The invention belongs to field of metallurgy, and in particular to the system and method for comprehensive utilization Industrial Solid Waste.
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, It is main with fayalite (2FeOSiO2) form presence, also have a small amount of with magnetic iron ore (Fe3O4) form presence.Due to iron olive 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 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 processing it is difficult the problem of, the present invention by nonferrous metallurgy slag, red mud and carbide slag according to a certain percentage Pelletizing is mixed and made into, is calcined in an oxidizing atmosphere first, is then calcined, needs not move through broken under weak reducing atmosphere Device, direct magnetic separation is that can obtain Armco magnetic iron product, and technique is simple, and cost is low.
A kind of system for comprehensive utilization Industrial Solid Waste that the present invention is provided, including：
Mixing arrangement, provided with the outlet of nonferrous metallurgy slag entrance, red mud entrance, carbide slag entrance and compound；
Shaped device, is exported, the mixing of the compound entrance and the mixing arrangement provided with compound entrance and pelletizing Material outlet is connected；
Oxidizing roasting device, provided with pelletizing entrance, oxidizing gas entrance and acid pellet outlet, the pelletizing entrance with The pelletizing outlet of the shaped device is connected；
Reduction roasting device, provided with the outlet of acid pellet entrance, reducibility gas entrance and fragmentation pelletizing, the oxidation ball Group's entrance is connected with the acid pellet outlet of the oxidizing roasting device；
Cooling device, is exported provided with fragmentation pelletizing entrance and efflorescence material, the fragmentation pelletizing entrance and the reduction roasting The fragmentation pelletizing outlet of device is connected；
Concentration equipment, provided with efflorescence material entrance, magnetic powder outlet and namagnetic substance outlet, the efflorescence material entrance with The efflorescence material outlet of the cooling device is connected.
Preferably, said system also includes：
First breaker, provided with feed(raw material)inlet and powder outlet, the powder outlet is coloured with the 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 the 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 the mixing arrangement 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 and reach suitable particle size and moisture；
The nonferrous metallurgy slag, the red mud and the carbide slag are sent into the mixing arrangement and are well mixed, is obtained Compound；
The compound is sent into shaping is prepared in the shaped device, obtain pelletizing；
The pelletizing is sent into the oxidizing roasting device, is calcined in oxidizing atmosphere, acid pellet is obtained；
The acid pellet is sent into the reduction roasting device, is calcined under weakly reducing atmosphere, the oxidation Pelletizing produces swelling fracture while reduction, obtains fragmentation pelletizing；
The fragmentation pelletizing is sent into the cooling device and cooled down, the fragmentation pelletizing enters one in cooling procedure Efflorescence is walked, efflorescence material is obtained；
The efflorescence material is sent into magnetic separation is carried out in the concentration equipment, obtain magnetic powder.
Preferably, the calcium oxide (CaO) in the carbide slag respectively with the sulphur (S) and titanium dioxide in the nonferrous metallurgy slag Silicon (SiO2) reaction, and the calcium oxide of the reaction of Salmon-Saxl and the mol ratio of the sulphur are (2-5)：1, and the pasc reaction oxidation The mol ratio of calcium and the silica is (2.5-3)：1.
Preferably, the mass ratio of the red mud and the carbide slag is (3-6)：10.
Preferably, sintering temperature of the pelletizing in the oxidizing roasting device is 800 DEG C -1200 DEG C.
Preferably, sintering temperature of the acid pellet in the reduction roasting device is 600 DEG C -1000 DEG C.
Preferably, oxygen (O in the oxidizing atmosphere2) volumn concentration >=20%.
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, sodium oxide molybdena (Na in the red mud2) and potassium oxide (K O2O weight/mass percentage composition sum >=3%), dioxy Change titanium (TiO2) weight/mass percentage composition >=1.7%.
Preferably, in the carbide slag CaO weight/mass percentage composition >=56%.
Raw material in the present invention is the solid waste product of a variety of industries, can reach without adding other materials and proposes iron desulfurization Effect, by comprehensive utilization can solve the problem of storing up, be conducive to improve environment.
The Iron grade of magnetic powder produced by the present invention is more than 70%, and sulfur content can as little as 0.007%.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in comprehensive utilization Industrial Solid Waste system structural representation；
Fig. 2 prepares the process chart of magnetic powder for a kind of comprehensive utilization Industrial Solid Waste 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, red mud and carbide slag according to a certain percentage in the present invention.First will Pelletizing carries out roasting a period of time in an oxidizing atmosphere, continues to be calcined under weak reducing atmosphere, promotes pelletizing reducing A certain degree of swelling fracture occurs in journey, chipping pelletizing is finally placed into cooling a period of time in atmosphere, accelerated The efflorescence of material, magnetic separation is directly carried out by efflorescence material, can obtain final products.By above-mentioned steps, broken step is needed not move through Suddenly directly magnetic separation magnetic iron product can be obtained.
As shown in figure 1, the comprehensive utilization Industrial Solid Waste (metallurgical slag, red mud and carbide slag) that the present invention is provided prepares Armco magnetic iron The system of powder includes：First breaker 1, drying unit 2, the second breaker 3, mixing arrangement 4, shaped device 5, oxidation roasting Burn device 6, reduction roasting device 7, cooling device 8 and concentration equipment 9.
First breaker 1 is used for nonferrous metallurgy slag pulverizing and jevigating to appropriate particle size, in order to subsequent forming.First breaks Crushing device 1 is provided with feed(raw material)inlet and powder outlet.Said system can not also include the first breaker 1, directly using suitable The metallurgical slag of particle diameter.
Drying unit 2 is used to dry red mud raw material.Drying unit 2 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 2.
Second breaker 3 is used for carbide slag pulverizing and jevigating to appropriate particle size, in order to subsequent forming.Second broken dress Put 3 and be provided with feed(raw material)inlet and powder outlet.Said system can not also include the second breaker 3, directly using appropriate particle size Carbide slag.
Mixing arrangement 4 is used to the metallurgical slag, red mud and carbide slag of appropriate particle size and moisture being well mixed.Mixing arrangement 4 Provided with the outlet of metallurgical slag entrance, red mud entrance, carbide slag entrance and compound, the powder of metallurgical slag entrance and the first breaker 1 Material outlet is connected, and red mud entrance is connected with the drying material outlet of drying unit 2, the powder of carbide slag entrance and the second breaker 3 Material outlet is connected.
Shaped device 5 is used to compound being prepared into pelletizing.Shaped device 5 is exported provided with compound entrance and pelletizing, is mixed Material entrance is closed with the compound outlet of mixing arrangement 4 to be connected.
Oxidizing roasting device 6 is used to carry out agglomerates in oxidizing atmosphere.Oxidizing roasting device 6 enters provided with pelletizing Mouth, oxidizing gas entrance and acid pellet outlet, pelletizing entrance are connected with the pelletizing outlet of shaped device 5.
Reduction roasting device 7 is used under weakly reducing atmosphere carry out roasting oxidation pelletizing.Reduction roasting device 7 is provided with oxidation Pelletizing entrance, reducibility gas entrance and the outlet of fragmentation pelletizing, the acid pellet of acid pellet entrance and oxidizing roasting device 6 go out Mouth is connected；
Cooling device 8 is used to cool down fragmentation pelletizing, and the further efflorescence in cooling device 8 of fragmentation pelletizing obtains efflorescence material. Cooling device 8 is exported provided with fragmentation pelletizing entrance and efflorescence material, and the fragmentation pelletizing of fragmentation pelletizing entrance and reduction roasting device 7 goes out Mouth is connected.
Concentration equipment 9 is used for magnetic separation and obtains magnetic powder.Concentration equipment 9 provided with efflorescence material entrance, magnetic powder outlet and Namagnetic substance is exported, and efflorescence material entrance is connected with the efflorescence material outlet of cooling device 8.
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：
Prepare metallurgical slag, red mud and carbide slag；
Metallurgical slag, red mud and carbide slag are sent into mixing arrangement 4 and are well mixed, compound is obtained；
Feed the mixture into and shaping is prepared in shaped device 5, obtain pelletizing；
By in pelletizing feeding oxidizing roasting device 6, it is calcined in oxidizing atmosphere, obtains acid pellet；
Acid pellet is sent into reduction roasting device 7, is calcined under weakly reducing atmosphere, acid pellet is in reduction Swelling fracture is produced simultaneously, obtains fragmentation pelletizing；
Fragmentation pelletizing is sent into cooling device 8 and cooled down, the further efflorescence in cooling procedure of fragmentation pelletizing is obtained Efflorescence material；
Efflorescence material is sent into magnetic separation is carried out in concentration equipment 9, obtain magnetic powder.
Above-mentioned nonferrous metallurgy slag refers to the product obtained during pyrometallurgical smelting non-ferrous metal (such as copper, nickel), wherein iron it is main with Fayalite (2FeOSiO2) form presence, also a small amount of magnetic iron ore (Fe3O4).It is metallurgical in the preferred embodiment of the invention Weight/mass percentage composition >=40% of iron in slag.If the iron content in metallurgical slag is relatively low, the production of final products Armco magnetic iron can be reduced Amount, influences economic benefit；Simultaneously during follow-up week reduction gas roast, the bloodstone (Fe of fayalite generation2O3) It is reduced into magnetic iron ore (Fe3O4) during, rupture and the powder of pelletizing can be caused using the property of its unit cell volume abnormal expansion Change, if the iron content in nonferrous metallurgy slag is relatively low, be unable to reach the effect
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, Na in red mud2O and K2O weight/mass percentage composition sum >=3%, TiO2Weight/mass percentage composition >=1.7%.This is due to that the alkali metal such as K and Na can be embedded in bloodstone in reducing roasting process In, increase the lattice defect number of bloodstone, promote it that abnormal expansion and rupture occur when being reduced into magnetic iron ore, if content mistake It is low, it is impossible to reach the effect；TiO2Presence can also promote the generation of powder phenomenon-tion, if content is too low, it is impossible to ensure that pelletizing fills Divide efflorescence, 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.
Sulfur content of the consumption of carbide slag in nonferrous metallurgy slag and the SiO in nonferrous metallurgy slag2Content is determined, electric A CaO parts in rock ballast react with the S in nonferrous metallurgy slag, and wherein CaO and S mol ratio are (2-5)：1；Another portion Divide and SiO2React, wherein CaO and SiO2Mol ratio be (2.5-3)：1.If carbide slag consumption is very few, it is impossible to will be coloured The sulphur volatilized in metallurgical slag is completely fixed, also can not be with SiO2Fully reaction, influences the efflorescence effect in follow-up cooling procedure； If carbide slag consumption is excessive, pelletizing particle diameter can be increased, heat is have impact on to transmission inside pelletizing.
In the preferred embodiment of the invention, the mass ratio of red mud and carbide slag is (3-6)：10.Due to the bonding of red mud Property it is stronger, without in blending process add binding agent can balling-up；The bloodstone in red mud is roasted in weak reducing atmosphere simultaneously Magnetic iron ore can be changed into during burning to occur volumetric expansion, promote pelletizing rupture efflorescence, without extra increase separator Direct magnetic separation can obtain magnetic iron product.
In the present invention, the calcination atmosphere of oxidizing roasting is the oxidizing atmosphere containing certain oxygen, wherein O2Volume hundred Divide than content >=20%.Sulphur in nonferrous metallurgy slag generates SO with oxygen2, and reacted life with the calcareous material in carbide slag Into solid matter, the purpose of solid sulphur is reached.Fe in red mud2O3SO can be catalyzed2It is changed into SO3, reduce the reunion of desulfurization product Property.Meanwhile, under this atmosphere, the fayalite in nonferrous metallurgy slag can be changed into bloodstone (Fe2O3)。
In the preferred embodiment of the invention, sintering temperature of the pelletizing in oxidizing roasting device 6 is 800 DEG C -1200 DEG C. The temperature of oxidizing roasting is more than 800 DEG C, and the fayalite in nonferrous metallurgy slag can just react with oxygen generates Fe2O3；If The low melting point that temperature is higher than in 1200 DEG C, nonferrous metallurgy slag can occur fusing and bond, and not only influence pellet strength, can also shadow Ring SO2Gas outer layers spread, and reduce desulfurized effect.At this temperature, roasting time preferably is 15min-30min, if Roasting time is too short, and the fayalite in nonferrous metallurgy slag does not react fully, and influence subsequently generates magnetic in reducing atmosphere The effect of iron；It is the waste to the energy if roasting time is long.
Meanwhile, under this roasting condition, the SiO in CaO and metallurgical slag in carbide slag2Reaction generation dicalcium silicate (β- C2S), crystal transition can occur in follow-up cooling procedure for such a material.
In reducing roasting process, the crystalline substance of bloodstone can be increased in pelletizing containing many kinds of substance in red mud and carbide slag Born of the same parents, and promote bloodstone to occur distortion of lattice.In carbide slag and red mud alkali metal (Na, K etc.) and alkaline-earth metal (Ca, Mg etc.) it is embedded in bloodstone, add lattice defect number.The distribution of lattice defect and various components be it is irregular, it is this It is irregular to determine that diffusion coefficient of each component in reduction is different in hematite crystals.The bloodstone that structure cell increase is distorted When reverting to magnetic iron ore, it is many that volume increases, and the stress of generation is also big, therefore causes abnormal expansion and the efflorescence of pelletizing.In addition, by Contain a certain amount of TiO in red mud2, the phase transition temperature that bloodstone is converted to magnetic iron ore can be reduced, while the glass phase of generation Toughness value is very low, is the fragile ore deposit phase of comparison, when unit cell volume increases, and the stress increase of surrounding, glass mutually easily occurs disconnected Split, therefore promote the generation of powder phenomenon-tion.
Meanwhile, the Fe in pelletizing2O3Also can occur reduction reaction, due to being calcined under weakly reducing atmosphere, therefore only can Reduction generation Fe3O4(ferromagnetism) rather than FeO (nonmagnetic), due to Fe3O4With ferromagnetism, during later separation magnetic separation Easily sorted, improve the organic efficiency of iron.
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 if CO too high levels, the reproducibility of gas is too strong2O3FeO is restored to, FeO is nonmagnetics Matter, it is impossible to separated in subsequent process with gangue material；If O2Too high levels, it is impossible to promote the bloodstone in pelletizing to occur also Original reaction generation magnetic iron ore, does not reach the purpose of the present invention.
In the preferred embodiment of the invention, sintering temperature of the acid pellet in reduction roasting device 7 be 600 DEG C- 1000℃.If sintering temperature is too low, it is impossible to promote bloodstone to change to magnetic iron ore, the mesh that pelletizing expands efflorescence is not reached 's；If sintering temperature is too high, the fusing of pelletizing can be caused.
The pelletizing for having expansion efflorescence to a certain degree after reduction is cooled down in atmosphere, the silicon generated in early stage roasting process Crystal transition can occur for sour dicalcium, in the steady β-C that are situated between2S generates the γ-C of stable state2S, crystalline phase conversion can cause volume swollen It is swollen, so as to aggravate the efflorescence of material.
The invention comprehensively utilizes various industrial waste residues, the Iron grade of obtained magnetic powder is high, is used directly for refining Iron.
Raw material in the present invention is the solid waste product of a variety of industries, can reach without adding other materials and proposes iron desulfurization Effect, by comprehensive utilization can solve the problem of storing up, be conducive to improve environment.
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 40.47%, sulfur content 0.24%；Red mud Fe2O3Content 35.33%, Na2O content 2.75%, K2O content 0.62%, TiO2Content 1.74%；The CaO content of carbide slag is 59.77%, content of MgO 0.04%, K2O content 0.07%, Na2O content 0.05%, TiO2Content 0.08%.
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 Drying to water content is 8%.Three kinds of materials are well mixed according to a certain percentage pelletizing is made, wherein, the consumption root of carbide slag According to the SiO in the sulfur content in nonferrous metallurgy slag and nonferrous metallurgy slag2Content determines that the CaO parts in carbide slag are with having S in color metallurgical slag reacts, and wherein CaO and S mol ratio are 2:1；Another part and SiO2React, wherein CaO With SiO2Mol ratio be 3:1.In addition, the weight ratio of red mud and carbide slag is 30:100.
Secondly, pelletizing is calcined in air atmosphere, sintering temperature is 800 DEG C, and roasting time is 30min, obtained 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, the Fe in roasting process in pelletizing2O3It is reduced into Fe3O4, while pelletizing generation is a certain degree of swollen Swollen efflorescence, obtains the fragmentation pelletizing of reduction.
Then, by cooling and standings 30min, the efflorescence of aggravation pelletizing in atmosphere of fragmentation pelletizing, efflorescence material is obtained.
Finally, efflorescence material is subjected to magnetic separation, final products are magnetic powder.Its Iron grade is 70.82%, and sulfur content is 0.021%.
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 42.08%, sulfur content 0.68%；Red mud Fe2O3Content 38.28%, Na2O content 4.85%, K2O content 0.24%, TiO2Content 2.11%；The CaO content of carbide slag For 60.01%, content of MgO 0.09%, K2O content 0.05%, Na2O content 0.02%, TiO2Content 0.04%.
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 to water content is 10%.Three kinds of materials are well mixed according to a certain percentage pelletizing is made, wherein, the use of carbide slag Measure the sulfur content in nonferrous metallurgy slag and the SiO in metallurgical slag2A CaO parts and smelting in content determination, carbide slag S in golden slag reacts, and wherein CaO and S mol ratio are 3:1；Another part and SiO2React, wherein CaO and SiO2 Mol ratio be 2.7:1.In addition, the weight ratio of red mud and carbide slag is 45:100.
Secondly, pelletizing is calcined in the atmosphere of oxygen content 25%, 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, the Fe in roasting process in pelletizing2O3It is reduced into Fe3O4, while pelletizing generation is a certain degree of swollen Swollen efflorescence, obtains the fragmentation pelletizing of reduction.
Then, by cooling and standings 40min, the efflorescence of aggravation pelletizing in atmosphere of fragmentation pelletizing, efflorescence material is obtained.
Finally, efflorescence material is subjected to magnetic separation, final products are magnetic powder.Its Iron grade is 71.94%, and sulfur content is 0.007%.
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 43.21%, sulfur content 0.90%；Red mud Fe2O3Content 37.51%, Na2O content 4.11%, K2O content 0.37%, TiO2Content 2.75%；The CaO content of carbide slag is 57.42%, content of MgO 1.45%, K2O content 0.04%, Na2O content 0.02%, TiO2Content 0.06%.
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 to water content is 5%.Three kinds of materials are well mixed according to a certain percentage pelletizing is made, wherein, the use of carbide slag Measure the sulfur content in nonferrous metallurgy slag and the SiO in nonferrous metallurgy slag2Content determines that the CaO in carbide slag is a part of Reacted with the S in nonferrous metallurgy slag, wherein CaO and S mol ratio are 5:1；Another part and SiO2React, wherein CaO and SiO2Mol ratio be 2.5:1.In addition, the weight ratio of red mud and carbide slag is 60:100.
Secondly, pelletizing is calcined in oxygen content for 23% atmosphere, sintering temperature is 1200 DEG C, during roasting Between be 15min, obtain 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, the Fe in roasting process in pelletizing2O3It is reduced into Fe3O4, while pelletizing expands efflorescence, obtain Obtain the reducting pellet of fragmentation.
Then, by cooling and standings 60min, the efflorescence of aggravation pelletizing in atmosphere of fragmentation pelletizing, efflorescence material is obtained.
Finally, efflorescence material is subjected to magnetic separation, final products are magnetic powder.Its Iron grade is 72.21%, and sulfur content is 0.014%.
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.
In addition, the present invention need not add other materials, the effect for extracting iron desulfurization can be reached, obtained magnetic product can 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. comprehensively utilize the system of Industrial Solid Waste, it is characterised in that including：
Mixing arrangement, provided with the outlet of nonferrous metallurgy slag entrance, red mud entrance, carbide slag entrance and compound；
Shaped device, is exported, the compound of the compound entrance and the mixing arrangement goes out provided with compound entrance and pelletizing Mouth is connected；
Oxidizing roasting device, provided with pelletizing entrance, oxidizing gas entrance and acid pellet outlet, the pelletizing entrance with it is described The pelletizing outlet of shaped device is connected；
Reduction roasting device, provided with the outlet of acid pellet entrance, reducibility gas entrance and fragmentation pelletizing, the acid pellet enters Mouth is connected with the acid pellet outlet of the oxidizing roasting device；
Cooling device, is exported provided with fragmentation pelletizing entrance and efflorescence material, the fragmentation pelletizing entrance and the reduction roasting device Fragmentation pelletizing outlet be connected；
Concentration equipment, provided with efflorescence material entrance, magnetic powder outlet and namagnetic substance outlet, the efflorescence material entrance with it is described The efflorescence material outlet of cooling device is connected.
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 nonferrous metallurgy of the powder outlet and the mixing arrangement Slag entrance is connected；
Second breaker, provided with feed(raw material)inlet and powder outlet, the carbide slag of the powder outlet and the mixing arrangement enters Mouth is connected；
Drying unit, is exported provided with feed(raw material)inlet and drying material, the drying material outlet and the red mud entrance of the mixing arrangement It is connected.
3. the method that the system described in a kind of utilization claim 1 or 2 prepares magnetic powder, it is characterised in that including following step Suddenly：
Prepare coloured metallurgical slag, red mud and carbide slag；
The nonferrous metallurgy slag, the red mud and the carbide slag are sent into the mixing arrangement and are well mixed, is mixed Material；
The compound is sent into shaping is prepared in the shaped device, obtain pelletizing；
The pelletizing is sent into the oxidizing roasting device, is calcined in oxidizing atmosphere, acid pellet is obtained；
The acid pellet is sent into the reduction roasting device, is calcined under weakly reducing atmosphere, the acid pellet Swelling fracture is produced while reduction, fragmentation pelletizing is obtained；
The fragmentation pelletizing is sent into the cooling device and cooled down, the fragmentation pelletizing further powder in cooling procedure Change, obtain efflorescence material；
The efflorescence material is sent into magnetic separation is carried out in the concentration equipment, obtain magnetic powder.
4. method according to claim 3, it is characterised in that calcium oxide in the carbide slag respectively with the coloured smelting Sulphur and silicon dioxde reaction in golden slag, and the calcium oxide of the reaction of Salmon-Saxl and the mol ratio of the sulphur are (2-5)：1, and it is described The mol ratio of the calcium oxide of silicon dioxde reaction and the silica is (2.5-3)：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 temperature of the pelletizing in the oxidizing roasting device Spend for 800 DEG C -1200 DEG C.
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 volume percent content of oxygen in the oxidizing atmosphere >=20%；The volumn concentration of carbon monoxide is 2000ppm-5000ppm, the volume basis of oxygen in the weakly reducing atmosphere Content is 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 quality percentage of sodium oxide molybdena and potassium oxide in the red mud Content sum >=3%, weight/mass percentage composition >=1.7% of titanium dioxide；The weight/mass percentage composition of calcium oxide in the carbide slag >=56%.
CN201710349526.4A 2017-05-17 2017-05-17 Comprehensively utilize the system and method for Industrial Solid Waste Pending CN107099657A (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN104451016A (en) * 2014-11-25 2015-03-25 北京神雾环境能源科技集团股份有限公司 Method for separating metal iron from phosphorus containing iron ore
CN105907944A (en) * 2016-04-27 2016-08-31 江苏省冶金设计院有限公司 Method and system for treating metallurgical slag
CN106222347A (en) * 2016-08-01 2016-12-14 江苏省冶金设计院有限公司 From the method and system of recovering iron from red mud
CN206828587U (en) * 2017-05-17 2018-01-02 江苏省冶金设计院有限公司 The system for comprehensively utilizing Industrial Solid Waste

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104451016A (en) * 2014-11-25 2015-03-25 北京神雾环境能源科技集团股份有限公司 Method for separating metal iron from phosphorus containing iron ore
CN105907944A (en) * 2016-04-27 2016-08-31 江苏省冶金设计院有限公司 Method and system for treating metallurgical slag
CN106222347A (en) * 2016-08-01 2016-12-14 江苏省冶金设计院有限公司 From the method and system of recovering iron from red mud
CN206828587U (en) * 2017-05-17 2018-01-02 江苏省冶金设计院有限公司 The system for comprehensively utilizing Industrial Solid Waste

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