CN111647739A - Utilization method of iron-containing resource - Google Patents

Utilization method of iron-containing resource Download PDF

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Publication number
CN111647739A
CN111647739A CN202010552902.1A CN202010552902A CN111647739A CN 111647739 A CN111647739 A CN 111647739A CN 202010552902 A CN202010552902 A CN 202010552902A CN 111647739 A CN111647739 A CN 111647739A
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iron
sintering
ore
resource
sintered
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CN111647739B (en
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王禹键
饶家庭
蒋胜
胡鹏
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • 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
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention provides a utilization method of iron-containing resources, which comprises the following steps: screening the iron-containing resources to obtain the iron-containing resources with the size fraction of-10 mm and the iron-containing resources with the size fraction of +10 mm; crushing and grinding the iron-containing resource with the grain size of-10 mm to obtain powder with the grain size less than 0.5 mm; mixing the powder and bentonite, and then performing pressure forming to prepare a material with the granularity of more than 10 mm; and mixing the iron-containing resource with the grain size of +10mm and the material with the grain size of more than 10mm to obtain the sintering bedding material for preparing the sintering ore. The invention carries out pelletizing or agglomeration on the part of-10 mm after crushing and grinding the secondary resource containing iron with different granularity, the part of +10mm is directly used as a bedding material for replacing sintering, and then the part of +10mm is put into a furnace together with sintering mineral aggregate, and the secondary resource containing iron is utilized by replacing the sintering bedding material.

Description

Utilization method of iron-containing resource
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a utilization method of iron-containing resources.
Background
The utilization of iron-containing secondary resources has been a very concern in the metallurgical industry for a long time, and the metallurgical iron-containing resources such as furnace iron tank fly ash, gravity fly ash, cloth bag fly ash and the like are effectively utilized, so that the pig iron cost can be reduced, and the harm of the dust to the environment can be solved. At present, the common method for the metallurgical iron-containing materials at home and abroad is to directly blend artificial lump ore into a blast furnace or blend fine-grained secondary resources into sinter ore so as to achieve the purpose of resource recycling; however, this method of utilization has problems in that: (1) directly performing agglomeration and feeding into a furnace, wherein if the agglomeration is firstly performed and the feeding is performed, the utilization cost is high, if the cold-pressing agglomeration is performed and the feeding is performed, the thermal strength cannot be ensured, and the agglomeration is seriously performed after the feeding; (2) the fine-grained secondary resources are added into the sintering, so that the iron grade of the sintered ore is reduced, the granulation effect is reduced, and the sintering quality is seriously influenced.
Disclosure of Invention
In view of the above, the present invention provides a method for utilizing iron-containing resources, which is capable of utilizing iron-containing resources with low cost, high efficiency and environmental protection.
The invention provides a utilization method of iron-containing resources, which comprises the following steps:
screening the iron-containing resources to obtain the iron-containing resources with the size fraction of-10 mm and the iron-containing resources with the size fraction of +10 mm;
crushing and grinding the iron-containing resource with the grain size of-10 mm to obtain powder with the grain size less than 0.5 mm;
mixing the powder and bentonite, and then performing pressure forming to prepare a material with the granularity of more than 10 mm;
and mixing the iron-containing resource with the grain size of +10mm and the material with the grain size of more than 10mm to obtain the sintering bedding material for preparing the sintering ore.
The invention has no special limitation on the iron-containing resources, and the iron-containing resources generated in the steelmaking process, such as furnace iron tank fly ash, gravity fly ash, cloth bag fly ash and the like, which are well known to the technical personnel in the field can be adopted; the iron-containing resource preferably comprises TFe, FeO and SiO2、CaO、MgO、Al2O3、V2O5、TiO2S, P and other ingredients; the TFe refers to the total amount of iron and iron oxide in the raw material, and the mass content of the TFe in the iron-containing resource is preferably 34-52%, more preferably 35-50%, and most preferably 40-45%; the FeO is in a ferrous materialThe mass content of the source is preferably 6-10%, and more preferably 7-8%; the SiO2The mass content of the iron-containing resources is preferably 6-7%, and more preferably 6.5%; the mass content of the CaO in the iron-containing resource is preferably 4-7%, and more preferably 5-6%; the mass content of the MgO in the iron-containing resource is preferably 0-3%, more preferably 0.5-2.5%, and most preferably 1-2%; the Al is2O3The mass content of the iron-containing resources is preferably 0-3%, more preferably 0.5-2.5%, and most preferably 1-2%; the V is2O5The mass content of the iron-containing resources is preferably 0.1-0.2%, and more preferably 0.15%; the TiO is2The mass content of the iron-containing resource is preferably 0-4.5%, more preferably 0.5-4%, more preferably 1-3.5%, more preferably 1.5-3%, and most preferably 2-2.5%; the mass content of S in the iron-containing resource is preferably 0.15-0.25%, and more preferably 0.2%; the mass content of the P in the iron-containing resource is preferably 0.03-0.04%; the other components are low-level and harmful elements, such as K2O、Na2O, ZnO, CuO and the like, and the mass content of the other components in the iron-containing resource is preferably 9-26%, and more preferably 15-20%.
In the invention, the iron-containing resource with the size fraction of +10mm refers to oversize products obtained by screening a sieve with the iron-containing resource in the size fraction of 10 mm; the iron-containing resource of-10 mm size fraction refers to undersize obtained by sieving the iron-containing resource on a sieve of 10mm size fraction.
In the invention, the granularity of the powder is preferably 0.074-20 mm, more preferably 0.01-15 mm, more preferably 0.1-10 mm, more preferably 1-5 mm, and most preferably 2-3 mm. In the present invention, the mass content of TFe in the powder is preferably 20 to 30%, more preferably 25%.
In the present invention, the bentonite preferably comprises SiO2、CaO、MgO、Al2O3And other ingredients; the SiO2The mass content of the bentonite is preferably 59-61%, and more preferably 60%; the mass content of CaO in the bentonite is preferably 2-4%, and more preferably 3%; the mass content of MgO in bentonite is preferably3-5%, more preferably 4%; the Al is2O3The mass content of the bentonite is preferably 11-13%, and more preferably 12%; the other component is a low-level component such as K2O、Na2O, and the like, and the mass content of the other components in the bentonite is preferably 21-23%, more preferably 22%.
In the invention, the colloid value of the bentonite is preferably 24-25 mlg-1More preferably 24.5mlg-1(ii) a The swelling time of the bentonite is preferably 18-20 mlg-1More preferably 19mlg-1(ii) a The preferable blue absorption amount of the bentonite is 36-38 g (100g)-1More preferably 37g (100g)-1。
In the invention, the amount of the bentonite is preferably 2-4% of the mass of the powder, and more preferably 3%.
In the present invention, the pressure for the press molding is preferably 50 to 100KN, more preferably 60 to 90KN, and most preferably 70 to 80 KN.
In the present invention, the shape of the material with the grain size of more than 10mm is preferably spherical or block; the granularity of the material with the granularity larger than 10mm is preferably 10-20 mm, and more preferably 15 mm; the drum index of the material with the granularity of more than 10mm is preferably more than or equal to 70 percent, and more preferably 72-84 percent.
In the present invention, the components of the material with a particle size > 10mm preferably comprise: TFe, CaO, SiO2And MgO; the mass content of the TFe in the material with the granularity larger than 10mm is preferably 42-43%; the mass content of CaO in the material with the granularity of more than 10mm is preferably 3-4%, and more preferably 3.5-3.6%; the SiO2The mass content of the material with the granularity of more than 10mm is preferably 6.5-8%, and more preferably 7.2-7.6%; the mass content of MgO in the material with the granularity of more than 10mm is preferably 2-3%, and more preferably 2.5-2.6%.
In the invention, preferably, the iron-containing resource with the grain size of +10mm and the material with the grain size of more than 10mm are mixed and then spread on a grate bar of a sintering machine to be used as a sintering bedding material; the thickness of the sintering bedding material is preferably 3-5% of the total thickness of the sintering material layer (comprising the bedding material layer and the sintering mineral material layer), more preferably 3.5-4.5%, and most preferably 4%; the total thickness of the sintering material layer is preferably 650-750 mm, more preferably 680-720 mm, and most preferably 700 mm; the thickness of the sintering bedding material is preferably 20-35 mm, and more preferably 25-30 mm.
The method for preparing the sintered ore is not particularly limited, and the common bedding materials used for preparing the sintered ore are replaced by the sintering bedding materials prepared from the iron-containing resources by adopting the method for preparing the sintered ore, which is well known to the technical personnel in the field. In the present invention, the sintering raw material used in the process of preparing the sintered ore preferably includes: iron ore concentrate, high-grade fine ore, medium-grade fine ore, alkaline flux and fuel; the grade of the iron ore concentrate is preferably 50-60%, more preferably 52-58%, and most preferably 54-56%; the mass content of the iron ore concentrate in the sintering raw material is preferably 50-55%, and more preferably 52-53%; the grade of the high-grade fine ore is preferably 55-65%, more preferably 58-62%, and most preferably 60%; the mass content of the high-grade fine ore in the sintering raw material is preferably 15-20%, and more preferably 17-18%; the grade of the medium-grade fine ore is preferably 40-45%, and more preferably 42-43%; the mass content of the medium-grade fine ore in the sintering raw material is preferably 5-15%, and more preferably 10%; the alkaline flux is preferably selected from one or two of active lime and quicklime; the mass content of the alkaline flux in the sintering raw material is preferably 13-16%, and more preferably 14-15%; the fuel is preferably selected from one or two of coal powder and coke powder; the mass content of the fuel in the sintering raw material is preferably 4-5%. In the invention, because the sintering bedding material prepared from iron-containing resources is adopted, the fuel consumption in the process of preparing the sintering ore is preferably increased by 20-30% compared with that of the common bedding material, and more preferably increased by 25%, namely the fuel consumption of the sintering raw materials is increased by 20-30%.
In the invention, the ignition temperature in the process of preparing the sinter is preferably 1100-1200 ℃, more preferably 1130-1170 ℃, and most preferably 1150 ℃; the speed of the trolley is preferably 1.5-2.5 m/h, more preferably 1.8-2.2 m/h, and most preferably 2 m/h; the sintering negative pressure is preferably 10 to 20KPa, more preferably 13 to 17KPa, and most preferably 15 KPa.
In the present invention, the method for utilizing iron-containing resources preferably further comprises:
and mixing the sinter and the sintered bedding material sintered in the process of preparing the sinter, and performing blast furnace smelting as the sinter burden for blast furnace smelting.
The source of the sintered ore is not particularly limited in the present invention, and sintered ore known to those skilled in the art may be used, or sintered ore obtained after preparing sintered ore as described above may be used. In the present invention, the composition of the sintered ore preferably includes: TFe, FeO, SiO2CaO, MgO, and S; the mass content of the TFe in the sintered ore is 49.5-50%, and the more preferable content is 49.7%; the mass content of the FeO in the sintered ore is preferably 7.3-7.7%, and more preferably 7.5%; the SiO2The mass content in the sintered ore is preferably 5.5-6%, and more preferably 5.7%; the mass content of CaO in the sintered ore is preferably 10.3-10.8%, and more preferably 10.5%; the mass content of MgO in the sintering furnace is preferably 3-3.5%, and more preferably 3.2%; the mass content of S in the sintered ore is preferably 0.02-0.025%, and more preferably 0.021%.
In the present invention, the composition of the sinter ore charge preferably includes: TFe, FeO, SiO2CaO, MgO, and S; the mass content of the TFe in the sintered ore is 48.2-49.2%, and more preferably 49.0%; the mass content of the FeO in the sintered ore is preferably 7.0-7.5%, and more preferably 7.3%; the SiO2The mass content in the sintered ore is preferably 5.5-6%, and more preferably 5.7%; the mass content of CaO in the sintered ore is preferably 10.3-10.8%, and more preferably 10.5%; the mass content of MgO in the sintered ore is preferably 3-3.5%, and more preferably 3.3%; the mass content of S in the sintered ore is preferably 0.025-0.03%, and more preferably 0.028%.
In the present invention, the mass of the sintered bed charge after sintering is preferably 1.5 to 2.5%, more preferably 1.8 to 2.2%, and most preferably 2% of the mass of the sintered ore.
In the invention, the blast furnace burden adopted in the blast furnace smelting process preferably comprises the above sinter ore burden, pellet ore and lump ore; the mass ratio of the sintered ore furnace burden to the pellet ore to the lump ore is preferably (65-75): (20-30): (3-7), more preferably (68-72): (23-27): (4-6), and most preferably 70:25: 5.
In the present invention, the composition of the pellet preferably includes: TFe, FeO, SiO2CaO and MgO; the mass content of the TFe in the pellet is preferably 50-55%, and more preferably 53%; the mass content of the FeO in the pellet ore is preferably 1-3%, and more preferably 2%; the SiO2The mass content of the pellet ore is preferably 5-7%, and more preferably 6%; the mass content of CaO in the pellet ore is preferably 0.8-1%, and more preferably 0.9%; the mass content of MgO in the pellet ore is preferably 2.5-3%, and more preferably 2.8%.
In the present invention, the composition of the lump ore preferably includes: TFe, FeO, SiO2CaO and MgO; the mass content of the TFe in the lump ore is 35-40%, and more preferably 38%; the mass content of the FeO in the lump ore is preferably 1.7-2.2%, and more preferably 1.9%; the SiO2The mass content of the lump ore is preferably 24-25%, and more preferably 24.6%; the mass content of CaO in the lump ore is preferably 2-3%, and more preferably 2.5%; the mass content of MgO in the lump ore is preferably 1-2%, and more preferably 1.4%.
The specific method for blast furnace smelting is not particularly limited, and the technical scheme of blast furnace smelting known by the technical personnel in the field can be adopted.
The invention carries out pelletizing or agglomeration on the part of-10 mm after crushing and grinding the secondary resource containing iron with different granularity, the part of +10mm is directly used as a bedding material for replacing sintering, and then the part of +10mm is put into a furnace together with sintering mineral aggregate, and the secondary resource containing iron is utilized by replacing the sintering bedding material.
The method can utilize most of the existing iron-containing secondary resources with low cost, high efficiency and environmental protection, and has no requirement on the granularity of the resources. The invention carries out pelletizing or agglomeration on the part of-10 mm after crushing and grinding the secondary resources containing iron with different granularity, the part of-10 mm is used as a substitute for sintering bedding material, the part of +10mm is directly used as the bedding material, and the sintered secondary resources and finished sintered ore are mixed and put into a furnace for blast furnace smelting.
The utilization method of the iron-containing secondary resource provided by the invention has the following advantages: firstly, the iron-containing secondary resource has no requirement on the size fraction; secondly, the iron-containing secondary dust is processed into a sintering bed charge by pressure forming equipment, and the raw material is roasted by using the waste heat in the sintering process, so that the strength of the resource before the resource is put into the furnace is improved, and the adverse effect caused by the fact that the pulverization rate of the fuel and the furnace charge is increased when the resource is directly put into the furnace can be reduced; thirdly, sintering pretreatment is carried out on the resource, so that the amount of impurities and harmful elements in the resource can be reduced; fourthly, the yield of the sinter can be increased.
Generally, the sintering bed charge accounts for about 2-4% of the output of the sintering ore, taking a Xichang steel vanadium iron-making plant as an example, the sintering bed charge accounts for about 2.5% of the total material amount of the sintering ore, the annual pig iron yield is about 400 ten thousand tons, and the needed sintering ore is about 800 tons, and the bed charge is needed to be: 800 × 2.5% ═ 20 ten thousand tons; the iron-containing secondary resource agglomeration is used as a bottom material of the sinter, the processing cost does not exceed 100 yuan/ton, taking low-grade lump ore used by the vanadium of the West Chang steel as an example, the price of the lump ore with 25 percent of total iron is 200 yuan/ton, and if 20 ten thousand tons of lump ore are used each year, the total price is as follows: 20 (200-. The iron-containing secondary resources are various in types and large in quantity, serious in pollution to air and the surrounding environment, and if the resources can be continuously utilized at low cost, the environmental protection pressure of a steel plant can be effectively relieved.
In the invention, the blast furnace air permeability index is an important index for representing the air permeability in the blast furnace, and the higher the index is, the better the air permeability of the blast furnace is, and the same blast furnace has comparability.
In the invention, the sintering furnace-entering utilization coefficient refers to the ratio of the sintering ore amount directly entering the blast furnace in unit time to the total sintering ore amount, and the larger the ratio is, the more the sintering ore amount of the sintered finished product is.
Detailed Description
The compositions of the iron-containing resources used in the following examples of the present invention are shown in table 1:
TABLE 1 iron-containing resource Components in the examples of the present invention
Composition (I) TFe FeO SiO2 CaO MgO Al2O3 V2O5 TiO2 S P Ig Others
Iron-containing resource1 34.3 10.0 6.61 7.41 2.78 2.95 0.19 4.49 0.244 0.039 21.24 9.75
Iron-containing resource 2 52.00 6.20 7.00 4.00 0.10 0 0.17 0.03 5.0 25.60
The ingredients of the bentonite used in the examples of the present invention are shown in table 2:
TABLE 2 Bentonite composition used in the examples of the invention
Figure BDA0002543142540000061
The ingredients for preparing a material with a particle size > 10mm in the examples of the invention are shown in table 3:
TABLE 3 examples of the invention preparation of a Material blend (mass ratio of iron-containing resource 1 to bentonite) with a particle size > 10mm
Figure BDA0002543142540000062
Figure BDA0002543142540000071
The blast furnace burden components used in the comparative examples and examples of the present invention are shown in table 4:
TABLE 4 blast furnace burden composition used in comparative examples and examples of the present invention
Mine species TFe FeO SiO2 CaO MgO S
Sintered ore 49.7 7.5 5.7 10.5 3.2 0.021
Pellet ore 53.0 2.0 5.9 0.9 2.8
Lump ore 38.0 1.9 24.6 2.5 1.4
The blast furnace charge structures used in comparative example 1 and example of the present invention are shown in Table 5:
TABLE 5 blast furnace burden structures used in comparative example 1 and example
Sintered ore Sinter charge Pellet ore Lump ore
Comparative example 1 70 25 5
Examples 70 25 5
The formulation method of the bedding material and the fuel used in the comparative examples and examples of the present invention is shown in table 6: TABLE 6 formulation of bedding materials and fuels used in comparative examples and examples of the present invention
Figure BDA0002543142540000072
Figure BDA0002543142540000081
The compositions and tumbler indices for the preparation of a material having a particle size of > 10mm in the examples of the invention are shown in Table 7:
TABLE 7 composition and Drum index of the materials prepared in the examples of the invention with a particle size > 10mm
Species of TFe/％ CaO/％ SiO2/％ MgO/％ Tumbler index/%
Q1 cold-pressed ball 42.77 3.5 6.5 2.5 83.21
Q2 cold-pressed ball 42.44 3.6 7.2 2.5 77.86
Q3 cold-pressed ball 42.11 3.6 7.6 2.6 72.17
Comparative example 1
The sintering fuel and the bed charge are controlled according to the requirements in table 6, a common bed charge (small-sized sintered ore with the size of 10-12 mm) is flatly paved on a grate bar of a sintering machine, after the sintered materials (55 Wt% of iron ore concentrate (the grade is 56.5%), 20 Wt% of high-grade powder ore (the grade is 60%), 5 Wt% of medium-grade powder ore (the grade is 42%), 15 Wt% of quick lime and 5 Wt% of coke powder) are fully paved, ignition is carried out, the thickness of the sintered material layer is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintered ore is obtained after sintering, the components of the sintered ore are as shown in table 4, and the burden components and the charging are proportioned according to table 5 for smelting.
The utilization coefficient of the fired sinter (the fired amount of finished sinter produced in unit area of the sintering machine in unit time after being sieved), the permeability index in the furnace (the ratio of blast furnace air volume to pressure difference, the larger the value, the better the permeability), the fuel ratio consumption (the fuel quantity required by producing unit pig iron) and the S content (ISO9516-1992, wavelength dispersion X-ray fluorescence spectrometry for measuring silicon, calcium, manganese, aluminum, titanium, magnesium, phosphorus, sulfur and potassium in iron ore) are detected, and the detection result is as follows: the utilization coefficient of the charged sinter ore is 1.016t/m3.h-1In-furnace permeability index 1957m3.min-1.MPa-1The fuel ratio is 572kg/t, [ S ]]The content is 0.084%.
Example 1
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q1 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the parts with the resource content of +10mm are mixed and then are paved on a sintering machine grate bar, the thickness of the bedding material is controlled as shown in a table 6, the sintering material is paved (the same as the sintering material and the using amount in the comparative example 1, but the using amount of fuel is increased according to the table 6), ignition is carried out for sintering, the sintering thickness is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintering ore and the bedding material after sintering are obtained after the sintering is finished, the sintering ore and the bedding material after sintering are mixed to obtain the burden of the sintering ore (the mass of the bedding material after sintering is 2 percent of the mass of the sintering ore), and the burden components and the proportion in the table 5 are smelted.
Example 1 was tested according to the method of comparative example 1: cold-pressed pellet rotary drum index 83.21% (GB8209-87 method for measuring drum strength of sinter and pellet), and fired sinter utilization coefficient 1.084t/m3.h-1In-furnace permeability index of 2098m3.min-1.Mpa-1The fuel ratio consumption is 566kg/t, [ S ]]The content is 0.075%.
Example 2
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q1 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron content of +10mm are mixed and then are paved on a sintering machine grate bar, the thickness of a bedding material is controlled as shown in table 6, sintering materials are paved (the sintering materials and the usage amount are the same as those in comparative example 1, the fuel usage amount is not increased), ignition is carried out for sintering, the sintering thickness is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, sintering ores and the bedding material after sintering are obtained after sintering, the sintering ores and the bedding material after sintering are mixed to obtain sintering ore furnace burden (the mass of the bedding material after sintering is 2 percent of that of the sintering ores), and the furnace burden materials and the proportion in table 5 are smelted.
The test of example 2 was carried out in accordance with the method of example 1, and the test results showed that the cold-pressed pellet rotary drum index was 83.21%, and the utilization factor of the charged agglomerate was 0.980t/m3.h-1In-furnace permeability index 1987m3.min-1.Mpa-1Fuel ratio consumption 570kg/t, [ S ]]The content is 0.079%.
Example 3
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q2 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron-containing resource of plus 10mm are mixed and then are paved on a grate bar of a sintering machine, the thickness of a bedding material is controlled as shown in a table 6, the sintered materials are paved, ignition is carried out for sintering (the same as the sintered materials and the usage in a comparative example 1, only the usage of fuel is increased according to the table 6), the sintered thickness is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintered ore and the bedding material after sintering are obtained after the sintering is finished, the sintered ore and the bedding material after sintering are mixed to obtain a sintered ore burden (the mass of the bedding material after sintering is 2 percent of the mass of the sintered ore), and the burden materials and the proportion in the table 5 are smelted.
Example 3 was tested according to the method of example 1 and found to have a cold ball tumbler index of 77.86%,utilization coefficient of charged sinter 1.051t/m3.h-1In-furnace permeability index 2074m3.min-1.Mpa-1Fuel ratio consumption 568kg/t, [ S ]]The content is 0.077%.
Example 4
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q3 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron-containing resource of plus 10mm are mixed and then are paved on a grate bar of a sintering machine, the thickness of a bedding material is controlled as shown in table 6, the sintering material is paved (the sintering material and the usage are the same as those in comparative example 1, only the fuel usage is increased according to the table 6), ignition is carried out for sintering, the sintering thickness is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintered ore and the bedding material after sintering are obtained after sintering, the sintered ore and the bedding material after sintering are mixed to obtain the burden of the sintered ore (the mass of the bedding material after sintering is 2 percent of that of the sintered ore), and the burden materials and the proportion in table 5 are charged into the furnace for.
Example 4 was examined according to the method of example 1 and found to have a cold ball tumbler index of 72.17% and a charge sinter utilization factor of 0.987t/m3.h-1In-furnace permeability index 2022m3.min-1.Mpa-1Fuel ratio consumption 574kg/t, [ S ]]The content is 0.079%.
Example 5
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q3 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron-containing resource of plus 10mm are mixed and then are paved on a grate bar of a sintering machine, the thickness of a bedding material is controlled as shown in table 6, the sintering material is paved (the sintering material and the usage are the same as those in comparative example 1, only the fuel usage is increased according to the table 6), ignition is carried out for sintering, the thickness of the sintering material layer is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintering ore and the bedding material after sintering are obtained after sintering, the sintering ore and the bedding material after sintering are mixed to obtain the burden of the sintering ore (the mass of the bedding material after sintering is 2 percent of the mass of the sintering ore), and the burden components and the proportion in table 5 are.
The test result of example 5, which was conducted according to the method of example 1, was that the cold-pressed pellet rotary drum index was 83.21%, and the coefficient of utilization of the charged agglomerate was 0.975t/m3.h-1In-furnace permeability index 1945m3.min-1.Mpa-1The fuel ratio consumed 578kg/t, [ S ]]The content is 0.075%.
Example 6
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q3 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron-containing resource of plus 10mm are mixed and then are paved on a grate bar of a sintering machine, the thickness of a bedding material is controlled as shown in table 6, the sintering material is paved (the sintering material and the usage are the same as those in comparative example 1, only the fuel usage is increased according to the table 6), ignition is carried out for sintering, the thickness of the sintering material layer is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintering ore and the bedding material after sintering are obtained after sintering, the sintering ore and the bedding material after sintering are mixed to obtain a sintering ore burden (the mass of the bedding material after sintering is 2 percent of that of the sintering ore), and the burden materials and the mixture ratio in table 5 are smelted.
The test of example 6 according to the method of example 1 shows that the cold-pressed ball tumbler index is 83.21%, and the utilization factor of the sinter charged into the furnace is 0.964t/m3.h-1In-furnace permeability index 1947m3.min-1.Mpa-1Fuel ratio consumption 574kg/t, [ S ]]The content is 0.077%.
Example 7
Sieving iron-containing resource, proportioning the-10 mm part according to the proportion of Q3 cold-pressed balls in the table 3, and processing by pressure forming equipment to obtain the cold-pressed balls with the granularity of +10 mm. The fuel ratio change in the sintering batch is shown in table 6. The processed cold-pressed balls and the part with the iron-containing resource of plus 10mm are mixed and then are paved on a grate bar of a sintering machine, the thickness of a bedding material is controlled as shown in table 6, the sintered material is paved, ignition is carried out for sintering (the same as the sintered material and the usage in comparative example 1, only the fuel usage is increased according to the table 6), the thickness of the sintered material layer is 700mm, the ignition temperature is 1150 ℃, the speed of a trolley is 2.0m/h, the sintering negative pressure is 15KPa, the sintered ore and the bedding material after sintering are obtained after the sintering is finished, the sintered ore and the bedding material after sintering are mixed to obtain the burden of the sintered ore (the mass of the bedding material after sintering is 2 percent of the mass of the sintered ore), and the burden materials and the proportion in table 5 are.
Example 7 was examined according to the method of example 1 and found to have a cold ball tumbler index of 83.21% and a fired sinter utilization factor of 0.978t/m3.h-1Index of permeability in furnace 1992m3.min-1.Mpa-1Fuel ratio consumption 570kg/t, [ S ]]The content is 0.080%.
From the above embodiments, the present invention provides a method for utilizing iron-containing resources, comprising: screening the iron-containing resources to obtain the iron-containing resources with the size fraction of-10 mm and the iron-containing resources with the size fraction of +10 mm; crushing and grinding the iron-containing resource with the grain size of-10 mm to obtain powder with the grain size less than 0.5 mm; mixing the powder and bentonite, and then performing pressure forming to prepare a material with the granularity of more than 10 mm; and mixing the iron-containing resource with the grain size of +10mm and the material with the grain size of more than 10mm to obtain the sintering bedding material for preparing the sintering ore. The invention carries out pelletizing or agglomeration on the part of-10 mm after crushing and grinding the secondary resource containing iron with different granularity, the part of +10mm is directly used as a bedding material for replacing sintering, and then the part of +10mm is put into a furnace together with sintering mineral aggregate, and the secondary resource containing iron is utilized by replacing the sintering bedding material.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. A method of utilizing a ferrous resource, comprising:
screening the iron-containing resources to obtain the iron-containing resources with the size fraction of-10 mm and the iron-containing resources with the size fraction of +10 mm;
crushing and grinding the iron-containing resource with the grain size of-10 mm to obtain powder with the grain size less than 0.5 mm;
mixing the powder and bentonite, and then performing pressure forming to prepare a material with the granularity of more than 10 mm;
and mixing the iron-containing resource with the grain size of +10mm and the material with the grain size of more than 10mm to obtain the sintering bedding material for preparing the sintering ore.
2. The method of claim 1, wherein the iron-containing resource is selected from one or more of a stokehole iron ladle fly ash, a gravity fly ash, and a cloth bag fly ash.
3. The method of claim 1, wherein the mass content of TFe in the iron-containing resource is 34-52%.
4. The method according to claim 1, wherein the TFe content in the pulverized material is 20 to 30% by mass.
5. The method according to claim 1, wherein the bentonite is used in an amount of 2-4% by mass of the powder.
6. The method according to claim 1, wherein the press forming is performed at a press pressure of 50 to 100 KN.
7. The method according to claim 1, characterized in that the material with a particle size > 10mm is in the shape of a sphere or a block.
8. The method according to claim 1, wherein the ignition temperature in the process of preparing the sinter is 1100-1200 ℃, the speed of a trolley is 1.5-2.5 m/h, and the sintering negative pressure is 10-20 KPa.
9. The method of claim 1, further comprising:
and mixing the sintered ore and the sintered bedding materials sintered in the process of preparing the sintered ore to be used as the burden of the sintered ore for blast furnace smelting.
10. The method of claim 1, wherein the charge for blast furnace smelting comprises: the sintered ore burden, the pellet and the lump ore.
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CN108149008A (en) * 2018-01-11 2018-06-12 中南大学 To discard lump ore as the method for lateritic nickel ore hearth layer for sintering
CN109957651A (en) * 2019-05-10 2019-07-02 唐山瑞丰钢铁（集团）有限公司 Adjust the sintering production method of shop fixtures thickness of feed layer
CN210135774U (en) * 2019-06-11 2020-03-10 山东钢铁股份有限公司 Technological equipment for optimizing and adding sintering bottom material laying process
CN111023845A (en) * 2019-11-25 2020-04-17 攀钢集团攀枝花钢钒有限公司 Utilization method of sinter waste heat of circular cooler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1924035A (en) * 2005-09-01 2007-03-07 中南大学 Composite agglomeration technology of iron powdered ore
CN104711418A (en) * 2015-03-31 2015-06-17 攀钢集团攀枝花钢铁研究院有限公司 Method for using metallurgical iron-bearing dust in iron-making
CN105154667A (en) * 2015-08-20 2015-12-16 四川德胜集团钒钛有限公司 Sintering method for blast furnace
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CN108149008A (en) * 2018-01-11 2018-06-12 中南大学 To discard lump ore as the method for lateritic nickel ore hearth layer for sintering
CN109957651A (en) * 2019-05-10 2019-07-02 唐山瑞丰钢铁（集团）有限公司 Adjust the sintering production method of shop fixtures thickness of feed layer
CN210135774U (en) * 2019-06-11 2020-03-10 山东钢铁股份有限公司 Technological equipment for optimizing and adding sintering bottom material laying process
CN111023845A (en) * 2019-11-25 2020-04-17 攀钢集团攀枝花钢钒有限公司 Utilization method of sinter waste heat of circular cooler

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