CN114891997A - Method for making steel by directly utilizing iron-rich kiln slag of rotary kiln - Google Patents
Method for making steel by directly utilizing iron-rich kiln slag of rotary kiln Download PDFInfo
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- CN114891997A CN114891997A CN202210540853.9A CN202210540853A CN114891997A CN 114891997 A CN114891997 A CN 114891997A CN 202210540853 A CN202210540853 A CN 202210540853A CN 114891997 A CN114891997 A CN 114891997A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 265
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 132
- 239000002893 slag Substances 0.000 title claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 40
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000007731 hot pressing Methods 0.000 claims abstract description 36
- 239000002699 waste material Substances 0.000 claims abstract description 35
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000009628 steelmaking Methods 0.000 claims abstract description 27
- 239000011787 zinc oxide Substances 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000001465 metallisation Methods 0.000 claims abstract description 14
- 238000000462 isostatic pressing Methods 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003546 flue gas Substances 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 7
- 239000003830 anthracite Substances 0.000 claims description 7
- 239000002802 bituminous coal Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 abstract description 6
- 239000011701 zinc Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
-
- 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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
- C22B19/38—Obtaining zinc oxide in rotary furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for making steel by directly utilizing iron-rich kiln slag of a rotary kiln, which comprises the following steps: putting iron-zinc-containing steel waste and a reducing agent into a rotary kiln for roasting reduction; controlling the reduction temperature and the reduction time, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; and putting the obtained iron-rich blocks into a converter for steelmaking. The iron-rich block prepared by the method can directly meet the requirements of converter steelmaking on high iron metallization rate and physical specification, realizes the recycling of steelmaking waste, changes waste into valuable, reasonably optimizes resources, and has remarkable energy-saving, environment-friendly, social benefits and economic benefits.
Description
Technical Field
The invention belongs to the technical field of waste recovery and treatment, and particularly relates to a method for making steel by directly utilizing iron-rich kiln slag of a rotary kiln.
Background
The gravity dust collected by a gravity dust collector in the production of a steel-making or iron-making blast furnace is generally used; collecting bag-type dust collected by a bag dust collector in the production of a steel-making or iron-making blast furnace: gas ash collected from steel-making or iron-making blast furnace gas by a gravity dust collector or a bag dust collector: converter sludge collected in the converter steelmaking process and formed through wet processing; the iron oxide dust which is generated in the steel rolling process and can be diffused into the air, the steel rolling dust collected in the dust collecting process and the like. The solid dust contains considerable iron oxide and zinc oxide, and is a precious secondary resource. But steel-making or iron-making enterprises generally do not carry out effective recovery treatment on the waste materials containing the zinc-iron steel, but simply return the waste materials to the batching, so that unstable production is caused, and meanwhile, the non-ferrous metal zinc cannot be effectively recovered; or some enterprises only recycle the zinc in the kiln slag, and the obtained kiln slag cannot be utilized at high value. From the perspective of effective resource recycling, a reasonable resource recycling method is urgently needed. The application provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which aims to solve the technical problem.
Disclosure of Invention
The invention aims to provide a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which aims to solve the technical problem of recycling of steelmaking waste in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a method for directly utilizing the iron-rich kiln slag of a rotary kiln to make steel comprises the following steps:
step one, putting iron-zinc-containing steel waste and a reducing agent into a rotary kiln for roasting reduction;
step two, controlling the reduction temperature and the reduction time, and collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag;
conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks;
and step four, putting the obtained iron-rich blocks into a converter for steelmaking.
Further, before the step one, the method further comprises:
iron-zinc-containing steel waste and a reducing agent are crushed to a particle size diameter of less than 0.1 mm.
Further, before the second step, the method further comprises:
carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; the grade of the secondary zinc oxide is more than 45 percent.
Further, the reducing agent comprises one or more of carbon powder, coke powder, anthracite powder and bituminous coal powder which are mixed in any proportion; the content of carbon in the reducing agent is 60-80%.
Further, the mass ratio of the total iron and the reducing agent in the iron-zinc-containing steel scrap is 5: 1-2.
Further, the reduction temperature is 800-1200 ℃; the reduction time is 120-240 min.
Further, the iron metallization rate in the iron-rich kiln slag is more than 75%.
Further, the pressure of the hot-pressing treatment is 100-200 MPa; the temperature of the hot pressing treatment is 800-1000 ℃.
Further, the length of the iron-rich block is 120-300 mm; the width of the iron-rich block is 150-300 mm; the height of the iron-rich block is 100-300 mm.
The invention has the beneficial effects that:
the method recycles iron-zinc-containing steel waste to obtain a secondary zinc oxide product and iron-rich kiln slag, then conveys the iron-rich kiln slag to an isostatic press through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks, and then puts the obtained iron-rich blocks into steel conversion for steelmaking. In the isostatic pressing process, a lubricant is not required to be added into the raw materials, so that the pollution to the product is reduced, and the manufacturing procedure is simplified; the iron-rich block prepared by the method can directly meet the requirements of converter steelmaking on high iron metallization rate and physical specification, realizes the recycling of steelmaking waste, changes waste into valuable, reasonably optimizes resources, and has remarkable energy-saving, environment-friendly, social benefits and economic benefits.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow chart of a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Modes for carrying out the invention
Referring to fig. 1, the invention provides a method for making steel by directly using iron-rich kiln slag of a rotary kiln, which comprises the following steps:
step one, putting iron-zinc-containing steel waste and a reducing agent into a rotary kiln for roasting reduction;
step two, controlling the reduction temperature and the reduction time, and collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag;
conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks;
and step four, putting the obtained iron-rich blocks into a converter for steelmaking.
Further, the iron-zinc containing steel scrap and the reducing agent may be pulverized to a particle size of less than 0.1mm before the first step. It will be appreciated that the particle size diameter may take any value within the interval of less than 0.1 mm. Specifically, the particle diameter may be 0.05, 0.03, 0.01mm, or the like.
Further, before the second step, dust collection treatment can be carried out on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein the grade of the secondary zinc oxide is more than 45 percent. It is understood that the grade of the secondary zinc oxide can take any value within the range of more than 45%. Specifically, the grade of the secondary zinc oxide may be 50, 52, 55, 58%, or the like.
Furthermore, the reducing agent comprises one or a mixture of more of carbon powder, coke powder, anthracite powder and bituminous coal powder in any proportion; wherein the content of carbon in the reducing agent is 60-80%. It will be appreciated that the carbon content of the reducing agent may take any value within the interval 60-80%. Specifically, the carbon content of the reducing agent may be 60, 65, 70, 75, 80%, or the like.
Further, the mass ratio of the total iron and the reducing agent in the iron-zinc-containing steel scrap is 5: 1-2.
The invention controls the mass ratio of total iron to a reducing agent in iron-zinc-containing steel waste to be 5: 1-2, ensuring that the reducing agent is added in excess, i.e. in an amount higher than that required for the actual reduction.
Further, the reduction temperature is 800-1200 ℃; the reduction time is 120-240 min. It is understood that the reduction temperature can take any value within the range of 800-. Specifically, the reduction temperature may be 800, 900, 1000, 1100, 1200 ℃, or the like. Similarly, the reduction time may be 120, 150, 180, 210, 240min, or the like.
During the reduction process, the reducing agent can reduce the zinc oxide in the reduction system into metallic zinc. Pure elemental zinc has a boiling point (or vaporization temperature) of 907 ℃ (1 atm). When the reduction system is at 1 atmosphere, if the temperature is higher than the boiling point of the simple substance zinc, the simple substance zinc is gasified intoZinc vapour thereby escapes the reducing system of the molten phase into the air above it. In the subsequent process, as the treatment temperature is lowered, the zinc vapor is re-oxidized and converted into secondary zinc oxide (Zn 0); when the temperature exceeds 1100 ℃, ferrous oxide (Fe0) and ferric oxide (Fe) 2 0 3 ) And other metal oxides may participate in the reduction process.
Further, the iron metallization rate in the iron-rich kiln slag is more than 75%. It can be understood that the iron metallization rate in the iron-rich kiln slag can take any value within the range of more than 75%. Specifically, the iron metallization rate in the iron-rich kiln slag can be 77, 79, 81 or 85 percent and the like.
Further, the pressure of the hot-pressing treatment is 100-200 MPa; the temperature of the hot pressing treatment is 800-1000 ℃. It is understood that the pressure of the hot pressing process can take any value within the range of 100-200 MPa. Specifically, the pressure of the hot pressing treatment may be 100, 150, 180, 200MPa, or the like. Similarly, the temperature of the hot pressing treatment can be 800, 850, 900, 950 or 1000 ℃.
Wherein, the working principle of the hot isostatic pressing machine is as follows: the process of pressing and sintering the powder body into a compact part or material at high temperature and high pressure can improve the compactness and strength of the material. The isostatic pressing process does not need to add lubricant in raw materials generally, thus not only reducing the pollution to products, but also simplifying the manufacturing procedure; the hot isostatic pressing machine is adopted to carry out hot pressing treatment on the iron-rich kiln slag, the waste heat of the iron-rich kiln slag can be fully utilized to carry out hot pressing treatment on the iron-rich kiln slag, and the density and the strength of the iron-rich kiln slag can be improved so as to meet the requirements of converter steelmaking on raw materials.
Further, the length of the iron-rich block is 120-300 mm; the width of the iron-rich block is 150-300 mm; the height of the iron-rich block is 100-300 mm. Specifically, the length, width, and height of the iron-rich block may be 120 × 150 × 100, 150 × 200 × 150, 150 × 180 × 200, 200 × 200 × 200, or 300 × 300 × 300 mm.
The invention aims to meet the requirements of converter steelmaking on the physical specifications of raw materials by carrying out hot pressing treatment on the iron-rich kiln slag.
Example 1
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and coke powder are crushed to the particle size of 0.01 mm; wherein the mass ratio of total iron to coke powder in the iron-zinc-containing steel waste is 5: 1; the mass ratio of carbon in the coke powder to the content of carbon is 60 percent;
secondly, putting iron-zinc-containing steel waste and coke powder into a rotary kiln for roasting reduction;
thirdly, controlling the reduction temperature to rise from 800 ℃ to 1200 ℃, reducing for 240min, and collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 77%;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot pressing treatment is 100 MPa; the temperature of the hot pressing treatment is 1000 ℃; the length, width and height of the iron-rich block are 120 multiplied by 150 multiplied by 100 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
Example 2
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and coke powder are crushed to the particle size of 0.01 mm; wherein the mass ratio of total iron to coke powder in the iron-zinc-containing steel waste is 5: 2; the carbon content in the coke powder is 60 percent;
secondly, putting iron-zinc-containing steel waste and coke powder into a rotary kiln for roasting reduction;
thirdly, controlling the reduction temperature to rise from 800 ℃ to 1200 ℃, reducing for 240min, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein, the grade of the zinc oxide is 50 percent; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 77%;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot pressing treatment is 100 MPa; the temperature of the hot pressing treatment is 1000 ℃; the length, width and height of the iron-rich block are 120 multiplied by 150 multiplied by 100 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
Example 3
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and coke powder are crushed to the particle size of 0.05 mm; wherein the mass ratio of total iron to coke powder in the iron-zinc-containing steel waste is 5: 2; the carbon content in the coke powder is 60 percent;
secondly, putting iron-zinc-containing steel waste and coke powder into a rotary kiln for roasting reduction;
thirdly, controlling the reduction temperature to rise from 800 ℃ to 1200 ℃, reducing for 240min, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein, the grade of the zinc oxide is 50 percent; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 77%;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot pressing treatment is 100 MPa; the temperature of the hot pressing treatment is 1000 ℃; the length, width and height of the iron-rich block are 120 multiplied by 150 multiplied by 100 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
Example 4
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and carbon powder are crushed to the particle size of 0.03 mm; wherein the mass ratio of total iron to carbon powder in the iron-zinc-containing steel scrap is 5: 1; the carbon content in the carbon powder is 65%;
secondly, putting iron-zinc-containing steel waste and carbon powder into a rotary kiln for roasting reduction;
thirdly, controlling the reduction temperature to rise from 900 ℃ to 1200 ℃, reducing for 180min, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein, the grade of the zinc oxide is 52%; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 79 percent;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot pressing treatment is 150 MPa; the temperature of the hot pressing treatment is 900 ℃; the length, width and height of the iron-rich block are 150 multiplied by 200 multiplied by 150 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
Example 5
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and anthracite powder are crushed to the particle size of 0.01 mm; wherein the mass ratio of total iron to anthracite powder in the iron-zinc-containing iron and steel waste is 5: 2; the carbon content in the anthracite powder is 65 percent;
secondly, putting iron-zinc-containing steel waste and anthracite powder into a rotary kiln for roasting and reducing;
thirdly, controlling the reduction temperature to rise from 950 ℃ to 1200 ℃, reducing for 180min, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein, the grade of the zinc oxide is 55 percent; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 81 percent;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot pressing treatment is 180 MPa; the temperature of the hot pressing treatment is 800 ℃; the length, width and height of the iron-rich block are 150 multiplied by 180 multiplied by 200 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
Example 6
The invention provides a method for directly utilizing iron-rich kiln slag of a rotary kiln to make steel, which comprises the following steps:
firstly, iron-zinc-containing steel waste and pulverized bituminous coal are crushed to the particle size of 0.01 mm; wherein the mass ratio of total iron to bituminous coal powder in the iron-zinc-containing steel scrap is 5: 1; the carbon content in the bituminous coal powder is 60%;
secondly, putting iron-zinc-containing steel waste and coke powder into a rotary kiln for roasting reduction;
thirdly, controlling the reduction temperature to rise from 950 ℃ to 1200 ℃, reducing for 120min, and carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; wherein, the grade of the zinc oxide is 58%; collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag; wherein the iron metallization rate in the iron-rich kiln slag is 85%;
fourthly, conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks; wherein the pressure of the hot-pressing treatment is 200 MPa; the temperature of the hot pressing treatment is 800 ℃; the length, width and height of the iron-rich block are 300 multiplied by 300 mm;
and fifthly, putting the obtained iron-rich blocks into a converter for steelmaking.
The working principle of the invention is as follows:
the method recycles iron-zinc-containing steel waste to obtain a secondary zinc oxide product and iron-rich kiln slag, then conveys the iron-rich kiln slag to an isostatic press through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks, and then puts the obtained iron-rich blocks into steel conversion for steelmaking. In the isostatic pressing process, a lubricant is not required to be added into the raw materials generally, so that the pollution to products is reduced, and the manufacturing procedure is simplified; the iron-rich block prepared by the method can directly meet the requirements of converter steelmaking on high iron metallization rate and physical specification, realizes the recycling of steelmaking waste, changes waste into valuable, reasonably optimizes resources, and has remarkable energy-saving, environment-friendly, social benefits and economic benefits.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (9)
1. A method for directly utilizing iron-rich kiln slag of a rotary kiln for steelmaking is characterized by comprising the following steps:
step one, putting iron-zinc-containing steel waste and a reducing agent into a rotary kiln for roasting reduction;
step two, controlling the reduction temperature and the reduction time, and collecting the kiln slag in the rotary kiln to obtain iron-rich kiln slag;
conveying the obtained iron-rich kiln slag to an isostatic pressing machine through a quantitative feeding device for hot pressing treatment to obtain iron-rich blocks;
and step four, putting the obtained iron-rich blocks into a converter for steelmaking.
2. The method for making steel by directly using the iron-rich kiln slag of the rotary kiln as claimed in claim 1, further comprising before the first step:
iron-zinc containing steel waste and reducing agent are crushed to a particle size diameter of less than 0.1 mm.
3. The method for making steel by directly using the iron-rich kiln slag of the rotary kiln as claimed in claim 1, further comprising the step of:
carrying out dust collection treatment on the flue gas in the rotary kiln to obtain secondary zinc oxide; the grade of the secondary zinc oxide is more than 45 percent.
4. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 1, wherein the reducing agent comprises one or more of carbon powder, coke powder, anthracite powder and bituminous coal powder which are mixed in any proportion; the content of carbon in the reducing agent is 60-80%.
5. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 4, wherein the mass ratio of the total iron and the reducing agent in the iron-zinc-containing steel scrap is 5: 1-2.
6. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 1, wherein the reduction temperature is 800-1200 ℃; the reduction time is 120-240 min.
7. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 1, wherein the iron metallization rate in the iron-rich kiln slag is more than 75%.
8. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 1, wherein the pressure of the hot pressing treatment is 100-200 MPa; the temperature of the hot pressing treatment is 800-1000 ℃.
9. The method for making steel by directly utilizing the iron-rich kiln slag of the rotary kiln as claimed in claim 1, wherein the length of the iron-rich block is 120-300 mm; the width of the iron-rich block is 150-300 mm; the height of the iron-rich block is 100-300 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404337A (en) * | 2022-09-02 | 2022-11-29 | 湖南博一环保科技有限公司 | Full-automatic briquetting system for hot slag of rotary kiln |
| CN115491505A (en) * | 2022-10-24 | 2022-12-20 | 中冶节能环保有限责任公司 | Method and device for preparing hot-pressed blocks by removing impurities from zinc-containing and iron-containing dust mud at high temperature |
| CN115572839A (en) * | 2022-10-08 | 2023-01-06 | 北京首钢股份有限公司 | Method for preparing zinc hypoxide by treating iron-containing zinc-containing dust and sludge with rotary kiln |
| CN115595435A (en) * | 2022-10-24 | 2023-01-13 | 中冶节能环保有限责任公司（Cn） | Method and device for directly preparing hot-pressed block from high-temperature kiln slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483371A (en) * | 2015-12-21 | 2016-04-13 | 武钢集团昆明钢铁股份有限公司 | Method for comprehensively recycling lead and zinc containing blast furnace dust |
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- 2022-05-17 CN CN202210540853.9A patent/CN114891997A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483371A (en) * | 2015-12-21 | 2016-04-13 | 武钢集团昆明钢铁股份有限公司 | Method for comprehensively recycling lead and zinc containing blast furnace dust |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404337A (en) * | 2022-09-02 | 2022-11-29 | 湖南博一环保科技有限公司 | Full-automatic briquetting system for hot slag of rotary kiln |
| CN115404337B (en) * | 2022-09-02 | 2023-05-30 | 湖南博一环保科技有限公司 | Full-automatic briquetting system of rotary kiln hot slag |
| CN115572839A (en) * | 2022-10-08 | 2023-01-06 | 北京首钢股份有限公司 | Method for preparing zinc hypoxide by treating iron-containing zinc-containing dust and sludge with rotary kiln |
| CN115491505A (en) * | 2022-10-24 | 2022-12-20 | 中冶节能环保有限责任公司 | Method and device for preparing hot-pressed blocks by removing impurities from zinc-containing and iron-containing dust mud at high temperature |
| CN115595435A (en) * | 2022-10-24 | 2023-01-13 | 中冶节能环保有限责任公司（Cn） | Method and device for directly preparing hot-pressed block from high-temperature kiln slag |
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