CN114196824B - Preparation method of slag steel hot-pressed block - Google Patents
Preparation method of slag steel hot-pressed block Download PDFInfo
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- CN114196824B CN114196824B CN202111325979.6A CN202111325979A CN114196824B CN 114196824 B CN114196824 B CN 114196824B CN 202111325979 A CN202111325979 A CN 202111325979A CN 114196824 B CN114196824 B CN 114196824B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 132
- 239000010959 steel Substances 0.000 title claims abstract description 132
- 239000002893 slag Substances 0.000 title claims abstract description 131
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 239000000696 magnetic material Substances 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000007731 hot pressing Methods 0.000 claims abstract description 22
- 238000007885 magnetic separation Methods 0.000 claims abstract description 11
- 239000006148 magnetic separator Substances 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 49
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 41
- 229910052742 iron Inorganic materials 0.000 description 17
- 238000012423 maintenance Methods 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 239000010814 metallic waste Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- 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
- C22B1/005—Preliminary treatment of scrap
-
- 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
- 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
- C21C2200/00—Recycling of waste material
Abstract
The invention relates to the technical field of solid waste recycling, and discloses a slag steel hot-pressing block preparation method, which comprises the steps of feeding small-particle slag steel below 5cm after screening into a first heating furnace for heating, then feeding into an impact crusher for crushing, feeding the crushed materials into a magnetic separator for magnetic separation, separating nonmagnetic materials and magnetic materials, detecting TFe content of the magnetic materials, returning to the step A) if TFe is smaller than a set TFe threshold value, feeding into the step E) if TFe is larger than or equal to the TFe threshold value, feeding the magnetic materials into a second heating furnace for heating, finally feeding the magnetic materials into a hot press in batches according to the specifications of a hot press die, and carrying out hot pressing treatment to obtain the slag steel hot-pressing block. The preparation method of the slag steel hot-pressed block solves the problems of low metal yield and resource waste caused by splashing caused by direct return of small-particle slag steel to a converter.
Description
Technical Field
The invention relates to the technical field of solid waste resource utilization, in particular to a preparation method of slag steel hot-pressed blocks.
Background
Slag steel is a typical secondary resource solid waste of ferrous metallurgy enterprises, and Gao Tiepin resources recovered in the processes of converter, refining and the like, such as slag splashing, ladle, tundish, tank bottom maintenance and the like are collectively called slag steel. The total iron content in the slag steel is generally above 60%, and is often directly used as scrap steel to be directly recycled to the converter.
However, the slag steel recovered by the converter has certain requirements on the size as the slag steel recovered by the scrap steel, the slag steel with overlarge volume can meet the use requirements of the returned converter by a cutting treatment method and the like, and the small slag steel with the volume below 5cm is very easy to cause splashing in the process of directly returning to the converter, so that ferrite is separated from the converter along with splashing, and the problems of low metal recovery efficiency, metal waste and the like are generated. The crushed slag steel is used by sintering, and ferrite therein is easily recovered, but the problems of repeated heating and energy waste are technically solved compared with a converter.
The hot briquetting process can be used for directly compacting the waste steel with high TFe content and can also be used for the pre-briquetting process of directly reducing the iron oxide ore. Slag steel is a common iron-containing resource in the ferrous metallurgy industry, and can be roughly regarded as a mechanical mixture of metallic iron and metallurgical slag, and the chemical component characteristics of the slag steel are also between metallic iron and iron oxide ore. Directly pressing slag steel, has low grade of a hot briquetting TFe, low substitution rate of scrap steel and repeatedly heating slag phase, and causes the problem of energy waste. While the briquetting-reduction process similar to the iron oxide ore treatment is adopted to treat the slag steel, although excellent scrap steel substitution products can be obtained, the process flow is longer, and the treatment cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the technology, and provides a preparation method of slag steel hot-pressed blocks, which solves the problems of low metal yield and resource waste caused by splashing caused by direct return of small-particle slag steel into a converter.
In order to achieve the above purpose, the preparation method of the slag steel hot-pressed block designed by the invention comprises the following steps:
a) Sending small particle slag steel below 5cm after sieving into a first heating furnace, heating to 300-500 ℃, and preserving heat for 5-10 min;
b) Rapidly feeding the small-particle slag steel into an impact crusher for crushing to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation to separate nonmagnetic materials and magnetic materials;
d) Detecting TFe content of the magnetic materials separated in the step C), returning to the step A) if the TFe is smaller than a set TFe threshold value, putting the magnetic materials into the first heating furnace again, and entering the step E if the TFe is larger than or equal to the TFe threshold value;
e) The magnetic material is sent into a second heating furnace, heated to 600-800 ℃ and kept for 5-10 min;
f) And feeding the magnetic materials into a hot press in batches according to the specifications of a die of the hot press, and carrying out hot pressing treatment to obtain slag steel hot-pressed blocks.
Preferably, the small-particle slag steel is Gao Tiepin resource recovered in the process of treating metallurgical slag in a converter and refining process and in the process of maintaining splash slag, steel ladle, tundish and tank bottom, and the chemical components are characterized in that: TFe is more than or equal to 60.0% and less than or equal to 80.0%, MFe is more than or equal to 50.0%, caO is more than or equal to 20.0%, mgO is more than or equal to 8.0%, siO 2 ≤10.0％，Al 2 O 3 Less than or equal to 5.0 percent, S less than or equal to 0.5 percent, and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the granularity of the small-particle slag steel is characterized in that the mass of particles below 5cm is more than or equal to 95 percent.
Preferably, in the step A), the heating temperature is 400 to 500 ℃.
Preferably, in the step B), the impact crusher is a vertical shaft impact crusher.
Preferably, in the step C), the nonmagnetic material is incorporated into the steel slag tailings for leaving the factory for sale.
Preferably, in the step D), the TFe threshold is 85.0% to 90.0%.
Preferably, in the step E), the heating temperature is 700 to 800 ℃.
Preferably, in said step F), the hot pressing temperature does not exceed 1300 ℃.
Preferably, in the step F), the hot press mold is a cuboid mold or a cylinder mold, the length, width and height of the cuboid mold are not more than 25cm, and the diameter and height of the cylinder mold are not more than 30cm.
Preferably, the prepared slag steel hot-pressed block is naturally cooled to 850-950 ℃, is quickly transported to a converter station in a heat-preserving way, and is directly added into the converter for subsequent smelting operation.
The principle of the invention is as follows:
the method for purifying the slag steel is adopted to pretreat the slag steel before hot pressing. Because the thermal expansion coefficient of metallic iron is larger than that of non-metallic oxide, in the slag steel heating process, internal stress is generated between iron phases and slag phases which are originally interwoven together due to different expansion degrees, and under the action of external force of an impact crusher, the separation of the iron phases and the slag phases is caused, so that the non-magnetic slag phases are separated through magnetic separation, and the purification of the slag steel is realized. And (3) after the slag steel is purified and hot pressed, quickly loading the slag steel into a converter to utilize heat energy to the greatest extent. Meanwhile, the hot pressing block is moderate in size, the machining significance is lost when the hot pressing block is too small, the single block is too large in weight, the impact on the converter lining is too large, the melting is slow, and meanwhile, the operation such as hot pressing block transportation and charging is inconvenient.
Compared with the prior art, the invention has the following advantages:
1. the problem of splashing waste caused by direct return of small-particle slag steel to the converter is solved;
2. compared with the back sintering utilization of small-particle slag steel, the problem of repeated heating of materials is avoided, energy is saved, and the utilization level of metal resources is improved;
3. the process is simple to operate, improves the grade of slag steel after purifying the small-particle slag steel, and reduces the consumption of converter heat on heating the steel slag;
4. the prepared hot-pressed block has proper volume and weight, is convenient and flexible to use, not only can be used for directly adding molten iron into a converter, but also can be used for adding scrap steel into other smelting procedure parts such as a molten iron runner, a ladle, a torpedo tank and the like, and can also be used for regulating temperature in the smelting process of the converter, thereby being particularly beneficial to the situation of adding scrap steel at multiple positions under the condition of large scrap steel ratio smelting in a steel mill;
5. the prepared hot briquetting has higher temperature, and the hot charging and hot feeding process is utilized, so that the resource energy utilization efficiency can be effectively improved, and the repeated energy consumption of the scrap steel preheating process is avoided.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The small-particle slag steel is Gao Tiepin resource recovered in the process of converter and refining process metallurgical slag treatment and the process of splash slag, ladle, tundish and tank bottom maintenance, and is characterized by comprising the following chemical components: TFe 61.4%, MFe 52.1%, caO 17.4%, mgO 6.3%, siO 2 7.4％，Al 2 O 3 3.4 percent, 0.4 percent of S and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the grain size of the small grain slag steel is characterized in that the grain mass is 95.7 percent below 5 cm.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 350 ℃, and preserving heat for 6min;
b) Rapidly feeding the small-particle slag steel into an impact crusher for crushing to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation to separate nonmagnetic materials and magnetic materials;
d) Performing TFe content detection on the magnetic material separated in the step C) to be 82.2%, wherein the requirement that TFe is not more than 85.0% is not met, returning to the step A), re-throwing the magnetic material into a first heating furnace, continuing the subsequent step, performing TFe content detection on the magnetic material obtained by the second crushing and magnetic separation to be 87.4%, and entering the step E), wherein the requirement that TFe is not less than 85.0% is met;
e) Feeding the magnetic material into a second heating furnace, heating to 650 ℃, and preserving heat for 6min;
f) The magnetic materials are fed into a hot press in batches of 65kg according to the specification of a hot press die, the hot press die is cuboid, the size is 20cm multiplied by 24cm, and slag steel hot-pressed blocks are obtained through hot pressing treatment, and the hot pressing temperature is 1250 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 930 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
Example 2
The small-particle slag steel is Gao Tiepin resource recovered in the process of converter and refining process metallurgical slag treatment and the process of splash slag, ladle, tundish and tank bottom maintenance, and is characterized by comprising the following chemical components: TFe 75.8%, MFe 60.1%, caO 8.4%, mgO 3.6%, siO 2 4.7％，Al 2 O 3 1.4 percent, 0.2 percent of S and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the granularity of the small-grain slag steel is characterized in that the grain mass is 95.8 percent below 5 cm.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 420 ℃, and preserving heat for 7min;
b) Rapidly feeding the small-particle slag steel into an impact crusher for crushing to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation to separate nonmagnetic materials and magnetic materials;
d) Detecting TFe content of the magnetic material separated in the step C) to be 90.2%, meeting the requirement that TFe is more than or equal to 85.0%, and entering the step E);
e) Feeding the magnetic material into a second heating furnace, heating to 720 ℃, and preserving heat for 7min;
f) The magnetic materials are fed into a hot press in batches of 80kg according to the specification of a hot press die, the hot press die is a cylinder, the size is phi 24cm multiplied by 25cm, and slag steel hot-pressed blocks are obtained through hot pressing treatment, and the hot pressing temperature is 1200 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 900 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
Example 3
The small-particle slag steel is Gao Tiepin resource recovered in the process of converter and refining process metallurgical slag treatment and the process of splash slag, ladle, tundish and tank bottom maintenance, and is characterized by comprising the following chemical components: TFe 67.5%, MFe 55.3%, caO 14.4%, mgO 6.1%, siO 2 5.4％，Al 2 O 3 2.1 percent, 0.3 percent of S and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the grain size of the small grain slag steel is characterized in that the grain mass is 96.2 percent below 5 cm.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 480 ℃, and preserving heat for 9min;
b) Rapidly feeding the small-particle slag steel into an impact crusher for crushing to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation, separating nonmagnetic materials and magnetic materials, and mixing the nonmagnetic materials into steel slag tailings for leaving factories for sale;
d) Detecting TFe content of the magnetic material separated in the step C) to be 90.2%, meeting the requirement that TFe is more than or equal to 85.0%, and entering the step E);
e) Feeding the magnetic material into a second heating furnace, heating to 780 ℃, and preserving heat for 9min;
f) The magnetic materials are fed into a hot press in batches of 55kg at a time according to the specification of a hot press die, the hot press die is cuboid, the size is 16cm multiplied by 24cm multiplied by 20cm, and slag steel hot-pressed blocks are obtained through hot pressing treatment, and the hot pressing temperature is 1270 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 880 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
Example 4
The small grain slag steel is produced by the metallurgical slag treatment process of a converter and a refining process and splashingGao Tiepin resources recovered in the maintenance process of slag, steel ladle, tundish and tank bottom are characterized by comprising the following chemical components: TFe77.5%, MFe 57.3%, caO 18.4%, mgO 7.1%, siO 2 6.4％，Al 2 O 3 3.1 percent, 0.4 percent of S and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the grain size of the small grain slag steel is characterized in that the grain mass is 95.0 percent below 5 cm.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 300 ℃, and preserving heat for 10min;
b) The small particle slag steel is quickly fed into an impact crusher, the impact crusher is a vertical shaft impact crusher, and crushing is carried out to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation, separating nonmagnetic materials and magnetic materials, and mixing the nonmagnetic materials into steel slag tailings for leaving factories for sale;
d) Detecting TFe content of the magnetic material separated in the step C) to be 92.2%, meeting the requirement that TFe is more than or equal to 90.0%, and entering the step E);
e) Feeding the magnetic material into a second heating furnace, heating to 600 ℃, and preserving heat for 10min;
f) And (3) feeding 75kg of the magnetic materials into a hot press in batches according to the specification of a hot press die, wherein the hot press die is cuboid, the size is 25cm multiplied by 25cm, and the slag steel hot-pressed block is obtained through hot pressing treatment, and the hot pressing temperature is 1300 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 850 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
Example 5
The small-particle slag steel is Gao Tiepin resource recovered in the process of converter and refining process metallurgical slag treatment and the process of splash slag, ladle, tundish and tank bottom maintenance, and is characterized by comprising the following chemical components: TFe76.5%, MFe 54.3%, caO 16.4%, mgO 6.1%, siO 2 5.4％，Al 2 O 3 3.8 percent of S0.32 percent, and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the granularity of the small-particle slag steel is characterized in that the mass of particles below 5cm is 96.3 percent.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 500 ℃, and preserving heat for 5min;
b) The small particle slag steel is quickly fed into an impact crusher, the impact crusher is a vertical shaft impact crusher, and crushing is carried out to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation, separating nonmagnetic materials and magnetic materials, and mixing the nonmagnetic materials into steel slag tailings for leaving factories for sale;
d) Detecting the TFe content of the magnetic material separated in the step C) to be 86.2%, meeting the requirement that TFe is more than or equal to 85.0%, and entering the step E);
e) Feeding the magnetic material into a second heating furnace, heating to 800 ℃, and preserving heat for 5min;
f) The magnetic materials are fed into a hot press in batches of 90kg according to the specification of a hot press die, the hot press die is a cylinder, the size is phi 25cm multiplied by 25cm, and slag steel hot-pressed blocks are obtained through hot pressing treatment, and the hot pressing temperature is 1300 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 950 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
Example 6
The small-particle slag steel is Gao Tiepin resource recovered in the process of converter and refining process metallurgical slag treatment and the process of splash slag, ladle, tundish and tank bottom maintenance, and is characterized by comprising the following chemical components: TFe68.5%, MFe 54.3%, caO 19.4%, mgO 6.4%, siO 2 8.3％，Al 2 O 3 4.1 percent, 0.35 percent of S and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the grain size of the small grain slag steel is characterized in that the grain mass is 95.8 percent below 5 cm.
A preparation method of slag steel hot-pressed blocks comprises the following steps:
a) Feeding small-particle slag steel below 5cm after sieving into a first heating furnace, heating to 400 ℃, and preserving heat for 8min;
b) The small particle slag steel is quickly fed into an impact crusher, the impact crusher is a vertical shaft impact crusher, and crushing is carried out to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation, separating nonmagnetic materials and magnetic materials, and mixing the nonmagnetic materials into steel slag tailings for leaving factories for sale;
d) Detecting TFe content of the magnetic material separated in the step C) to be 88.2%, meeting the requirement that TFe is more than or equal to 87.5%, and entering the step E);
e) Feeding the magnetic material into a second heating furnace, heating to 700 ℃, and preserving heat for 8min;
f) The magnetic materials are fed into a hot press in batches of 50kg according to the specification of a hot press die, the hot press die is cuboid, the size is 15cm multiplied by 20cm, and slag steel hot-pressed blocks are obtained through hot pressing treatment, and the hot pressing temperature is 1200 ℃.
In the embodiment, the obtained hot slag steel hot briquettes are naturally cooled to 900 ℃, are quickly transported to a converter station in a heat-preserving way, are directly added into a converter, and are subjected to subsequent smelting operations such as adding other scrap steel or adding molten iron.
The preparation method of the slag steel hot-pressed block solves the problem of splashing waste caused by direct return of small-particle slag steel into a converter; compared with the back sintering utilization of small-particle slag steel, the problem of repeated heating of materials is avoided, energy is saved, and the utilization level of metal resources is improved; the process is simple to operate, improves the grade of slag steel after purifying the small-particle slag steel, and reduces the consumption of converter heat on heating the steel slag; the prepared hot-pressed block has proper volume and weight, is convenient and flexible to use, not only can be used for directly adding molten iron into a converter, but also can be used for adding scrap steel into other smelting procedure parts such as a molten iron runner, a ladle, a torpedo tank and the like, and can also be used for regulating temperature in the smelting process of the converter, thereby being particularly beneficial to the situation of adding scrap steel at multiple positions under the condition of large scrap steel ratio smelting in a steel mill; the prepared hot briquetting has higher temperature, and the hot charging and hot feeding process is utilized, so that the resource energy utilization efficiency can be effectively improved, and the repeated energy consumption of the scrap steel preheating process is avoided.
Claims (8)
1. A preparation method of slag steel hot-pressed blocks is characterized by comprising the following steps: the method comprises the following steps:
a) Sending small-particle slag steel below 5cm after screening into a first heating furnace, heating to 300-500 ℃, and preserving heat for 5-10 min, wherein the small-particle slag steel is Gao Tiepin resources recovered in the process of treating metallurgical slag in a converter and refining process and in the process of maintaining splash slag, a ladle, a tundish and a tank bottom, and the chemical components are characterized in that: TFe is more than or equal to 60.0% and less than or equal to 80.0%, MFe is more than or equal to 50.0%, caO is more than or equal to 20.0%, mgO is more than or equal to 8.0%, siO 2 ≤10.0%，Al 2 O 3 Less than or equal to 5.0 percent, S less than or equal to 0.5 percent, and the balance of O element combined with Fe element and other unavoidable impurity elements, wherein the particle size of the small particle slag steel before sieving is characterized in that the mass of particles below 5cm is more than or equal to 95 percent;
b) Rapidly feeding the small-particle slag steel into an impact crusher for crushing to obtain crushed materials;
c) Feeding the crushed materials into a magnetic separator for magnetic separation to separate nonmagnetic materials and magnetic materials;
d) Detecting TFe content of the magnetic materials separated in the step C), returning to the step A) if the TFe is smaller than a set TFe threshold value, and re-feeding the magnetic materials into the first heating furnace if the TFe is 85.0% -90.0% of the TFe threshold value, and entering the step E) if the TFe is larger than or equal to the TFe threshold value;
e) Feeding the magnetic material with TFe greater than or equal to the TFe threshold value after the detection in the step D) into a second heating furnace, heating to 600-800 ℃, and preserving heat for 5-10 min;
f) And E) feeding the magnetic materials heated in the step E) into a hot press in batches according to the specifications of a die of the hot press, and carrying out hot press treatment to obtain slag steel hot-pressed blocks.
2. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in the step A), the heating temperature is 400-500 ℃.
3. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in the step B), the impact crusher is a vertical shaft impact crusher.
4. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in the step C), the nonmagnetic materials are incorporated into the steel slag tailings for leaving factories for sale.
5. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in the step E), the heating temperature is 700-800 ℃.
6. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in said step F), the hot pressing temperature is not more than 1300 ℃.
7. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: in the step F), the hot press mold is of a cuboid type or a cylinder type, the length, the width and the height of the cuboid type mold are not more than 25cm, and the diameter and the height of the cylinder type mold are not more than 30cm.
8. The method for preparing the slag steel hot-pressed block according to claim 1, wherein: and naturally cooling the prepared slag steel hot-pressed block to 850-950 ℃, rapidly preserving heat and transporting to a converter station, directly adding the slag steel hot-pressed block into a converter, and carrying out subsequent smelting operation.
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