CN113652545B - Production method of large-stacking-angle fluxed pellets - Google Patents
Production method of large-stacking-angle fluxed pellets Download PDFInfo
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- CN113652545B CN113652545B CN202110800218.5A CN202110800218A CN113652545B CN 113652545 B CN113652545 B CN 113652545B CN 202110800218 A CN202110800218 A CN 202110800218A CN 113652545 B CN113652545 B CN 113652545B
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- 239000008188 pellet Substances 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 23
- 239000010703 silicon Substances 0.000 claims abstract description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 10
- 239000000292 calcium oxide Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005453 pelletization Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 9
- 238000003723 Smelting Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 8
- 238000007873 sieving Methods 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a large-stacking-angle fluxed ballThe production method of the large-stacking-angle fluxed pellet comprises the following raw materials: high-silicon iron ore powder, 3-5 wt% of high-aluminum red mud and quicklime; siO in the high-silicon iron ore powder 2 The content is 5wt% -8 wt%; al in the high-alumina red mud 2 O 3 More than 20wt% of Na 2 The O content is more than 10wt%. The invention has the advantages that: the natural stacking angle of the large stacking angle melting agent pellet is more than 28 degrees, the rolling property is small, the rolling of the pellet in the furnace can be reduced, and the stable air flow in the blast furnace smelting process is ensured.
Description
Technical Field
The invention belongs to the technical field of blast furnace operation, and particularly relates to a production method of large-stacking-angle fluxed pellets.
Background
The proportion of the blast furnace burden pellet ore is improved, the iron-containing grade of the charged ore can be improved, the ore quantity and fuel ratio for ton iron can be reduced, the yield can be increased, the pollutant emission can be reduced, the energy conservation and emission reduction of an iron-making system can be promoted, and the flue gas treatment cost of the agglomeration process can be reduced. And is also an important measure for realizing the reduction of the production of the blast furnace and the minimization of the consumption. Along with the stricter and stricter environmental protection requirements, the environmental pollution caused in the production of sintering ore is difficult to bear, and along with the improvement of the production capacity of pellet ore in steel plants, the improvement of iron making technology and the environmental protection pressure in China, the high-proportion pellet blast furnace smelting becomes the development trend of blast furnace iron making in China. In order to implement high-proportion pellet smelting by blast furnace, low-silicon high-grade iron ore resources are required firstly, and most of domestic iron and steel plants for carrying out high-proportion pellet smelting by blast furnace need to import low-silicon iron ores from foreign countries such as Brazil, peru, australia and the like due to the limitation of national resource conditions, so that the iron and steel plants are easily limited by international situations. And secondly, as the pellets have the characteristics of small average particle size, uniform particle size, easy rolling, small natural stacking angle (only 24-27 degrees) and the like, along with the improvement of the proportion of the pellets entering the furnace, more and more pellets roll towards the center and the edge under the conditions of the same material distribution angle and material distribution mode, so that two gas flows at the center and the edge of the blast furnace are gradually weakened, and the negative influence on the economic index of the blast furnace is brought by the increase of the pressure difference of the blast furnace and the deterioration of the air permeability.
Chinese patent application No. 201710107979.6 discloses a high-silicon magnesium fluxing pellet for a blast furnace and a production method thereof, and the high-silicon magnesium fluxing pellet comprises the following components in percentage by mass: siO 2 2 3.5 to 5.5 percent of Al, 1.5 to 2.2 percent of MgO1.8 to 1.2 percent of alkalinity 2 O 3 ≤1.5％，K 2 O+Na 2 O is less than or equal to 0.1 percent, zn is less than or equal to 0.05 percent, and P is less than or equal to 0.07 percent. The silicon content of the pellet is high, the pellet can be produced by using high silicon iron concentrate powder, the use proportion of the pellet in a blast furnace is improved, the use range of the iron concentrate powder is widened, and the use proportion of the iron concentrate powder in the process is improved. Although the method can produce magnesium fluxing pellets by using high-silicon iron fine powder, the production cost is reduced, and meanwhile, the pellets with qualified quality can be obtained, so that the requirement of using high-proportion pellets by a blast furnace is met, the problems of strong pellet rolling property and unstable air flow caused by the fact that the pellets are distributed in the blast furnace are still not solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for producing large-stacking-angle fluxing agent pellets, which can greatly improve the utilization rate of domestic high-silicon iron ore powder, reduce the dependence on foreign high-price low-silicon high-iron concentrate powder and solve the problem of unstable blast furnace gas flow caused by easy rolling of the pellets.
In order to realize the purpose, the invention is realized by the following technical scheme:
a method for producing large-stacking-angle melt pellets, wherein the large-stacking-angle melt pellets comprise the following raw materials: high-silicon iron ore powder, 3-5 wt% of high-aluminum red mud and quicklime;
SiO in the high-silicon iron ore powder 2 The content is 5wt% -8 wt%;
al in the high-alumina red mud 2 O 3 More than 20wt% of Na 2 The O content is more than 10wt%.
The proportion of the grain size smaller than 0.074mm in the high-silicon iron ore powder is more than 50 percent; the proportion of the particle size fraction smaller than 0.074mm in the high-alumina red mud is more than 80 percent.
A method for producing large-stacking-angle melting pellets comprises the following steps:
1) Mixing high-silicon iron ore powder and high-aluminum red mud, adding quicklime to regulate the binary alkalinity of green pellets to 1.0-1.2, and regulating the SiO content in the green pellets 2 5 to 8 weight percent of Al 2 O 3 1 to 3 weight percent of Na 2 The O content is 0.5-1.0 wt%, and the raw pellets with the particle size of 6-10 mm are obtained by wetting, pelletizing and screening the raw pellets after being uniformly mixed;
2) The green pellets are roasted, and the roasting temperature is controlled to be 1200-1280 ℃.
The roasting in the step 2) adopts a belt roasting machine.
In the roasting process:
when the weight percentage of SiO in the pellets is less than or equal to 5 percent 2 When the content is less than 6wt%, controlling the roasting temperature to be 1250-1280 ℃;
when the weight percentage of SiO in the pellets is less than or equal to 6 percent 2 When the content is less than 7wt%, controlling the roasting temperature to be 1220-1250 ℃;
in the pellet, siO is more than or equal to 7 weight percent 2 When the content is less than 8wt%, controlling the roasting temperature to be 1200-1220 ℃;
the conglutination proportion of the pellets is more than or equal to 50 percent, and the natural stacking angle of the roasted pellets is more than 28 degrees; and (4) screening out pellets with the granularity of more than 8mm, and putting the pellets into a blast furnace ore tank.
Compared with the prior art, the invention has the beneficial effects that:
along with the increase of the proportion of the pellets entering the furnace, more and more pellets roll towards the center and the edge, so that the phenomena that the blast furnace smelting is influenced by the gradual weakening of two gas flows at the center and the edge of the blast furnace, the increase of the pressure difference of the blast furnace, the poor air permeability and the like caused by the rolling of the pellets are avoided. The invention promotes the pellets to be partially adhered to form grape clusters by controlling ore blending components and a roasting system, thereby achieving the purpose of improving the stacking angle of the pellets and further successfully improving the charging proportion of the pellets.
1) The invention uses the high-silicon iron ore powder for production, widens the application range of the domestic high-silicon iron ore powder, and reduces the dependence on foreign low-silicon high-iron ore powder during the production of the pellets;
2) The production method has strong operability and simple process;
3) The large-stacking-angle fluxed pellets produced by the method have the natural stacking angle of more than 28 degrees, and the small rolling property can reduce the rolling of pellets in the furnace and ensure the stable gas flow in the blast furnace smelting process;
4) The invention can realize the recycling of iron resources in the red mud, reduce the accumulation of the red mud and the pollution to the environment, and simultaneously achieve the purpose of increasing Al in the pellets 2 O 3 And Na 2 Content of O, al 2 O 3 And Na 2 O and SiO in original high-silicon iron ore powder 2 And the low-melting-point eutectic is formed with CaO, so that the pellets are favorably promoted to be adhered to each other, and the rolling performance of the pellets is reduced.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
Example 1:
the production method of the large-stacking-angle fluxed pellets comprises the following specific production processes:
(1) The components are proportioned according to the following requirements: siO 2 2 5wt% of Al 2 O 3 1.5wt% of Na 2 0.511wt% of O and 1.0wt% of binary alkalinity, wherein the proportion of the red mud is 5wt%, and the red mud components are shown in Table 1. The proportion of the high-silicon iron ore powder and the quicklime is calculated according to the requirements.
Table 1 red mud composition (wt,%)
| Composition (I) | Fe 2 O 3 | SiO 2 | Al 2 O 3 | CaO | Na 2 O |
| Content (c) of | 43.12 | 16.32 | 20.40 | 7.98 | 10.22 |
(2) The raw materials are mixed and ground, the proportion of the ore powder with the size fraction smaller than 0.074mm is more than 50 percent, the proportion of the red mud with the size fraction smaller than 0.074mm is more than 85 percent, and the ore powder, the red mud and the red mud are mixed and then are wetted and pelletized.
(3) Sieving green balls with a granularity range of 6-10 mm by using a sieving machine for roasting, and roasting by using a belt roasting machine, wherein the roasting temperature interval is controlled to be 1250-1280 ℃;
(4) And (4) placing the pellets with the granularity larger than 8mm after roasting into a blast furnace ore tank for later use.
Example 2:
the production method of the large-stacking-angle fluxed pellets comprises the following specific production processes:
(1) The components are proportioned according to the following requirements: siO 2 2 6wt% of Al 2 O 3 2wt% of Na 2 O is 0.52wt%, the binary alkalinity is controlled to be 1.1, wherein the proportion of the red mud is 4.5wt%, and the red mud is usedTable 2. The raw material ratio is calculated according to the above requirements.
Table 2 red mud composition (wt%)
| Composition (I) | Fe 2 O 3 | SiO 2 | Al 2 O 3 | CaO | Na 2 O |
| Content (wt.) | 45.21 | 11.52 | 14.32 | 3.96 | 11.57 |
(2) The raw materials are mixed and ground, the proportion of the ore powder with the size fraction smaller than 0.074mm is more than 60 percent, the proportion of the red mud with the size fraction smaller than 0.074mm is more than 90 percent, and the ore powder, the red mud and the red mud are mixed and then are wetted and pelletized.
(3) Sieving green balls with a sieving machine in a granularity range of 6-10 mm for roasting, and roasting by using a belt roasting machine, wherein the roasting temperature interval is controlled to be 1220-1250 ℃;
(4) And (4) placing the pellets with the granularity larger than 8mm after roasting into a blast furnace ore tank for later use.
Example 3:
the production method of the large-stacking-angle fluxed pellets comprises the following specific production processes:
(1) The components are proportioned according to the following requirements: siO 2 2 7wt% of Al 2 O 3 2.5wt% Na 2 O is 0.501wt%, the binary alkalinity is controlled to be 1.2, the proportion of the red mud is 4wt%, and the red mud components are obtained by calculating the raw material proportion shown in Table 3 according to the requirements.
TABLE 3 Red mud composition (wt%)
| Composition (I) | Fe 2 O 3 | SiO 2 | Al 2 O 3 | CaO | Na 2 O |
| Content (wt.) | 44.3 | 16.26 | 12.36 | 4.36 | 12.53 |
(2) The raw materials are mixed and ground, the proportion of the ore powder with the size fraction smaller than 0.074mm is more than 50 percent, the proportion of the red mud with the size fraction smaller than 0.074mm is more than 80 percent, and the ore powder, the red mud and the red mud are mixed and then are wetted and pelletized.
(3) Sieving green balls with the granularity of 6-10 mm by using a sieving machine for roasting, and roasting by using a belt roasting machine, wherein the roasting temperature interval is controlled to be 1200-1220 ℃;
(4) And (4) placing the pellets with the granularity larger than 8mm after roasting into a blast furnace ore tank for later use.
The composition, metallurgical properties and natural bank angle of the pellets produced in the above examples are shown in Table 4.
TABLE 4 pellet composition and metallurgical Properties
Claims (4)
1. The production method of the large-stacking-angle fluxed pellets is characterized in that the large-stacking-angle fluxed pellets comprise the following raw materials: high-silicon iron ore powder, 3-5 wt% of high-aluminum red mud and quicklime;
SiO in the high-silicon iron ore powder 2 The content is 5wt% -8 wt%;
al in the high-alumina red mud 2 O 3 More than 20wt%, na 2 The O content is more than 10wt%;
the production method of the large-stacking-angle fluxed pellets comprises the following steps:
1) Mixing high-silicon iron ore powder and high-aluminum red mud, adding quicklime to regulate the binary alkalinity of green pellets to 1.0-1.2, and regulating the SiO content in the green pellets 2 5 to 8 weight percent of Al 2 O 3 1 to 3 weight percent of Na 2 The O content is 0.5-1.0 wt%, and the raw pellets with the particle size of 6-10 mm are obtained by wetting, pelletizing and screening the raw pellets after being uniformly mixed;
2) The green pellets are roasted, and the roasting temperature is controlled to be 1200-1280 ℃.
2. The method for producing the large-stacking-angle fluxed pellets according to claim 1, wherein the proportion of the size fraction of less than 0.074mm in the high-silicon iron ore powder is more than 50%; the proportion of the particle size fraction smaller than 0.074mm in the high-alumina red mud is more than 80 percent.
3. The method for producing large-heap-angle fusible pellets as claimed in claim 1, wherein the roasting in step 2) is performed by a belt roaster.
4. The method for producing the large-stacking-angle fluxing pellets according to claim 1, wherein in the roasting process:
when the weight percentage of SiO in the pellets is less than or equal to 5 percent 2 When the content is less than 6wt%, controlling the roasting temperature to 1250-1280 ℃;
when in the pellet, siO is more than or equal to 6 weight percent 2 When the content is less than 7wt%, controlling the roasting temperature to be 1220-1250 ℃;
in the pellet, siO is more than or equal to 7 weight percent 2 When the content is less than 8wt%, controlling the roasting temperature to be 1200-1220 ℃;
the conglutination proportion of the pellets is more than or equal to 50 percent, and the natural stacking angle of the roasted pellets is more than 28 degrees; and (4) screening out pellets with the granularity of more than 8mm, and putting the pellets into a blast furnace ore tank.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536201A (en) * | 1976-07-07 | 1978-01-20 | Kobe Steel Ltd | Production of iron ore pellets using tuff |
| CN102816880A (en) * | 2012-08-17 | 2012-12-12 | 东北大学 | Ironmaking and aluminum extraction comprehensive utilization method of high-iron red mud |
| CN102828023A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Pellet with low bentonite content and production method thereof |
| CN102851491A (en) * | 2012-08-06 | 2013-01-02 | 莱芜钢铁集团有限公司 | Red mud composite binder for oxidized pellets |
| CN106987705A (en) * | 2017-02-27 | 2017-07-28 | 唐山钢铁集团有限责任公司 | Blast furnace high simatic fluxed pelletses and its production method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536201A (en) * | 1976-07-07 | 1978-01-20 | Kobe Steel Ltd | Production of iron ore pellets using tuff |
| CN102828023A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Pellet with low bentonite content and production method thereof |
| CN102851491A (en) * | 2012-08-06 | 2013-01-02 | 莱芜钢铁集团有限公司 | Red mud composite binder for oxidized pellets |
| CN102816880A (en) * | 2012-08-17 | 2012-12-12 | 东北大学 | Ironmaking and aluminum extraction comprehensive utilization method of high-iron red mud |
| CN106987705A (en) * | 2017-02-27 | 2017-07-28 | 唐山钢铁集团有限责任公司 | Blast furnace high simatic fluxed pelletses and its production method |
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