CN116004978A - Sea sand ore sintering use method - Google Patents
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- CN116004978A CN116004978A CN202310009857.9A CN202310009857A CN116004978A CN 116004978 A CN116004978 A CN 116004978A CN 202310009857 A CN202310009857 A CN 202310009857A CN 116004978 A CN116004978 A CN 116004978A
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- 239000004576 sand Substances 0.000 title claims abstract description 137
- 238000005245 sintering Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000000203 mixture Substances 0.000 claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 230000004907 flux Effects 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 10
- -1 flux Substances 0.000 claims abstract description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical group [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 40
- 239000000292 calcium oxide Substances 0.000 claims description 20
- 235000012255 calcium oxide Nutrition 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 235000010755 mineral Nutrition 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000008188 pellet Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 238000005453 pelletization Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000000571 coke Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 238000009490 roller compaction Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- 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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Abstract
The invention relates to the technical field of sintering, in particular to a sea sand ore sintering use method. The sea sand ore sintering method comprises the steps of independently separating sea sand ore, adding binder, flux, coal powder or coke powder, rolling balls by a twin-roller, and adding the balls and other iron-containing ore mixtures except the sea sand ore into a sintering trolley for sintering. The sintering mixture obtained by sintering overcomes the problem of lower proportion of the sea sand ore in the prior art, improves the proportion of the sea sand ore, and reduces the cost.
Description
Technical Field
The invention relates to the technical field of sintering, in particular to a sea sand ore sintering using method.
Background
Due to the influence of rising price of iron ore, pig iron cost of iron enterprises is high, domestic steel enterprises gradually change the light to non-mainstream ore resources such as titanium-containing sea sand ore with relatively low price, but because of TiO in sea sand amount 2 Higher, there will be a great adverse effect both in the sintering and in the blast furnace smelting production. The sintering basic characteristics of the sea sand ore are poor, and the sintering of the sea sand ore can cause the rotary drum index of the sintering ore and the RDI of the low-temperature reduction pulverization index +3.15 The return rate is reduced, the yield is increased, and the yield is reduced. Therefore, the proportion of the sea sand ore used in sintering is relatively low, and is generally controlled below 3% in order to stabilize the yield and quality of the sintered ore. The sinter added with the titanium-containing sea sand ore can generate the conditions of slag viscosity, poor fluidity, difficult slag-iron separation, poor ventilation of the blast furnace, poor activity of a hearth and the like during blast furnace smelting, and can deteriorate furnace conditions in severe cases. Therefore, the titanium load of the whole raw materials of the blast furnace is generally controlled according to the running condition of the furnace so as to stabilize the production.
Disclosure of Invention
The invention aims at solving the problem that the sea sand ore is used in a larger proportion in the existing sintering process without affecting the sintering yield and quality index, and provides a sea sand ore sintering use method, which comprises the steps of independently separating sea sand ore in a batching scheme, adding binder, flux, coal powder or coke powder, rolling balls, adding the balls together with normal sintering materials into a sintering trolley for sintering, and specifically comprises the following steps:
the first step: mixing sea sand ore, binder, flux, coal powder and/or coke powder with water to obtain sea sand ore mixture;
and a second step of: performing twin-roll pelletizing on the sea sand ore mixture obtained in the first step to obtain sea sand ore pellets;
and a third step of: mixing and granulating iron-containing mineral powder, flux, coal powder and/or coke powder except sea sand ore to obtain a sintered mixture;
fourth step: and (3) mixing the sea sand ore balls obtained in the second step with the sintering mixture obtained in the third step, and adding the mixture into a sintering trolley for ignition sintering to obtain the mixed sinter.
The addition amount of the sea sand ore is 2-6 percent based on the total mass of the iron-containing ore material.
Wherein, in the first step, the content of the water is 7-10%.
The flux is quicklime or limestone, and the binary alkalinity of the sea sand ore mixture is 1.8-2.1 after the flux is added.
The addition amount of the pulverized coal/coke powder is 3-5% based on the total mass of the sea sand ore mixture.
Preferably, the binder is an organic binder and comprises resin and starch, and the addition amount of the binder is 1-3%.
In the second step, the ball pressing strength is more than or equal to 2000N, and when the ball pressing strength is too low, the sea sand ore balls are easy to pulverize;
the diameter of the sea sand ore ball is 30-50 mm, when the size is too large, the quantity of sea sand ore which is distributed into the material layer is too small, and the air permeability and the uniformity of the sintering material layer can be greatly influenced.
In the third step, the flux is lime or limestone, and after the flux is added, the binary alkalinity of the sintering mixture is 1.8-2.1.
The addition amount of the pulverized coal and/or the coke powder is 2-4% based on the total mass of the sintering mixture.
When the sea sand ore is mixed with the sintering mixture, the TiO in the sea sand ore 2 The invention mixes the sea sand ore with the carbon pressing ball independently and mixes the sea sand ore with the sintering mixture, thus solving the problem of the prior sea sand ore mixed in the sintering mixture that the sintering index is deteriorated.
The invention has the beneficial effects that:
on the basis of the prior art, in the sintering link for limiting the use of the sea sand ore, the sea sand ore is singly mixed for pelleting, so that the ore seeds are independent of a sintering mixture layer, the problems of sintering yield and quality degradation caused by the fact that the sea sand ore is uniformly mixed in the sintering mixture in the past are solved, and meanwhile, the sea sand ore sintering product is obtained, so that the sea sand ore is added in the sintering process without influencing the sintering effect, the proportion of the sea sand ore can be improved, and the process is simple and has strong operability.
Drawings
FIG. 1 is a flow chart of the use of the seasand sintering of the present invention.
Detailed Description
The invention is further illustrated by, but not limited to, the following examples and figures.
Example 1:
the production forms a batching scheme table 1 according to raw material stock and batching experience, wherein the table 1 comprises main components and adding proportions of the sea sand ore, and main components and adding proportions of other iron-containing mineral powder except the sea sand ore; the iron-containing ore powder other than the sea sand ore includes: k1 to k14 and scale; wherein the proportion of the sea sand ore is 6%.
Preparing sea sand ore balls: the sea sand ore is singly proportioned, and flux, binder and coke powder are added. The binder is prepared from organic binder starch, which is added according to 2% of the total mass of the sea sand ore mixture, and the flux is quicklime, which is added according to the binary alkalinity of the sea sand ore mixture of 2.0. The coke powder is added according to 4% of the total mass of the sea sand ore mixture. And (3) carrying out water distribution mixing on the prepared sea sand ore mixture, controlling the water content to be 9% of the total mass of the sea sand ore mixture, carrying out twin-roll ball pressing, wherein the oil pressure of a press roll is 18MPa, and preparing the prepared sea sand ore ball with the compressive strength of more than 2000N and the size of 30mm. The compressive strength of the sea sand ore balls is shown in Table 2 below. 10 samples were tested separately, and the compressive strength of each of the 10 samples was greater than 2000N.
Preparation of a sintering mixture: mixing k1-k14 and iron scale in table 1 according to the proportion in table 1, and simultaneously according to SiO in the mixture components 2 And CaO content, and adding flux quicklime, so that the mixture mixed with quicklime has binary alkalinity (CaO/SiO) 2 ) 2.0 of coke powder is added, and the adding amount is 3.3 percent of the total mass of the sintering mixture.
Mixing the sea sand ore balls and the sintering mixture, adding the mixture into a sintering machine for sintering, controlling the ignition time to be 1 minute, controlling the ignition temperature to be 1050 ℃, controlling the negative pressure to be 15KPa, and controlling the total thickness of cloth to be 860mm.
The production index of the prepared mixed sinter is shown as a sample S1 in Table 3,
in Table 3, sample D1 contains no sea sand ore balls, and the sintered ore is prepared by directly sintering the above sintering mixture;
and (3) adding the sea sand ore into the sample D2 normally, uniformly mixing the sea sand ore with other iron ores, flux and coke powder, granulating, and sintering to obtain the product. The components and contents were the same as those of sample S1 except for the sea sand ore content.
TABLE 1 proportions of iron-containing mineral and its main components
| Mineral aggregate type | TFe | SiO 2 | CaO | MgO | Al 2 O 3 | S | TiO 2 | H 2 O | P | Proportioning of |
| k1 | 62.56 | 4.88 | 0.055 | 0.016 | 1.67 | 0.017 | 0.375 | 8.52 | 0.064 | 4.40 |
| Sea sand mine | 59.26 | 5.8 | 1.24 | 1.38 | 3.03 | 0.04 | 6.7 | 10.2 | 0.044 | 6.00 |
| k2 | 61.16 | 3.87 | 0.06 | 0.12 | 2.33 | 0.02 | 0.108 | 10.3 | 0.1 | 14.80 |
| k3 | 56.3 | 6.23 | 0.07 | 0.12 | 3.2 | 0.038 | 0.17 | 10.15 | 0.067 | 25.00 |
| Iron scale | 73.04 | 11.1 | 2.00 | |||||||
| k4 | 63.50 | 4.36 | 0.10 | 0.13 | 1.75 | 0.02 | 0.15 | 12.73 | 0.07 | 7.00 |
| k5 | 47.66 | 5.45 | 4.12 | 0.88 | 2.86 | 0.14 | 0.14 | 4.52 | 0.065 | 2.00 |
| k6 | 63.63 | 4.61 | 1.67 | 1.21 | 1.01 | 0.18 | 0.154 | 15.07 | 0.036 | 5.80 |
| k7 | 56.02 | 11.69 | 0.04 | 0.35 | 1.75 | 0.034 | 0.099 | 11.2 | 0.095 | 2.00 |
| k8 | 60.52 | 9.03 | 0.04 | 0.02 | 1.74 | 0.034 | 0 | 8.3 | 0.051 | 7.00 |
| k9 | 60.71 | 6.38 | 2.25 | 1.84 | 1.22 | 0.267 | 0.189 | 9.9 | 0.078 | 8.00 |
| k10 | 55.31 | 13.47 | 0.04 | 0.05 | 1.38 | 0.034 | 0.121 | 10.4 | 0.069 | 6.70 |
| k11 | 58.5 | 6.9 | 0.25 | 0.14 | 2.9 | 0.034 | 0.183 | 9.8 | 0.074 | 8.00 |
| k12 | 35.72 | 8.37 | 18.53 | 4.16 | 1.49 | 0.05 | 0.652 | 2.98 | 0.710 | 0.50 |
| k13 | 53.36 | 6.03 | 13.33 | 3.76 | 2.87 | 0.330 | 0.194 | 15.80 | 0.150 | 0.30 |
| k14 | 52.92 | 6.30 | 12.28 | 1.70 | 2.81 | 0.015 | 0.11 | 0.00 | 0.069 | 0.50 |
TABLE 2 compressive strength of sea sand ore balls
| Numbering device | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Units, N | 2900 | 3200 | 3600 | 2700 | 3800 | 4000 | 3300 | 2900 | 2800 | 2600 |
TABLE 3 comparison of sintering production indexes
It can be seen that when the sea sand ore with 3% is added in normal sintering, the sea sand ore is uniformly mixed in the sintering material, the sintering index is obviously deteriorated, and when the technology is applied, the sea sand ore with 6% is added, the sintering index is not obviously fluctuated because the sea sand ore is not dispersed in the iron ore mixture.
Example 2:
production according to the raw material stock and the batching experience, a batching scheme table 4 is formed, wherein the table 4 comprises main components and adding proportions of the sea sand ore, and main components and adding proportions of other iron-containing mineral powder except the sea sand ore, the sea sand ore proportion is 4%, and the iron-containing mineral powder except the sea sand ore comprises: k1 to k11, and scale.
Preparing sea sand ore balls: the sea sand ore is singly proportioned, and flux, binder and coke powder are added. The binder is prepared from organic binder starch, which is added according to 2% of the total mass of the sea sand ore mixture, and the flux is quicklime, which is added according to the binary alkalinity of the sea sand ore mixture of 2.0. The coke powder is added according to 5% of the total mass of the sea sand ore mixture. And (3) carrying out water distribution mixing on the prepared sea sand ore mixture, controlling the water content to be 9% of the total mass of the sea sand ore mixture, carrying out twin-roller compaction, and carrying out pellet compression strength requirements to be more than 2000N and the size to be 40mm, wherein the compression resistance of the pellets is shown in the following table 5.
Preparation of a sintering mixture: mixing k1-k11 and iron scale in table 1 according to the proportion in table 4, and simultaneously according to SiO in the mixture components 2 And CaO content, and adding flux quicklime, so that the mixture mixed with quicklime has binary alkalinity (CaO/SiO) 2 ) 2.0 of coke powder is added, and the adding amount is 3.3 percent of the total mass of the mixture.
Mixing the sea sand ore balls and the sintering mixture, adding the mixture into a sintering machine for sintering, controlling the ignition time to be 1 minute, controlling the ignition temperature to be 1000 ℃, controlling the negative pressure to be 15KPa, and controlling the total thickness of cloth to be 880mm.
The production index of the prepared mixed sinter is shown as sample S2 in table 6, wherein,
sample D3 is a sintered ore prepared by directly sintering the sintering mixture without sea sand ore balls;
sample D4 is prepared by adding sea sand ore normally, uniformly mixing the sea sand ore with other iron ore, flux and coke powder, granulating, and sintering. The components and contents were the same as those of sample S2 except for the sea sand ore content.
Table 4 proportions of iron-containing mineral and its main components
| Mineral aggregate type | TFe | SiO 2 | CaO | MgO | Al 2 O 3 | S | TiO 2 | H 2 O | P | Proportioning of |
| k1 | 62.56 | 4.88 | 0.055 | 0.016 | 1.67 | 0.017 | 0.375 | 8.52 | 0.064 | 3.40 |
| Sea sand mine | 59.26 | 5.8 | 1.24 | 1.38 | 3.03 | 0.04 | 6.7 | 10.2 | 0.044 | 4.00 |
| k2 | 61.16 | 3.87 | 0.06 | 0.12 | 2.33 | 0.02 | 0.108 | 10.3 | 0.1 | 16.00 |
| k3 | 56.3 | 6.23 | 0.07 | 0.12 | 3.2 | 0.038 | 0.17 | 10.15 | 0.067 | 26.00 |
| Iron scale | 73.04 | 11.1 | 2.00 | |||||||
| k4 | 63.50 | 4.36 | 0.10 | 0.13 | 1.75 | 0.02 | 0.15 | 12.73 | 0.07 | 7.00 |
| k5 | 47.66 | 5.45 | 4.12 | 0.88 | 2.86 | 0.14 | 0.14 | 4.52 | 0.065 | 7.00 |
| k6 | 63.63 | 4.61 | 1.67 | 1.21 | 1.01 | 0.18 | 0.154 | 15.07 | 0.036 | 4.00 |
| k7 | 56.02 | 11.69 | 0.04 | 0.35 | 1.75 | 0.034 | 0.099 | 11.2 | 0.095 | 2.00 |
| k8 | 60.52 | 9.03 | 0.04 | 0.02 | 1.74 | 0.034 | 0 | 8.3 | 0.051 | 6.00 |
| k9 | 60.71 | 6.38 | 2.25 | 1.84 | 1.22 | 0.267 | 0.189 | 9.9 | 0.078 | 8.00 |
| k10 | 55.31 | 13.47 | 0.04 | 0.05 | 1.38 | 0.034 | 0.121 | 10.4 | 0.069 | 8.00 |
| k11 | 58.5 | 6.9 | 0.25 | 0.14 | 2.9 | 0.034 | 0.183 | 9.8 | 0.074 | 6.60 |
| k12 | 35.72 | 8.37 | 18.53 | 4.16 | 1.49 | 0.05 | 0.652 | 2.98 | 0.710 | 0 |
| k13 | 53.36 | 6.03 | 13.33 | 3.76 | 2.87 | 0.330 | 0.194 | 15.80 | 0.150 | 0 |
| k14 | 52.92 | 6.30 | 12.28 | 1.70 | 2.81 | 0.015 | 0.11 | 0.00 | 0.069 | 0 |
TABLE 5 compressive strength of sea sand ore balls
| Numbering device | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Units, N | 2800 | 3100 | 3000 | 2200 | 3100 | 3000 | 3200 | 2600 | 2800 | 2500 |
Table 6 sintering production index comparison
It can be seen that after the technology of the invention is applied, the sea sand ore is not dispersed into the iron ore mixture, 4% sea sand ore is added in the sintering process, and the index does not obviously fluctuate.
Example 3:
production according to raw material stock and batching experience, a batching scheme table 7 is formed, wherein table 7 comprises main components and adding proportions of sea sand ore, and main components and adding proportions of other iron-containing mineral powder except for the sea sand ore, wherein the sea sand ore is 3%, and the iron-containing mineral powder except for the sea sand ore comprises: k2 to k12, and scale.
Preparing sea sand ore balls: the sea sand ore is singly proportioned, and flux, binder and coke powder are added. The binder is an organic binder, and is added according to the total mass of the sea sand mixture of 2 percent, the flux is quicklime, and the binary alkalinity of the sea sand mixture of 2.0. The coke powder is added according to the total mass of the sea sand ore mixture of 4.5 percent. And (3) carrying out water distribution mixing on the prepared sea sand ore mixture, controlling the water content to be 9% of the total mass of the sea sand ore mixture, carrying out twin-roller compaction, and carrying out pellet compression strength requirements to be more than 2000N and the size to be 50mm, wherein the compression resistance of the pellets is shown in the following table 8.
Preparation of a sintering mixture: mixing k2-k12 and iron scale in table 1 according to the proportion in table 7, and simultaneously according to SiO in the mixture components 2 And CaO content, and adding flux quicklime, so that the sintered mixture after adding quicklime has binary basicity (CaO/SiO) 2 ) 2.0 of coke powder is added, and the adding amount is 3.3 percent of the total mass of the sintering mixture.
Mixing the sea sand ore balls and the sintering mixture, adding the mixture into a sintering machine for sintering, controlling the ignition time to be 1 minute, controlling the ignition temperature to be 1050 ℃, controlling the negative pressure to be 15KPa, and controlling the total thickness of cloth to be 880mm.
The production index of the prepared mixed sinter is shown as sample S3 in table 9, wherein,
sample D5 is a sintered ore prepared by directly sintering the sintering mixture without sea sand ore balls;
sample D6 is prepared by adding sea sand ore normally, uniformly mixing the sea sand ore with other iron ores, flux and coke powder, granulating, and sintering, wherein the components and the content are the same as sample S3.
TABLE 7 proportions of iron-containing mineral and its main components
TABLE 8 compressive strength of sea sand ore balls
| Numbering device | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Units, N | 2800 | 3100 | 3000 | 2200 | 3100 | 3000 | 3200 | 2600 | 2800 | 2500 |
Table 9 sintering production index comparison
It can be seen that after the technology of the invention is applied, the sea sand ore is not dispersed into the iron ore mixture, and the index does not obviously fluctuate due to the addition of the sea sand ore with the concentration of 3 percent during sintering.
Example 4
In this example, the other iron-containing ore materials in example 1 were replaced with iron-containing ore materials shown in table 10, and the other components and the production method were the same as in example 1.
Table 10 proportions of iron-containing ore materials other than sea sand ore and main components thereof
The production index of the prepared mixed sinter is shown as sample S4 in table 11, wherein,
sample D7 is a sintered ore prepared by directly sintering the sintering mixture without sea sand ore balls;
sample D8 is prepared by adding sea sand ore normally, uniformly mixing the sea sand ore with other iron ores, flux and coke powder, granulating, and sintering, wherein the components and the content are the same as sample S4.
Table 11 comparison of sintering production indexes
Therefore, after the technology is applied, the sea sand ore is not dispersed into the iron ore mixture, 6% of sea sand ore is added in the sintering process, and the index does not obviously fluctuate.
Example 5
In this example, the other iron-containing ore materials in example 1 were replaced with iron-containing ore materials shown in table 12, and the other components and the production method were the same as in example 1.
Table 12 proportions of iron-containing ore materials other than sea sand ore and main components thereof
The production index of the prepared mixed sinter is shown as sample S5 in table 13, wherein,
sample D9 is a sintered ore prepared by directly sintering the sintering mixture without sea sand ore balls;
sample D10 is prepared by adding sea sand ore normally, uniformly mixing and granulating the sea sand ore with other iron ores, flux and coke powder, and sintering, wherein the components and the content are the same as sample S5.
Table 13 comparison of sintering production indexes
Therefore, after the technology is applied, the sea sand ore is not dispersed into the iron ore mixture, 6% of sea sand ore is added in the sintering process, and the index does not obviously fluctuate.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the appended claims.
Claims (10)
1. The sea sand ore sintering use method is characterized by comprising the following steps:
the first step: mixing sea sand ore, binder, flux, coal powder and/or coke powder with water to obtain sea sand ore mixture;
and a second step of: performing twin-roll pelletizing on the sea sand ore mixture obtained in the first step to obtain sea sand ore pellets;
and a third step of: mixing and granulating iron-containing mineral powder, flux, coal powder and/or coke powder except sea sand ore to obtain a sintered mixture;
fourth step: and (3) mixing the sea sand ore balls obtained in the second step with the sintering mixture obtained in the third step, and adding the mixture into a sintering trolley for ignition sintering to obtain the mixed sinter.
2. The method for sintering sea sand ore according to claim 1, wherein the addition amount of the sea sand ore is 2-6% based on the total mass of the iron-containing ore material.
3. The method for sintering sea sand according to claim 1, wherein, in the first step,
the water content is 7-10% based on the sea sand ore mixture.
4. The method for sintering sea sand according to claim 1, wherein, in the first step,
the flux is quicklime or limestone, and the binary alkalinity of the sea sand ore mixture is 1.8-2.1 after the flux is added.
5. The method for sintering sea sand according to claim 1, wherein, in the first step,
the addition amount of the pulverized coal/coke powder is 3-5% based on the total mass of the sea sand ore mixture.
6. The method for sintering sea sand according to claim 1, wherein, in the first step,
the binder is an organic binder and comprises resin and starch, and the addition amount of the binder is 1-3% based on the total mass of the sea sand ore mixture.
7. The method for sintering sea sand according to claim 1, wherein in the second step,
the ball pressing strength is more than or equal to 2000N.
8. The method for sintering sea sand according to claim 1, wherein in the second step,
the diameter of the sea sand ore ball is 30-50 mm.
9. The method for sintering sea sand according to claim 1, wherein in the third step,
the flux is quicklime or limestone, and after the flux is added, the binary alkalinity of the sintering mixture is 1.8-2.1.
10. The method for sintering sea sand ore according to claim 1, wherein the addition amount of the pulverized coal and/or the pulverized coke is 2-4% based on the total mass of the sintering mixture in the third step.
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