CN113930613A - Method for improving steel slag proportion in uniformly mixed ore - Google Patents
Method for improving steel slag proportion in uniformly mixed ore Download PDFInfo
- Publication number
- CN113930613A CN113930613A CN202111194369.7A CN202111194369A CN113930613A CN 113930613 A CN113930613 A CN 113930613A CN 202111194369 A CN202111194369 A CN 202111194369A CN 113930613 A CN113930613 A CN 113930613A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- proportion
- ore
- uniformly mixed
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 113
- 239000010959 steel Substances 0.000 title claims abstract description 113
- 239000002893 slag Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 87
- 229910052742 iron Inorganic materials 0.000 claims abstract description 41
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 238000005245 sintering Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000009628 steelmaking Methods 0.000 claims abstract description 12
- 238000007885 magnetic separation Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 239000002436 steel type Substances 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 25
- 239000011574 phosphorus Substances 0.000 claims description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 5
- 239000002367 phosphate rock Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000009825 accumulation Methods 0.000 abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 24
- 229910052720 vanadium Inorganic materials 0.000 description 16
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 16
- 239000000292 calcium oxide Substances 0.000 description 13
- 235000012255 calcium oxide Nutrition 0.000 description 13
- 230000008901 benefit Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 239000010459 dolomite Substances 0.000 description 5
- 229910000514 dolomite Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution 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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- 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
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for improving the proportion of steel slag in a uniformly mixed ore, which comprises the following four steps: (1) crushing the steel slag, wherein the granularity of the crushed steel slag is required to be less than or equal to 10 mm; (2) carrying out magnetic separation treatment on the steel slag, wherein the total iron content of the steel slag after magnetic separation is required to be more than or equal to 18% and less than or equal to 23% of TFe; (3) adjusting the batching structure participating in blending and ore blending according to the requirements of different steel types for molten iron P content in steelmaking and smelting; (4) the sintering mode of the uniformly mixed ore is 'thick material layer and slow machine speed'. The method solves the problems of steel slag accumulation and resource occupation and steel slag takeout iron element loss and waste caused by low utilization rate of the steel slag.
Description
Technical Field
The invention relates to a method for improving the proportion of steel slag in a uniformly mixed ore, belonging to the technical field of steel making.
Background
The quality of the mixed ore is closely related to the stability of sintering and blast furnace production, and the mixed ore production is to accurately prepare different types of iron raw materials meeting the requirements according to a certain proportion according to the requirements of a blast furnace on the sintered ore and form a large pile of mixed ore by adopting continuous and uniform distribution and accumulation. The steel slag is iron-containing waste material produced in the production process of the steel-making process, and can be used as a smelting solvent to participate in the blending of the uniformly mixed ores for recycling. However, in the actual mixed ore production, because the steel slag has the conditions of uneven granularity, bright iron content, large chemical component fluctuation, high burning loss and the like, under the severe pressure of maintaining the stable production of the sintering machine with one driving three (the material of a sintering machine for supplying three blast furnaces), the use ratio of the steel slag can be only maintained at about 2.5 percent at most, so that the comprehensive recovery utilization rate is only about 65 percent, and the accumulation of the residual steel slag not only occupies the limited site resources of a factory, but also brings great difficulty to the environmental protection management and control of a company.
An iron and steel co-production enterprise, which is mainly in the iron and steel industry, needs a large amount of ores every year, and for example, an iron and steel plant which produces 200 ten thousand tons of steel every year needs 420 ten thousand tons of iron ores every year, wherein 251 ten thousand tons of iron ore powder are used for sintering. The iron ore rises year by year along with the rise of the international ore price, so that the purchase cost is increased, and the raw material blending cost is greatly increased. And current steel works have a large amount of surplus of ferruginous waste material every year, for example slag, and it piles up not only to occupy the limited place resource of mill, has also improved the degree of difficulty of mill's production management and control, if adopt the mode of outward transport slag yard processing takeaway, and iron element will run off again, causes very big waste.
Disclosure of Invention
In view of the above, the present invention provides a method for improving the steel slag proportion in a uniformly mixed ore, so as to solve the problems of low steel slag utilization rate and iron element loss and waste in the existing production process.
In order to solve the technical problems, the technical scheme of the invention provides a method for improving the proportion of steel slag in uniformly mixed ore, which comprises the following steps: (1) crushing the steel slag, wherein the granularity of the crushed steel slag is required to be less than or equal to 10 mm; (2) carrying out magnetic separation treatment on the steel slag, wherein the total iron content of the steel slag after magnetic separation is required to be more than or equal to 18% and less than or equal to 23% of TFe; (3) adjusting the batching structure participating in blending and ore blending according to the requirements of different steel types for molten iron P content in steelmaking and smelting; (4) the sintering mode of the uniformly mixed ore is 'thick material layer and slow machine speed'.
Wherein, the requirements of different steel grades in steelmaking on the P content of molten iron are as follows:
(1) for high-quality steel grades, the molten iron P is required to be less than or equal to 0.1 percent;
(2) for plate and section steel seeds, the molten iron P is required to be less than or equal to 0.12 percent;
(3) for general steel grades, the molten iron P is required to be less than or equal to 0.14 percent.
The method for adjusting the batching structure participating in blending and ore blending comprises the following steps: under the condition that the steel slag proportion is 5%, the proportion of the high phosphate rock powder and the low phosphate rock powder is adjusted to ensure that the P content in the molten iron is within the required range. The total phosphorus content in the high-phosphorus ore powder is 25-35%, and the total phosphorus content in the low-phosphorus ore powder is 5-10%.
Preferably, the ingredients of the steel slag and the blending ore are separately loaded and discharged from the ingredient chamber. According to the invention, the mode of steel slag participating in blending ore blending is changed through optimization, the pre-blending rough blending is changed into the mode of independent warehousing and stable blanking of the blending chamber, and the blending degree of the blended ore is improved.
Preferably, aiming at the conditions that the steel slag contains bright iron and has high burning loss after the proportion of the steel slag in the mixed ore is improved, the trolley grate bars are cleaned frequently in the sintering production process, and particularly the cleaning frequency of the trolley grate bars in the sintering production process of the mixed ore is once every 2-3 hours. Because the steel slag contains bright iron, the grate bars of the trolley are easy to be stuck in the sintering production process, so that the air draft pressure of the trolley is increased, and the negative pressure of a large flue is increased; the burning loss of the steel slag reaches 6 percent, and the production pressure can be increased under the condition that one sintering machine supplies materials for three blast furnaces.
Aiming at the use of the steel slag, the principle of 'thick material layer and slow machine speed' is adhered to, and the optimal balance of yield and economic index under the condition of different steel slag proportions is explored on the premise of firstly ensuring the quality of the sinter. Namely, the proportion of the steel slag is increased to 5 percent, the sintering end point temperature is controlled to be more than or equal to 480 ℃ when the uniformly mixed ore is sintered, the machine speed of a sintering machine is controlled to be 2.01-2.09 m/min, and the material layer thickness is controlled to be 750-780 mm.
Compared with the prior art, the invention carries out magnetic separation treatment on the steel slag, removes large bright iron in the steel slag and narrows the fluctuation range of chemical compositions; the batching mode of the steel slag participating in the blending ore is changed optimally, the pre-batching rough batching is changed into the batching chamber for independent warehousing and stable blanking, and the blending degree of the blending ore is improved; according to the condition of uneven granularity of the steel slag, the steel slag is crushed, the granularity of the crushed steel slag is required to be less than or equal to 10mm, and the granulating effect of the mixture is ensured; aiming at the conditions that the steel slag contains open iron and has high burning loss, the trolley grate bars are cleaned frequently in the sintering production process, the stable large flue negative pressure is taken as the core in the process control range, and the reasonable matching range of the machine speed, the material layer thickness and the end point temperature control is obtained.
Through the steps, the proportion of the steel slag in the mixed ore is effectively improved to 5% from 2.5% in the prior art, so that the batching cost of the mixed ore production is saved, and the problems of resource occupation of steel slag accumulation and iron loss waste of steel slag takeout due to low utilization rate of the steel slag are solved.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The steel slag used in the following examples is produced in the steel-making process of vanadium-titanium limited of Sichuan Desheng group of the applicant of the invention, and the steel slag comprises the following specific chemical components:
| SiO2％ | CaO％ | MgO％ | Al2O3％ | TiO2％ | V2O5％ | P205％ | total iron (TFe)% |
| 8-13 | 37-42 | 6-7 | 2-3 | 1.8-2.5 | 2.5-4 | 1.8-2.4 | 45-52 |
The ingredients used in the blended ore production are shown in the following table:
theoretically, the proportion of the common mineral powder or the vanadium fine powder can be reduced by 1% when the proportion of the steel slag is increased by 1%. In consideration of the price performance ratio of single iron, the optimal Taihe vanadium fine powder is selected for comparison, the steel slag proportion is improved by 1 percent, and the blending cost of the blending ore can be reduced at least: (586.6-200)/100 ≈ 3.9 Yuan/ton.
Firstly, improving the mixture ratio of the uniformly mixed ore and steel slag:
2020.06.02-2020.07.02, the total ingredient structure of the mixed ore is basically stable, the steel slag proportion is 2.5%, the vanadium-titanium proportion is 58% (without steel slag), and the total refined powder proportion is 70%.
2020.07.03-2020.08.03, the steel slag and the blending ore are processed as follows, and the proportion of the blending ore and the steel slag is improved to 5 percent:
(1) crushing the steel slag, wherein the granularity of the crushed steel slag is less than or equal to 10 mm;
(2) carrying out magnetic separation treatment on the steel slag, wherein the total iron content of the steel slag after magnetic separation is more than or equal to 18% and less than or equal to 23% of TFe;
(3) the material mixing structure of the backward-pushing mixed ore is adjusted by the fact that the P content of the molten iron is less than or equal to 0.140%, the high-phosphorus rock powder and the low-phosphorus mineral powder are matched in a balanced mode, and the P content of the molten iron is always maintained to be less than or equal to 0.140% while the proportion of the mixed ore and steel slag is improved;
(4) aiming at the use of the steel slag, the principle of 'thick material layer and slow machine speed' is adhered to, and the optimal balance of yield and economic index under the condition of different steel slag proportions is explored on the premise of firstly ensuring the quality of the sinter. Namely, the proportion of the steel slag is increased to 5-8%, the sintering end point temperature is controlled to be not less than 480 ℃ when the uniformly mixed ore is sintered, the machine speed of a sintering machine is controlled to be 2.01-2.09 m/min, and the material layer thickness is controlled to be 750-780 mm.
The production process data of second, sixth and seventh months are compared as follows:
TABLE 1 comparison of the ore contents to be blended (unit:%)
TABLE 2 comparison of sinter compositions
| Month of the year | TFe | FeO | CaO | SiO2 | MgO | Al2O3 | S | TiO2 | V2O5 | P | R |
| 6 month | 47.4 | 8.47 | 15.2 | 5.53 | 3.13 | 2.78 | 0.127 | 4.86 | 0.402 | 0.056 | 2.75 |
| 7 month | 48.04 | 8.53 | 14.68 | 5.46 | 3.06 | 2.89 | 0.118 | 4.87 | 0.43 | 0.069 | 2.69 |
| Comparison of | 0.64 | 0.06 | -0.52 | -0.07 | -0.07 | 0.11 | -0.009 | 0.01 | 0.028 | 0.013 | -0.06 |
According to the long-term production exploration experience of an applicant, under the condition of the existing raw materials and auxiliary materials, the proportion of quicklime is increased or decreased by 0.25 percent every time, the alkalinity of a sintered ore is influenced by +/-0.05 times, and the level fluctuation of the sintered ore is 0.15-0.2 percent; the composition comparison shows that:
firstly, the calcium oxide content of the steel slag is high, the alkalinity of the steel slag reaches 3.90 times and is far higher than the alkalinity control of the sintering ore, and the level of the sintering ore is not reduced.
② the steel slag has high vanadium content, and the sintering ore has increased vanadium content. According to the iron-making vanadium recovery rate of 65 percent and the steel-making vanadium recovery rate of 75 percent, under the same furnace charge structure, the theoretical vanadium should rise: 0.028 × 53 × 65% × 75% ═ 0.007%. According to the conventional vanadium benefit measurement (the price of vanadium slag is about 1 ten thousand yuan/ton), about 1 yuan can be generated by 0.001 percent of vanadium. Namely, the steel slag proportion is improved by 2.5 percent, the vanadium rises by 0.007 percent, and the generated benefit is 7 yuan. Converting into 1% steel slag to generate 2.8-element vanadium benefit (the ratio of vanadium to titanium in molten iron in 7 months is 0.337%, the ratio of vanadium to titanium in the furnace is 68.34%, and the ratio of vanadium to titanium in the same month is respectively increased by 0.026% and 0.39%).
Thirdly, the steel slag contains high phosphorus, and the phosphorus content of the sinter increases. Because phosphorus cannot be removed in the sintering and iron-making processes, the steel slag proportion is improved by 2.5 percent and the phosphorus in molten iron is improved by 0.014 percent according to the increase of the phosphorus in the sintered ore (blending ore) by 100 percent to cause the increase of the phosphorus in the molten iron. According to data measured and calculated in the early stage of steelmaking, the method is characterized in that in molten iron P: under the condition of 0.110-0.140%, the increase of P by 0.001% affects the steel-making production cost by about 0.36 yuan. Namely, every time the steel slag proportion is increased by 1 percent, the steel-making production cost is influenced to rise: 14 x 0.36/2.5 ═ 2.0 elements.
Thirdly, comparing physical indexes (yield indexes) of the sintered ore:
TABLE 3 comparison of physical indexes of sinter
By comparison, the steel slag proportion is improved from 2.5% to 5.0%:
the physical indexes of the sinter are slightly improved. The steel slag can be used as a reinforcing agent of the sinter, and is beneficial to the conformity of high drum index of the sinter.
Secondly, the utilization coefficient of the sintering machine is increased, and the yield is improved. The method is consistent with the theory that the steel slag can improve the agglomeration rate of the sinter. However, the steel slag contains heavy iron and has high burning loss. Firstly, a downward opening parabola is used as a metaphor, and the proportion of the steel slag is less than or equal to 5.0 percent and still in the stage of upward climbing from the first half part, namely the proportion of the steel slag is in direct proportion to the yield; and secondly, the friction force of the bright iron on a conveying belt, a wide belt and the like is increased. Meanwhile, the grid section is easy to be burnt when melted in the sintering process, so that the air permeability of the sintering trolley is reduced, the service life of the grid section is shortened, and the like. Therefore, the influence of the consumption of auxiliary materials and the like on the sintering production cost needs to be further tracked.
Fourth, the raw molten fuel consumption index of the sinter
| Month of the year | Unit consumption of mineral powder | Unit consumption of quicklime | Dolomite unit consumption | Fuel consumption per unit |
| 6 month | 860 | 149 | 48 | 55.22 |
| 7 month | 882 | 134 | 38 | 54.94 |
| Comparison of | 22 | -15 | -10 | -0.28 |
By contrast, after the steel slag proportion is increased from 2.5% to 5.0%, firstly, calcium oxide in the steel slag can replace quicklime and magnesium oxide can replace dolomite to be added, and the flux consumption is saved; secondly, the oxidation heat release of Fe and FeO in the steel slag reduces the sintering fuel consumption:
firstly, according to the fact that the proportioning of the 0.25% quicklime affects 0.05 times of the alkalinity of the sinter, the method is sleeved into a 'batching measurement table', and the proportioning of the 0.25% quicklime affects the unit consumption of the quicklime by about 3 kg/t. Namely, the reduction is carried out to the same sintered ore to control the alkalinity, the unit consumption of the quicklime is reduced by 12kg/t, and the unit consumption of the dolomite is reduced by 10 kg/t. According to the unit price of quicklime of 500 yuan/ton and the unit price of dolomite of 190 yuan/ton, the unit consumption of the flux is reduced: 500 × 12/1000+190 × 10/1000 ═ 7.9 members.
Secondly, the unit consumption of the flux is reduced according to 15 percent of burnt loss of quicklime and 42 percent of burnt loss of dolomite, and theoretically, the ore consumption of the produced ton of sintered ore should be increased under the condition of not considering the burnt loss of the blending ore: 12 × 15% +10 × 42% ═ 6 kg/t; according to 690 yuan/ton mixing ore, the production cost is influenced to rise: 6 × 690/1000 ═ 4.14 yuan.
Consumption of fuel is reduced by 0.28kg/t, and production cost reduction is influenced according to 1150 yuan/ton of coke powder unit price: 0.28 × 1150/1000 is 0.32-membered.
Namely, the consumption of the sintering original melting fuel can be reduced when the steel slag proportion is increased by 1 percent: (7.9-4.14+0.32)/2.5 ═ 1.63.
Fifth, conclusion
In conclusion, under the same working condition and the same original melting fuel price system, the benefit can be generated when the proportion of the steel slag is increased by 1 percent when the ore is uniformly mixed: 3.9+2.8-2.0+1.63 ═ 6.33 membered; if the vanadium benefit is not considered, the production benefit is 3.9-2.0+ 1.63-3.53 yuan.
From 7 months in 2020, the proportion of the blended ore and steel slag produced by the applicant is greatly increased to 4.61% from about 2.5%, and during the period, the blended ore and steel slag is produced by about 108 ten thousand tons, and the total material saving cost is 108 multiplied by (4.61-2.5) multiplied by 3.53 and is approximately equal to 804 ten thousand yuan according to the 3.53 yuan for each 1% increase of the steel slag saving cost
Therefore, the invention effectively improves the proportion of the steel slag in the mixed ore from 2.5 percent in the prior art to 5 percent, saves the batching cost of the mixed ore production, and solves the problems of resource occupation of steel slag accumulation and iron element loss and waste of steel slag takeaway caused by low utilization rate of the steel slag.
While the foregoing embodiments show and describe the basic principles and principal features of the invention and advantages thereof, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms of practicing the invention without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, it being understood that various changes, modifications, substitutions and alterations may be made herein without departing from the principle and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (8)
1. A method for improving the proportion of steel slag in a uniformly mixed ore is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing the steel slag, wherein the granularity of the crushed steel slag is required to be less than or equal to 10 mm;
(2) carrying out magnetic separation treatment on the steel slag, wherein the total iron content of the steel slag after magnetic separation is required to be more than or equal to 18% and less than or equal to 23% of TFe;
(3) adjusting the batching structure participating in blending and ore blending according to the requirements of different steel types for molten iron P content in steelmaking and smelting;
(4) the sintering mode of the uniformly mixed ore is 'thick material layer and slow machine speed'.
2. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: the requirements of different steel grades in steelmaking on the content of molten iron P are as follows:
(1) for high-quality steel grades, the molten iron P is required to be less than or equal to 0.1 percent;
(2) for plate and section steel seeds, the molten iron P is required to be less than or equal to 0.12 percent;
(3) for general steel grades, the molten iron P is required to be less than or equal to 0.14 percent.
3. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: the method for adjusting the batching structure participating in blending and ore blending comprises the following steps: under the condition that the steel slag proportion is 5%, the proportion of the high phosphate rock powder and the low phosphate rock powder is adjusted to ensure that the P content in the molten iron is within the required range.
4. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 3, which is characterized in that: the total phosphorus content in the high-phosphorus ore powder is 25-35%, and the total phosphorus content in the low-phosphorus ore powder is 5-10%.
5. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: the steel slag is mixed with the ingredients of the blending ore and independently loaded and unloaded by a batching chamber.
6. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: the cleaning frequency of the trolley grate bars in the sintering production process of the uniformly mixed ore is once every 2-3 hours.
7. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: and controlling the sintering end point temperature to be more than or equal to 480 ℃ when the uniform mixed ore is sintered.
8. The method for improving the proportion of the steel slag in the uniformly mixed ore according to claim 1, which is characterized in that: the machine speed of the sintering machine is controlled to be 2.01-2.09 m/min during sintering of the uniformly mixed ore, and the thickness of a material layer is controlled to be 750-780 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111194369.7A CN113930613A (en) | 2021-10-13 | 2021-10-13 | Method for improving steel slag proportion in uniformly mixed ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111194369.7A CN113930613A (en) | 2021-10-13 | 2021-10-13 | Method for improving steel slag proportion in uniformly mixed ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113930613A true CN113930613A (en) | 2022-01-14 |
Family
ID=79278967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111194369.7A Pending CN113930613A (en) | 2021-10-13 | 2021-10-13 | Method for improving steel slag proportion in uniformly mixed ore |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113930613A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0416534A (en) * | 1990-05-07 | 1992-01-21 | Nippon Jiryoku Senko Kk | Method for utilizing slag and coal ash |
| CN103334004A (en) * | 2013-06-30 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine |
| CN104141018A (en) * | 2014-07-23 | 2014-11-12 | 重庆大学 | Recycling method for steel slag |
| CN104232885A (en) * | 2014-09-28 | 2014-12-24 | 四川德胜集团钒钛有限公司 | Method for blending ore of vanadium-titanium sintered ore |
| CN104232822A (en) * | 2014-09-28 | 2014-12-24 | 四川德胜集团钒钛有限公司 | Method for carrying out blast furnace iron making on high-phosphorus oolitic hematite and vanadium titano-magnetite |
| CN105714003A (en) * | 2016-04-14 | 2016-06-29 | 重庆大学 | Method for recovering iron in steel slag and using tailing thereof |
| CN110042179A (en) * | 2019-05-29 | 2019-07-23 | 新疆八一钢铁股份有限公司 | A kind of method that high phosphorus slag fine powder participates in mixing dosage |
-
2021
- 2021-10-13 CN CN202111194369.7A patent/CN113930613A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0416534A (en) * | 1990-05-07 | 1992-01-21 | Nippon Jiryoku Senko Kk | Method for utilizing slag and coal ash |
| CN103334004A (en) * | 2013-06-30 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine |
| CN104141018A (en) * | 2014-07-23 | 2014-11-12 | 重庆大学 | Recycling method for steel slag |
| CN104232885A (en) * | 2014-09-28 | 2014-12-24 | 四川德胜集团钒钛有限公司 | Method for blending ore of vanadium-titanium sintered ore |
| CN104232822A (en) * | 2014-09-28 | 2014-12-24 | 四川德胜集团钒钛有限公司 | Method for carrying out blast furnace iron making on high-phosphorus oolitic hematite and vanadium titano-magnetite |
| CN105714003A (en) * | 2016-04-14 | 2016-06-29 | 重庆大学 | Method for recovering iron in steel slag and using tailing thereof |
| CN110042179A (en) * | 2019-05-29 | 2019-07-23 | 新疆八一钢铁股份有限公司 | A kind of method that high phosphorus slag fine powder participates in mixing dosage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100465306C (en) | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same | |
| CN109652643B (en) | High-quality sinter for COREX smelting reduction iron-making process and preparation method thereof | |
| CN101560583B (en) | Converter coolant taking metallurgical waste as raw material and manufacturing method thereof | |
| CN104673951A (en) | Blast furnace smelting method by using vanadium-titanium two-phase sintering ore | |
| CN101476001B (en) | Method for smelting medium titanium slag by blast furnace | |
| CN111748666B (en) | Method for smelting low-silicon pig iron by using iron ore with complex mineral structure | |
| CN110295261B (en) | Smelting method of high-manganese steel-making molten iron | |
| CN101649390A (en) | Method for ultra-fine refined flour sintering for large-scale sintering machine | |
| CN102978384B (en) | Method for using steel slags during sintering | |
| CN104726696A (en) | Medium-alkali thick blanking layer sintering and producing method | |
| CN110184453A (en) | The sintering method of v-ti magnetite concentrate | |
| CN104372127A (en) | Method for improving furnace protection efficiency of blast furnace | |
| CN113604660A (en) | Dedusting ash micronized recycling process method | |
| CN112824547A (en) | Method for producing sintered ore from high-alumina iron ore powder | |
| CN104152614B (en) | The distributing process of blast furnace burden | |
| CN105420430A (en) | Vanadium titano-magnetite blast furnace burden structure and blast furnace smelting method | |
| CN111154970A (en) | Method for improving quality of sinter in sintering production of large-proportion limonite | |
| CN101560581B (en) | Converter coolant and manufacturing method thereof | |
| CN106480308A (en) | Method for reducing burnup of sintered solid | |
| CN107142120A (en) | High-reactivity coke and preparation method thereof | |
| CN113930613A (en) | Method for improving steel slag proportion in uniformly mixed ore | |
| CN1206377C (en) | V2O3 electro-aluminothermic process for smelting FeV | |
| CN116377213A (en) | Method for reducing burning up of sintered solid by adding pre-granulated carbon-containing solid waste | |
| CN1138864C (en) | V2O3 electro-aluminothermic process for semelting FeV50 | |
| CN114085938A (en) | Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220114 |