CN110184453B - Sintering method of vanadium-titanium magnetite concentrate - Google Patents
Sintering method of vanadium-titanium magnetite concentrate Download PDFInfo
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- CN110184453B CN110184453B CN201910604189.8A CN201910604189A CN110184453B CN 110184453 B CN110184453 B CN 110184453B CN 201910604189 A CN201910604189 A CN 201910604189A CN 110184453 B CN110184453 B CN 110184453B
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- 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
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
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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
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Abstract
The invention relates to the field of vanadium-titanium magnetite concentrate preparation, in particular to a sintering method of vanadium-titanium magnetite concentrate, which can effectively improve the quality of sintered mineral products, and comprises the following steps: mixing 5-10 parts of medium-grade common fine ore, 1-5 parts of fluorite mineral powder, 65-75 parts of vanadium-titanium magnetite concentrate, 3-8 parts of limestone powder, 6-10 parts of active lime and 4.5-5 parts of coke powder by weight to form a mixture, and controlling the alkalinity of the mixture to be 1.8-2.4; adding water into the mixture, and controlling the weight percentage of the water in the mixture after adding the water to be 7.2-7.6%; and performing primary mixed granulation and secondary mixed granulation, adding the materials subjected to secondary mixed granulation into a sintering machine for sintering, and finally obtaining a finished product. The invention controls the proportion of each material, realizes the sintering of the vanadium-titanium magnetite concentrate, increases the binding phase of the sinter, improves the liquid phase generation amount in the sintering process and improves the strength of the vanadium-titanium sinter. The invention is especially suitable for the sintering process of vanadium-titanium magnetite concentrate.
Description
Technical Field
The invention relates to the field of vanadium-titanium magnetite concentrate preparation, in particular to a sintering method of vanadium-titanium magnetite concentrate.
Background
China has abundant reserves of vanadium titano-magnetite, particularly a large amount of vanadium titano-magnetite in Panxi areas, and the sintering and blast furnace smelting technology for the Panxi vanadium titano-magnetite is relatively mature. However, for blast furnace smelting, the high titanium blast furnace slag still has high melting temperature and poor fluidity, which brings the problems of poor slag-iron separation effect, high smelting difficulty and the like. For the sintering process, the vanadium-titanium magnetite concentrate has SiO2Low content of TiO2The characteristic of high content leads to high liquid phase generation temperature and less liquid phase generation amount in the vanadium-titanium magnetite concentrate process, thus causing difficult sintering.
Disclosure of Invention
The invention aims to provide a sintering method of vanadium-titanium magnetite concentrate, which can effectively improve the quality of sintered mineral products.
The technical scheme adopted by the invention for solving the technical problems is as follows: the sintering method of the vanadium-titanium magnetite concentrate comprises the following steps: mixing 5-10 parts of medium-grade common fine ore, 1-5 parts of fluorite mineral powder, 65-75 parts of vanadium-titanium magnetite concentrate, 3-8 parts of limestone powder, 6-10 parts of active lime and 4.5-5 parts of coke powder by weight to form a mixture, and controlling the alkalinity of the mixture to be 1.8-2.4; then, adding water into the mixture, and controlling the weight percentage of the water in the mixture after adding the water to be 7.2-7.6%; and finally, carrying out primary mixed granulation and secondary mixed granulation, adding the materials subjected to secondary mixed granulation into a sintering machine for sintering, and finally obtaining a finished product.
Further, the vanadium-titanium magnetite concentrate contains TFe not less than 56% and SiO less than 3% in percentage by weight20.5 to 1 percent of CaO, 2 to 3 percent of Al2O30.5 to 0.8% of V2O59-12% of TiO2P less than 0.01%, S less than 0.3% and FeO content 20-30%.
Further, the medium-grade common fine ore comprises, by weight, not less than 50% of TFe and not less than 15-25% of SiO2。
Further, the fluorite ore powder contains CaF of not less than 60 percent in percentage by weight2And not less than 15% of SiO2。
Further, in the step of forming the mixture, the particle sizes of the medium-grade common ore, fluorite mineral powder, limestone powder and active lime are not more than 3mm, the particle size of the coke powder is not more than 5mm, the particle size of the vanadium-titanium magnetite concentrate is not more than 1mm, and more than 80% of particles capable of passing through a 200-mesh sieve in the vanadium-titanium magnetite concentrate are contained.
Further, in the step of forming the mixture, the fixed carbon is controlled to account for 2.8-3.5% of the weight of the mixture.
Further, when the materials after the second mixing granulation are added into a sintering machine for sintering, the height of a sintering material layer is controlled to be 750-850 mm.
Further, the height of the sinter layer is controlled to be 780-820 mm.
The invention has the beneficial effects that: in practical use, the invention reasonably controls the proportion of each material, realizes the sintering of the vanadium-titanium magnetite concentrate, can increase the binding phase of the sinter and effectively improves the liquid phase generation amount in the sintering process, thereby improving the strength of the vanadium-titanium sinter. The invention is especially suitable for the sintering process of vanadium-titanium magnetite concentrate.
Detailed Description
The sintering method of the vanadium-titanium magnetite concentrate comprises the following steps: mixing 5-10 parts of medium-grade common fine ore, 1-5 parts of fluorite mineral powder, 65-75 parts of vanadium-titanium magnetite concentrate, 3-8 parts of limestone powder, 6-10 parts of active lime and 4.5-5 parts of coke powder by weight to form a mixture, and controlling the alkalinity of the mixture to be 1.8-2.4; then, adding water into the mixture, and controlling the weight percentage of the water in the mixture after adding the water to be 7.2-7.6%; and finally, carrying out primary mixed granulation and secondary mixed granulation, adding the materials subjected to secondary mixed granulation into a sintering machine for sintering, and finally obtaining a finished product.
For vanadium-titanium magnetite concentrate, TiO is used due to lower TFe content2High content of SiO2The content is low, and the liquid phase amount is low in the sintering process, so that the strength of the sintered ore is low, the powder is more, and the yield and the quality of the sintered ore are seriously influenced. In the method, the first mixing granulation is mainly realized by fully mixing the materials with water, so that the preliminary mixing is realized; and (4) performing second mixing granulation, wherein the final granulation process is realized mainly on the basis of the first mixing granulation, and the finally granulated material is obtained. The invention utilizes the medium-grade common fine ore and fluorite fine ore with relatively low price to be added into the sintering mixture according to a certain proportion so as to increase the sintering CaF2Thereby improving the quality of the chromium-vanadium-titanium-containing sintered ore and reducing the production cost.
In order to further improve the quality of the produced product, such an optimization scheme may be selected: the vanadium-titanium magnetite concentrate comprises TFe not less than 56% and SiO less than 3% in percentage by weight20.5 to 1 percent of CaO, 2 to 3 percent of Al2O30.5 to 0.8% of V2O59-12% of TiO2P less than 0.01%, S less than 0.3%, and FeO content 20 to E30 percent; and selecting a scheme that: the medium-grade common fine ore comprises, by weight, not less than 50% of TFe and not less than 15-25% of SiO2(ii) a And selecting a scheme that: the fluorite mineral powder comprises CaF not less than 60 wt%2And not less than 15% of SiO2。
As an optimization of the mix, the following options can be selected: in the step of forming the mixture, the particle sizes of the medium-grade common ore, the fluorite mineral powder, the limestone powder and the active lime are not more than 3mm, the particle size of the coke powder is not more than 5mm, the particle size of the vanadium-titanium magnetite concentrate is not more than 1mm, and more than 80% of particles which can pass through a 200-mesh sieve in the vanadium-titanium magnetite concentrate are contained. Meanwhile, the following scheme can be selected: in the step of forming the mixture, the fixed carbon is controlled to account for 2.8-3.5% of the weight of the mixture, and the alkalinity (CaO/SiO) of the mixture2) 1.8-2.4, to further improve the quality of the product. Wherein, the fixed carbon is controlled to account for 3.0-3.3% of the weight of the mixture in the step of preferably forming the mixture.
In the final sintering, when the materials are preferably added into a sintering machine for sintering, the height of a sintering material layer is controlled to be 750-850 mm, and the height of the sintering material layer is further preferably controlled to be 780-820 mm.
Examples
Example 1
Firstly, mixing the following materials by weight:
A. crushing the medium-grade common ore into powder with the particle size of less than 3mm, wherein the proportion is 5-10%.
B. Crushing fluorite ore into powder with the particle size of less than 3mm, wherein the proportion is 1-5%.
C. The limestone and the active lime are crushed into powder with the particle size of less than 3mm, the proportion of the active lime is more than 6%, the limestone is adjusted according to different sintering alkalinity, and the proportion is generally 3-8%.
D. The particle size of the coke powder is controlled to be less than 5mm, and the mixture ratio is 4.5-5%.
E. The granularity of the vanadium-titanium magnetite concentrate is 80% or more in a range of-200 meshes, and the proportion of the vanadium-titanium magnetite concentrate is 65-75%.
The materials are mixed by adding water according to the proportion, the water content of the mixture is 7.2-7.6%, the fixed carbon is 3.0-3.3%, the alkalinity R0 of the mixture is 1.8-2.4, and the height of a material layer is 750-850 mm. The first mixing granulation time is 4 +/-1 min, the second mixing granulation time is 4 +/-1 min, and the mixture is added into a sintering machine for sintering after being mixed and granulated.
Wherein:
examples 1 to 3 were carried out using the exemplary embodiment of the present invention.
The raw fuel components used in examples 1 to 3 are shown in Table 1, the sintering ingredients thereof are shown in Table 2, and the sintering results thereof are shown in Table 3.
The fixed carbon content in the mixes of examples 1 to 3 was 3.06%, 3.18%, 3.30% in that order;
the basicity R0 of the mixes of examples 1 to 3 was 1.85, 1.90, 1.95 in that order;
in examples 1 to 3, the water content in the mixture after adding water was 7.30%, 7.40%, and 7.50% by weight in this order.
TABLE 1 crude, fuel major chemical composition/%)
TABLE 2 different CaF2Content sintering ratio (dry material)/weight portion
| Examples of the invention | Vanadium-titanium concentrate | Middle grade common ore | Fluorite ore | Limestone | Active lime | Coke powder |
| 1 | 70 | 8 | 2 | 6 | 7 | 4.6 |
| 2 | 70 | 7.5 | 2.5 | 5 | 8 | 4.8 |
| 3 | 70 | 7 | 3 | 4 | 9 | 5.0 |
TABLE 3 different SiO2Main index of content sintering
As can be seen from Table 3, with the increase of the ratio of fluorite ore, the drum strength, the yield and the sintering speed of the sintered ore are all increased to a certain extent, the drum strength of the sintered ore obtained by the method can reach more than 73%, the abrasion resistance index can reach less than 4.7%, and the yield can reach more than 72%.
The method of the invention overcomes the defect that SiO in vanadium-titanium magnetite concentrate2The problems of low sintering speed, poor strength of sintered ore and the like caused by direct sintering due to low content are solved, and the sintering reinforcement of the vanadium-titanium magnetite concentrate is realized by adding fluorite powder ore and medium-grade common ore; and the drum strength of the sinter is increased along with the gradual increase of the ratio of the fluorite ore, the yield is increased, the utilization coefficient is increased, and the production quality of the sinter is effectively improved. Meanwhile, the sintered ore contains 1-3% of CaF2The smelting temperature of the high-titanium furnace slag can be reduced for the subsequent blast furnace smelting, the flowing property of the furnace slag is improved, the smelting of the blast furnace is strengthened, the slag-iron separation effect is improved, the iron loss is reduced, and the like, so that the method has obvious effects, and has very wide market popularization prospect.
Claims (3)
1. The sintering method of the vanadium-titanium magnetite concentrate is characterized by comprising the following steps: mixing 5-10 parts by weight of medium-grade common fine ore, 1-5 parts by weight of fluorite mineral powder, 65-75 parts by weight of vanadium-titanium magnetite concentrate, 3-8 parts by weight of limestone powder, 6-10 parts by weight of active lime and 4.5-5 parts by weight of coke powder to form a mixture, and controlling the alkalinity of the mixture to be 1.8-2.4, wherein the vanadium-titanium magnetite concentrate contains TFe not less than 56% and SiO less than 3% in percentage by weight20.5 to 1 percent of CaO, 2 to 3 percent of Al2O30.5 to 0.8% of V2O59-12% of TiO2P less than 0.01%, S less than 0.3% and FeO content 20-30%, wherein the components of the medium-grade common fine ore comprise TFe not less than 50% and SiO not less than 15-25% in percentage by weight2The fluorite mineral powder contains CaF not less than 60 wt%2And not less than 15% of SiO2In the step of forming the mixture, the particle sizes of the medium-grade common ore, fluorite mineral powder, limestone powder and active lime are not more than 3mm,the particle size of the coke powder is not more than 5mm, the particle size of the vanadium-titanium magnetite concentrate is not more than 1mm, particles which can pass through a 200-mesh sieve in the vanadium-titanium magnetite concentrate account for more than 80%, and the fixed carbon is controlled to account for 2.8-3.5% of the weight of the mixture in the step of forming the mixture;
then, adding water into the mixture, and controlling the weight percentage of the water in the mixture after adding the water to be 7.2-7.6%;
and finally, carrying out primary mixed granulation and secondary mixed granulation, adding the materials subjected to secondary mixed granulation into a sintering machine for sintering, and finally obtaining a finished product.
2. The sintering method of vanadium-titanium magnetite concentrate according to claim 1, characterized in that: and (3) when the materials subjected to the second mixing granulation are added into a sintering machine for sintering, controlling the height of a sintering material layer to be 750-850 mm.
3. The method for sintering vanadium-titanium magnetite concentrate according to claim 2, wherein: the height of the sinter bed is controlled to be 780-820 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110672790A (en) * | 2019-09-18 | 2020-01-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving moisture uniformity and accuracy of sintering mixture |
| CN111926177B (en) * | 2020-09-22 | 2022-04-01 | 攀钢集团研究院有限公司 | Sintering method of high-grade vanadium-titanium magnetite concentrate and sinter |
| CN112322889B (en) * | 2020-11-20 | 2022-06-03 | 攀钢集团研究院有限公司 | Method for producing sinter of vanadium-titanium-iron concentrate |
| CN113981213B (en) * | 2021-09-28 | 2023-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering method of high-iron high-titanium superfine-particle-grade vanadium-titanium concentrate |
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