CN113828743A - High-sodium oxide premelted refining slag containing phosphorous slag and production method thereof - Google Patents
High-sodium oxide premelted refining slag containing phosphorous slag and production method thereof Download PDFInfo
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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Abstract
The invention relates to the technical field of auxiliary materials in the metallurgical industry, in particular to phosphorous slag-containing high-sodium oxide premelted refining slag and a production method thereof. The chemical composition comprises the following components in percentage by mass: SiO 2236‑42％,CaO 21‑27％,Na2O 26‑31％,Al2O32 to 4 percent. The method solves a plurality of problems of the continuous casting covering slag for stainless steel and special steel in production, avoids the problems of melting faults caused by overlarge difference of melting points of high-sodium oxide raw materials, unbalanced heating and melting of high-alkalinity premelted materials and impurity removal effect.
Description
Technical Field
The invention relates to the technical field of auxiliary materials in the metallurgical industry, in particular to high-sodium oxide premelted refining slag containing phosphorous slag and a production method thereof when the high-sodium oxide premelted refining slag is used as a production raw material of continuous casting covering slag.
Background
The continuous casting protective slag is an important auxiliary material in the production of ferrous metallurgy. It can protect molten steel from secondary oxidation and remove various impurities on the surface of molten steel. The covering slag can be gradually sintered and melted in the crystallizer through heat released by molten steel and attached to the liquid level of the crystallizer-molten steel to form a multilayer solid slag film-liquid slag protecting structure. The continuous casting temperature of stainless steel can reach 1470-1490 ℃ after years of development of the prior art, but is still relatively low. In order to meet the continuous casting characteristics of low-temperature molten steel, continuous casting mold flux with low melting point and low viscosity is generally required to ensure higher melting speed and better liquid slag fluidity.
It is pointed out in the prior art, such as patent application 94113955.7, that increasing the basicity of the slag, which is the proportion of calcium oxide in the slag, has been shown to enhance the ability of the slag to absorb oxide inclusions, and in particular to desulphurize. However, too high basicity will seriously deteriorate the vitrifiability of the slag and reduce the lubricity of the slag. Therefore, at home and abroad, technicians in the field always develop a novel continuous casting mold flux to take the two problems into consideration. In the eight and ninety years of the last century, germany invented a process of melting slag materials with other auxiliary materials and then spraying the molten slag materials in a high tower for granulation to prepare hollow slag particles so as to promote the reduction of the melting temperature of continuous casting mold flux, but still cannot solve the performance problem of oxide inclusions.
In recent years, the korean metallurgy industry has prepared high-sodium oxide continuous casting mold flux by preparing premelted refining slag and then increasing the sodium oxide content in the continuous casting mold flux by adding a large amount of soda ash to the continuous casting mold flux formulation; so as to solve the problem of glass deterioration caused by the continuous casting mold flux with high calcium oxide alkalinity. However, the above method also has various problems: 1, the high proportion of the soda ash can influence the volume density of the continuous casting covering slag, so that the bulk density is reduced and the volume is too large; 2, the continuous casting covering slag has low particle strength, the particles are easy to damage, and the complete hollow particle state is difficult to form, so that the fluidity and the covering property of the continuous casting covering slag in a crystallizer are influenced; 3, the production process of the high-purity alkali proportion formula is accompanied by larger smoke dust, which has serious influence on the production environment and the service life of a dust remover.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-sodium oxide premelted refining slag containing phosphorous slag and a production method thereof, aiming at solving the problems in the production of continuous casting covering slag for stainless steel and special steel in the background technology.
The technical scheme adopted by the invention for realizing the purpose is as follows: the high-sodium oxide premelted refining slag containing phosphorous slag comprises the following chemical components in percentage by mass: SiO 22 36-42％,CaO 21-27％,Na2O26-31％,Al2O3 2-4％。
The production method of the premelted refining slag used as the raw material for producing the continuous casting covering slag comprises the following steps of:
50 wt% of phosphorous slag, 15-17 wt% of solid sodium silicate, 20-25 wt% of wollastonite, 42-45 wt% of sodium carbonate,
prepared according to the raw material composition given above.
Further, the process steps of the production method of the premelted refining slag specifically comprise: a, weighing the ground raw materials in proportion, and drying the raw materials at 150 ℃ at 100-; b, putting the mixture into a storage bin, entering a stirrer after passing through a hoister, stirring and discharging; and C, heating by natural gas and coke kilns or electric arc furnaces, wherein the premelting temperature is 1000-1300 ℃, preferably 1250 ℃, and D, finally, melting, quenching, drying and grinding to obtain the high-sodium oxide premelted refining slag. Preferably, the premelted product in the step C is melted and then flows into a cold water pool for quenching, and the quenched premelted refining slag is dried and then ground until the granularity content of 200 meshes is more than 95 wt%, so that the premelted refining slag for the continuous casting covering slag is obtained.
Preferably, the phosphorus slag is the production tailings of a yellow phosphorus factory, and is obtained by quenching and granulating a melt which is obtained when preparing yellow phosphorus and takes calcium silicate as a main component. The chemical composition of the phosphorous slag is preferably as follows: SiO 22 36-42％，CaO 40-47％,Al2O3 2-5.5％,Fe2O3 0.2-1.5％,P2O50.6-2.4% of the total weight of the composition and 1.6-2.5% of F. The phosphorous slag preferably has the potential mineral phases of pseudo wollastonite, gunite and 30% or less of apatite, and the structure of the phosphorous slag is more than 90 wt% of vitreous body.
Further, the production method of the finished product of the continuous casting mold flux specifically comprises the following process steps:
a. weighing the raw materials after the drying and grinding pretreatment according to a ratio, b, putting the raw materials into a storage bin, lifting the raw materials by a crane, then putting the raw materials into a raw material stirrer for high-speed stirring, c, pumping the raw materials into a low-speed stirrer for stirring and then sieving, d, pumping the raw materials into a spray drying tower through a plunger pump, igniting and heating the raw materials by a burner until the granulation drying temperature is 550-600 ℃, performing spray granulation, and e, drying and granulating the finished product, and then feeding the finished product into a product storage bin for subpackaging. Preferably, sampling tests are performed at steps a, b, e.
The high-sodium oxide premelted refining slag containing phosphorous slag and the production method thereof have the beneficial effects that:
the premelted refining slag of the invention: 1. the chemical components are uniform, the melting point is low, the melting speed is high, the viscosity is low, the surface tension of the molten slag is reduced, and the smelting time is shortened; 2. the impurities are less, and the furnace lining and the steel ladle are not corroded; 3. compact structure, small volume and convenient storage and transportation; 4. because the phase is stable, the slagging speed is fast, the dust pollution of the post-added sodium carbonate to the iron and steel plant can be reduced, and the refining process is comprehensively stable; 5. the casting powder does not contain impurities such as hydrogen, nitrogen, carbon and the like, improves the flowing coverage of the continuous casting protective slag in the crystallizer, is favorable for adsorbing impurities due to high sodium oxide composition, and improves the quality of steel.
The invention comprehensively utilizes the industrial waste slag and the phosphorus slag, the phosphorus slag can be well fused with other raw materials when the low-melting-point premelted refining slag is produced, the phenomenon that the melting fault occurs when the difference of the melting points of the raw materials is too large is avoided, the unbalance of heating and melting of the high-alkalinity premelted material is avoided, the heat transfer problem is solved, and the molten slag is discharged uniformly and continuously. In addition, a new effective utilization way is found for a large amount of phosphorus slag in yellow phosphorus plants, and the method has good application prospect.
Drawings
FIG. 1 is a schematic flow chart of a device in the production process of the stainless steel continuous casting mold flux in the embodiment of the invention.
Detailed Description
The invention is further explained in detail with reference to the drawings and the specific embodiments;
example 1:
in the production process of stainless steel continuous casting covering slag, the premelted refining slag of the invention which uses phosphorous slag as a base material in the formula replaces pure wollastonite and soda base materials, and carbon black and a binder are added simultaneously, and the stainless steel continuous casting covering slag is produced in a spray granulation mode. The specific production flow of the finished product of the continuous casting mold flux is shown in figure 1:
a. weighing the raw materials subjected to drying and grinding pretreatment according to a ratio, b, putting the raw materials into a storage bin, lifting the raw materials by a crane, then stirring the raw materials in a raw material stirrer at a high speed, c, pumping the raw materials into a low-speed stirrer, stirring the raw materials, sieving the mixture, d, pumping the mixture into a spray drying tower through a plunger pump, igniting the mixture by a burner, heating the mixture to a granulation drying temperature, performing spray granulation, and e, drying and granulating the finished product, and then feeding the finished product into a product storage bin for subpackaging. Sampling tests are performed at steps a, b, e.
The production method of the premelted refining slag used as the raw material for producing the continuous casting covering slag comprises the following steps: 50 wt% of phosphorous slag, 15-17 wt% of solid sodium silicate, 20-25 wt% of wollastonite and 42-45 wt% of sodium carbonate, and the components are prepared according to the given raw materials.
The production method of the premelted refining slag comprises the following process steps: a, weighing the ground raw materials according to a ratio, and drying the raw materials at 150 ℃ after adding 100-; wherein, the phosphorus slag, the solid sodium silicate and the wollastonite need to be ground to be less than 10 meshes in diameter; b, putting the mixture into a storage bin, entering a stirrer after passing through a hoister, stirring and discharging; and C, heating by natural gas and coke kilns or electric arc furnaces, wherein the premelting temperature is 1250 ℃, and D, finally, melting, quenching, drying and grinding to obtain the high-sodium oxide premelted refining slag. And D, melting the premelted product obtained in the step C, then flowing into a cold water pool for quenching, drying the quenched premelted refining slag, and grinding the dried premelted refining slag until the granularity content of 200 meshes is more than 95 wt%, thus obtaining the premelted refining slag for the continuous casting covering slag. The phosphorus slag is the production tailings of yellow phosphorus factories, and is obtained by quenching and granulating a melt which is obtained during the preparation of yellow phosphorus and takes calcium silicate as a main component. The phosphorous slag comprises the following chemical components: SiO 22 36-42％，CaO 40-47％,Al2O3 2-5.5％,Fe2O3 0.2-1.5％,P2O50.6-2.4% of the total weight of the composition and 1.6-2.5% of F. The potential mineral phases of the phosphorous slag are pseudo wollastonite, gunite and 30% or less of apatite, and the structure of the phosphorous slag is more than 90 wt% of vitreous body.
Compared with the original formula of the comparative example, the premelted refining slag added with the phosphorous slag base material has the following changes in production performance after being used: the liquid slag of the casting powder of the original formula has poor stability, uneven heat transfer and poor fluidity, slag strips are easy to form in molten steel, and slag inclusion is easy to form in steel billets. The background technical problem is effectively solved by improving the formula, and the feedback use effect of a certain Korean enterprise client is good. The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention, except for the specific disclosure of the raw material ratio, the process method and conditions of the present invention, other existing process methods and equipment are used to implement the present invention, and those skilled in the art can properly adjust the steps in the embodiments without creative efforts. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (9)
1. The high-sodium oxide premelted refining slag containing phosphorous slag is characterized by comprising the following chemical components in percentage by mass: SiO 22 36-42％,CaO 21-27％,Na2O 26-31％,Al2O3 2-4％。
2. A method for producing the premelted refining slag as the raw material for producing the continuous casting covering slag according to claim 1, which is characterized in that the premelted refining slag is prepared by mixing the raw materials of industrial reagents:
50 wt% of phosphorous slag, 15-17 wt% of solid sodium silicate, 20-25 wt% of wollastonite, 42-45 wt% of sodium carbonate,
prepared according to the raw material composition given above.
3. The method according to claim 2, wherein the raw materials are dried at 100 ℃ and 150 ℃ before being weighed; wherein, the phosphorous slag, the solid sodium silicate and the wollastonite need to be ground to be less than 10 meshes in diameter, then the materials are heated by natural gas and coke kilns or electric furnaces, the premelting temperature is 1000-1300 ℃, and finally the high-sodium oxide premelted refining slag is obtained through melting, quenching, drying and grinding.
4. The production method according to claim 3, wherein the premelting temperature is 1250 ℃.
5. The production method according to claim 2, wherein the phosphorous slag is a production tailings of a yellow phosphorus plant, which is obtained by quenching and granulating a molten material containing calcium silicate as a main component obtained in the production of yellow phosphorus.
6. The production method according to claim 5, wherein the phosphorous slag has a chemical composition of: SiO 22 36-42％，CaO 40-47％,Al2O3 2-5.5％,Fe2O3 0.2-1.5％,P2O5 0.6-2.4％,F1.6-2.5％。
7. The method according to claim 5, wherein the potential mineral phases of the phosphorous slag are pseudo wollastonite, gunite and 30% or less of apatite, and the structure of the potential mineral phases of the phosphorous slag is vitreous body at 90 wt% or more.
8. The production method according to claim 1, wherein the process steps of the production method specifically include:
a. weighing the raw materials after the drying and grinding pretreatment according to a ratio, b, putting the raw materials into a storage bin, lifting the raw materials by a crane, then feeding the raw materials into a raw material stirrer for high-speed stirring, c, pumping the raw materials into a low-speed stirrer for stirring and then sieving, d, pumping the raw materials into a blowing tower through a plunger pump, igniting and heating the raw materials by a burner to a pre-melting temperature, performing spray granulation, e, melting, quenching, drying and grinding the raw materials, and then feeding the raw materials into a product storage bin for subpackaging.
9. The method of claim 8, wherein sampling tests are performed at steps a, b, and e.
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Citations (7)
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|---|---|---|---|---|
| US4738719A (en) * | 1986-05-09 | 1988-04-19 | Tenneco Canada Inc. (Erco Division) | Steel making flux |
| US4991642A (en) * | 1989-02-06 | 1991-02-12 | Stollberg, Inc. | Fluorine-free mold powders |
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| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
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2021
- 2021-09-26 CN CN202111131894.4A patent/CN113828743A/en active Pending
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| US4738719A (en) * | 1986-05-09 | 1988-04-19 | Tenneco Canada Inc. (Erco Division) | Steel making flux |
| US4991642A (en) * | 1989-02-06 | 1991-02-12 | Stollberg, Inc. | Fluorine-free mold powders |
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| CN110976797A (en) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
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