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Fluorine-free protecting slag for high-speed continuous casting crystallizer
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A continuous casting mold and mold flux technology, applied in the field of iron and steel smelting and continuous casting production, can solve problems such as damage to the health of operators, corrosion of equipment, and pollution of secondary cold water, so as not to damage the health of operators, reduce processing and manufacturing costs, and prolong The effect of equipment life
Inactive Publication Date: 2014-02-12
JIANGSU UNIV
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[0002]The continuous casting technology has been highly valued by the metallurgical industry for its high efficiency, energy saving, high quality, easy automation and intelligence, and many other advantages. Mold slag has also been developed accordingly and has become an indispensable metallurgical auxiliary material; the existing continuous casting mold slag mainly uses SiO2-Al2O3-CaO slag system, on this basis, add a small amount of flux (alkali metal or alkaline earth metaloxide, fluoride, boride, etc.) and carbonaceous materials (carbon black, graphite and coke, etc.), this type of mold flux has a lower melting point and viscosity, and has the advantages of glass slag lubricating effect and good effect of absorbing inclusions, but the current SiO2-Al2O3-CaO series mold flux In order to ensure a low melting temperature, the added fluoride, Na, K oxides or salts will cause certain pollution, which will not only damage the health of operators , will also corrode equipment and cause secondary cooling water pollution; for high-speed continuous casting, it is necessary to use mold slag with faster melting speed and lower viscosity, which requires adding more fluoride, Na, K oxides or salts to help Flux, which not only causes greater pollution, but also because these substances are non-reticular substances, it will significantly increase the crystallization temperature of the mold slag, which will cause premature crystallization of the mold slag, and its lubricating effect will deteriorate, so that it cannot be used Used in high-speed continuous casting mold
[0003] For high-speed continuous casting mold slag, in the process of developing high-efficiency continuous casting mold slag in China, it is proposed to use boronoxide as a flux or to enhance the vitrification of slag However, the cost of adding boric anhydride to boron-containing slag is high, and when borax is added, Na salt will be brought in; Li2O can effectively reduce silicic acid The effect of the melting point and viscosity of calcium or calciumaluminate slag system, therefore, in the high-speed continuous casting mold flux can be used as a component to adjust the performance of the slag, but the Li2O is added in the form of Li2O or Li2CO3 which is very expensive, so this Li The cost of mold flux of 2O is very high; at the same time, spodumene is one of the main minerals with high content of Li2O in nature. However, spodumene In addition to 3-8% Li2O, it also contains a large amount of SiO2 and Al2O3 , the cost of separating Li2O from spodumene is very high, especially for lower-grade spodumene minerals, the cost of separating Li2O is higher , therefore, for the spodumene mineral, it is also necessary to develop a low-cost utilization method; SiO2 and Al2O in spodumene 3 is also the main component of mold flux. Therefore, considering how to use spodumene in high-speed continuous casting mold flux is a feasible way to improve the performance of mold flux and reduce the cost of mold flux and spodumene mineral treatment. One of the options
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[0029] The composition characteristic of the preparation process of embodiment and the raw material that adopts is as follows:
[0030] Preparation method: first fully dry and dehydrate spodumene powder, lime powder, wollastonite powder and silica powder, then weigh the ingredients according to the weight fraction, pre-melt at 1300-1400 °C, cool the pre-melted slag, crush and make powder, the particle size is Below 200 mesh, add carbonaceous material coke powder and then grind and mix until fine. The particle size of the mixed material is below 200 mesh, and then use spray towergranulation to make hollow particles. The particle size range of mold powder is 0.1-0.4mm .
[0031] The composition characteristics of the raw materials used are as follows:
[0032] The composition of spodumene is calculated by mass percentage, and the requirements are: Li 2 O 5.0%, Al 2 o 3 19.4%, SiO 2 74%, Na 2 O 0.24%, K 2 O 0.28%, CaO 0.11%, MnO 0.04%, TiO 2 0.02%, P 2 o 5 0.09%, a...
Embodiment 1
[0038] The formula used is: spodumene powder 50%, lime powder 40%, silica powder 5%, coke powder 5%.
[0039] The composition analysis results of the prepared mold flux are as follows (mass percentage):
[0040] Li 2 O 2.5%, CaO 36.5%, SiO 2 41%, Al 2 o 3 10.0%, C 4.8%, and the balance is impurities, of which S 0.02%, P 0.02%.
[0041] The main composition indexes of this embodiment are shown in Table 3.
[0042] The main physical and chemical performance indicators of this embodiment are shown in Table 4.
Embodiment 2
[0044] The formula used is: spodumene powder 40%, lime powder 40%, wollastonite powder 10%, silica powder 5%, coke powder 5%.
[0045] The composition analysis results of the prepared mold flux are as follows (mass percentage):
[0046] Li 2 O 2.0%, CaO 40.5%, SiO 2 40.5%, Al 2 o 3 9.6%, C 4.8%, and the balance is impurities, of which S 0.02%, P 0.02%.
[0047] The main composition indexes of this embodiment are shown in Table 3.
[0048] The main physical and chemical performance indicators of this embodiment are shown in Table 4.
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Abstract
The invention belongs to the technical field of continuous casting production of steel smelting, and particularly relates to a fluorine-free protecting slag for a high-speed continuous casting crystallizer. The invention aims to provide a fluorine-free protecting slag for a high-speed continuous casting crystallizer; according to the ore phase composition and characteristics of the existing spodumene and the performance requirements for the protecting slag in using the high-speed continuous casting crystallizer, corresponding components are added to perform combination and matching, thereby ensuring and enhancing the service performance of the protecting slag, lowering the production cost of the protecting slag and implementing low-cost treatment and utilization of the spodumene ores. The invention is characterized in that the fluorine-free protecting slag is prepared from the following raw materials in percentage by weight: 40-60% of spodumenepowder, 30-50% of limepowder, 0-10% of wollastonitepowder, 0-10% of silica powder and 0-10% of coke powder.
Description
technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting production, and in particular relates to a fluorine-free mold slag for a high-speed continuous casting crystallizer. Background technique [0002] The continuous casting technology has been highly valued by the metallurgical industry for its advantages of high efficiency, energy saving, high quality, easy automation and intelligence, etc., and the matching continuous casting mold powder has also been developed accordingly, and has become an indispensable Metallurgical auxiliary materials; the existing continuous casting mold flux mainly uses SiO 2 -Al 2 o 3 -CaO slag system, on this basis, add a small amount of flux (alkali metal or alkaline earth metaloxide, fluoride, boride, etc.) and carbonaceous materials (carbon black, graphite, coke, etc.) Slag has a lower melting point and viscosity, and has the advantages of glass slag lubricating effect and good ...
Claims
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Application Information
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