CN111944949A - Manganese-silicon composite additive and preparation method thereof - Google Patents
Manganese-silicon composite additive and preparation method thereof Download PDFInfo
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- CN111944949A CN111944949A CN202010745695.1A CN202010745695A CN111944949A CN 111944949 A CN111944949 A CN 111944949A CN 202010745695 A CN202010745695 A CN 202010745695A CN 111944949 A CN111944949 A CN 111944949A
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- silicon composite
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- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 239000000654 additive Substances 0.000 title claims abstract description 63
- 239000002131 composite material Substances 0.000 title claims abstract description 63
- 230000000996 additive effect Effects 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims description 11
- 229910000914 Mn alloy Inorganic materials 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 21
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 21
- 239000004094 surface-active agent Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 28
- 238000005245 sintering Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 21
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 17
- 229910052700 potassium Inorganic materials 0.000 claims description 17
- 239000011591 potassium Substances 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000009766 low-temperature sintering Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- 150000002222 fluorine compounds Chemical group 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 82
- 229910052742 iron Inorganic materials 0.000 abstract description 41
- 238000002844 melting Methods 0.000 abstract description 40
- 230000008018 melting Effects 0.000 abstract description 40
- 229910000831 Steel Inorganic materials 0.000 abstract description 32
- 239000010959 steel Substances 0.000 abstract description 32
- 229910052748 manganese Inorganic materials 0.000 abstract description 17
- 239000011572 manganese Substances 0.000 abstract description 17
- 229910052710 silicon Inorganic materials 0.000 abstract description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 16
- 238000011084 recovery Methods 0.000 abstract description 16
- 239000010703 silicon Substances 0.000 abstract description 16
- 238000009628 steelmaking Methods 0.000 abstract description 10
- 238000003723 Smelting Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C22/00—Alloys based on manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of metal smelting, and particularly relates to a manganese-silicon composite additive which comprises the following raw materials in percentage by mass: 93-96% of silicon-manganese alloy, 3-5% of liquid sodium silicate, 0.5-1.2% of fluxing agent and 0.4-0.8% of surfactant; the density of the manganese-silicon composite additive is controlled to be 4-6g/cm3. The manganese-silicon composite additive is prepared by utilizing a silicon-manganese alloy, liquid sodium silicate, a fluxing agent and a surfactant, so that the manganese-silicon composite additive can be fully melted during steel making, the recovery rate of manganese is over 99.5 percent, and the recovery rate of silicon is over 99.1 percent. In addition, compared with the traditional silicon-manganese alloy iron, the manganese-silicon composite additive can be melted more quickly, the required melting temperature is lower, and compared with the traditional silicon-manganese alloy iron, the melting temperature is reduced from 1650 ℃ to 1580 ℃, and the 70 ℃ melting temperature can be realizedThe cost can be reduced by 70 yuan per ton of steel, and the cost is greatly saved.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and particularly relates to a manganese-silicon composite additive and a preparation method thereof.
Background
Steelmaking refers to controlling the carbon content (generally less than 2%), eliminating P, S, O, N and other harmful elements, retaining or increasing Si, Mn, Ni, Cr and other beneficial elements and adjusting the proportion among the elements to obtain the best performance. The pig iron for steel making is put into a steel making furnace to be smelted according to a certain process, and the steel is obtained.
In the steel-making process, different elements can be added according to the requirements of different kinds of steel so as to ensure that the steel meets the requirements, silicon and manganese are common addition raw materials, and proper amounts of manganese and silicon are addedCan improve the strength, mechanical property, wear resistance, toughness and other properties of the steel. In the existing steel-making process, the traditional silicon-manganese alloy iron (usually silicon-manganese alloy 6517) is usually added for supplementing manganese and silicon elements. The inventor finds that the traditional silicon manganese alloy iron has non-uniform granularity, difficult size control and higher density, and the density is usually 7.4-7.6g/cm3When the alloy is put into a converter water outlet ladle or an electric furnace, the melting temperature of about 1650 ℃ is usually needed to ensure that the silicon-manganese alloy iron is fully melted as much as possible, and the melting temperature is higher. In actual production, the melting temperature is increased by 1 ℃, the cost of a steel plant is increased by about 1 yuan/ton, and if the melting temperature can be reduced, great economic benefit can be brought to the steel plant. In addition, the traditional silicon-manganese alloy iron is used for supplementing manganese and silicon elements during steel making, the recovery rate of manganese is about 92%, the recovery rate of silicon is about 91.5%, and the recovery rates of manganese and silicon are not high, so that the relatively large resource waste is caused.
Disclosure of Invention
The invention aims to provide a manganese-silicon composite additive and a preparation method thereof, and aims to solve the problems of high melting temperature and non-uniform melting of the traditional silicon-manganese alloy iron.
In order to achieve the purpose, the scheme of the invention is as follows: the manganese-silicon composite additive comprises 93-96% of silicon-manganese alloy, 3-5% of liquid sodium silicate, 0.5-1.2% of fluxing agent and 0.4-0.8% of surfactant; the density of the manganese-silicon composite additive is controlled to be 4-6g/cm3。
The working principle and the beneficial effects of the scheme are as follows:
the liquid sodium silicate can bond materials such as silicon-manganese alloy, fluxing agent, surfactant and the like together to form a firmer whole, and besides, the liquid sodium silicate can also accelerate the melting of the manganese-silicon composite additive, shorten the melting time, improve the efficiency and reduce the energy consumption. The fluxing agent can quickly melt the manganese-silicon composite additive in the molten steel, improve the melting efficiency, uniformly distribute the melted materials in the molten steel, and simultaneously reduce the melting temperature of the manganese-silicon composite additive to a certain extent. The addition of the surfactant can reduce the sinking speed of the manganese-silicon composite additive, and prolong the retention speed of the manganese-silicon composite additive in molten steel, so that the manganese-silicon composite additive can be more quickly and fully melted, and the melting efficiency is obviously improved.
The manganese-silicon composite additive is prepared by utilizing a silicon-manganese alloy, liquid sodium silicate, a fluxing agent and a surfactant, and is put into molten steel during steelmaking, the manganese-silicon composite additive slowly sinks, the sinking speed is obviously slower than that of the traditional silicon-manganese alloy iron, so that the manganese-silicon composite additive can be fully melted, the recovery rate of manganese reaches over 99.5 percent, and the recovery rate of silicon reaches over 99.1 percent. In addition, materials such as a fluxing agent and liquid sodium silicate are added, and the density of the manganese-silicon composite additive is controlled, so that the manganese-silicon composite additive can be melted more quickly than the traditional silicon-manganese alloy iron, the required melting temperature is lower, the melting temperature needs to be controlled to be about 1650 ℃ by using the traditional silicon-manganese alloy iron, and the melting temperature only needs to be controlled to be about 1580 ℃ by using the manganese-silicon composite additive. The melting temperature is reduced from 1650 ℃ to 1580 ℃, the reduction of the melting temperature of 70 ℃ can be realized, the cost of each ton of steel can be reduced by 70 yuan, and the cost is greatly saved.
Optionally, the fluxing agent is a fluoride. The inventor finds in the practical research process that the fluoride is used as the fluxing agent, so that the prepared manganese-silicon composite additive can be effectively and rapidly melted, and the melting temperature can be reduced.
Optionally, the fluxing agent is one or more of potassium fluoborate, potassium fluotitanate, potassium fluosilicate and potassium fluoroaluminate. After long-time research, the potassium fluoborate, the potassium fluotitanate, the potassium fluosilicate, the potassium fluoaluminate and other substances are used as the fluxing agent with better effect.
Optionally, the surfactant is sodium dodecylbenzenesulfonate. Long-time research proves that the effect of selecting sodium dodecyl benzene sulfonate as the surfactant is relatively good.
The invention also provides a preparation method of the manganese-silicon composite additive, which comprises the following preparation steps:
(1) preparing the following raw materials in parts by mass: 93-96% of silicon-manganese alloy, 3-5% of liquid sodium silicate, 0.5-1.2% of fluxing agent and 0.4-0.8% of surfactant;
(2) crushing the silicon-manganese alloy, and controlling the particle size of the silicon-manganese alloy to be less than 20 mm;
(3) mixing materials: mixing and stirring the silicon-manganese alloy treated in the step (2) with all liquid sodium silicate, fluxing agent and surfactant to uniformly mix the materials to obtain a mixture;
(4) pressing the mixture to make the mixture pressed and formed, and controlling the density of the mixture at 4-6g/cm3Controlling the pressure in the pressing process to be 22-28 Mpa;
(5) putting the mixture into a container containing liquid sodium silicate solution for soaking;
(6) and sintering the soaked mixture to obtain a manganese-silicon composite additive finished product.
As described in the background art, the conventional silicon-manganese alloy iron is used to supplement silicon and manganese elements, and in order to melt the silicon-manganese alloy iron as sufficiently as possible, the melting temperature needs to be controlled to be about 1650 ℃, and since the melting temperature is increased by 1 ℃, the cost of a steel mill is increased by about 1 yuan/ton steel, and the high melting temperature causes high production cost. Even if the melting temperature is controlled to 1650 ℃, the effect of melting the silicon-manganese alloy iron is not very ideal, the recovery rate of manganese is about 92 percent, the recovery rate of silicon is about 91.5 percent, and the recovery rates of manganese and silicon are not high, thereby causing great resource waste.
In order to solve the above problems, the inventors studied a plurality of technical solutions. In order to melt the silicon-manganese alloy iron more quickly and sufficiently, the inventor tries to mix the silicon-manganese alloy with the fluxing agent, and the fluxing agent is utilized to accelerate the melting of the silicon-manganese alloy iron to a certain extent so as to ensure that the silicon-manganese alloy iron is melted more sufficiently, but the effect is not ideal; if the amount of flux used is increased in order to improve the effect of fluxing, significant impurities are introduced into the molten steel, and the properties of the steel are degraded.
The inventors have further studied and studied without limiting the effects of the addition of the flux, and have made extensive assumptions. The density of the traditional silicon-manganese alloy iron is 7.4-7.6g/cm3The density is higher, the internal structure of the silicon-manganese alloy iron is compact, and the high melting temperature and the high time consumption are probably caused for fully melting the silicon-manganese alloy iron. Based on this, the inventors wanted to control the melting temperature by controlling the density of the manganese silicon composite additive. In fact, it is difficult to control the melting temperature by controlling the density of the mn-si composite additive at will. The density of the manganese-silicon composite additive is controlled at will, preferably, the silicon-manganese alloy iron is ground into powder with smaller particle size, then the powder material is pressed, the density inside the material is controlled by controlling the pressing pressure, and the density is increased when the material is more compact. The inventor verifies the influence of the density of the manganese-silicon composite additive on the melting temperature from large to small (namely, the pressure applied during pressing is from large to small) one by one. First, the inventors ground a silicon-manganese alloy into powder, bonded the powder silicon-manganese alloy with a binder to form it, and then pressed it into a mass by applying a suitable pressure, and the applied pressure was too large, and the obtained mass had a large density, a dense internal structure, and no significant decrease in melting temperature, and when the pressure was too small, although the mass could be melted at a relatively low melting temperature, the obtained mass was not strong and easily broken, and the product yield was low. And no matter the pressure of pressing is large or small, when the pressed group is put into molten steel, the burning loss of materials is serious, and the burning loss is serious when the density is smaller, so that the recovery rate of manganese and silicon is low. As a result of intensive research and analysis, the burning loss of the material is serious because the pressed mass is not very firm (the amount of binder is limited, and impurities are introduced due to excessive amount of binder), and when the mass is poured into molten steel, the powdery material is easily peeled off from the surface, and the peeled material is burned off due to the extremely high temperature of the molten steel, resulting in a loss of whiteness.
The inventors did not compromise on choosing a relatively superior solution, but rather studied further. Although the control of the density of the final product is influenced by the overlarge grain diameter of the silicon-manganese alloyHowever, the inventors tried to adjust the grain size of the silicon-manganese alloy, and after long-term research and experiments, found that the grain size of the silicon-manganese alloy was controlled to 20mm or less (the materials were well bonded together by using a proper amount of binder, and the pressed bodies were soaked in a liquid sodium silicate solution after pressing to reduce burning loss), and the pressed bodies were pressed (the density of the bodies was 4-6g/cm at this time) while the pressure during pressing was controlled to 22-28Mpa3) The material can be better melted by relatively lower melting temperature after being put into molten steel, so that the production cost is better saved.
The inventor also found a problem in the research process that after the traditional silicon-manganese alloy iron is put into molten steel, the silicon-manganese alloy iron sinks fast, the silicon-manganese alloy iron sinks to the furnace bottom without being completely melted, when the silicon-manganese alloy iron is deposited on the furnace bottom, the silicon-manganese alloy iron is stacked, the heating is insufficient and uneven, and the silicon-manganese alloy iron is not easy to melt. In order to make the silicon-manganese alloy iron easier to melt, the inventor stirs the silicon-manganese alloy iron at the furnace bottom, but because the silicon-manganese alloy iron is solid with relatively large grain size, namely, the silicon-manganese alloy iron is difficult to lift up by stirring, although the stirring can accelerate the melting of the silicon-manganese alloy iron to a certain extent, the effect is not obvious. Because the silicon-manganese alloy iron can fully contact with the molten steel in the sinking process, the silicon-manganese alloy iron is fully and relatively uniformly heated and is easier to melt, the inventor thinks that if the descending speed of the silicon-manganese alloy iron can be reduced, the silicon-manganese alloy iron is fully melted in the sinking process, the melting speed can be improved, and the silicon-manganese alloy iron can be prevented from being accumulated on the furnace bottom. Based on the above, the applicant tries various methods to reduce the sedimentation velocity of the silicon-manganese alloy iron, and finally obtains a scheme of reducing the sedimentation velocity by adding a surfactant, and the verification proves that the effect is better.
According to the scheme, silicon-manganese alloy, liquid sodium silicate, fluxing agent and surfactant are used as raw materials, the density of the manganese-silicon composite additive is controlled within a proper range through a technical means, the prepared manganese-silicon composite additive slowly sinks and is quickly melted when being put into molten steel, the manganese-silicon composite additive can be fully melted at about 1580 ℃, the recovery rate of manganese reaches more than 99.5%, the recovery rate of silicon reaches more than 99.1%, and compared with the traditional silicon-manganese alloy iron, the recovery rates of manganese and silicon are greatly improved, and the waste of resources is effectively reduced. And because the melting temperature is only controlled to be about 1580 ℃, the melting temperature is reduced from 1650 ℃ to 1580 ℃, the reduction of the melting temperature of 70 ℃ can be realized, the cost of each ton of steel can be reduced by 70 yuan, and the cost is greatly saved.
Optionally, the density of the mixture is controlled to 4.5-5.5g/cm3. Controlling the density of the mixture at 4.5-5.5g/cm3The melting temperature and the descending speed of the manganese-silicon composite additive can be reduced to a certain extent, so that the manganese-silicon composite additive is more fully and effectively melted, and the burning loss degree of the manganese-silicon composite additive can be effectively controlled.
Optionally, in the step (4), the mixture is pressed into an ellipsoid shape, the width of the ellipsoid shape is controlled to be 10-80mm, and the length is controlled to be 10-100 mm. The size specification of the manganese-silicon composite additive is controlled within the range, the manganese-silicon composite additive is proper in size, and the manganese-silicon composite additive can be rapidly melted after molten steel is put into the manganese-silicon composite additive.
Optionally, in the step (5), the soaking time is controlled to be 25-35 s. In the long-term production process, the soaking time is controlled to be 25-35s, which is found to be suitable.
Optionally, nitrogen is introduced for protection during the process of sintering the mixture. In the past, vanadium has been added to molten steel in order to improve the properties of steel such as strength and wear resistance. In the scheme, nitrogen is filled in the sintering process, the mixture can be protected against oxidation, the nitrogen content in the prepared manganese-silicon composite additive can be increased by filling the nitrogen, the nitrogen content of the manganese-silicon composite additive is 2 times of that of common silicon-manganese alloy iron, the manganese-silicon composite additive is added into molten steel, the nitrogen can be combined with Ti and Al of the molten steel at high temperature, the generated TiN and AlN are beneficial to increasing the strength of steel, vanadium does not need to be additionally added into the molten steel to improve the performance of the steel, and the production cost is greatly reduced.
Optionally, in the step (6), the sintering process is divided into low-temperature sintering, medium-temperature sintering and high-temperature sintering, wherein the temperature of the low-temperature sintering is controlled at 200 ℃ and 300 ℃, and the time is controlled at 2.8-3.2 h; the temperature of the medium-temperature sintering is controlled to be 420-; the temperature of the high-temperature sintering is controlled at 650-700 ℃, and the time is controlled at 2.8-3.2 h. In practice, the sintering at three stages of low temperature, medium temperature and high temperature is found to effectively convert the powdery material into a compact body and effectively prevent the material on the manganese-silicon composite additive from falling.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
the manganese-silicon composite additive and the method for preparing the same will be described in detail below by taking example 1 as an example, and other examples are shown in table 1, and the portions not shown are the same as those in example 1.
Example one
The manganese-silicon composite additive comprises the following raw materials in percentage by mass: 94.8 percent of silicon-manganese alloy, 4 percent of liquid sodium silicate, 0.7 percent of fluxing agent and 0.5 percent of surfactant. The density of the manganese-silicon composite additive is controlled to be 4.8-5.3g/cm3. The fluxing agent is fluoride, and can be one or more of potassium fluoborate, potassium fluotitanate, potassium fluosilicate and potassium fluoaluminate, and in the implementation, the fluxing agent is selected from potassium fluoaluminate. In the implementation, the surfactant is sodium dodecyl benzene sulfonate, and the liquid sodium silicate is produced by Hebei Riyi chemical engineering Co.
The embodiment also provides a preparation method of the manganese-silicon composite additive, which comprises the following preparation steps:
(1) preparing the following raw materials in parts by mass: 94.8 percent of silicon-manganese alloy, 4 percent of liquid sodium silicate, 0.7 percent of fluxing agent and 0.5 percent of surfactant;
(2) crushing the silicon-manganese alloy, and controlling the particle size of the silicon-manganese alloy to be less than 20 mm;
(3) mixing materials: mixing and stirring the silicon-manganese alloy treated in the step (2) with all liquid sodium silicate, fluxing agent and surfactant to uniformly mix the materials to obtain a mixture;
(4) pressing the mixture to form an ellipsoid shape, wherein the width of the ellipsoid shape is controlled to be 20-50mm, and the length of the ellipsoid shape is controlled to be 30-60 mm; controlling the density of the mixture at 4.8-5.3g/cm3(ii) a The pressure during pressing was controlled at 25 MPa.
(5) Putting the mixture formed by pressing into a container containing liquid sodium silicate solution for soaking for 30 s;
(6) sintering the soaked mixture, and introducing nitrogen for protection in the sintering process. The sintering process is divided into three stages of low-temperature sintering, medium-temperature sintering and high-temperature sintering, wherein the temperature of the low-temperature sintering is controlled at 250 ℃, and the time is controlled at 3 hours; the temperature of the medium-temperature sintering is controlled at 450 ℃, and the time is controlled at 3 h; the temperature of high-temperature sintering is controlled at 700 ℃, and the time is controlled at 3 h.
TABLE 1
The data obtained by searching the specific elemental components of the manganese-silicon composite additives prepared in examples 1 to 4 are shown in table 2:
TABLE 2
The manganese-silicon composite additive prepared in examples 1-4 and conventional silicon-manganese alloy iron (silicon-manganese alloy 6517) were used for steel making, and the recovery rates of manganese and silicon are shown in table 3:
TABLE 3
As is apparent from the data in Table 3, the recovery rates of manganese and silicon in the steel making process using the manganese-silicon composite additive prepared by the method are obviously higher than those of the conventional silicon-manganese alloy iron.
Claims (10)
1. The manganese-silicon composite additive is characterized in that: the material comprises the following raw materials in percentage by mass: 93-96% of silicon-manganese alloy, 3-5% of liquid sodium silicate, 0.5-1.2% of fluxing agent and surfactant0.4 to 0.8 percent; the density of the manganese-silicon composite additive is controlled to be 4-6g/cm3。
2. The manganese-silicon composite additive according to claim 1, wherein: the fluxing agent is fluoride.
3. The manganese-silicon composite additive according to claim 2, wherein: the fluxing agent is one or more of potassium fluoborate, potassium fluotitanate, potassium fluosilicate and potassium fluoaluminate.
4. The manganese-silicon composite additive according to any one of claims 1 to 3, wherein: the surfactant is sodium dodecyl benzene sulfonate.
5. The preparation method of the manganese-silicon composite additive is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
(1) preparing the following raw materials in parts by mass: 93-96% of silicon-manganese alloy, 3-5% of liquid sodium silicate, 0.5-1.2% of fluxing agent and 0.4-0.8% of surfactant;
(2) crushing the silicon-manganese alloy, and controlling the particle size of the silicon-manganese alloy to be less than 20 mm;
(3) mixing materials: mixing and stirring the silicon-manganese alloy treated in the step (2) with all liquid sodium silicate, fluxing agent and surfactant to uniformly mix the materials to obtain a mixture;
(4) pressing the mixture to make the mixture pressed and formed, and controlling the density of the mixture at 4-6g/cm3Controlling the pressure in the pressing process to be 22-28 Mpa;
(5) putting the mixture into a container containing liquid sodium silicate solution for soaking;
(6) and sintering the soaked mixture to obtain a manganese-silicon composite additive finished product.
6. The method of claim 5, wherein the manganese-silicon composite additive is prepared by: controlling the density of the mixture at 4.5-5.5g/cm3。
7. The method of claim 6, wherein the manganese-silicon composite additive is prepared by: in the step (4), the mixture is pressed into an ellipsoid shape, the width of the ellipsoid shape is controlled to be 10-80mm, and the length is controlled to be 10-100 mm.
8. The method for preparing the manganese-silicon composite additive according to claim 7, wherein: in the step (5), the soaking time is controlled to be 25-35 s.
9. The method for preparing a manganese-silicon composite additive according to any one of claims 5 to 8, characterized in that: and introducing nitrogen for protection in the process of sintering the mixture.
10. The method for preparing the manganese-silicon composite additive according to claim 9, wherein: in the step (6), the sintering process is divided into low-temperature sintering, medium-temperature sintering and high-temperature sintering, wherein the temperature of the low-temperature sintering is controlled at 200-300 ℃, and the time is controlled at 2.8-3.2 h; the temperature of the medium-temperature sintering is controlled to be 420-; the temperature of the high-temperature sintering is controlled at 650-700 ℃, and the time is controlled at 2.8-3.2 h.
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Denomination of invention: Manganese silicon composite additive and its preparation method Granted publication date: 20221129 Pledgee: Chongqing Branch of China Everbright Bank Co.,Ltd. Pledgor: CHONGQING RUNJI FAR EAST NEW MATERIAL TECHNOLOGY CO.,LTD. Registration number: Y2024500000027 |