Preparation method of carbon-containing manganese-silicon alloy

Abstract

The invention discloses a preparation method of a carbon-containing manganese-silicon alloy, which comprises the following steps: step 1, before smelting, conveying various raw materials and slagging materials into a preheating bin in proportion, and then preheating the raw materials and the slagging materials; and 2, when the manganese-silicon alloy is smelted, the raw materials are directly conveyed into an electric furnace, and the temperature of the alloy melt is controlled to be 1300-1400 DEG C after electrifying, heating and melting. According to the preparation method of the carbon-containing manganese-silicon alloy, the preheating bin and the waste gas are arranged to preheat the raw materials and the slagging materials, so that the temperature difference between the raw materials and the slagging materials and the electric furnace is reduced, the cooled raw materials and the slagging materials are prevented from exploding after entering the electric furnace, meanwhile, the smelting efficiency can be improved, and the combustion heating time of the electric furnace is shortened; in addition, hot gas discharged by the electric furnace is used for preheating the raw materials and the slagging materials, so that waste heat discharged by the electric furnace is fully utilized, energy loss is reduced, energy consumption is reduced, and cyclic utilization of energy is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of alloy preparation, and in particular to a method for preparing a carbon-containing manganese-silicon alloy. Background Art

[0002] Manganese silicon alloy is widely used in the deoxidation alloying in the later stage of steel smelting and as a reducing agent for smelting low-carbon ferromanganese and other alloys. The traditional smelting method of manganese silicon alloy is to use manganese-rich slag, silica, coke, charcoal, etc. in a one-step continuous production in a submerged arc furnace. It is difficult to produce low-carbon or carbon-free manganese silicon alloy using this production method. In addition, this method uses coke and charcoal as fuel and reducing agent. Most or all of the sulfur and phosphorus in the raw fuel, especially coke and charcoal, are reduced into the alloy. Therefore, in order to control the content of harmful elements such as sulfur and phosphorus in the alloy, the requirements for the raw fuel are very high, and the difficulty of production control is increased. Especially in recent years, with the increasing requirements for controlling the content of impurities such as carbon, sulfur, and phosphorus in the alloy, it is difficult to produce high-purity manganese silicon alloy with the traditional submerged arc furnace process.

[0003] After searching, the existing patent (publication number: CN100457942C) discloses a method for preparing a low-carbon aluminum-manganese-silicon alloy, and the process steps are: the liquid manganese-silicon alloy produced by conventional smelting in a submerged arc furnace is mixed with liquid aluminum in a ratio into a hot exchange bag outside the furnace, and then a modifier cryolite or salt is added, stirring, slag removal, casting, demoulding, analysis, finishing and storage. The low-carbon aluminum-manganese-silicon alloy produced by the method of the present invention can save 800 to 1000 Kw.h / ton of electricity compared with the existing production method, and has good deoxidation effect, is easy to store, does not pulverize, and has significant economic and social benefits.

[0004] Although it can save 800-1000Kw.h / ton of electricity compared with the existing production method, has the advantages of good deoxidation effect, easy storage, no pulverization, and significant economic and social benefits, it has its shortcomings. The purity and uniformity of the alloy produced are not high. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for preparing a carbon-containing manganese-silicon alloy, which solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: A method for preparing a carbon-containing manganese silicon alloy comprises the following steps:

[0007] Step 1: Before smelting, various raw materials and slag materials are transported to the interior of the preheating bin in proportion, and then the raw materials and slag materials are preheated;

[0008] Step 2: When smelting the manganese silicon alloy, the raw materials are directly transported into the electric furnace, and the temperature of the alloy melt is controlled at 1300-1400°C after the power is turned on to heat and melt;

[0009] Step 3: During smelting, the alloy composition needs to be determined. When the manganese content is insufficient, electrolytic manganese is added to adjust the manganese content; when the silicon content is insufficient, industrial silicon is used to adjust the silicon content. When industrial silicon is used to adjust the silicon content, the furnace temperature is controlled at 1430-1500°C to accelerate the melting of silicon;

[0010] Step 4: The exhaust gas discharged after smelting and combustion in the electric furnace is transported to the interior of the preheating bin to preheat the raw materials and slag-making materials, and then the gas passes through the preheating bin into the interior of the exhaust gas treatment equipment;

[0011] Step 5: After the alloy composition is qualified, remove the scum and pour it into a metal mold to form a block of high-purity low-carbon manganese silicon alloy;

[0012] Step 6: Cut the obtained cooled high-purity low-carbon manganese silicon alloy into blocks with a shearing machine to obtain normal alloy blocks; cut the alloy material in the abnormal area and the bottom portion that has not been cast into blocks and place them separately to obtain abnormal alloy blocks; the dimensions of the normal alloy block and the abnormal alloy block are: length × width = 1-5 cm × 1-5 cm;

[0013] Step 7, placing the obtained alloy blocks along the inside of the crucible; wherein, the normal alloy block is placed in the middle position inside the crucible, and the abnormal alloy block is placed around the inside of the crucible;

[0014] Step 8: Heat and melt the crucible, and after evenly melting, cast it into a mold to obtain a high-purity, low-carbon manganese silicon alloy with high uniformity.

[0015] Preferably, the metal mold material includes the following components in weight percentage: Al: 13.0%-16.0%, Fe: 2.0%-4.0%, Mn: 0.8%-1.0%, Re: 0.01%-0.5%, Ti: 0.1%-1.2%, Co: 0.6%-2.0%, and the remainder is Cu, and the total amount is 100%.

[0016] Preferably, before the smelting, the raw materials need to be from the same batch of materials to prevent large fluctuations in quality due to changes in composition, which in turn causes fluctuations in the furnace condition. At the same time, the temperature measurement and spot inspections of the electric furnace and furnace equipment should be strengthened.

[0017] Preferably, the abnormal area is characterized by obvious color difference, uneven surface, and irregular shape; the uncast bottom portion is characterized by protrusions or a large amount of residue.

[0018] Preferably, the waste gas emitted after smelting and combustion in the electric furnace is first subjected to dust removal by dust removal equipment before entering the preheating chamber.

[0019] Beneficial Effects

[0020] The present invention provides a method for preparing a carbon-containing manganese-silicon alloy. Compared with the prior art, the present invention has the following advantages:

[0021] Beneficial effects:

[0022] 1. The preparation method of the carbon-containing manganese silicon alloy preheats the raw materials and slag-making materials by arranging a preheating bin and exhaust gas, which not only reduces the temperature difference between the raw materials and slag-making materials and the electric furnace, and prevents the cooled raw materials and slag-making materials from exploding after entering the electric furnace, but also improves the smelting efficiency and reduces the combustion and heating time of the electric furnace. In addition, since the raw materials and slag-making materials are preheated with the hot gas discharged from the electric furnace, the waste heat of the electric furnace exhaust is fully utilized, thereby reducing energy loss, reducing energy consumption, and realizing energy recycling.

[0023] 2. The preparation method of the carbon-containing manganese silicon alloy can prevent the waste gas from causing pollution by removing and purifying the waste gas discharged after smelting and burning in the furnace through dust removal equipment and waste gas treatment equipment.

[0024] 3. The preparation method of the carbon-containing manganese silicon alloy is as follows: by placing abnormal alloy blocks (generally with high Sc content and high melting point) close to the surroundings and placing normal alloy blocks (generally with relatively low Sc content and low melting point) in the middle position inside the mold, it can be ensured that the high melting point is melted first and then stirred evenly with the low melting point, so that the obtained alloy has better uniformity.

[0025] 4. The preparation method of the carbon-containing manganese silicon alloy reduces the tendency of casting shrinkage, pores, segregation and cracks of the metal mold by adding an appropriate amount of rare earth to the metal mold material. At the same time, the rare earth has a modifying effect on the surface of the metal mold, which significantly improves the oxidation resistance, hydrogen embrittlement resistance, wear resistance and corrosion resistance of the metal mold, and extends the service life of the metal mold.

[0026] 5. The preparation method of the carbon-containing manganese silicon alloy uses electrolytic manganese and industrial silicon as raw materials to melt the manganese silicon alloy in a medium frequency induction furnace in one step, replacing the traditional submerged arc furnace reduction smelting process, and does not use reducing agents such as coke. Therefore, the content of impurity elements such as carbon, sulfur, and phosphorus in the alloy is significantly reduced, meeting the requirements of high-purity manganese silicon alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 The present invention provides a technical solution: a preparation method of a carbon-containing manganese silicon alloy, comprising the following steps: step 1, before smelting, various raw materials and slag materials are transported to the interior of a preheating bin in proportion, and then the raw materials and slag materials are preheated; step 2, when smelting the manganese silicon alloy, the raw materials are directly transported into an electric furnace, and the temperature of the alloy melt is controlled at 1300-1400°C after power is turned on to melt; step 3, the alloy composition needs to be determined during smelting, and electrolytic manganese is added to adjust the manganese content when the manganese content is insufficient; when the silicon content is insufficient, the silicon content is adjusted with industrial silicon, and when the silicon content is adjusted with industrial silicon, the furnace temperature is controlled at 1430-1500°C to accelerate the melting of silicon; step 4, the exhaust gas discharged after smelting and combustion in the electric furnace is transported to the interior of the preheating bin to preheat the raw materials and slag materials, and then the gas passes through the preheating bin. The warehouse enters the interior of the exhaust gas treatment equipment; Step 5, after the alloy composition is qualified, remove the scum and pour it into a metal mold to form a block of high-purity low-carbon manganese silicon alloy; Step 6, the obtained cooled high-purity low-carbon manganese silicon alloy is sheared into blocks with a shearing machine to obtain a normal alloy block; the alloy material in the abnormal area and the bottom part that has not been cast out is sheared into blocks and placed separately to obtain an abnormal alloy block; the dimensions of the normal alloy block and the abnormal alloy block are: length × width = 1-5cm × 1-5cm; Step 7, the obtained alloy blocks are placed along the inside of the crucible; wherein the normal alloy block is placed in the middle position inside the crucible, and the abnormal alloy block is placed around the inside of the crucible; Step 8, the crucible is heated and smelted, and after melting evenly, it is cast into a mold to obtain a high-purity low-carbon manganese silicon alloy with high uniformity;

[0030] The raw materials and slag-making materials are preheated by setting a preheating bin and exhaust gas, which not only reduces the temperature difference between the raw materials and slag-making materials and the electric furnace, and prevents the cooled raw materials and slag-making materials from exploding after entering the electric furnace, but also improves the efficiency of smelting and reduces the combustion and heating time of the electric furnace. In addition, since the raw materials and slag-making materials are preheated by the hot gas discharged from the electric furnace, the waste heat of the electric furnace exhaust is fully utilized, energy loss is reduced, energy consumption is reduced, and energy recycling is realized; and by placing abnormal alloy blocks (generally high Sc content and high melting point) close to the surroundings and normal alloy blocks (generally relatively low Sc content and low melting point) in the middle position inside the mold, it can be ensured that the high melting point is melted first and then mixed evenly with the low melting point, so that the uniformity of the obtained alloy is better; and by using electrolytic manganese and industrial silicon as raw materials to melt manganese silicon alloy in a one-step method in a medium frequency induction furnace, replacing the traditional ore-heat furnace reduction smelting process, without using reducing agents such as coke, the content of impurity elements such as carbon, sulfur, and phosphorus in the alloy is significantly reduced, meeting the requirements of high-purity manganese silicon alloy.

[0031] Furthermore, the metal mold material includes the following components in weight percentage: Al: 13.0%-16.0%, Fe: 2.0%-4.0%, Mn: 0.8%-1.0%, Re: 0.01%-0.5%, Ti: 0.1%-1.2%, Co: 0.6%-2.0%, and the balance is Cu, the total amount is 100%;

[0032] By adding an appropriate amount of rare earth to the metal mold material, the tendency of casting shrinkage, pores, segregation and cracks in the metal mold is reduced. At the same time, rare earth has a modifying effect on the surface of the metal mold, which significantly improves the metal mold's oxidation resistance, hydrogen embrittlement resistance, wear resistance, and corrosion resistance, and extends the service life of the metal mold.

[0033] Furthermore, before the smelting, the raw materials need to be made from the same batch of materials to prevent the composition change from causing large fluctuations in quality, which in turn causes fluctuations in the furnace condition. At the same time, the temperature measurement and point inspection of the furnace and furnace equipment should be strengthened;

[0034] This allows the smelting to proceed normally and prevents abnormalities during smelting.

[0035] Furthermore, the characteristics of the abnormal area are: obvious color difference, uneven surface, and irregular shape; the characteristics of the uncast bottom part are: there are protrusions or a lot of residues.

[0036] Furthermore, the waste gas discharged after smelting and combustion in the electric furnace is first subjected to dust removal by dust removal equipment before entering the preheating chamber;

[0037] The waste gas emitted after smelting and combustion in the furnace is dedusted and purified by dust removal equipment and waste gas treatment equipment, which can prevent the waste gas from causing pollution.

[0038] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a carbon-containing manganese-silicon alloy, characterized in that: The following steps are involved: Step 1: Before smelting, various raw materials and slag materials are transported to the interior of the preheating bin in proportion, and then the raw materials and slag materials are preheated; Step 2: When smelting the manganese silicon alloy, the raw materials are directly transported into the electric furnace, and the temperature of the alloy melt is controlled at 1300-1400°C after the power is turned on to heat and melt; Step 3: During smelting, the alloy composition needs to be determined. When the manganese content is insufficient, electrolytic manganese is added to adjust the manganese content; when the silicon content is insufficient, industrial silicon is used to adjust the silicon content. When industrial silicon is used to adjust the silicon content, the furnace temperature is controlled at 1430-1500°C to accelerate the melting of silicon; Step 4: The exhaust gas discharged after smelting and combustion in the electric furnace is transported to the interior of the preheating bin to preheat the raw materials and slag-making materials, and then the gas passes through the preheating bin into the interior of the exhaust gas treatment equipment; Step 5: After the alloy composition is qualified, remove the scum and pour it into a metal mold to form a block of high-purity low-carbon manganese silicon alloy; Step 6: Cut the obtained cooled high-purity low-carbon manganese silicon alloy into blocks with a shearing machine to obtain normal alloy blocks; cut the alloy material in the abnormal area and the bottom portion that has not been cast into blocks and place them separately to obtain abnormal alloy blocks; the dimensions of the normal alloy block and the abnormal alloy block are: length × width = 1-5 cm × 1-5 cm; Step 7, placing the obtained alloy blocks along the inside of the crucible; wherein, the normal alloy block is placed in the middle position inside the crucible, and the abnormal alloy block is placed around the inside of the crucible; Step 8: Heat and melt the crucible, and after evenly melting, cast it into a mold to obtain a high-purity, low-carbon manganese silicon alloy with high uniformity.

2. The method for preparing a carbon-containing manganese-silicon alloy according to claim 1, characterized in that: The metal mold material includes the following components in weight percentage: Al: 13.0%-16.0%, Fe: 2.0%-4.0%, Mn: 0.8%-1.0%, Re: 0.01%-0.5%, Ti: 0.1%-1.2%, Co: 0.6%-2.0%, and the balance is Cu, and the total amount is 100%.

3. The method for preparing a carbon-containing manganese-silicon alloy according to claim 2, characterized in that: Before the smelting, the raw materials need to be from the same batch to prevent large fluctuations in quality due to changes in composition, which in turn causes fluctuations in the furnace condition. At the same time, the temperature measurement and spot inspections of the furnace and furnace equipment should be strengthened.

4. The method for preparing a carbon-containing manganese-silicon alloy according to claim 3, characterized in that: The characteristics of the abnormal area are: obvious color difference, uneven surface, and irregular shape; the characteristics of the uncast bottom part are: protrusions or a lot of residues.

5. The method for preparing a carbon-containing manganese-silicon alloy according to claim 4, characterized in that: Before the waste gas discharged after smelting and combustion in the electric furnace enters the preheating chamber, it is first dedusted by dust removal equipment.

Images