JPS63503312A - Process for refining eutectic aluminum-silicon alloys from iron and titanium impurities - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Process for refining aluminum-silicon alloys with eutectic composition from iron and titanium impurities Leather Chestnut Retired Emperor Hadari Tachitachi The present invention relates to non-ferrous metallurgy and mechanical engineering, and more specifically to eutectic aluminum. This invention relates to a method for refining Umu silicon alloy from iron and titanium impurities. present in high concentrations These impurities may have an adverse effect on the working properties of the alloy. Stronganoff, B.N. Rothenberg, G.B. Gerschmann (G. .

B, Stroganov+ V, A, Rotenberg, G, B, G aluminum-silicon alloy (aluminum-silicon alloy) licon alloys),” 1977, pp127.128.132-13 4.1 Metallurgiya + (Metalurgiya) Co., Ltd., see Mosny) 0 alloy The refined eutectic aluminum-silicon alloy is used in automobiles, tractors and In the industry, we manufacture parts with various complex shapes, such as 1. C. Engine pin For casting stones, cylinder heads, H, P, pump casings, etc. used.

l rice ■ technique distortion As known in the prior art, eutectic aluminum-silicon alloys are mixed with iron and titanium impurities. The method involves smelting a eutectic aluminum-silicon alloy together with chromium and manganese. , the total weight of chromium and manganese is determined by the weight ratio of chromium to manganese (0.5 to 1.0 ): 1, 1.2 to 2.0) = 1 for the total weight of iron and titanium impurities. solid aluminum into the resulting melt. The method includes a step of cooling the melt to 615 to 620°C.

The process of cooling the melt to the above temperature is a process for cooling the melt to the above temperature. intermetallic compounds of silicon and titanium, chromium, manganese, aluminum and This cooling is characterized by the formation of intermetallic compounds of silicon and silicon. The melt is filtered within the above temperature range to remove the iron and iron contained in the above intermetallic compounds. and remove titanium. [Soviet Patent No. 1.108,122, TP CcoC2 2C1106, inventor's certificate, publication "Discoveries + Inventions" 30.1984].

This known method for refining aluminum-silicon alloys with eutectic composition has the following drawbacks: have.

1. Aluminum-silicon melt is mixed with iron and titanium contained in intermetallic compounds. The yield of the aluminum-silicon melt in the step of filtering it from , the iron and titanium contents in the aluminum-silicon melt before filtration are 2 and 1, respectively. In terms of weight percent, the yield of aluminum-silicon melt is 88.1%; 11.9% of the total amount is a combination of intermetallic compounds and a certain amount of crystallized aluminum-silicon alloy. In the form of a mechanical mixture, it is lost as a residue on the filter. In this case filter The aluminum content in the residue is high, amounting to 80.3% by weight. This short casting method (s (hortcasting) is the main cost of refined aluminum-silicon alloys with eutectic composition. as well as increasing aluminum consumption for its production.

2. Expensive metals (chromium and manganese) involved in the formation of the above intermetallic compounds 1 of the sum of iron and titanium that is consumed in large quantities, i.e., removed. #per L weight, It is necessary to introduce 1.2 to 2.0 weight units for the sum of chromium and manganese, and this Also increases the main cost of refined aluminum-silicon alloys.

3. In particular, refining aluminum-silicon alloys containing high iron and titanium content. In some cases, the degree of refinement of eutectic aluminum-silicon melts from iron and titanium is low. For example, the content of iron and titanium in the aluminum-silicon melt before filtration is 0.8 and 0.4% by weight, the ratio of chlorine to the total weight of iron and titanium is The total weight ratio of chromium to manganese is 1.2:1, and the weight of chromium to manganese is 1.2:1. The ratio is 0.5 to 1, and the refining degree of the eutectic aluminum-silicon melt to iron is 2. 7.5% and 67-5% for titanium.

The low degree of refinement of eutectic aluminum-silicon alloys means that refined aluminum has lower performance characteristics. This results in the production of a Ni-silicon alloy.

A specific object of the present invention is to prepare a eutectic aluminum-silicon alloy free of iron and titanium impurities. This is to solve the problems seen in the method of refining chromium, manganese, This is achieved by appropriately selecting the weight ratio between iron and titanium, which The yield of aluminum-silicon melt in the process is increased, and it is possible to reduce the cost of ROM and manga. The aluminum-silicon alloy is free from iron and titanium impurities. The refining degree is higher and at the same time the quality of the refining alloy is improved by melting together with the gun and obtained. The melt is cooled to 590 to 660°C, and the cooled melt is passed through a wire within the temperature range. refining the eutectic aluminum-silicon alloy from iron and titanium impurities. The amount of chromium and manganese used and the weight ratio of chromium to manganese are (0.1-2.0): When 1, the total weight of these is iron and titanium impurities. The precision is characterized in that the ratio is 0.2 to 1.1):1 relative to the total weight. Achieved by providing alchemy.

When the weight ratio of chromium to manganese (0,1 to 20) = 1, chromium and manganese The total weight of iron and titanium impurities is 0.2-1.1): 1. The fact that chromium and manganese are used in the amount of aluminum in the filtration stage - Contributes to increasing the silicon melt yield to 98.8%, and also contributes to increasing the yield of silicon melt to 98.8%. - Destroyed the aluminum content in the residue by 15.4% and completely consumed chromium and manganese. amount to approximately 115.75, and the refining level of the eutectic aluminum-manganese melt to iron. 80.5% compared to titanium, 94% compared to titanium, and at the same time improved the quality of the refined alloy. For example, reducing the iron content in aluminum-silicon alloys from 0.70% by weight 0.38% by weight, and titanium content from 0.25% to 0.06% by weight. , the elongation rate of the refined alloy increases from 2.5% to 3.7%, or 1.5 times Become.

The above advantages of the above method are due to the following reasons.

Chromium and manganese in a chromium to manganese weight ratio (0.1-20): 1 Therefore, the ratio of the total weight of these to the total weight of iron and titanium impurities is (0,2-1, 1): When used as 1, the cooled aluminum-silicon melt is as follows. Contains the following intermetallic compounds (shown in Table 1):

Formation of the above intermetallic compound having the above composition is most preferable in achieving the above objective. stomach.

The intermetallic compounds mentioned above crystallize during cooling as large polyhedral, spherical and dendrite crystals. process to remove iron and titanium from the eutectic aluminum-silicon melt. At this point, the cooled cough melt is separated into containers.

Implementation of known method for refining eutectic aluminum-silicon alloy from iron and titanium impurities Then, the intermetallic compounds formed in the cooled aluminum-silicon melt are as follows. These are shown in Table 2 below.

In the filtration stage of aluminum-silicon melt, the intermetallic compounds shown in Table 2 However, the removal of iron and titanium impurities as intermetallic compounds listed in Table 1 is guarantee the achievement (resolution) of the stated purpose (problem). This is because during the implementation of the above refining method, The intermetallic compounds formed in the aluminum-silicon melt can be removed by performing known refining methods. In comparison to the intermetallic compounds formed in the aluminum-silicon melt, of iron and titanium, with low concentrations of chromium, manganese and aluminum. This is because it contains Moreover, the method of refining the aluminum-silicon alloy of the present invention is practical. During the cooling process, CrAlq, Cr6. a5Mno, zA Rs, Cro , aMno, IA j! z, 1Sio, 4, MnA 1b, Cr o, hA 12S io, i・Mna, sA 1 z, zs io, a. These compounds are formed by known methods and their filtration does not involve the formation of intermetallic compounds. Separation of chromium, manganese, and aluminum from the aluminum-silicon melt in step Low yield of aluminum-silicon melt resulting in high consumption rate of aluminum and silicon and increase the aluminum content in the filter residue.

The formation of intermetallic compounds listed in Table 1 and containing high concentrations of iron and titanium is Contributes to reducing the total weight of intergeneric compounds. This in turn is the intermetallic formation on the filter. Aluminum-silicon crystallization in the filter residue reduces the height of the composite layer and as a result Eliminate loss of base alloy, reduce aluminum content in filter residue, and improve refining Increase alloy yield.

The ratio of the total weight of chromium and manganese to the total weight of iron and titanium is (0,2-1,1) : 1 and the weight ratio of chromium to manganese was limited to (0,1-20):1. is due to the following reasons.

That is, the weight ratio (Cr 0 Mn): (Fe + Ti) is eutectic aluminum The amounts of chromium and manganese are most palatable when reduced to less than 0.2:1 in the silicon melt. This is insufficient for the formation of the above-mentioned intermetallic compound having a composition (Table 1). this place Ai, Feo, sAj! Intermetallic metals formed in the melt of type t, 5sio, s The compound has a low iron content but a high aluminum content, which indicates that it is a eutectic Reduce the degree of refining of aluminum-silicon melt from iron and titanium impurities, and It also reduces the quality of the refined alloy. This is because the intermetallic compound as small crystals This is because some of the material remains in the refined alloy.

In addition, when the above ratio decreases beyond the lower limit, aluminum in the filter residue The content increases. This is because the residue accumulates in intermetallic compounds *F Intermetallic compounds of the eo, sAlz, 5sio, and s types have high aluminum content. Notice that it has a rate.

Weight ratio (Cr + Mn): (Fe + Ti) is aluminum-silicon melt When the value increases above 1.141, the chromium and titanium impurities increase. During cooling, excess amounts of manganese and manganese form the following intermetallic compounds: Cro, nMno, tA A! , I S ia, a i Cro, as Mno, zA 12 s, t; Cro, hA nzsio, *; CrA j! 7; MnA j! a and other intermetallic compounds listed in Table 2. Additionally, these intermetallic compounds have high concentrations of chromium, manganese, and aluminum. shows low iron and titanium concentrations, while the formed intermetallic compounds, e.g. ro, osMno, tA 1s, ti CrA A,; MnA Ah; C re, iA j! zsie, ti Mno, sA l g, zsjo, a Which part contains no iron or titanium, aluminum-silicon melt iron The removal of these intermetallic compounds in the filtration step from titanium and titanium This leads to a decrease in the yield of aluminum-silicon alloys and the aluminum content in the filter residue. In addition, if the above weight ratio is higher than the upper limit, the ROM or ROM will be expensive. In addition to incurring excessive labor costs for aluminum-silicon alloys and manganese, There is also no improvement in the degree of refinement from titanium impurities.

When the weight ratio between chromium and manganese falls below 0.1:1, the Formation of intermetallic compounds with the most favorable compositions in aluminum-silicon melts Moreover, high manganese content in aluminum-silicon alloys In view of the low chromium content under The basic role of carbon dioxide is attributed to manganese. In this case, intermetallic Things: Feo, zMno, zA 1t, m5io, si Mno, sA j ! z, 5Sio, ai Feo, zMno, sA 1t, s; MnA j! b is formed and the removal of these compounds in the filtration step - Decreased silicon alloy yield, increased aluminum content in filter residue, and Not only does this lead to a decrease in the refining level of aluminum-silicon alloys from iron and titanium, but also It also impairs the quality of refined alloys. This is the intermetallic compound formed: Feo, tM no, xA 1 t, 4sio, s; Mno, sA 12 g, *sie, n iF eo, zMno, sA 1z, s; MnA j! b is Rich in manganese and aluminum, and intermetallic compound Mn+, s・A 12 z, 3S io-a and MnAlh do not contain any iron or titanium. This is due to the fact that

If the weight ratio of chromium to manganese exceeds 20:1, chromium to manganese is found in aluminum-silicon melts. In this case, the Luminium-silicon melts are primarily chromium- and aluminum-rich intermetallic compounds, such as CrAlt; Cro, 5Tio, 5Sio, 4AJ+, s ;　Fe6.1Cr6.6Si1.7Tio,s　;　Cro,zFee,n A　It　t, ss　io, 4　i　Cro, 3Feo, zA　l　+, tSi o, w, thereby increasing the step of aluminum-silicon melt in the filtration stage. The retention is lower and the aluminum content in the filter residue is higher, iron and The degree of refinement of aluminum-silicon alloys from titanium impurities is also not improved.

(0,2-1,2): the coefficient for the total weight of iron and titanium impurities equal to 1 The claimed ratio of the total weight of ROM and manganese and equal to (0,1-20):1 The weight ratio of chromium to manganese is related to each other and works in combination to achieve the above advantages. It should be noted that the achievement is guaranteed.

The aluminum-silicon melt is cooled to less than 590°C, and the cooled melt is When filtered at temperatures below 590°C, the eutectic aluminum-silicon melt begins to crystallize. Melt. The melt loses its fluidity and cannot be filtered, or the filtration This will result in a large amount of loss as residue.

The aluminum-silicon melt is cooled at a temperature higher than 660°C, and Refining of aluminum-silicon melt from iron and titanium impurities when filtered with The degree becomes lower. At temperatures above 660°C, the intermetallic compounds listed in Table 1 No material is formed (in this case, iron and titanium are aluminum-silicon alloys) or the formation process of the intermetallic compound has not yet been completed. (In this case, the intermetallic compound contains relatively small amounts of iron and titanium, with small crystals and The crystals are embedded in the aluminum-silicon melt during the filtration step, and the crystals are (contaminating the alloy with iron and titanium), such aluminum-silicon alloys may be further During crystallization (i.e., when casting various articles from this alloy), intermetallic compounds crystals grow, which results in the alloy's working properties (i.e., the products made from it). (performance characteristics of the product) deteriorate. Iron and titanium in this aluminum-silicon alloy The ratio of the total weight of chromium and manganese to the total weight of impurities and the ratio of chromium to manganese to the total weight of impurities. of the total weight of intermetallic compounds as specified in Table 1, depending on the weight ratio of The content of each compound varies within the following weight percentages.

Cra, osFeo, sAf+, sS! 0.5 15, Cr++, osFeo -sAj! +, +S i,, -0,5-30,Feo,5Cro,osMn o, o2A1+, sSI 3-15, Feo, 5Cro,. +Mno, azA 1 +, +S L, <3 15, Feo, 5Cro, 4Si+, +Tio, s O, 515, Cro, aT iS L, s O, 5-15, Feo, nCr o, 2Mno, +Sl+, zT! o, s 3 2 0, Fe0.4Cro, o eMno,otA　I2. , sS iTi, , -3-20, F eo, 4 Cre, +A#Si,,,Tio,5-3-20,C".,sT!o,ts! o, 5Aj2+, +0.5-25° Thus, for a constant total weight of iron and titanium impurities equal to, for example, O,a:t. in the ratio of the total weight of chromium and manganese, and O14:1 to l0=1. Under the weight ratio of chromium to manganese varying in the range, the intermetallic compounds Cro, osF eo, sA1+, +Sl+, n and F eo, 5Cro, 4S! +, +TIo , s by weight of total intermetallic compounds ranges from 3 and 2% to 20 and 9%, respectively. increase to %.

Based on the above considerations, it is recommended to adopt the following two ways of implementing the method of the present invention. do.

In a first embodiment of the method of the invention, chromium and manganese are The ratio of the amount to the total weight of iron and titanium impurities is (0,2-0,69):1. When used in quantities, the weight ratio of chromium to manganese is equal to (0,5-20):1. We recommend that you maintain it as such. In this case, mainly aluminum-silicon metal The intermetallic compounds formed in the melt are those with the most advantageous compositions:

Cro, osFeo, sA j2 +, + S I +, 4; Feo, t cro, as i+, +Tio, s; Cra, sT! S! +, s ;Fee, 4Cro, +A 12S i+, +T in, a this They contain a minimum concentration of aluminum and a maximum concentration of iron and titanium. above metal Iron and titanium in the composition of intercalary compounds during the filtration stage of the aluminum-silicon melt. Removal of tan ensures high efficiency of the refining process of the invention.

In a second embodiment of the method of the invention, the total weight of chromium and manganese versus iron is and titanium impurities in an amount such that the ratio of the total weight is (0,7-1,1)=1. When using chromium and manganese, the weight ratio of chromium to manganese is (0,1 -0,4): It is recommended that it be kept equal to 1. Therefore, Al In this case, the intermetallic compounds mainly formed in the mini-silicon melt are The most advantageous compositions are iF eo, sCro, o+Mno, 02Al 1. l511.4;F eo, 4Cro, zMno, +S i+, 2T In, a These intermetallic compounds have a high content of iron and titanium and characterized by low contents of chromium, manganese and aluminum.

Removal of iron and titanium from the intermetallic compounds ensures high efficiency of the above smelting process. .

An advantage of the present invention compared to known methods is that any chromium, manganese, Although the weight ratio of iron and titanium is achieved, the best results are achieved using the method of the present invention. , obtained when carried out in the manner listed above as an embodiment thereof.

Eutectic aluminum to be refined from iron and titanium impurities by the method claimed. Mu-silicon alloys can be obtained by various known methods. For example, the aluminum -Silicon alloys are manufactured by combining silicon and aluminum in alloy production mixers, induction or gas-fired furnaces. and/or their primary or secondary alloys (aluminosilicate, ferroaluminum It can be obtained by melting together the following materials: 1-All genera or combinations Gold is produced when the aluminum-silicon alloy has a eutectic composition and has a composition of 10 to 14 % silicon by weight.

Ore - iron and titanium if reduced electric furnace and alumosilicate raw materials are available The aluminum-silicon eutectic alloy to be refined from impurities can be obtained as follows. Can be done. Alumosilicate raw materials and carbon-based restorer ) is melted by ore-reduction melting in an ore-reduction furnace. , the following hypereutectic composition: silicon; iron, 2-5; titanium, 0.8-3; balance aluminum % (wt.%). This ultra-common aluminum The Ni-Silicon alloy is then treated with a fluxing agent in a ladle to remove non-metallic inclusions. , is injected into the alloy production mixer. of silicon in the ultra-common aluminum-silicon alloy. Depending on the proportion, the alloy can be mixed with aluminum and/or primary or secondary aluminium. diluted with a umium-based alloy to obtain a eutectic composition (silicon content of the alloy = 10-14% by weight). do.

Thus, the refining method of the present invention can remove iron and titanium impurities by any known method. The premise is to manufacture a raw material eutectic aluminum-silicon alloy.

Furthermore, the role of the aluminum-silicon alloy to be refined is that it is contaminated with iron and titanium impurities. Played by a dyed secondary aluminum-silicon alloy. Super-commonality or low-commonality When using this secondary aluminum-silicon alloy with a crystalline composition, the alloy is It must have a eutectic composition.

The best B+ffi that implements the present invention Inventive method for refining eutectic aluminum-silicon alloys from iron and titanium impurities It is recommended that this be done as follows.

Alloy composition A 1-Cr and Aj2-Mn have a predetermined component ratio, Prepared in an induction furnace at 750-1100°C. The resulting alloyed composition is alloyed In a mixer, raw aluminum-silicon eutectic alloy containing iron and titanium impurities and They are melted together to obtain a eutectic aluminum-silicon alloy. The aluminum-based alloy composition is added to the raw material eutectic aluminum-silicon alloy. (with a silicon content of 10% by weight), the composition for the alloy and/or convert the raw material aluminum-silicon alloy into a eutectic aluminum-silicon melt. should be mixed with sufficient silicon to produce .

The amount of alloying composition introduced into the aluminum-silicon melt is The total weight of iron and titanium impurities versus the total weight of chromium and titanium impurities. Determined based on a predetermined weight ratio of the gun.

In order to make the composition of the obtained aluminum-silicon melt uniform, it is necessary to It is recommended that the mixture be mixed for 5 to 30 minutes. Upon completion of mixing, the aluminum Allow the silicon melt to stand for 10-15 minutes to remove non-metallic inclusions from it. and recommended.

During this maintenance step, the aluminum-silicon melt is cooled. However, given temperature (590-660°C), the melt is e.g. The weight ratio of aluminum to aluminum-silicon melt is (0,Q　1-0.1 ): solid aluminum or aluminum-based solid alloy to be equal to l Force cooling by adding

Solid aluminum or aluminum to cooled eutectic aluminum-silicon melt If a low compatibility melt is produced by the addition of umium-based alloys, some silicon is required to be added to the cooled aluminum-silicon melt, and The amount of silicon used is that required to obtain a just cooled eutectic melt.

To speed up the cooling process, keep stirring the aluminum-silicon melt and It is practical to measure the temperature continuously with a tungsten-rhenium thermocouple. It is advantageous.

This cooled eutectic aluminum-silicon melt is melted at temperatures ranging from 590 to 660°C. filtered at temperature.

During filtration, the molten eutectic aluminum-silicon melt is filtered through a filter; is received in a metal receiver placed below the filter and contains iron and titanium; The high melting point intermetallic compound having the composition specified in Table 1 is filtered to remove the aluminum-silicon material. The aluminum-silicon alloy is separated from the raw melt and transferred to the filter residue. Smelted from iron and titanium.

The desired product is then processed into the refined aluminum-silicon alloy by various known methods. It is cast from.

The technical and economic characteristics of the claimed and known refining processes, e.g. Yield of aluminum-silicon melt, aluminum content in filter residue, chromium and manganese consumption, aluminum-silicon alloys from iron and titanium impurities The degree of refinement is measured as follows.

ii The yield of aluminum-silicon melt in the filtration step is Weight of Mu-silicon melt and residue of aluminum-silicon melt in melt mixer after filtration It is given in % as the ratio of the weight of aluminum-silicon melt after filtration to the difference from the residue. available.

The aluminum content in the filter residue is determined by the chemical or Measured by optical analysis.

The consumption of chromium and manganese is determined by calculating the total weight of chromium and manganese used as raw materials. Measured as the quotient divided by the total weight of iron and titanium contained in the aluminum-silicon alloy. determined.

The degree of refinement of aluminum-silicon alloys from iron and titanium impurities is determined by The difference between the content of iron and titanium impurities in the aluminum-silicon melt can be The quotient (expressed in %) divided by the content of the impurity in the aluminum-silicon melt before ) is measured as

In order to better understand the invention, some examples of its embodiments are given below.

Technical-economic indications obtained when the claimed method is carried out according to Examples 1 to 9 (Yield of aluminum-silicon compounds in the stage of filtration from iron and titanium) Aluminum content in filter residue, aluminum-silicon alloy to be refined Total consumption weight of chromium and manganese per unit weight of iron and titanium impurities of amount, degree of refinement of aluminum-silicon alloy from iron and titanium impurities) are as shown in the example. They are summarized in Table 3 below. In the same table, the smelting, characterizing the ductility of the alloy Information on the elongation of aluminum-silicon alloys was also given. Furthermore, for comparison, A similar technique of the known method obtained by carrying out according to Examples 10 and 11 Technical-economic indicators and elongation of the produced refined aluminum-silicon alloys It also gives data.

Dajo coal soil The eutectic aluminum-silicon alloy to be refined has the following composition (wt%): silicon, 13.9; Iron, 0.8; Titanium, 0.4; Aluminum, balance.

An aluminum-silicon alloy having the above composition at a temperature of 750°C is placed in an alloy production mixer and subjected to induction. Alloying composition Al produced in a induction furnace and heated to 800°C and 820°C, respectively -Mn and AI! -It melts together with Cr. The amount of the composition for the alloy is chromium At a weight ratio of 0°1:1 to manganese, the total weight of chromium and manganese to iron and A total weight ratio of 0.1:1 of titanium and titanium impurities must be ensured.

By melting eutectic aluminum-silicon alloy with chromium and manganese, The resulting aluminum-silicon melt has the following eutectic composition (wt%): : Silicon, 12.5. Iron, 0.8; Titanium, 0.4; Chromium, 0.02. manganese , 0.22. Aluminum, remainder.

The temperature of the eutectic aluminum-silicon melt produced is 760°C. This aluminum In order to cool the Umu silicon melt to 590°C, add aluminum little by little to it. Solid aluminum is added at a weight to melt ratio of 0.08:1. cooling The temperature of the aluminum-silicon melt is continuously measured. This aluminum - When the temperature of the silicon melt reaches 590°C, this cooling process is stopped and the melt is is filtered at the same temperature.

Refined eutectic aluminum-silicon melt passing through the filter is placed below the filter. Collect in a placed metal container. This melt contains silicon, 11.3; iron, 0.46; titanium 0.12. Chromium, 0.01; Manganese, 0.08; Aluminum, 100 The balance (% by weight) is in the composition. The intermetallic compounds collected on the filter are Contains iron and titanium.

Sharp ship■mata The eutectic aluminum-silicon alloy to be refined contains, in weight percent, silicon, 13.2; , 1.4; titanium, 0.7; aluminum, balance.

Put the aluminum-silicon alloy having the above composition at a temperature of 670°C into an alloy production mixer, Composition A for producing alloys made in an induction furnace and heated to 900°C and 780°C, respectively Melts with ll-Cr and A12-Mn. Amount of composition for making this alloy is the total weight of iron and titanium impurities at a chromium to manganese weight ratio of 10:1. The specification of total weight of chromium and manganese to quantity shall be 0.65:1. No.

Stir the aluminum-silicon alloy for 15 minutes to homogenize its composition. . As a result, silicon, 12.0; iron, 1.4; titanium, 0.7; chromium, 1. 24; manganese, O, l　2　; aluminum, balance (weight%) of eutectic composition An aluminum-silicon melt is formed.

The temperature of the aluminum-silicon melt obtained is 690°C.

The melt is maintained for 30 minutes to remove non-metallic compounds and cooled to 660°C. Next The cooled melt is then filtered at the same temperature.

The refined aluminum-silicon melt collected in the metal receiver contains silicon, 11.5; iron, 0.34; Titanium, 0.07; Chromium, 0.45; Manganese, 0.04; Aluminum Ni, the balance (wt%) up to 100%.

Example 3 The eutectic aluminum-silicon alloy to be refined contains, in weight percent, silicon, 13.6; , 2.0: titanium, 1.0: aluminum, and the remainder.

The aluminum-silicon alloy to be refined with the above composition at 730°C is placed in an alloy production mixer. For alloy production, they were heated to 930°C and 780°C, respectively, and made in an induction furnace. Composition A (melted together with 1-Cr and AI!-Mn. This alloy production composition The amount of iron and titanium impurities at a chromium to manganese weight ratio of 20:l The ratio of the total weight of chromium and manganese to the total weight of 1.1 = 1 must be satisfied. Must be.

To make the composition of the aluminum-silicon melt uniform, the melt was stirred for 25 minutes. Ru. As a result, the resulting aluminum-silicon melt has a silicon Element, 12.1; Iron, 2.0; Titanium, 1.0; Chromium, 3.15; Manganese, 0 ．． 15; The temperature of the resulting melt, which has a eutectic composition consisting of aluminum and the remainder, is 78 It is 0°C.

This aperture is used to remove non-metallic inclusions from the melt and partially cool it. The temperature of the aluminum-silicon melt is maintained at 730° C. for 40 minutes. this To cool the aluminum-silicon melt to 625°C, solid aluminum is added to it. Add aluminum at a weight ratio of 0.05:1 aluminum to cooled melt.

The cooled melt is then filtered at 625°C.

Refined aluminum-silicon melt placed in a metal receiver is expressed in weight percent. Element, 11.6; Iron, 0.42; Titanium, 0.10; Chromium, 0.7; Manganese, 0.04: Has a eutectic composition consisting of aluminum and the balance.

large coal soil The eutectic aluminum-silicon alloy to be refined has, in weight percent, silicon, 13.9; It has a composition of iron, 0.8; titanium, 0.4; aluminum, balance.

An aluminum-silicon alloy with the above composition at a temperature of 700°C was put into an alloy production mixer. , alloy manufacturing composition Al-Cr made in an induction furnace at 850°C and 780°C, respectively. and Af-Mn. The amount of composition for making this alloy is chromium vs. Chromium to total weight of iron and titanium impurities at gun weight ratio 20:l and manganese should satisfy a total weight ratio of 0.271. aluminum produced -Silicon melt, expressed in weight%, silicon, 12.8; iron, 0.8; titanium, 0 ．． 4; Chromium, 0.23; Manganese, 0.01; Aluminum, remainder eutectic composition The temperature of the melt is 730°C. This aluminum-silicon melt For cooling to 590°C, the weight ratio of aluminum to cooling melt is 0.07:1. Solid aluminum is added to the melt so that 0 is then added to the acid melt at 59 Filter at 0°C.

The refined aluminum-silicon melt collected in the metal receiver has a silicon Element, 11.0; Iron, 0.30; Titanium, O, OS, Chromium, 0.10; Manganese , 0.005; has a eutectic composition of aluminum and the remainder.

Kyoto Kintama The eutectic aluminum-silicon alloy to be refined is silicon, 13.2; iron, 1.4; titanium. The composition is 0.7; the balance (weight %) is aluminum.

An aluminum-silicon alloy to be refined having the above composition at a temperature of 690°C is made into an alloy. Alloys with temperatures of 860°C and 760°C, respectively, were charged into a mixing mixer and made in an induction furnace. Production composition fi, 1-Cr and AI! .

-It melts together with Mn. The amount of composition for making this alloy is chromium to manganese weight At a ratio of 10:1, chromium and manganese to the total weight of iron and titanium impurities The ratio o, , as:t of the total weight of the gun should be satisfied.

In order to make the composition of this aluminum-silicon melt uniform, the melt was heated for 20 minutes. Mix. The resulting aluminum-silicon melt contains silicon, expressed in weight percent, 12. 9i iron, 1.4; titanium, 0.7; chromium, 0.86; manganese, 0.085; Aluminum, the remainder is in a eutectic composition. Temperature of produced aluminum-silicon melt is 700°C. The method was heated to remove non-metallic inclusions and cooled to 590°C. Hold the temperature for 45 minutes at 0 and then filter at 590°C.

The refined aluminum-silicon melt collected in a metal receiver is expressed as a silicon Element, 11.2i Iron, 0.32; Titanium, 0.05. Chromium, 0.30; manganese , 0.03; there is a eutectic composition consisting of aluminum and the remainder.

Sm-dan The eutectic aluminum-silicon alloy to be refined has, in weight percent, silicon, 13.6; It has a composition of iron, 2.0; titanium, ], 0; aluminum, balance.

The aluminum-silicon alloy with the above composition to be refined is heated to 750°C in an alloy production mixer. The alloy production compositions were prepared in an induction furnace at 840°C and 880°C, respectively. Thing Aj! Melts with -Cr and A1-Mn. The alloy manufacturing composition is The total weight of chromium and manganese to iron at a chromium to manganese weight ratio o, s:i. and titanium impurities in an amount such that the total weight ratio is 0.69:1.

In order to homogenize the composition of the aluminum-silicon melt, the melt was mixed for 15 minutes. expressed in weight%, silicon, 12.2; iron, 2.0; titanium, I, 0; chromium; 0.69i manganese, 1.38; aluminum, remainder aluminum with eutectic composition Obtain Mu silicon melt. The temperature of the resulting melt is 780°C.

Remove non-metallic inclusions from the aluminum-silicon melt and partially cool it. Therefore, the melt is maintained for 30 minutes. Then the weight ratio of aluminum to cooled melt Solid aluminum is added to the melt so that the ratio is 0.06:1. is cooled to 625°C. Filter the aluminum melt at this temperature.

The refined aluminum-silicon melt collected in a metal receiver is expressed as a silicon Element, 11.3; Iron, 0.37i Titanium, 0.06. Chromium, 0.24; manganese , O,,55, aluminum, and the balance has a eutectic composition.

1 trip■1 The eutectic aluminum-silicon alloy to be refined is silicon, 1.9; iron, 0.8; titanium. , 0.4; aluminum, balance (weight %).

The aluminum-silicon alloy to be refined with the above composition was heated to 680°C in an alloy manufacturing mill. The compositions for alloy production were put into a gas tank and made in an induction furnace at 850°C and 840°C, respectively. Material A 1- Melts together with Cr and An-Mn. The amount of the composition for producing the alloy is , the total weight of chromium and manganese at a chromium to manganese weight ratio of 0.4:1. The amount is such that the ratio of the total weight of iron to titanium impurities is 0.7:1.

The resulting aluminum-silicon melt contains silicon, 12.8i iron, 0.8; titanium, 0.4; Chromium, 0.24 certain manganese, 0.60; Aluminum, balance (weight%) ), and the temperature of this melt is 730°C.

In order to cool this aluminum-silicon melt to 590°C, aluminum vs. Solid aluminum is added to the melt so that the weight ratio of the melt is o, o’y:1. Add to. The melt is then filtered at 590°C.

The refined aluminum-silicon melt collected in a metal receiver contains silicon, 11.2; iron, 0.36; Titanium, 0.08; Chromium, 0.10; Manganese, 0.25. Aluminum It has a eutectic composition of Ni, the balance (wt%).

Great disaster 1 The eutectic aluminum-silicon alloy to be refined is silicon, 13.2; iron, 164; titanium. aluminum, the balance up to 100 (wt%).

Alloy production of aluminum-silicon alloy to be refined with the above composition at a temperature of 680°C The alloys are produced in an induction furnace at 860°C and 880°C, respectively. composition A1-Cr and Affi-Mn. The composition contains chromium At a weight ratio of o to manganese and 2s:t, the total weight to iron and titanium The amounts used are such that the ratio of the total weight of pure products is 0.9:1.

The aluminum-silicon melt was mixed for 20 minutes to ensure a uniform composition. Silicon, 12.0i Iron, 1.4; Titanium, 0.7: Chromium, 0.38; Man Gun, 1.51i aluminum, remainder (wt%) aluminum with eutectic composition. Generates silicon melt. The temperature of the melt is 710°C. Melt for 45 minutes to remove all non-metallic inclusions and cool it to 660°C. The melt is filtered at 660°C.

The refined aluminum-silicon melt collected in a metal receiver contains silicon, 11.5; , 0.37; Titanium, 0.09i Chromium, 0.14; Manganese, 0.35; Al It has a eutectic composition of 50% aluminum and the remainder (weight%).

Susaipi' black The eutectic aluminum-silicon alloy to be refined consists of silicon, 13.6; iron, 2, O; titanium. The composition is 1.0; the balance (weight %) is aluminum.

The aluminum-silicon alloy to be refined having the above composition was heated to 730°C in an alloying mill. Alloy production composition at 850℃ and 920℃, respectively, put into a gas tank and made in an induction furnace It melts together with the substances Af-Cr and AA-Mn. The amount of the composition used is chromium At a weight ratio of o to manganese, 1:i, these total weights to iron and titanium impurities The amount is such that the ratio of the total weight of the objects is 1.1:1.

Stir the aluminum-silicon melt for 25 minutes to homogenize its composition. Silicon, 12.2; iron, 2.0; titanium, 1.0 nichrome, 0.3; manga aluminum, balance up to 100 (wt%) aluminum of eutectic composition Produces Ni-Silicon melt. The temperature of the resulting melt is 790°C.

An acid melt is used to remove non-metallic inclusions from the melt and to partially cool it. Leave for 45 minutes. This lowers the temperature of the melt to 730°C. this In order to cool down to 625°C, the weight ratio of aluminum to cooling melt is 0.05. Add solid aluminum to the melt at a ratio of 1:1. Then this cooled Filter the melt at 625°C.

The refined aluminum-silicon melt collected in the metal receiver contains silicon, 11.6; Iron, 0.39; Titanium, 0.08; Chromium, 0.10; Manganese, 0.65i Eutectic composition of aluminum, balance (wt%) Soviet inventor's certificate patent No. 1,108, According to No. 122, the aluminum-silicon alloy to be refined contains silicon, 13.9; , 0.8: titanium, 0.4: aluminum, balance (wt%) .

The aluminum-silicon alloy to be refined having the above composition was heated to 750°C in an alloying mill. The alloy manufacturing assembly at 870°C and 860°C, respectively, was put into a Synthesis Aj! Melts with -Cr and A1-Mn. The amount of this composition is chromium At the weight ratio of manganese to O, S:X, the total weight of iron and titanium impurities The amount is such that the ratio of the total weight of the objects is 1.2:1. Aluminum-silicon obtained The raw melt is silicon, 12.8; iron, 0.8; titanium, 0.4; lithium, 0.4; Manganese, 0.96. Aluminum, balance (wt%) up to 1oo eutectic composition has. The temperature of the melt is 780°C. Cool this melt to 615℃ In order to Add aluminum to the melt. When the temperature reaches 615℃, stop cooling and Filter the melt at temperature.

The refined aluminum-silicon melt collected in a metal receiver contains silicon, 12.6; , 0.58. Titanium, 0.13. Chromium, 0.10. Manganese, 0.16; Al Soviet Inventor's Certificate Patent No. 1,108,12 According to No. 2, the eutectic aluminum-silicon alloy to be refined is silicon, 13.6. iron, 2. It has the following composition: o: titanium, 1, O: aluminum, balance (weight %).

An alloying mixer of the aluminum-silicon alloy to be refined having the above composition at 730°C. compositions for alloy production at 930'C and 900°C, respectively. It melts together with Al-Cr and A6-Mn. The composition has a ratio of chromium to manganese. Weight ratio 1. :1, the ratio of their total weight to the total weight of iron and titanium impurities Use in an amount such that the ratio is 2.0:1.

To make the composition of the aluminum-silicon melt uniform, the melt was mixed for 30 minutes. match. The resulting aluminum-silicon melt contains silicon, 12.2. Iron, 2.0; Tan, 1. O; Chromium, 0.3; 77 gun, 3.0; Aluminum, balance (weight %). The temperature of the melt produced is 800°C.

The melt is heated to remove non-metallic inclusions from the melt and to partially cool it. Let stand for 45 minutes until its temperature reaches 740°C. The aluminum with eutectic composition In order to cool the Umu silicon melt to 620°C, the weight of aluminum versus the cooling melt is Solid aluminum is added to the melt in a quantity ratio of 0.06:1. and filter the cooled melt at 620°C.

The refined aluminum-silicon alloy collected in the metal receiver contains silicon, 12.3; ,O,? Oi Titanium, 0.25i Chromium, 0.35; Manganese, 0.40; Al It has a eutectic composition of 50% aluminum and the rest (weight%).

The technical and economic characteristics of the invention and of the known method given in Table 3 are claimed. The advantages of this method have been demonstrated.

Thus, the method of the present invention can be applied to silicon, 13.9; iron, 0.8; titanium, 0.4; Refining a eutectic aluminum-silicon alloy with a composition of aluminum, balance (wt%) When used for be commandeered.

1. Yield of aluminum-silicon melt at the stage of filtration from iron and titanium increase from 93.5% to 97.5-98.8%, or 4-5.3 absolute %.

2. The aluminum content in the filter residue ranges from 72.3% to 55.2-64. 3%, or 8-17.1% absolute.

3. The total consumption of chromium and manganese is reduced by 1/1.7-1/6.

4. The degree of refining of the eutectic aluminum-silicon alloy from iron is from 27.5% to 42.5%. 62.5% (ie 1.5-2.3 times).

5. The degree of refining of the eutectic aluminum-silicon alloy from titanium is from 67.4% to 70- 87.5% (ie 2.5-20 absolute %).

6. The elongation of III wrought aluminum-silicon alloy is from 3.0% to 3.3-4.0% (ie 1.1-1.3 times).

For example, silicon, 13.6. Iron, 2.0; Titanium, 1. o; Aluminum, remainder ( This product is used to refine aluminum-silicon alloys with a eutectic composition (wt%). The disclosed method offers the following advantages compared to known methods.

1゜ Yield of aluminum-silicon melt at the stage of filtration from iron and titanium increase from 88.1% to 97.0-98.0%, i.e. 8.9-9.9 absolute%. Ru.

2. Aluminum content in filter residue ranges from 80.3% to 59.2-66.5 %, or 13.8-21.1 absolute %.

3. The total consumption of chromium and manganese is reduced by 1/1.8-1/2.9.

4. The refining degree of eutectic aluminum-silicon alloy for iron is 65.0% to 79.0%. -81.5% (i.e., 2-1.25 times).

5. The degree of refining of titanium in the eutectic aluminum-silicon alloy is from 75.0% to 90%. -94% (ie 1.2-1.25 times) increase.

6. The elongation rate of refining aluminum-silicon alloys ranges from 2.5% to 3.5-3.7% ( That is, it increases by 1.4-1.5 times).

In addition to the above advantages, the refining method of the present invention can be used in the production of eutectic aluminum-silicon alloys. secondary aluminum contaminated with iron and titanium impurities due to Aluminum-silicon alloys can now be used, and iron and silicon can be used by the claimed method. Production of high-grade primary aluminum-silicon alloys is ensured by refining from aluminum and titanium. This allows for savings in primary aluminum and crystalline silicon.

industrial use The present invention is for refining eutectic aluminum-silicon alloys from iron and titanium impurities. Available in non-ferrous metallurgy and mechanical engineering, this smelting process alloy can be used as a primary or secondary It may be any of the characteristics.

Table 3 Nos parameter request method Example 4. Refining degree for iron 42.5 75.7 79.0 62.55, titanium Refinement level for? 0.0 90.0 90.0 87.5 Table 3 (continued) 1 98.4 98.0 98.0 97.3 97.2 93.5 B8.1 2 57.0 59.2 59.5 60.5 63.4 72.3 80.3 3 0.45 0.69 0.7 0.9 1.1 1.2 2.04 77' , 1 B1.5 55.0 73.5 80.5 27.5 65.05 92 ．． 85 94.0 80.0 87.1 92.0 67.5 75.06 3 ．． 9 3.7 3.7 3.6. 3.6 3.0 2.5 International search report

Claims (3)

[Claims] 1. Melting aluminum-silicon alloy with eutectic composition together with chromium and manganese The resulting melt is cooled to 590 to 660°C, and the cooled melt is The eutectic aluminum-silicon alloy is mixed with iron and In this method, the chromium and manganese are refined from chromium and titanium impurities. At a weight ratio of manganese to (0.2-1.1):1, these total weights to iron and The amount used is such that the ratio of the total weight of titanium and titanium impurities is (0.2-1.1):1. The method described above. 2. Chromium and manganese, their total weight versus the total weight of iron and titanium impurities When used in an amount such that the ratio of (0.2-0.69):1, The claimed method is characterized in that the weight ratio of aluminum to manganese is maintained at (0.5-20):1. An aluminum-silicon alloy having a eutectic composition described in range (1) is combined with iron and titanium. A method of refining from impurities. 3. Chromium and manganese, their total weight versus the total weight of iron and titanium impurities When used in an amount such that the ratio of chromium is (0.7-1.1):1, Claims characterized in that the weight ratio of manganese to manganese is maintained at (0.1-0.4):1. Iron- and titanium-free aluminum-silicon alloys having the eutectic composition described in item 1. A method of refining from pure materials.