JPH01501008A - Method for producing an aluminum-silicon alloy having a silicon content of 2 to 22% by mass - 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] Method for producing an aluminum-silicon alloy having a silicon content of 2 to 22% by mass Technical field The present invention relates to the metallurgy of non-ferrous metals and alloys, and more particularly to metallurgy of non-ferrous metals and alloys with silicon content between 2 and 2. The present invention relates to a method for producing an aluminum-silicon alloy having a mass of 96. This alloy is Useful in the production of molded castings for the automotive industry, tractor production and consumer goods production. Something can happen.

Background technology Silica gold II 2-22 mass consisting of separately crushing alumina and silicon % is known in the art. Charge material carbonaceous materials and crushed alumina and silicon using calculated amounts of ingredients Prepared from A briquette is then prepared from the charge and placed in an ore reduction furnace. outfit As a result of the reduction of the input materials, a -order aluminum-silicon alloy is obtained. Next, this one The alloy prepared in this manner is then refined to remove non-metallic inclusions and processed into construction aluminum. Mini-silicon alloy (1. A, h Roidski, V, A, Zelle Tzenov, “Metallurgy of Aluminum J, 1977, “Metal lurglya) J Publishing II House, Moscow, pp. 5368-3 (See page 75).

This prior art method has a low assimilation degree and It has the disadvantage of insufficient quality of the alloy obtained. This method also requires a high level of Characterized by slag formation and significant heat loss (up to 10%) due to slag formation ing. This method is multi-stage and requires high power consumption rates.

The crushed crystalline silicon was separated into two fractions: a 20-50 fin fraction and a 0. 3-1.0 20~50 m+s (20~50 m+s) Iron is dissolved in liquid aluminum at a temperature within the range of 780-820°C and placed in a reverberatory furnace. Silicon-containing ff12 consisting of preparing an aluminum-silicon molten metal by stirring with Methods for producing aluminum-silicon alloys having ~22% by weight are known in the art. C.M., B., Aldman, A.A., Lebedev, M.

■, Chukurov, “Melting and casting of light alloys”, 1969, “Metal Lugya” Publishing House, Moscow, pp. 270-271).

Said method reduces the content of non-metallic inclusions (aluminum oxide and hydrogen); Guarantees a high degree of assimilation of silicon as well as high quality of the alloy. Furthermore, the method Allows to reduce the amount. The method is easy to implement and does not require high power consumption. do not.

When crushing crystalline silicon, both 20 and 50 fractions have an average yield of 95%, while , 0.3 to 1.0 are known to have an average of 4.5%. Said In the method, 0. 3-1. 0 fin fraction is aluminum – The non-use of these hard-to-obtain raw materials without finding any use in the preparation of silicon alloys. resulting in productive losses.

Disclosure of invention The present invention relates to the production of aluminum-silicon alloys having a silicon content of 2 to 22% by mass. to enable the use of crystalline silicon in fractions of 0.3 to 1.0 in thus eliminating the loss of hard-to-obtain raw materials and improving the quality of the prepared alloys. The present invention relates to the provision of modified process conditions for the dissolution of crystalline silicon.

This task involved separating crushed crystalline silicon into fractions of 20 to 501 cm and 0.3 to 1.0 + a + *, and the crystalline silicon in both parts of 20 to 50 is separated from 780 to Aluminum is dissolved in liquid aluminum at a temperature in the range of 820°C and stirred in a reverberatory furnace. having a silicon content of 2 to 22% by mass, including preparing a mini-silicon melt; A method for producing an aluminum-silicon alloy comprising a fraction of 20 to 50+i+*. Simultaneously with the dissolution of crystalline silicon, a fraction of 0.3 to 1.0+ll11 of crystalline silicon by a jet of inert gas in an amount of 3 to 10% by weight of the total material of crystalline silicon. 2 to 22% by mass of silicon blue gold II is introduced below the liquid level of the molten metal. Solved by providing a method for producing an aluminum-silicon alloy (the first bad ball) be done.

This problem is further solved by separating the crushed crystalline silicon into two fractions, a 20-50 fraction and a 0.3-1. The crystalline silicon from both 20 and 50 mm was separated into 78 mm fractions. Dissolved in liquid aluminum at a temperature within the range of 0-820℃ and stirred in a reverberatory furnace. Preparing an aluminum-silicon alloy with a silicon content of 2 to 22 mass 96 A method for producing an aluminum-silicon alloy having a fraction of 20 to 50 mm. The dissolution of crystalline silicon is carried out together with crystalline silicon for both 0.3 and 1.0 times, respectively. 80-85: carried out with a fraction mass ratio equal to 20-15, and before its dissolution 0 ．． Crystalline silicon in the 3-1.0 mm fraction was treated with barium chloride and sodium chloride and 7:1 to 2:1 with potassium chloride-based fluxes respectively Crystalline silicon, barium chloride and fluoride in fractions of 0.3 to 1.0 equal to 3 having a silicon content of 2 to 22% by mass, characterized in that it is compressed according to the mass ratio of This problem can also be solved by providing a method for producing aluminum-silicon alloys (the second evil ball). Ru.

The method according to the present invention (its aspects) uses crystalline silicon with both 063 and 1.0 functionalities. of raw materials, thereby making it possible to eliminate the loss of hard-to-obtain raw materials. Furthermore , the method according to the invention reduces the content of non-metallic inclusions (hydrogen and aluminum oxide). Because of this, it is possible to obtain higher quality alloys.

The crystalline silicon in the fraction of 0.3 to 1.0 mm is converted to the crystalline silicon in the fraction of 20 to 50 mm. At the same time as the element is dissolved, the inert gas jet is introduced below the level of the molten metal. (first embodiment of the method) ensures a long residence time of the fine fraction of silicon in the molten metal bulk i.e. the residence time is sufficient to dissolve the fine fraction into the melt before it reaches the melt surface. become. Furthermore, when the inert gas passes through the molten metal, it removes nonmetallic inclusions ( hydrogen and aluminum oxide).

0, 3-1.0 mm of crystalline silicon on both sides with barium chloride and flux. Due to the fact that they are pressed together (second thought of the method), the density is higher than that of the molten metal. A compression molded material with a density is obtained (this means that the surface of the molten metal has a density of 0.3 to 1 ．． Eliminate floating on both sides of 0). As a result, both parts of 20 to 50 m+e and 0. 3-1. Carrying out joint dissolution of crystalline silicon in the 0+am fraction becomes possible. The presence of flux in the composition of the pressed material results in Reducing the content of hydrogen and aluminum oxide in aluminum-silicon alloys and make it possible.

In carrying out the preparation of aluminum-silicon alloys with 2-22% by weight of silicon Both crystalline silicon particles with a particle size of 20 to 50++ us are dissolved during their dissolution. is found to be the most optimal for the method according to the invention, since it guarantees a minimum loss of elements. Served.

As mentioned above, when crushing crystalline silicon in the 20-50 mm fraction, the yield of the latter is On average, the yield is 95%, while the yield for both 0.3-1.0+im is on average 4 ．． It is 5%. 0. 3-1. ]ll1m was conventionally made of aluminum It was not used in the production of elementary alloys. This results in the loss of raw materials that are difficult to obtain. resulting in t;. The present invention uses both ratios of 0.3 to 1.0 to produce aluminum silicon. The present invention relates to a method for manufacturing a base alloy.

The method according to the present invention comprises converting crystalline silicon into a liquid atom at a temperature within the range of 780-820°C. Including dissolving in aluminum. This melting temperature depends on the specific operating characteristics of the reverberatory furnace. and by the conditions of the method of manufacturing the alloy in the furnace.

According to the first aspect of the method according to the present invention, the crystallinity of both parts of 0.3 to 1.0+I1m Silicon is reduced by a jet of inert gas to less than 3% of the total mass of the silicon charge. introducing an amount of The introduction of an inert carrier gas in an amount greater than 10% of the total raw charge resulting in an increase in the rate of consumption.

In a second embodiment of the method according to the invention, between 20 and 50 degrees of crystalline silicon and Both parts of 0.3~1.0■ are equal to the mass ratio of 80~85:20~15. Each is used. The upper limit of the above ratio is 0.3 to 1.0 mm of crystalline silicon. If used in an amount exceeding 0.3 to 1.0 + a + * and flux Twenty things lead to the need to increase the amount of barium chloride used for compression together. This is undesirable because it causes an undesirable increase in the viscosity of the molten metal. 0.3~1.0 degree The use of crystalline silicon in amounts less than the lower limits limits the efficiency of the process. This is not desirable because it reduces the quality.

In a second embodiment of the method according to the invention, a fraction of crystalline particles of 0.3 to 1.0 mm is prepared. Iron with barium chloride and flux in a ratio of 7:1 to 2:1 to 3, respectively. Press at the correct mass ratio. The selection of barium chloride and the lower limit of flux is By ensuring that the minimum density of the compact exceeds the density of aluminum: It is stipulated that That is, 7 to 2. 4g/cI11, γ2-2-48g/d , γ is the density of liquid aluminum, and 72 is the density of the compact.

The upper limit of barium chloride and flux in the above ratio is barium chloride and Further increases in flux content result in an undesirable increase in melt viscosity and flux It is defined by producing unproductive consumption of

BEST MODE FOR CARRYING OUT THE INVENTION In a first embodiment of the method according to the invention, aluminum having a silicon content of 2 to 22% by weight The aluminum-silicon alloy is manufactured in the following manner.

Separate the crushed crystalline silicon into 20-50mm and 0.3-1.0m+* sections. After that, the 20-50 mm fraction is charged into a reverberatory furnace. Then the required amount of liquid aluminum Charge the furnace at a temperature within the range of 780-820°C.

20 to 50 parts of crystalline silicon are dissolved in liquid aluminum under stirring at the above temperature. Then, an aluminum-silicon alloy is prepared as follows. Stirring, for example, the US company Centrifugal pumps, gas dynamic pumps, and electromagnetic stirring devices available from "Carborundum" (A, D, Andreev, V, B, Gorlin, G.S.

Makarov, “Highly Productive Smelting of Aluminum Alloys”, 1980, “Metal Lugia ” Publishing House, Moscow, pp. 89-95).

Simultaneously with the dissolution of crystalline silicon in the 20-50 mm fraction, 0.3-1.0 m+s The crystalline silicon fraction is purified by a jet of inert gas such as nitrogen or argon. Crystalline silicon is introduced below the melt level in an amount of 3 to 10% by weight of the total charge. 0 ．． of a jet of inert gas in a mixture with crystalline silicon in the 3-1.0 mm fraction. Preparation takes place in a fluidized bed apparatus. Both crystalline silicon of 0.3~1.0+I1m When the molten metal is introduced below the liquid level by a jet of inert gas, the molten metal volume is Due to the long residence time, complete dissolution of the silicon in this fraction occurs.

The readiness of the alloy depends on the results of a rapid analysis of the main components and impurity content of the alloy. The final alloy is then cast into a mold.

In a second embodiment of the method according to the invention, a silicon content of from 2 to 22% by weight is provided. The aluminum-silicon alloy is manufactured in the following manner.

The crushed crystalline silicon is separated into fractions of 20-50 mm and 0.3-1.0 mm.

Then, 0.3 to 1. 0 lung fraction of crystalline silicon from 7:1 to 2:1, respectively. Compact with barium chloride (bulking compound) and flux equal to 3. centre For example, 52-57% by mass of NaCl and 30-35% by mass of KC A mixture consisting of I and 10 to 15 materials 96 N a S iF 6 can be used. Ru. Then crystalline silicon in fractions 20-501111 and 0.3-1.0+ The product compact containing a fraction of crystalline silicon of 20 to 50 mm The mass ratio of both silicon components of 0.3 to 1.0+n is 80 to 85:20 to 15, respectively. Charge in an amount equal to . Then, add the required amount of liquid aluminum to 780-8 Charge the furnace at a temperature of 20°C, and add the crystalline silicon on both sides to the liquid aluminum. Into melting is performed at the above temperature with stirring to prepare an aluminum-silicon molten metal. . Under these conditions of the process, both 0.3 and 1.0 mm of silicon are deposited in the molten metal bath. Because of the long residence time in the tank, it has enough time to become soluble.

The stirring is carried out in the same manner as described in the first embodiment of the method according to the invention.

The readiness of the produced alloy is determined by the rapid analysis of the main components and impurity content of the alloy. As determined by the results, the final alloy is then cast into molds.

For a better understanding of the invention, some specific examples are provided below to illustrate certain aspects. vinegar.

Example 1 (first embodiment of the method according to the invention) After separating the crushed crystalline silicon into fractions of 20-50 and 0.3-1.0, 2 , 20~50 kg of the amount of 650 kg with a capacity of 25,000 kg based on liquid metal. charged into a reverberatory furnace. Next, liquid aluminum 22, 25 Q l (g Cast into a furnace at a temperature of 800°C. Dissolution of crystalline silicon of 20 to 50+ oe The aluminum-silicon melt is prepared in liquid aluminum at the above temperature with stirring. Prepare.

Stirring is performed using an electromagnetic stirrer.

Simultaneously with the dissolution of crystalline silicon in the fraction of 20-5C1++m, 0.3-1.0ml 270 kg of crystalline silicon (270 kg of silicon) was removed by a jet of nitrogen. 10% by mass of the total charge material) and is introduced below the liquid level of the molten metal. Calculated amount of silicon in alloy is 11.7% by mass. Crystalline silicon in a fraction of 0.3 to 1.0 When the silicon is introduced below the liquid level of the molten metal by jet, the silicon in the fraction is completely dissolved. occurs.

The readiness of the alloy depends on the results of a rapid analysis of the main components and impurity content of the alloy. The final alloy with a silicon content of 11.4% by weight is then cast into a mold. .

The following example illustrates the implementation of the method according to the invention in its first embodiment in said reverberatory furnace. It is shown in Table 1.

;To sadness 1 lead size [F] Example 1 (second embodiment of the method according to the invention) Separate crushed crystalline silicon into fractions of 20-50+am and 0.3-1.0 . Then, an amount of 584 kg of crystalline silicon in a fraction of 0.3 to 1.0 compressed together with 166.8 kg of aluminum and 250.2 kg of flux (silicon The mass ratio of the fraction to barium chloride and flux is 7:2:3, respectively. ). The flux was 52% by weight NaCl, 34% by weight KCI and 14% by weight. It consists of a mixture consisting of N a 2 S iF 6. It is then measured as a liquid metal. Capacity when calculated: 25. 2,336kg of 20~50cm in a 000kg reverberatory furnace Formation containing both crystalline silicon and 0.3 to 1.0 m+s of silicon Charge together with compressed material. 20-50mm silicon bipartite vs. 0. 3-1. C1 The mass ratio of both mm of silicon is equal to 80:20, respectively. ke in the alloy The calculated amount of ion is 11.7% by mass. Next, liquid aluminum 22 is placed in the furnace. 250kg of crystalline silicon was charged at a temperature of 800°C, and the crystalline silicon was added to both sides of the aluminum. The aluminum-silicon molten metal is prepared by melting the joint at the above temperature with stirring. make Under these conditions of the process, 0. From the fraction of ~1.0+++m Due to the long residence time in the bulk of the molten metal, the ion has sufficient Have time.

The stirring is carried out using an electromagnetic stirring device.

The readiness of the alloy depends on the results of a rapid analysis of the main components and impurity content of the alloy. The final alloy with a silicon content of 11.4 and 896 was then cast into a mold. nothing.

The following example of implementation of the method according to the invention in the second embodiment in the reverberatory furnace is shown in Table 2.

In these examples, the 7 lux described in Example 1 of the second embodiment of the method is used.

Prisoner C'-] Be The efficiency of the process according to the invention (both embodiments) depends on the hydrogen and aluminum oxide content According to the results of alloy analysis of It was evaluated based on the raw degree of assimilation.

The content of hydrogen and aluminum oxide in the alloy is M.

Book by B. Aldman, A., A. Lebedev, M., V. Chukurov, “Light alloys "Smelting and Casting", 1969, "Metalrugya" Publishers, Mosque It is measured according to the method described on pages 663 to 674.

The degree of assimilation of crystalline silicon in the fraction from 0.3 to 1.0++n is the same for both methods according to the invention. In the case of the first embodiment, the measurement is performed using the following method.

First, the method was carried out using only a fraction of silicon with a size between 20 and 50+a+*. do. As a result, an aluminum-silicon alloy with a predetermined silicon content is obtained. (C1).

Then, in a mass ratio of 20 to 50, corresponding to the first or second embodiment of the method according to the invention. The method was carried out using both dragon silicon fractions and 0.3 to 1.0 dragon silicon fractions. give

As a result, an aluminum-silicon alloy with a certain content of silicon is obtained ( C2). In both aspects of the method, the calculated amount of silicon in the alloy is the same. Ta.

Degree of assimilation of crystalline silicon (Y) between 0.3 and 1.0 dragons.

%) is the following formula Calculate by.

In the formula, C is an alloy obtained using crystalline silicon with a fraction of 20 to 50+n+e. The content of silicon (mass %) in C2 is 20~5'0++n and 0. Content of silicon in the alloy obtained using crystalline silicon with a fraction of 3-1.0 mm (mass%).

The method according to the invention and the prior art in both aspects measured by known methods The efficiency characteristics of the surgical method are shown in Table 3 below.

Comparative analysis of the data in Table 3 above shows that the use of the method according to the invention (both aspects) The hydrogen content in the final alloy is reduced by an average of 30% and the aluminum oxide content is reduced. It shows that on average it is possible to reduce by 37%.

The method according to the present invention can be used in a range of 0.3 to 1. Using crystalline silicon in the Om+s fraction and thus eliminates the loss of hard-to-obtain raw materials. Table 3 shows the fine image It is shown that a high degree of assimilation of silicon in minutes is guaranteed. That is, in the prior art method It is substantially equal to the degree of silicon assimilation between 20 and 50 degrees.

Industrial applicability The present invention uses an aluminum-silicon alloy having silicon blue ff 12 to 22% by mass. May find application in the technology of metallurgy for the production of non-ferrous metals and alloys. Wear. The alloys are used in the production of molded castings for the automobile and tractor industries, as well as in the consumer It can be used in the production of consumer goods.

Compliance investigation report

Claims (2)

[Claims] 1. The crushed crystalline silicon is separated into fractions of 20-50 mm and 0.3-1 ．． The crystalline silicon in the 20 to 50 mm fraction was separated from 780 to 82 mm. Aluminum is dissolved in liquid aluminum at a temperature within the range of 0°C and stirred in a reverberatory furnace. Aluminum-silicon melt having a silicon content of 2 to 22% by weight 1. A method for producing a silicon alloy containing crystalline silicon in a fraction of 20 to 50 mm. At the same time, the crystalline silicon of the 0.3-1.0 mm fraction is dissolved into the total crystalline silicon. In an amount of 3 to 10% by weight of the charge material, below the melt surface by a jet of inert gas, Aluminum with a silicon content of 2 to 22% by weight, characterized in that Method of manufacturing silicon alloys. 2. The crushed crystalline silicon is separated into fractions of 20-50 mm and 0.3-1 ．． The crystalline silicon in the 20 to 50 mm fraction was separated from 780 to 82 mm. Aluminum is dissolved in liquid aluminum at a temperature within the range of 0°C and stirred in a reverberatory furnace. preparing an aluminum-silicon alloy having a silicon content of 2 to 22% by weight; 1. A method for producing a silicon alloy containing crystalline silicon in a fraction of 20 to 50 mm. of the said dissolution, together with a fraction of 0.3-1.0 mm of crystalline silicon, respectively 8 carried out with a mass ratio of fractions equal to 0-85:20-15, and before its dissolution 0.3-1 ．． 0 mm fraction of crystalline silicon with barium chloride and sodium and potassium 7:1 to 2:1 to 3, respectively, with chloride-based fluxes of Crystalline silicon vs. barium chloride vs. flux quality in the 0.3-1.0 mm fraction Aluminum with a silicon content of 2 to 22% by mass, characterized by compaction by weight ratio Method for producing umium-silicon alloy.