阅读说明：本技术 一种铝硅中间合金的生产工艺 (Production process of aluminum-silicon intermediate alloy ) 是由 陈福亮 木群花 尹冰晶 邱鹏瑞 黄卉 何猛 于 2020-06-01 设计创作，主要内容包括：本发明公开了一种铝硅中间合金的生产工艺,包括：液态金属硅准备,将金属硅冶炼完成,并准备释放液态金属硅；按比例称好铝锭,将称好的铝锭放入浇包或者铸模中,用浇包或者铸模准备接纳液态金属硅；打开炉门释放液态金属硅到浇包或者铸模中,直至浇包或者铸模充满；控制浇包或者铸模内的温度,利用人工或者机械搅动液态金属硅,混合均匀已熔化的金属铝,得到铝硅中间合金样品；取样分析铝硅中间合金的化学成分；达到合格标准后,将铝硅中间合金样品凝固冷却,然后脱模破碎装袋得到铝硅中间合金样品成品。本发明利用液态金属硅在凝固时的结晶潜热熔化金属铝,生产出铝合金熔炼时需要的铝硅中间合金,工艺简单,大幅降低生产成本,节能环保。(The invention discloses a production process of an aluminum-silicon intermediate alloy, which comprises the following steps: preparing liquid metal silicon, namely finishing the smelting of the metal silicon and preparing to release the liquid metal silicon; weighing aluminum ingots according to a proportion, putting the weighed aluminum ingots into a casting ladle or a casting mould, and preparing to receive liquid metal silicon by using the casting ladle or the casting mould; opening the furnace door to release liquid metal silicon into the casting ladle or the casting mould until the casting ladle or the casting mould is full; controlling the temperature in a casting ladle or a casting mold, stirring liquid metal silicon manually or mechanically, and uniformly mixing the molten metal aluminum to obtain an aluminum-silicon intermediate alloy sample; sampling and analyzing the chemical components of the aluminum-silicon intermediate alloy; and after the qualified standard is reached, solidifying and cooling the aluminum-silicon intermediate alloy sample, and then demoulding, crushing and bagging to obtain the finished product of the aluminum-silicon intermediate alloy sample. The method provided by the invention has the advantages that the crystallization latent heat of the liquid metal silicon during solidification is utilized to melt the metal aluminum, the aluminum-silicon intermediate alloy required during aluminum alloy smelting is produced, the process is simple, the production cost is greatly reduced, and the method is energy-saving and environment-friendly.)

1. The production process of the aluminum-silicon intermediate alloy is characterized by comprising the following steps of:

s1, preparing liquid metal silicon, finishing the smelting of the metal silicon, and preparing to release the liquid metal silicon;

s2, weighing aluminum ingots according to the proportion, putting the weighed aluminum ingots into a casting ladle or a casting mould, and preparing to receive liquid metal silicon by the casting ladle or the casting mould;

s3, opening the furnace door to release liquid metal silicon into the casting ladle or the casting mould until the casting ladle or the casting mould is full;

s4, controlling the temperature in the casting ladle or the casting mould, stirring the liquid metal silicon by manpower or machinery, and mixing the molten metal aluminum uniformly to obtain an aluminum-silicon intermediate alloy sample;

s5, sampling and analyzing the chemical components of the aluminum-silicon intermediate alloy;

and S6, solidifying and cooling the aluminum-silicon intermediate alloy sample after the qualified standard is reached, and then demoulding, crushing and bagging to obtain the finished product of the aluminum-silicon intermediate alloy sample.

2. The process for producing an Al-Si master alloy according to claim 1, wherein the ratio of the Al ingot to Si in S2 is 1:0.9-1: 1.1.

3. The process for producing an Al-Si master alloy according to claim 1, wherein the temperature in the casting ladle or the casting mould is controlled at 1400-1600 ℃ S4.

Technical Field

The invention belongs to the technical field of alloy production, and particularly relates to a production process of an aluminum-silicon intermediate alloy.

Background

Silicon is the first choice element for aluminum alloying, and silicon with different contents is added into the aluminum alloy, regardless of wrought aluminum alloy, cast aluminum alloy or other aluminum alloys, so that the mechanical and processing properties of the aluminum alloy are obviously improved, and the application range of the aluminum is greatly expanded through aluminum alloying.

There are two conventional methods for alloying aluminum by adding silicon to the aluminum, the first method: directly adding metallic silicon into the aluminum melt; the second method comprises the following steps: adding an aluminum-silicon intermediate alloy with the Si content of 20-25% into the aluminum melt. The first method is that molten aluminum is directly added into an aluminum smelter for smelting, after an aluminum ingot is melted by a smelting furnace to form molten aluminum, a certain amount of metallic silicon is directly added according to the silicon content required by the product, after 1-2 hours of smelting, molten slag is removed, and the melt is purified to obtain the alloy with the silicon content of 5-13 percent, which is mainly used for casting aluminum alloy with relatively high silicon content and less strict impurity requirement. The specific gravity of the silicon is 2.3, the specific gravity of the aluminum is 2.7, and because the specific gravity of the silicon is smaller than that of the aluminum, the metal silicon floats on the surface of the melt when the aluminum alloy is smelted and is not fully wrapped by the aluminum liquid, and the degree of the silicon being melted and absorbed into the alloy is low; secondly, the metal silicon generally contains about 1% of impurities, and when the metal silicon is added, the impurities enter the aluminum melt, so that the quality of the aluminum alloy is reduced; thirdly, because the melting point of the metallic silicon is 1414 ℃, the melting is mainly realized by overheating of aluminum liquid during melting, a silicon-aluminum solid solution is generated, and the melting furnace is heated to more than 1000 ℃ to ensure that the melting task is finished. The method increases the heating cost and the production period, has low alloying degree of silicon, the alloying degree of silicon is less than 98 percent, the loss of more metals in slag is large, particularly when the treatment capacity of a furnace is large, a special purifying device is required to be added to effectively ensure the product quality, and the method is adopted by most of domestic aluminum processing at present. And in the second method, the Al-Si intermediate alloy with the Si content of 5-13% is prepared by the first smelting method, and the Al-Si intermediate alloy with the corresponding amount is added when the aluminum alloy is smelted according to the silicon-containing ingredient required by the processed product. Because the aluminum liquid is added in a metal solid solution mode, the melting point of the intermediate alloy is 750 ℃, the melting point of the intermediate alloy is low and easy to melt, slagging is greatly reduced, the guarantee degree of the silicon content required by the melt is high, Si is close to 100% to absorb alloying, but the secondary melting increases the production cost and metal loss, and particularly when the furnace amount is large and the silicon content of the product is high, the added Al-Si alloy amount is large and accounts for 1/3 of the furnace amount, so that the production cost, the production period and the metal loss are undoubtedly increased.

The traditional production mode is adopted to produce the Al-Si intermediate alloy with high silicon content, namely: after molten aluminum is obtained by smelting, metallic silicon is put into the furnace in batches, pressed below molten aluminum, covered by fluxing agent, the temperature of the smelting furnace is raised to over 1200 ℃ until all the metallic silicon is melted, and the high-silicon-content aluminum intermediate alloy is cast. The production cost is high, the electricity cost for producing each ton of products is about 500 yuan, the metal loss is large, and the metal loss for producing each ton of products is about 3%. Therefore, a process for preparing the aluminum-silicon intermediate alloy with low cost and low energy consumption is urgently needed.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a production process of an aluminum-silicon intermediate alloy, which can be used for producing the aluminum-silicon intermediate alloy required by aluminum alloy smelting in an environment-friendly and low-cost manner.

In order to solve the technical problems, the invention adopts the technical scheme that:

a production process of an aluminum-silicon intermediate alloy comprises the following steps:

s1: preparing liquid metal silicon: finishing the smelting of the metal silicon and preparing to release liquid metal silicon;

s2: weighing aluminum ingots according to a ratio, and controlling the ratio of the aluminum ingots to silicon to be 1:0.9-1: 1.1; placing the weighed aluminum ingot into a casting ladle or a casting mould, and preparing to receive liquid metal silicon by using the casting ladle or the casting mould;

s3: opening the furnace door to release liquid metal silicon into the ladle or the casting mould; until the casting ladle or the casting mould is full;

s4: controlling the temperature in a casting ladle or a casting mould to 1400-1600 ℃, stirring liquid metal silicon by manpower or machinery, and uniformly mixing the molten metal aluminum; obtaining an aluminum-silicon intermediate alloy sample;

s5: sampling and analyzing the chemical components of the aluminum-silicon intermediate alloy;

s6: and after the qualified standard is reached, solidifying and cooling the aluminum-silicon intermediate alloy sample, and then demoulding, crushing and bagging to obtain the finished product of the aluminum-silicon intermediate alloy sample.

In the present invention, since the specific heat of silicon is not much different from the specific heat of aluminum, 0.19 cal/g.C., 0.22 cal/g.C., the liquid silicon is lowered from 2200 deg.C to a crystallization temperature of 1400 deg.C, which is sufficient to melt a considerable amount of aluminum metal, which has a melting point of 660 deg.C. The Al-Si intermediate alloy with the silicon content of 50-55% is produced by using the latent heat of crystallization in the process of pouring liquid metal silicon, so that the production cost is greatly reduced, the energy is saved, the environment is protected, the technical progress of aluminum processing is promoted, and good economic and social benefits are obtained.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

When the liquid metal silicon is cast into a finished product in a silicon smelting workshop, a calculated amount of metal aluminum is prepared in a casting ladle or a casting mould, and certain auxiliary measures are taken to melt the metal aluminum by utilizing the crystallization latent heat of the liquid metal silicon during solidification so as to produce the aluminum-silicon intermediate alloy required during aluminum alloy smelting. The process is simple, the production cost is greatly reduced, the energy is saved, the environment is protected, and the high-quality aluminum-silicon intermediate alloy can be produced.

The invention greatly improves the silicon content in the Al-Si intermediate alloy to 50-55%, reduces the addition of the intermediate alloy during the smelting of the aluminum alloy, and well inherits the advantage of adding the intermediate alloy for smelting, wherein the addition of the intermediate alloy is 1/7 of the furnace amount. The Al-Si intermediate alloy has the smelting temperature of 800 ℃ and the production period of 50 minutes, and can effectively reduce the smelting temperature and shorten the smelting production period.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

The invention relates to a production process of an aluminum-silicon intermediate alloy, which comprises the following specific operation processes: in a silicon metal smelting plant, after silicon metal smelting is finished, preparing to release liquid silicon metal and discharging the silicon metal; weighing aluminum ingots according to a ratio, and controlling the ratio of the aluminum ingots to silicon to be 1:0.9-1: 1.1; placing the weighed aluminum ingot into a casting ladle or a casting mould, and preparing to receive liquid metal silicon by using the casting ladle or the casting mould; opening the furnace door to release liquid metal silicon into the ladle or the casting mould; until the casting ladle or the casting mould is full; when the temperature in the casting ladle or the casting mould is more than 1500 ℃ in a liquid state, stirring the liquid metal silicon by manpower or machinery, and uniformly mixing the molten metal aluminum; obtaining an aluminum-silicon intermediate alloy sample; sampling and analyzing the chemical components of the aluminum-silicon intermediate alloy; and after the qualified standard is reached, solidifying and cooling the aluminum-silicon intermediate alloy sample, and then demoulding, crushing and bagging to obtain the finished product of the aluminum-silicon intermediate alloy sample.

On the basis of adding the Al-Si intermediate alloy, the content of silicon in the Al-Si intermediate alloy is greatly improved to 50-55%, the adding amount of the intermediate alloy during smelting of the aluminum alloy is reduced, the adding amount of the intermediate alloy is 1/7 of the furnace amount, and the advantage of adding the intermediate alloy for smelting is well inherited. The smelting temperature of the invention is 800 ℃, the production cycle of the invention is 50 minutes, the invention reduces the smelting temperature and shortens the production cycle.

Since the specific heat of silicon, 0.19 cal/g.c, is not very different from the specific heat of aluminum, 0.22 cal/g.c, liquid silicon is lowered from 2200 c to a crystallization temperature of 1400 c, sufficient to melt a substantial amount of metallic aluminum, which has a melting point of 660 c. The Al-Si intermediate alloy with the silicon content of 50-55% is produced by using the latent heat of crystallization in the process of pouring liquid metal silicon, so that the production cost is greatly reduced, the energy is saved, the environment is protected, the technical progress of aluminum processing is promoted, and good economic and social benefits are obtained.