阅读说明：本技术 一种提高真空铝回收率的冶炼方法 (smelting method for improving vacuum aluminum recovery rate ) 是由 邓建军 李建朝 李样兵 李�杰 赵国昌 袁锦程 吴艳阳 龙杰 柳付芳 牛红星 尹 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种提高真空铝回收率的冶炼方法,属于钢铁冶金技术领域。本发明包括真空VD工序。所述真空VD工序包括将真空总渣量控制至5-8kg/吨钢,渣层厚度控制至155-165mm,降低渣中SiO<Sub>2</Sub>含量至10-12%,真空破坏过程充氮气320-350kg/h防止空气进入,同时调整氩气流量至30.5-32NL/min,确保渣层不被吹开。本发明真空过程铝回收率由原来的20%-45%提高到70%-75%,铝合金回收率明显提高,具有广泛的应用价值。(the invention discloses a smelting method for improving the recovery rate of vacuum aluminum, which belongs to the technical field of ferrous metallurgy and comprises a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag to 5-8 kg/ton steel, controlling the thickness of a slag layer to 155-165mm, reducing the content of SiO 2 in slag to 10-12%, filling 320-350kg/h of nitrogen in the vacuum destruction process to prevent air from entering, and simultaneously adjusting the flow of argon to 30.5-32NL/min to ensure that the slag layer is not blown away.)

1. A smelting method for improving the recovery rate of vacuum aluminum is characterized by comprising a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag, the thickness of a slag layer, reducing the content of SiO ₂ in slag, filling nitrogen in the vacuum destruction process and adjusting the flow of argon.

2. The smelting method for improving the vacuum aluminum recovery rate according to claim 1, wherein the vacuum VD process is characterized in that the total vacuum slag amount is controlled to 5-8 kg/ton steel, and the slag layer thickness is controlled to 155-165 mm.

3. the smelting method for improving the vacuum aluminum recovery rate according to claim 1, wherein the vacuum VD process is used for controlling the content of SiO ₂ in the slag to 10-12%.

4. The smelting method for improving the vacuum aluminum recovery rate as claimed in claim 1, wherein the vacuum VD process, the vacuum destruction process is performed by introducing nitrogen gas 320-350kg/h while adjusting the argon flow to 30.5-32 NL/min.

Technical Field

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a smelting method for improving the recovery rate of vacuum aluminum.

Background

For the fine grain killed steel which uses Al element as final deoxidation, the technical requirement has definite specification on the aluminum content. For example, the Al element in the chromium-molybdenum steel reaches 0.018-0.050%, and the steel is generally considered to meet the requirement of fine-grain killed steel. However, from the statistical results of steel works in China at present, Al deoxidized fine-grained killed steel which needs vacuum treatment, and aluminum wires which are fed into molten steel before VD vacuum treatment have the aluminum alloy recovery rate of only 20% -45% due to the influence of air, slag quantity, slag layer thickness, slag components and the like. Even after certain measures or methods are adopted, the recovery rate is only close to 50 percent, the recovery rate is not obviously improved, a large amount of Al alloy is wastefully consumed, and the smelting period is inevitably prolonged. In some steel mills, the aluminum recovery rate is maintained in vacuum, and even a large amount of aluminum wires are fed after the vacuum is finished, so that the product is not scrapped due to excessive flaw detection of aluminum inclusions, and the loss is huge. Therefore, on the basis of not influencing the final quality of molten steel, the practical improvement of the vacuum aluminum recovery rate becomes one of the main problems which are urgently needed to be solved by steel mills at present.

Disclosure of Invention

The invention aims to provide a smelting method for improving the recovery rate of vacuum aluminum, and particularly relates to a steelmaking method capable of improving the recovery rate of vacuum aluminum alloy and reducing smelting cost and smelting period.

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

A smelting method for improving the recovery rate of vacuum aluminum comprises a vacuum VD process, wherein the vacuum VD process comprises the steps of controlling the total amount of vacuum slag, the thickness of a slag layer, reducing the content of SiO ₂ in slag, filling nitrogen in the vacuum destruction process and adjusting the flow of argon.

Preferably, in the vacuum VD step, the total vacuum slag amount is controlled to be 5-8 kg/ton steel, the thickness of a slag layer is controlled to be 155-165mm, steel slag reaction is facilitated, secondary oxidation of the molten steel and consumption of aluminum oxygen reaction are prevented, the molten steel is ensured to be fully stirred, and slag overflow and steel overflow are prevented.

Preferably, in the vacuum VD process, the content of SiO ₂ in the slag is controlled to 10-12%, and the content of SiO ₂ in the slag is reduced by controlling the slag components, so that the alkalinity of the slag is improved, and the consumption of the chemical reaction of aluminum and SiO ₂ is finally reduced.

Preferably, in the vacuum VD procedure, the vacuum destruction process is filled with 320-350kg/h of nitrogen, so as to prevent air from entering, and simultaneously, the flow of argon is adjusted to 30.5-32NL/min, so as to ensure that the slag layer is not blown away.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

1. In the traditional vacuum treatment process, if the slag amount and the slag layer thickness are not controlled well, a part of fed aluminum is oxidized and consumed, and is wasted, aluminum entering molten steel is greatly influenced by slag components, the low alkalinity in slag can promote the reaction of Al and SiO ₂, so that the loss of Al alloy is increased, and when the air is filled in the slag layer or the argon flow is improperly controlled in the vacuum destruction process, the oxygen absorption of the slag layer is even caused, so that the secondary oxidation of the molten steel is further promoted, so that the loss of the Al alloy is further intensified;

2. The recovery rate of the aluminum in the vacuum process is improved to 70-75% from the original 20-45%, the recovery rate of the aluminum in the vacuum process is greatly improved, the purpose of reducing the consumption cost of the aluminum alloy is realized, and the method has wide application value.

Detailed Description

The present invention will be described in further detail with reference to specific examples.