阅读说明：本技术 一种利用赤泥铁粉生产硅铝铁合金的方法 (Method for producing ferro-silico-aluminum alloy by using red mud iron powder ) 是由 韩亮 曹成 郭庆 于 2020-06-12 设计创作，主要内容包括：本申请提供了一种利用赤泥铁粉生产硅铝铁合金的方法,首先将赤泥铁粉、从赤泥中回收的二氧化硅粉末、还原剂以及催化剂按照配比进行配料混合均匀,然后将配料混合均匀后的混合粉料在造球机中制成生球团,再然后将生球团送入隧道窑中进行还原焙烧,随炉冷却完成后制得硅铝铁合金；经实践证明,该方法制得的所述硅铝铁合金包括以下质量百分数的组分：5％～7％的Al,6％～10％的Si,余量的Fe以及不可避免的杂质；从而实现了利用赤泥铁粉生产硅铝铁合金,且具有工艺成熟可靠、投资小见效快、产品质量高且稳定、设备运行平稳、操作简单等优势。(The application provides a method for producing a ferro-silico-aluminum alloy by using red mud iron powder, which comprises the steps of firstly, uniformly mixing the red mud iron powder, silicon dioxide powder recovered from red mud, a reducing agent and a catalyst according to a ratio, then preparing green pellets from the mixed powder after uniformly mixing the ingredients in a pelletizer, then sending the green pellets into a tunnel kiln for reduction roasting, and preparing the ferro-silico-aluminum alloy after furnace cooling; practice proves that the silicon-aluminum-iron alloy prepared by the method comprises the following components in percentage by mass: 5-7% of Al, 6-10% of Si, and the balance of Fe and inevitable impurities; therefore, the ferrosilicon-aluminum alloy is produced by utilizing the red mud iron powder, and the method has the advantages of mature and reliable process, small investment, quick response, high and stable product quality, stable equipment operation, simple operation and the like.)

1. A method for producing ferro-silico-aluminum alloy by using red mud iron powder is characterized by comprising the following steps in sequence:

1) preparing materials: uniformly mixing red mud iron powder, silicon dioxide powder recovered from red mud, a reducing agent and a catalyst according to a ratio;

2) pelletizing: uniformly mixing the ingredients in the step 1) to obtain mixed powder, and preparing the mixed powder into green pellets in a pelletizer;

3) roasting: and (3) conveying the green pellets prepared in the step 2) into a tunnel kiln for reduction roasting, wherein the tunnel kiln is in a reducing atmosphere, cooling along with the furnace after roasting is finished, and taking out of the kiln after cooling along with the furnace is finished to prepare the ferro-silico-aluminum alloy.

2. The method for producing the ferro-silico-aluminum alloy by using the red mud iron powder according to claim 1, wherein in the step 1), the content of TFe in the red mud iron powder is 45-50 wt%;

the reducing agent is activated carbon;

the catalyst is aluminum powder, and the content of aluminum element in the aluminum powder is 99.0-99.9 wt%;

the weight of the red mud iron powder is (84-89) weight of the reducing agent, (8-12) weight of the reducing agent, (10-12) weight of the catalyst, and (1-4) weight of the silicon dioxide powder recovered from the red mud.

3. The method for producing ferro-silico-aluminum alloy from red mud iron powder according to claim 1, wherein in step 2), the green pellets have a particle size of 3mm to 5 mm.

4. The method for producing the ferro-silico-aluminum alloy by using the red mud iron powder as claimed in claim 1, wherein in the step 3), the fuel gas used in roasting is one or two of natural gas and water ion active fuel gas.

5. The method for producing the ferro-silico-aluminum alloy by using the red mud iron powder as claimed in claim 1, wherein in the step 3), the roasting temperature is 1000-1200 ℃ and the roasting heat preservation time is 60-90 h.

6. The method for producing the ferro-silico-aluminum alloy by using the red mud iron powder as claimed in claim 1, wherein in the step 3), the ferro-aluminum alloy comprises the following components in percentage by mass: 5 to 7 percent of Al, 6 to 10 percent of Si, and the balance of Fe and inevitable impurities.

Technical Field

The invention relates to the technical field of resource recycling, in particular to a method for producing ferro-silico-aluminum alloy by using red mud iron powder.

Background

Red mud is an industrial solid waste discharged when alumina is extracted in the aluminum industry, and is called red mud because of its large iron oxide content and appearance similar to that of red mud. Red mud is an insoluble residue that can be divided into sintering process red mud, bayer process red mud, and combination process red mud.

Iron in red mud is mainly Fe₂O₃Mainly, it contains a small amount of FeO. Currently, the research on the recovery of iron from red mud is relatively extensive and there are already well established processes, such as: reducing, roasting and magnetic separation to recover iron. The red mud iron powder is a powdery material which is rich in iron and contains other elements and is obtained by recovering iron from red mud.

The ferro-silico-aluminum alloy is a deoxidizer used in steel-making production, can improve the form of inclusions, reduce the content of gas elements in molten steel, and is an effective new technology for improving the quality of steel, reducing the cost and saving aluminum. Compared with pure aluminum deoxidation, the ferro-silico-aluminum alloy is used as a composite deoxidizer, and under the premise of ensuring the final oxygen content level and the mechanical property of the steel which are the same as those of the pure aluminum deoxidation, the ferro-silico-aluminum alloy not only obtains obvious aluminum saving effect (saving 40-50 percent of aluminum compared with the pure aluminum), but also improves the pouring performance of partial molten steel, greatly reduces phenomena such as nozzle nodulation and the like, has high aluminum yield, is easy to control the residual aluminum amount, and improves the form of inclusions.

Therefore, how to produce the ferro-silico-aluminum alloy by using the red mud iron powder is a technical problem which needs to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a method for producing ferro-silico-aluminum alloy by using red mud iron powder.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a method for producing ferro-silico-aluminum alloy by using red mud iron powder comprises the following steps in sequence:

1) preparing materials: uniformly mixing red mud iron powder, silicon dioxide powder recovered from red mud, a reducing agent and a catalyst according to a ratio;

2) pelletizing: uniformly mixing the ingredients in the step 1) to obtain mixed powder, and preparing the mixed powder into green pellets in a pelletizer;

3) roasting: and (3) conveying the green pellets prepared in the step 2) into a tunnel kiln for reduction roasting, wherein the tunnel kiln is in a reducing atmosphere, cooling along with the furnace after roasting is finished, and taking out of the kiln after cooling along with the furnace is finished to prepare the ferro-silico-aluminum alloy.

Preferably, in the step 1), the content of TFe in the red mud iron powder is 45-50 wt%;

the reducing agent is activated carbon;

the catalyst is aluminum powder, and the content of aluminum element in the aluminum powder is 99.0-99.9 wt%;

the weight of the red mud iron powder is (84-89) weight of the reducing agent, (8-12) weight of the reducing agent, (10-12) weight of the catalyst, and (1-4) weight of the silicon dioxide powder recovered from the red mud.

Preferably, in the step 2), the particle size of the green pellets is 3 mm-5 mm.

Preferably, in step 3), the fuel gas used in roasting is one or both of natural gas and water ion active fuel gas.

Preferably, in the step 3), the roasting temperature is 1000-1200 ℃ and the roasting heat preservation time is 60-90 h.

Preferably, in step 3), the silicon-aluminum-iron alloy comprises the following components in percentage by mass: 5 to 7 percent of Al, 6 to 10 percent of Si, and the balance of Fe and inevitable impurities.

The application provides a method for producing a ferro-silico-aluminum alloy by using red mud iron powder, which comprises the steps of firstly, uniformly mixing the red mud iron powder, silicon dioxide powder recovered from red mud, a reducing agent and a catalyst according to a ratio, then preparing green pellets from the mixed powder after uniformly mixing the ingredients in a pelletizer, then sending the green pellets into a tunnel kiln for reduction roasting, and preparing the ferro-silico-aluminum alloy after furnace cooling;

practice proves that the silicon-aluminum-iron alloy prepared by the method comprises the following components in percentage by mass: 5-7% of Al, 6-10% of Si, and the balance of Fe and inevitable impurities;

therefore, the ferrosilicon-aluminum alloy is produced by utilizing the red mud iron powder, and the method has the advantages of mature and reliable process, small investment, quick response, high and stable product quality, stable equipment operation, simple operation and the like.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate the features and advantages of the invention and not to limit the scope of the claims.

The application provides a method for producing a ferro-silico-aluminum alloy by using red mud iron powder, which comprises the following steps in sequence:

1) preparing materials: uniformly mixing red mud iron powder, silicon dioxide powder recovered from red mud, a reducing agent and a catalyst according to a ratio;

2) pelletizing: uniformly mixing the ingredients in the step 1) to obtain mixed powder, and preparing the mixed powder into green pellets in a pelletizer;

3) roasting: and (3) conveying the green pellets prepared in the step 2) into a tunnel kiln for reduction roasting, wherein the tunnel kiln is in a reducing atmosphere, cooling along with the furnace after roasting is finished, and taking out of the kiln after cooling along with the furnace is finished to prepare the ferro-silico-aluminum alloy.

In an embodiment of the present application, in step 1), the content of TFe in the red mud iron powder is 45 wt% to 50 wt%, and preferably, the red mud iron powder further includes 10 wt% to 15 wt% of Al₂O₃1 to 3 weight percent of Na₂3 to 5 weight percent of TiO₂；

The content of the silica in the silica powder recovered from the red mud is preferably 50 to 80 wt%;

the reducing agent is activated carbon;

the catalyst is aluminum powder, and the content of aluminum element in the aluminum powder is 99.0-99.9 wt%;

the weight of the red mud iron powder is (84-89) weight of the reducing agent, (8-12) weight of the reducing agent, (10-12) weight of the catalyst, and (1-4) weight of the silicon dioxide powder recovered from the red mud.

In one embodiment of the present application, in step 2), the green pellets have a particle size of 3mm to 5 mm.

In one embodiment of the present application, in step 3), the fuel gas used in the roasting is one or both of natural gas and water ion active fuel gas.

In one embodiment of the application, in the step 3), the roasting temperature is 1000-1200 ℃ and the roasting heat preservation time is 60-90 h.

In one embodiment of the present application, in step 3), the silicon-aluminum-iron alloy comprises the following components in percentage by mass: 5-7% of Al, 6-10% of Si, and the balance of Fe and inevitable impurities; preferably, the silicon-aluminum-iron alloy comprises the following components in percentage by mass: 5 to 7 percent of Al, 6 to 10 percent of Si, more than zero and not more than 0.20 percent of Mn, more than zero and not more than 0.20 percent of C, more than zero and not more than 0.02 percent of P, more than zero and not more than 0.02 percent of S, and the balance of Fe and inevitable impurities.

For further understanding of the present invention, the method for producing sialon by using red mud iron powder according to the present invention is described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.