阅读说明：本技术 一种高炉使用钒钛磁铁精矿的方法 (Method for using vanadium-titanium magnetite concentrate in blast furnace ) 是由 谢洪恩 胡鹏 于 2020-12-08 设计创作，主要内容包括：本发明提供了一种高炉使用钒钛磁铁精矿的方法,包括：在高炉冶炼的过程中,将钒钛磁铁精矿从风口喷入。在高炉冶炼的过程中,本申请钒钛磁铁精矿通过喷吹的方式自风口加入,可以减少高炉渣在滴落带的数量；降低滴落带高炉渣的TiO-2含量、提高CaO含量,从而增大炉渣的表面张力。因此,这种方法可以减少在冶炼过程中生成的碳氮化钛和炉渣在焦炭柱中的滞留率,从而改善焦炭柱的透气透液性。(The invention provides a method for using vanadium-titanium magnetite concentrate in a blast furnace, which comprises the following steps: in the blast furnace smelting process, vanadium-titanium magnetite concentrate is sprayed from a tuyere. In the blast furnace smelting process, the vanadium-titanium magnetite concentrate is added from an air port in a blowing mode, so that the quantity of blast furnace slag in a dripping zone can be reduced; TiO for reducing dripping zone blast furnace slag 2 And increasing the CaO content, thereby increasing the surface tension of the slag. Therefore, the method can reduce the retention rate of titanium carbonitride and slag generated in the smelting process in the coke column, thereby improving the permeability of the coke column.)

1. A method for using vanadium-titanium magnetite concentrate in a blast furnace comprises the following steps:

in the blast furnace smelting process, vanadium-titanium magnetite concentrate is sprayed from a tuyere.

2. The method according to claim 1, wherein in the blast furnace smelting process, the oxygen enrichment rate is 2-7%, and the coal injection ratio is 80-150 kg/t.

3. The method according to claim 1, wherein the raw material of the sinter ore comprises vanadium-titanium concentrate, general fine ore, activated ash, limestone, coke powder and anthracite coal in the blast furnace smelting process.

4. The method according to claim 3, wherein the vanadium-titanium concentrate is 35-45 wt%, the common concentrate is 0-15 wt%, the common fine ore is 20-40 wt%, the active ash is 6-8 wt%, the limestone is 4-6 wt%, the coke powder is 3-6 wt%, and the anthracite is 0.5-2 wt%.

5. The method of claim 1, wherein the blast furnace raw material comprises coke, blown coal, sintered ore, common lump ore, vanadium-titanium pellet and vanadium-titanium concentrate during the blast furnace smelting.

6. The method according to claim 5, wherein the content of the coke is 14.5-16.0 wt%, the content of the pulverized coal is 3.5-5.0 wt%, the content of the sintered ore is 45-55 wt%, the content of the common lump ore is 0-5 wt%, the content of the vanadium-titanium pellet ore is 30-40 wt%, the content of the vanadium-titanium concentrate ore is 50-73 wt%, and the sum of the raw materials is 100 wt%.

7. The method according to any one of claims 1 to 6, wherein the vanadium titano-magnetite is added in an amount of not more than 100 kg/t.

8. The method according to claim 1, wherein the vanadium-titanium magnetite concentrate has a-200 mesh size fraction of 80-90%.

Technical Field

The invention relates to the technical field of blast furnace ironmaking, in particular to a method for using vanadium-titanium magnetite concentrate in a blast furnace.

Background

TiO-based vanadium titano-magnetite for Panxi area of China₂The content is high. The Pan steel uses the vanadium titano-magnetite concentrate in Panxi area as the main iron-containing raw material and TiO in blast furnace slag₂The content of the slag exceeds 20 percent, and the slag belongs to typical high titanium type blast furnace slag. Due to TiO₂High content, easy to generate TiC, TiN and their solid solutions Ti (C, N) which can not be melted under the condition of blast furnace smelting, to make the slag thickened and deteriorated in fluidity, and to damage the normal production of blast furnace, and to cause abnormal furnace condition in serious cases. According to the results of blast furnace dissection, in the blast furnace smelting process, the zone of reflow to the tuyere plane, i.e., the drip zone, is the main area for Ti (C, N) generation. Thus, the reduction of TiO dripping from the blast furnace₂The content is one of measures to reduce the generation of Ti (C, N).

Generally, a blast furnace takes vanadium-titanium sintered ore and vanadium-titanium pellet ore as main raw materials to be fed into the furnace. Even if the quantity of the vanadium-titanium magnetite concentrate entering the blast furnace from the pellet is increased, the vanadium-titanium sinter proportion is reduced, thereby reducing the TiO of the sinter₂Content, TiO content entering the hearth from the top of the blast furnace cannot be reduced₂In a content not reducing TiO dripping with blast furnace slag₂And (4) content. Secondly, the steel-climbing blast furnace has low furnace-entering grade, large slag quantity and poor permeability and liquid permeability of the reflow belt. The amount of the slag iron entering the blast furnace from the furnace top is reduced, the amount of the slag iron in the dripping zone can be reduced, and the air permeability and liquid permeability of the dripping zone are improved.

Disclosure of Invention

The invention aims to provide a method for using vanadium-titanium magnetite concentrate in a blast furnace, which can reduce the amount of slag in a dripping zone and reduce TiO₂And (4) content.

In view of the above, the present application provides a method for using vanadium-titanium magnetite concentrate in a blast furnace, comprising:

in the blast furnace smelting process, vanadium-titanium magnetite concentrate is sprayed from a tuyere.

Preferably, in the process of blast furnace smelting, the oxygen enrichment rate is 2-7%, and the coal injection ratio is 80-150 kg/t.

Preferably, in the blast furnace smelting process, the raw materials of the sinter comprise vanadium-titanium concentrate, common fine ore, active ash, limestone, coke powder and anthracite.

Preferably, the content of the vanadium-titanium concentrate is 35 wt% -45 wt%, the content of the common concentrate is 0 wt% -15 wt%, the content of the common fine ore is 20 wt% -40 wt%, the content of the active ash is 6 wt% -8 wt%, the content of the limestone is 4 wt% -6 wt%, the content of the coke powder is 3 wt% -6 wt%, and the content of the anthracite is 0.5 wt% -2 wt%.

Preferably, in the blast furnace smelting process, the blast furnace raw materials comprise coke, blown coal powder, sintered ore, common lump ore, vanadium-titanium pellet ore and vanadium-titanium concentrate ore.

Preferably, the content of the coke is 14.5 wt% -16.0 wt%, the content of the blowing coal powder is 3.5 wt% -5.0 wt%, the content of the sinter is 45 wt% -55 wt%, the content of the common lump ore is 0 wt% -5 wt%, the content of the vanadium-titanium pellet ore is 30 wt% -40 wt%, the content of the vanadium-titanium concentrate ore is 50 wt% -73 wt%, and the sum of the raw materials is 100 wt%.

Preferably, the addition amount of the vanadium titano-magnetite does not exceed 100 kg/t.

Preferably, the particle size of the vanadium-titanium magnetite concentrate is-200 meshes, and the particle size fraction is 80-90%.

The application provides a method for using vanadium-titanium magnetite concentrate in a blast furnace, wherein the vanadium-titanium magnetite concentrate is sprayed from a tuyere in the blast furnace smelting process. In the process of blast furnace smelting, the vanadium-titanium magnetite concentrate is blown from the tuyere, so that TiO entering the blast furnace from the top of the blast furnace can be reduced₂Thereby reducing the dripping of TiO with blast furnace slag₂The content of Ti (C, N) is reduced.

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 features and advantages of the invention, and not to limit the scope of the claims.

In view of TiO in vanadium titano-magnetite in the prior art₂The application provides a method for using vanadium-titanium magnetite concentrate in a blast furnace, wherein vanadium-titanium magnetite is introduced into a tuyere in a blowing mode, and TiO dripping with blast furnace slag is reduced₂The content of Ti (C, N) is reduced. Specifically, the application provides a method for using vanadium-titanium magnetite concentrate in a blast furnace, which comprises the following steps:

in the blast furnace smelting process, vanadium-titanium magnetite concentrate is sprayed from a tuyere.

In the application, partial vanadium-titanium magnetite concentrate is blown from a tuyere, so that TiO entering the blast furnace from the top of the blast furnace can be reduced₂Thereby reducing the dripping of TiO with blast furnace slag₂Content, reduce the generation of Ti (C, N).

After the mineral separation process, the-200 mesh fraction in the vanadium-titanium magnetite concentrate can reach more than 90 percent, for example, SiO is further treated₂、MgO、Al₂O₃When impurities are selected out, thenFurther fine grinding is needed, and the granularity of the concentrate is further thinned. The granularity of the injected coal powder is usually about 80 percent of minus 200 meshes, so that the granularity of the vanadium-titanium magnetite concentrate in the application is 80 to 90 percent of minus 200 meshes, and the requirement of blast furnace injection can be met.

The vanadium-titanium magnetite concentrate is sprayed from the tuyere, and the heat consumption of the hearth area is increased due to the direct reduction of the iron oxide; the theoretical combustion temperature and the heat supply in the tuyere region can be increased by increasing the oxygen enrichment and the coal injection ratio. Under the condition of keeping the fuel ratio unchanged, the coke consumption can be also reduced properly. More specifically, in the application, the oxygen enrichment rate is 2% -10%, and the coal injection ratio is 80-150 kg/t.

According to vanadium-titanium magnetite concentrate TiO₂The content is different, the consumption of each ton of iron ore of the Panzhi blast furnace is about 1800-1900 kg/t, and the vanadium-titanium ore accounts for about 65-80% of the iron ore, namely the consumption of each ton of iron ore is about 1170-1520 kg/t of the vanadium-titanium magnetite concentrate. And (2) spraying part of the vanadium-titanium magnetite concentrate and the spraying coal powder into the blast furnace from the tuyere, and when the coal powder and coke are combusted in front of the tuyere to form CO and release heat, the CO reduces the iron oxide in the iron concentrate into FeO or metallic iron, and simultaneously melts the metallic iron and slagging components. The amount of the vanadium-titanium magnetite concentrate to be blown can be different according to the difference of the air temperature, the oxygen-rich amount and the amount of the pulverized coal to be blown, but generally the amount of the vanadium-titanium magnetite concentrate to be blown can not exceed 100kg/t iron.

In the application, in the blast furnace smelting process, the raw materials of the sinter comprise vanadium-titanium concentrate, common fine ore, active ash, limestone, coke powder and anthracite; more specifically, the present invention is to provide a novel,

the vanadium-titanium concentrate content is 35 wt% -45 wt%, the common concentrate content is 0 wt% -15 wt%, the common fine ore content is 20 wt% -40 wt%, the active ash content is 6 wt% -8 wt%, the limestone content is 4 wt% -6 wt%, the coke powder content is 3 wt% -6 wt%, and the anthracite content is 0.5 wt% -2 wt%. In the blast furnace smelting process, the blast furnace raw materials comprise coke, blown coal powder, sinter, common lump ore, vanadium-titanium pellet ore and vanadium-titanium concentrate ore; more specifically, the content of the coke is 14.5 wt% to 16.0 wt%The content of the blown coal powder is 3.5-5.0 wt%, the content of the sinter is 45-55 wt%, the content of the common lump ore is 0-5 wt%, the content of the vanadium-titanium pellet ore is 30-40 wt%, the content of the vanadium-titanium concentrate ore is 50-73 wt%, and the total amount of the raw materials is 100 wt%. In the blast furnace smelting process, the vanadium-titanium magnetite concentrate is added from an air port in a blowing mode, so that the quantity of blast furnace slag in a dripping zone can be reduced; reduction of TiO in blast furnace slag₂And increasing the CaO content, thereby increasing the surface tension of the slag. Therefore, the method can reduce the retention rate of titanium carbonitride and slag generated in the smelting process in the coke column, thereby improving the permeability of the coke column.

In order to further understand the present invention, the method for using vanadium-titanium magnetite concentrate in a blast furnace provided by 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.

Example 1

Table 1 shows the main chemical components and the proportions of the main raw fuel produced by sintering, wherein the vanadium-titanium concentrate can be used as a blowing concentrate; table 2 shows the sintering burden structure when the concentrate is not blown and when the concentrate is blown; table 3 shows the blast furnace raw material consumption and chemical composition when the concentrate is not blown; table 4 shows the blast furnace raw material consumption and chemical composition when blowing the concentrate.

TABLE 1 main chemical composition of sintering raw materials%

Group of	Proportioning	TFe	FeO	SiO2	CaO	MgO	Al2O3	V2O5	TiO2
										Vanadium-titanium concentrate 1	41.95	56.21	27.30	3.49	0.57	3.30	3.55	0.689	10.21
General concentrate	14.40	62.12	17.14	1.16	3.77	2.37	0.23		0.14
										Vanadium-titanium concentrate 2	3.00	55.35	31.52	3.60	0.93	2.51	3.49	0.64	11.47
Ordinary fine ore 1	6.50	64.07	0.72	4.24	0.18	0.06	1.99
										Ordinary fine ore 2	6.00	58.45	19.46	6.52	2.07	2.89	1.48	0.078
General fine ore 3	9.50	43.82	0.5	17.45	4.73	1.69	4.47		0.36
										Active ash	7.15			1.48	88.49	3.29	0.38
Limestone	6.50			2.66	52.44	2.04	0.33
										Coke powder	3.00	7.00		42.00	6.00	8.00	27.00
Anthracite coal	2.00	7.5		46.00	6.00	5.00	25.00

TABLE 2 sintering and proportioning structure without blowing concentrate and blowing concentrate

TABLE 3 blast furnace raw material consumption and chemical composition without blowing concentrate

TABLE 4 blast furnace raw material consumption and chemical composition at blowing of concentrate

As can be seen from tables 3 and 4, when the injection amount of the vanadium-titanium concentrate 2 reaches about 30kg/t, the amount and chemical composition of the sintered ore change under the condition that the amount of the vanadium-titanium pellet ore 1 and the amount of the common lump ore do not change much. When the concentrate is blown, the TiO of the sinter is reduced due to the reduction of the vanadium-titanium concentrate in the sintering process₂The content is reduced from 5.27% to 4.68%.

Table 5 shows the TiO content of the blast furnace slag without blowing concentrate and with blowing concentrate₂Content, basicity (w (CaO)/w (SiO)₂) ) and slag-iron ratio.

TABLE 5 TiO with slag dripping without blowing concentrate and blowing concentrate₂Content, basicity and slag-to-iron ratio

Group of	TiO2/％	R2	Slag to iron ratio/kg.t-1
				Concentrate without spraying	26.33	1.26	455.34
Spraying concentrate	25.81	1.28	443.96

As can be seen from Table 5, when the concentrate was blown from the tuyere up to about 30kg/t, it was blown due to partial TiO₂And slag forming components directly enter the hearth, the amount of slag and TiO in a dripping zone₂The content is obviously lower than that of the non-blowing case.

Example 2

Table 6 shows the main chemical components and the mixture ratio of the main raw fuel produced by sintering, wherein the vanadium-titanium concentrate can be used as a blowing concentrate; table 7 shows the sintering burden structure when concentrate is not blown and when concentrate is blown; table 8 shows the blast furnace raw material consumption and chemical composition when the concentrate is not blown; table 9 shows blast furnace raw material consumption and chemical composition when blowing concentrate;

TABLE 6 main chemical composition of sintering raw materials%

Group of	Proportioning	TFe	FeO	SiO2	CaO	MgO	Al2O3	V2O5	TiO2
										Vanadium-titanium concentrate 1	41.95	56.21	27.30	3.49	0.57	3.30	3.55	0.689	10.21
General concentrate	14.40	62.12	17.14	1.16	3.77	2.37	0.23		0.14
										Vanadium-titanium concentrate 2	3.00	55.35	31.52	3.60	0.93	2.51	3.49	0.64	11.47
Ordinary fine ore 1	6.50	64.07	0.72	4.24	0.18	0.06	1.99
										Ordinary fine ore 2	6.00	58.45	19.46	6.52	2.07	2.89	1.48	0.078
General fine ore 3	9.50	43.82	0.5	17.45	4.73	1.69	4.47		0.36
										Active ash	7.15			1.48	88.49	3.29	0.38
Limestone	6.50			2.66	52.44	2.04	0.33
										Coke powder	3.00	7.00		42.00	6.00	8.00	27.00
Anthracite coal	2.00	7.5		46.00	6.00	5.00	25.00

TABLE 7 sintering and proportioning structure without blowing concentrate and blowing concentrate

TABLE 8 blast furnace raw material consumption and chemical composition without blowing concentrate

TABLE 9 blast furnace raw material consumption and chemical composition when blowing concentrate

As can be seen from tables 8 and 9, when the injection amount of the vanadium-titanium concentrate 2 reaches about 100kg/t, the amount and chemical composition of the sintered ore change under the condition that the amount of the vanadium-titanium pellet ore 1 and the amount of the common lump ore do not change much. When the concentrate is blown, the TiO of the sinter is reduced due to the reduction of the vanadium-titanium concentrate in the sintering process₂The content is reduced from 5.27% to 4.22%.

TABLE 10 TiO of blast furnace slag without blowing concentrate and with blowing concentrate₂Content, basicity (w (CaO)/w (SiO)₂) ) and slag-iron ratio.

TABLE 10 TiO not blowing concentrate and dripping with slag while blowing concentrate₂Content, basicity and slag-to-iron ratio

As can be seen from Table 10, when the concentrate was blown from the tuyere up to about 30kg/t, it was blown due to partial TiO₂And slag forming components directly enter the hearth, the amount of slag and TiO in a dripping zone₂The content is obviously lower than that of the non-blowing case.

Example 3

Table 11 shows the main chemical components and the mixture ratio of the main raw fuel produced by sintering, wherein the vanadium-titanium concentrate can be used as a blowing concentrate; table 12 shows the sintering burden structure when concentrate is not blown and when concentrate is blown; table 13 shows the blast furnace raw material consumption and chemical composition when the concentrate is not blown; table 14 shows the blast furnace raw material consumption and chemical composition when blowing the concentrate.

TABLE 11 main chemical composition of sintering raw materials%

Name of raw materials	Proportioning	TFe	FeO	SiO2	CaO	MgO	Al2O3	V2O5	TiO2
										Vanadium-titanium concentrate 3	39.55	53.90	32.55	3.60	0.40	2.80	3.80	0.58	12.50
General concentrate	15.00	62.12	17.14	1.16	3.77	2.37	0.23		0.14
										Vanadium-titanium concentrate 2	3.00	55.35	31.52	3.60	0.93	2.51	3.49	0.64	11.47
Ordinary fine ore 1	6.00	64.07	0.72	4.24	0.18	0.06	1.99
										Ordinary fine ore 2	6.00	58.45	19.46	6.52	2.07	2.89	1.48	0.08
General fine ore 3	14.15	43.82	0.50	17.45	4.73	1.69	4.47		0.36
										Active ash	6.30			1.48	88.49	3.29	0.38
Limestone	5.00			2.66	52.44	2.04	0.33
										Coke powder	3.00	7.00		42.00	6.00	8.00	27.00
Anthracite coal	2.00	7.50		46.00	6.00	5.00	25.00

TABLE 12 sintering feed proportioning structure without blowing concentrate and blowing concentrate

TABLE 13 blast furnace raw material consumption and chemical composition without blowing concentrate

TABLE 14 blast furnace raw material consumption and chemical composition when blowing concentrate

As can be seen from tables 13 and 14, when the injection amount of the vanadium-titanium concentrate 3 reaches about 30kg/t, the amount and chemical composition of the sintered ore change under the condition that the amount of the vanadium-titanium pellet 2 and the amount of the common lump ore do not change much. When the concentrate is blown, the TiO of the sinter is reduced due to the reduction of the vanadium-titanium concentrate in the sintering process₂The content is reduced from 5.76% to 5.66%.

Table 15 shows the TiO content of the blast furnace slag without blowing concentrate and with blowing concentrate₂Content, basicity (w (CaO)/w (SiO)₂) ) and slag-iron ratio.

TABLE 15 TiO not blowing concentrate and dripping with slag while blowing concentrate₂Content, basicity and slag-to-iron ratio

Group of	TiO2/％	R2	Slag to iron ratio/kg.t-1
				Concentrate without spraying	26.98	1.36	489.81
Spraying concentrate	26.43	1.38	476.91

As can be seen from Table 15, when the concentrate was blown from the tuyere up to about 30kg/t, it was blown due to partial TiO₂And slag forming components directly enter the hearth, the amount of slag and TiO in a dripping zone₂The content is obviously lower than that of the non-blowing case.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.