阅读说明：本技术 一种超高TiO2炉渣的高炉冶炼方法 (Ultrahigh TiO (titanium dioxide)2Blast furnace smelting method of furnace slag ) 是由 姜喆 刘杰 朱建伟 张磊 车玉满 费静 郭天永 姚硕 李建军 曾宇 于 2021-08-19 设计创作，主要内容包括：本发明涉及一种超高TiO-(2)炉渣的高炉冶炼方法,高炉入炉炼铁原料中TiO-(2)的含量为6wt％～15wt％；高炉渣中MgO＜8wt％、Al-(2)O-(3)＜12wt％、TiO-(2) 30wt％～60wt％,二元碱度R2控制在0.3～0.6范围内。本发明可以使高炉渣中TiO-(2)含量提高到30～60wt％,从而极大地提高了低价高钛矿的使用比例,有利于大幅降低高炉炼铁成本,同时提高了高钛渣的产品附加值。(The invention relates to an ultrahigh TiO 2 Blast furnace smelting method of furnace slag, and TiO in blast furnace iron-making raw material 2 The content of (A) is 6 wt% -15 wt%; MgO in blast furnace slag is less than 8 wt%, Al 2 O 3 ＜12wt％、TiO 2 30-60 wt% and the binary alkalinity R2 is controlled within the range of 0.3-0.6. The invention can lead TiO in the blast furnace slag to be 2 The content is increased to 30-60 wt%, so that the use proportion of low-price high-titanium ore is greatly increased, the blast furnace ironmaking cost is greatly reduced, and the added value of high-titanium slag is increased.)

1. Ultrahigh TiO (titanium dioxide)₂The blast furnace smelting method of the furnace slag is characterized in that TiO in the blast furnace iron-making raw material₂The content of (A) is 6 wt% -15 wt%; MgO in blast furnace slag is less than or equal to 8 wt%, Al₂O₃＜12wt％、TiO₂30-60 wt% and the binary alkalinity R2 is controlled within the range of 0.3-0.6.

2. The ultra-high TiO of claim 1₂A blast furnace smelting method of furnace slag is characterized in that TiO in the blast furnace slag₂When the content is 30-40 wt%, controlling the blast furnace slagThe binary alkalinity R2 is 0.5-0.6, and the MgO content is controlled at 7-8 wt%.

3. The ultra-high TiO of claim 1₂A blast furnace smelting method of furnace slag is characterized in that TiO in the blast furnace slag₂When the content is 40-50 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.4-0.5, and the MgO content is controlled to be 6-7 wt%.

4. The ultra-high TiO of claim 1₂A blast furnace smelting method of furnace slag is characterized in that TiO in the blast furnace slag₂When the content is 50-60 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.3-0.4, and the MgO content is less than 6 wt%.

5. The ultra-high TiO as set forth in any one of claims 1 to 4₂The blast furnace smelting method of the furnace slag is characterized in that the ratio of coal powder injected into a blast furnace is less than 80 kg/thm; the theoretical combustion temperature before the tuyere is 2100-2200 ℃ and the slag temperature is 1500-1560 ℃.

Technical Field

The invention relates to a blast furnaceThe technical field of smelting, in particular to an ultrahigh TiO₂A blast furnace smelting method of furnace slag.

Background

The titanium-containing blast furnace slag is blast furnace slag generated by smelting vanadium titano-magnetite. The titanium-containing blast furnace slag is generally prepared from CaO, MgO and SiO₂、Al₂O₃、TiO₂Equal composition according to the TiO in the slag₂The content can be divided into: low titanium-containing blast furnace slag (TiO)₂Less than 10 percent) and medium titanium-containing blast furnace slag (TiO)₂10% -15%) and high-titanium-containing blast furnace slag (TiO)₂Up to about 24%). The foreign blast furnace smelting has lower content of titanic iron ore, and generally contains TiO₂Not more than 3 to 4 percent of TiO contained in blast furnace slag₂Generally less than 10 percent, so that special processing is not needed and the slag can be completely utilized as common blast furnace slag. Most of the iron ore resources in China are associated ores, so that high-slag vanadium-titanium ore can be generated during smelting of vanadium-titanium magnetite.

When the blast furnace is used for smelting vanadium-titanium magnetite by adopting domestic iron ore, TiO in blast furnace slag₂The content is high, and the problems of serious slag foaming and poor fluidity exist. Especially TiO in the slag when smelting all-vanadium-titanium ore₂About 30 percent, serious foam slag appears outside the furnace, and the phenomenon that the blast furnace can not discharge and clean slag iron exists, so that the blast furnace can not normally run. Therefore, slag foaming and poor metallurgical performance are the key problems to be solved most for realizing the smelting of the all-vanadium-titanium ore.

For the problems of foaming and fluidity of the titanium-containing blast furnace slag, a great deal of work has been done by the metallurgy workers in China for a long time, for example, in the production process, TiO in the slag is controlled by adding common ore₂Within 25 percent, the foaming phenomenon of the titanium-containing blast furnace slag can be basically controlled, and the normal blast furnace smelting of schreyerite is realized. However, this dilutes the TiO content of the slag₂The method for smelting the schreyerite ore reduces the using amount of the schreyerite ore and is difficult to greatly reduce the production cost of the blast furnace. At the same time, TiO in the diluted slag is adopted₂The method can greatly reduce the added value of the high titanium slag, brings difficulty to the wet production of titanium white in the later period, and causes the titanium-containing blast furnace slagCan not be recycled.

In recent years, some iron and steel enterprises have proposed a new method for using schreyerite in a large proportion in order to reduce the production cost of blast furnaces and reduce the dependence on imported iron ores:

chinese patent with publication number CN103276126B discloses a method for improving fluidity of high-titanium slag in blast furnace smelting vanadium-titanium magnetite, which comprises adding boron concentrate and vanadium-titanium ore into a blast furnace to make B in the slag₂O₃The content is controlled to be 0.8-1.3 wt%, so that the fluidity of the high titanium slag can be improved, and the slag-iron separation is facilitated; and the process is simple and is beneficial to industrial application. However, the method needs to add an additional fluxing agent, increases the production cost of blast furnace iron making, and is not beneficial to TiO in the high titanium slag in the later period₂The extraction and enrichment of (2).

Chinese patent application with the patent application number of CN202010195254.9 discloses a method for improving the performance of high titanium slag, which aims to adopt a method for greatly improving the blast furnace charging air quantity and the oxygen enrichment according to the titanium slag thickening mechanism, namely increasing the oxygen potential of a blast furnace hearth and inhibiting and reducing the reduction generation of high melting point TiC and TiN; by utilizing the characteristics of good fluidity and strong oxidizability of MgO and MnO, the contents of MgO and MnO in slag and R2 and R4 of slag are increased, so that the fluidity and the desulfurization capability of the slag are improved, and meanwhile, high-melting-point TiC and TiN generated by reduction are promoted to be oxidized; the narrower smelting temperature interval is controlled, the tapping frequency is increased, slag iron is discharged in time, and the retention time of the high titanium slag in the furnace is shortened to inhibit the formation of foam slag, so that the performance of the high titanium slag is successfully improved. However, the method needs to control the smelting temperature range within a narrow range, which increases the difficulty of blast furnace operation.

Disclosure of Invention

The invention provides an ultrahigh TiO₂The blast furnace smelting method of the furnace slag can lead TiO in the blast furnace slag₂The content is increased to 30-60 wt%, so that the use proportion of low-price high-titanium ore is greatly increased, the blast furnace ironmaking cost is greatly reduced, and the added value of high-titanium slag is increased.

In order to achieve the purpose, the invention adopts the following technical scheme:

ultrahigh TiO (titanium dioxide)₂Blast furnace smelting method of furnace slag, and TiO in blast furnace iron-making raw material₂The content of (A) is 6 wt% -15 wt%; MgO in blast furnace slag is less than or equal to 8 wt%, Al₂O₃＜12wt％、TiO₂30-60 wt% and the binary alkalinity R2 is controlled within the range of 0.3-0.6.

TiO in the blast furnace slag₂When the content is 30-40 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.5-0.6, and the MgO content is controlled to be 7-8 wt%.

TiO in the blast furnace slag₂When the content is 40-50 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.4-0.5, and the MgO content is controlled to be 6-7 wt%.

TiO in the blast furnace slag₂When the content is 50-60 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.3-0.4, and the MgO content is less than 6 wt%.

The ratio of coal powder injected into the blast furnace is less than 80 kg/thm; the theoretical combustion temperature before the tuyere is 2100-2200 ℃ and the slag temperature is 1500-1560 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1) can greatly increase low-price high TiO₂The use amount of the ore greatly reduces the cost of the raw materials fed into the blast furnace, thereby reducing the iron-making cost of the blast furnace;

2) fluxing agents such as fluorite, manganese ore and the like do not need to be added into the blast furnace burden;

3) TiO in blast furnace slag₂The content is greatly improved, and the added value of the high titanium slag product is improved.

Detailed Description

The invention relates to an ultrahigh TiO₂Blast furnace smelting method of furnace slag, and TiO in blast furnace iron-making raw material₂The content of (A) is 6 wt% -15 wt%; MgO in blast furnace slag is less than or equal to 8 wt%, Al₂O₃＜12wt％、TiO₂30-60 wt% and the binary alkalinity R2 is controlled within the range of 0.3-0.6.

TiO in the blast furnace slag₂When the content is 30-40 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.5-0.6, and MgOThe content is controlled to be 7 wt% -8 wt%.

TiO in the blast furnace slag₂When the content is 40-50 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.4-0.5, and the MgO content is controlled to be 6-7 wt%.

TiO in the blast furnace slag₂When the content is 50-60 wt%, the binary alkalinity R2 of the blast furnace slag is controlled to be 0.3-0.4, and the MgO content is less than 6 wt%.

The ratio of coal powder injected into the blast furnace is less than 80 kg/thm; by controlling the blast temperature, the oxygen enrichment rate and the coal powder injection amount, the theoretical combustion temperature before the tuyere is guaranteed to be 2100-2200 ℃, and the slag temperature is 1500-1560 ℃.

The invention relates to an ultrahigh TiO₂The blast furnace smelting method of the furnace slag has the following working principle: TiO 2₂Is an amphoteric oxide, and exhibits the function of an acidic oxide in an alkaline molten slag and the function of a basic oxide in an acidic molten slag. In blast furnace slag, TiO₂Will react with SiO which is also an acidic oxide₂And Al₂O₃Polymerizing into complex silicon-oxygen and aluminum-oxygen ion groups, and TiO in blast furnace slag₂At higher contents, the blast furnace slag exhibits increased viscosity, difficulty in flowing and foaming, and is therefore unsuitable for blast furnace smelting. However, the contents of CaO and MgO, which are basic oxides, in the liquid slag are reduced by optimizing the burden, and TiO is continuously increased₂In the content of TiO₂The effect of the basic oxide is exhibited. TiO in liquid slag₂Ionized free oxygen ions (O)^2-) And bridge oxygen (O)⁰) The interaction destroys the network structure of the slag, so that the polymerization degree in the slag is reduced, and the viscosity of the slag is reduced.

The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.

[ examples ] A method for producing a compound

In this example, TiO in the blast furnace ore₂The content is 6-15 wt%. The furnace charge material parameters, blast furnace control parameters and molten iron ingredients are shown in tables 1, 2 and 3, respectively.

In the following examples, comparative examples are control parameters for smelting ordinary high titanium slag, and examples 1 to 3 are control parameters of high titanium slag components and blast furnace by the method of the present invention.

TABLE 1 furnace feed parameters

TABLE 2 blast furnace control parameters

TABLE 3 blast furnace ironmaking water composition, wt%

Composition (I)	C	Si	S	P
					Comparative example	5.2	0.4	0.03	0.07
Example 1	4.9	0.4	0.08	0.08
					Example 2	4.8	0.5	0.09	0.08
Example 3	5.2	0.6	0.14	0.09

As can be seen from the comparison of the above examples with the comparative examples, the cost of molten iron is significantly reduced when the method of the present invention is used to smelt high titanium ore, and the components and yield of the molten iron are substantially maintained.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.