Blast furnace burden structure with high vanadium-titanium and high ball ratio and smelting method thereof

Abstract

The invention discloses a high-vanadium-titanium high-pellet-ratio blast furnace burden structure and a smelting method thereof, relates to the technical field of blast furnace smelting, and solves the problems that in an existing blast furnace vanadium-titanium magnetite smelting method, the pellet proportion in a blast furnace burden structure is low, and the blast furnace burden structure is poor. The furnace charge structurally comprises the following components in percentage by weight: 46-48% of vanadium-titanium sintered ore, 2.5-3.5% of raw ore and 49-51% of vanadium-titanium pellets. The smelting method comprises the following steps that S1, raw materials of a furnace charge structure are added into a blast furnace for material distribution; and S2, the smelting air temperature is adjusted to the preset temperature, the blast furnace air inlet amount is adjusted to be the preset air amount, the oxygen enrichment rate is adjusted to be the preset oxygen enrichment rate, and a finished product is obtained through smelting. By optimizing the furnace burden structure and the smelting method, the proportion of pellets in the furnace burden structure is increased, meanwhile, the quality of finished products is improved, and the blast furnace burden structure with the high vanadium-titanium and high pellet ratio and the smelting method of the blast furnace burden structure are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace smelting, and in particular to a blast furnace charge structure with high vanadium and titanium and high spherical ratio and a smelting method thereof. Background Art

[0002] As we all know, in the field of blast furnace smelting technology, pellets have gradually gained attention in China in recent years due to their uniform particle size, high strength, good metallurgical properties, high grade, good quality stability, low S content, low process emissions, low smelting costs and many other advantages. In European and American blast furnaces, 90% of the pellet smelting level has been achieved, and all technical and economic indicators and costs are superior to blast furnace structures with other charge structures.

[0003] However, the existing technologies in my country are all for general ore smelting, and are equipped with alkaline pellet materials. Compared with the particularity of vanadium-titanium ore smelting, there are great differences in raw material types and smelting modes. Therefore, the proportion of pellets in blast furnace smelting with vanadium-titanium ore as the main charge is less than 40%. The existing technologies have the problems of low proportion of pellet ore in the blast furnace charge structure and poor blast furnace charge structure. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low proportion of pellets in the blast furnace charge structure and poor blast furnace charge structure in the existing method for smelting vanadium-titanium magnetite in the blast furnace. The present invention provides a blast furnace charge structure with high vanadium-titanium and high ball ratio and a smelting method thereof. By optimizing the charge structure and the smelting method, the proportion of pellets in the charge structure is increased, and the quality of the finished product is improved at the same time, thereby realizing the provision of a blast furnace charge structure with high vanadium-titanium and high ball ratio and a smelting method thereof.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A blast furnace charge structure with high vanadium-titanium and high pellet ratio, wherein the raw materials of the charge structure include, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pelletized ore.

[0007] Furthermore, the vanadium-titanium pellets include, by weight percentage, 34-36% of self-produced vanadium-titanium pellets and 14-16% of purchased vanadium-titanium pellets.

[0008] Furthermore, the compressive strength of the self-produced vanadium-titanium pellets is 2300-2500N / piece.

[0009] Furthermore, the compressive strength of the purchased vanadium-titanium pellets is 1700-2000N / piece.

[0010] Furthermore, the vanadium-titanium sintered ore contains 1.4-1.6% manganese powder.

[0011] The present invention also provides a smelting method for a blast furnace charge structure with high vanadium and titanium content and high spherical ratio, the smelting method comprising the following steps: S1, adding raw materials of the charge structure into a blast furnace for distribution; S2, adjusting the smelting molten iron temperature to a preset molten iron temperature, adjusting the blast furnace wind speed to a preset wind speed, adjusting the oxygen enrichment rate to a preset oxygen enrichment rate, and smelting to obtain a finished product.

[0012] Optionally, the charge structure comprises, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pellets.

[0013] Optionally, the preset molten iron temperature is 1430-1470°C.

[0014] Optionally, the preset wind speed is 260-280m / s.

[0015] Optionally, the preset oxygen enrichment rate is 4.5-5.5%.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. The blast furnace charge structure with high vanadium-titanium and high ball ratio involved in the present invention can reduce the ore consumption cost, improve the blast furnace feeding grade and increase the output by optimizing the charge structure, and at the same time increase the vanadium content in the molten iron, increase the vanadium recovery in steelmaking, and achieve better economic benefits. The problem of low proportion of pellets in the blast furnace charge structure and poor blast furnace charge structure in the existing method of smelting vanadium-titanium magnetite in the blast furnace is solved.

[0018] 2. The present invention relates to a smelting method for a blast furnace charge structure with a high vanadium-titanium and high ball ratio. By optimizing the charge structure and the smelting method, the proportion of pellet ore in the charge structure is increased, and the molten iron temperature, smelting wind speed and oxygen enrichment rate are optimized, thereby improving the quality of the finished product.

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. DETAILED DESCRIPTION

[0021] The invention provides a blast furnace charge structure with high vanadium-titanium and high pellet ratio. The raw materials of the charge structure include, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pelletized ore.

[0022] Specifically, the raw materials of the charge structure preferably include, by weight percentage, 47% vanadium-titanium sintered ore, 3% raw ore, and 50% vanadium-titanium pelletized ore.

[0023] It is understandable that by optimizing the charge structure, the proportion of pellets is high, the ore consumption cost can be reduced, the blast furnace feed grade can be increased to increase production, and at the same time, the vanadium content in molten iron can be increased, and the vanadium recovery in steelmaking can be increased, which can achieve better economic benefits. The problem of low proportion of pellets in the blast furnace charge structure and poor blast furnace charge structure in the existing method of smelting vanadium-titanium magnetite in blast furnace is solved.

[0024] In some embodiments of the present invention, the vanadium-titanium pellets include, by weight percentage, 34-36% self-produced vanadium-titanium pellets and 14-16% purchased vanadium-titanium pellets. Preferably, the pellets include, by weight percentage, 35% self-produced vanadium-titanium pellets and 15% purchased vanadium-titanium pellets.

[0025] It can be understood that the present invention optimizes the charge structure and the ratio of vanadium-titanium pellets, with 34-36% of self-produced vanadium-titanium pellets combined with 14-16% of purchased vanadium-titanium pellets (commercially available), thereby achieving optimized adjustment of the charge structure, reducing ore consumption costs, increasing the grade of blast furnace input and increasing output, while increasing the vanadium content in molten iron, increasing the amount of vanadium recovered from steelmaking, and achieving better economic benefits.

[0026] In some embodiments of the present invention, the compressive strength of the self-produced pellets is 2300-2500N / piece.

[0027] In some embodiments of the present invention, the compressive strength of the conventional pellets is 1700-2000N / piece.

[0028] It can be understood that the present invention can ensure stable and smooth furnace conditions by optimizing the compressive strength of self-produced pellets and conventional pellets.

[0029] In some embodiments of the present invention, the conventional pellets are preferably commercially available curved hill pellets.

[0030] In some embodiments of the present invention, the vanadium-titanium sintered ore contains 1.4-1.6% manganese powder. Preferably, the sintered ore contains 1.5% manganese powder. By adding a certain amount of manganese powder to the sintered ore, the magnesium-aluminum ratio in the slag is ensured to be about 0.65, the fluidity of the slag and iron is improved, and the separation and discharge of the slag and iron are ensured to be smooth.

[0031] The present invention also provides a smelting method for a blast furnace charge structure with high vanadium and titanium content and high spherical ratio, the smelting method comprising the following steps: S1, adding raw materials of the charge structure into a blast furnace for distribution; S2, adjusting the smelting molten iron temperature to a preset molten iron temperature, adjusting the blast furnace wind speed to a preset wind speed, adjusting the oxygen enrichment rate to a preset oxygen enrichment rate, and smelting to obtain a finished product.

[0032] It can be understood that by optimizing the charge structure and smelting method, increasing the proportion of pelletized ore in the charge structure, and optimizing the molten iron temperature, smelting wind speed and oxygen enrichment rate, the quality of the finished product is improved.

[0033] In some embodiments of the present invention, the charge structure includes, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pellets.

[0034] In some embodiments of the present invention, the preset molten iron temperature is 1430-1470° C. The high wind temperature is used stably to ensure the theoretical combustion temperature before the tuyere, creating conditions for high ball ratio and high vanadium-titanium ratio smelting.

[0035] In some embodiments of the present invention, the preset wind speed is 260-280 m / s. The tuyere area is appropriately increased to increase the air intake of the blast furnace and maintain a reasonable wind speed and blast kinetic energy.

[0036] In some embodiments of the present invention, the preset oxygen enrichment rate is 4.5-5.5%. Increase the top pressure, appropriately increase the oxygen enrichment rate, strengthen smelting, achieve fast in and fast out, and avoid over-reduction of titanium during the high ball ratio and high vanadium-titanium ratio smelting process, which affects the furnace condition. In the smelting operation, low-silicon titanium smelting is adopted to avoid the production of "foamy" slag due to high furnace temperature, which affects the production rhythm inside and outside the furnace. Improve the quality of anhydrous cannon mud, ensure that the slag and iron are discharged in time, and create external conditions for keeping the wind in the furnace, so as to ensure the continuous advancement of the high ball ratio and high vanadium-titanium ratio smelting process.

[0037] Example 1

[0038] The charge structure is 55% vanadium-titanium sintered ore, 25% self-produced pellets, 20% conventional pellets, and 5% raw ore. The cost per ton of iron ore is 1,792.46 yuan.

[0039] Example 2

[0040] The charge structure is 55% sintered ore, 30% self-produced pellets, 15% conventional pellets, and 5% raw ore. The cost per ton of iron ore is 1,788.5 yuan.

[0041] Example 3

[0042] The charge structure is 50% sintered ore, 35% self-produced pellets, 15% conventional pellets, and 5% raw ore. The cost per ton of iron ore is 1,783.2 yuan.

[0043] Example 4

[0044] The charge structure is 47% sintered ore, 35% self-produced pellets, 15% conventional pellets, and 3% raw ore. The cost per ton of iron ore is 1,779.43 yuan.

[0045] Comparing Example 1 with Example 4, it can be seen that the cost of a ton of iron metal material can be saved by 13.03 yuan / ton of iron. Therefore, the blast furnace charge structure with high vanadium-titanium and high ball ratio of the present invention can reduce the cost of ore consumption, improve the grade of blast furnace input and increase production, and at the same time increase the vanadium content in molten iron, increase the amount of vanadium recovered in steelmaking, and have better economic benefits by optimizing the charge structure and having a high proportion of pelletized ore.

[0046] The above embodiment is only one implementation of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A blast furnace charge structure with high vanadium and titanium ratio, characterized in that: The raw materials of the furnace charge structure include, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pelletized ore.

2. A blast furnace charge structure with high vanadium and titanium ratio according to claim 1, characterized in that: The vanadium-titanium pellets include, by weight percentage, 34-36% of self-produced vanadium-titanium pellets and 14-16% of purchased vanadium-titanium pellets.

3. A blast furnace charge structure with high vanadium and titanium ratio according to claim 2, characterized in that: The compressive strength of the self-produced vanadium-titanium pellets is 2300-2500N / piece.

4. A blast furnace charge structure with high vanadium and titanium ratio according to claim 2, characterized in that: The compressive strength of the purchased vanadium-titanium pellets is 1700-2000N / piece.

5. The blast furnace charge structure with high vanadium and titanium and high spherical ratio according to claim 1, characterized in that: The vanadium-titanium sintered ore contains 1.4-1.6% manganese powder.

6. The smelting method of a blast furnace charge structure with high vanadium and titanium and high spherical ratio according to any one of claims 1 to 5, characterized in that: The smelting method comprises the following steps: S1, adding raw materials of the charge structure into the blast furnace for distribution; S2, adjusting the smelting molten iron temperature to a preset molten iron temperature, adjusting the blast furnace wind speed to a preset wind speed, adjusting the oxygen enrichment rate to a preset oxygen enrichment rate, and smelting to obtain a finished product.

7. The smelting method of a blast furnace charge structure with high vanadium and titanium and high spherical ratio according to claim 6, characterized in that: The furnace charge structure comprises, by weight percentage, 46-48% vanadium-titanium sintered ore, 2.5-3.5% raw ore, and 49-51% vanadium-titanium pelletized ore.

8. The smelting method of a blast furnace charge structure with high vanadium and titanium and high spherical ratio according to claim 6, characterized in that: The preset molten iron temperature is 1430-1470°C.

9. The smelting method of a blast furnace charge structure with high vanadium and titanium and high spherical ratio according to claim 6, characterized in that: The preset wind speed is 260-280m / s.

10. The smelting method of a blast furnace charge structure with high vanadium and titanium and high spherical ratio according to claim 6, characterized in that: The preset oxygen enrichment rate is 4.5-5.5%.