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Blast furnace smelting method capable of lowering coke ratio and increasing coal ratio

A technology of blast furnace smelting and coal ratio, which is applied in the direction of blast furnace, blast furnace details, furnace, etc., can solve the problems of poor effect and poor coke ratio effect, and achieve the effect of easy promotion, reduction of coke ratio and increase of coal ratio

Inactive Publication Date: 2018-01-30
SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is directly used to increase the amount of cheap fuel pulverized coal instead of coke, thereby reducing the coke ratio and improving the utilization coefficient of the blast furnace, but the effect is not good, and the effect of reducing the coke ratio is poor

Method used

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  • Blast furnace smelting method capable of lowering coke ratio and increasing coal ratio
  • Blast furnace smelting method capable of lowering coke ratio and increasing coal ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of vanadium-titanium sintered ore treated with preparation: sinter inhibitor and water are mixed according to the mass ratio of 4:100 and then sprayed onto the surface of vanadium-titanium sintered ore to obtain vanadium-titanium sintered ore treated with sintering ore inhibitor; In total, the sinter inhibitor components include: calcium chloride 70%, magnesium chloride 12%, borax 10%, bromine 3%, penetrant 5%; the penetrant is fatty alcohol polyoxyethylene ether;

[0041] Optional iron charge and combustion aid: the formula is shown in Table 1; wherein, in terms of mass percentage, the mass fraction of active aluminum in the aluminum powder is not less than 98%.

[0042] According to Table 1, choose iron charge and combustion aid

[0043] Table 1

[0044]

Embodiment 2～16

[0046] Add diced coke to the iron charge of A~C, mix uniformly to form ore layers; alternately distribute coke and the ore layers into the blast furnace to form an alternate layered structure of the ore layers and the coke layers; Mix with pulverized coal to obtain a mixture; the mixture is expressed as N 2 As a transport medium, it is injected into the blast furnace for combustion; wherein, the particle size of the combustion accelerant is greater than 95% of those with a diameter of 0.015mm or less, and the particle size of the pulverized coal is 150-180 mesh

[0047]Control blast temperature to 1150~1250℃, oxygen enrichment>2500m 3 / h, make iron under the conditions shown in Table 2, calculate the iron content in the slag and the utilization coefficient of the blast furnace, and see Table 2 for the results.

[0048] Table 2

[0049]

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Abstract

The invention discloses a blast furnace smelting method capable of lowering coke ratio and increasing coal ratio. The blast furnace smelting method comprises the following steps: uniformly mixing vanadium-titanium sinter, vanadium-titanium pellets and coking ore processed by a sinter inhibitor to form an ore layer, wherein the vanadium-titanium sinter in the ore layer accounts for 60% to 80% of the total mass of iron furnace charge, and the vanadium-titanium pellets account for 20% to 40% of the total mass of the iron furnace charge; alternately distributing coke and the ore layer into a blastfurnace to form the alternate layer structure of the ore layer and the coke; mixing a combustion improver with pulverized coal to obtain a mixture; injecting the mixture into the blast furnace to becombusted; the combustion improver comprises 35% to 38% of calcium oxide, 25% to 35% of manganese dioxide, 22% to 25% of magnesium oxide and 8% to 12% of aluminum powder calculated in percentage by mass; the combustion improver accounts for 0.05 to 0.15% of the mass of coal calculated in percentage by mass; the technical indexes of the smelting process are that the coke ratio is 416 to 456 kg / tHM,the coking ratio is 115 to 150 kg / tHM, the coal ratio is 132 to 152kg / tHM, the blast temperature is 1150 to 1250 DEG C, and oxygen enrichment is greater than 2500m<3> / h; by adopting the blast furnacesmelting method, the coke ratio can be lowered, and the coal ratio and utilization coefficients of the blast furnace are increased.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace smelting method for reducing the coke ratio and increasing the coal ratio. Background technique [0002] Blast furnace iron smelting methods usually mainly include: sintering vanadium-titanium iron concentrate and ordinary fine ore to produce sinter, pelletizing vanadium-titanium iron concentrate and ordinary iron concentrate to produce pellets, and then sintering, pelletizing The lump ore is added to the blast furnace together with coke in a certain proportion, and at the same time, pulverized coal is injected through the tuyere of the blast furnace and air is blown in to burn the coke and the pulverized coal injected to generate reducing gas (mainly CO and H2). The reducing gas removes the oxygen in the vanadium-titanium magnetite during the process of rising in the furnace, reduces to obtain iron, and then melts and drops to the hearth to realize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B3/02
Inventor 江青芳刘德安林刚杨波何益先张杰闵荣辉
Owner SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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