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Blast furnace smelting method for vanadium-titanium magnetite

A vanadium-titanium magnetite and blast furnace smelting technology, which is applied in the field of iron ore smelting, can solve the problems of poor economic benefits and low price of iron ore concentrates, and achieve the effects of reducing impurities, promoting recycling, and improving grades

Inactive Publication Date: 2017-05-31
攀枝花市徳铭再生资源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the vanadium-titanium magnetite concentrate is smelted through a single magnetic separation method. The grade of the iron concentrate obtained after magnetic separation is always 60% to 61%, and the recovery rate is about 65%, so that the price of the iron concentrate is not high. Economic benefits are not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Take the limestone and crush it into limestone powder with particle size less than or equal to 0.07mm with a pulverizer;

[0029] B, carry out batching according to following weight ratio, iron ore concentrate: limestone powder: coal dust=300:3:0.8, adjust slag alkalinity simultaneously to be 1.5;

[0030] c. After mixing the limestone powder and coal powder, spray them into the combustion zone of the blast furnace through the blast furnace side tuyere branch pipe, and calcinate at 1000°C for 50 minutes;

[0031] d. The material calcined in step c is cooled to room temperature with the furnace, then taken out, pulverized and ground to obtain vanadium-titanium magnetite powder with a particle size of 0.01-0.05 mm.

[0032] The grade of all-iron product in the finally obtained vanadium-titanium magnetite powder is 87%.

Embodiment 2

[0034] a. Take the limestone and crush it into limestone powder with particle size less than or equal to 0.07mm with a pulverizer;

[0035] B, carry out batching according to following weight ratio, iron ore concentrate: limestone powder: coal dust=200:1.5:0.5, adjust slag alkalinity simultaneously to be 1.4;

[0036] c. After mixing the limestone powder and coal powder, spray them into the combustion zone of the blast furnace through the blast furnace side tuyere branch pipe, and calcinate at 900°C for 60 minutes;

[0037] d. The material calcined in step c is cooled to room temperature with the furnace, then taken out, pulverized and ground to obtain vanadium-titanium magnetite powder with a particle size of 0.01-0.05 mm.

[0038] The grade of all-iron product in the finally obtained vanadium-titanium magnetite powder is 86%.

Embodiment 3

[0040] a. Take the limestone and crush it into limestone powder with particle size less than or equal to 0.07mm with a pulverizer;

[0041] B, carry out batching according to following weight ratio, iron ore concentrate: limestone powder: coal dust=400:5:1, adjust slag alkalinity simultaneously to be 1.7;

[0042] c. After mixing limestone powder and coal powder, spray them into the combustion zone of the blast furnace with the branch pipe of the tuyere beside the blast furnace, and calcinate at 1100°C for 40 minutes;

[0043] d. The material calcined in step c is cooled to room temperature with the furnace, then taken out, pulverized and ground to obtain vanadium-titanium magnetite powder with a particle size of 0.01-0.05 mm.

[0044] The grade of all-iron product in the finally obtained vanadium-titanium magnetite powder is 88%.

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Abstract

The invention relates to a smelting method for iron ore, in particular to a blast furnace smelting method for vanadium-titanium magnetite. The blast furnace smelting method for the vanadium-titanium magnetite includes the steps that a, limestone is taken, smashed and ground so that limestone powder can be obtained; b, burdening is performed according to the following weight ratio, wherein the weight ratio of iron ore concentrate to the limestone powder to pulverized coal is equal to (200-400): (1.5-4): (0.5-1), and meanwhile the slag alkalinity is adjusted to 1.4-1.7; c, after the limestone powder and the pulverized coal are mixed, a mixed material is sprayed into a blast furnace combustion area through a blast furnace bypass air port branch pipe, and is calcined for 40-60 min under 900-1100 DEG C; and d, the material calcined in the step c is cooled to the room temperature through furnace cooling, and then is taken out, smashed and ground, and vanadium-titanium magnetite powder is obtained. According to the blast furnace smelting method for the vanadium-titanium magnetite, the pulverized coal and the limestone powder are utilized, by means of blast furnace calcining reduction, impurities in the vanadium-titanium magnetite are reduced, recycling of resources is promoted, and the grade of iron in the vanadium-titanium magnetite is improved.

Description

technical field [0001] The invention relates to an iron ore smelting method, in particular to a blast furnace smelting method of vanadium-titanium magnetite. Background technique [0002] Vanadium-titanium magnetite is a kind of complex refractory and refractory magnetite with coarse particle size, 53% iron grade, 12% titanium dioxide and 0.6% vanadium pentoxide. Spherical or weak spheroidal, my country's vanadium-titanium magnet beds are widely distributed and rich in reserves. The reserves and mining volume rank third in the country's iron ore. The proven reserves are 9.83 billion tons, and the prospective reserves are more than 30 billion tons. [0003] At present, vanadium-titanium magnetite concentrate is smelted through a single magnetic separation method. The grade of iron concentrate obtained after magnetic separation is always 60% to 61%, and the recovery rate is about 65%, so that the price of iron concentrate is not high. The economic benefit is not good. Therefo...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/02
CPCC21B5/00C22B1/02
Inventor 白朝春
Owner 攀枝花市徳铭再生资源开发有限公司
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