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Coal powder additive for smelting of vanadium titano-magnetite and application of coal powder additive

A technology of vanadium-titanium magnetite and additives, applied in the field of metallurgical materials, can solve the problems of limited improvement effect, achieve the effects of reducing the coke ratio, improving the separation effect of slag and iron, and reducing the iron loss of blast furnace

Inactive Publication Date: 2017-05-31
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent only uses calcium fluoride to improve the performance of slag, and its improvement effect is limited

Method used

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  • Coal powder additive for smelting of vanadium titano-magnetite and application of coal powder additive

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preparation example Construction

[0027] The preparation method of the above-mentioned pulverized coal additive for smelting vanadium-titanium magnetite comprises the following steps:

[0028] a. Take fluorspar, crush it, and grind it until the particle size of less than 0.074 accounts for more than 30%, so as to obtain fluorspar powder;

[0029] b. Mix the ground fluorite powder and dedusting ash according to 30-70wt% fluorite powder and 30-70wt% dedusting ash; wherein, the sum of the weight percentages of fluorite powder and dedusting ash is 100%.

[0030] The invention also provides an application method of the pulverized coal additive in the smelting of vanadium-titanium magnetite.

[0031] The application of the above-mentioned pulverized coal additive in the smelting of vanadium-titanium magnetite is specifically: according to the following weight ratio, the pulverized coal additive: pulverized coal=1.5~7.5:150 is mixed and injected; the amount of the pulverized coal additive should not be too much , be...

Embodiment 1

[0037] TiO in blast furnace slag of vanadium-titanium magnetite smelted by Panzhihua Iron and Steel Group Co., Ltd. 2 The content reaches 20-24%. Therefore, the smelting of vanadium-titanium magnetite is improved by injecting mixed additives of fluorite and dedusting ash into the furnace hearth through the tuyere branch pipe, and the different additions are studied.

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Abstract

The invention belongs to the technical field of metallurgical materials and particularly relates to a coal powder additive for smelting of vanadium titano-magnetite and application of the coal powder additive. The coal powder additive for smelting of the vanadium titano-magnetite is composed of 30-70 wt% of fluorite powder and 30-70 wt% of dedusting ash, wherein the sum of the weight percent of the fluorite powder and the weight percent of the dedusting ash is 100%; the content of CaF2 in the fluorite powder is greater than or equal to 80%; the content of Fe2O3 in the dedusting ash is greater than or equal to 80%; and the content of TFe in the dedusting ash is greater than or equal to 65%. The beneficial element iron in the dedusting ash is recovered, and recycling and reusing of secondary resources are promoted; oxygen potential of the high-iron dedusting ash in a blast furnace is improved, the coke ratio is lowered, slag system compositions of vanadium titano-magnetite furnace slag is improved by the fluorite powder, forming of Ti (C and N) is suppressed, the slag-iron separation effect is improved, and iron losses of the blast furnace are reduced; and the environment protection problem caused by dedusting ash processing through conventional methods is solved, and the environmental protection benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a pulverized coal injection additive in the smelting of vanadium-titanium magnetite and its application. Background technique [0002] In the smelting process of vanadium-titanium magnetite, the performance of slag directly affects whether the smelting of the blast furnace is smooth or not. The difficulty in smelting vanadium-titanium magnetite is that after the slag thickens, the viscosity of the slag often increases, and the slag and iron are not separated, which seriously affects the blast furnace smelting, causes blast furnace abnormality, and affects the normal smelting of the blast furnace. In the past, in order to improve the performance of the slag in the furnace, manganese-containing ores were added from the top of the furnace, which improved the performance of the slag in the furnace to varying degrees, and the iron tapping was smoother. How...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/003
Inventor 胡鹏付卫国唐文博
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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