Converter slag modifier and manufacture and using method thereof

A converter steel slag and modifier technology, applied in the field of steel slag modifier, can solve the problems of serious pollution, no improvement in performance, increased investment in equipment and flue gas treatment facilities, etc., and achieves wide sources, low cost, and stable treatment. Effect

Active Publication Date: 2012-10-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pollution of this method is relatively serious, and the investment in equipment and flue gas treatment facilities needs to be increased, and the performance of the slag is not improved.

Method used

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  • Converter slag modifier and manufacture and using method thereof
  • Converter slag modifier and manufacture and using method thereof
  • Converter slag modifier and manufacture and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The raw material of the converter steel slag modifier is the filtered mud cake and blast furnace gas ash after the wastewater treatment of metallurgical enterprises. The composition of the raw material is shown in Table 1 (the balance is impurities).

[0032] Table 1 Raw material composition of converter steel slag stability modifier

[0033]

[0034] Table 2 Batching scheme of converter steel slag stability modifier

[0035]

[0036] First dry the wet material in the raw material, the drying temperature is 107°C, then mix the prepared raw material with a mixer, pass the material through a 1mm sieve, the moisture content of the mixed material is 1.6%, and the finished product is used as a converter Slag modifier.

[0037] Before the slag is discharged from the converter, add it into the slag tank along with the slag flow according to 5% of the slag amount. The slag discharge temperature is 1640°C, the cooling rate of the slag tank is about 1°C per minute, and th...

Embodiment 2

[0039] The raw materials of the converter steel slag modifier are the filtered mud cake, blast furnace gas ash and drainage channel sludge after the wastewater treatment of metallurgical enterprises.

[0040] Table 3 Batching scheme of converter steel slag stability modifier

[0041]

[0042] Table 4 Batching scheme of converter steel slag stability modifier

[0043]

[0044]First dry the wet material in the raw material, the drying temperature is 180°C, then mix the prepared raw material with a mixer, pass the material through a 1mm sieve, the moisture content of the mixed material is 1.52%, and the finished product is used as a converter Slag modifier.

[0045] Before the slag is discharged from the converter, 15% of the slag amount is added to the slag tank at one time in advance. The slag discharge temperature is 1610°C, the cooling rate of the slag tank is about 1°C per minute, and the tank temperature is ≥1500°C for about 110 minutes, and then the fully modified ...

Embodiment 3

[0047] The raw materials of the converter steel slag modifier are filtered mud cake after wastewater treatment in metallurgical enterprises, blast furnace gas ash and drainage sludge. The raw material composition is shown in Table 5 (the balance is impurities).

[0048] Table 5 Batching scheme of converter steel slag stability modifier

[0049]

[0050] Table 6 Batching scheme of converter steel slag stability modifier

[0051]

[0052] First dry the wet material in the raw material at a drying temperature of 250°C, then mix the prepared raw material with a mixer, pass the material through a 1mm sieve, and the moisture content of the mixed material is 1.43%, and the finished product is used as a converter Slag modifier.

[0053] Before the slag is discharged from the converter, 25% of the amount of slag is added to the slag tank at one time in advance. The slag discharge temperature is 1600°C, the cooling rate of the slag tank is about 1°C per minute, and the tank temp...

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PUM

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Abstract

The invention provides a converter slag modifier using low-iron wastes as raw materials, a manufacture method and a using method thereof. The modifier is a mixture composed of one or several of the following materials: press-filtered sludge cakes through metallurgy waste water treatment, drainage ditch sludge, gas mud and gas ash, and main chemical compositions simultaneously meet the following conditions by weight percentage: 27% to 99.9% of SiO2, 0.01% to 25% of CaO and 0.01% to 50% of TFe. A carbon excess coefficient Kc is 1 to 8. The manufacture method of the converter slag modifier comprises drying, proportioning, mixing, and screening to obtain a finished product. The using method of the converter slag modifier comprises feeding, slagging, slag granulating, etc., thereby making a f-CaO of the converter slag less than or equal to 1.5%, and fulfilling a stable treatment of the converter slag.

Description

technical field [0001] The invention relates to the technical field of processing steel slag and low-iron waste in the metallurgical industry, in particular to a steel slag modifier for treating low-iron waste by utilizing molten converter steel slag and a use method thereof. Background technique [0002] Converter slag is used as waste slag during steelmaking, and generally accounts for about 20% of crude steel output. In recent years, with the rapid development of my country's iron and steel industry, the accumulation of steel slag has increased year by year, which not only occupies a large amount of land, but also causes serious environmental pollution. With the development of the national circular economy, it is required to realize the reuse of waste resources in the metallurgical industry, especially the reuse of metallurgical slag and waste gas has become the focus of circular economy in the metallurgical industry. The most critical factor for the comprehensive utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21C5/28
CPCY02W30/50
Inventor 王向锋于淑娟马光宇侯洪宇耿继双杨大正徐鹏飞
Owner ANGANG STEEL CO LTD
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