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Method for reducing FeO content of final slag in modification of molten converter slag

A converter slag and molten state technology is applied in the field of molten converter slag modification and FeO content reduction in final slag, which can solve the problems of high basicity, low reaction activity, long reaction time, etc., so as to improve utilization efficiency and reduce FeO content. , the effect of improving performance

Active Publication Date: 2018-09-07
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The potential value of converter slag, a high-temperature-treated material, is far from being realized
The current research and practical application have proved that compared with blast furnace slag, RO phase, spinel phase, various iron-containing compounds, olivine phase, and metallic iron contained in converter slag are wear-resistant phases, which increase the processing efficiency of steel slag. cost, and the basicity of steel slag is high, there are more free calcium oxide and magnesium oxide in the slag, and the crystal grains of the gelling substance in the middle of the steel slag are dense, the reactivity is low, and the reaction time is long, which affects the stability of converter slag products , limiting the scope of use of converter slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] After the converter completes smelting, the molten converter slag is directly put into the thermal insulation slag tank, and the temperature of the molten converter slag is 1510℃, and the range of the binary basicity R2 of the slag is 2.6; The range is 1355℃, using blast furnace dust and iron tailings as raw materials, using secondary batching, primary batching slag to control basicity R 4 =(CaO+MgO) / (SiO 2 +Al 2 O 3 )=1.4, in which the mass fraction of converter slag is 70%, the mass fraction of blast furnace dust is 15%, and the mass fraction of iron tailings is 15%; secondary batching slag control basicity R4=(CaO+MgO) / (SiO 2 +Al 2 O 3 ) = 0.8, where the mass fraction of slag is 50%, the mass fraction of blast furnace dust is 15%, and the mass fraction of iron tailings is 35%. The high-temperature flue gas of the electric arc furnace is used for preheating, and the preheating temperature range is 350 °C. Three feeding hoppers are evenly distributed on the upper ...

Embodiment 2

[0020]After the converter completes smelting, the molten converter slag is directly put into the thermal insulation slag tank, and the temperature of the molten converter slag is 1523℃, and the range of the slag binary basicity R2 is 4.0; the smelting temperature control The range is 1400 °C, using blast furnace dust and iron tailings as raw materials, using secondary batching and primary batching slag to control basicity R4=(CaO+MgO) / (SiO 2 +Al 2 O 3 )=1.8, in which the mass fraction of converter slag is 90%, the mass fraction of blast furnace dust is 7%, and the mass fraction of iron tailings is 3%; secondary batching slag control basicity R4=(CaO+MgO) / (SiO 2 +Al 2 O 3 ) = 1.3, where the mass fraction of slag is 70%, the mass fraction of blast furnace dust removal ash is 15%, and the mass fraction of iron tailings is 15%. The high temperature flue gas of the electric arc furnace is used for preheating, and the preheating temperature range is 450 °C. Three feeding hoppers...

Embodiment 3

[0022] After the converter completes smelting, the molten converter slag is directly put into the thermal insulation slag tank, and hot charged into the high temperature electric arc furnace through the thermal insulation slag tank. The temperature of the molten converter slag is 1545°C, and the slag binary basicity R2 range is 3.0; smelting temperature control The range is 1450℃, using blast furnace dust and iron tailings as raw materials, using secondary batching and primary batching slag to control basicity R4=(CaO+MgO) / (SiO 2 +Al 2 O 3 )=1.7, in which the mass fraction of converter slag is 85%, the mass fraction of blast furnace dust is 9%, and the mass fraction of iron tailings is 6%; secondary batching slag control basicity R4=(CaO+MgO) / (SiO 2 +Al 2 O 3 ) = 1.0, in which the mass fraction of slag is 60%, the mass fraction of blast furnace dust is 14%, and the mass fraction of iron tailings is 26%. The high-temperature flue gas of the electric arc furnace is used for p...

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Abstract

The invention discloses a method for reducing the FeO content of final slag in modification of molten converter slag. The composition of silicon dioxide in iron tailings is used for reducing the basicity of slag, and blast furnace dusting ash carbon is used for reducing iron oxide in molten slag; and according to the foam slag theory, by adopting the method of grading proportion, grading raw material mixing preheating and grading upper feeding, the use efficiency of blast furnace dusting ash is improved, the FeO content of the final slag in the modification of the molten converter slag is reduced, finally, the use performance of the final slag can be improved, the recovery of iron is improved and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment of steel slag, and in particular relates to a method for reducing the FeO content of final slag in the upgrading of molten converter slag. Background technique [0002] Converter slag is an industrial solid waste produced in the process of converter steelmaking. For every 1 ton of steel produced, 0.1 to 0.13 tons of steel slag is by-produced, and the temperature is about 1350 ℃ to 1450 ℃. It also contains 10-30% total iron (TFe) and a large amount of beneficial elements such as calcium, magnesium and silicon. At present, most iron and steel enterprises generally use simple magnetic separation. Except for a small part of the remaining tailings sold to cement plants, most of them are dumped, causing environmental pollution, land occupation and resource waste. [0003] The pretreatment methods in the steel slag pretreatment part include: hot splashing method, hot stuffing method, dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCC21B3/06Y02W30/50
Inventor 唐复平李金莲廖相巍王亮任伟韩子文童晓宇张伟张立国刘祥
Owner ANGANG STEEL CO LTD
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