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Method for preparing steelmaking flux from refining waste slag under thermal state

A technology for refining waste slag and refining slag, which is applied in the direction of manufacturing converters, improving process efficiency, recycling technology, etc., can solve the problems of large amount of refining slag and high CaO content, and achieves reduction of processing costs, energy saving, and difficulty in pulverization. Effect

Inactive Publication Date: 2014-09-17
中钢集团武汉安全环保研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some high alkalinity refining slags have high CaO content and a certain amount of CaF 2 , used in the synthesis of converter slag can replace part of lime and fluorite, and the amount of refining slag is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: A high-Al and low-Si type hot refining waste slag was transferred from the LF furnace ladle to the melting furnace for hot desulfurization by hoisting. The composition of the waste slag is shown in Table 1.

[0023] Table 1 The content of each component of the refining waste slag in Example 1 Unit: %

[0024] Fe 2 o 3 CaO SiO 2 MgO Al 2 o 3 SO 3 BaO SrO ZrO 2 2.94 37.37 6.58 3.37 46.09 1.16 0.025 0.035 0.014

[0025] Under the condition of 1400°C, oxygen was introduced, the oxygen partial pressure was 2atm, and the reaction time was 40mim. After the desulfurization reaction is completed, the SO in the slag 3 Content decreased from 1.16 to 0.04. Then continue to mix CaO and CaF into the slag under the condition of 1400°C2 , the dosage is based on the preparation of 1000 kg pre-melted refining slag, refining waste slag: 760 kg, CaO: 210kg, CaF 2 : 30 kg, after reacting for 60 minutes, cool the slag and break...

Embodiment 2

[0026] Example 2: A high-Al and low-Si hot refining waste slag was transferred from the LF furnace ladle to the melting furnace for hot desulfurization by hoisting. The composition of the waste slag is shown in Table 2.

[0027] Table 2 Contents of each component of refining waste residue in Example 2 Unit: %

[0028] Fe 2 o 3 CaO SiO 2 MgO al 2 o 3 SO 3 BaO SrO ZrO 2 3.53 52.86 5.71 4.88 23.36 2.18 0.09 0.05 0.02

[0029] Under the condition of 1300°C, oxygen was introduced, the oxygen partial pressure was 2atm, and the reaction time was 60mim. After the desulfurization reaction is completed, the SO in the slag 3 Content decreased from 2.18 to 0.02. Then continue to mix CaO and CaF into the slag under the condition of 1300°C 2 , the dosage is based on the preparation of 1000 kg pre-melted refining slag agent, refining waste slag: 800 kg, CaO: 50 kg, Al 2 o 3 : 130 kg, CaF 2 : 20 kg, after reacting for 60 minutes, cool th...

Embodiment 3

[0031] Example 3: Transfer a high-Al refining slag waste from the ladle of the LF furnace to the melting furnace by hoisting for thermal desulfurization reaction. The composition of the waste slag is shown in Table 3.

[0032] Table 3 Contents of each component of refining waste residue in Example 3 Unit: %

[0033] Fe 2 o 3 CaO SiO 2 MgO al 2 o 3 SO 3 BaO SrO ZrO 2 1.74 52.86 12.10 4.48 23.54 2.11 0.025 0.035 0.014

[0034] Under the condition of 1400°C, oxygen was introduced, the oxygen partial pressure was 2atm, and the reaction time was 50mim. After the desulfurization reaction is completed, the SO in the slag 3 Content decreased from 2.11 to 0.05. Then continue to mix Fe into the slag under the condition of 1400°C 2 o 3 . The dosage is based on the preparation of 1000 kg converter slagging flux, refining waste slag: 950 kg, Fe 2 o 3 : 50 kg, after reacting for 40 minutes, cool the slag and break it to 3-8mm to ge...

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Abstract

The invention relates to a method for preparing a steelmaking flux from refining waste slag under a thermal state. The method comprises the following step: a, desulfurizing refining waste slag: introducing oxygen into a melting furnace, controlling the temperature of the melting furnace to be 1300-1500 DEG C, wherein the partial pressure of introduced oxygen is 1-2atm and the reaction time is 30 minutes-60 minutes, removing sulfur in the refining waste slag in a gaseous manner; b, preparing the steelmaking flux: preparing a premelting refining slag agent from high-Al low-Si type refining waste slag; preparing a premelting converter slag-forming flux from high-Al refining waste slag, or preparing a premelting converter slag-former from high-alkalinity low-Al refining waste slag. According to the invention, the full advantage of the sensible heat of the molten refining slag is taken, the treatment process of the refining waste slag is shortened, the energy conservation is achieved, sulfur in the refining waste slag is removed in a SO2 gaseous manner and the desulfurization efficiency reaches 97%, the steelmaking flux obtained by the invention is not easily chalked, the briquetting is not needed and the steelmaking flux can be directly used after the steelmaking flux is crushed.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of refining waste slag resources, and in particular relates to a method for preparing steelmaking flux in a hot state from refining waste slag produced in the steelmaking refining process. Background technique [0002] With the progress of smelting technology and technology, LF furnace refining process is widely used in metallurgical production. At present, every ton of steel refined in China produces about 10 kg of refining slag. At present, most iron and steel enterprises mix the LF furnace refining waste slag with the converter steel slag after cooling treatment, and dump it on the slag mountain, which brings serious problems of land occupation and environmental pollution. [0003] LF furnace refining waste slag contains a large amount of components such as calcium oxide, alumina, calcium fluoride, etc. These components are similar to some raw material components used in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C21C7/076C21C5/36
CPCY02P10/20Y02W30/50
Inventor 徐国平程慧高黄毅汪俊时万迎峰杨如仙聂聪谷庆红
Owner 中钢集团武汉安全环保研究院有限公司
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