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Comprehensive utilization method of iron, heat and slag of converter slag and desulfurization slag

A technology for desulfurization slag and converter slag, applied in the field of steelmaking, can solve the problems of high recovery rate of slag metal iron and high added value of tailings

Active Publication Date: 2021-10-01
吉立鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to provide a comprehensive utilization method of iron, heat and slag of converter slag and desulfurization slag, solve the iron, heat and slag comprehensive utilization of converter steel slag and desulfurization slag in steel mills, and the recovery rate of slag metal iron is high ( 50% higher than the slag slag process), the added value of tailing slag is high, and the water slag produced can be mixed into cement after deep processing and fine grinding; make full use of the latent heat of converter slag and desulfurization slag

Method used

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  • Comprehensive utilization method of iron, heat and slag of converter slag and desulfurization slag

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Embodiment 1

[0119] 1. After the end of converter smelting, pour the high-temperature hot steel slag into the slag tank, and then tap the steel. After tapping, carry out the operation of slag splashing to protect the furnace. After the slag splashing, no slag dumping operation is performed;

[0120] 2. Pour high-temperature hot converter slag into a special slag ladle (built with magnesia-carbon bricks), and then pour hot desulfurization slag into the slag ladle, (basically three furnaces of liquid converter slag and three furnaces of molten iron desulfurization slag , the converter slag is first poured into the slag bag, and then the desulfurization slag is poured into the slag bag), and then the slag bag is hoisted under the electric furnace with a rotatable cover (similar to the electric furnace of the LF furnace) for reduction smelting, and at the same time, 10% of the Carbonaceous reducing agent (coke powder, anthracite, etc.) and 20% silica (or silica, iron-containing tailings, etc.),...

Embodiment 2

[0141] In this embodiment, the liquid converter slag, the hot desulfurization slag, the carbonaceous reducing agent and the silicon-containing raw material are subjected to reduction smelting to obtain reduced molten iron and reduced slag with a Tfe content of ≤4% and an alkalinity of 1; wherein , in the reduction smelting, the initial temperature is 1100°C, and the temperature is raised to the end temperature of 1520°C at a rate of 4°C / min; the total mass of the liquid converter slag and the hot desulfurization slag, the carbonaceous reducing agent The ratio of the mass of the silicon-containing raw material to the mass of the silicon-containing raw material is 100:13:23; other steps are the same as in Example 1.

Embodiment 3

[0143] In this embodiment, the liquid converter slag, the hot desulfurization slag, the carbonaceous reducing agent and the silicon-containing raw material are subjected to reduction smelting to obtain reduced molten iron and reduced slag with Tfe content ≤ 4% and an alkalinity of 1.4; wherein , in the reduction smelting, the initial temperature is 1200°C, and the temperature is raised to the end temperature of 1540°C at a rate of 5°C / min; the total mass of the liquid converter slag and the hot desulfurization slag, the carbonaceous reducing agent The ratio of the mass of the silicon-containing raw material to the mass of the silicon-containing raw material is 100:7:17; other steps are the same as in Example 1.

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Abstract

The invention discloses a comprehensive utilization method of iron, heat and slag of converter slag and desulfurization slag. The comprehensive utilization method comprises the steps of reducing and smelting the liquid converter slag, the hot desulfurization slag, a carbonaceous reducing agent and silicon-containing raw materials to obtain reduced molten iron and reduced slag with a Tfe content of less than or equal to 4% and alkalinity of 1.2+ / -0.2, increasing an initial temperature of greater than or equal to 1000 DEG C to a final temperature of 1530+ / -10 DEG C at a rate of 4-5 DEG C / min during reduction and smelting, enabling a ratio of the total mass of the liquid converter slag and the hot desulfurization slag to the mass of the carbonaceous reducing agent to the mass of the silicon-containing raw materials to be 100:(7-13):(17-23), recovering the generated heat and coal gas to obtain qualified coal gas, performing water quenching on the reduced slag to form water granulated slag, performing dephosphorization converter smelting after performing dephosphorization on the reduced molten iron to obtain dephosphorized molten steel and dephosphorized slag, and performing slag hot disintegration, magnetic separation, crushing and screening on the dephosphorized slag to obtain dephosphorized tailings and slag steel. The method solves the problem of comprehensive utilization of the iron, heat and slag of the converter steel slag and the desulfurization slag.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a comprehensive utilization method of iron, heat and slag of converter slag and desulfurization slag. Background technique [0002] With the implementation of the "Environmental Protection Tax Law" from January 1, 2018, environmental protection tax (25 yuan / t) will be levied on metallurgical slag. Metallurgical slag mainly includes blast furnace slag and converter slag (steel slag): finely ground blast furnace slag has good gelling properties, and can be mixed into cement in a large proportion (~40%), basically realizing resource utilization; but converter slag , Desulfurization slag has relatively complex characteristics, and the utilization rate of high value-added resources has been low. Converter slag is a by-product of dephosphorization in steelmaking. Basically, it is separated from metallic iron and slag by drawing water to cool down (~1300°C heat is wasted), crushing...

Claims

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Application Information

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IPC IPC(8): C21B11/10C21C1/02C21B3/06C21C5/36
CPCC21B11/10C21C1/02C21B3/06C21C1/025C21C5/36C21B2100/44C21B2100/66C21C2005/363Y02W30/50Y02P10/20
Inventor 吉立鹏朱晓梅
Owner 吉立鹏
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