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Method for high-temperature harmless treatment of stainless steel slag through molten blast furnace slag

A technology for harmless treatment of stainless steel slag, applied in the field of iron and steel metallurgy and environmental engineering, can solve the problems of low fixing efficiency, high cost, complex processing technology, etc., and achieve the effect of thorough detoxification, less equipment and low energy consumption

Active Publication Date: 2017-03-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods still have the disadvantages of low Cr fixation efficiency, complicated treatment process, and high cost.

Method used

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  • Method for high-temperature harmless treatment of stainless steel slag through molten blast furnace slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After the blast furnace slag is slaged normally, put the molten blast furnace slag into the slag tank, and keep the molten blast furnace slag in a molten state by electric heating; the main components of the blast furnace slag are CaO 25%, SiO 2 45%, Al 2 o 3 5%, MgO 15%;

[0025] Add the stainless steel slag produced by electric furnace or argon-oxygen mixed blowing furnace to the molten blast furnace slag, in which the stainless steel slag is added to the molten blast furnace slag in a molten state; the material is kept in a molten state by electric heating, and the stainless steel slag is mixed with high temperature by stirring The slag is mixed evenly to form a molten mixed slag; the quality of the stainless steel slag is 5% of the molten blast furnace slag; the main components of the stainless steel slag are CaO 35% by mass percentage, SiO 2 35%, Al 2 o 3 0%, MgO 13%, Fe 2 o 3 0%, Cr 2 o 3 14%;

[0026] The molten mixed slag was quenched in water to ...

Embodiment 2

[0028] After the blast furnace slag is normally slag discharged, the molten blast furnace slag is put into the slag pot, and the molten blast furnace slag is kept in a molten state by electric heating; the main components of the blast furnace slag are CaO 45%, SiO 2 20%, Al 2 o 3 25%, MgO 3%;

[0029] Add the stainless steel slag produced by the electric furnace or argon-oxygen mixed blowing furnace to the molten blast furnace slag, and the stainless steel slag is added to the molten blast furnace slag in a semi-molten state; the material is kept in a molten state by electric heating, and the stainless steel slag is mixed with the high-temperature furnace by stirring The slag is mixed evenly to form a molten mixed slag; the quality of the stainless steel slag is 50% of the molten blast furnace slag; the main components of the stainless steel slag are CaO 70% by mass percentage, SiO 2 15%, Al 2 o 3 11%, MgO 0%, Fe 2 o 3 2%, Cr 2 o 3 1%;

[0030] The molten mixed s...

Embodiment 3

[0032] After the blast furnace slag is slaged normally, put the molten blast furnace slag into the slag tank, and keep the molten blast furnace slag in a molten state by electric heating; the main components of the blast furnace slag are CaO 28%, SiO 2 25%, Al 2 o 3 35%, MgO 6%;

[0033] Add the stainless steel slag produced by electric furnace or argon-oxygen mixed blowing furnace into the molten blast furnace slag. The stainless steel slag is added into the molten blast furnace slag in the form of lumps with a particle size of less than 150mm; The stainless steel slag and the blast furnace slag are evenly mixed to form a molten mixed slag; the quality of the stainless steel slag is 10% of the molten blast furnace slag; the main components of the stainless steel slag are CaO 40% by mass percentage, SiO 2 20%, Al 2 o 3 15%, MgO 15%, Fe 2 o 3 3%, Cr 2 o 3 5%;

[0034] The molten mixed slag was quenched in water to obtain a glassy slag with a glassy structure, and...

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Abstract

The invention discloses a method for high-temperature harmless treatment of stainless steel slag through molten blast furnace slag. The method comprises the following steps that (1) after blast furnace slag is normally discharged, and the molten blast furnace slag is loaded into a slag ladle to be kept in the molten state through electrical heating; (2) the stainless steel slag is added into the molten blast furnace slag, the slag ladle is powered on for heating, and stirring is conducted; and (3) glassy state furnace slag is obtained through water quenching, and heavy metal Cr is fixed in the glassy state furnace slag. Through the method, mixed slag glass bodies are formed, Cr is stable in the glassy furnace slag, and the environment emission standard is met; and the energy consumption in the treatment process is low, required newly-built devices is little, and resources are further utilized.

Description

technical field [0001] The invention belongs to the fields of iron and steel metallurgy and environmental engineering, and in particular relates to a method for harmlessly treating stainless steel slag by using molten blast furnace slag at high temperature. Background technique [0002] Stainless steel slag is the main waste produced by the smelting of stainless steel in electric furnace (EAF) and argon oxygen mixed furnace (AOD). The production of 1 ton of stainless steel produces about 0.3 tons of stainless steel slag. In 2015, my country's stainless steel output was about 21.5 million tons, and a total of about 6.45 million tons of stainless steel slag was produced. Stainless steel slag contains about 0.5%-5% chromium (Cr), these Cr are mainly Cr 6+ or Cr 3+ Existing in the form of human body, water body, soil, etc. will bring research harm and pollution, and it must be treated harmlessly. At present, there are mainly methods to deal with stainless steel slag, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/00C04B5/06
CPCC04B5/00C04B5/06
Inventor 干磊董建宏
Owner JIANGXI UNIV OF SCI & TECH
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