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Method for treating converter steel slag by virtue of slag bath reduction

A converter steel slag and slag bath technology, which is applied in the field of metallurgical waste slag treatment, can solve the problems of poor kinetic conditions of reduction reaction, difficult separation of slag and gold, and difficult production, so as to overcome poor kinetic conditions, small environmental pollution, and low treatment cost. low cost effect

Inactive Publication Date: 2016-11-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that converter steel slag contains high value components such as TFe and Mn, people have been exploring the problem of economical and efficient recovery of valuable components in converter steel slag. The converter steel slag is processed to recover the iron resources in the slag. As the reduction reaction proceeds and the FeO content in the slag gradually decreases, the viscosity of the slag increases, and the so-called "back-drying" phenomenon occurs, and the kinetic conditions of the reduction reaction gradually become worse. It makes it difficult to fully carry out the reduction reaction; at the same time, due to the increase in the viscosity of the slag and the foaming of the slag caused by the gas such as CO produced by the reaction, it is difficult to separate the slag and gold; Deep reduction to prepare Fe-Si-Mn main alloy can maximize the recovery of valuable components in slag, but this treatment method has high processing temperature and difficult production
In short, there is no economical and feasible treatment method for efficient recovery of iron resources in converter slag; therefore, the development of economical and reasonable converter slag treatment methods is of great significance to promote the high value-added utilization of converter slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of converter steel slag contains 47.92% CaO, SiO 2 18.64%, FeO 17.83%, MgO 8.58%, Al 2 o 3 4.03%, P 2 o 5 1.00%, MnO 1.50%, TiO 2 0.50%;

[0026] The composition of aluminum ash contains Al 32.5% by weight percentage, Al 2 o 3 31.5%, SiO 2 28.3%, Na 2 O 2.5%, MgO 2.5%, CaO 1.8%, FeO 0.6%, MnO 0.3%;

[0027] The method is:

[0028] The converter steel slag is heated to 1350°C in the ladle furnace to form a molten slag pool, and then aluminum ash is added to the molten slag pool; the weight of aluminum ash accounts for 18.4% of the total weight of converter steel slag and aluminum ash;

[0029] Keep the molten slag pool at 1350°C for 0.5h, and at the same time, blow argon gas into the molten slag pool through the bottom of the ladle furnace or induction furnace to stir the molten slag pool. The pressure of argon gas is 0.3MPa, and the flow rate is 200L / min;

[0030] After the heat preservation is completed, the liquid alloy and tailings ar...

Embodiment 2

[0032] The composition of converter steel slag contains 36.80% CaO, SiO 2 28.50%, FeO 24.60%, MgO 7.12%, Al 2 o 3 2.18%, P 2 o 5 1.00%, MnO 1.50%;

[0033] The composition of aluminum ash contains Al 34.60% by weight percentage, Al 2 o 3 29.50%, SiO 2 28.3%, Na 2 O2.46%, MgO2.50%, CaO1.50%, FeO0.56%, MnO0.38%;

[0034] The method is:

[0035]The converter steel slag is heated to 1400°C in the ladle furnace to form a molten slag pool, and then aluminum ash is added to the molten slag pool; the weight of aluminum ash accounts for 24% of the total weight of converter steel slag and aluminum ash;

[0036] Keep the molten slag pool at 1400°C for 1 hour, and at the same time, blow argon gas into the molten slag pool through the bottom of the ladle furnace or induction furnace to stir the molten slag pool. The pressure of argon gas is 0.4MPa, and the flow rate is 250L / min;

[0037] After the heat preservation is completed, the liquid alloy and tailings are discharged s...

Embodiment 3

[0039] The composition of converter steel slag contains 41.76% CaO, SiO 2 16.53%, FeO 24.60%, MgO 6.84%, Al 2 o 3 2.67%, P 2 o 5 1.04%, MnO 1.16%;

[0040] The composition of aluminum ash contains Al 32.80% by weight percentage, Al 2 o 3 29.80%, SiO 2 29.22%, Na 2 O2.63%, MgO2.71%, CaO1.82%, FeO0.68%, MnO0.36%;

[0041] The method is:

[0042] The converter steel slag is heated to 1400°C in the ladle furnace to form a molten slag pool, and then aluminum ash is added to the molten slag pool; the weight of aluminum ash accounts for 24% of the total weight of converter steel slag and aluminum ash;

[0043] Keep the molten slag pool at 1400°C for 1 hour, and at the same time, blow argon gas into the molten slag pool through the bottom of the ladle furnace or induction furnace to stir the molten slag pool. The pressure of argon gas is 0.3MPa, and the flow rate is 300L / min;

[0044] After the heat preservation is completed, the liquid alloy and tailings are discharged...

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Abstract

A method for treating converter steel slag by virtue of slag bath reduction is carried out according to the following steps: (1), heating the converter steel slag to 1350-1450 DEG C so as to form a molten slag bath, and adding aluminum ash; (2), keeping the temperature of 1350-1450 DEG C for 0.5-1.0h, and at the same time, blowing into argon gas and stirring the molten slag bath; and (3), discharging liquid alloy and tailings, wherein the liquid alloy is industrial pure molten iron. The method can fully utilize the physical heat of molten slag, can realize the efficient utilization of solid wastes, can obtain industrial pure iron not containing carbon, is low in treatment cost, and causes little pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of metallurgical waste slag treatment, in particular to a method for reducing and treating converter steel slag in a slag bath. Background technique [0002] In the past 30 years, China's iron and steel industry has been greatly developed, especially since 2000, China's iron and steel industry has developed rapidly, steel production has continued to increase significantly, and metallurgical slag emissions have increased rapidly with the increase in crude steel production; the current development A variety of metallurgical slag utilization technologies have been proposed, but there are generally problems such as low added value of steel slag utilization, relatively high investment and operating costs, and the efficient recovery of high-temperature sensible heat resources has not been fully considered, resulting in valuable elements in metallurgical slag. Huge waste of waste heat resources. [0003] With the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C21B15/02
CPCC21B3/04C21B15/02Y02W30/50
Inventor 陈敏沈祥贺美乐王楠叶振川
Owner NORTHEASTERN UNIV