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Regeneration method for molten iron desulphurization slag

A technology of hot metal desulfurization slag and treatment method, which is applied in the field of metallurgy, can solve the problems of ignoring recycling, etc., and achieve the effects of short treatment time, avoiding hydration, and easy operation

Inactive Publication Date: 2014-08-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Existing technologies focus on how to effectively increase the recovery rate of iron in desulfurization slag, while ignoring the recovery and utilization of other valuable components or minerals in the slag, such as unreacted lime particles, CaO and SiO in slag 2 and Al 2 o 3 etc., so it is necessary to develop a more effective and thorough recycling method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The molten iron desulfurization slag is turned out from the special slag tank, spread evenly and cooled naturally, the desulfurization slag is crushed with a heavy hammer, and then ball milled on a vibrating ball mill, and the raw material obtained after ball milling is passed through a 150-mesh sieve, and the coarse-grained slag After iron removal, it is returned for secondary grinding. The fine-grained slag enters the dry magnetic separator for separation of slag and iron. The magnetic field strength is 100kA / m. Metal iron is returned to the sintering, ironmaking or steelmaking process. Add lime with 20% of the mass of magnetically separated tailings, mix and press with a dry ball press to make a regenerated desulfurizer. According to the above treatment parameters, the recovery rate of iron in the whole treatment process is 87.54%. The desulfurization test of molten iron on a 100kg induction furnace shows that: when the initial sulfur content of molten iron is 0.050%...

Embodiment 2

[0028] The molten iron desulfurization slag is turned out from the special slag tank, spread evenly and cooled naturally, the desulfurization slag is crushed with a heavy hammer, and then ball milled on a vibrating ball mill, and the raw material obtained after ball milling is passed through a 200-mesh screen, and the coarse-grained slag is After iron removal, it is returned for secondary grinding, and the fine slag enters the dry magnetic separator for separation of slag and iron. The magnetic field strength is 150kA / m. Then add 30% lime, mix it and press it with a dry ball press to make a regenerated desulfurizer. According to the above treatment parameters, the recovery rate of iron in the whole treatment process is 92.33%. The desulfurization test of molten iron on a 100kg induction furnace shows that: when the initial sulfur content of molten iron is 0.063%, adding a regeneration desulfurization dose of 10.0kg / t, the sulfur content of molten iron after treatment is reduce...

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Abstract

The invention discloses a regeneration method for molten iron desulphurization slag. The regeneration method comprises the following steps of naturally cooling molten iron desulphurization slag generated by a steel and iron plant, breaking the molten iron desulphurization slag by using a heavy hammer, and then, carrying out ball-milling treatment, wherein a hard calcium sulfide shell on the surfaces of lime particles is broken in the ball-milling process; after ball-milling treatment is ended, sieving by using a 100-250-mesh sieve, deironing oversize products, then, returning the oversize products to carry out secondary levigation, enabling fine screen underflow particles to enter a dry magnetic separator to carry out magnetic separation at the magnetic field strength of 100-150kA / m, returning and sintering the obtained an iron-contained substance or steelmaking and recycling; adding 10-30% of lime into magnetic separation tailings, pressing a spherical desulfurizer on a dry ball pressing machine after uniformly mixing, and returning to a metallurgy process for secondary desulphurization. The regeneration method is capable of recycling a great number of unreacted lime particles in the molten iron desulphurization slag, simple in operation, economic, practical and particularly suitable for treating molten iron desulphurization slag in which lime powder is sprayed and blown.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a regeneration treatment method for molten iron desulfurization slag. Background technique [0002] In order to obtain high-quality steel, the sulfur in the molten iron needs to be removed before it enters the steelmaking furnace for smelting, which is called molten iron pre-desulfurization. At present, the lime injection desulfurization process is mainly used, which consumes lime and produces molten iron desulfurization slag. The basic principle of desulfurization by spraying lime particles in molten iron is: the sulfur in the molten iron diffuses to the surface of the lime particles and undergoes a desulfurization reaction to generate calcium sulfide. reaction, resulting in a sharp decline in the reactivity of the lime; in order to improve the desulfurization effect of molten iron, the production has to increase the amount of desulfurizer or reduce the particle s...

Claims

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Application Information

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IPC IPC(8): C21B3/04
CPCY02P10/20Y02W30/50
Inventor 王德永王慧华洪澜苏丽娟
Owner SUZHOU UNIV
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