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Novel high-temperature steel slag modifier and modification pretreatment process

A modifier and steel slag technology, applied in the manufacture of converters and other directions, can solve the problems of poor pretreatment effect of steel slag modification, and achieve the reduction of steel slag basicity and free CaO content, reduction of CaO content, and high silicate content. Effect

Active Publication Date: 2019-07-26
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the technical problem of poor steel slag modification pretreatment effect in the existing technology, the present invention provides a new high-temperature steel slag modification pretreatment process, which improves the stability and grindability of steel slag and improves the recovery rate of steel slag

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  • Novel high-temperature steel slag modifier and modification pretreatment process
  • Novel high-temperature steel slag modifier and modification pretreatment process
  • Novel high-temperature steel slag modifier and modification pretreatment process

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Experimental program
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Effect test

Embodiment 1

[0048] The high-temperature steel slag modifier in this embodiment is composed of coal powder with an elemental carbon content of 83% and silicon powder with an elemental silicon content of 72%. The particle size of the coal powder is 0.5-1.5 mm, and the particle size of the silicon powder is 1-2 mm.

[0049] The amount of coal powder added is 0.2% of the weight of steel slag, the total amount of silicon powder added is 5% of the weight of steel slag, that is, the actual amount of elemental C added is 0.166% of the weight of slag, and the actual amount of elemental silicon added is 3.6% of the weight of slag.

[0050] like figure 1 As shown, the flatbed truck carrying the slag tank goes under the furnace mouth of the converter, and the converter 1 starts to discharge slag. At the same time, a hopper equipped with a modifier is installed next to the slag tank. The silicon-containing substance A and the elemental carbon-containing substance in the modifier B is stored in Modifie...

Embodiment 2

[0072] The steps of this embodiment are basically the same as those of Embodiment 1, the difference is that:

[0073] In this embodiment, the modifying agent is composed of activated carbon with 91% elemental carbon content and industrial silicon with 93% elemental silicon content. The particle size of activated carbon is 1-2 mm, and the particle size of industrial silicon is 1-2 mm;

[0074] The amount of activated carbon added is 0.27% of the weight of steel slag, the total amount of industrial silicon added is 5.4% of the weight of steel slag, that is, the actual amount of elemental C added is 0.25% of the weight of slag, and the actual amount of elemental silicon added is 5% of the weight of slag;

[0075] Step 3) The pressure of nitrogen blowing is 0.7MPa.

[0076] The pretreated steel slag is then magnetically recovered for elemental iron. After the steel slag is finely powdered, the test results according to the standard GB / T20491-2006 "Steel slag powder used in cement ...

Embodiment 3

[0081] The steps of this embodiment are basically the same as those of Embodiment 1, the difference is that:

[0082] In this embodiment, the modifying agent is composed of bituminous coal with an elemental carbon content of 85% and ferrosilicon with an elemental silicon content of 75%. The particle size of bituminous coal is 0.5-2.0 mm, and the particle size of ferrosilicon is 1-2 mm;

[0083] The amount of bituminous coal added is 0.35% of the weight of steel slag, the total amount of ferrosilicon added is 4% of the weight of steel slag, that is, the actual amount of elemental C added is 0.3% of the weight of slag, and the actual amount of elemental silicon added is 3% of the weight of slag;

[0084] Step 3) The pressure of nitrogen blowing is 0.5MPa.

[0085] The pretreated steel slag is then magnetically recovered for elemental iron. After the steel slag is finely powdered, the test results according to the standard GB / T20491-2006 "Steel slag powder used in cement and conc...

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Abstract

The invention discloses a novel high-temperature steel slag modifier and a modification pretreatment process, and belongs to the technical field of steel slag modification. The novel high-temperaturesteel slag modifier comprises a substance containing elemental silicon and a substance containing elemental carbon, the content of the elemental silicon in the substance containing the elemental silicon is more than or equal to 60%, and the content of the elemental carbon in the substance containing the elemental carbon is more than or equal to 80%. The invention further discloses the novel high-temperature steel slag modification pretreatment process which comprises the following steps 1) adding the substance containing the elemental carbon and the substance containing the elemental silicon into a slag tank in advance; 2) when a converter is deslagging, adding the substance containing the elemental silicon into the slag tank at the same time; 3) blowing nitrogen into a material after deslagging, and collecting generated dust at the same time; and 4) carrying out hot stuffy treatment on steel slag subjected to nitrogen blowing treatment in the step 3). The novel high-temperature steelslag modifier and the modification pretreatment process can effectively improve the stability and grindability of the steel slag and improve the recovery rate of the slag and steel.

Description

technical field [0001] The invention belongs to the technical field of steel slag modification, and more specifically relates to a novel high-temperature steel slag modifier and a modified pretreatment process. Background technique [0002] At present, my country has accumulatively stockpiled more than 1 billion tons of steel slag. Based on the annual output of 800 million tons of crude steel, the annual increase in steel slag is about 100 million tons. The current comprehensive utilization rate of steel slag resources is less than 30%. In addition to recycling iron-containing materials, And a small amount is used in cement, roads, etc. The steel tailings after magnetic separation exceeding 70% of the total amount of steel slag have not been effectively utilized. A large amount of piled steel slag occupies land, pollutes the soil at the same time, and increases the dust concentration in the atmosphere. The utilization of steel slag is a comprehensive utilization of resources,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
CPCC21C5/36
Inventor 饶磊李帮平邱艳生张耀辉桂满城马孟臣
Owner MAANSHAN IRON & STEEL CO LTD
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