A high-temperature steel slag modifier and modification pretreatment process

A technology of pretreatment and modifier, applied in the direction of manufacturing converters, etc., can solve the problems of poor pretreatment effect of steel slag modification, reduce the basicity and free CaO content of steel slag, improve gelling activity, and reduce silicate content. high effect

Active Publication Date: 2021-06-04
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 and pretreatment effect in the existing technology, the present invention provides a 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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  • A high-temperature steel slag modifier and modification pretreatment process
  • A high-temperature steel slag modifier and modification pretreatment process
  • A high-temperature steel slag modifier and modification pretreatment process

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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] Such as 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 Modi...

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 high-temperature steel slag modifier and a modification pretreatment process, belonging to the technical field of steel slag modification. It includes elemental silicon-containing substances and elemental carbon-containing substances, the elemental silicon content of the elemental silicon-containing substances is ≥ 60%; the elemental carbon content of the elemental carbon-containing substances is ≥ 80%. The invention also discloses a high-temperature steel slag modification pretreatment process, which includes the following steps: 1) pre-adding elemental carbon-containing substances and elemental silicon-containing substances into the slag tank; Adding elemental silicon-containing material; 3) After slag removal, nitrogen is blown into the material, and the generated dust is collected at the same time; 4) The steel slag after the nitrogen blowing treatment in step 3) is subjected to hot stuffing treatment. The invention can effectively improve the stability and grindability of steel slag and improve the recovery rate of steel slag.

Description

technical field [0001] The invention belongs to the technical field of steel slag modification, and more specifically relates to a 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, and i...

Claims

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Application Information

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Patent Type & Authority Patents(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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