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Chromium-contained high-calcium aluminum slag ball and preparation method thereof

A technology of aluminum slag balls and high calcium, applied in the direction of improving process efficiency, can solve the problems of low strength of aluminum slag balls, easily broken aluminum slag balls, large consumption, etc., to achieve enhanced impact resistance, increased oxidation resistance, The effect of reducing the breakage rate

Inactive Publication Date: 2018-06-01
天津基纳科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is that the molten steel comes out of the furnace without slag, and a carbonaceous thermal insulation agent with better thermal insulation performance is added to the surface of the molten steel to insulate and insulate the molten steel. However, the carbonaceous thermal insulation agent will increase the carbon content of the molten steel, which is extremely unfavorable for smelting low-carbon steel.
The third is to use fly ash and other carbon-free protective agents. Although this carbon-free protective agent avoids the carburization of molten steel, the main components of fly ash are alumina and silicon oxide. The phenomenon of molten steel returning to silicon is very unfavorable for smelting some steels whose silicon content is strictly controlled. On the other hand, a large amount of alumina needs to consume a large amount of calcium oxide, which is very unfavorable for reducing alumina inclusions in molten steel.
However, in the process of preparing aluminum slag balls, raw materials such as aluminum powder are only initially bonded by glass water, and most of the glass water volatilizes during high-temperature baking, and the prepared aluminum slag balls are only bonded by external pressure. The strength of the aluminum slag balls is small, and the aluminum slag balls are easily broken during the transportation of the aluminum slag balls, which not only causes a waste of materials, but at the same time, after the broken aluminum slag ball powder is added to molten steel, due to the fluidity of the powder Poor, the aluminum slag ball powder cannot quickly form a covering layer in the molten steel, resulting in the inability of the molten steel to be isolated from the external environment, and a large amount of oxygen enters the molten steel again, causing secondary oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Solution preparation: get 7kg of dicarbonyl (pentamethylcyclopentadienyl) chromium dimer, 0.7kg of hexacarbonyl chromium and add in 50kg of ethanol solution, the concentration of ethanol solution is 91%, raise the temperature of ethanol solution to 22 ℃, Stir until it is completely dissolved to obtain a mixed solution; premixing: take 33kg of calcium carbonate, 13kg of magnesium oxide, and 14.5kg of aluminum oxide and put them into the mixer for 17 minutes, then add 11.54kg of the prepared mixed solution to the mixture, and stir evenly Put the uniformly mixed material into the ball press machine and roll it to form premixed granules. The particle size of the premixed granules is 110mm. After drying, it is fired in an electric furnace. The temperature of the electric furnace is 180°C. The mixed particles are milled to make a premixed powder, and the particle size of the premixed powder is 110 μm;

[0036] The second mixing: take premixed powder, 56kg of metal aluminum, t...

Embodiment 2

[0038] Solution preparation: get 5kg of dicarbonyl (pentamethylcyclopentadienyl) chromium dimer, 0.5kg of hexacarbonyl chromium and add in 40kg of ethanol solution, the concentration of ethanol solution is 93%, raise the temperature of ethanol solution to 24 ℃, Stir until it is completely dissolved to obtain a mixed solution; premixing: take 30kg of calcium carbonate, 13kg of magnesium oxide, and 17kg of aluminum oxide and put them into the mixer for 15 minutes of mixing, then add 9.1kg of the prepared mixed solution to the mixture, and stir evenly. Put the evenly mixed material into the ball press machine and roll it to form premixed granules. The particle size of the premixed granules is 100mm. After drying, it is fired in an electric furnace. The temperature of the electric furnace is 170°C. Grinding the particles to make a premixed powder, the particle size of the premixed powder is 120 μm;

[0039] The second mixing: take premixed powder, 59kg of metal aluminum, the particl...

Embodiment 3

[0041] Solution preparation: get dicarbonyl (pentamethylcyclopentadienyl) chromium dimer 9kg, hexacarbonyl chromium 0.5kg and add in the ethanol solution 40kg, the concentration of ethanol solution is 93%, raise the temperature of ethanol solution to 20 ℃, Stir until it is completely dissolved to obtain a mixed solution; premixing: take 36kg of calcium carbonate, 16kg of magnesium oxide, and 17kg of aluminum oxide and put them into the mixer for 15 minutes of mixing, then add 13.98kg of the prepared mixed solution to the mixture, and stir evenly. Put the evenly mixed material into the ball press machine and roll it to form premixed granules. The particle size of the premixed granules is 100mm. After drying, it is fired in an electric furnace. The temperature of the electric furnace is 170°C. Grinding the particles to make a premixed powder, the particle size of the premixed powder is 120 μm;

[0042] The second mixing: take premixed powder, 53kg of metal aluminum, the particle...

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Abstract

The invention relates to a chromium-contained high-calcium aluminum slag ball and a preparation method thereof. The chromium-contained high-calcium aluminum slag ball comprises the following raw materials in parts by weight: 53-59 parts of metal aluminum, 12-17 parts of aluminum oxide, 30-36 parts of calcium carbonate, 10-16 parts of magnesium oxide, 40-60 parts of ethanol solution, 5-9 parts of dicarbonyl (pentamethyl cyclopentadienyl) chromium dimer, and 0.5-0.9 part of chromium carbonyl. As the strength of the prepared chromium-contained high-calcium aluminum slag ball is improved, in the process of transporting the chromium-contained high-calcium aluminum slag ball, the impact resistance of the chromium-contained high-calcium aluminum slag ball is improved, and the damage rate of the chromium-contained high-calcium aluminum slag ball is greatly reduced. Meanwhile, dicarbonyl (pentamethyl cyclopentadienyl) chromium dimer, chromium carbonyl and metal aluminum synchronously consume oxygen in primarily molten steel, so that oxygen in molten steel is prominently reduced. The chromium element is remained in steel by reduction; and the stability and the oxidation resistance of the steel can be improved through little metal chromium.

Description

technical field [0001] The invention relates to the technical field of pretreatment alloying of molten steel refining, and more specifically relates to a chromium-containing high-calcium aluminum slag ball and a preparation method thereof. Background technique [0002] With the development of the national economy and the improvement of steel quality requirements, the steel smelting technology has developed from the original one-step steelmaking to the two-step steelmaking, that is, two steps of primary smelting and refining. The temperature of molten steel and the content of main elements are controlled by primary smelting, followed by deoxidation, impurity removal and alloying treatment by refining to obtain the expected variety and quality of steel. [0003] In the process of steelmaking, the surface of the molten steel should be covered with an insulating agent before it enters the refining furnace to prevent the molten steel from cooling down and surface oxidation. Adso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/076C21C7/00
CPCC21C7/00C21C7/0006C21C7/06C21C7/076Y02P10/20
Inventor 齐龙飞齐龙威
Owner 天津基纳科技发展有限公司
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