Low-titanium calcium aluminate and its preparing method

A technology of low calcium aluminate titanate and its manufacturing method, which is applied in the field of low calcium aluminate titanate, can solve the problems of unsuitable smelting, inconvenient use, and low efficiency, and achieve the effects of simple and feasible production process, abundant sources, and low melting temperature

Inactive Publication Date: 2004-12-15
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the accompanying minerals such as iron and titanium in the bauxite ore, the titanium content in the calcium aluminate pre-fused synthetic material is often high, such as TiO 2 The content is greater than 0.5%, which makes this calcium aluminate pre-melted composition not suitable for use as an anti-TiO 2 Smelting of demanding special steel, low carbon steel and ultra-low carbon steel
Although in Japanese Patent Laid-Open No. 2000-345226, CaO, Al 2 o 3 , Fe 2 o 3 The mixed powder is blown into molten iron with oxygen as carrier gas for dephosphorization of molten iron, effectively avoiding TiO 2 It has an impact on special steel smelting, but this mixed powder is easy to lose with the gas during use, which is inconvenient to use and low in efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: Production with a cupola. Get 3000kg of calcite, 7000kg of industrial alumina by-products, and pulverize iron to less than 100mm respectively, mix well and set aside. After igniting the coke at the bottom of the cupola furnace, add the prepared raw materials in an appropriate amount. After the raw materials are melted, they are released from the water hole under the furnace, and the raw materials are gradually added as the products flow out. After the product is released from the furnace, it is water quenched, crushed, screened, tested and packaged.

example 2

[0022] Example 2: Production by electric arc furnace. Take 6,500kg of limestone, 2,000kg of alumina, and 1,500kg of feldspar, crush them to less than 100mm, mix them evenly, put them into the electric arc furnace, turn on the electricity and heat them, and feed them successively as the materials melt to keep the materials on a suitable horizontal line near the upper edge of the electric furnace. until all melted. Turn off the power, remove the furnace; or follow the melting of the material, while feeding, release the molten material until the material is added, and the electrode is raised. After the product is air-cooled, it is crushed, screened, tested and packaged.

example 3

[0023] Example 3: Production with pool kiln. Take 3000kg of calcite powder, 2000kg of alumina, 3000kg of feldspar, and 2000kg of fluorite, and grind them to less than 100mm respectively, and mix them for later use. Heat the kiln with gas to a suitable temperature and then feed the material. As the material continues to melt, the material is added successively. The melted product flows out of the water hole of the kiln. After the product is released from the furnace, it is quenched, crushed, screened, tested, and packaged become.

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PUM

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Abstract

The low-titanium calcium aluminate product is produced with industrial alumina and its side product, calcite or limestone, fluorite and feldspar as material, and through crushing, mixing, smelting, cooling, crushing and sieving. The product has TiO2 content less than 0.5%, and is used as desulfurizing agent for smelting steel and fluorite substitute for smelting, especially in smelting special steel, low carbon steel and ultralow carbon steel with strict TiO2 content requirement.

Description

technical field [0001] The invention relates to metallurgical synthetic slag, especially a kind of TiO 2 Low calcium aluminate titanate with a content of less than 0.5%, used as a desulfurizer in steelmaking and a substitute for fluorite in the smelting process. Background technique [0002] In the process of iron-making and steel-making, in recent years, more and more pre-melted composites of calcium aluminate are used as a substitute for fluorite as a fluxing material. At the same time, it is also used for desulfurization and dephosphorization after the furnace An important constituent material of synthetic slag. However, this calcium aluminate pre-melted compound is generally formed by melting bauxite or iron bauxite and calcium oxide, such as Chinese patent 02120744.5. Due to the accompanying minerals such as iron and titanium in the bauxite ore, the titanium content in the calcium aluminate pre-fused synthetic material is often high, such as TiO 2 The content is grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 张延大张梦显
Owner 大连环球矿产股份有限公司
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