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Method for producing premelting-type calcium aluminate from electrolytic aluminum waste residue

A technology of electrolytic aluminum waste slag and calcium aluminate, which is applied in the field of metallurgy, can solve the problems of reduced bauxite reserves, inconformity with the development of the times, and large resource consumption, and is beneficial to the purification of molten steel, improving the quality of molten steel and the service life of ladles , fast desulfurization effect

Inactive Publication Date: 2014-08-06
ZHENGZHOU WHALE SPECIAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the metallurgical industry, calcium aluminate is the main material for purifying molten steel. Traditional calcium aluminate is prepared by chemical reaction with lime powder and bauxite as the main raw materials. This traditional production method mainly uses bauxite Soil consumes a lot of resources, and the cost is relatively high. With the continuous development of mineral resources, the reserves of bauxite are gradually decreasing, which restricts the development of the industry.
In the process of electrolytic aluminum, electrolytic aluminum waste slag (leftovers) is an inevitable by-product, and these by-products still contain a large amount of aluminum slag. If the aluminum waste ash is discarded, it is a great waste of resources, and This kind of electrolytic aluminum ash will also cause environmental pollution. It is obviously not in line with the development of the times in today's environment-friendly and green environment.

Method used

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Comparison scheme
Effect test

Embodiment 1

[0024] A method for producing pre-melted calcium aluminate by using electrolytic aluminum waste slag provided in this embodiment comprises the following steps:

[0025] 1) Purification of raw materials: Purify the electrolytic aluminum waste slag to remove some impurities, and the Al in the purified electrolytic aluminum waste slag 2 o 3 The content of AlF> 60%, the content of AlF> 15%;

[0026] 2) Mixing: Mix the purified electrolytic aluminum waste slag and lime, the mixing ratio is: 30% electrolytic aluminum waste slag, 70% limestone, and the content of Cao in the limestone is >92%;

[0027] 3) Smelting: Put the raw materials into the melting furnace for smelting, set the voltage to 160v, and set the current according to the amount of added materials;

[0028] 4) Exile the melted product and put it into the high temperature resistant molten pool for cooling;

[0029] 5) Crushing, screening and packing the cooled pre-melted calcium aluminate.

Embodiment 2

[0031] A method for producing pre-melted calcium aluminate by using electrolytic aluminum waste slag provided in this embodiment comprises the following steps:

[0032] 1) Purification of raw materials: Purify the electrolytic aluminum waste slag to remove some impurities, and the Al in the purified electrolytic aluminum waste slag 2 o 3 The content of AlF> 60%, the content of AlF> 15%;

[0033] 2) Mixing: Mix the purified electrolytic aluminum waste slag and lime, the mixing ratio is: 50% electrolytic aluminum waste slag, 50% limestone, and the content of Cao in the limestone is >92%;

[0034] 3) Smelting: Put the raw materials into the melting furnace for smelting, set the voltage to 220v, and set the current according to the amount of added materials;

[0035] 4) Exile the melted product and put it into the high temperature resistant molten pool for cooling;

[0036] 5) Crushing, screening and packing the cooled pre-melted calcium aluminate.

Embodiment 3

[0038] A method for producing pre-melted calcium aluminate by using electrolytic aluminum waste slag provided in this embodiment comprises the following steps:

[0039] 1) Purification of raw materials: Purify the electrolytic aluminum waste slag to remove some impurities, and the Al in the purified electrolytic aluminum waste slag 2 o 3 The content of AlF> 60%, the content of AlF> 15%;

[0040] 2) Mixing: Mix the purified electrolytic aluminum waste slag and lime, the mixing ratio is: 40% electrolytic aluminum waste slag, 60% limestone, and the content of Cao in the limestone is >92%;

[0041] 3) Smelting: Put the raw materials into the melting furnace for smelting, set the voltage to 200v, and set the current according to the amount of added materials;

[0042] 4) Exile the melted product and put it into the high temperature resistant molten pool for cooling;

[0043] 5) Crushing, screening and packing the cooled pre-melted calcium aluminate.

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Abstract

The invention discloses a method for producing premelting-type calcium aluminate from electrolytic aluminum waste residue. The method comprises the following steps of 1, purifying electrolytic aluminum waste residue, 2, mixing the purified electrolytic aluminum waste residue and lime, 3, putting the raw material into a melting furnace and carrying out melting, 4, discharging the melt product into a high temperature-resistant melting tank and carrying out cooling, and 5, crushing the cooled premelting-type calcium aluminate, carrying out screening and carrying out packaging. The method utilizes electrolytic aluminum waste residue and limestone to prepare the premelting-type calcium aluminate, realizes recycle of waste, is environmentally friendly, saves energy, prevents aluminum resource loss, reduces a calcium aluminate cost and reduces environmental pollution. The calcium aluminate produced by the method has the characteristics of less impurity and uniform and stable components, can be used for the refining process of LF, SKF and VHP and can greatly improve molten steel quality and a ladle service life.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing premelted calcium aluminate by using electrolytic aluminum waste slag. Background technique [0002] In the metallurgical industry, calcium aluminate is the main material for purifying molten steel. Traditional calcium aluminate is prepared by chemical reaction with lime powder and bauxite as the main raw materials. This traditional production method mainly uses bauxite Soil consumes a lot of resources, and the cost is relatively high. With the continuous development of mineral resources, the reserves of bauxite are gradually decreasing, which restricts the development of the industry. In the process of electrolytic aluminum, electrolytic aluminum waste slag (leftovers) is an inevitable by-product, and these by-products still contain a large amount of aluminum slag. If the aluminum waste ash is discarded, it is a great waste of resources, and This kind of electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C21C7/04C21C7/06C21C7/064C01F7/16
CPCY02P10/20Y02P20/10
Inventor 赵法焱
Owner ZHENGZHOU WHALE SPECIAL MATERIALS
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