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Method for producing premelting-type calcium aluminate from calcium metal slag

A technology of calcium metal and calcium aluminate, applied in the field of metallurgy, can solve the problems of inconsistent with the development of the times, the reduction of bauxite reserves, and the consumption of large resources, etc., to achieve the effect of being beneficial to molten steel purification, stable desulfurization effect, and fast melting speed

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method that utilizes metallic calcium slag to produce calcium aluminate that the present embodiment provides, comprises the following steps:

[0023] 1) Crush and mix the raw materials: respectively mix metal aluminum slag, lime and bauxite in proportion, including 40% metal calcium slag, 30% lime, and 30% bauxite. Among them, the content of Cao in metal calcium slag is 50% ~55%, Al 2 o 3 36~45%, Cao in the lime>92%, Al in the bauxite 2 o 3 >85%;

[0024] 2) Put the mixed material into the smelting furnace for electric melting. When the mixed material is put into the smelting furnace, the method of feeding in small batches is adopted, and the voltage mentioned in the electric melting process is 160v;

[0025] 3) Discharge the molten liquid into the mold for cooling, and discharge it after regular quantitative melting;

[0026] 4) The cooled calcium aluminate finished product can be crushed, screened and packaged.

Embodiment 2

[0028] The method that utilizes metallic calcium slag to produce calcium aluminate that the present embodiment provides, comprises the following steps:

[0029] 1) Crush and mix the raw materials: respectively mix metal aluminum slag, lime and bauxite in proportion, including 75% metal calcium slag, 15% lime, and 10% bauxite. Among them, the content of Cao in metal calcium slag is 50% ~55%, Al 2 o 3 36~45%, Cao in the lime>92%, Al in the bauxite 2 o 3 >85%;

[0030] 2) Put the mixed material into the smelting furnace for electromelting. When the mixed material is put into the smelting furnace, the method of feeding in small batches is adopted, and the voltage mentioned in the electromelting process is 220v;

[0031] 3) Discharge the molten liquid into the mold for cooling, and discharge it after regular quantitative melting;

[0032] 4) The cooled calcium aluminate finished product can be crushed, screened and packaged.

Embodiment 3

[0034] The method that utilizes metallic calcium slag to produce calcium aluminate that the present embodiment provides, comprises the following steps:

[0035] 1) Crush and mix the raw materials: respectively mix metal aluminum slag, lime and bauxite in proportion, including 40% metal calcium slag, 40% lime, and 20% bauxite. Among them, the content of Cao in metal calcium slag is 50% ~55%, Al 2 o 3 36~45%, Cao in the lime>92%, Al in the bauxite 2 o 3 >85%;

[0036] 2) Put the mixed material into the smelting furnace for electromelting. When the mixed material is put into the smelting furnace, the method of feeding in small batches is adopted, and the voltage mentioned in the electromelting process is 200v;

[0037] 3) Discharge the molten liquid into the mold for cooling, and discharge it after regular quantitative melting;

[0038] 4) The cooled calcium aluminate finished product can be crushed, screened and packaged.

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Abstract

The invention discloses a method for producing premelting-type calcium aluminate from calcium metal slag. The method comprises the following steps of 1, raw material crushing and mixing: respectively mixing 40-75% of calcium metal slag, 10-30% of bauxite and 15-40% of lime, 2, electric smelting of the mixed materials in a smelting furnace, 3, cooling of the melt liquid flowing into a grinding tool, and 4, cooled calcium aluminate finished product fragmentation, screening and packaging. The method realizes production of the premelting-type calcium aluminate from recycled calcium metal slag (calcium metal leftovers) and limestone, prevents aluminum resource loss, greatly reduces a calcium aluminate production cost and reduces environmental pollution.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing premelted calcium aluminate by using metallic calcium 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 electrolytic alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04
Inventor 赵法焱
Owner ZHENGZHOU WHALE SPECIAL MATERIALS