Method for improving internal crystallization of aluminum products

A technology of internal crystallization and products, which is applied in the field of improving the internal crystallization of aluminum products, can solve the problems of great influence on production costs and expensive materials, and achieve the effects of convenient operation, unique process methods, and reduced RE content

A technology of internal crystallization and products, which is applied in the field of improving the internal crystallization of aluminum products, can solve the problems of great influence on production costs and expensive materials, and achieve the effects of convenient operation, unique process methods, and reduced RE content

CN102719684AInactive Publication Date: 2012-10-10QINGTONGXIA ALUMINUM GRP
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A method for improving the internal crystallization of aluminum products. The method is to use primary aluminum as a raw material, add RE elements into a mixing furnace, and after the furnace is full of materials, feed nitrogen into the prepared powder refining agent tank, and pass Put the powder refining agent into the molten aluminum under nitrogen pressure and continuously stir and refine. After refining, stir the molten aluminum evenly, remove the dross from the molten aluminum, and adjust the temperature of the mixing furnace in time to keep it within 700~760°C. Let the molten aluminum stand for 20 to 40 minutes.

[0021] The addition amount of the RE element is 0.03% of the raw material weight, and it is added into the mixing furnace in the form of an Al-RE master alloy.

[0022] The amount of nitrogen introduced is 30Nm 3 / h, the nitrogen pressure is 0.2-0.4MPa, and the time for feeding nitrogen is 20-30 minutes.

[0023] The powder refining agent...

Embodiment 2

[0026] Embodiment 2: A method for improving the internal crystallization of aluminum products. The method is to use primary aluminum as a raw material, add RE elements into a mixing furnace, and after the furnace is full of materials, feed nitrogen into the prepared powder refining agent tank, and pass Put the powder refining agent into the molten aluminum under nitrogen pressure and continuously stir and refine. After refining, stir the molten aluminum evenly, remove the dross from the molten aluminum, and adjust the temperature of the mixing furnace in time to keep it within 700~760°C. Let the molten aluminum stand for 20 to 40 minutes.

[0027] The addition amount of the RE element is 0.05% of the raw material weight, and it is added into the mixing furnace in the form of an Al-RE master alloy.

[0028] The amount of nitrogen introduced is 30Nm 3 / h, the nitrogen pressure is 0.2-0.4MPa, and the time for feeding nitrogen is 20-30 minutes.

[0029] The powder refining agent...

Embodiment 3

[0032] Embodiment 3: A method for improving the internal crystallization of aluminum products. The method is to use primary aluminum as a raw material, add RE elements into a mixing furnace, and after the furnace is full of materials, feed nitrogen into the prepared powder refining agent tank, and pass Put the powder refining agent into the molten aluminum under nitrogen pressure and continuously stir and refine. After refining, stir the molten aluminum evenly, remove the dross from the molten aluminum, and adjust the temperature of the mixing furnace in time to keep it within 700~760°C. Let the molten aluminum stand for 20 to 40 minutes.

[0033] The addition amount of the RE element is 0.09% of the raw material weight, and it is added into the mixing furnace in the form of an Al-RE master alloy.

[0034] The amount of nitrogen introduced is 30Nm 3 / h, the nitrogen pressure is 0.2-0.4MPa, and the time for feeding nitrogen is 20-30 minutes.

[0035] The powder refining agent...

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Abstract

The invention relates to a method for improving internal crystallization of products in nonferrous industries, in particular to a method for improving internal crystallization of aluminum products. The method includes that virgin aluminum serves as a raw material, an rear earth (RE) element is added into a holding furnace, after the holding furnace is full, nitrogen is fed into a prepared powder refining agent tank, the prepared powder refining agent is infiltrated into molten aluminum through nitrogen pressure to be stirred constantly, after fining, aluminum water is stirred evenly, molten aluminum scum is removed, the temperature of the holding furnace is adjusted timely to be kept in a range between 700 DEG C and 760 DEG C, and the molten aluminum is stood for 20 to 40 minutes. According to the method, the technique is unique, improvements of industrial pure aluminum strength and plasticity processed by the RE are larger than those processed by conventional fusing agents, the rate of finished products is improved, the RE value is saved, and the rare earth aluminum ingot loss value is saved.

Description

technical field [0001] The invention relates to a method for improving the internal crystallization of products in the non-ferrous industry, in particular to a method for improving the internal crystallization of aluminum products. Background technique [0002] Electrolytic primary aluminum is an important raw material for industrial production, Fe and Si are one of the main impurity elements, and its main forms are FeAl 3 , T1 is Al2Fe 3 Si, T2 is Al9Fe 2 Si 2 , free state Si, etc., they are dissolved in the Al matrix to form a Chinese character-shaped α solid body or form a long needle-shaped intermetallic compound with Al and precipitate from the aluminum liquid. The mechanical properties and physical and chemical properties of aluminum products have a great influence. At present, due to the internal crystallization requirements of the product, customers demand products with a better internal organizational structure under the same product price. Manufacturers need to...

Claims

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Application Information

Patent Timeline
10 Oct 2012
Publication
CN102719684A
IPC
C22B21/06
Inventors
田永锋; 郝少文