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Aluminum alloy melting covering agent

A covering agent and aluminum alloy technology, applied in the field of aluminum smelting, can solve the problems of reducing aluminum conductivity, poor boron deoxidation effect, magnesium inclusions, etc., achieve strong chemical stability and thermal stability, ensure composition and performance, and promote flotation flow effect

Inactive Publication Date: 2016-04-20
殷志杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for removing hydrogen during refining of aluminum and aluminum alloys include inert gas dehydrogenation, oxidation dehydrogenation and flux dehydrogenation, etc., but there are problems such as high cost and low efficiency of dehydrogenation equipment
Common deoxidation methods include phosphorus, lithium, boron, magnesium, etc., and the presence of phosphorus during deoxidation will strongly reduce the conductivity of aluminum. Lithium is expensive and easy to re-absorb hydrogen from the melt. Boron deoxidation effect is poor, and magnesium causes inclusions. Dehydrogenation and deoxidation refining technologies for the above-mentioned aluminum are difficult to meet the requirements of high-quality aluminum and aluminum alloy products

Method used

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  • Aluminum alloy melting covering agent

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Effect test

Embodiment 1

[0016] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 8 parts of boron carbide, 5 parts of silica sand, 12 parts of nano ceramics, 12 parts of aluminum oxide, 15 parts of chaff ash, modified 10 parts of perlite, 8 parts of wollastonite, and 9 parts of sodium fluorosilicate.

[0017] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0018] (1) soak the wollastonite and aluminum oxide of the above weight parts with 8% sulfuric acid for 8 hours, wash with deionized water, then soak with 12% sodium hydroxide solution for 5 hours, then wash with deionized water until neutral , and then calcined at 550°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0019] (2) Add boron carbide, silica sand, nano-ceramics, and sodium fluorosilicate in the above-mentioned parts by mass to soak in 1.2g / L potassium permanganate solution to remove i...

Embodiment 2

[0024] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 16 parts of boron carbide, 10 parts of silica sand, 25 parts of nano ceramics, 20 parts of aluminum oxide, 26 parts of chaff ash, modified 30 parts of perlite, 20 parts of wollastonite, and 8 parts of sodium fluorosilicate.

[0025] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0026] (1) soak the wollastonite and aluminum oxide of the above weight parts with 12% sulfuric acid for 5 hours, wash with deionized water, then soak with 10% sodium hydroxide solution for 8 hours, then wash with deionized water until neutral , and then calcined at 800°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0027] (2) Add boron carbide, silica sand, nano-ceramics, and sodium fluorosilicate in the above-mentioned parts by mass to soak in 1.2g / L potassium permanganate solution to remo...

Embodiment 3

[0032] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 12 parts of boron carbide, 8 parts of silica sand, 18 parts of nano ceramics, 16 parts of aluminum oxide, 20 parts of chaff ash, modified 20 parts of perlite, 14 parts of wollastonite, and 10 parts of sodium fluorosilicate.

[0033] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0034] (1) soak the wollastonite and aluminum oxide of the above weight parts with 10% sulfuric acid for 6 hours, wash with deionized water, then soak with 11% sodium hydroxide solution for 7 hours, then wash with deionized water until neutral , and then calcined at 700°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0035] (2) Add the boron carbide, silica sand, and nano-ceramics in the above mass fractions into 1.2g / L potassium permanganate solution for soaking to remove impurities, then fi...

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Abstract

The invention relates to an aluminum alloy melting covering agent which consists of the following components in parts by mass: 8-16 parts of boron carbide, 5-10 parts of silica sand, 12-25 parts of nano ceramics, 12-20 parts of aluminum oxide, 15-26 parts of rice husk ash, 10-30 parts of modified expanded perlite, 8-20 parts of wollastonite and 8-10 parts of sodium fluosilicate. The melting covering agent integrates multiple functions such as oxygen removal, gas removal and impurity removal and has relatively strong ability in adsorption, dissolution and combination slagging. The oxide inclusion in the molten aluminum alloy can be reduced while the hydrogen and oxygen and metal oxides adsorbed thereon are removed. Due to the high surface tension between the aluminum alloy melting covering agent and the melt, the slag can be driven to float upward so that the slag and the molten aluminum are separated well and the effects of refining and impurity removing and melt purifying are realized. The aluminum alloy melting covering agent has relatively strong chemical stability and thermal stability, avoids corrosive effect on the molten aluminum and furnace lining and guarantees original components and performance of the alloy.

Description

technical field [0001] The invention relates to an aluminum alloy smelting covering agent, which belongs to the technical field of aluminum smelting. Background technique [0002] Aluminum and aluminum alloys often contain impurity elements such as hydrogen, oxygen, sulfur, lead, bismuth, and arsenic in the smelting process. These impurity elements have a great influence on the thermal conductivity and processing performance of aluminum. For example, oxygen and sulfur are likely to cause "cold brittleness" of castings, lead and bismuth are likely to cause "hot brittleness" of materials, and hydrogen is the most common and most harmful gas in aluminum, which will cause a large number of pipes to foam and cause serious quality accidents. Adding an appropriate amount of smelting covering agent in the smelting process of aluminum and aluminum alloy can play the role of degassing, slag removal and grain refinement. [0003] At present, the methods for removing hydrogen during re...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00
CPCC22C1/06C22C1/026C22C21/00
Inventor 不公告发明人
Owner 殷志杰
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