Refining agent for production of aluminum alloy sacrificial anodes, and preparation method thereof

A sacrificial anode and aluminum alloy technology, which is applied in the field of refining agent for preparing aluminum alloy sacrificial anode and its preparation, can solve the problems of uneven surface dissolution, long smelting time, harm to human body and environment, etc. The effect of improving the degassing effect and improving the refining ability

Inactive Publication Date: 2015-10-21
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the metal ingot is heated from room temperature to 780°C, the smelting time is long, the energy consumption is high, and the oxidation and burning loss of the metal is serious, and the general oxidation burning loss rate is as high as 10%.
The smelting of the sacrificial anode lacks a refining process, and there are a large number of air bubbles and metal oxide inclusions in the alloy, resulting in a positive shift in the potential of the aluminum alloy sacrificial anode, uneven surface dissolution, and a decrease in current efficiency
[0003] Almost all commercially available refining agents contain Na 2 SiF 6 , C powder, C 2 Cl 6 、C 6 Cl 6 One or more of them, among which Si, C and other elements seriously affec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A is NaCl, B is KCl, C is CaF 2 , D is Na 3 AlF 6 (sodium hexafluoroaluminate, trade name cryolite)

[0017] ①The weight percent of the refining agent formula: A is 36%, B is 51%, C is 6%, and D is 7%.

[0018] ② After the weighed raw materials are dried and dehydrated, mechanically stir and mix evenly, and heat to 800±50°C to make a melt. After the melt is condensed, it is crushed and sieved to obtain a particle size of 0.05 to 0.5mm. Powder.

[0019] ③ When the temperature of the aluminum alloy is 710-780°C, spray the powder refining agent and argon into the aluminum alloy melt through the jet refining device for refining, remove it after refining, and remove the surface scum.

[0020] 4. The use comparison of the refining agent of the present invention, the domestic refining agent and the imported refining agent:

[0021] Add the refining agent of the present invention, the domestic refining agent (RI41) and the foreign imported refining agent (HCR) into the mel...

Embodiment 2

[0023] A is NaCl, B is KCl, C is CaF 2 , D is Na 3 AlF 6

[0024] 1. The percentage by weight of the refining agent formula: A is 41%, B is 50%, C is 4% C, and D is 5% D.

[0025] ② After the weighed raw materials are dried and dehydrated, mechanically stir and mix evenly, and heat to 800±50°C to make a melt. After the melt is condensed, it is crushed and sieved to obtain a particle size of 0.05 to 0.5mm. Powder.

[0026] ③ When the temperature of the aluminum alloy is 710-780°C, spray the powder refining agent and argon into the aluminum alloy melt through the jet refining device for refining, remove it after refining, and remove the surface scum.

[0027] 4. the use contrast of refining agent of the present invention, domestic refining agent and foreign imported refining agent:

[0028] Add the refining agent of the present invention, domestic refining agent (RI41) and foreign imported refining agent (HCR) into the melted aluminum-zinc alloy according to the ratio of 3g...

Embodiment 3

[0030] A is NaCl, B is KCl, C is CaF 2 , D is Na 3 AlF 6

[0031] 1. The percentage by weight of the refining agent formula: A is 43%, B is 47%, C is 6%, and D is 4%.

[0032] ② After the weighed raw materials are dried and dehydrated, mechanically stir and mix evenly, and heat to 800±50°C to make a melt. After the melt is condensed, it is crushed and sieved to obtain a particle size of 0.05 to 0.5mm. Powder.

[0033] ③ When the temperature of the aluminum alloy is 710-780°C, spray the powder refining agent and argon into the aluminum alloy melt through the jet refining device for refining, remove it after refining, and remove the surface scum.

[0034] 4. the use contrast of refining agent of the present invention, domestic refining agent and foreign imported refining agent:

[0035] The refining agent of the present invention, the domestic refining agent (RI41) and the foreign imported refining agent (HCR) are respectively added in the molten aluminum alloy liquid conta...

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Abstract

The invention provides a refining agent for production of aluminum alloy sacrificial anodes, and a preparation method thereof. The refining agent for production of aluminum alloy sacrificial anodes comprises 30-40wt% of sodium chloride, 45-55wt% of potassium chloride, 3-5wt% of calcium fluoride, and the balance of sodium hexafluoroaluminate. The preparation method comprises the following steps: 1, carrying out drying dehydration on sodium chloride, potassium chloride, calcium fluoride and sodium hexafluoroaluminate, and weighing the above raw materials according to above weight percentages; and 2, mechanically stirring the weighed raw materials for uniform mixing, heating to 750-850DEG to prepare a melt, condensing the melt, crushing the condensed melt, and screening to obtain powder which is the finished refining agent. The refining agent has the advantages of simple and reasonable design of components, good slag removal effect, degassing and covering effects, low use temperature and ideal effect.

Description

technical field [0001] The invention relates to a refining agent for preparing an aluminum alloy sacrificial anode and a preparation method thereof. Background technique [0002] At present, the smelting process of aluminum alloy sacrificial anodes at home and abroad uses primary aluminum ingots with a purity of 99.85% and zinc ingots with a purity of 99.99% as raw materials. —Stationation—slag removal—alloying—stationary—casting and other processes to produce aluminum alloy sacrificial anodes. Furnaces are usually heated by electricity or gas. Since the metal ingot is heated from room temperature to 780°C, the smelting time is long, the energy consumption is high, and the oxidation and burning loss of the metal is serious. Generally, the oxidation burning loss rate is as high as 10%. The smelting of the sacrificial anode lacks a refining process, and there are a large number of air bubbles and metal oxide inclusions in the alloy, resulting in a positive shift in the poten...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00
Inventor 姜海龙张国庆李志刚刘奎仁王庆璋于萱刘福国高峰陈欣
Owner CHINA NAT OFFSHORE OIL CORP
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