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

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...

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 affect the open circuit potential, current capacity and current efficiency of the sacrificial anode, so it is not suitable for the refining of the sacrificial anode,, C 2 Cl 6 and C 6 Cl 6 Although the refining effect is relatively good, a large amount of Cl is released during refining 2 gas, which is seriously harmful to the human body and the environment, and should not be used

[0004] There is no report on the development of refining agents specifically for the preparation of sacrificial anodes. Therefore, it is necessary to develop a refining agent suitable for the refining of aluminum alloy sacrificial anodes, which is environmentally friendly, has low production costs, and can achieve a relatively ideal refining effect.