Novel boron compound-containing aluminium alloy deironing flux

Abstract

The invention provides aluminium alloy deironing flux, which is characterized by comprising the following components by weight: 10-20% of sodium chloride (NaCl), 10-20% of potassium chloride (KCl), 10-20% of cryolite (Na3AlF6), 10-20% of sodium fluoride (NaF), 30-40% of boric acid (H3BO3) and / or boron carbide (B4C). The purifying flux provided by the invention has the advantages of continuous deironing, convenient operation and the like, and can effectively remove iron element in aluminium melt. When in use, the boron compounds in the flux react with the impurity of iron element to form high-melting point boron iron compounds which are captured by slag and mixed with the slag, so as to effectively reduce the iron content in aluminium alloy. The flux is suitable for melting requirements of aluminium alloy, has excellent viscosity and surface tension, and is good in separability from aluminium. The flux is good in chemical stability and less in harmful gas amount, and meets industrial hygienic standards and exhaust gas discharge standards. In addition, the flux is convenient to add, simple in operation process, and low in cost.

Description

technical field [0001] The invention relates to a flux in the technical field of nonferrous metallurgy, which uses a boride-containing flux to purify an aluminum alloy melt, especially a new type of boron-containing compound-containing aluminum alloy iron-removing flux capable of removing impurity iron . Background technique [0002] Aluminum and its alloys have low density, corrosion resistance, certain strength, good plasticity, and can be processed in various ways. They are widely used in various industrial sectors such as construction, electronics, machinery manufacturing, aerospace, and petrochemicals. At present, the production cost of primary aluminum is getting higher and higher, so the recycling of waste aluminum has become an important development direction of the current aluminum industry. There is an important problem in the process of scrap aluminum recycling and production: there are many kinds of impurities in scrap, and the impurity iron is a serious problem...

AI Technical Summary

Problems solved by technology

There is an important problem in the process of scrap aluminum recycling and production: there are many kinds of impurities in scrap, and the impurity iron is a serious problem, because the aluminum alloy standard requires extremely low limit content of iron element

It uses the extrusion force generated by the external electromagnetic field because the conductivity of the iron-rich phase is much smaller than that of the aluminum melt to separate the iron phase impurities in the aluminum melt, but it must be added after adding alloy elements (such as: Mn , Zr, etc.) on the basis of the pre-precipitation of the iron-rich phase in the melt, it can be successfully removed by electromagnetic field, and the iron content after iron removal still reaches 0.41%, and the removal effect is not ideal

Patent ZL 200610069093.9 "Aluminum Alloy Iron Removal Flux" proposed a boron-containing compound iron removal flux, but several problems were found after testing: First, the viscosity of the flux is relatively high, and it is easy to adhere to the crucible after the test, which affects the use of the crucible. And the iron removal effect is significantly reduced; the second is the iron removal agent boron oxide (B 2 o 3 ) and / or sodium borate (Na 2 B 4 o 7 ) increases in density after melting, it is difficult to float up, and it is easy to sink to the bottom of the crucible, which is not conducive to the removal of scum