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  July 4, 2022 5:18 AM EDT

  refining flux refining and modifying the secondary aluminum alloy melt is mostly carried out in a static furnace.

  Refining and deterioration treatment method

  1. Use a refining agent to remove the gas and oxide inclusions contained in the melt.

  2. Use modifiers to improve the number of nucleation, crystal structure, and performance of the regenerated tongs alloy melt.

  Commonly used refining agents for recycled aluminum alloy melts are zinc chloride, hexachloroethane, nitrogen, nitrogen, sodium chloride, potassium chloride, cryolite, etc.

  Commonly used metamorphic elements for metamorphism testing are mischmetal, sodium, silver, iron, phosphorus, boron, and so on.

  In the actual process operation, in order to avoid excessive metal burning, the refining and metamorphism treatment time of the melt should not be too long. Usually, online blowing, adding modifiers,s and stirring are used to complete the operation at the same time.

  

  The day when the secondary aluminum alloy melt is refining flux and modified is to fine-tune the composition of the melted aluminum alloy melt to obtain a satisfactory aluminum alloy melt.

  In the process of refining and metamorphism, corresponding measures are taken to control the content of gas and oxidized inclusions, so that the melt meets the composition requirements of the standard (including the content of main component elements and impurity elements), and ensures that the castings obtain high-quality grain refinement structure. Most aluminum alloy melts.

  Because 70% of the raw material for the cast-in furnace of the left stone is the melt configured after the scrap aluminum alloy is melted, the biggest difference between the recycled aluminum alloy melt and the ordinary aluminum alloy melt is: that the impurity elements contain high walls and oxides. A large number of inclusions and high gas content can easily cause coarse grains, sulfur loosening, and inclusion defects in the internal structure of the casting, which will affect the final performance of the casting.

  Therefore, it is necessary to comprehensively use refining flux to improve the refining and modification effects of the recycled aluminum alloy melt, and it is best to achieve the purpose of pre-processing the raw materials to be used in the furnace.

  The refining process is to remove or minimize the gas and oxidized impurities in the recycled aluminum alloy melt to improve the degree of purification of the melt.

  The requirements for the purity of secondary aluminum alloy melts are generally different due to different varieties and uses.

  It is usually required that the hydrogen content per 100g of aluminum is less than 0.2ml, and for some special aluminum alloys, the hydrogen content per 100g of aluminum should be controlled to be less than 0.1ml.

  In actual production, metallographic analysis is used to qualitatively analyze the pinhole degree in the aluminum alloy structure to measure the hydrogen content.

  Since the detection of non-metallic inclusions cannot be accurately quantified, it is difficult to have quantitative requirements, and they can only be measured by metallographic analysis of the ingot structure.

  Finally, comprehensively judge the quality of the melt refining treatment effect, and determine the process parameters of the refining treatment.