Increasing secondary silumins quality in the condi-tions of prezent day production

Abstract

Due to the lack of domestic production of primary aluminum in Ukraine, an actual problem is the development of technological processes for producing high-quality aluminum alloys using secondary raw materials. It is known that secondary aluminum raw materials are characterized by a high content of undesirable impurities, which makes it difficult to obtain alloys with the required level of technological and mechanical properties. Goal. The aim is development of a technology for the production of aluminum alloys from secondary raw materials that meet the requirements of modern standards and technical conditions. Methodology. Development of a complex technology, including the hereditary modification of liquid metal by a fine crystalline charge and impurity modification by modifier MK-1. Results. Complex modification provided a reduction in the size and shape parameter of intermetallic phases and silicon particles, which positively affected the mechanical properties of the alloys. Originality. It was established that complex modification made it possible to neutralize the negative effect of iron, which is the most harmful impurity in secondary alloys. It was established, that silumin AK7 with Fe content up to 1.84 % meets the requirements of the standard for mechanical properties. Practical value. The results of industrial tests showed that the developed technology of complex modification expands the possibilities of producing silumins of the required quality using cheap secondary raw materials.