Refining agent for waste aluminum to improve performance of aluminum castings

Abstract

The invention belongs to the technical field of waste aluminum smelting refining agents, and particularly relates to a refining agent for waste aluminum to improve the performance of aluminum castings. The refining agent comprises, by weight, 3-6 parts of modified graphite, 6-10 parts of nanometer calcium nitride, 2-4 parts of titanium dioxide, 1-3 parts of ammonium tetraborate, 0.8-1.6 parts of stellerite powders, 0.4-0.8 parts of aluminum oxide, 0.1-0.3 parts of sulphur, 4-6 parts of H-mordenite powders, and 0.1-0.3 parts of aluminum magnesium silicate; the modified graphite is modified by 2-hydroxypropyltrimethyl ammonium chloride chitosan as a modifying agent. Compared with the prior art, the refining agent for the waste aluminum to improve the performance of the aluminum castings hasthe advantages that the refining agent can obtain high-quality waste aluminum alloy molten fluid and reduce the microporosity of the obtained castings, and mechanical properties of the refining agentcan also be increased significantly.

Description

technical field [0001] The invention belongs to the technical field of refining agents for smelting waste aluminum, and in particular relates to a refining agent for waste aluminum that improves the performance of aluminum castings. Background technique [0002] The secondary aluminum industry has become an indispensable and important part of the development of the aluminum industry. Nearly 12 million tons of various aluminum scraps are processed into secondary aluminum alloys every year in the world, and the technology for preparing high-performance aluminum alloys from secondary aluminum is aluminum processing. Technological progress is inevitable. The biggest technical obstacle in the production of high-performance products from waste aluminum is the inability to obtain suitable chemical components. The raw materials of different aluminum alloys are effectively classified. Even the imported waste aluminum raw materials are also a mixture of raw materials with different ch...

AI Technical Summary

Problems solved by technology

[0002] The secondary aluminum industry has become an indispensable and important part of the development of the aluminum industry. Nearly 12 million tons of various aluminum scraps are processed into secondary aluminum alloys every year in the world, and the technology for preparing high-performance aluminum alloys from secondary aluminum is aluminum processing. Technological progress is inevitable. The biggest technical obstacle in the production of high-performance products from waste aluminum is the inability to obtain suitable chemical components. The raw materials of different aluminum alloys are effectively classified. Even the imported waste aluminum raw materials are also a mixture of raw materials with different chemical components. At the same time, there are many combinations of iron, copper and other metals in the recycled aluminum alloy parts or It is a composite product, so most of the waste aluminum raw materials contain high content of non-aluminum elements, such as the content of iron usually reaches 0.8%, the content of silicon reaches 4%, and the content of copper exceeds 1%. Therefore, according to the conventional production process After smelting, ingot casting and deformation processing, it is difficult to produce aluminum alloy products whose chemical composition meets the standard requirements from waste aluminum raw materials. Covering agents, slag-removing agents, slag-removing agents, refining agents, etc. are needed in the aluminum alloy smelting process. When the temperature of aluminum reaches 720°C, a refining agent needs to be added. The refining agent used in the traditional scrap aluminum manufacturing process will cause the porosity of the finished product to be high, and pores will be generated on the surface of the casting, and the proportion of oxide impurities is also high, which affects Properties of Aluminum Castings