Making method of red mud modified asphalt

Abstract

The invention discloses a making method of red mud modified asphalt. The method comprises the following steps: 1, calcining red mud at 900 DEG C, and grinding the calcined red mud; and 2, mixing 13 parts by weight of the red mud obtained in step 1 with 100 parts by weight of asphalt to obtain the red mud modified asphalt. The red mud is industrial waste residues generated in the alumina extraction process in the aluminum making industry. A result of test researches shows that the 900 DEG C calcined red mud has good activity. The red mud is added to reduce the penetration and the 15 DEG C ductility of the asphalt and rise the softening point, and the red mud and matrix asphalt form a uniform and stable blend system, so the temperature sensitivity and the high temperature stability of the asphalt are improved; and the red mud is used as a modifying material, so a new way is provided for solving the problem of waste residues in the aluminum ore industry, recycling and extension of the industry chain, and the problem of pollution of the red mud to environment is effectively solved in the invention.

Description

Technical field [0001] The invention relates to the field of asphalt, in particular to a method for preparing red mud modified asphalt. Background technique [0002] At present, the extraction of iron elements in red mud is mainly used in the practical application of high-speed iron red mud magnetic separation and separation of iron concentrates; the original iron extraction cannot meet the requirements of industrialized production due to high temperature operation and complicated equipment process conditions. Rare metals such as Ti and Sc can be extracted from red mud to obtain higher value-added products, but the current research is still in the laboratory stage. [0003] Because of its high refining cost, complicated process, and easy to produce acid pollution, it cannot be applied in industrial production. The use of red mud as a civil construction material has achieved practical results, especially in the cement industry, but the amount of red mud processed is small, and it i...

AI Technical Summary

Problems solved by technology

However, due to the special properties of red mud, there are some problems in the comprehensive utilization of red mud: in the process of recovering iron from red mud, if the magnetization roasting-magnetic separation method is used, the cost is too high; In the process of preparing building materials from red mud, it is usually necessary to add a certain amount of admixture to reduce harmful substances such as radioactive elements and alkali content in red mud to meet the basic requirements of building materials; Mud building materials will have a certain degree of frosting, which affects the strength and appearance; when red mud is used as an adsorbent, because red mud itself contains a certain amount of heavy metal ions, it will appear in the process of wastewater treatment. Metal anti-dissolution phenomenon, thus affecting the treatment effect

Images