Regeneration method of organic waste sand

Abstract

The invention relates to the technical field of waste sand regeneration, in particular to a regeneration method of organic waste sand. The regeneration method comprises the following steps of (1) crushing, specifically, crushing organic waste sand by using a crusher; (2) magnetic separation, specifically, carrying out magnetic separation on the crushed organic waste sand by using a magnetic separator; (3) acid leaching, specifically, soaking the organic waste sand subjected to magnetic separation with a weak acid solution; (4) hot air grinding, specifically, feeding the organic waste sand subjected to acid leaching into a hot air grinding machine to be ground, and supplying air and exhausting air at the same time; (5) roasting, specifically, roasting the ground organic waste sand to obtain regenerated sand; and (6) screening and packaging. According to the regeneration method of the organic waste sand, the weak acid solution is adopted to soak the organic waste sand before roasting, the weak acid can chemically react with bentonite, the cohesiveness of the bentonite is reduced, and surface substances of the organic waste sand can easily fall off during subsequent grinding and roasting.

Description

technical field [0001] The invention relates to the technical field of waste sand regeneration, in particular to a regeneration method of organic waste sand. Background technique [0002] With the rapid development of domestic high-speed rail, heavy trucks, loaders, shipbuilding and nuclear industries, the demand for large steel castings is increasing, which provides a good opportunity for the development of my country's foundry industry. The production of excellent large steel castings not only It requires a mature casting process and excellent molding materials for matching. Organic coated sand is adopted by many foundries because of its high strength, fast efficiency and wide application range. [0003] The ratio of castings and molding materials is usually 1:1, that is, for every ton of castings produced, 1 ton of molding material sand is consumed and 1 ton of organic waste sand is discharged. The annual domestic casting output is over one million tons. It can be seen th...

AI Technical Summary

Problems solved by technology

At present, domestic organic waste sand regeneration treatment methods mostly adopt thermal method plus mechanical grinding process, often due to insufficient roasting and grinding of bentonite, the acid consumption value and mud content of the reclaimed sand are often high