Used water glass sand regeneration method

Abstract

The invention discloses a used water glass sand regeneration method which mainly comprises the steps of: (1) adding wastewater to used water glass sand for pulverization, separating the used sand by using a crusher, and recovering with a dry process; (2) in the dry-process recovering process, removing sodium oxide in the used sand, and simultaneously separating out dust and sinter in the used sand together; (3) in a wet-process regeneration process, washing the used sand recovered with the dry process with water, scrubbing and removing the sodium oxide again; and (4), dehydrating the regenerated water glass sand, drying, cooling, modeling facing sand, and delivering to a sand warehouse for storage for later use. In the invention, the technologies of dry-processing recovering, wet-process regeneration and facing sand modeling are comprehensively utilized to regenerate the used water glass sand and collect and comprehensively utilize sludge generated after precipitation and wastes generated from other regenerated sands, thereby the purposes of saving energy, reducing energy consumption, lightening pollution, reducing cost, improving quality and realizing green casting are achieved.

Description

Technical field: [0001] The invention relates to a method for regenerating metal casting materials, in particular to a method for regenerating old water glass sand, which is suitable for regeneration and recovery of water glass old sand. technical background: [0002] Currently, water glass sand CO? The production of steel castings by hardening molding has the advantages of simple process, low cost, non-toxic, tasteless, and abundant sources, but it is difficult to regenerate old sand, poor collapsibility and difficult to break, and the effect of general regeneration methods is poor. Wet regeneration of sewage and sludge treatment are more difficult. Difficult, so a large amount of old sand is discharged as production waste. With the increasing control of environmental protection, resources and energy, the freight costs continue to rise, and the price of new sand is still on the rise. The old sand is no longer industrial waste, especially the recycling of the old water gla...

AI Technical Summary

Problems solved by technology

Wet recycled water glass old sand is of high quality, the film removal rate can be greater than 90%, and the recovery rate is high; however, its regeneration process and equipment system are relatively complicated, and the wet recycled sewage needs to be treated for recycling or harmless discharge