Process for regenerating forced scrubbing water glass used sand through wet method

Abstract

The invention discloses a process for regenerating forced scrubbing water glass used sand through a wet method, which comprises the following steps of: firstly, loading collected old sand into a jaw crusher to perform crushing, and conveying the crushed old sand into a magnetic separator to perform magnetic separation; secondly, putting sand grains after the magnetic separation into a first stage spiral sand-water separator, a first stage wet method regenerator and a second stage spiral sand-water separator to perform sand-water separation on the old sand; thirdly, neutralizing the sand after the separation by a neutralizing sedimentation basin; fourthly, performing sand-water separation for the second time through a second stage wet method regenerator and a third stage spiral sand-water separator to ensure that water glass existing in the old sand can be thoroughly eliminated cleanly; and finally, performing dust elimination and drying to obtain sand grains namely the finished products which are put into a sand storage. The process adopts a device with a simple and novel structure, a compact and reasonable system composition and fewer wear-out parts. The process has a high elimination ratio of Na2O in the old sand, and the regenerated sand is good in quality and can be recycled repeatedly for use; besides, the process has small water consumption, realizes recycling by using water and plays a positive role in protecting the environment.

Description

technical field [0001] The invention relates to a process for regenerating old sand, in particular to a process for regenerating old sand in strong scrubbing water glass by wet method. Background technique: [0002] Most foundry enterprises in my country are still using CO 2 Water glass quartz sand process, this process makes the film removal rate of water glass in the old sand low, about 5-10%. Due to the poor collapsibility of the old sand after production, the quality of the recycled sand is not high, and it is difficult to reuse. Generally, it can only be used as back sand or basically discarded. A large amount of Na remains on the surface of the discarded old sand. 2 When O meets water, it turns into NaOH, which is strongly alkaline, completely destroying the soil environment and causing environmental pollution. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a low energy consumption, Na 2 Wet regenerati...

AI Technical Summary

Problems solved by technology

[0002] Most foundry enterprises in my country are still using CO 2 Water glass quartz sand process, this process makes the film removal rate of water glass in the old sand low, about 5-10%

Due to the poor collapsibility of the old sand after production, the quality of the recycled sand is not high, and it is difficult to reuse

Generally, it can only be used as back sand or basically discarded. A large amount of Na remains on the surface of the discarded old sand. 2 When O meets water, it turns into NaOH and is strongly alkaline, which completely destroys the soil environment and causes environmental pollution.