A kind of water glass old sand regeneration method

Abstract

The present invention relates to a method for regenerating used water glass sand, comprising the following steps: (1) crushing used water glass sand and adding it together with an aqueous solution of ferrous sulfate into a centrifugal stirring drum, the bottom of the centrifugal stirring drum is provided with ultrasonic waves Launch rod, centrifugal stirring motor and electric heating device, and the old water glass sand is regenerated by mechanical-ultrasonic wet method in the centrifugal stirring drum; (2) The regenerated sand-water mixture is dehydrated to obtain wet regenerated sand and waste water. The wet regenerated sand is dried and screened to obtain the water glass regenerated sand. The method for regenerating old water glass sand of the present invention adopts the combined action of ultrasonic, centrifugal stirring and electric heating device, which increases the efficiency of regeneration. Regeneration of old sand with high water glass.

Description

technical field [0001] The invention belongs to the technical field of regeneration and recovery of foundry sand, and in particular relates to a method for regeneration of used water glass sand. Background technique [0002] The foundry industry is still one of the basic processes of the modern machinery manufacturing industry, and occupies a very important position in the manufacture of various mechanical equipment such as steel, electric power, automobiles, and aerospace. my country's casting output ranks first in the world all year round, and it is a veritable foundry country. However, my country's foundry industry has always been an extensive development model, and high energy consumption, material consumption and waste discharge have not been effectively dealt with. [0003] Sodium silicate inorganic binder is the most successful inorganic binder in production and application at present, and its advantages are very obvious, that is, it will not emit toxic and harmful g...

AI Technical Summary

Problems solved by technology

However, during the dry regeneration process, due to frictional heat, the frozen layer on the surface of the old sand begins to melt, and the regeneration effect of the dry method after freezing is not ideal.

CN107159837A discloses a drum wet regeneration and dehydration integrated equipment and its use method. The equipment and its use method use centrifugal force to rotate old sand and water, and there is no equipment for the residual binder vitrified on the old sand surface under high temperature. Therefore, the cleaning power of the adhesive film remaining on the sand surface is insufficient, and a good regeneration effect cannot be achieved.

However, this method needs to heat water at 100°C to obtain steam, so it consumes a lot of energy, and the residual binder is difficult to dissolve and remove in the steam state

Images