Combined treatment method for used water glass sand reclamation and reclamation treating liquid concentration

Abstract

The invention relates to a combined treatment method for used water glass sand reclamation and reclamation treating liquid concentration. The combined treatment method comprises the steps of: adding used water glass sand reclamation treating liquid into a concentration device, and placing used water glass sand into a used water glass sand reclamation device; leading in water vapor being 100 DEG C or water vapor being above g 100 DEG C to the concentration device, heating, evaporating and concentrating the used water glass sand reclamation treating liquid; discharging secondary vapor from the concentration device to lead into the used water glass sand reclamation device; and spraying and leaching the used water glass sand with the led-in vapor, so as to obtain the reclaimed water glass sand. According to the combined treatment method for the used water glass sand reclamation and liquid concentration treatment, the removal rate on the residual adhesive films of the used sand is high, and the treating effect is good, the reclaimed sand subjected to dewatering and drying treatment can meet the casting requirement; and the water consumption is little, concentrated waste water is simply and feasibly utilized, the energy consumption is little, and the water glass sand can be effectively reclaimed and utilized, thereby saving resources and lowering the cost.

Description

technical field [0001] The invention relates to a combined process method for regenerating old water glass sand and concentrating the regenerated treatment liquid. Background technique [0002] Over the years, the regeneration methods of sodium silicate old sand include dry method, wet method, chemical method, etc., and dry method and wet method are the main methods. Collision and friction realize the recycling of old sand. The removal rate of the residue on the surface of old sand by dry method is only 5%~15%. 2 Defects such as serious O accumulation and poor collapsibility. Wet regeneration uses water dissolution, scrubbing and mechanical stirring to remove 70% to 90% of the residues on the surface of old sand, but it consumes a lot of water. It consumes about 2 to 3 tons of water to process one ton of sand, and the processing system is huge and complicated. , The cost is high, the wet method regenerates sewage, and the sludge treatment is more difficult. Due to the uns...

AI Technical Summary

Problems solved by technology

However, it is still not solved in the recycling process of sodium silicate old sand, Na 2 The accumulation of O will still deteriorate the high temperature performance of water glass type (core) sand

[0008] In addition, due to the strong alkalinity of the wastewater treated by wet regeneration, the pH is greater than 10, but Na 2 O, SiO 2 The concentration is low, making it difficult to use

Generally, the alkali is neutralized by adding acid, and then discharged after flocculation by adding a flocculant, which not only increases the sewage discharge and treatment costs, but also wastes resources such as water glass.

In a word, so far, there has been no satisfactory solution for the regeneration of water glass old sand and the utilization of treatment fluid.

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