A new type of chemical regeneration method for used water glass sand

Abstract

The invention discloses a novel water glass old sand chemical regeneration method, which belongs to the field of resource recovery and utilization in the foundry industry. The present invention adopts two-component reagent composed of calcium oxide and distilled water, emulsion composed of sucrose and calcium oxide, calcium chloride aqueous solution, etc. to regenerate the old sand, and regenerates the regenerated sand after the reagent is mixed with the old sand and sealed for 0-24 hours. Prepare samples, and test the performance of sample preparation, including instant strength, final strength and collapsibility, as well as the sodium carbonate content of regenerated sand, and compare the performance with new sand and old sand after the test is completed. Comprehensively considering the above-mentioned various performance indexes, among several regeneration methods of the present invention, the performance indexes of the regenerated sand obtained by using (calcium oxide+distilled water) regeneration for 12 hours are the best; compared with the new sand, the instant strength is improved by 60%; The final strength is increased by 154%; the collapsibility is slightly worse than that of new sand, but better than that of old sand; the content of sodium carbonate is reduced by 1.38% compared with that of old sand, which meets the requirements for use.

Description

technical field [0001] The invention belongs to the field of resource recovery and utilization in the foundry industry, and in particular relates to a novel chemical regeneration method for used water glass sand. Background technique [0002] As a big foundry country, my country needs to transform into a powerful foundry country in the new era, which requires more attention to environmental protection and energy conservation. Water glass old sand is divided into two types, ester hardened old sand and CO 2 Hardened old sand, considering the wide use of water glass sand in the foundry industry, in order to avoid the destruction of the environment and waste of resources caused by the random disposal of used old sand, it is necessary to regenerate the old sand. Under today's technology, there are a variety of regeneration schemes including physical and chemical forms, such as dry regeneration, wet regeneration, composite regeneration and chemical regeneration, etc. These techno...

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Problems solved by technology

Under today's technology, there are a variety of regeneration schemes including physical and chemical forms, such as dry regeneration, wet regeneration, composite regeneration and chemical regeneration, etc. These technologies have their own advantages and disadvantages, dry and wet regeneration At present, there have been sufficient researches. The dry regeneration operation is simple and easy to implement, but the reusability and stripping rate are low; the wet regeneration effect is good, but it requires a large amount of water, which makes sewage treatment difficult; and in chemical regeneration In terms of technology, there are few researches at home and abroad. The current main achievement is that the strength of regenerated sand obtained by using sodium hydroxide for regeneration treatment has been greatly improved, but the continuous accumulation of regenerated sand alkalinity (mainly sodium carbonate and sodium acetate) will cause Affect the performance of reclaimed sand, and the direct discharge of waste sand will pollute the environment

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