Comprehensive recycling method of waste sand in green casting

Abstract

The invention relates to a comprehensive recycling method of waste sand in green casting, and belongs to the field of novel casting processes. The comprehensive recycling method of the waste sand in green casting is characterized in that the waste sand in green casting is recycled through the following steps: a first level of magnetic separation and smashing, a second level of magnetic separation, screening, dewatering and drying, a first level of mechanical friction demoulding, a first level of winnowing and dedusting, a second level of winnowing and dedusting, a third level of mechanical friction demoulding, a third level of boiling, dedusting and screening; and finally qualified recycled sand is obtained. A permanent magnet belt magnetic separation machine is used in the first magnetic separation of the waste sand, a three-return-stroke roller dryer is adopted during dewatering and drying, a suspension-type magnetic separation machine is adopted in the second level magnetic separation, centrifugal mechanical friction demoulding is adopted in the first level of mechanical friction demoulding and the second level of mechanical friction demoulding, streaming mode winnowing and a pulse-bag-type dedusting machine are adopted in the first level of winnowing and dedusting and the second level of winnowing and dedusting, vortex kneading demoulding is adopted in the three level of mechanical friction demoulding, and a fluidized bed and the pulse-bag-type dedusting machine are adopted in the third level of boiling and dedusting.

Description

technical field [0001] The invention relates to a regeneration and comprehensive utilization method of waste sand in green casting, which belongs to the field of new foundry technology. Background technique [0002] The foundry industry is an indispensable industry in the machinery manufacturing industry. Among them, the proportion of sand casting accounts for 80%-90%. At present, the annual output of castings in my country is more than 10 million tons, and the amount of recycled sand is as high as 100 million tons. The recovery rate of old sand can generally reach 80%-90%, and 10%-20% of recycled old sand must be discarded continuously. Based on the calculation of 10% waste, 10 million tons of old sand is discarded in a year in the whole country, that is, 1 ton of new sand needs to be added to produce 1 ton of castings, and 1 ton of old sand must be discarded. In casting, most of the sand used is high-quality quartz sand. However, there is a relative shortage of high-qua...

AI Technical Summary

Problems solved by technology

In my country, the development of used sand regeneration technology is relatively backward, and the regeneration process is cumbersome and complicated, and the cost is high, so it is rarely used.