Resin precoated sand prepared from reclaimed sand

Abstract

The invention discloses resin precoated sand prepared from reclaimed sand, belonging to the technical field of reclaimed sand. The resin precoated sand is prepared from the following raw materials in percentage by weight: 10%-80% of reclaimed sand and 20%-90% of roughing sand. A preparation method of the resin precoated sand comprises the following steps: mixing the reclaimed sand and the roughing sand and heating the mixture in a heater of a sand mixer to form hot sand, and placing the hot sand in the sand mixer when the temperature of the sand is 125-135 DEG C; and sequentially adding 1wt%-4wt% of phenolic resin based on the hot sand, 9wt%-20wt% of a curing agent based on the phenolic resin and 0.1wt%-0.2wt% of an isolator based on the hot sands to the hot sand for mixing. The resin precoated sand prepared from the reclaimed sand has the advantages of lower use level of resin, lower gas sending amount, lower thermal expansion and lower thermal expansion speed compared with those of resin precoated sand prepared from usual dry sand, so that the high casting size precision and the low casting gas waste deficiency can be obtained in the casting process, the yield of castings is improved, the manufacturing cost of casting enterprises is lowered, and good economical benefits are obtained.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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AI Technical Summary

Benefits of technology

In this new technology described in this patents, we have developed an innovative way to make high-quality coatings on refractory materials like ceramics without requiring much energy or producing large amounts of pollution during their formation processes. By reducing the cooling time needed while maintaining good quality results, these techniques help produce stronger products at less expensive prices.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality control during production of metal clad cores containing fine silica glass fillers called variances, particularly those formed within the range between 0-100 micron sizes. Existing methods involve removing excessive amounts of crude oil residue from the sand before adding these finely powdered iron sand grains together. However, there may also occur issues where some small pieces break off during handling. To address these concerns, new techniques involving applying specialized resin compositions onto surfaces of the sand were proposed.

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