Abstract
The spent liquid glass mixture, which is widely used in foundries as a binder after knocking out of moldings, contains pieces of different sizes and strengths, and there is a strong silicate film on the sand grains themselves. The proposed regeneration plants, which provide for the removal of the silicate film by scrubbing, have low productivity and lead to abrasion of the grains themselves. For this reason, the knocked-out mixture is taken to the dump. As a result of the study of the state of the spent liquid glass mixture in the dump, it was found that, in the spent mixture that had lain for 8–10 years, under prolonged exposure to atmospheric precipitation at plus and minus temperatures, part of the silicate film dissolves and almost all monolithic pieces are destroyed. Further use of hydraulic regeneration allows us to reduce the film thickness and thereby reduce the percentage of liquid glass from 5–5.5% to 0.8–1.2%. This made it possible to select the composition of the molding sand for an automatic line, using the AlpHaset-process, which consists of 22–29% of liquid glass mixture from a dump, 65–72% of liquid glass, 5.5% of liquid glass, and a hardener in the amount of 0.55%.
Highlights
Among all types of inventory production, foundry shows the greatest material use coefficient as reaching 70–90%
1К20303-type molding sand, it was found that its stability could be reached only wi resin content ofa 1.8–2.0%, hardener shareofofthe of the resin and a recl a resin content of 1.8–2.0%, hardener ashare of 26–28%
It has been established that wet regeneration, provided for a molding sandy clay mixture, partially removes the liquid glass film, and the degree of its removal depends on the shelf life of the mixture in the dump
Summary
Among all types of inventory production, foundry shows the greatest material use coefficient as reaching 70–90%. Current technology is capable of producing molds with a weight ranging from several grams to 100, and more, tons [1]. Foundry production is represented by independent foundry plants, machine engineering enterprise divisions, and metallurgical complexes [2]. Their structures depend on the range of produced castings and scope of production. This determines the selection of the molding technology, such as expendable green sand molds, cold-hardening mixture molds (CHMs), liquid glass mixture molds (LGMs), shell molds, etc.
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