HGMS technique application to environment improvement resulting from material recycling system (I) -- Recovery and recycling of glass grinding sludge

Recovering the cathod ray tube (CRT) glass grinding waste slurry which is composed of glass powder, abrasives and iron wear particles, from refuse and recycling of the slurry as a raw material for glass were made practical by applying the HGMS technique to remove iron from the slurry, because the presence of iron lowers the glass clarity. The HGMS, set-up on a commercial scale was developed. The set up is rectangular with reciprocal motion passing through the 2.5 kOe low magnetic field obtained by permanent magnets. Removal of more than 88 % of the total iron content in the solids could be attained at a throughput of as high as 500 tons per hour of the glass grinding slurry containing 0.2 % suspended solids without garnet. From 8 to 15 tons of the sludge on a dry basis per day have been recycled. This paper shows how a waste slurry, which was drained off and considered as a waste product from the factory, could be economically changed into reusable material.