I read this article in one of the recent issues of ceramics monthly. I was intrigued by the idea of recycling since our studio generates a lot of clay slop and glaze. We usually reclaim the clay slop, but we have been amassing the glaze slop for 3 years now. I don't want to throw it away because I don't want to contaminate our drinking water For a while we were using it as a pot luck glaze, but it was just an ugly black color.
After reading the article several weeks ago I wanted to try my hand at it. But instead of bricks I wanted to make flower pots. My plan was to take the glaze and clay slurry mix and cast it into slip molds of planters and fire to bisque temperature. The planters would be given away to the studio members or people who bought from us. We use cone 6 clay and glazes. Sadly the 1:1 radio does not work for cone six. I guess because of all the fluxes in the glaze there is too much melt. The trial included slip casting a diaper bowl mold and took some shards to get fired. I put them in a throw away bowl just in case it didn't work right. What came out was a bloated blistered mess. Later on a tried about a 3 parts clay to 1 part glaze ratio and that worked better. I haven't casted and tried a full piece yet, but I will soon!
Please note because of the colorants in the glazes any molds you use will be contaminated with the glaze so they won't work well for slip casting normal ware any more. Since the molds were donated to the studio I didn't mind messing them up.