Grinding Sludge Recycling to Reduce Environmental Load

Analysis of Disturbing Factor for Briquetting of Grinding Sludge

Abstract

Most of grinding sludge is dumped into landfills now. It is responsible to establish recycling technology which enables to reduce environmental load and contribute to our recycle-based society. But it is very difficult to recycle grinding sludge because it contains a lot of coolant.From our previous researches, it was confirmed that it was possible to separate coolant from grinding sludge economically by pressing it in a cylinder. After squeezing coolant out, pressure rod compress grinding swarf with high pressure, then push it out as briquettes of grinding swarf.
Usually briquette can keep its shape because grinding swarf is curly and entangle each other. That helps to handle it easily as law material after transporting to steel maker, but sometimes briquette can't keep its shape just after briquetting. So grinding swarf and briquette were observed microscopically to clarify the cause. These observation found that it made difficult to keep briquette's shape if grinding sludge contained small amount of fine rusted particles. For this problem, it was proved that small additional cellulose was effective to keep briquette's shape.