Technology for Production of Highly Efficient Structural Clay Tiles From Coal Refuse Processing By-Products - Screenings and Coal Slurries

Abstract

The paper gives a general characteristic of coal refuse processing products: intermediate fractioncoal-free screenings; small fractioncarboniferous sand containing up to 30% coal; fine fractionsilt coal containing up to 50% coal. Green and baked ceramic properties of products of processing waste coal are demonstrated. Compositions of raw mixes for items with compression strength of over 10-15 MPa with a density of below 800 kg/m 3 are substantiated, with considerations for molding with semi-rigid extrusion and requirement of minimizing baking costs. Processing properties of screenings are presented as functions of material grinding and baking temperature. A process diagram has been plotted for a possible production facility using modern equipment. Technical and economic indexes are presented, showing high profitability and promising nature of manufacturing large-size structural clay tiles from the products of processing waste coal thanks to minimal prime cost of the tiles.