Producing refractory light granules from powdery refractory material and bonding agent in wet granulator, comprises supplying reaction agent containing material mixture for granulation process, and spraying water and/or aqueous solutions

摘要

The method for producing refractory light granules from a powdery refractory material of less than 500 mu m, a powdery bonding agent of less than 150 mu m and/or liquid bonding agents in a wet granulator, comprises supplying reaction agent containing a material mixture to be granulated for granulation process, and spraying and/or injecting water and/or aqueous solutions during granulation of the material mixture so that pores are formed in the granules by the formation of gas. The material mixture comprises a carbonate-containing reaction material and a reaction partner forming carbon dioxide. The method for producing refractory light granules from a powdery refractory material of less than 500 mu m and a powdery bonding agent of less than 150 mu m and/or liquid bonding agents in a wet granulator, comprises supplying reaction agent containing a material mixture to be granulated for granulation process, and spraying and/or injecting water and/or aqueous solutions during granulation of the material mixture so that pores are formed in the granules by the formation of gas. The material mixture comprises a carbonate-containing reaction material and a reaction partner forming carbon dioxide and reacting with the reaction material over a liquid phase. The pores are fixed by a solid framework, which surrounds the pores and is made of a bonding agent and a material. The reaction agent is a dry powdery material comprising reaction materials (80-97 wt.%), reaction partner (3-10 wt.%), and bonding agent (1-5 wt.%). The granules (10-15 wt.%) are processed with granulation humidity. Water vapor at 105-110[deg] C is used for the granulation. The reaction agent is used in stoichiometric quantities relative to the reaction material and the reaction partner. A refractory raw material from a refractory basic oxide, a refractory carbon modification, gelatin refractory waste product or a raw material for manufacturing refractory products is used as the refractory material. The granules are annealed at 60-500[deg] C and ceramically burned at 1000-1400[deg] C, and are obtained from the raw material and the reaction agent (83-97 wt.%) related to the drying substance of the granulating mixture. The reaction agent comprises a coating or a soaking agent, which dissolves in water and is released after the dissolution of the reaction partners for the formation of gas. Hydrophobic treatment agent based on water-soluble salts and/or water-soluble polyether siloxane are used as agent for coating or soaking. A gelling agent (6-32 wt.%) forming a gel with water or a pre-manufactured gel is used. A wallpaper glue is used as gel. An independent claim is included for refractory light granules from a powdery refractory material.