THE EFFECT OF SLAG FROM THE PRODUCTION OF METALLIC CHROMIUM ON THE TECHNICAL CHARACTERISTICS OF ACID-RESISTANT TILES
Object of research: acid-resistant tiles obtained on the basis of unenriched kaolin and waste of non-ferrous metallurgy - slag from the production of metallic chromium, non-ferrous metallurgy wastes occupy the second place after chemical production waste in terms of the amount of especially harmful various pollutants. Various environmental pollutants, such as dust and slag, containing very harmful substances (especially hexavalent chromium, antimony, arsenic, lead and mercury) have a very negative impact on the health of people living within a radius of 50 km from metallurgical plants. The use of large-tonnage waste of non-ferrous metallurgy - aluminum-containing slag from the production of metallic chromium in an amount of 40 % allows to obtain acid-resistant tiles with high physical, mechanical and chemical parameters at a firing temperature of 1300 °C and reduce environmental stress in the area of non-ferrous metallurgy production. Studies have shown that it is impossible to obtain acid-resistant tiles from non-enriched kaolin clay containing less than 18 % A1<sub>2</sub>O<sub>3</sub> even at a firing temperature of 1300 °C. The introduction of an optimal amount of chamotte (40 %) into the ceramic mass allows to obtain acid-resistant tiles that meet the requirements of GOST for physical and mechanical parameters at a firing temperature of 1300 °C. The use of aluminum-containing slag from the production of metallic chromium in ceramic compositions in an amount of 40 % (as well as chamotte) allows to obtain products with high physical, mechanical and chemical parameters at a firing temperature of 1250 °C. The introduction of alumina-containing aluminum-containing slag from the production of metallic chromium into the compositions of ceramic masses contributes to the formation of corundum. Corundum is characterized by high chemical resistance to acidic and alkaline reagents. At this temperature, even HF practically does not affect it.