| 摘要 |
FIELD: chemistry.SUBSTANCE: method of obtaining dry zinc white includes zinc evaporation in evaporation furnace at temperature 1200-1350°C and vacuum in the system furnace-exhaust fan 50-100 Pa from the surface of zinc melt 3-5 mwith thickness of zinc melt 250-350 mm. Removal of zinc vapours from the evaporation zone is realised at the height 450-55 mm from the melt surface. Layer of zinc melt is heated from both sides of furnace due to combustion of natural gas in zones of heating, separated from zinc melt with brickwork of refractory bricks. Zones of heating are divided into 1200-1350 mm long sections. After that, oxidation of zinc vapours in reactor of dry zinc white synthesis is carried out with air oxygen heated to 180-300°C. Air intake is performed from the height of 10-15 m. Mixing of zinc vapours and air is carried out for not less than 2 s in mode of tangential introduction of their flows from the opposite sides of reactor. Obtained aerosol of dry zinc white is transported by whitewash line into section of zinc white and air separation. After that, collection of zinc white in tanks and discharge into packing containers are carried out.EFFECT: invention makes it possible to reduce loss of zinc, dry zinc white and natural gas consumption, increase output of product, obtain finely disperse dry zinc white of high quality in continuous mode for 2-3 months.6 cl, 2 dwg, 1 tbl |
