| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: casing method includes bitstone of heat-insulating layer into casing of cathode device, erection of fireproof layer, installation of bottom and side blocks with following sealing of joints between them by cold-tamped bottom mass. During charging of heat-insulating layer it is used nongraphitic carbon or powder of silica-alumina or aluminous composition pre-mixed with nongraphitic carbon. Formation of fireproof layer is implemented by charging of powder of silica-alumina composition and its sealing by vibration compaction up to receiving of apparent porosity of fireproof layer not more than 17%. It is used powder of silica-alumina or aluminous composition from 20 up to 80% of total mass of heat-insulating layer and not less than for 70% consisting of particles of dimensions less than 0.040 mm and with thermal-conductivity coefficient not more than 0.18 Wt/mK. In the capacity of nongraphitic carbon there are used smoke black, brown coal char. In the capacity of aluminous composition it can be used argil, 60-70% of which consists of particles of dimensions less than 0.1 mm. In the capacity of aluminous composition it can be used chamotte powder with content of aluminium oxide 27-34%. ^ EFFECT: cost cutting of covering material, reduction of power inputs, life time increasing of electrolytic cell, reduction of man-hours and blocking of fireproof layer. ^ 6 cl, 4 dwg |
