Process for skimming oxidic rolled copper bars after casting in a continuous casting machine comprises wetting the casting with an emulsion mixed with reductant, and injecting a diluted aqueous hydrocarbon-containing solution as reductant

摘要

Skimming oxidic rolled copper bars after casting in a continuous casting machine comprises wetting the casting with an emulsion mixed with reductant containing a hydrocarbon; feeding the oxidized finished bars at 650 deg C through one or more reduction zones; and injecting a diluted aqueous hydrocarbon-containing solution as reductant into the reduction zone(s). Process for skimming oxidic rolled copper bars after casting in a continuous casting machine comprises wetting the casting with an emulsion mixed with reductant containing a hydrocarbon; feeding the oxidized finished bars at 650 deg C through one or more reduction zones; and injecting a diluted aqueous hydrocarbon-containing solution as reductant into the reduction zone(s). The amount of reductant used in the descaling path is limited to 10-35 % of the total circulating amount of the reductant for the descaling and cooling path. The non-acidic liquid reductant is continuously recirculated, cooled, and the pH and the chemical composition held constant. The speed of the chemical reactions is increased to reduce both types of oxides present by producing a bat turbulence using ultrasound. Cooling of the rolled bars in one or more cooling segments is carried out using a high amount of reductant. The rod is dried before being coated with a wax to prevent it from oxidizing.