China Nonferrous Metallurgy

The converter slag produced by Chuxiong Dianzhong Nonferrous Metals Co., Ltd. has a continuously high copper content, which has impacts on the subsequent production operation and process index control of copper slag flotation. In response to this problem, the company studied the chemical composition and phase of the converter slag, the loss form of copper metal in the converter slag, and the copper content data of the converter slag. The copper matte grade, the amount of cold material added, the timing of addition, and the size of the particle size, the amount of quartz flux added, slagging and slag discharge operations were also analyzed in depth, and control measures to reduce the copper content in the slag were put forward. The main measures were such as controlling the oxygen-enriched concentration of converter blowing at 23%-25%, controlling the particle size of the cold material entering the furnace under 300mm, and strictly implementing the cold material adding system, controlling the silicon dioxide content of converter slag at 19%-24%; standardizing slagging end point determination and slag discharge operation, etc. By adopting the above rectification measures, the copper content of the converter slag was reduced from 6% to 3%, which can be continuously and stably controlled, and the metal copper recovery rate has been increased.