原矿焙烧工艺的技术改造

Process Optimization of Whole Ore Roasting

中国第一座采用原矿焙烧工艺的紫木凼金矿黄金冶炼厂经过7年的运行,基本达到了设计生产能力。但由于设备老化,焙烧效果不好,金浸出指标下滑,再加上近年来原矿金品位下降,致使企业经济效益降低。通过对沸腾焙烧炉、气-气换热器、旋风收尘器、炉前风机和尾排风机、尾气吸收系统的改造,使金回收率大幅提高,各项指标得以改善,从而使该工艺更趋完善。

Zimudang gold smeltery, the first smeltery applying whole ore roasting in China, has been running for 7 years and roughly reaches the designed capacity. But with the problems like aging equipment, bad roasting effect, de- creasing leaching rate as well as the grade decline in gold ores, profits of enterprises are becoming scarce and produc- tion seems hard to sustain. Gold reeovery rate is increased by the optimization of fluidized bed roaster, air-air heat ex- ehanger,rotoclone collector, stoke hole fan and exhaust blower, and off-gas collection system. Each indicator is en- hanced making the process more complete.