编辑: xiaoshou | 2019-04-15 |
工业实践表明,对于铜品位7%~10%的金精粉,全流程铜的回收率达到97%,酸浸渣含铜低于0.3%,氰化金浸出率96.84%,银浸出率75.45%,烟气SO2总转化率平均98.74%,处理后的烟气SO2浓度0.061%. 关键词:高铜金精矿;
沸腾焙烧;
工业实践;
氰化 中图分类号:TF831 文献标志码:A 文章编号:1007-7545(2014)04-0000-00 Industrial Practice of Fluidized Roasting of High-grade Copper-bearing Gold Concentrate YANG Yao-feng, SONG Yao-yuan, ZHAO Ke-jiang, L? Juan-sha, SHAO Zhi-heng (Gold Smeltery Branch, Lingbao Gold Company Ltd., Lingbao 472500, Henan, China) Abstract:High-grade copper-bearing gold concentrate was treated by processes of fluidized sulfating roasting, acid leaching, and cyaniding leaching. The industrial practice shows that copper total recovery rate is 97%, copper in acid leaching slag is below 0.3%, gold and silver cyaniding leaching rate is 96.84% and 75.45%, the average total conversion rate of SO2 is 98.74%, and SO2 concentration in waste gas is 0.061% when the gold concentrate bearing 7%~10% copper is treated by the above processes. Key words:high-grade copper-bearing gold concentrate;
fluidized roasting;
industrial practice;
cyaniding 高铜金精矿的处理难度较大,我们通过小型试验的摸索,采用硫酸化焙烧―酸浸提铜―氰化法提取金、银的工艺流程处理高铜金精矿具有较好的工艺指标,能够有效回收高铜金精矿中各种伴生有价元素,并确定了最佳试验条件.本文在此基础上,拟通过一系列的半工业化及工业化试验研究,探索实现难处理高铜(7%~10%)金精矿高效处理产业化的工艺条件.
1 高铜金精矿硫酸化焙烧 沸腾炉进料方式采用浆式进料或干式进料,干式进料工艺复杂、投资高.工业化试验采用浆式进料,其优点是:取消干燥工序,省掉干燥烟气的处理系统.可节省投资;
消除干燥工序高铜精矿的机械损失及干燥过程中煤灰混入高铜精矿中引起金氰化浸出率的降低;
节省用煤,降低生产成本;
消除干燥工序中硫的损失. 采用电动双梁起重机上料,浆化槽调至65%~70%左右,调浆后矿浆通过振动筛,筛上选杂,筛下进贮浆槽,采用软管泵打入炉前中间槽.料浆由炉前中间槽给入30.86 m2的沸腾焙烧炉进行焙烧.
2 酸浸―萃取法提铜 焙烧车间沸腾炉产出的焙砂进酸浸槽进行酸浸,每天处理的焙砂量为90 t,酸浸矿浆经泵送酸浸一级、二级浓缩机、胶带过滤机洗涤过滤后,产出的酸浸液经过滤后送电铜车间,酸浸渣用清水进行逆流洗涤后送入氰化槽.焙烧酸浸过程所用主要设备及其规格如表1所示. 表1 焙烧酸浸主要设备及规格 Table
1 Main equipments and their specification for roasting and acid leaching 设备名称 规格/m 有效容量/m3 矿量/t 单时矿量/t 停留时间/h 累计时间/h 酸浸槽 一段 Φ2.5*2.5 9.14 6.09 2.74 2.22 2.22 二段 Φ2.5*2.5 9.14 6.09 2.74 2.22 2.22 二段备用槽 Φ3.0*3.5 15.39 10.25 2.74 3.74 5.96 酸浸浓密机 Φ12*2.35 226.08 25.50 5.48 4.65 21.36
28 m2胶带机 0.14 0.22 5.48 0.04 21.40 收稿日期:2013-10-08 作者简介:杨要峰(1972-),男,河南平顶山人,工程师. 工业化试验中,硫酸化焙烧温度为660 ℃,焙砂酸浸条件为:液固比2∶