DOC《硫铁矿烧渣氯化焙烧扩大试验》

硫铁矿烧渣氯化焙烧扩大试验 常耀超,徐晓辉,王云 (北京矿冶研究总院,北京 100160) 摘要:采用氯化焙烧工艺从硫铁矿烧渣球团中综合回收金、银、铜等有价金属,考察了造球、窑温、停留时间对金属挥发率以及物料和金属平衡的影响.

结果表明,物料在1

250 ℃停留1.83 h的最佳条件下,各金属挥发率为:Au 95.6%、Ag 52.5%、Cu 73.1%、Pb 93.9%、Zn 75.2%.球团中铜、铅、锌含量均小于0.1%,球团强度4 0~6.5 kN. 关键词:硫铁矿烧渣;

氯化焙烧;

造球;

回转窑;

氯化球团 中图分类号:TF802+.67 文献标志码:A 文章编号:1007-7545(2013)01-0000-00 Chloridizing Roasting Expanding Test of Pyrite Cinder CHANG Yao-chao, XYU Xiao-hui, WANG Yun (Beijing General Research Institute of Mining & Metallurgy, Beijing 100160, China) Abstract: Valuable metals such as Au, Ag, and Cu were comprehensively recovered from pyrite cinder by chloridizing roasting process. The effects of pelletizing, roasting temperature and staying duration on metal volatilization rates and mass balance of materials and metals were investigated. The results show that the volatilization rates of Au, Ag, Cu, Pb, Zn are 95.6%, 52.5%, 73.1%, 93.9%, and 75.2% respectively under the optimum conditions including roasting temperature of

1 250 ℃ and staying duration of 1.83 h. The contents of Cu, Pb, Zn in chloridizing pellet are all below 0.1%, and the compression strength of pellet is

4 0~6.5 kN. Key words: pyrite cinder;

chloridizing roasting;

pelletizing;

rotary kiln;

chloridizing pellet 硫铁矿烧渣为制硫酸的副产物,除含有铁外[1-2],还含有大量的铜、铅、锌、金、银等有价金属.烧渣中金属矿物形态一般以氧化物和硫化物为主,少量为铁酸盐和硫酸盐.烧渣中金属元素超标对炼铁不利,采用一般的冶炼方法,不能经济有效地加以处理.而氯化焙烧法处理烧渣,一方面使有害元素脱除以满足炼铁的要求,另一方面综合回收有价金属,达到综合利用的目的[3].氯化焙烧法主要有中温氯化[4]、氯化离析[5]和高温氯化[6-7].本试验采用高温氯化法综合回收硫铁矿烧渣中的有价金属.

1 试验原料 试验原料来自山东某厂的硫铁矿制酸烧渣,真密度4.06 t/m3,堆密度1.19 t/m3.烧渣含Au 1.94 g/t、Ag 26.81 g/t,其余元素化学分析结果(%):Cu 0.

27、Pb 0.

29、Zn 0.

37、全Fe 61.

84、全S 0.

56、Al2O3 1.

47、CaO 0.

36、SiO2 4.95.与铁精粉质量标准相比(Cu