摘要
开展了两种加压浸出工艺处理锌浸出渣的试验研究。“加压还原浸出+氧压浸出”取代原针铁矿工艺的“三段逆流热酸浸出+还原”,锌焙烧矿到铅渣的渣率为15.74%,锌、铁、铜、铟、镁的浸出率分别为99.32%、93.50%、95.02%、91.03%、99.97%,各项指标均优于原工艺,锌、铟的浸出率分别提高了1.82、11.03个百分点,反应时间由14 h缩短为4 h,液固分离次数由4次减少为2次。“两段逆流加压浸出”取代原黄钾铁矾工艺的“硅浸+预中和+黄钾铁矾沉铁”,锌焙烧矿到二段渣的渣率为35.88%,锌、铁、铜、铟、镁的浸出率分别为98.50%、4.94%、90.48%、2.69%、93.77%,各项指标均优于原工艺,浸出后液(相当于水解除铁后液)可以直接返回中性浸出工序,反应时间由16 h缩短为4 h,液固分离次数由3次减少为2次。加压浸出采用密闭的加压釜,更容易实现整个炼锌系统蒸汽平衡,无需额外增加蒸汽锅炉。
Experimental study on two technologies of pressure leaching on zinc leaching residue were studied.“The reduction pressure leaching+oxygen pressure leaching”was replaced a part of the technology of goethite,its slag yield is 15.74%,and leaching rate of Zn,Fe,Cu,In,and Mg is 99.32%,93.50%,95.02%,91.03%,and 99.97%,respectively.All indexes are better than that of the original process,leaching rate of zinc and indium rises by 1.82 and 11.03 percentage points respectively,reaction time shortens from 14 h to 4 h,and the number of liquid-solid separation reduces from 4 times to 2 times.“Two counter current pressure leaching”was replaced a part of the technology of jarosite,its slag yield is 35.88%,and leaching rate of Zn,Fe,Cu,In,and Mg is 98.50%,4.94%,90.48%,2.69%,and 93.77%,respectively.All indexes are better than that of the original process,the leach solution can be reused in neutral leaching directly,reaction time shortens from 16 h to 4 h,and the number of liquid-solid separation reduces from 3 times to 2 times.Pressurized leaching adopts closed autoclave,which is easier to realize steam balance of whole zinc smelting system without additional steam boiler.
作者
吴钧
曾鹏
周中华
姜艳
邱伟佳
张少博
杨全胜
王禹
WU Jun;ZENG Peng;ZHOU Zhong-hua;JIANG Yan;QIU Wei-jia;ZHANG Shao-bo;YANG Quan-sheng;WANG Yu(Yunnan Yuntong Zinc Co.,Ltd.,Kunming 650000,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2022年第4期31-35,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
云南省科技创新人才计划项目(2019HC025)。
关键词
湿法炼锌
针铁矿
黄钾铁矾
加压浸出
zinc hydrometallurgy
goethite
jarosite
pressure leaching
