摘要
基于Metcal建立的锌氧压浸出—浸出液中和除铁流程模型对全流程物料进行了计算。结果表明,在锌精矿投入量25 t/h、焙砂加入量合计2.69 t/h时,产出中和渣约1.04 t/h,含Zn 20.928%、Pb 4.211%、Fe 34.919%。中和渣返回一段反应釜后所需氧气为3588.98 m^(3)/h(标态,下同),一段氧压氧气利用率为55%左右。二段氧压浸出所需氧气为2141.24 m^(3)/h,二段氧压氧气利用率为26.9%。除铁过程中氧气利用率为11.8%。通过与现场物料化验结果对比分析,一段底流样品中Zn、Pb、S、Fe模拟计算结果与化验结果相对偏差分别为4.96%、6.27%、7.59%、5.51%。二段底流样品中Zn、Pb、S、Fe模拟计算结果与化验结果相对偏差分别为8.75%、0.73%、4.70%、2.48%。中和渣样品中Zn、Pb、Fe模拟计算结果与化验结果相对偏差分别为3.29%、9.44%、6.56%,表明模型具有良好的可靠性。利用模型调整中和渣加入量,结果表明,中和渣的加入对氧气单耗基本没影响,随着中和渣加入量的增加,废酸单耗由4.47 m^(3)/t增加至4.61 m^(3)/t,Zn浸出率由80%降低至78.19%,Fe浸出率由15.38%降低至14.62%,中和渣的加入对锌浸出率有影响。
Based on Metcal methodology,the process model of zinc oxygen pressure leaching,leachate neutralization and iron removal was established to calculate the whole process material.The results show that when the zinc concentrate input is 25 t/h and the calcined ore addition is 2.69 t/h,the neutralization residue produced is about 1.04 t/h,containing 20.928%Zn,4.211%Pb and 34.919%Fe.After the neutralization slag returned to the first stage of the reactor,the oxygen required is 3588.98 m^(3)/h(standard state,the same below),and the oxygen utilization rate of the first stage of oxygen pressure is about 55%.The oxygen required by the second stage oxygen pressure leaching is 2141.24 m^(3)/h,and the oxygen utilization rate was 26.9%.During the iron removal stage,the oxygen utilization rate drops to 11.8%.A comparative analysis between the model calculations and onsite material assays shows that,the relative deviation of Zn,Pb,S and Fe in the first stage underflow sample is 4.96%,6.27%,7.59%and 5.51%,respectively.The relative deviation of Zn,Pb,S and Fe in the second stage underflow samples is 8.75%,0.73%,4.70%and 2.48%,respectively.The relative deviations of Zn,Pb and Fe in neutralization slag samples is 3.29%,9.44%and 6.56%,respectively,indicating that the model has good reliability.The model was used to adjust the return amount of neutralized slag.The results show that the amount of neutralized slag has no effect on the oxygen consumption per unit.However,with the increase of the amount of neutralized slag,the waste acid consumption rises from 4.47 m^(3)/t to 4.61 m^(3)/t,the leaching rate of Zn drops from 80%to 78.19%,and the leaching rate of Fe drops from 15.38%to 14.62%.The return amount of neutralizing slag has influence on zinc leaching rate.
作者
孔俊杰
李耀山
刘远
吴超
王铧泰
解万文
KONG Junjie;LI Yaoshan;LIU Yuan;WU Chao;WANG Huatai;XIE Wanwen(Qinghai Copper Co.,Ltd.,Xi'ning 810000,China;Western Mi ning Group Technology Development Co.,Ltd.,Xi'ning 810001,China;Key Laboratory of Plateau Mi neral Processing Engineering and Comprehensi ve Utilization of Qi nghai Province,Xi'ning 810001,China;Qinghai West Mi ning Rare P recious Metals Co.,Ltd.,Germo 816099,Qinghai,China)
出处
《有色金属(冶炼部分)》
北大核心
2025年第4期252-260,共9页
Nonferrous Metals(Extractive Metallurgy)
基金
青海省重大科技专项(2024-GX-A5)。
关键词
锌冶炼
模拟计算
Metcal
中和渣
zinc smelting
simulation calculations
Metcal
neutralization slag
