摘要
针对高硅锌精矿焙烧过程中焙砂可溶硅高、沸腾炉易结块、浸出固液分离困难等问题,以现场生产焙烧工艺参数为基础,研究了低温和高温焙烧对焙砂中可溶硅含量的影响,并基于 MatCal软件对沸腾炉焙烧工艺进行热平衡计算.结果表明:在焙烧条件基本相同的情况下,随着硫化锌精矿焙烧温度的增加,焙砂中的可溶硅也增加.当焙砂中可溶硅高于 3.18％会出现浓密机上清液跑混、低浸浓密底流矿浆过滤困难、净液中除杂钴偏高等问题.经 MatCal模拟计算后,理论消耗空气 50 361.328 m3/h,低温焙烧的平均风量 47 102.8 m3/h,高温焙烧平均风量 48 005.7 m3/h,实际的焙烧中平均风量偏低,需要增加沸腾炉的风料比.
Abstract
Aiming at the problems of high soluble silicon in calcine,easy agglomeration in fluidized bed boilers and difficult solid-liquid separation in the roasting process of high silicon zinc concentrate.This paper is based on the on-site roasting production process parameters,the effects of low and high temperature roasting on the soluble silicon content in calcine are studied,and the roasting process of fluidized bed boilers is simulated using MatCal software.The results show that under the same roasting conditions,with the increase of roasting temperature,the acid soluble silicon in calcine increases,and the difference of 1.03%was obtained between low-temperature roasting and high-temperature roasting.When the soluble silicon content in calcine is above 3.18%,certain problems will appear,including turbidity of thickener supernatant,the difficult filtration for underflow pulp after low acid leaching,high cobalt content in the impurity removal of purified solution and so on.After MatCal simulation,the theoretical air consumption,the average air volume of low-temperature roasting and the average air volume of high-temperature roasting are 50 361.328 m3/h,47 102.8 m3/h,and 48 005.7 m3/h respectively.However,the average air volume in actual roasting is low,thus it is necessary to raise the air material ratio of the fluidized bed boilers.
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维普
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