Silicon Control and Heat Balance Calculation in Roasting Process of High Silicon Zinc Sulfide Concentrate
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.
zinc sulfide concentratefluidized bed boilersroastingheat balance
NETL
NSTL
万方数据
维普
