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<p>The cuprous thiocyanate-bearing acidification precipitates (CTAPs) are the precipitates obtained from the acidification pretreatment of cyanide wastewater by adjusting the pH to less than 2, which still are considered to be hazardous solid wastes. The roasting of CTAPs is carried out both in inert and oxidizing atmosphere in this study. The products are solid Cu<sub>2</sub>S and gaseous (CN)<sub>2</sub>, CS<sub>2</sub> and N<sub>2</sub> in inert atmosphere. The solid products are CuO, Cu<sub>2</sub>O(SO<sub>4</sub>) and CuSO<sub>4</sub> at 673&#xa0;K, CuO and Cu<sub>2</sub>O(SO<sub>4</sub>) at 873&#xa0;K, only CuO at 1073&#xa0;K, Cu<sub>2</sub>O and metal copper at 1273&#xa0;K, respectively, in oxidizing atmosphere. The initial gaseous products are still (CN)<sub>2</sub>, CS<sub>2</sub> and N<sub>2</sub>. And then CS<sub>2</sub> is oxidized to SO<sub>2</sub> and CO<sub>2</sub>. Most of (CN)<sub>2</sub> is oxidized to CO<sub>2</sub> and N<sub>2</sub>, and small amount of (CN)<sub>2</sub> is oxidized to CO<sub>2</sub> and NO firstly, and NO is oxidized to NO<sub>2</sub> subsequently. Both the mechanism conform to the random nucleation and nuclei growth for the non-isothermal roasting of CTAPs under inert and oxidizing atmosphere. The average activation energies are calculated to be 204.29 and 200.06&#xa0;kJ·mol<sup>− 1</sup>, respectively.</p>

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The roasting of cuprous thiocyanate-bearing acidification precipitates obtained from the acidification pretreatment of cyanide wastewater

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Peiwei Han,
  • Teng Zhang,
  • Jingmin Yan,
  • Shufeng Ye

摘要

The cuprous thiocyanate-bearing acidification precipitates (CTAPs) are the precipitates obtained from the acidification pretreatment of cyanide wastewater by adjusting the pH to less than 2, which still are considered to be hazardous solid wastes. The roasting of CTAPs is carried out both in inert and oxidizing atmosphere in this study. The products are solid Cu2S and gaseous (CN)2, CS2 and N2 in inert atmosphere. The solid products are CuO, Cu2O(SO4) and CuSO4 at 673 K, CuO and Cu2O(SO4) at 873 K, only CuO at 1073 K, Cu2O and metal copper at 1273 K, respectively, in oxidizing atmosphere. The initial gaseous products are still (CN)2, CS2 and N2. And then CS2 is oxidized to SO2 and CO2. Most of (CN)2 is oxidized to CO2 and N2, and small amount of (CN)2 is oxidized to CO2 and NO firstly, and NO is oxidized to NO2 subsequently. Both the mechanism conform to the random nucleation and nuclei growth for the non-isothermal roasting of CTAPs under inert and oxidizing atmosphere. The average activation energies are calculated to be 204.29 and 200.06 kJ·mol− 1, respectively.