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- W2000561765 abstract "Up to now, most of arsenic sulphide residue can't be properly disposed. The traditional processes for treating arsenic sulphide residue have some widespread drawbacks such as the complex process, the high cost in operation, and the less than satisfactory removal effect and environmental protection. In view of this, a process of three-step vacuum separation was proposed for treating arsenic sulphide residue in this work. During vacuum separation, elemental sulphide and arsenic trioxide could be recovered effectively in primary distillation at temperature of 180 °C, distillation time of 2.0 h, corresponding to the residual gas pressure of 15 Pa. In secondary distillation, arsenic sulfide was obtained under the condition of 450 °C for 30 min, with a residual gas pressure of 15 Pa. When the temperature increased to 1000 °C for 2 h, lead sulfide was evaporated out in third distillation. Through the three-step vacuum separation, calcium fluoride was left behind in the third distilland, in which the content of arsenic was 5.65 × 10−4 wt.%. Correspondingly, the removal rate of arsenic was almost 100%. The vacuum process is expected to be effectively employed for recycling valuable components from arsenic sulphide residue, and meanwhile eliminating its pollution." @default.
- W2000561765 created "2016-06-24" @default.
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- W2000561765 date "2015-01-01" @default.
- W2000561765 modified "2023-10-17" @default.
- W2000561765 title "Three-step vacuum separation for treating arsenic sulphide residue" @default.
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- W2000561765 doi "https://doi.org/10.1016/j.vacuum.2014.09.018" @default.
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