| 摘要 |
<p>A low pollution process for extracting arsenic in vacuum, including: heat and keep the smelting chamber to a temperature of 100-300 °C under the reduced pressure lower than 50 Pa to remove the water vapor and some dust; then heat and keep the temperature of the melting chamber and condensing chamber to 300-500 °C to remove volatile arsenic sulfide; maintain the condensing chamber temperature while heating and keeping the temperature of the smelting chamber to 500-600 °C to remove the decomposed gas sulfur; heat the smelting chamber to 600-700 °C but reduce the temperature of condensing chamber to 270-370 °C and keep them still to obtain arsenic; now stop heating and introduce gas, take off arsenic and discharge the slag. The present invention also provides an equipment for carrying out the said process which comprises a heating device, a smelting device, a temperature-keeping condenser, a liquid-pressure driven discharging device, a dust collector, an automatic temperature-controlling device, a vacuum measure device and a vacuum pump. The present invention reduces arsenic pollution and solves the long-term problem for safe-production, it also simplifies the applied process.</p> |
