A kind of process method for clean disposal of high arsenic hazardous waste
A technology of hazardous waste and process method, which is applied in the direction of arsenic compounds, chemical instruments and methods, sulfur preparation/purification, etc. It can solve the problems of high risk of secondary pollution, large amount of waste gas and waste water, poor adaptability of raw materials, etc., and improve the utilization of equipment High efficiency, reduced energy consumption, rapid heating effect
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Embodiment 1
[0062] The soot is disposed of by the process of the present invention, specifically: the temporary storage section and the heating section of the distillation furnace are fed with hot nitrogen to raise the temperature of the material in the furnace to 280°C, and the As in the material 2 O 3 Sublimation; then heating the materials in the temporary storage section and heating section to 350 °C by nitrogen heating, so that arsenide and high-valent arsenic oxide are reduced to metallic arsenic; It is oxidized to arsenic trioxide and sublimated at 350℃; the crude arsenic trioxide is obtained by condensation and recovery.
[0063] The yield of distillation slag is 52.80%, arsenic 4.04% (calculated as arsenic), sulfur 0.26%, copper 6.12%, lead 20.68%, zinc 4.75%, bismuth 2.95%. In the crude arsenic trioxide, the volatilization rate of arsenic was 94.29% (calculated as arsenic), and copper, lead, zinc and bismuth were not lost.
Embodiment 2
[0065] The black copper powder is treated by the process of the present invention, specifically: reducing arsenide, arsenate, etc. to elemental arsenic under the low temperature condition of 350 °C; Arsenic is oxidized to As at 300-400℃ 2 O 3 Sublimation; condensation recovery to obtain crude arsenic trioxide.
[0066] The yield of distillation slag was 61.15%, arsenic was 1.86% (calculated as arsenic), and copper was 65.81%. In the crude arsenic trioxide, the volatilization rate of arsenic is 94.98% (calculated as arsenic), and copper, lead, zinc and bismuth are not lost.
Embodiment 3
[0068] Arsenic sulfide is disposed of by the process of the present invention, specifically: the raw materials are first slurried with water, and CaCO is slowly added. 3 Neutralize the powder to pH=4.5, then slowly add lime milk to neutralize to pH=7.0, then add the required amount of sodium carbonate and carbon powder, filter, dry and sieve to obtain the material, thus avoiding the distillation process generate a lot of SO 3 , in addition, the filtrate of the pressure filtration can be recycled; hot nitrogen gas is introduced into the distillation furnace to raise the temperature of the material in the furnace to 280 ° C, so that the arsenic in arsenic sulfide is reduced to elemental substance; after the reduction, the temperature is heated to 350 ° C by hot nitrogen gas , the incoming nitrogen is filled with an appropriate amount of oxygen, so that the metal arsenic is oxidized into arsenic trioxide sublimation at 350 ℃; the crude arsenic trioxide is recovered by condensatio...
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