| 摘要 |
<p>PURPOSE:To reduce contents of Glauber's salt, moisture and fine powder, improve fluidity and prevent solidification by reducing mother liquor concentration after depositing crystal, simultaneously drying deposited and separated Na2SO3 with hot air and directly cooling the dried Na2SO3 in dry air. CONSTITUTION:A waste gas containing sulfurous acid gas is brought into contact with a solution containing NaOH and/or Na2SO3 to provide a solution containing acidic Na2SO3 and neutral Na2SO3 in high concentrations. The resultant concentrated solution is then led to a crystallizer and NaOH is added to deposit anhydrous Na2SO3 and regulate the mother liquor concentration after depositing the crystals to <=1220g/l. The deposited Na2SO3 is subsequently centrifuged, dried with hot air, directly fluidized in dry air below ambient temperature and cooled to <=30 deg.C.</p> |
