| 摘要 |
<p>The disclosure describes a method of stripping ammonia from ammoniacal solutions, which are treated with milk of lime in a stripping column and from which ammonia is expelled with hot gas, vapour or an evaporating liquid whereas an effluent at the bottom of said column, containing lime sludge, calcium sulphate, unburnt hydroxide, calcium carbonate and other calcium compounds, is withdrawn from the column and conveyed to a separator in which sludge is separated from liquid. It is characterised in that a pumpable sludge is withdrawn from the separator and is burnt under reducing conditions in a combustion chamber under a supply of fuel gas and air at a temperature of 600 to 1200.degree.C.</p> |
