| 摘要 |
<p>A continuous process for removing cyanogen compounds from a furnace gas containing them comprises cooling the gas by direct contact with a circulating water system until the circulating water has dissolved a sufficient quantity of the said cyanogen compound to provide a concentration of HCN in the water of 300-500 mg./litre and then branching off from the circulating water system a minor proportion of the said circulating water and decyanizing same, the water removed being replaced by a corresponding amount of fresh water. The water may be decyanized by heating to below its boiling point, e.g. 50-60 DEG C., and treating with a gas containing carbon dioxide. This water may be returned to the circulating system. The hydrogen cyanide may either be recovered or burnt in the furnace. The water to be decyanized may be mixed with HCN containing water derived from the filter dust and sludge, and the solids may be briquetted and returned to the furnace.ALSO:A continuous process for removing cyanogen compounds from a furnace gas containing them comprises cooling the gas by direct contact with a circulating water system until the circulating water has dissolved a sufficient quantity of the said cyanogen compound to provide a concentration of HCN in the water of 300-500 mg./litre and then branching off from the circulating water system a minor proportion of the said circulating water and decyanizing same, the water removed being replaced by a corresponding amount of fresh water. The water may be decyanized by heating to below its boiling point, e.g. 50-60 DEG C., and treating with a gas containing carbon dioxide. This water may be returned to the circulating system. The hydrogen cyanide may either be recovered or burnt in the furnace. The water to be decyanized may be mixed with HCN-containing water derived from the filter dust and sludge, and the solids may be briquetted and returned to the furnace.</p> |
