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在有色冶炼厂中的烟道气及一些废气中含有二氧化硫,这样的气体一般都用来制造硫酸。但这些气体中都含有汞,如某冶炼厂,其烧结机烟气含汞为20～40毫克/米~3;其硫酸中含汞为100～200毫克/升,有的高达300毫克/升,这种硫酸不能用来制药、制造化肥及其它化工产品。所以含汞的二氧化硫烟气必须事先除汞。“碘络合法除去含二氧化硫烟气中的汞”是我院提出的一项新工艺,已于八一年在某厂投产,每月可从烟气中回收二吨金属汞。该法是用碘化钾吸收汞,将含汞的二氧化硫气体,通过一个用碘化钾淋洗的吸收塔,汞被碘化钾溶液吸收形成四碘化汞钾络合物,而二氧化硫几乎不损失,不影响制酸。除汞效果
Sulfur dioxide is contained in the flue gas and some of the exhaust gases in non-ferrous smelters, and such gases are generally used to make sulfuric acid. However, these gases contain mercury, such as a smelter, the sintering machine flue gas mercury content of 20 to 40 mg / m ~ 3; sulfuric acid containing mercury in 100 ~ 200 mg / l, and some as high as 300 mg / l This sulfuric acid can not be used for pharmaceuticals, fertilizer and other chemical products. Therefore, mercury-containing sulfur dioxide flue gas must be in advance of mercury. “Iodine Complex Removal of Mercury in Sulfur Dioxide Flue Gas” is a new process proposed by our institute. It was put into operation in a factory in 1981 and can recover two tons of metallic mercury from flue gas each month. The method is to absorb mercury with potassium iodide, the mercury-containing sulfur dioxide gas through an absorption tower rinsed with potassium iodide, potassium iodide solution was absorbed by the formation of potassium iodide potassium mercury complexes, and sulfur dioxide is almost no loss, does not affect the acid . Mercury removal effect