Method for treating fluorine and chlorine-containing waste gas

Abstract

The invention discloses a method for treating fluorine and chlorine-containing waste gas, which comprises the following steps: step 1, preparing a saturated or near-saturated calcium chloride solutionby using solid calcium chloride as a raw material; step 2, introducing the fluorine and chlorine-containing waste gas to react with calcium chloride in the solution to obtain a calcium fluoride-containing precipitate and a hydrogen chloride-containing gas; step 3, collecting and treating the obtained calcium fluoride-containing precipitate to manufacture glass; 4, introducing wet hydrogen chloride-containing gas into a reactor filled with lime to obtain a calcium chloride mixture; and step 5, returning the obtained calcium chloride mixture to the initial stage of the process, and continuouslytreating the fluorine and chlorine-containing waste gas. Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that the adopted raw materials are easyto obtain and proper in price, so that the waste gas treatment cost is reduced; compared with the prior art, the fluorine and chlorine-containing waste gas treatment process has the advantages that the process is relatively simple, resources are saved, and the industrial production cost is reduced.

Description

technical field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a method for treating waste gas containing fluorine and chlorine. Background technique

[0002] The waste gas containing fluorine and chlorine mainly comes from the fluorine chemical industry. The fluorine chemical industry will produce a large amount of waste gas containing fluorine and chlorine, which is mixed with various dusts. Fluorine-containing chlorine waste gas is a kind of highly toxic gas, which is highly harmful and irritates the eyes, nose, throat and respiratory tract of people. When the concentration is high, it will cause bronchospasm, organ ulcerative inflammation, acute pulmonary edema, etc. Concentrations can cause poisoning death. Some of the current treatment methods for waste gas containing fluorine and chlorine are mainly based on absorbing fluorine and chlorine in the waste gas, without creating more value. If the waste gas containing fluori...