Method for cleaning dust from the dry electrostatic precipitator in the pyro-metallurgical production process of zinc and lead

摘要

the subject invention is treatment dusts arising in the process pirometalurgicznym, for example in the imperial smelting process technology (isp) from fluorine and chlorine in order to don't them to production.treatment of dust is characterized by the fact that the process consists of three consecutive phases of technology, in which solution passing through successive blocks is subjected to the following technological operations. in the first phase u0142uguje to dust sulphuric acid to obtain suspension after u0142ugowaniu lightly acidic ph ", to conclude the chapter phases phase suspension.in this stage, followed by odfluorowanie and odchlorowanie dusts, and after chapter phases is a solid product, which it turns to technological process (isp technology) and solution, which is heading for a second block technology, which removes the filtrate with excess acid and the fluorine in the form of a mixture of plaster and calcium fluoride.adding this to the solution of hydrated lime for ph at 3.5 - 4. the process ends with chapter after chapter suspension phases, and phase is a solid product, which is a mixture of gypsum and calcium fluoride solution, which is to the third block technology in which the cadmium and zinc from solution in the form of carbonates.for this purpose the following sodium carbonate solution to ph at 6.8 - 8.0, resulting in a mixture of cadmium and zinc carbonate.the process ends the chapter phase dispersion, resulting in cadmium and zinc in the form of the recovered solid product in the form of carbonates to form carbonate cadmium and zinc, which again turns to technological process (isp technology) and the filtrate as a sewer.