Phosphate ore-phosphoric acid-gypsum process flue gas desulphurization system and process

Abstract

The invention discloses a phosphate ore-phosphoric acid-gypsum process flue gas desulphurization system and process. Phosphate ore is crushed and ground into powder, and phosphoric ore pulp is prepared by means of a phosphate ore slurry box and is continuously conveyed and supplemented into a desulfurizing absorption tower; boiler smoke output from a boiler dust remover enters the desulfurizing absorption tower through an outlet pipeline of an induced draft fan and makes countercurrent contact with the phosphoric ore pulp from the desulfurizing absorption tower for a desulfurizing absorption reaction; desulfurized tail gas passes through a demister of the desulfurizing absorption tower, and carried liquid drops are removed; the tail gas from the top of the desulfurizing absorption tower enters a defluorination absorption tower and makes contact with a fluorine circulating liquid, a washing absorption liquid is sent by a defluorination absorption liquid tower to a belt-type vacuum filtering machine to serve as ardealite washing water and then conveyed to the desulfurizing absorption tower through a diluted phosphoric acid pump to be recycled; washed desulfurization and defluorination purified smoke passes through a cyclone demister and is discharged to the air through a chimney. The phosphate ore-phosphoric acid-gypsum process flue gas desulphurization system and process have the characteristics of meeting circular economy, resource utilization and sustainable development.

Description

technical field [0001] The invention relates to the technical fields of calcium method flue gas desulfurization technology and wet phosphoric acid technology, in particular to a phosphate rock-phosphoric acid-gypsum method flue gas desulfurization system and its technology. Background technique [0002] At present, domestic calcium desulfurization devices occupy half of the country, mainly using limestone and lime as desulfurizers to remove SO from flue gas 2 gas, the by-product of which is sulfur gypsum. In fact, sulfur gypsum is industrial waste residue, the main component is calcium sulfate dihydrate (CaSO 4 2H 2 O), only used in the construction industry as cement additives and gypsum products; especially the sulfur resource therein has no value of recycling in industrial production. Therefore, the existing calcium desulfurization technology turns waste gas into waste residue, which does not conform to the strategy of circular economy, resource utilization and sustain...

AI Technical Summary

Problems solved by technology

Therefore, the existing calcium desulfurization technology turns waste gas into waste residue, which does not conform to the strategy of circular economy, resource utilization and sustainable development, and will be restricted and eliminated sooner or later.

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