Desulfurization and sulfur recovery method for sulfur dioxide flue gas
AssigneeTongLing Nonferrous Metals Group Holdings Co. Ltd.
InventorJun Zhou
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Abstract
The present disclosure provides a desulfurization and sulfur recovery method for sulfur dioxide flue gas, and belongs to the technical field of non-ferrous metal smelting. The method includes the following steps: desulfurizing the sulfur dioxide flue gas by taking slagging flux limestone or quicklime for smelting or converting process as a desulfurizer, and adsorbing SO2 in the gas to obtain gypsum residue, calcium sulfite, and the desulfurized flue gas, where SO2 in the sulfur dioxide flue gas before desulfurization is less than 1 vol %; and recycling the gypsum residue and the calcium sulfite to the smelting or converting furnace for slagging, resolving the SO2 into smelting off-gas, producing sulfuric acid in acid plant.
Claims8
A desulfurization and sulfur recovery method for sulfur dioxide flue gas, comprising the following steps:
- desulfurizing the sulfur dioxide flue gas by taking part or all of slagging flux of a smelting process, using limestone or quicklime as a desulfurizer, chemically absorbing SO2 in the sulfur dioxide flue gas to obtain gypsum residue, calcium sulfite, and desulfurized flue gas, wherein SO2 in the sulfur dioxide flue gas before desulfurization is less than 1 vol %, and recycling the gypsum residue and calcium sulfite to a smelting furnace for slagging, and resolving the SO2 into off-gases to produce sulfuric acid in an acid plant,
- wherein a process of recycling the gypsum residue and the calcium sulfite to the smelting furnace for slagging and resolving SO2 into the off-gases to produce sulfuric acid comprises the following steps:
- grinding and making slurry of the slagging flux in sequence to get desulfurization slurry;
- desulfurizing the sulfur dioxide flue gas with the desulfurization slurry to get the desulfurized flue gas and gypsum slurry;
- conducting liquid-solid separation on the gypsum slurry to get the gypsum residue and the calcium sulfite;
- and
- blending the gypsum residue and the calcium sulfite with silica and copper concentrate, feeding a resulting mixture to the smelting furnace, and resolving SO2 into smelting off-gases to produce the sulfuric acid in the acid plant.
A desulfurization and sulfur recovery method for sulfur dioxide flue gas, comprising the following steps:
- desulfurizing the sulfur dioxide flue gas by taking part or all of slagging flux of a converting process, using limestone or quicklime as a desulfurizer, chemically absorbing SO2 in the sulfur dioxide flue gas to obtain gypsum residue, calcium sulfite, and desulfurized flue gas, wherein SO2 in the sulfur dioxide flue gas before desulfurization is less than 1 vol %;
- and recycling the gypsum residue and the calcium sulfite to a converting furnace for slagging, and resolving SO2 into off-gases to produce sulfuric acid in an acid plant,
- wherein a process of recycling the gypsum residue and the calcium sulfite to the converting furnace for slagging and resolving SO2 into the off-gases to produce sulfuric acid comprises the following steps:
- grinding and making slurry of the slagging flux in sequence to get desulfurization slurry;
- desulfurizing the sulfur dioxide flue gas with the desulfurization slurry to get the desulfurized flue gas and gypsum slurry;
- conducting liquid-solid separation on the gypsum slurry to get the gypsum residue and the calcium sulfite;
- and
- under a condition that the converting process is a flash converting process, blending the gypsum residue, the calcium sulfite and matte, feeding a resulting mixture to a flash converting furnace, resolving SO2 into converting off-gases, to produce sulfuric acid in the acid plant, wherein in flash converting operation, the limestone or the quicklime is further fed to the flash converting furnace;
- and
- under a condition that the converting process is a bath converting process, while feeding matte to a bath converting furnace, blending the gypsum residue, the calcium sulfite with the limestone or the quicklime, recycling to the bath converting furnace for slagging, and resolving SO2 into converting off-gases to produce sulfuric acid in the acid plant.
Dependencies are inferred from the claim text.