Method suitable for utilization of resource of sintering flue gas desulphurization waste solution

Abstract

The invention relates to a method suitable for utilization of resource of sintering flue gas desulphurization waste solution, belonging to the technology of utilizing resource of desulphurization waste solution for atmospheric pollution control in the environmental protection field. Desulphurization waste solution is delivered into a vortex separator (2) through an ammonium sulphate slurry pump (1) and a pipeline system so that solid and liquid are partially separated; low-concentration ammonium sulphate solution at the upper part of the vortex separator (2) is delivered into an ammonium sulphate feed liquid pot (9) through a pipeline, and high-concentration ammonium sulphate solution at the lower part of the vortex separator (2) is delivered into a thickener (3) through a pipeline; thickened high-solid ammonium sulphate solution enters a centrifuger (4) through an overflow pipeline arranged at the bottom of the thickener (3); ammonium sulphate granules with the water content of less than 5 percent is obtained, and ammonium sulphate mother solution enters the ammonium sulphate feed liquid pot (9); the ammonium sulphate granules enter a drier (5) and are dried by the drier (5), and ammonium sulphate granules with the water content of less than 1 percent are obtained; feed liquid in the ammonium sulphate feed liquid pot (9) is low-concentration ammonium sulphate slurry which returns to a desulphurization system through a feed liquid output pump (11) and reenters a dehydrating system so that high-concentration ammonium sulphate granules are prepared.

Description

technical field [0001] The invention relates to a resource utilization technology of air pollution control desulfurization waste liquid in the field of environmental protection, in particular to a process for treating sintering flue gas ammonia desulfurization waste liquid in the iron and steel industry. Background technique [0002] Analysis of the advantages and disadvantages of the existing similar technology waste liquid treatment process: [0003] 1. Limestone-gypsum wet desulfurization [0004] Use limestone slurry as desulfurizer to remove SO 2 Calcium sulfite-containing waste liquid is generated, and the generated calcium sulfite is oxidized into calcium sulfate by compressed air in the slurry tank to form the final product gypsum. This method is currently widely used in power plant flue gas desulfurization. [0005] There are following defects in this method: [0006] 1) Due to the abundance of gypsum resources in my country, the gypsum produced by desulfurizatio...

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Problems solved by technology

[0013] Technical problem: In view of the low utilization rate of desulfurization products in operation, the need for a large number of sites to be stacked, and the easy occurrence of secondary pollution in the above technologies, the present invention proposes a method suitable for resource utilization of sintering flue gas desulfurization waste liquid. The desulfurization waste liquid of iron and steel enterprises mainly contains ammonium sulfite (hydrogen) ammonium, etc., and the ammonium sulfate fertilizer is produced through the ammonium sulfate fertilizer production process. , and can also achieve the purpose of "turning waste into treasure"

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