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Removal method for impurity ions in organic amine desulfurized solution

A technology for desulfurization solution and impurity ions, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of poor removal of impurity ions and other problems, so as to save desulfurization operation costs, reduce sintering water, and reduce regeneration. The effect of energy consumption

Inactive Publication Date: 2018-04-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

[0003] Aiming at the shortcomings of the existing sintering flue gas, especially the organic amine desulfurization process, the removal effect of impurity ions in the desulfurization solution is not good, the invention provides a method for removing impurity ions in the organic amine desulfurization solution

Method used

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Embodiment

[0023] Desulfurization solution absorbs SO 2 Afterwards, the high head part flows into the activated carbon adsorption tank, and is pumped into the bottom of the cation resin exchange column. After purification, the solution flows out from the upper part, merges into the rich liquid and enters the regeneration tower, and is desorbed by steam. 2 Then it turns into lean liquid, after heat exchange by heat exchanger, the separated part enters the anion resin exchange column, and the effluent is transported to the freezing and crystallization system by pump, and returns to the desulfurization system after removing impurities. Among them, the cation resin exchange column is used to treat the solution from the bottom to the top, and the processing capacity is 20-25m 3 / h, time 45min, after adsorption, the resin is washed with 2m3 soft water, and the acid gas condensate in the regeneration tower is regenerated, and its flow rate is 12-15m 3 / h, the time is 6min, and finally emptied;...

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Abstract

The invention belongs to the field of chemical industry, and specifically relates to a removal method for impurity ions in an organic amine desulfurized solution. The invention is to solve a technicalproblem of providing the removal method for the impurity ions in the organic amine desulfurized solution. The removal method comprises the following steps: allowing an organic amine desulfurized richliquor to pass through a cation resin exchange column of chelated resin so as to adsorb Fe3+ and Cu2+ ions, allowing the obtained organic amine desulfurized rich liquor to enter a regeneration tower,carrying out SO2 regeneration so as to obtain a poor liquor, allowing the poor liquor to pass through an anionic resin exchange column of macroporous weakly basic resin so as to remove Cl-, and allowing the obtained poor liquor to enter a freezing crystallization system so as to remove SO4<2->. The method provided by the invention can purify a used organic amine desulfurizer, reduces poisoning ofthe desulfurizer, stabilizes the effect of desulfurization, reduces the operation cost of desulfurization, and guarantees normal and stable operation of a desulfurization system.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for removing impurity ions in an organic amine desulfurization solution. The invention relates to the technical field of purification of desulfurization solution in a wet flue gas desulfurization system. Background technique [0002] Panzhihua Iron and Steel No. 3 sintering flue gas desulfurization adopts organic amine technology. During the operation of the desulfurization system, the pH value of the desulfurization lean liquid is controlled at 5.0-5.5 to absorb SO 2 The pH of the post-rich solution is controlled at 4.0 to 4.5. Due to the cyclic absorption and desorption of the desulfurizer, the Fe contained in the dust in the flue gas 2+ 、Cu 2+ , Cl - and SO 2 Oxidation, entering the desulfurization solution makes the concentration of metal ions and acid ions increase cumulatively, among which Fe 3+ 、Cu 2+ will make the desulfurizer invalid, Cl - lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/50
CPCB01D53/50B01D53/96
Inventor 张小龙黎建明邱正秋王建山
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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