A method for purifying ammonium sulfate mother liquor produced by sintering flue gas ammonia desulfurization process

A technology for ammonium sulfate mother liquor and ammonia desulfurization, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc. Long precipitation time and other problems, to achieve the effect of easy promotion, low cost and good purification effect

Inactive Publication Date: 2015-09-16
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the ammonia desulfurization system, the fly ash brought by the flue gas can easily enter the system to form ash. If the ash cannot be discharged in time, it will form enrichment, which will affect the quality of ammonium sulfate and the system. stable operation of
According to the characteristics of the sintering flue gas ammonia desulfurization system, most sintering plants adopt the precipitation process for the treatment of the ash in the ammonium sulfate mother liquor. The requirements required by the filter, and then achieve the purpose of removing it through filtration

Method used

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  • A method for purifying ammonium sulfate mother liquor produced by sintering flue gas ammonia desulfurization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 10 cubic meters of original ammonium sulfate mother liquor produced by the ammonia desulfurization process in the coagulation reaction tank, heat up to 40 ° C, add 10 kg of polyaluminium chloride while stirring, and stir for 10 minutes at a stirring speed of 150 rpm. Then add the sulfite amide of 10kg, then stir for 20 minutes at a stirring speed of 60 rpm, stop stirring;

[0019] Then transfer to the precipitation concentration tank and let it stand for 2 hours. After fully stratified, the supernatant liquid, that is, the treated ammonium sulfate mother liquor, is collected in the collection tank, and the lower sediment is transferred to the plate and frame filter press. The filter press is used to filter, and the filtrate produced by the filtration, that is, the treated ammonium sulfate mother liquor, is collected into the collection pool, and the filtered filter residue is transported out through the sludge transport system. The treated ammonium sulfate mother li...

Embodiment 2

[0027] Add 10 cubic meters of original ammonium sulfate mother liquor (the same batch as the thiamine mother liquor used in the embodiment) produced by the ammonia desulfurization process in the coagulation reaction tank, and add 20kg of polymerized chlorine while stirring under room temperature conditions. Aluminum, stir to disperse, then add 10kg of activated silicic acid, stir to disperse, stop stirring;

[0028] Then transfer to the precipitation concentration tank and let it stand for 1 hour. After the system is fully stratified, the supernatant, that is, the treated ammonium sulfate mother liquor, is collected in the collection tank, and the lower sediment is transferred to the plate and frame filter press. The frame filter press is used for filtration, and the filtrate produced by the filtration, that is, the treated ammonium sulfate mother liquor, is collected into the collection pool, and the filtered residue is transported through the sludge transport system. The tre...

Embodiment 3

[0036] Add 10 cubic meters of original ammonium sulfate mother liquor in the coagulation reaction tank, add 15 kg of polyaluminum sulfate while stirring at 15 ° C, stir for 10 minutes at a stirring speed of 150 rpm, then add 15 kg of sodium alginate, and then Stir for 20 minutes at a stirring speed of 60 rpm, then stop stirring;

[0037] Then transfer to the precipitation concentration tank and let it stand for 0.5 hours. After the system is fully layered, the supernatant, that is, the treated ammonium sulfate mother liquor, is collected in the collection tank, and the lower sediment is transferred to the plate and frame filter press. The filter press is used to filter, and the filtrate produced by the filtration, that is, the treated ammonium sulfate mother liquor, is collected into the collection pool, and the filtered filter residue is transported out through the sludge transport system. The treated ammonium sulfate mother liquor in the collection pool can be transferred to...

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Abstract

The invention relates to a method for purifying ammonium sulfate mother liquor produced from sintering flue gas through an ammonia method desulfurization process. The method is characterized by comprising the following steps: adding an inorganic high-polymer flocculant polyaluminium chloride or polyaluminum sulfate into the ammonium sulfate mother liquor at 10-45 DEG C, stirring, dispersing, then adding a high-polymer coagulant aid for improving the structure of the flocculant, stirring, dispersing, further standing, fully precipitating, collecting the supernatant (namely the treated ammonium sulfate mother liquor), then performing pressure filtration on the lower-layer precipitate by using a plate-frame type pressure filter, collecting the filtrate (namely the treated ammonium sulfate mother liquor) obtained by pressure filtration, and merging with the collected supernatant. The process is simple, and the purification effect is good; the treated ammonium sulfate mother liquor system has no residues of the flocculant and the coagulant aid basically, and when the ammonium sulfate mother liquor system is returned into a desulfurizing tower for repeated use, adverse effects on the process in the desulfurizing tower can be avoided; and the cost is low, and the popularization is convenient to realize.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to a method for purifying ammonium sulfate mother liquor produced in a sintering flue gas ammonia desulfurization process. Background technique [0002] At present, the main treatment methods for sintering flue gas in the world can be divided into three types: wet method, semi-dry method and dry method according to the process characteristics. The wet method desulfurization technology includes: lime-gypsum method, ammonia-ammonium sulfate method, Mg(OH) 2 method, seawater method, double alkali method, steel slag gypsum method, organic amine method, ionic liquid circulation absorption method, etc.; semi-dry desulfurization technology: dense phase tower method, circulating fluidized bed method, MEROS method, NID method, ENS method, LEC method, electron beam irradiation method (EBA), spray drying method, etc.; dry desulfurization technology includes: activated carbon method, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/01B01D53/79B01D53/50
Inventor 肖扬龚晚君王光辉曾丹林田永胜高芳孙庆星蒋国波杨慧汤静芳
Owner 武汉钢铁有限公司
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