Desulphurization method for sintering flue gas by using pyrolusite and rhodochrosite

A technology of sintering flue gas and rhodochrosite, which is applied in the field of flue gas desulfurization, can solve the problems of difficult desulfurization by-products, lack of flue gas desulfurization technology, high construction and operation costs of flue gas desulfurization equipment, and achieve increased equipment investment and stable desulfurization efficiency Effect

Inactive Publication Date: 2015-07-01
GUIZHOU UNIV
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Problems solved by technology

Most of these methods have high construction and operation costs of flue gas desulfurization equipment, and the low conten

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  • Desulphurization method for sintering flue gas by using pyrolusite and rhodochrosite

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[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings, but not as any limitation to the present invention.

[0015] A method of desulfurizing sintering flue gas by using pyrolusite and rhodochrosite, utilizing the reducing SO in sintering flue gas 2 and oxidizing MnO in poor pyrolusite 2 Oxidation-reduction reaction occurs in the manganese ore slurry, and the reduction reaction temperature is 80-120°C, and the SO in the sintering flue gas 2 Removal; crush pyrolusite and rhodochrosite into particles with a particle size of 0.075mm, add 5 times of clear water to the rhodochrosite and mix to make a manganese slurry with a pH value of 2.5 to 3.5, and the flue gas enters the absorption after dust removal The desulfurization and manganese leaching process is completed in the absorption tower; the desulfurization rate is greater than 92%, and the manganese leaching rate is more than 80%. The mother liquor is filtered, pu...

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Abstract

The invention discloses a desulphurization method for sintering flue gas by using pyrolusite and rhodochrosite. The method is characterized in that production of MnSO4 and SO2 exhaust gas treatment are combined, harmlessness, quantitative reduction and resource of SO2 are realized, and utilization market of the lean manganese ore is developed. An innovation is characterized in that rhodochrosite is taken as a pH value conditioning agent, problems that limewash taken as the conditioning agent can easily lead to obstruction of an absorption system pipeline and a circulating pump, and new impurity can be brought to a leachate, slag amount is increased, so that Mn<2+> loss is increased, and the problems of preparation complex of the pH value buffering agent, higher price than that of rhodochrosite and new impurity introducing in the system can be solved, limewash is not good for purifying pyrolusite desulphurization side effect, so that equipment investment for subsequent technology is increased, energy consumption and operation cost are increased. According to the invention, desulphurization efficiency can reach as stable as more than 92%, and the manganese leaching rate can reach more than 80%.

Description

technical field [0001] The invention relates to a method for sintering flue gas desulfurization by using pyrolusite and rhodochrosite, belonging to the technical field of flue gas desulfurization. Background technique [0002] Sintering flue gas is the dust-containing waste gas generated during the high-temperature sintering molding process after the sintering mixture is ignited in the iron and steel industry and runs with the trolley. The emission of sintering flue gas is large, about 4000-6000m3 per ton of sinter produced 3 smoke. The emission concentration of sulfur dioxide in the sintering flue gas is 400-3000mg / m 3 . If the sintering flue gas is discharged into the atmosphere without treatment, it will cause serious harm to the environment. Among them, sulfur dioxide will not only be fully utilized and reduce the comprehensive benefits of enterprises, but also cause acid rain and affect air quality and many other problems. Desulfurization of sintering flue gas is an...

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Application Information

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IPC IPC(8): B01D53/80B01D53/50C01G45/10
Inventor 吴复忠李军旗金会心王文豪李水娥
Owner GUIZHOU UNIV
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