Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings

A technology of sulfur dioxide and phosphorus tailings, applied in the direction of magnesium sulfate, chemical instruments and methods, separation methods, etc., can solve problems such as complex operation, high operating costs, and complicated process flow, and achieve high economic benefits, energy saving, and reduction of pollution effect

Active Publication Date: 2015-04-22
SINOCHEM AGRI LINYI R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional lye absorption method is: prepare high-concentration liquid caustic soda into a lower-concentration dilute lye suitable for absorption, and contact with smelting flue gas countercurrently to realize the absorption of sulfur dioxide in smelting flue gas by lye, when the absorption reaches the end (pH = 5 ~ 6), it is necessary to stop the absorption, discharge the saturated absorption liquid, and then re-prepare the lye and then recycle the absorption, the operating cost is high, the process is complicated, and the operation is complicated

Method used

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  • Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Use a thickener to thicken the flotation phosphorus tailings into a desulfurization slurry with a liquid-solid mass fraction ratio of 3:1. The main chemical components of the flotation phosphorus tailings are: calcium oxide 35%, magnesium oxide 10.3%, trioxide Fe 0.17% and Al 2 O 0.2% are pumped into the absorption section of the desulfurization tower with a centrifugal pump and the SO in the flue gas is mixed with a spray device. 2 Countercurrent contact mass transfer, reaction to generate magnesium sulfite and calcium sulfite, the desulfurized slurry after reaction is discharged to the oxidation circulation tank, and air is blown into the oxidation circulation tank with a blower at the same time, magnesium sulfite and calcium sulfite are in the tailings Fe 2 o 3 Under the action of catalysis, it is oxidized into magnesium sulfate and calcium sulfate solids. The temperature of the reaction in the oxidation circulation tank is controlled at 30°C and the pH is 4. At th...

Embodiment 2

[0024] Thicken the flotation phosphate tailings with a thickener to form a desulfurization slurry with a liquid-solid mass fraction ratio of 2:1. The main chemical components of the phosphate tailings are: 25% calcium oxide, 24% magnesium oxide, Iron 0.24%, aluminum oxide 0.06%. The absorption section of the desulfurization tower driven into the desulfurization tower by a centrifugal pump adopts a spray device to interact with the SO in the flue gas 2 Countercurrent contact mass transfer, reaction to generate magnesium sulfite and calcium sulfite, the desulfurized slurry after reaction is discharged to the oxidation circulation tank, and air is blown into the oxidation circulation tank with a blower at the same time, magnesium sulfite and calcium sulfite are in the tailings Fe 2 o 3 Under the action of catalysis, it is oxidized into magnesium sulfate and calcium sulfate solids. The temperature of the reaction in the oxidation circulation tank is controlled at 70°C and the pH...

Embodiment 3

[0026] Thicken the flotation phosphorus tailings with a thickener into a desulfurization slurry with a liquid-solid mass fraction ratio of 2.5:1. The main chemical components of the phosphorus tailings are: 40% calcium oxide, 12% magnesium oxide, Iron 0.12%, aluminum oxide 0.21%. The absorption section of the desulfurization tower driven into the desulfurization tower by a centrifugal pump adopts a spray device to interact with the SO in the flue gas 2 Countercurrent contact mass transfer, reaction to generate magnesium sulfite and calcium sulfite, the desulfurized slurry after reaction is discharged to the oxidation circulation tank, and air is blown into the oxidation circulation tank with a blower at the same time, magnesium sulfite and calcium sulfite are in the tailings Fe 2 o 3 Under the action of catalysis, it is oxidized into magnesium sulfate and calcium sulfate solids. The reaction temperature of the oxidation circulation tank is controlled at 50°C and the pH is 3....

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Abstract

A disclosed method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings is characterized by comprising: concentrating phosphorus floatation tailings slurry to obtain a desulfurized slurry with the liquid-solid mass ratio of 2-3:1; injecting the desulfurized slurry into a desulfurization tower, contacting with SO2 in flue gas for reaction, then sending to an oxidation circulation tank, supplementing air and oxidizing to obtain a solid precipitate; performing solid-liquid separation, and concentrating the separated magnesium sulfate solution to have a mass concentration of 30-40%; and cooling the magnesium sulfate solution, crystallizing, performing solid-liquid separation, and drying and dewatering the solid, so as to obtain magnesium sulfate monohydrate. The method for removing low-concentration sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings helps to remove sulfur dioxide in tail gas and reduce pollution of sulfur dioxide to environment, also is capable of cyclically utilizing phosphorus floatation tailings to produce a medium element magnesium sulfate fertilizer, fully utilizes afterheat of tail gas, saves energy, saves resource, reduces cost and is simple in operation.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a method for removing sulfur dioxide in flue gas by flotation phosphorus tailings and preparing magnesium sulfate. Background technique [0002] Sulfur dioxide in flue gas is extremely harmful to animals, plants and the ecological environment, and it has been difficult to effectively control it for a long time and has become a major problem. At present, more than 200 flue gas desulfurization technologies have been researched, developed and used in various countries, of which about 20 have been industrialized, mainly wet desulfurization, and the principle is mostly to absorb sulfur dioxide in flue gas by alkaline absorbents , such as lime / limestone / gypsum method, ammonia method, etc. [0003] The traditional lye absorption method is: prepare high-concentration liquid caustic soda into low-concentration dilute lye suitable for absorption, and contact w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40B01D53/80B01D53/50
CPCB01D53/507B01D53/80B01D2257/302C01F5/40
Inventor 谭伟盛勇刘萍韦莎郑开元周佩陈明凤江涛
Owner SINOCHEM AGRI LINYI R&D CENT CO LTD
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