Electrochemical oxidation method and device for calcium sulfite in flue gas desulfurization ash

A calcium sulfite and oxidation device technology, applied in the direction of electrolysis, electrolysis components, cells, etc., can solve the problems of large fluctuations in composition and complex composition, and achieve the effects of improving service life, reducing corrosion, and promoting oxidation

Inactive Publication Date: 2018-06-05
安徽马钢嘉华新型建材有限公司
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Problems solved by technology

[0005] Aiming at the problem that the composition of the existing flue gas desulfurization ash is complex and the composition fluctuates greatly, it is difficult to effectively and quickly realize the oxidation of calcium sulfite in the flue gas desulfurization ash. Electrochemical oxidation method and device. In this method, the flue gas desulfurization ash and water are reconciled in proportion, and a direct current is passed through an inert electrode. Using an electrochemical method, a large number of highly active oxygen atoms will be generated near the electrode to quickly and effectively desulfurize the ash. Calcium sulfite is oxidized, and the oxidation efficiency and effect are improved; this method is simple to operate, realizes rapid oxidation, and is suitable for flue gas desulfurization ash with different compositions

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  • Electrochemical oxidation method and device for calcium sulfite in flue gas desulfurization ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The flue gas desulfurization ash comes from the sintering flue gas semi-dry method desulfurization ash of the iron and steel plant, and sampling is carried out, and the calcium sulfite in the desulfurization ash is measured by iodometric method to be 27.20wt%.

[0050] Weigh 5.0g of flue gas desulfurization ash and put it into electrolytic cell 5, add 250ml of water (the ratio of water to material is 50:1), stir with paddle 2 at a speed of 100rpm; submerge inert anode 1 and inert cathode 3 into the smoke In the gas desulfurization ash slurry 4, the paddle 2 is used to stir at a speed of 300rpm, and 1-3 drops of ammonia water are added dropwise. Through the buffering effect of ammonia water, the ionization continuously releases hydroxide ions, supplements the hydroxide ions near the anode and ensures The pH of the slurry does not change much during the reaction, and the ammonium ion produced by ionization has weak oxidation and will not react at the cathode. At the same t...

Embodiment 2

[0052] The flue gas desulfurization ash comes from the flue gas desulfurization ash of the sintering flue gas semi-dry process factory of the iron and steel plant. The sampling is carried out, and the calcium sulfite in the desulfurization ash is measured by the iodometric method to be 26.50wt%.

[0053] Weigh 6.25g of flue gas desulfurization ash and put it into the electrolytic cell 5, add 250ml of water (the ratio of water to material is 40:1), stir with paddle 2 at a speed of 200rpm; In the gas desulfurization ash slurry 4, the paddle 2 is used to stir at a speed of 200rpm; a direct current with a voltage of 25V is passed through, and the current density is 101.61A / m 2 After 30 minutes, the remaining calcium sulfite content in the system was measured to be 12.11wt%, and the oxidation efficiency of calcium sulfite in the flue gas desulfurization ash was 54.3%.

Embodiment 3

[0055] The flue gas desulfurization ash comes from the flue gas desulfurization ash of the sintering flue gas semi-dry process factory of the iron and steel plant, and is sampled, and the calcium sulfite in the desulfurization ash is measured by the iodometric method to be 20.35wt%.

[0056] Weigh 4.2g of flue gas desulfurization ash and put it into the electrolytic cell 5, add 250ml of water (the ratio of water to material is 60:1), stir with paddle 2 at a speed of 100rpm; submerge the inert anode 1 and inert cathode 3 In the gas desulfurization ash slurry 4, the paddle 2 is used to stir at a speed of 100rpm; a direct current with a voltage of 26V is passed through, and the current density is 103.69A / m 2 After 45 minutes, the remaining calcium sulfite content in the system was measured to be 5.66wt%, and the oxidation efficiency of calcium sulfite in the flue gas desulfurization ash was obtained to be 72.2%.

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Abstract

The invention discloses an electrochemical oxidation method and device for calcium sulfite in flue gas desulfurization ash and belongs to the technical field of material treatment. The method comprises the following steps: S101, weighing a certain amount of flue gas desulfurization ash to be added into an electrolytic cell, adding water, and stirring to form flue gas desulfurization ash slurry, wherein a ration of water to material in the flue gas desulfurization ash slurry is (10-100):1; S102, respectively inserting an inert anode and an inert cathode into the flue gas desulfurization ash slurry, connecting direct current, and controlling the current density to be 80-150A/m<2>; and S103, stirring while performing electrolysis on the flue gas desulfurization ash slurry, controlling the stirring time to be 15-60 minutes, and disconnecting the power supply after set control time is reached. According to the method disclosed by the invention, the flue gas desulfurization ash and the watercan be blended according to a certain ratio, the direct current is connected by virtue of inert electrodes, lots of high-active oxygen atoms are produced nearby the electrodes by utilizing an electrochemical method, the calcium sulfite in the flue gas desulfurization ash is rapidly and effectively oxidized, and the oxidation efficiency and effect are improved.

Description

technical field [0001] The invention belongs to the technical field of material processing, and more specifically relates to an electrochemical oxidation method and device for calcium sulfite in flue gas desulfurization ash. Background technique [0002] The semi-dry flue gas desulfurization technology has become the mainstream flue gas desulfurization process in the sintering process of iron and steel enterprises. However, this process will produce a certain amount of flue gas desulfurization ash as a by-product. Due to the extremely complex composition of semi-dry flue gas desulfurization ash, especially the unstable properties of calcium sulfite, if the desulfurization ash without oxidation catalytic modification is used to prepare various materials, its stability will be affected, so It is difficult to use. At present, the semi-dry desulfurization ash is mostly stacked and discarded, which not only occupies land resources, but also causes environmental pollution. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/18C25B9/00C25B15/02
CPCC25B1/18C25B9/00C25B15/02
Inventor 周浩峰李辽沙赵鲁卿龚国保武杏荣陶春智王亮倪冬梅
Owner 安徽马钢嘉华新型建材有限公司
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