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Slag desulfurization method and its application in the production of slag powder

A technology of slag and sulfur content, which is applied in the field of slag desulfurization and production of slag powder, which can solve the problems of cumbersome process and unfavorable environmental protection, and achieve the effect of simple and efficient method, one-line completion and high-efficiency desulfurization

Active Publication Date: 2020-11-27
山东永正水泥有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the desulfurization method is mainly through the limestone / lime-gypsum flue gas desulfurization process, and the calcium sulfite and calcium sulfate generated after absorbing sulfur dioxide by calcium-based desulfurizers are used to generate waste. The above desulfurization process requires an additional desulfurization process , and additional calcium element needs to be added in the desulfurization process, and additional waste will be generated, the process is cumbersome and not conducive to environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0042] As an embodiment, the slag desulfurization method comprises steps:

[0043] drying, separating the slag into solids and flue gas;

[0044] Pass the solid matter into a vertical mill for grinding, and at the same time pass the flue gas into the ground solid matter, and use the calcium element in the solid matter to react with the sulfur element in the flue gas to perform a primary Desulfurization;

[0045] After grinding, the specific surface area of ​​the solid is not less than 415m 2 / kg;

[0046] The grinding temperature is 210°C;

[0047] The temperature of the flue gas is 300°C.

[0048] As an embodiment, after drying, the fineness of the solid matter separated from the slag does not exceed 1.0% through a 45 μm sieve.

[0049] As an implementation, the pressure difference in the vertical mill is 2830Pa.

[0050] As an embodiment, the slag desulfurization method comprises steps:

[0051] drying, separating the slag into solids and flue gas;

[0052] Pass the ...

Embodiment 1

[0057] The desulfurization of embodiment 1 slag

[0058] The composition of the slag is as follows:

[0059] LOSS (loss on ignition): -1.03%;

[0060] Fe 2 o 3 : 0.54%;

[0061] al 2 o 3: 15.15;

[0062] CaO: 40.68%;

[0063] MgO: 7.00%;

[0064] SiO 2 : 31.79%;

[0065] SO 3 : 1.30%.

[0066] Dry the slag to form solid matter and flue gas; pass the solid matter into the vertical mill for grinding, and at the same time pass high-temperature flue gas into the ground solid matter, and use the calcium element in the solid matter to react with the sulfur element in the flue gas , for desulfurization; the flue gas after desulfurization can be partially recycled back to the vertical mill, or all of it can be recycled back to the vertical mill.

[0067] Among them, the pressure difference in the vertical mill is 2830Pa, and the grinding temperature is 210°C; after grinding, the fineness of the solid is 1.0% of a 45μm sieve, and the specific surface area is 415m 2 / kg, t...

Embodiment 2

[0070] The desulfurization of embodiment 2 slag

[0071] The desulfurization method in this embodiment is roughly the same as that in Embodiment 1, the difference is that, after the primary desulfurization is performed in the vertical mill, a step of passing the primary desulfurized flue gas through a dust collector for secondary desulfurization is also included. The high-temperature flue gas after secondary desulfurization can be partially recycled back to the vertical mill, or all of it can be recycled back to the vertical mill.

[0072] in:

[0073] The cloth bag of the dust collector is an acrylic cloth bag, the size of the cloth bag is Φ130×3100mm, the number of cloth bags is 2860, and the total length of the cloth bag is 8866m.

[0074] The desulfurized high-temperature flue gas is converted into low-temperature flue gas through heat recovery. In terms of sulfur dioxide content, the sulfur content in the low-temperature flue gas can reach zero, which is far below the na...

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Abstract

The invention relates to a slag desulfurization method and applications in production of slag powder. The slag desulfurization method comprises: drying to separate slag into a solid matter and flue gas; and introducing the solid matter into a vertical mill, grinding, simultaneously introducing the flue gas into the grinded solid matter, and carrying out first-stage desulfurization by using the reaction between the calcium in the solid matter and the sulfur in the flue gas, wherein the specific surface area of the solid matter is not less than 415 m<2> / kg after the grinding, the grinding temperature is 200-230 DEG C, and the temperature of the flue gas is 250-350 DEG C. According to the present invention, with the method, the curing is performed by utilizing the calcium and the sulfur contained in the slag, such that the additional use of the desulfurization process and the waste generation are avoided, the method is simple and efficient, and the sulfur dioxide contained in the flue gas after the desulfurization is far lower than the national emission standard, and can be directly discharged.

Description

technical field [0001] The invention relates to the field of slag, in particular to a slag desulfurization method and its application in the production of slag powder. Background technique [0002] Slag is generally the waste slag produced by the iron and steel industry. This kind of solid waste slag has a huge stockpile and annual discharge, and its recycling becomes inevitable. For example, slag is produced into slag powder, which is then further recycled for construction materials, such as cement, bricks, and roadbed materials. Wait. However, there is a non-negligible content of sulfur element in this kind of solid waste residue. In the process of producing it into slag powder, sulfur element will leave the solid slag in the form of gas. If it enters the atmosphere directly, it will bring very serious environmental problems. . Therefore, slag desulfurization is very necessary. [0003] In the prior art, the desulfurization method is mainly through the limestone / lime-gy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04C04B20/02C04B18/14
CPCC04B18/142C04B20/02C04B20/026C04B20/04Y02W30/91
Inventor 窦霆张青青
Owner 山东永正水泥有限公司
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