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Method for modifying desulfuration ash for cement retarder

A technology of cement retarder and desulfurization ash, applied in the field of cement retarder, can solve the problems that desulfurization ash cannot be directly used as cement retarder and environmental pollution, so as to improve oxidation efficiency, shorten reaction time and solve environmental problems Effect

Inactive Publication Date: 2011-04-13
中钢集团武汉安全环保研究院有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that desulfurization ash cannot be directly used as a cement retarder at present, and to provide a method for modifying desulfurization ash, so that desulfurization ash can be used as a cement retarder, and avoid the environment caused by a large amount of desulfurization ash. Pollution

Method used

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  • Method for modifying desulfuration ash for cement retarder

Examples

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Effect test

Embodiment 1

[0014] Take 1 kg of desulfurized ash, and ball mill it for 30 minutes to obtain a crushed desulfurized ash with a specific surface area of ​​650m2 / kg, and then treat it at 500°C for 30 minutes, and the oxidation rate of calcium sulfite is 98.6%.

Embodiment 2

[0016] Take 1 kg of desulfurized ash, and ball mill it for 40 minutes to obtain a specific surface area of ​​690m2 / kg, and then treat it at 480°C for 30 minutes, and the oxidation rate of calcium sulfite is 98.8%.

Embodiment 3

[0018] Take 1 kg of desulfurized ash, and ball mill it for 25 minutes to obtain a crushed desulfurized ash with a specific surface area of ​​620m2 / kg, and then treat it at 550°C for 30 minutes, and the oxidation rate of calcium sulfite is 97.9%.

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Abstract

The invention relates to a method for modifying desulfuration ash produced by a steel enterprise sintering process or a power plant smoke drying method or semidry method smoke desulfuration for cement retarder. The method is characterized by comprising the following steps of: A, performing micro thinning treatment on the desulfuration ash by adopting a ball milling or airflow crushing mode so that the specific surface area of the desulfuration ash grain diameter is 300 to 1,000 m<2> / kg; and B, putting the desulfuration ash subjected to the micro thinning treatment into a closed container of 450 to 700 DEG C, blowing oxygen or air into the closed container, and reacting for 20 to 60 minutes to obtain the modified desulfuration ash for the cement retarder. The method for modifying the desulfuration ash for the cement retarder not only can solve a series of environment problems caused by long-term stacking of the desulfuration ash, but also can produce certain economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method for modifying the desulfurization ash produced by the sintering process of iron and steel enterprises or the flue gas of a power plant after dry or semi-dry flue gas desulfurization and used as a cement retarder. Background technique [0002] Desulfurization ash is the industrial waste produced by the sintering process of iron and steel enterprises / power plant flue gas by dry or semi-dry desulfurization process, and its main components are calcium sulfate and calcium sulfite. Due to the large amount of calcium sulfite, desulfurized ash cannot be used in the production of cementitious wallboard, cement retarder, gypsum board and other building materials industries like desulfurized gypsum. environmental pollution. [0003] In the production of cement, natural gypsum is often used as a retarder, so that the performance of the factory cement meets the relevant national standards. The content of sulfur trioxide in desulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B103/22
Inventor 王洋王维佳陈晨张兰
Owner 中钢集团武汉安全环保研究院有限公司
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