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Technology of sintering sulfur aluminate cement using desulfur ash

A technology of sulphoaluminate cement and desulfurization ash, which is applied in the field of firing sulphoaluminate cement, can solve the problem that the high-sulfur and high-calcium components of desulphurization ash are difficult to use, and achieve the effect of efficient utilization

Inactive Publication Date: 2008-06-25
SHANDONG UNIV
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Problems solved by technology

[0010] In view of the complex and difficult-to-use characteristics of desulfurized ash with high sulfur and high calcium components, and in combination with the problem of limited raw materials in the production process of sulphoaluminate cement, the present invention proposes a method of burning sulphoaluminate cement with desulphurized ash as one of the main components method

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  • Technology of sintering sulfur aluminate cement using desulfur ash
  • Technology of sintering sulfur aluminate cement using desulfur ash

Examples

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example 1

[0017] Example 1: Desulfurization ash, limestone and gypsum produced by desulfurization of coal are used as raw materials. After the mixture is ground, it is calcined in a kiln, and desulfurization ash, limestone and gypsum are used for ingredients. 36.2%, limestone 61.8%, gypsum 2%, and the main components of desulfurization ash are: SiO 2 Accounting for 43.7%, Al 2 o 3 Accounting for 24.8%, Fe 2 o 3 4.1%, CaO 11.8%, SO 3 7.5%. The calcination temperature is 1300° C., and the calcination time is 30 minutes. The obtained product has been subjected to a compressive strength test, and the compressive strengths at 3 days and 28 days are 27.6 MPa and 48.5 MPa respectively.

example 2

[0018] Example 2: Desulfurization ash, limestone and gypsum produced by desulfurization of coal are used as raw materials. After the mixture is ground, it is calcined in a kiln, and desulfurization ash, limestone and gypsum are used for batching. By weight percentage, desulfurization ash accounts for 34.3%, limestone 53.4%, gypsum 12.3%, and the main components of desulfurization ash are: SiO 2 Accounting for 48.7%, Al 2 o 3 Accounting for 31.8%, Fe 2 o 3 6.1%, CaO 2.8%, SO 3 1.5%. Calcination conditions are the same as the previous example. The obtained product has been subjected to a compressive strength test, and the compressive strengths at 3 days and 28 days are 25.6 MPa and 47.9 MPa respectively.

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Abstract

The present invention is technological process of baking aluminosulfate cement with desulfurized ash, which has high sulfur and calcium contents and complicated components, as main material. The process converts desulfurized ash into aluminosulfate cement effectively, and needs the addition of no or small amount of bauxite and gypsum.

Description

technical field [0001] The invention relates to a firing method of sulphoaluminate cement, in particular to a method for firing sulphoaluminate cement by using desulfurization ash from a coal-fired power plant as one of the main components. Background technique [0002] Sulphoaluminate cement is a new cement series, known as the third series cement. Sulphoaluminate cement uses limestone, bauxite and gypsum as raw materials for production, and is calcined at 1300-1350°C at a low temperature. The main mineral of clinker is calcium sulphoaluminate (3CaO 3Al 2 o 3 ·CaSO 4 ) and dicalcium silicate (2CaO·SiO 2 ). Calcium sulfoaluminate has the characteristics of fast hydration, fast hardening, and concentrated heat release. It is an early-strength mineral and the main source of early strength of sulfoaluminate cement; it is combined with silicic acid with slow hydration and large strength increase in the later period. Dicalcium, so that the sulphoaluminate cement has better e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32
Inventor 王文龙马春元董勇徐夕仁宋占龙
Owner SHANDONG UNIV
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