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Method for drying and pelleting desulfurization gypsum for cement retarder

The technology of desulfurization gypsum and setting control agent is applied in the field of desulfurization gypsum drying of granulation and cement setting control agent, which can solve the problems of high water content and high cost, and achieve the effects of low free water content, easy control and stable cutting.

Inactive Publication Date: 2011-02-16
襄阳安格尔建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the amount of homogeneous substances added is relatively large, the cost is high, and the moisture content in the final gypsum is still as high as 5%.

Method used

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  • Method for drying and pelleting desulfurization gypsum for cement retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use 910g of desulfurized gypsum with a water content of 13.6%, add 30g of quicklime, 40g of aluminate cement, and 20g of Portland cement; then stir in a mixer at 30°C for 5 minutes, and store at 40°C-30°C for 1 day to obtain dryness. Granular product; product particle size: 0.2mm sieve 65%, free water content 0.84%, SO 3 Content 40.69%.

Embodiment 2

[0015] Use 900g of desulfurized gypsum with a water content of 12.8%, add 20g of slaked lime, 20g of calcium carbide slag, 30g of sulphoaluminate cement, and 30g of iron-aluminate cement; then stir in a mixer at 25°C for 5 minutes, and store at 50°C-35°C A dry, granular product can be obtained in 1 day; product particle size: 55% of 0.2mm sieve, free water content of 1.60%, SO 3 Content 40.10%.

Embodiment 3

[0017] Use 860g of desulfurized gypsum with a water content of 13.6%, mix with 60g of quicklime, 30g of sulphoaluminate cement, and 50g of Portland cement; then stir in a mixer at 40°C for 5 minutes, store at 50°C-40°C for 1 day to dry , granular products; product particle size: 0.2mm sieve 70%, free water content 1.04%, SO 3 Content 39.75%.

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Abstract

The invention discloses a method for drying and pelleting desulfurization gypsum for a cement retarder, which is used for flue gas desulfurization and building materials. The method comprises the following steps of: mixing 98 to 85 mass percent of raw desulfurization gypsum and 2 to 15 mass percent of calcium material and silicon-aluminum material and together stirring for 2 to 30 minutes in a mixer, wherein the stirring temperature is room temperature of 120 DEG C below zero; and storing the stirred mixed materials at room temperature of 100 DEG C below zero for more than 6 hours, wherein the calcium material is one or more of quick lime, slaked lime and carbide slag and accounts for 0.1 to 10 mass percent of the mixed materials; and the silicon-aluminum material is one or more of aluminate cement, sulfate aluminum cement, aluminoferic cement and portland cement and accounts for 0.1 to 10 mass percent of the mixed materials. The method for drying and pelleting the desulfurization gypsum does not need extruding and pelleting, and the desulfurization gypsum has low free water content and high liquidity, is stable to feed, is easy to control, and can be safely used for cement production.

Description

technical field [0001] The invention relates to the fields of flue gas desulfurization and building materials, in particular to a method for drying and granulating desulfurized gypsum used as a cement coagulant. Background technique [0002] Desulfurization gypsum has been widely used in cement production as a cement setting agent. However, the desulfurized gypsum from the thermal power plant contains 10-15% water, and its fluidity is not good. When it is used in cement production, there are often situations such as silo storage and unbalanced feeding, resulting in SO 3 Large fluctuations will affect the stability of cement quality; at the same time, the water carried by desulfurized gypsum will increase the moisture content of the grinding material by 0.5-0.8%, which will have adverse effects on cement grinding and cement performance. [0003] Two Chinese patents titled "A method for wet granulation of desulfurized gypsum" and "Dry granulation process for desulfurized gyps...

Claims

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Application Information

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IPC IPC(8): C04B22/14
CPCC04B22/145C04B11/264C04B11/30C04B11/005C04B11/007C04B11/024
Inventor 龙世宗
Owner 襄阳安格尔建材科技有限公司
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