Method for producing cement and vitriol from desulfurized gesso of flue gas

A technology for desulfurization of gypsum and flue gas, applied in the direction of sulfur trioxide/sulfuric acid, etc., to achieve the effects of wide application range, reduction of calcined fuel coal consumption, investment cost and operating cost saving

Inactive Publication Date: 2007-05-09
YONKER ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flue gas desulfurization gypsum is

Method used

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  • Method for producing cement and vitriol from desulfurized gesso of flue gas
  • Method for producing cement and vitriol from desulfurized gesso of flue gas
  • Method for producing cement and vitriol from desulfurized gesso of flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. The raw materials used in raw meal ingredients are shown in Table 1. The reducing agent is industrial anthracite, and its fixed carbon mass content is 54.68%.

[0033] raw material name

[0034] 2. Weigh 188.73g of flue gas desulfurization gypsum, 19.15g of clay, 2.425g of pyrite slag, 6.798g of fly ash and 17.81g of industrial anthracite, which have been dried at 80℃ for 3 hours to remove free water, and mixed and pressurized to make After the cylindrical sample is placed in a watch glass, put into the drying box, the temperature of the drying box is increased to 105 ℃ and dried for 1.5 hours to remove the free water in the material; then take out the test block and put it in the corundum crucible and put it into the muffle furnace, slowly Raise the temperature to 1250°C for 1.5 hours, then heat to 1450°C for 1.5 hours to obtain cement clinker. The clinker rate value is: KH (lime saturation coefficient) 0.94; SM (silicic acid rate) 2.5; IM ( Iron rate) 1.55. ...

Embodiment 2

[0041] 1. Same as 1 in Example 1.

[0042] 2. Weigh 188.86g of flue gas desulfurization gypsum, 16.67g of clay, 2.714g of pyrite slag, 8.880g of fly ash and 17.82g of industrial anthracite, which have been dried at 80℃ for 3 hours to remove free water, and mixed and pressurized to make After the cylindrical sample is placed in a watch glass, put into the drying box, the temperature of the drying box is increased to 105 ℃ and dried for 1.5 hours to remove the free water in the material; then take out the test block and put it in the corundum crucible and put it into the muffle furnace, slowly Raise the temperature to 1250°C for 1.5 hours, then heat to 1450°C for 1.5 hours to obtain cement clinker. The clinker rate value is: KH (lime saturation coefficient) 0.95; SM (silicic acid rate) 2.3; IM ( Iron rate) 1.6.

[0043] The chemical analysis of the cement clinker obtained above is shown in Table 4.

[0044] Calcium Oxide

[0045] The phase composition of the clinker can b...

Embodiment 3

[0049] 1. Same as 1 in Example 1.

[0050] 2. Weigh 187.72g of flue gas desulfurization gypsum, 18.28g of clay, 2.693g of pyrite slag, 7.841g of fly ash and 17.47g of industrial anthracite, which are dried at 80℃ for 3 hours to remove free water, and mixed and pressurized to make After the cylindrical sample is placed in a watch glass, put into the drying box, the temperature of the drying box is increased to 105 ℃ and dried for 1.5 hours to remove the free water in the material; then take out the test block and put it in the corundum crucible and put it into the muffle furnace, slowly Raise the temperature to 1250°C for 1.5 hours, then heat to 1450°C for 1.5 hours to obtain cement clinker. The clinker rate value is: KH (lime saturation coefficient) 0.95; SM (silicic acid rate) 2.3; IM ( Iron rate) 1.6.

[0051] The chemical analysis of the cement clinker obtained above is shown in Table 6.

[0052] Calcium Oxide

[0053] The phase composition of the clinker can be calc...

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Abstract

This invention discloses a method for manufacturing cement and sulfuric acid from flue-gas desulfurized gypsum. The method comprises: (1) drying flue-gas desulfurized gypsum to remove all of free water and part of water of crystallization and form hemi-hydrated gypsum; (2) adding substances containing Fe2O3, Al2O3 and SiO2, adding substances containing carbon, mixing, and heating to 900-1450 deg.C to obtain SO2 gas and cement clinker; (3) washing and purifying SO2 gas with Venturi tube and foam column to remove dust in flue gas, demisting by an electrodemistor, drying by concentrated sulfuric acid, and manufacturing industrial sulfuric acid by double transformation and double absorption method. By this method, flue-gas desulfurized gypsum can be utilized, thus solving the problems of land occupation and second pollution. The method is suitable for treating flue-gas desulfurized gypsum produced from both thermal power plants and desulfurization kilns. The method has such advantages as simple process, low energy consumption and high profit.

Description

Technical field [0001] The invention belongs to a method for producing cement and sulfuric acid, and specifically relates to a method for producing cement and sulfuric acid from flue gas desulfurized gypsum. Background technique [0002] The research on gypsum production of sulfuric acid and cement technology began in the early 20th century. In 1916, Müller and Quorner in Germany developed natural gypsum production of sulfuric acid and cement technology and established pilot plants. Subsequently, Britain, France, Poland, Austria, and South Africa have successively built natural gypsum, anhydrite and phosphogypsum A device for producing sulfuric acid and cement as raw materials and put into production. Its average production capacity is 160 tons of sulfuric acid and cement clinker each day. Due to various reasons such as technology and energy consumption, the production facilities of the above-mentioned factories have been shut down one after another. In the 1980s, due to the larg...

Claims

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Application Information

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IPC IPC(8): C04B11/26C01B17/69
Inventor 申晓东冯延林王东秋谢光辉刘仁和李勇
Owner YONKER ENVIRONMENTAL PROTECTION
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