Method for producing limestone powder and aluminium ammonium sulfate using heat-engine plant desulfurized gypsum and fly ash

A technology for desulfurization gypsum and aluminum ammonium sulfate, which is applied in the field of producing stone powder and aluminum ammonium sulfate from desulfurization gypsum and fly ash in thermal power plants, can solve the problem of high production cost of synthetic ammonia, and achieve the advantages of saving purchase, reducing production cost and reducing emissions. Effect

Inactive Publication Date: 2009-08-05
李睿德
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Problems solved by technology

[0003] The invention provides a method for producing stone powder and ammonium aluminum sulfate by using desulfurized gypsum and fly ash in a thermal power plant, which is used to solve the environmental protection

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  • Method for producing limestone powder and aluminium ammonium sulfate using heat-engine plant desulfurized gypsum and fly ash

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Embodiment 1

[0065] Raw material 1: Power plant flue gas desulfurization hydrated gypsum, CaSO 4 The content is 66.8%, the water content is 32.5%, and the rest is impurities; raw material 2: dry ash from power plants, the content of alumina is 40%, the content of iron oxide is 3.11%, the content of magnesium oxide is 0.73%, and the rest is silicon, calcium, etc.

[0066] According to the process of the present invention, 200kg of gypsum with water is processed per hour, three-stage spray absorption reaction, temperature 60°C, time 40 minutes; fly ash 75kg / h, 350°C reaction for 3 hours, clinker dissolution and leaching temperature 95°C , the leaching time was 30 minutes; the ammonium aluminum sulfate was recrystallized and purified 3 times. Limestone powder is produced at 100kg / h, aluminum ammonium sulfate 12 hydrate is produced at 350kg / h, iron hydroxide dry matter is produced at 4kg / h, and the total amount of ammonia water and liquid ammonia (calculated as NH3) is 8.2kg / h.

[0067] The i...

Embodiment 2

[0071] Raw material 1: Power plant flue gas desulfurization gypsum after natural drying, CaSO 4 The content is 74.2%, the water content is 25%, and the rest is impurities; raw material 2: dry ash from power plants, the content of alumina is 40%, the content of iron oxide is 3.11%, the content of magnesium oxide is 0.73%, and the rest is silicon, calcium, etc.

[0072] According to the process of the present invention, 1000 kg of naturally dried gypsum is processed per hour, three-stage spray absorption reaction, temperature 50 ° C, time 40 minutes; while processing fly ash 420 kg / h, 380 ° C reaction for 3 hours, clinker dissolution and leaching The temperature is 100°C, and the time is 40 minutes; ammonium aluminum sulfate is recrystallized and purified 3 times. Produce 550kg / h of stone powder, produce 2350kg / h of aluminum ammonium sulfate 12 hydrate, produce 19kg / h of ferric hydroxide dry matter, supplement the total amount of ammonia water and liquid ammonia (in NH 3 Tota...

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Abstract

The invention discloses a method for producing limestone powder and aluminum ammonium sulfate from desulfurized gypsum and fly ash of thermal power plants. The method comprises the steps of: (1) paste mixing and impurity removal of the desulfurized gypsum; (2) absorption and reaction of gypsum paste and ammonia gas and carbon dioxide gas; (3) solid-liquid separation of an ammonium sulfate solution and a calcium carbonate solid; (4) concentration and crystallization of the ammonium sulfate solution; (5) mixing of the fly ash and ammonium sulfate; (6) production of clinker of the fly ash; (7) dissolution of reaction clinker of the fly ash; (8) multi-stage settling separation and fine filtration of a mixed liquid of aluminum sulfate and aluminum ammonium sulfate; (9) adjustment of pH value of an aluminum sulfate solution; (10) crystallization and recrystallization of the aluminum ammonium sulfate; (11) ammonia replacement and ammonia supplement of a ferric ammonium sulfate solution; and 12) filtration and washing of ferric hydroxide. The method combines the treatment of the desulfurized gypsum with the treatment of the fly ash to produce the aluminum ammonium sulfate and the limestone powder. During the production, carbon dioxide in flue gas can be absorbed, so that the discharge amount of carbon dioxide greenhouse gas can be reduce effectively; the supplement amount of synthetic ammonia is only one fourth of that of the prior method; and the production cost is greatly reduced.

Description

Technical field: [0001] The invention belongs to a method for jointly treating desulfurized gypsum and fly ash in a thermal power plant, in particular to a method for producing stone powder and ammonium aluminum sulfate by using desulfurized gypsum and fly ash in a thermal power plant. Background technique: [0002] A 1000MW thermal power plant consumes hundreds of tons of limestone powder for flue gas desulfurization every day. According to the level of sulfur content in the coal it burns, it needs to produce 200-300 tons of desulfurized gypsum and discharge hundreds of tons of it into the atmosphere. Carbon dioxide greenhouse gas. Like fly ash, the large output of desulfurized gypsum has caused great pressure on the environment and has become an environmental protection problem that needs to be solved urgently. In order to solve this problem, the Dutch Continental Company built a demonstration plant to generate calcium carbonate and ammonium sulfate by reacting ammonium c...

Claims

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Application Information

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IPC IPC(8): C01F7/76C01F11/18
Inventor 李睿德
Owner 李睿德
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