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Separation and recycling method of gypsum residue from flue gas desulfurization in thermal coal power plant

A desulfurization gypsum, separation and recovery technology, applied in the preparation of calcium/strontium/barium sulfate, sulfate/bisulfate, silicon dioxide, etc., can solve the complex chemical composition of flue gas desulfurization gypsum, low chemical purity, impossible Recycling and effective utilization of industrial gypsum waste residues

Active Publication Date: 2018-11-23
响水联谊热电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(5) The chemical composition of flue gas desulfurization gypsum in industrial thermal coal power plants is very complicated, far from being as simple as only converting gypsum. The K of the prior art 2 SO 4 The chemical purity is too low, and the product application value is low
[0009] Therefore, the above-mentioned prior art is just an empty talk, and it is impossible to realize large-scale production of potassium sulfate from flue gas desulfurization gypsum waste residue in industrial coal-fired power plants, and it is impossible to realize resource recycling and effective utilization of this industrial gypsum waste residue

Method used

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  • Separation and recycling method of gypsum residue from flue gas desulfurization in thermal coal power plant
  • Separation and recycling method of gypsum residue from flue gas desulfurization in thermal coal power plant
  • Separation and recycling method of gypsum residue from flue gas desulfurization in thermal coal power plant

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Embodiment

[0105] Separation and recovery of gypsum residue from flue gas desulfurization in thermal coal power plants:

[0106] 1. Add less than 50% dilute sulfuric acid to the above-mentioned waste residue, stir and react, and the reaction formula is:

[0107] CaSO 3 +H 2 SO 4 =CaSO 4 +SO 2 +H 2 O;

[0108] MgCO 3 +H 2 SO 4 =MaSO 4 +CO 2 ↑+H 2 O;

[0109] CaCO 3 +H 2 SO 4 =CaSO 4 +CO 2 +H 2 O;

[0110] Fe 2 o 3 +3H 2 SO 4 =Fe 2 (SO 4 ) 3 +3H 2 O;

[0111] Al 2 o 3 +H 2 O→Al(OH) 3 ;

[0112] 2Al(OH) 3 +3H 2 SO 4 =Al 2 (SO 4 ) 3 +6H 2 O;

[0113] Na 2 O+H 2 O=2NaOH

[0114] K 2 O+H 2 O=2KOH

[0115] 2NaOH+H 2 SO 4 =Na 2 SO 4 +2H 2 O;

[0116] 2KOH+H 2 SO 4 = K 2 SO 4 +2H 2 O;

[0117] Two, add an appropriate amount of water to wash the waste residue to the above (1) to obtain CaSO 4 2H 2 O and SiO 2 Waste residue and H 2 SO 3 , MgSO 4 , Fe 2 (SO 4 ) 3 、Al 2 (SO 4 ) 3 、Na 2 SO 4 、K 2 SO 4 aqueous solution;

[0118...

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Abstract

The invention provides a separation and recovery method of thermal coal power plant flue gas desulfurization gypsum waste residues, relating to the technical field of inorganic chemistry industry. The method mainly comprises the following steps: respectively adding dilute sulfuric acid and a NaOH or KOH water solution, stirring to react, and recovering gypsum, silicic acid, sodium sulfate Na2SO4 or potassium sulfate K2SO4, Fe(OH)3, and basic magnesium carbonate or magnesium carbonate. The method is mainly used for separation and recovery of the thermal coal power plant flue gas desulfurization gypsum waste residues.

Description

Technical field: [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a method for separating, recycling and utilizing gypsum waste residue from flue gas desulfurization in thermal coal power plants. Background technique: [0002] Existing flue gas desulfurization of coal-fired power plants will inevitably produce a large amount of gypsum waste residue, resulting in a huge waste of resources and environmental pressure, but there is no effective method for resource recycling of this gypsum waste residue in the prior art. [0003] Main mineral composition of flue gas desulfurization gypsum residue: [0004] [0005] And the prior art "Liaoning Chemical Industry"--"Experimental Research on the Production of Potassium Sulfate from Calcium Sulfate" (the second phase of the 39th volume, February, 2010, Yang Tiejian, Hunan Vocational and Technical College of Chemical Industry), with gypsum and chloride Potassium in ammonia (NH 3 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01B33/32C01B33/12C01D5/06
Inventor 耿兆翔
Owner 响水联谊热电有限公司