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Method for conducting sulfur-containing flue gas desulfuration by means of alkaline waste

A waste residue and alkaline technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of low desulfurization efficiency, and achieve the effects of high desulfurization efficiency, improved dissolution rate, and improved desulfurization effect.

Inactive Publication Date: 2019-09-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem of low desulfurization efficiency in pulp desulfurization in the prior art

Method used

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  • Method for conducting sulfur-containing flue gas desulfuration by means of alkaline waste
  • Method for conducting sulfur-containing flue gas desulfuration by means of alkaline waste
  • Method for conducting sulfur-containing flue gas desulfuration by means of alkaline waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Using industrial waste iron-containing waste acid to add water to prepare Fe-containing 3+ waste acid, preparation of red mud slurry, preparation of phosphate rock slurry, preparation of magnesium ore slurry, preparation of copper ore slurry. Fe-containing 3+ The waste acid concentration is 0.5%, red mud (the main component mass percentage of red mud solid is Al 2 o 3 20%, SiO 2 8%, Fe 2 o 3 35%, CaO 12%, Na 2 O 5%, TiO 2 3%), phosphate rock (the mass percentage of the solid component of phosphate rock is P 2 o 5 31.54%, CaO 43.5%, SiO 2 14.92%, Al 2 o 3 2.05%, Fe 2 o 3 1.22%, MgO 0.13%, other 6.64%), magnesium ore (magnesium ore solid main component mass percentage is MgO 21%, SiO 2 3%, Al 2 o 3 0.1%, Fe 2 o 3 0.2%, CaO 1%), copper ore (copper ore solid main component mass percentage is Cu0.45%, Fe 44%, Fe 3 o 4 4%, CaO 3%, Al 2 o 3 8%, MgO 1%, SiO 2 31%, S 1%). Grind the red mud solid to 100 mesh, and mix the ground red mud and wa...

Embodiment 2

[0061] Using industrial waste iron-containing waste acid to add water to prepare Fe-containing 3+ Waste acid, preparation of red mud slurry, preparation of phosphate rock slurry, preparation of magnesium ore slurry, preparation of copper ore slurry. Fe-containing 3+ The concentration of waste acid solution is 0.6%, red mud (the main component mass percentage of red mud solid is Al 2 o 3 18%, SiO 2 10%, Fe 2 o 3 25%, CaO 15%, Na 2 O 2%, TiO 2 21%), phosphate rock (the mass percentage of the solid main component of phosphate rock is P 2 o 5 23.94%, CaO 41.48%, SiO 2 8.37%, Al 2 o 3 1.37%, Fe 2 o 3 1.57%, MgO 3.65%), magnesium ore (magnesium ore solid main component mass percentage is MgO 31%, SiO 2 2%, Al 2 o 3 0.2%, Fe 2 o 3 0.04%, CaO 3%), copper ore (copper ore solid main component mass percentage is Cu0.9%, Fe 34%, Fe 3 o 4 4%, CaO 5%, Al 2 o 3 5%, MgO 1%, SiO 2 32%, S 1%). Grind the red mud solid to 100 mesh, and mix the ground red mud an...

Embodiment 3

[0064] Using industrial waste iron-containing waste acid to add water to prepare Fe-containing 3+ Waste acid, preparation of red mud slurry, preparation of phosphate rock slurry, preparation of magnesium ore slurry, preparation of copper ore slurry. Fe-containing 3+ The concentration of waste acid solution is 0.7%, red mud (the main component mass percent of red mud solid is Al 2 o 3 25%, SiO 2 14%, Fe 2 o 3 40%, CaO 16%, Na 2 O 8%, TiO 2 4%), phosphate rock (the mass percentage of the solid main component of phosphate rock is P 2 o 5 32.07%, CaO 46.95%, SiO 2 4.68%, Al 2 o 3 6.00%, Fe 2 o 3 2.68%, MgO 2.59%), magnesium ore (magnesium ore solid main component mass percentage is MgO 66%, SiO 2 1%, Al 2 o 3 0.2%, Fe 2 o 3 0.04%, CaO 2%), copper ore (copper ore solid main component mass percentage is Cu0.6%, Fe 37%, Fe 3 o 4 3%, CaO 8%, Al 2 o 3 5%, MgO 1%, SiO 2 32%, S 2%). Grind the red mud solid to 400 mesh, and mix the ground red mud and wa...

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Abstract

The invention provides a method for conducting sulfur-containing flue gas desulfurization by means of alkaline waste, and belongs to the technical field of waste treatment. By introducing Fe<3+>-containing waste acid, Fe<3+> serves as a regulator to participate in a desulfurization reaction so as to make the effective component Fe<3+> in the alkaline waste dissolved out, the dissolution rate of iron in the alkaline waste is increased, the dissolved Fe<3+> can catalytically oxidize SO2, and SO2 in sulfur-containing flue gas is converted into sulfuric acid, so that desulfurization is completed;in addition, solubility equilibrium of sulfur dioxide in the sulfur-containing flue gas is broken, the pH value continues to be lowered in the desulfurization process, dissolution of an iron compoundin the alkaline waste is promoted, and then Fe<3+> is dissolved out, so that the desulfurization reaction continues to be conducted.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a method for desulfurizing flue gas containing sulfur by using alkaline waste residue. Background technique [0002] Industrial processes such as non-ferrous smelting and boiler use produce a large amount of sulfur-containing flue gas. At present, my country's treatment technologies mainly include limestone-gypsum, ammonia desulfurization, activated carbon adsorption desulfurization, and pulp desulfurization. Among them, pulp desulfurization can be divided into red mud slurry, phosphate slurry, copper slurry, magnesium slurry, etc. according to the type of slag used. SiO removal from red mud residue 2 In addition to other acid insoluble matter, Fe 2 o 3 、Al 2 o 3 , CaO, Na 2 O, etc. can be used as good desulfurizers. Phosphate slag is mainly composed of Ca 3 (PO 4 ) 2· QUR 2 (where R is F, Cl, OH group), CaO and MgO mainly exist in the form of carbonate, accom...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/80B01D53/50B01D2251/402B01D2251/404B01D2251/602
Inventor 李彬王婕张英杰宁平董鹏赵星婷
Owner KUNMING UNIV OF SCI & TECH
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