CN102580485A - Flue gas desulfurization method for preparing desulfurizer by utilizing magnesite tailings obtained through flotation - Google Patents
Flue gas desulfurization method for preparing desulfurizer by utilizing magnesite tailings obtained through flotation Download PDFInfo
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- CN102580485A CN102580485A CN2012100449562A CN201210044956A CN102580485A CN 102580485 A CN102580485 A CN 102580485A CN 2012100449562 A CN2012100449562 A CN 2012100449562A CN 201210044956 A CN201210044956 A CN 201210044956A CN 102580485 A CN102580485 A CN 102580485A
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- desulfurization
- flue gas
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Abstract
The invention discloses a method for preparing a flue gas desulfurizer by utilizing the magnesite tailings obtained through flotation, thus increasing the desulfurization efficiency and reducing the operating cost of the desulfurization technology. The method comprises the following steps of: selecting magnesite tailings (with particle size of less than 200 meshes) obtained through flotation and water to prepare desulfurization slurry according to a weight percent of 10%-40%, adding 0.2wt%-1wt% of citric acid in the desulfurization slurry, acidizing the slurry, and curing for 15-30minutes to prepare the desulfurizer. The desulfurizer is sent to a desulfurization tower to react with SO2 in the flue gas; and the desulfurization reaction temperature of the desulfurization tower is controlled to 50-60 DEG C, the pH value of the circulation slurry is controlled to 5-6.5, MgCO3 in the desulfurization slurry of the desulfurization tower and SO2 in the flue gas perform a chemical reaction to generate MgSO3 and remove SO2 in the flue gas. By using the desulfurizer prepared by the method, the desulfurization effectiveness is long and the desulfurization efficiency is above 90%; and the SO2 discharge quantity of the thermal power enterprise can be reduced so as to realize the sustainable utilization of resources and environmental protection.
Description
Technical field
The present invention relates to the Coal,steam plant with FGD field, particularly a kind of fume desulphurization method that utilizes magnesite mine tailing after the flotation to prepare desulfurizing agent.
Background technology
Electric power heating power industry SO2 emissions account for 88.5% of Total sulfur dioxide discharge capacity, SO in the flue gas
2Direct discharging meeting aspects such as natural ecological environment, industrial and agricultural production and human beings'health are worked the mischief.China's flue gas desulfurization mainly is wet type calcium-based desulfurization technology at present, and calcium-based desulfurization has the operating cost height, system complex and easy fouling, and desulfurization afterproduct utilization ratio again is low, and byproduct is difficult to handle, and causes the shortcoming of secondary pollution.And the desulfurization of magnesium base has moved more than 20 year in the U.S. and Japan, has that desulfuration efficiency height, desulphurization system are stable, an advantage such as small investment, operation and maintenance cost are low, recyclable accessory substance.But the desulfurizing agent light calcined magnesia prepares problems such as having smoke pollution, manufacturing cost height in the process, and the popularization of wet method magnesium base sulfur removal technology is affected.Open (bulletin) number CN1320945C of Chinese patent; Name is called " utilizing mineral powder of magnesite to carry out the method for flue gas desulfurization "; Introduced and utilized the raw magnesite stone flour to be 250-300 purpose powder through ball mill grinding; Replace light calcined magnesia to be used for wet fuel gas desulfurizing technology,, be beneficial to applying of wet method magnesium base flue gas desulfurization technique to reduce the operating cost of wet method magnesium base flue gas desulfurization technique.But it is low that raw magnesite has a desulfuration efficiency, has only about 25%, and the short shortcoming of desulfurization timeliness, can't satisfy the instructions for use of thermal power generation corporations to fume desulfurizing agent.
Summary of the invention
The invention provides a kind of fume desulphurization method that utilizes magnesite mine tailing after the flotation to prepare desulfurizing agent, magnesite mine tailing after the flotation is handled through the citric acid acidifying, promote MgCO
3Dissolving ionization in desulfurization slurry can significantly improve desulfuration efficiency and reach more than 90%, reduces sulfur removal technology operating cost.
The present invention provides the fume desulphurization method technical scheme of utilizing the magnesite mine tailing to prepare desulfurizing agent following:
Magnesite mine tailing essential mineral is magnesium carbonate mutually after the flotation; Get less than magnesite mine tailing and water after the 200 purpose flotation by mass percentage 10%～40% ratio be made into desulfurization slurry; The citric acid that in desulfurization slurry, adds mass percent 0.2%～1%; Slurries are carried out acidification, promote MgCO
3Dissolving ionization, slaking 15～30min processes desulfurizing agent.
With desulfurizing agent send in the desulfurizing tower with flue gas in SO
2Reaction.Desulfurization reaction temperature is at 50 ℃～60 ℃ in the control desulfurizing tower, and the loop slurry pH value is controlled between 5～6.5, the MgCO in desulfurizing tower in the desulfurization slurry
3With the SO in the flue gas
2Chemical reaction takes place generate MgSO
3, realize SO in the flue gas
2Removal.
The present invention compared with prior art, significant beneficial effect is embodied in:
Magnesite mine tailing after the flotation is used for wet fuel gas desulfurizing technology after acidification; It is high to overcome present thermal power plant wet method calcium-based desulfurization equipment operating cost; System complex is prone to fouling, and desulfurization afterproduct utilization ratio again is low, and byproduct is difficult to shortcomings such as processing.Reduce wet method Mg-base desulfurizing agent light calcined magnesia and prepare energy resource consumption and smoke pollution in the process, reduce the manufacturing cost of desulfurizing agent, improve wet method magnesium base sulfur removal technology, be beneficial to applying of wet method magnesium base sulfur removal technology; Can improve simultaneously the comprehensive utilization ratio of magnesite mine tailing after the flotation, reduce that the magnesite mine tailing turns waste into wealth the mine tailing resource, for a new way is opened up in the utilization again of magnesite mine tailing resource after the flotation to the destruction of mining area surrounding environment after the flotation.Use the desulfurizing agent of the present invention's preparation, the desulfurization timeliness is long, and desulfuration efficiency reaches more than 90%; Moreover can reduce the discharge capacity of thermal power generation corporations' sulfur dioxide, thereby realize the doulbe-sides' victory of Sustainable utilization of resources and environmental protection.
The specific embodiment
More describe the present invention in detail with embodiment below:
Magnesite mine tailing after the flotation of selecting, its essential mineral is magnesium carbonate mutually.Process desulfurization slurry with getting after the magnesite mine tailing screening after the flotation to join in the 1000kg water, in slurries, add the 2kg citric acid, slurries are carried out acidification, to promote MgCO less than 200 purpose mine tailing 100kg
3Dissolving ionization, slaking 30min becomes desulfurizing agent again.
Desulfurizing agent is sent in the desulfurizing tower, and temperature is 55 ℃～60 ℃ in the control desulfurizing tower, and the loop slurry pH value is 5.5, the MgCO in the desulfurization slurry
3With the SO in the flue gas
2Reaction generates MgSO
3Thereby, realize SO in the flue gas
2Removal, desulfuration efficiency can reach more than 95%.
Claims (1)
1. fume desulphurization method that utilizes magnesite mine tailing after the flotation to prepare desulfurizing agent; It is characterized in that: get less than magnesite mine tailing and water after the 200 purpose flotation by mass percentage 10%～40% ratio be made into desulfurization slurry; The citric acid that in desulfurization slurry, adds mass percent 0.2%～1%; Slurries are carried out acidification, promote MgCO
3Dissolving ionization, slaking 15～30min processes desulfurizing agent; With desulfurizing agent send in the desulfurizing tower with flue gas in SO
2Reaction, desulfurization reaction temperature is at 50 ℃～60 ℃ in the control desulfurizing tower, and the loop slurry pH value is controlled between 5～6.5, the MgCO in desulfurizing tower in the desulfurization slurry
3With the SO in the flue gas
2Chemical reaction takes place generate MgSO
3, realize SO in the flue gas
2Removal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100449562A CN102580485A (en) | 2012-02-24 | 2012-02-24 | Flue gas desulfurization method for preparing desulfurizer by utilizing magnesite tailings obtained through flotation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100449562A CN102580485A (en) | 2012-02-24 | 2012-02-24 | Flue gas desulfurization method for preparing desulfurizer by utilizing magnesite tailings obtained through flotation |
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| CN102580485A true CN102580485A (en) | 2012-07-18 |
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| CN2012100449562A Pending CN102580485A (en) | 2012-02-24 | 2012-02-24 | Flue gas desulfurization method for preparing desulfurizer by utilizing magnesite tailings obtained through flotation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528781A (en) * | 2014-11-26 | 2015-04-22 | 中化化肥有限公司成都研发中心 | Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings |
| CN107398171A (en) * | 2017-06-14 | 2017-11-28 | 昆明理工大学 | A kind of method that acid gas in flue gas is removed using metal tailings |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955966A (en) * | 1974-03-06 | 1976-05-11 | August Thyssen-Hutte Ag | Method for dispensing a fluidizable solid from a pressure vessel |
| CN1334324A (en) * | 2001-07-02 | 2002-02-06 | 广州市粤首实业有限公司 | Efficient sulfur-fixating agent for fuel coal and its preparing process and application |
| CN1727055A (en) * | 2005-07-26 | 2006-02-01 | 六合天融（北京）环保科技有限公司 | Method for carrying out flue gas desulfurization by using mineral powder of magnesite |
| WO2011031277A1 (en) * | 2009-09-14 | 2011-03-17 | Barry Hugghins | Method for wet flue gas desulfurization |
-
2012
- 2012-02-24 CN CN2012100449562A patent/CN102580485A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955966A (en) * | 1974-03-06 | 1976-05-11 | August Thyssen-Hutte Ag | Method for dispensing a fluidizable solid from a pressure vessel |
| CN1334324A (en) * | 2001-07-02 | 2002-02-06 | 广州市粤首实业有限公司 | Efficient sulfur-fixating agent for fuel coal and its preparing process and application |
| CN1727055A (en) * | 2005-07-26 | 2006-02-01 | 六合天融（北京）环保科技有限公司 | Method for carrying out flue gas desulfurization by using mineral powder of magnesite |
| WO2011031277A1 (en) * | 2009-09-14 | 2011-03-17 | Barry Hugghins | Method for wet flue gas desulfurization |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528781A (en) * | 2014-11-26 | 2015-04-22 | 中化化肥有限公司成都研发中心 | Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings |
| CN107398171A (en) * | 2017-06-14 | 2017-11-28 | 昆明理工大学 | A kind of method that acid gas in flue gas is removed using metal tailings |
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Application publication date: 20120718 |