CN107601530A - A kind of glauber salt production waste calcium carbonate is used as the method for flue gas desulfurization - Google Patents
A kind of glauber salt production waste calcium carbonate is used as the method for flue gas desulfurization Download PDFInfo
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- CN107601530A CN107601530A CN201710797010.6A CN201710797010A CN107601530A CN 107601530 A CN107601530 A CN 107601530A CN 201710797010 A CN201710797010 A CN 201710797010A CN 107601530 A CN107601530 A CN 107601530A
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- calcium carbonate
- sodium
- flue gas
- calcium
- carbonate
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Abstract
The invention discloses the method that a kind of glauber salt production waste calcium carbonate is used as flue gas desulfurization, step is：It S1, addition sodium carbonate and sodium hydroxide will be chemically reacted in the solution containing calcium sulfate in refined purge segment, and produce precipitation of calcium carbonate, sodium sulphate and a small amount of magnesium hydrate precipitate；S2, above-mentioned reacted solution filtered, and be passed through clear water in filter mechanism simultaneously, remove other impurities, finally obtain pure calcium carbonate, and by the calcium carbonate collection；S3, water is added to obtain calcium carbonate suspension the calcium carbonate of collection, calcium carbonate suspension is sent in desulphurization system, sulfur dioxide and calcium carbonate reaction in desulphurization system in flue gas, desulphurization reaction liquid is ultimately produced after aerating oxidation；S4, the desulphurization reaction liquid by generation, it is sent into dehydration equipment and device and is dehydrated, finally obtain desulfurated plaster of the moisture content below 20%.The beneficial effects of the invention are as follows：Realize that intermediate product recycles, be cost-effective.
Description
Technical field
The present invention relates to glauber salt to produce waste residue technical field of comprehensive utilization, and particularly a kind of glauber salt production calcium carbonate gives up
Slag is used as the method for flue gas desulfurization.
Background technology
Sichuan mineral products glauber salt raw materials for production come from glauberite at present, and the exploitation of glauberite uses " Cavern Solution Mining
Method ", coarse sulfide water made from this method are this because the impurity such as sulfur acid calcium magnesium sulfate can influence glauber salt quality and fouling of heat exchangers
It must be purified, the method purified at present has " two alkaline process " and " lime flue gas method ", and both purification methods can produce carbon
Sour calcium, the traditional processing method of the calcium carbonate are to be directly injected into mine down-hole stope, and this method can cause stope to block, and influence to adopt
Field service life.
The present invention provides the method that a kind of glauber salt production waste calcium carbonate is used as flue gas desulfurization, it is practical, perfect and
Easily solves above mentioned problem.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided one kind realizes that intermediate product recycles, be cost-effective
Glauber salt production waste calcium carbonate be used as flue gas desulfurization method.
The purpose of the present invention is achieved through the following technical solutions：A kind of glauber salt production waste calcium carbonate takes off as flue gas
The method of sulphur, step are：
S1, addition sodium carbonate and sodium hydroxide it will be chemically reacted in the solution containing calcium sulfate in refined purge segment, essence
Contain sodium sulphate, sodium chloride, calcium sulfate and magnesium sulfate in solution in link processed, main chemical reactions equation is Na2CO3+
CaSO4=CaCO3↓+Na2SO4, new precipitation of calcium carbonate and sodium sulphate are produced, contains sodium sulphate, chlorination in reacted solution
Sodium, precipitation of calcium carbonate, magnesium hydrate precipitate, sodium carbonate, sodium hydroxide, micro calcium sulfate and micro magnesium sulfate；
S2, above-mentioned reacted solution filtered, and be passed through clear water in filter mechanism simultaneously, remove sodium sulphate, chlorination
Sodium, calcium carbonate, calcium hydroxide, sodium carbonate, micro calcium sulfate and micro magnesium sulphate impurity, finally obtain pure carbonic acid
Calcium, and by the calcium carbonate collection；
S3, water is added to obtain calcium carbonate suspension the calcium carbonate of collection, calcium carbonate suspension is sent in desulphurization system, to desulfurization system
The flue gas containing sulfur dioxide is passed through in system, is chemically reacted as SO2+ H2O=H2SO3, H2SO3+ CaCO3=CaSO3+ CO2+
H2O, 2CaSO3+ O2=2CaSO4, ultimately produce desulphurization reaction liquid；
S4, the desulphurization reaction liquid by generation, be sent into dehydration equipment and device and be dehydrated, finally obtain moisture content 20% with
Under desulfurated plaster.
The calcium carbonate generated in described step S1 is re-used into step S3, realizes recycling for calcium carbonate.
Solid-liquid suspension mass percent is in 5%-40% in described step S3, wherein, the content of sodium sulphate is less than 10G/
L。
Desulfurated plaster can serve as the retarder of cement production process in described step S4, realize secondary use, and this is de-
In sulphur gypsum, basicity is less than 2%, and the crystallization water is more than 10%, and sulfur trioxide content is more than 30%.
The present invention has advantages below：The present invention realizes recycling for intermediate product calcium carbonate, avoids waste, together
When finally caused desulfurated plaster be supplied to cement production enterprise to be used as cement retarder, realize and discarded object recycled,
Reduce desulfurization material buying expenses and add the income from sales of gypsum product.
Embodiment
The present invention will be further described below, and protection scope of the present invention is not limited to as described below：
A kind of glauber salt production waste calcium carbonate is used as the method for flue gas desulfurization, and step is：
S1, addition sodium carbonate and sodium hydroxide it will be chemically reacted in the solution containing calcium sulfate in refined purge segment, essence
Contain sodium sulphate, sodium chloride, calcium sulfate and magnesium sulfate in solution in link processed, main chemical reactions equation is Na2CO3+
CaSO4=CaCO3↓+Na2SO4, new precipitation of calcium carbonate and sodium sulphate are produced, contains sodium sulphate, chlorination in reacted solution
Sodium, precipitation of calcium carbonate, magnesium hydrate precipitate, sodium carbonate, sodium hydroxide, micro calcium sulfate and micro magnesium sulfate；
S2, above-mentioned reacted solution filtered, and be passed through clear water in filter mechanism simultaneously, remove sodium sulphate, chlorination
Sodium, calcium carbonate, calcium hydroxide, sodium carbonate, micro calcium sulfate and micro magnesium sulphate impurity, finally obtain pure carbonic acid
Calcium, and by the calcium carbonate collection；
S3, water is added to obtain calcium carbonate suspension the calcium carbonate of collection, calcium carbonate suspension is sent in desulphurization system, to desulfurization system
The flue gas containing sulfur dioxide is passed through in system, is chemically reacted as SO2+ H2O=H2SO3, H2SO3+ CaCO3=CaSO3+ CO2+
H2O, 2CaSO3+ O2=2CaSO4, ultimately produce desulphurization reaction liquid；
S4, the desulphurization reaction liquid by generation, be sent into dehydration equipment and device and be dehydrated, finally obtain moisture content 20% with
Under desulfurated plaster.
In the present embodiment, the calcium carbonate generated in described step S1 is re-used into step S3, realizes calcium carbonate
Recycle.
Solid-liquid suspension mass percent is in 5%-40% in described step S3, wherein, the content of sodium sulphate is less than 10G/
L。
Desulfurated plaster can serve as the retarder of cement production process in described step S4, realize secondary use, and this is de-
In sulphur gypsum, basicity is less than 2%, and the crystallization water is more than 10%, and sulfur trioxide content is more than 30%.
Described above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, the exclusion to other embodiment is not to be taken as, and can be used for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change does not depart from the spirit and scope of the present invention, then all should be in the protection domain of appended claims of the present invention
It is interior.
Claims (4)
1. a kind of glauber salt production waste calcium carbonate is used as the method for flue gas desulfurization, it is characterised in that：Step is：
S1, addition sodium carbonate and sodium hydroxide it will be chemically reacted in the solution containing calcium sulfate in refined purge segment, essence
Contain sodium sulphate, sodium chloride, calcium sulfate and magnesium sulfate in solution in link processed, main chemical reactions equation is Na2CO3+
CaSO4=CaCO3↓+Na2SO4, new precipitation of calcium carbonate and sodium sulphate are produced, contains sodium sulphate, chlorination in reacted solution
Sodium, precipitation of calcium carbonate, magnesium hydrate precipitate, sodium carbonate, sodium hydroxide, micro calcium sulfate and micro magnesium sulfate；
S2, above-mentioned reacted solution filtered, and be passed through clear water in filter mechanism simultaneously, remove sodium sulphate, chlorination
Sodium, calcium carbonate, calcium hydroxide, sodium carbonate, micro calcium sulfate and micro magnesium sulphate impurity, finally obtain pure carbonic acid
Calcium, and by the calcium carbonate collection；
S3, water is added to obtain calcium carbonate suspension the calcium carbonate of collection, calcium carbonate suspension is sent in desulphurization system, to desulfurization system
The flue gas containing sulfur dioxide is passed through in system, is chemically reacted as SO2+H2O=H2SO3, H2SO3+CaCO3=CaSO3+CO2+H2O,
2CaSO3+O2=2CaSO4, ultimately produce desulphurization reaction liquid；
S4, the desulphurization reaction liquid by generation, be sent into dehydration equipment and device and be dehydrated, finally obtain moisture content 20% with
Under desulfurated plaster.
2. a kind of glauber salt production waste calcium carbonate according to claim 1 is used as the method for flue gas desulfurization, its feature exists
In：The calcium carbonate generated in described step S1 is re-used into step S3, realizes recycling for calcium carbonate.
3. a kind of glauber salt production waste calcium carbonate according to claim 1 is used as the method for flue gas desulfurization, its feature exists
In：Solid-liquid suspension mass percent is in 5%-40% in described step S3, wherein, the content of sodium sulphate is less than 10G/L.
4. a kind of glauber salt production waste calcium carbonate according to claim 1 is used as the method for flue gas desulfurization, its feature exists
In：Desulfurated plaster can serve as the retarder of cement production process in described step S4, realize secondary use, and the desulfurated plaster
In, basicity is less than 2%, and the crystallization water is more than 10%, and sulfur trioxide content is more than 30%.
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|---|---|---|---|
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| CN201710797010.6A CN107601530A (en) | 2017-09-06 | 2017-09-06 | A kind of glauber salt production waste calcium carbonate is used as the method for flue gas desulfurization |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157005A (en) * | 2007-07-31 | 2008-04-09 | 郑州大学 | A processing method and apparatus of coal-firing gas |
| CN101850992A (en) * | 2010-02-11 | 2010-10-06 | 汪晋强 | Method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash |
| KR20110116802A (en) * | 2010-04-20 | 2011-10-26 | 주식회사 케이씨씨 | A process for preparing sodium sulfate, gypsum and aluminum hydroxide from sodium aluminum sulfate |
| CN103570041A (en) * | 2012-08-06 | 2014-02-12 | 中国中轻国际工程有限公司 | Purification process for brine with high sodium sulphate content |
| CN105032149A (en) * | 2015-07-07 | 2015-11-11 | 沈阳化工大学 | Calcium carbonate/calcium hydrate-gypsum wet desulphurization and dedusting process for flue gas |
| CN204865501U (en) * | 2015-07-07 | 2015-12-16 | 沈阳化工大学 | Calcium carbonate calcium hydrate - gypsum wet flue gas desulfurization dust collector |
| CN205216570U (en) * | 2015-11-26 | 2016-05-11 | 石棉县亿欣钙业有限责任公司 | Calcium carbonate sweetener |
-
2017
- 2017-09-06 CN CN201710797010.6A patent/CN107601530A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157005A (en) * | 2007-07-31 | 2008-04-09 | 郑州大学 | A processing method and apparatus of coal-firing gas |
| CN101850992A (en) * | 2010-02-11 | 2010-10-06 | 汪晋强 | Method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash |
| KR20110116802A (en) * | 2010-04-20 | 2011-10-26 | 주식회사 케이씨씨 | A process for preparing sodium sulfate, gypsum and aluminum hydroxide from sodium aluminum sulfate |
| CN103570041A (en) * | 2012-08-06 | 2014-02-12 | 中国中轻国际工程有限公司 | Purification process for brine with high sodium sulphate content |
| CN105032149A (en) * | 2015-07-07 | 2015-11-11 | 沈阳化工大学 | Calcium carbonate/calcium hydrate-gypsum wet desulphurization and dedusting process for flue gas |
| CN204865501U (en) * | 2015-07-07 | 2015-12-16 | 沈阳化工大学 | Calcium carbonate calcium hydrate - gypsum wet flue gas desulfurization dust collector |
| CN205216570U (en) * | 2015-11-26 | 2016-05-11 | 石棉县亿欣钙业有限责任公司 | Calcium carbonate sweetener |
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Application publication date: 20180119 |