CN103908886A - Method for desulphurizing by zinc oxide slurry containing novel additive - Google Patents
Method for desulphurizing by zinc oxide slurry containing novel additive Download PDFInfo
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- CN103908886A CN103908886A CN201410134961.1A CN201410134961A CN103908886A CN 103908886 A CN103908886 A CN 103908886A CN 201410134961 A CN201410134961 A CN 201410134961A CN 103908886 A CN103908886 A CN 103908886A
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Abstract
The invention relates to a method for desulphurizing by zinc oxide slurry containing an additive formed by mixing alkanolamine, an inorganic salt and a surfactant. The method comprises the following steps: firstly, mixing water and zinc oxide to form zinc oxide slurry; then mixing the alkanolamine, the inorganic salt and the surfactant to form the zinc oxide slurry additive; adding the additive into the zinc oxide slurry to prepare the zinc oxide slurry containing the novel additive, and placing the slurry in a slurry circulating pond; introducing a to-be-treated gas containing sulfur dioxide into a booster fan for pressurizing; and introducing the pressurized gas into an absorbing tower bottom layer, making the pressurized gas react with the zinc oxide slurry downwards sprayed from an absorbing tower top to absorb sulfur dioxide, discharging the gas without the sulfur dioxide out from the absorbing tower top, and returning the zinc oxide slurry containing the sulfur dioxide to the slurry circulating pond. The method provided by the invention is simple, is low in cost, has a good effect of absorbing sulfur dioxide, ensures low viscosity of the zinc oxide slurry, is free from pollution, and can save resources and increase economic benefits.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to the zinc oxide slurries sulfur method that a kind of employing contains the additive being mixed into by alkanolamine, inorganic salts and surfactant.
Background technology
Sulfur dioxide, as one of main gas of atmosphere pollution, has caused people's extensive concern.Flue gas desulfurization is the effective ways that reduce sulphur emissions, the countries in the world desulfur technology that begins one's study from the 1950's, so far desulfur technology has reached kind more than 200, and main method has the multiple sulfur removal technologies such as wet desulphurization, semi-dry desulphurization, dry desulfurization, the desulfurization of rotary spraying and drying method, E-beam absorption.Use at present more generally limestone/lime method, soda method, renewable solvent absorption cycle and ammonia process both at home and abroad.
But for Lead And Zinc Smelter, these methods exist that raw material sources are difficult for, byproduct is disposed difficulty or processing cost and crossed the problems such as high.
Zinc oxide method is a kind of sulfur method for zinc smeltery flue gas, flue dust, waste residue and waste electrolyte that its raw material oxide powder and zinc can utilize zinc metallurgical process to produce make, for absorbing the sulfur dioxide gas of flue gas, generating product is zinc sulfite solid, zinc sulfate liquid or zinc sulfate solid.Zinc sulfite solid can be decomposed into zinc oxide and sulfur dioxide by adding thermal decomposition or acid, and zinc oxide returns and makees absorbent, and sulfur dioxide can be produced sulfuric acid or sulfur dioxide liquid processed; Also can zinc sulfite be oxidized to soluble zinc sulfate by oxidizing process, zinc sulfate liquid or the zinc sulfate solid obtaining by evaporative crystallization all can return to smelting shop and re-use.As can be seen here, this technology is combined closely sulfur removal technology and original smelting process, absorbent adopts the flue dust containing zinc oxide in factory, waste residue and waste electrolyte, the solution of zinc sulfate producing, solid slags etc. all can return to relevant workshop in factory and again utilize, the source of absorbent and the processing problem of product are well solved, reach the maximization of the utilization of resources, reduce circulating fund, reduce operating cost, but in actual application, find that the method exists assimilation effect poor, zinc oxide paste fluid viscosity is large, the problems such as easy obstruction, not only absorb and not exclusively can continue to cause environmental pollution, also can affect normal production simultaneously.
Summary of the invention
For solving the problems of the technologies described above, the invention provides that a kind of employing contains that the additive, the viscosity that are mixed into by alkanolamine, inorganic salts and surfactant are low, good absorbing effect, be not easy the zinc oxide slurries sulfur method that stops up, energy consumption is little, cost is low.
For achieving the above object, the technical solution used in the present invention is:
The zinc oxide slurries sulfur method that employing contains new additive agent, comprises the following steps:
(1) water, zinc oxide are mixed and made into zinc oxide slurries;
(2) alkanolamine, inorganic salts and surfactant are mixed into zinc oxide paste solution additive;
(3) additive of step (2) gained is added in the zinc oxide slurries of step (1) and make the zinc oxide slurries that contain new additive agent, and it is for subsequent use that the zinc oxide slurries that contain new additive agent are put into slurries circulatory pool;
(4) the pending gas that contains sulfur dioxide is passed into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the pending gas after pressurization enters the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 2.2-5.2, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
In described step (1), in zinc oxide slurries, the weight percentage of zinc oxide is 35%-75%.
In described step (2), the part by weight of alkanolamine, inorganic salts, surfactant is (1-2): (0.2-0.5): (0.5-1.5).
Described alkanolamine is one or both combination of triethanolamine or 2-amino-2-methyl-1-propanol.
Described inorganic salts are one or both combination of calcium chloride or sodium chloride.
Described surfactant is one or more the combination in neopelex, Tween 80, PEG 20000.
The weight of the mixture being made up of alkanolamine, inorganic salts and surfactant adding in zinc oxide slurries in described step (3) accounts for the 0.05%-0.5% of zinc oxide slurries gross weight.
Adopt after technique scheme, the beneficial effect that the present invention reaches is:
(1) alkanolamine of the present invention, inorganic salts and surfactant add to after mixing has increased contacting of flue gas and zinc oxide slurries in zinc oxide slurries, the oxidized zinc slurries of sulfur dioxide in flue gas are fully absorbed, thereby reach the object of thorough desulfurization;
(2) the present invention has reduced the viscosity of zinc oxide slurries by add the additive being made up of alkanolamine, inorganic salts and surfactant in zinc oxide slurries, has reduced sedimentation, has significantly improved zinc oxide slurries and has flowed, and has avoided the phenomenons such as obstruction.
Therefore, the inventive method is simple, pollution-free, cost is low, and the zinc oxide slurries that simultaneously contain the additive being made up of alkanolamine, inorganic salts and surfactant can significantly improve the assimilation effect of sulfur dioxide, reduces zinc oxide paste fluid viscosity, avoid the obstruction in production process, further reduce pollution, saved resource, improved economic benefit.
The specific embodiment
The invention will be further described by the following examples, its objective is in order to understand better content of the present invention, but it does not limit the scope of the invention.
embodiment 1
(1) first water and zinc oxide are mixed and made into zinc oxide slurries by weight the ratio that is 1:1;
(2) triethanolamine (TEA), sodium chloride (NaCl), Tween 80 are mixed and made into additive in the ratio of 1.2:0.4:0.5;
(3) additive of being made up of triethanolamine (TEA), sodium chloride (NaCl), Tween 80 is added and in zinc oxide slurries, made the flue gas desulfurization zinc oxide slurries that contain the additive being made up of triethanolamine (TEA), sodium chloride (NaCl), Tween 80 in 0.2% ratio of zinc oxide slurries gross weight, and the zinc oxide slurries containing additive are put into slurries circulatory pool;
(4) zinc smeltery is contained to SO
2concentration is 12000 mg/m
3flue gas pass into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the zinc smeltery after pressurization is containing SO
2concentration is 12000 mg/m
3flue gas enter the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries circulatory pool simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 2.2, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, after testing, SO in the gas after desulfurization
2content is 450 mg/m
3, the zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
Embodiment 2
(1) first water and zinc oxide are mixed and made into zinc oxide slurries by weight the ratio that is 1:0.54;
(2) by triethanolamine (TEA), calcium chloride (CaCl
2), PEG 20000 is in 2:0:5: 1.5 ratio is mixed and made into additive;
(3) will be by triethanolamine (TEA), calcium chloride (CaCl
2), the additive made of PEG 20000 adds in zinc oxide slurries and makes and contain by triethanolamine (TEA), calcium chloride (CaCl in 0.05% ratio of zinc oxide slurries gross weight
2), the flue gas desulfurization zinc oxide slurries of the additive of PEG 20000 composition, and the zinc oxide slurries that contain additive are put into slurries circulatory pool;
(4) zinc smeltery is contained to SO
2concentration is 10000 mg/m
3flue gas pass into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the zinc smeltery after pressurization is containing SO
2concentration is 10000 mg/m
3flue gas enter the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries circulatory pool simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 3.5, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, after testing, SO in the gas after desulfurization
2content is 200 mg/m
3, the zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
embodiment 3
(1) first water and zinc oxide are mixed and made into zinc oxide slurries by weight the ratio that is 1:3;
(2) by 2-amino-2-methyl-1-propanol, calcium chloride (CaCl
2), neopelex is mixed and made into additive in the ratio of 1:0.2:0.5;
(3) by 2-amino-2-methyl-1-propanol, calcium chloride (CaCl
2), the additive made of neopelex adds in zinc oxide slurries and makes and contain by 2-amino-2-methyl-1-propanol, calcium chloride (CaCl in 0.5% ratio of zinc oxide slurries gross weight
2), the flue gas desulfurization zinc oxide slurries of the additive of neopelex composition, and the zinc oxide slurries that contain additive are put into slurries circulatory pool;
(4) zinc smeltery is contained to SO
2concentration is 15000 mg/m
3flue gas pass into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the zinc smeltery after pressurization is containing SO
2concentration is 15000 mg/m
3flue gas enter the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries circulatory pool simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 4.5, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, after testing, SO in the gas after desulfurization
2content is 190mg/m
3, the zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
embodiment 4
(1) first water and zinc oxide are mixed and made into zinc oxide slurries by weight the ratio that is 1:2;
(2) by 2-amino-2-methyl-1-propanol (AMP), calcium chloride (CaCl
2), PEG 20000 is mixed and made into additive in the ratio of 2:0.3:1.2;
(3) by 2-amino-2-methyl-1-propanol (AMP), calcium chloride (CaCl
2), the additive made of PEG 20000 adds in zinc oxide slurries and makes and contain by 2-amino-2-methyl-1-propanol (AMP), calcium chloride (CaCl in 0.3% ratio of zinc oxide slurries gross weight
2), the flue gas desulfurization zinc oxide slurries of the additive of PEG 20000 composition, and the zinc oxide slurries that contain additive are put into slurries circulatory pool;
(4) zinc smeltery is contained to SO
2concentration is 12000 mg/m
3flue gas pass into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the zinc smeltery after pressurization is containing SO
2concentration is 12000 mg/m
3flue gas enter the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries circulatory pool simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 5.2, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, after testing, SO in the gas after desulfurization
2content is 180mg/m
3, the zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
Claims (7)
1. the zinc oxide slurries sulfur method that employing contains new additive agent, comprises the following steps:
(1) water, zinc oxide are mixed and made into zinc oxide slurries;
(2) alkanolamine, inorganic salts and surfactant are mixed into zinc oxide paste solution additive;
(3) additive of step (2) gained is added in the zinc oxide slurries of step (1) and make the zinc oxide slurries that contain new additive agent, and it is for subsequent use that the zinc oxide slurries that contain new additive agent are put into slurries circulatory pool;
(4) the pending gas that contains sulfur dioxide is passed into booster fan, compressor flow mates with gas flow, more than blast reaches 5000Pa;
(5) the pending gas after pressurization enters the bottom on the absorption tower of three layers of sieve plate, from bottom to top in flow process with squeeze into from slurries circulatory pool top, Bing Cong absorption tower, top, absorption tower downwards the zinc oxide slurries of spray react and absorb the sulfur dioxide pending gas, regulate the pH value of the zinc oxide slurries that spray in absorption tower by supplement a certain amount of zinc oxide slurries in slurries simultaneously, the pH value that makes zinc oxide slurries in absorption tower is 2.2-5.2, the gas of sloughing after sulfur dioxide is discharged by top, absorption tower, zinc oxide slurries after sulfur dioxide absorption return to slurries circulatory pool.
2. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: in described step (1), in zinc oxide slurries, the weight percentage of zinc oxide is 35%-75%.
3. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: in described step (2), the part by weight of alkanolamine, inorganic salts, surfactant is (1-2): (0.2-0.5): (0.5-1.5).
4. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: described alkanolamine is one or both combination of triethanolamine or 2-amino-2-methyl-1-propanol.
5. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: described inorganic salts are one or both combination of calcium chloride or sodium chloride.
6. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: described surfactant is one or more the combination in neopelex, Tween 80, PEG 20000.
7. the zinc oxide slurries sulfur method that a kind of employing according to claim 1 contains new additive agent, is characterized in that: the weight of the mixture being made up of alkanolamine, inorganic salts and surfactant adding in zinc oxide slurries in described step (3) accounts for the 0.05%-0.5% of zinc oxide slurries gross weight.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174281A (en) * | 2014-08-26 | 2014-12-03 | 山东瑞爱特环保科技有限公司 | Flue gas desulfurization synergistic agent and preparation method thereof |
| CN110559818A (en) * | 2019-09-27 | 2019-12-13 | 广东金宇环境科技有限公司 | Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer |
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| US6080281A (en) * | 1994-04-18 | 2000-06-27 | Attia; Yosry A. | Scrubbing of contaminants from contaminated air streams with aerogel materials with optional photocatalytic destruction |
| CN1531991A (en) * | 2003-03-18 | 2004-09-29 | 于文波 | Sulfur dioxide removing agent |
| CN102755826A (en) * | 2012-07-06 | 2012-10-31 | 江苏恒丰伟业科技工程有限公司 | Tail gas desulfuration adopting zinc oxide method in smelting industry |
| CN103316576A (en) * | 2013-05-14 | 2013-09-25 | 宜兴市化工成套设备有限公司 | Desulfurizing and demisting combined tower |
| CN103349901A (en) * | 2013-06-14 | 2013-10-16 | 中国恩菲工程技术有限公司 | Flue gas processing method and device thereof |
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2014
- 2014-04-04 CN CN201410134961.1A patent/CN103908886B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080281A (en) * | 1994-04-18 | 2000-06-27 | Attia; Yosry A. | Scrubbing of contaminants from contaminated air streams with aerogel materials with optional photocatalytic destruction |
| CN1531991A (en) * | 2003-03-18 | 2004-09-29 | 于文波 | Sulfur dioxide removing agent |
| CN102755826A (en) * | 2012-07-06 | 2012-10-31 | 江苏恒丰伟业科技工程有限公司 | Tail gas desulfuration adopting zinc oxide method in smelting industry |
| CN103316576A (en) * | 2013-05-14 | 2013-09-25 | 宜兴市化工成套设备有限公司 | Desulfurizing and demisting combined tower |
| CN103349901A (en) * | 2013-06-14 | 2013-10-16 | 中国恩菲工程技术有限公司 | Flue gas processing method and device thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174281A (en) * | 2014-08-26 | 2014-12-03 | 山东瑞爱特环保科技有限公司 | Flue gas desulfurization synergistic agent and preparation method thereof |
| CN110559818A (en) * | 2019-09-27 | 2019-12-13 | 广东金宇环境科技有限公司 | Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer |
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