CN101774620A - Method for preparing high-specific surface area calcium hydroxide for dry desulphurization - Google Patents
Method for preparing high-specific surface area calcium hydroxide for dry desulphurization Download PDFInfo
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- CN101774620A CN101774620A CN200910264210A CN200910264210A CN101774620A CN 101774620 A CN101774620 A CN 101774620A CN 200910264210 A CN200910264210 A CN 200910264210A CN 200910264210 A CN200910264210 A CN 200910264210A CN 101774620 A CN101774620 A CN 101774620A
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- calcium hydroxide
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Abstract
The invention relates to a method for preparing high-specific surface area calcium hydroxide for dry desulphurization, which comprises the following steps of: (1) carrying out calcination on lime stone and anthracite to generate calcium oxide; (2) passing through a vibrating screen, breaking by a breaking machine, entering a digesting device and enabling water to act with the calcium oxide in a spraying state; (3) leading calcium hydroxide to pass through the vibrating screen and leading the obtained calcium hydroxide to enter a finished product storing bin; (4) sampling and measuring the specific surface area of a calcium hydroxide finished product on a nitrogen absorbing specific surface area instrument, wherein the digesting water adopted in the step (2) contains smaller than 2.0 percent of organic amine or/and polyalcohol/inorganic sodium salt. The specific surface area of the calcium hydroxide prepared by the method is adjustable, the calcium hydroxide with the specific surface area of 15-30m2/g is prepared, and the calcium hydroxide with different specific surface area is provided according to the composition of smoke to reach the use requirement of desulphurization; and meanwhile, the production cost is also reduced.
Description
Technical field
The present invention relates to the preparation method of calcium hydroxide, particularly a kind of method for preparing high-specific surface area calcium hydroxide for dry desulphurization.
Background technology
The attention that environmental problem is obtained attracting worldwide attention at present, air pollution problems inherent, the discharging that especially reduces sulfurous gas has not been a new task.China's sulfurous gas year total emission volumn has substantially exceeded the self-purification ability of enviroment, has caused nearly 1/3 territory acid rain pollution serious.Because China is the primary energy consumption big country based on coal.The direct burning of coal causes China's " coal-smoke pollution " (flue dust and sulfurous gas) serious.Therefore implement flue gas desulfurization, reduce sulfur dioxide emissions, with regard to social benefit, can improve Air quality greatly, optimize ecotope, improve people's quality of life, comprehensive edge effect is then more obvious.
Flue gas desulfurization generally can be divided into operating method: wet method, dry method (dry type sorbent injection doctor treatment) and spray-drying process (or claiming semidrying) three class methods.To dry-desulphurizer all is calcium hydroxide usually, the advantage of this method: simple to operate; Device takes up space little, and product is a solid, non-secondary pollution, and still, only the utilization ratio of sweetening agent is low.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low cost, efficient, and making simultaneously is simple, production unit need not invest in the transformation of real estate, can make specific surface area and reach 15-30m
2The method for preparing high-specific surface area calcium hydroxide for dry desulphurization of the calcium hydroxide of/g.
For reaching above-mentioned technical purpose, technical scheme of the present invention is: a kind of method for preparing high-specific surface area calcium hydroxide for dry desulphurization comprises the steps:
1) get the Wingdale of calcium oxide 〉=54% and hard coal by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory screening apparatus, after crusher in crushing, enter digestion device again, clear up water in the digestion device with spray state and calcium oxide effect, stir with 500 rev/mins of-1000 rev/mins of speed, guarantee that the calcium oxide hydration time was at 15-55 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8;
3) calcium hydroxide that comes out from digestion device passes through vibratory screening apparatus, and screen underflow enters grading machine, by regulating 500 rev/mins-1000 rev/mins of grading machine rotating speeds, coarse grain is not cleared up separation such as calcium oxide, and gained calcium hydroxide enters the finished product warehouse;
4) sampling, the specific surface area of survey calcium hydroxide finished product on nitrogen absorption specific surface instrument;
In step 2) in the water of clearing up that adopts be to contain organic amine below 2.0% or/and polyvalent alcohol/inorganic sodium.
In step 2) in adopt one-level digestion device and two-stage digester; Remove coal ash through vibratory screening apparatus earlier, enter the one-level digestion device again after crusher in crushing, water is with spray state and calcium oxide effect in the one-level digestion device; Stir with 500 rev/mins of-1000 rev/mins of speed, guarantee the calcium oxide hydration time at 15-25 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8; The meal of the calcium hydroxide that comes out from the one-level classifier enters two-stage digester again, continued to clear up 30 minutes, stirring velocity be controlled at 500 rev/mins-1000 rev/mins with guarantee that unslaked lime clears up fully.
The rate of burning till of controlled oxidation calcium is more than 95% in step 1), calcium oxide content 〉=95%.
The calcium oxide that calcining is good in step 1) is through step 2) in vibratory screening apparatus removal coal ash, again through crusher in crushing, controlled oxidation calcium granularity is in 5 millimeters.
The invention has the advantages that: the present invention is by changing the digestion process parameter, by operating parameterss such as control water-calcium ratio, digestion temperature, digestion time, input speeds, the specific surface area of calcium hydroxide is adjustable (optimizes porousness, reduce median size, improve the pore volume value), prepare specific surface area and reach 15-30m
2The calcium hydroxide of/g.According to the composition of flue gas, the calcium hydroxide of different big or small specific surface areas is provided, to reach the desulfurization service requirements, reduce production costs again simultaneously.
Embodiment
Method for preparing high-specific surface area calcium hydroxide for dry desulphurization of the present invention comprises the steps:
1) get the Wingdale of calcium oxide 〉=54% and hard coal by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory screening apparatus, after crusher in crushing, enter digestion device again, clear up water in the digestion device with spray state and calcium oxide effect, stir with 500 rev/mins of-1000 rev/mins of speed, guarantee that the calcium oxide hydration time was at 15-55 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8;
3) calcium hydroxide that comes out from digestion device passes through vibratory screening apparatus, and screen underflow enters grading machine, by regulating 500 rev/mins-1000 rev/mins of grading machine rotating speeds, coarse grain is not cleared up separation such as calcium oxide, and gained calcium hydroxide enters the finished product warehouse;
4) sampling, the specific surface area of survey calcium hydroxide finished product on nitrogen absorption specific surface instrument;
In step 2) in the water of clearing up that adopts be to contain organic amine below 2.0% or/and polyvalent alcohol/inorganic sodium.
In step 2) in adopt one-level digestion device and two-stage digester; Remove coal ash through vibratory screening apparatus earlier, enter the one-level digestion device again after crusher in crushing, water is with spray state and calcium oxide effect in the one-level digestion device; Stir with 500 rev/mins of-1000 rev/mins of speed, guarantee the calcium oxide hydration time at 15-25 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8; The meal of the calcium hydroxide that comes out from the one-level classifier enters two-stage digester again, continued to clear up 30 minutes, stirring velocity be controlled at 500 rev/mins-1000 rev/mins with guarantee that unslaked lime clears up fully.
The rate of burning till of controlled oxidation calcium is more than 95% in step 1), calcium oxide content 〉=95%.
The calcium oxide that calcining is good in step 1) is through step 2) in vibratory screening apparatus removal coal ash, again through crusher in crushing, controlled oxidation calcium granularity is in 5 millimeters.
Main points of the present invention are:
1) goes into digestion device by lime silo inflow electronics metering weighing belt with water less than the unslaked lime of 5mm through under meter.
To fully stir, dissolve when 2) adding hydroxyl organism etc. in the water.
3) strict control digestion device input speed, it is too high to prevent to digest temperature.
4) inflow of the material through clearing up in advance ager further digests.
The present invention is in implementation process; notice protection to environment; there is dust to escape operation to shaft kiln, screening, classification etc. and all disposes electrostatic precipitator or sack cleaner; particularly clearing up operation is provided with on digestion device top and closes wind apparatus; safeguards system is with outside isolated; thereby form intrasystem negative-pressure operation, ensure that operation is clean, no dust pollution.
Embodiment 1
Calcium oxide content 54% in the Wingdale, advances digestion device unslaked lime granularity 3mm, the ratio of unslaked lime and water: 1: 0.47, the water temperature of digestion water is room temperature (about 25 ℃), 800 rev/mins of grading machine rotating speeds, gained calcium hydroxide is 95% by 250 mesh standard sieves, specific surface area is 12.06m
2/ g.
Embodiment 2
Calcium oxide content 54% in the Wingdale, advance digestion device unslaked lime granularity 3mm, (digestion water contains a kind of organic amine 2% for unslaked lime and water, yellow soda ash 1%) ratio: 1: 0.47, the water temperature of digestion water is room temperature (about 25 ℃), 800 rev/mins of grading machine rotating speeds, gained calcium hydroxide is 95% by 250 mesh standard sieves, specific surface area is 21.81m
2/ g.
Embodiment 3
Calcium oxide content 54% in the Wingdale, advance digestion device unslaked lime granularity 3mm, (digestion water contains a kind of trivalent alcohol 2% for unslaked lime and water, yellow soda ash 1%) ratio: 1: 0.47, the water temperature of digestion water is room temperature (about 25 ℃), 800 rev/mins of grading machine rotating speeds, gained calcium hydroxide is 95% by 250 mesh standard sieves, specific surface area is 18.99.81m
2/ g.
Embodiment 4
Calcium oxide content 54% in the Wingdale, advance digestion device unslaked lime granularity 3mm, (digestion water contains a kind of organic amine 1% for unslaked lime and water, a kind of trivalent alcohol 1%) ratio: 1: 0.47, the water temperature of digestion water is room temperature (about 25 ℃), 800 rev/mins of grading machine rotating speeds, gained calcium hydroxide is 95% by 250 mesh standard sieves, specific surface area is 30.83m
2/ g.
The foregoing description does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (4)
1. a method for preparing high-specific surface area calcium hydroxide for dry desulphurization comprises the steps:
1) get the Wingdale of calcium oxide 〉=54% and hard coal by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory screening apparatus, after crusher in crushing, enter digestion device again, clear up water in the digestion device with spray state and calcium oxide effect, stir with 500 rev/mins of-1000 rev/mins of speed, guarantee that the calcium oxide hydration time was at 15-55 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8;
3) calcium hydroxide that comes out from digestion device passes through vibratory screening apparatus, and screen underflow enters grading machine, by regulating 500 rev/mins-1000 rev/mins of grading machine rotating speeds, coarse grain is not cleared up separation such as calcium oxide, and gained calcium hydroxide enters the finished product warehouse;
4) sampling, the specific surface area of survey calcium hydroxide finished product on nitrogen absorption specific surface instrument;
It is characterized in that: in step 2) in the water of clearing up that adopts be to contain organic amine below 2.0% or/and polyvalent alcohol/yellow soda ash.
2. method for preparing high-specific surface area calcium hydroxide for dry desulphurization according to claim 1 is characterized in that: in step 2) in adopt one-level digestion device and two-stage digester; Remove coal ash through vibratory screening apparatus earlier, enter the one-level digestion device again after crusher in crushing, water is with spray state and calcium oxide effect in the one-level digestion device; Stir with 500 rev/mins of-1000 rev/mins of speed, guarantee the calcium oxide hydration time at 15-25 minute, according to lime grey matter difference, the mass ratio of water and calcium oxide is controlled at the scope of 0.4-0.8; The meal of the calcium hydroxide that comes out from the one-level classifier enters two-stage digester again, continued to clear up 30 minutes, stirring velocity be controlled at 500 rev/mins-1000 rev/mins with guarantee that unslaked lime clears up fully.
3. method for preparing high-specific surface area calcium hydroxide for dry desulphurization according to claim 1 is characterized in that: in step 1) the rate of burning till of controlled oxidation calcium more than 95%, calcium oxide content 〉=95%.
4. method for preparing high-specific surface area calcium hydroxide for dry desulphurization according to claim 1, it is characterized in that: the calcium oxide that calcining is good in step 1) is through step 2) in vibratory screening apparatus removal coal ash, through crusher in crushing, controlled oxidation calcium granularity is in 5 millimeters again.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092755A (en) * | 2010-11-29 | 2011-06-15 | 华中科技大学 | Preparation method of Ca(OH)2 for desulfuration |
| CN103508478A (en) * | 2013-06-05 | 2014-01-15 | 池州灵芝化建材料科技有限公司 | Method used for preparing calcium hydroxide from light calcium carbonate and active calcium oxide defective products |
| CN104192881A (en) * | 2014-08-06 | 2014-12-10 | 华南理工大学 | Method for preparing multipurpose solid waste slag by using return sand and return stone and application of solid waste slag |
| CN104817101A (en) * | 2015-04-08 | 2015-08-05 | 常熟市宏宇钙化物有限公司 | Calcium oxide powder preparation method |
| CN104860343A (en) * | 2015-04-08 | 2015-08-26 | 常熟市宏宇钙化物有限公司 | Preparation method of calcium hydroxide powder |
| CN106746763A (en) * | 2016-12-05 | 2017-05-31 | 南京格暠环保科技有限公司 | A kind of preparation method of dry production modified food level calcium hydroxide |
| CN109052608A (en) * | 2018-08-07 | 2018-12-21 | 米易东立矿业有限公司 | Sulfuric acid method titanium pigment waste water treating agent and preparation method thereof |
| CN109607588A (en) * | 2019-01-30 | 2019-04-12 | 湖南长乐新材料有限公司 | A kind of technical grade calcium hydroxide production device and its production technology |
| CN111807402A (en) * | 2020-06-22 | 2020-10-23 | 浙江布石新材料有限公司 | Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste |
| CN112174179A (en) * | 2019-08-09 | 2021-01-05 | 浙江天石纳米科技股份有限公司 | Industrial preparation method of high-reactivity nano calcium hydroxide powder |
| CN112403506A (en) * | 2020-10-17 | 2021-02-26 | 中海油天津化工研究设计院有限公司 | Novel dry-process cement kiln efficient catalytic desulfurization material and production method thereof |
| CN113385027A (en) * | 2021-08-17 | 2021-09-14 | 佛山赛因迪环保科技有限公司 | Desulfurizing agent and preparation method and application thereof |
| CN115073023A (en) * | 2022-07-13 | 2022-09-20 | 建德华明科技有限公司 | Preparation method of hydrated lime for efficient desulfurization |
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2009
- 2009-12-31 CN CN2009102642100A patent/CN101774620B/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092755A (en) * | 2010-11-29 | 2011-06-15 | 华中科技大学 | Preparation method of Ca(OH)2 for desulfuration |
| CN102092755B (en) * | 2010-11-29 | 2013-03-27 | 华中科技大学 | Preparation method of Ca(OH)2 for desulfuration |
| CN103508478A (en) * | 2013-06-05 | 2014-01-15 | 池州灵芝化建材料科技有限公司 | Method used for preparing calcium hydroxide from light calcium carbonate and active calcium oxide defective products |
| CN104192881A (en) * | 2014-08-06 | 2014-12-10 | 华南理工大学 | Method for preparing multipurpose solid waste slag by using return sand and return stone and application of solid waste slag |
| CN104817101A (en) * | 2015-04-08 | 2015-08-05 | 常熟市宏宇钙化物有限公司 | Calcium oxide powder preparation method |
| CN104860343A (en) * | 2015-04-08 | 2015-08-26 | 常熟市宏宇钙化物有限公司 | Preparation method of calcium hydroxide powder |
| CN104860343B (en) * | 2015-04-08 | 2017-01-11 | 常熟市宏宇钙化物有限公司 | Preparation method of calcium hydroxide powder |
| CN106746763A (en) * | 2016-12-05 | 2017-05-31 | 南京格暠环保科技有限公司 | A kind of preparation method of dry production modified food level calcium hydroxide |
| CN109052608A (en) * | 2018-08-07 | 2018-12-21 | 米易东立矿业有限公司 | Sulfuric acid method titanium pigment waste water treating agent and preparation method thereof |
| CN109052608B (en) * | 2018-08-07 | 2022-08-30 | 米易东立矿业有限公司 | Sulfuric acid method titanium dioxide wastewater treating agent and preparation method thereof |
| CN109607588A (en) * | 2019-01-30 | 2019-04-12 | 湖南长乐新材料有限公司 | A kind of technical grade calcium hydroxide production device and its production technology |
| CN112174179A (en) * | 2019-08-09 | 2021-01-05 | 浙江天石纳米科技股份有限公司 | Industrial preparation method of high-reactivity nano calcium hydroxide powder |
| CN112174179B (en) * | 2019-08-09 | 2022-05-10 | 浙江天石纳米科技股份有限公司 | Industrial preparation method of high-reactivity nano calcium hydroxide powder |
| CN111807402A (en) * | 2020-06-22 | 2020-10-23 | 浙江布石新材料有限公司 | Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste |
| CN111807402B (en) * | 2020-06-22 | 2022-06-17 | 浙江布石新材料有限公司 | Preparation method of high-specific-surface-area calcium hydroxide for treating incineration waste |
| CN112403506A (en) * | 2020-10-17 | 2021-02-26 | 中海油天津化工研究设计院有限公司 | Novel dry-process cement kiln efficient catalytic desulfurization material and production method thereof |
| CN113385027A (en) * | 2021-08-17 | 2021-09-14 | 佛山赛因迪环保科技有限公司 | Desulfurizing agent and preparation method and application thereof |
| CN115073023A (en) * | 2022-07-13 | 2022-09-20 | 建德华明科技有限公司 | Preparation method of hydrated lime for efficient desulfurization |
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