CN101774620B - 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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- CN101774620B CN101774620B CN2009102642100A CN200910264210A CN101774620B CN 101774620 B CN101774620 B CN 101774620B CN 2009102642100 A CN2009102642100 A CN 2009102642100A CN 200910264210 A CN200910264210 A CN 200910264210A CN 101774620 B CN101774620 B CN 101774620B
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- calcium hydroxide
- calcium oxide
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- surface area
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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 at present environmental problem is obtained attracting worldwide attention, air pollution problems inherent, the discharging that especially reduces sulfur dioxide has not been a new task.China's sulfur dioxide 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 to be main primary energy consumption big country with coal.The direct burning of coal causes China's " coal-smoke pollution " (flue dust and sulfur dioxide) serious.Therefore implement flue gas desulfurization, reduce sulfur dioxide (SO2) emissions, with regard to social benefit, can improve air quality greatly, optimize ecological environment, improve people's quality of life, comprehensive edge effect is then more obvious.
Flue gas desulfurization generally can be divided into mode of operation: wet method, dry method (dry type sorbent injection doctor treatment) and spray drying process (or claiming semidry method) 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 rate of desulfurizing 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 equipment need not invest in the transformation of real estate, can make specific 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) lime stone and the anthracite of getting calcium oxide >=54% are by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory sieve; After crusher in crushing, get into digestion device again; Clear up water in the digestion device with spray state and calcium oxide effect, stir, guarantee that the calcium oxide hydration time was at 15-55 minute with 500 rev/mins of-1000 rev/mins of speed; Different according to the lime grey matter, 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 sieve, and screenings gets into grader, through regulating 500 rev/mins-1000 rev/mins of grader rotating speeds, coarse grain is not cleared up calcium oxide separate, and gained calcium hydroxide gets into the finished product warehouse;
4) sampling, the specific area of survey calcium hydroxide finished product on nitrogen absorption specific surface appearance;
In step 2) in the water of clearing up that adopts be organic amine, polyalcohol or the sodium carbonate that contains below 2.0%.
In step 2) in adopt one-level digestion device and two-stage digester; Remove coal ash through vibratory sieve earlier, after crusher in crushing, get into the one-level digestion device again, 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, different according to the lime grey matter, 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 clasfficiator gets into two-stage digester again, continued to clear up 30 minutes, mixing speed be controlled at 500 rev/mins-1000 rev/mins with guarantee that quick lime clears up fully.
In step 1) control calcium oxide the rate of burning till more than 95%, calcium oxide content >=95%.
The calcium oxide that calcining is good in step 1) is through step 2) in vibratory sieve remove coal ash, again through crusher in crushing, control the calcium oxide granularity in 5 millimeters.
The invention has the advantages that: the present invention is through changing the digestion process parameter; Through operating parameters such as control water-calcium ratio, digestion temperature, digestion time, charging rates; The specific area of calcium hydroxide is adjustable (optimizes porous; Reduce average grain diameter, improve the pore volume value), prepare specific 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 areas is provided, to reach the desulfurization instructions for use, reduce production costs again simultaneously.
The specific embodiment
Method for preparing high-specific surface area calcium hydroxide for dry desulphurization of the present invention comprises the steps:
1) lime stone and the anthracite of getting calcium oxide >=54% are by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory sieve; After crusher in crushing, get into digestion device again; Clear up water in the digestion device with spray state and calcium oxide effect, stir, guarantee that the calcium oxide hydration time was at 15-55 minute with 500 rev/mins of-1000 rev/mins of speed; Different according to the lime grey matter, 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 sieve, and screenings gets into grader, through regulating 500 rev/mins-1000 rev/mins of grader rotating speeds, coarse grain is not cleared up calcium oxide separate, and gained calcium hydroxide gets into the finished product warehouse;
4) sampling, the specific area of survey calcium hydroxide finished product on nitrogen absorption specific surface appearance;
In step 2) in the water of clearing up that adopts be organic amine, polyalcohol or the sodium carbonate that contains below 2.0%.
In step 2) in adopt one-level digestion device and two-stage digester; Remove coal ash through vibratory sieve earlier, after crusher in crushing, get into the one-level digestion device again, 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, different according to the lime grey matter, 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 clasfficiator gets into two-stage digester again, continued to clear up 30 minutes, mixing speed be controlled at 500 rev/mins-1000 rev/mins with guarantee that quick lime clears up fully.
In step 1) control calcium oxide the rate of burning till more than 95%, calcium oxide content >=95%.
The calcium oxide that calcining is good in step 1) is through step 2) in vibratory sieve remove coal ash, again through crusher in crushing, control the calcium oxide granularity in 5 millimeters.
Main points of the present invention are:
1) goes into digestion device by lime silo inflow electronics metering belt conveyer scale with water less than the quick lime of 5mm through flowmeter.
To fully stir, dissolve when 2) adding hydroxyl organic matter etc. in the water.
3) strict control digestion device charging rate, it is too high to prevent to digest temperature.
4) flowing into ager through the material of clearing up in advance further digests.
The present invention is in implementation process; Notice protection, have dust to escape operation to shaft kiln, screening, classification etc. and all dispose electrostatic precipitator or sack cleaner, particularly clear up operation and be provided with on digestion device top and close wind apparatus environment; 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 lime stone, advances digestion device quick lime granularity 3mm, the ratio of quick lime and water: 1: 0.47; The water temperature of digestion water is room temperature (about 25 ℃); 800 rev/mins of grader rotating speeds, gained calcium hydroxide is 95% through 250 mesh standard sieves, specific area is 12.06m
2/ g.
Embodiment 2
Calcium oxide content 54% in the lime stone; Advance digestion device quick lime granularity 3mm, the ratio of quick lime and water (digestion water contains a kind of organic amine 2%, sodium carbonate 1%): 1: 0.47; The water temperature of digestion water is room temperature (about 25 ℃); 800 rev/mins of grader rotating speeds, gained calcium hydroxide is 95% through 250 mesh standard sieves, specific area is 21.81m
2/ g.
Embodiment 3
Calcium oxide content 54% in the lime stone; Advance digestion device quick lime granularity 3mm, the ratio of quick lime and water (digestion water contains a kind of trihydroxylic alcohol 2%, sodium carbonate 1%): 1: 0.47; The water temperature of digestion water is room temperature (about 25 ℃); 800 rev/mins of grader rotating speeds, gained calcium hydroxide is 95% through 250 mesh standard sieves, specific area is 18.99.81m
2/ g.
Embodiment 4
Calcium oxide content 54% in the lime stone; Advance digestion device quick lime granularity 3mm, the ratio of quick lime and water (digestion water contains a kind of organic amine 1%, a kind of trihydroxylic alcohol 1%): 1: 0.47; The water temperature of digestion water is room temperature (about 25 ℃); 800 rev/mins of grader rotating speeds, gained calcium hydroxide is 95% through 250 mesh standard sieves, specific area is 30.83m
2/ g.
The foregoing description does not limit the present invention in any way, and every employing is equal to the technical scheme that replacement or the mode of equivalent transformation obtain and 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) lime stone and the anthracite of getting calcium oxide >=54% are by 1: the 0.07-0.1 weight ratio is calcined the generation calcium oxide;
2) remove coal ash through vibratory sieve; After crusher in crushing, get into digestion device again; Clear up water in the digestion device with spray state and calcium oxide effect, stir, guarantee that the calcium oxide hydration time was at 15-55 minute with 500 rev/mins of-1000 rev/mins of speed; Different according to the lime grey matter, 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 sieve, and screenings gets into grader, through regulating 500 rev/mins-1000 rev/mins of grader rotating speeds, coarse grain is not cleared up calcium oxide separate, and gained calcium hydroxide gets into the finished product warehouse;
4) sampling, the specific area of survey calcium hydroxide finished product on nitrogen absorption specific surface appearance;
It is characterized in that: in step 2) in the water of clearing up that adopts be organic amine, polyalcohol or the sodium carbonate that contains below 2.0%.
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 sieve earlier, after crusher in crushing, get into the one-level digestion device again, 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, different according to the lime grey matter, 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 clasfficiator gets into two-stage digester again, continued to clear up 30 minutes, mixing speed be controlled at 500 rev/mins-1000 rev/mins with guarantee that quick 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) control calcium oxide the rate of burning till 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 sieve removal coal ash; Through crusher in crushing, control calcium oxide granularity is in 5 millimeters again.
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| CN2009102642100A CN101774620B (en) | 2009-12-31 | 2009-12-31 | Method for preparing high-specific surface area calcium hydroxide for dry desulphurization |
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| CN2009102642100A CN101774620B (en) | 2009-12-31 | 2009-12-31 | Method for preparing high-specific surface area calcium hydroxide for dry desulphurization |
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| CN101774620B true CN101774620B (en) | 2012-02-22 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092755B (en) * | 2010-11-29 | 2013-03-27 | 华中科技大学 | Preparation method of Ca(OH)2 for desulfuration |
| CN103508478B (en) * | 2013-06-05 | 2016-08-24 | 池州灵芝化建材料科技有限公司 | A kind of method that precipitated calcium carbonate and active calcium oxide defect ware prepare calcium hydroxide |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| CN115073023B (en) * | 2022-07-13 | 2023-05-12 | 建德华明科技有限公司 | Preparation method of slaked lime for efficient desulfurization |
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