CN106622137A - Production method of adsorbent for removing mercury from flue gas - Google Patents

Production method of adsorbent for removing mercury from flue gas Download PDF

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CN106622137A
CN106622137A CN201710002742.1A CN201710002742A CN106622137A CN 106622137 A CN106622137 A CN 106622137A CN 201710002742 A CN201710002742 A CN 201710002742A CN 106622137 A CN106622137 A CN 106622137A
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flue gas
production method
mercury
adsorbent
inert atmosphere
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左宋林
刘军利
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Nanjing Forestry University
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Nanjing Forestry University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds

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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

The invention discloses a production method of an adsorbent for removing mercury from flue gas. The production method comprises the steps: rising temperature to be 250 DEG C at the speed of 1 to 2 DEG C/min under the inert atmosphere by taking a solid matter, which is obtained by dehydrating industrial pulping black liquid, as a raw material, preserving heat for 1 to 2 hours, raising temperature to be 600 to 850 DEG C at the speed of 5 to 10 DEG C/min, carbonizing for 1 to 3 hours, cooling under the inert atmosphere and taking out the material; and washing the product, which is obtained by cooling, with water for 1 to 2 times, drying and crushing to prepare the adsorbent for removing the mercury from the flue gas. The mercury adsorption amount of the adsorbent product prepared by the production method is more than 10 times that of the common activated carbon. According to the production method, the raw materials are rich in source and low in price, the adopted process is very simple and practical, the adsorbent product special for mercury removal with the price much lower than that of the previous mercury-removing activated carbon can be produced, and the requirements of industrialized application can be met completely.

Description

A kind of production method of flue gas demercuration adsorbent
Technical field
The invention belongs to chemical production technical field, and in particular to a kind of removing mercury in flue gas metal and its compound it is special With the production method of adsorbent.
Background technology
With using in a large number for world energy sources, the continuous construction in world thermal power plant, the whole world is every year because firepower is sent out In flue gas produced by a large amount of burnings of power plant's coal, it is estimated that the gaseous mercury metal being discharged into every year in air is reached more than 1470 Ton.Mercury has very big bio-toxicity, and the health and existence to the mankind and other biological causes very big harm.Mercury in flue gas is dirty Dye be sulfur-containing compound and nitrogen-containing compound in flue gas another severe contamination problem.Therefore, mercury pollution is universally acknowledged It is the another big pollution problem after sulphur pollution, by increasing concern and attention in the world.Europe and North America etc. are sent out Having launched respectively up to country reduces the discharge standard of mercury.For example, US President's " cleaning sky plan " is proposed mercury by 2018 Discharge reduces 69%, US Coal-fired Power Plants is started for the first time in the face of mercury emissions control problem, and Ministry of Energy (DOE) have selected 8 for this The pilot project of Xiang Xin, studies the mercury emissions control technology of power plant.China is no exception, the mercury emissions in current thermal power plant and its Improvement is also highly valued.
Mercury in Discharged form Coal Combustion to air includes gaseous elemental mercury and compound state mercury.The removing of mercury in flue gas also has more Research report, such as VIDIC R D, Carbon, 2001,39 (1):3-14；PAVLISH J H,Fuel Processing Technology,2003,82(2):89-165；P.Bihter,Carbon,2009,47:2855-2864.At present development more into Ripe mercury treatment technology is acticarbon removal method, i.e., de- to reach flue gas to the suction-operated of gaseous mercury using activated carbon The purpose of mercury.However, due to the demercuration ability of normal activated carbon it is all weaker, so generally using load elemental sulfur or compound state The mode of sulphur is improving the demercuration ability of activated carbon.Existing some patents provide related technology, such as patent US4500327A, CN1148079A.But what is adopted at present carries the relatively costly shortcoming of sulphur mercury control activated carbon generally existing.Especially flue gas demercuration is led In domain, because the exhaust gas volumn that thermal power plant produces daily is very big, therefore the yield of the activated carbon required for demercuration is very high, And the mercury control activated carbon for being used at present is generally required for loading elemental sulfur or compound state sulphur, it means that from preparing activated carbon Raw material sets out, and is required for two sets of processing steps, i.e., produce activated carbon first, is then loaded again, undoubtedly can greatly increase The cost of mercury control activated carbon, is that the realization of popularization and the demercuration requirement of mercury control activated carbon is all greatly affected.Under this case, Inventing simple technique and preparing the flue gas demercuration adsorbent with higher demercuration ability becomes the pass of demercuration technology application Key.
The content of the invention
The technical problem to be solved is to provide a kind of Low-cost production method of flue gas demercuration Special adsorbent. The method be using the solid content of black liquor of pulp making as raw material, under an inert atmosphere by simple heating, washing, drying can Obtain the powdered activated carbon product with higher demercuration ability.The abundant raw material source of the method, cheap, method are simply easy OK, it is that a kind of utilization discarded object produces the production method having compared with high value added product.
Flue gas demercuration adsorbent is to solve above-mentioned technical problem, and the technical solution used in the present invention is as follows：
A kind of production method of flue gas demercuration Special adsorbent, comprises the steps：
(1) solid content for obtaining black liquor of pulp making dehydration, in an inert atmosphere, with the ramp of 1～5 DEG C/min extremely 250 DEG C, 1-2h is incubated, then with the ramp of 5～10 DEG C/min to 600-850 DEG C, carbonizes 1-3h, it is cold under an inert atmosphere But take out afterwards；
(2) products in water obtained after cooling is washed 1-2 time, is dried, crushes prepared flue gas demercuration adsorbent.
In step (1), described black liquor of pulp making is obtained for softwood, broadleaf, bamboo wood or grass raw material Jing chemical pulpings To black liquor in one or more mixing.
Described chemical pulping is alkaline process or sulphite slurrying.
In step (1), described inert atmosphere is nitrogen or argon inert atmosphere.
In step (1), described charing is carried out in nitrogen or argon inert atmosphere, and carbonization temperature is at 700-850 DEG C Between.
In step (1), described intensification is, 250 DEG C before using the heating rates of 1～2 DEG C/min, and 250 DEG C are then adopted With the heating rate of 5-8 DEG C/min.
In step (2), the number of times of described products in water washing is 2 times.
In step (2), described flue gas demercuration adsorbent is powdery.
In step (1), in an inert atmosphere, with the ramp of 1-2 DEG C/min to 250 DEG C, be incubated 2h, then with 5 DEG C/ The ramp of min carbonizes 1-2h to 750-850 DEG C, takes out after cooling down under an inert atmosphere.
Black liquor of pulp making is in traditional pulping and papermaking processes, timber or the biomass material such as bamboo wood and other grass with The discarded object obtained after fiber is isolated in the chemical reagent boiling such as sulphite or vulcanized sodium and NaOH.These discarded objects Jing The solid content of its brownish black is obtained after dehydration, wherein mainly containing lignin, silica and alkali, sulfide.Profit of the invention Demercuration carbonaceous adsorbent is prepared with the inorganic matter in black liquor of pulp making and the direct step charring of lignin, black liquor need not have both been separated In inorganic matter and lignin, it is not required that directly add other activators, or through carbonizing and activating two steps.The method , used as the activator for preparing activated carbon, lignin provides carbon source, and silica exists for NaOH, sulfide etc. by the use of in solid content Also porous material can be formed under high temperature, alkalescence condition, presence of the sulfide in activated carbon can greatly improve activated carbon Demercuration ability, so as to prepare cheap, superior in quality flue gas demercuration adsorbent product, turn waste into wealth.
Beneficial effect：Compared with prior art, flue gas demercuration adsorbent of the present invention is by the direct charcoal of black liquor of pulp making solid content The activated carbon of metaplasia output, is being the mercurous of 2.45ug/L (being obtained by 60 DEG C of liquid elemental mercury volatilization) containing mercury concentration In air-flow (nitrogen is carrier gas), under 80 DEG C of adsorption temp, activated carbon reaches 35mg/g to the adsorbance of mercury vapour, and it compares table Area is 627m2/g.With the demercuration ability more much higher than normal activated carbon, the demercuration ability of sulfur loading active carbon is basically reached, It is a kind of cheap flue gas demercuration adsorbent product.The activated carbon compared with conventional activated carbon, with less specific surface Product, is unfavorable for the use of common activated carbon application occasion, and in the occasion of flue gas demercuration, but obtains with higher than normal activated carbon Many demercuration abilities, and the demercuration ability for carrying sulphur special-purpose active carbon for removing mercury can be basically reached, and its price is significantly less than load sulphur and takes off Mercury activated carbon, can be completely applied to actual flue gas demercuration occasion.
Specific embodiment
According to following embodiments, the present invention may be better understood.However, as it will be easily appreciated by one skilled in the art that real Apply the specific material proportion described by example, process conditions and its result and be merely to illustrate the present invention, and also will not should not limit The present invention described in detail in claims processed.
In order to more preferably illustrate the advantage of the demercuration adsorbent prepared by the technology of the present invention, using common cocoanut active charcoal and its The cocoanut active charcoal after sulphur is carried as the comparative example of the demercuration adsorbent prepared by example below, and is surveyed after the same method Try their specific surface area and carry the specific surface area after sulphur and mercury simple substance vapor sorption amount with demercuration ability.
Common cocoanut active charcoal is the commercial activated carbons that certain enterprise provides, and is produced using vapor activation, ground To more than 200 mesh, use for analysis.
Sulfur loading active carbon is to carry sulphur using above-mentioned common cocoanut active charcoal Jing to prepare.It carries sulphur technique：Activated carbon It is 9 with the mass ratio of sulphur:1,350 DEG C are warming up in a nitrogen atmosphere, 2 hours are incubated, then it is obtained in a nitrogen atmosphere and carries Sulphur activated carbon, according to elementary analysis result, its sulfur content reaches 10.7%.
The specific surface area of the demercuration adsorbent prepared by normal activated carbon, sulfur loading active carbon and embodiment is according to nitrogen Adsorption isotherm is calculated.The fundamental analysis condition of nitrogen adsorption isotherm is：Before determining adsorption, sample is at 250 DEG C Degassing 8h, using model Autosorb-iQ2The adsorption instrument of (Quantanchrome companies of the U.S.) determination sample under 77K Nitrogen adsorption isotherm.The sample specific surface area of activated carbon is calculated according to Brunauer Emmet Teller (BET) equations.
Demercuration adsorbent prepared by normal activated carbon, sulfur loading active carbon and embodiment is to mercury simple substance vapor sorption amount Analysis method is as follows：Using Dynamic gas-mixing and adsorption devices, the prepared activated carbon of test, in 2.45ug/L (by 60 DEG C of liquid elemental Mercury volatilization is obtained) mercurous air-flow (nitrogen is carrier gas) in, under 80 DEG C of adsorption temp, Dynamic Adsorption mercury simple substance penetrates song Line, according to the time of break-through of breakthrough curve and the concentration of mercury vapour the suction of activated carbon or adsorbent to mercury simple substance steam is calculated Attached amount.
The normal activated carbon as a comparison case of table 1 and the specific surface area of sulfur loading active carbon and the adsorbance of elemental mercury
Sample Business cocoanut active charcoal Carry sulphur business cocoanut active charcoal
Sulfur content, % 0.436 8.7
Specific surface area, m2/g 1045 947
Specific surface area, m2/ g mercury simple substance vapor sorption amounts, mg/g 3.0 31.7
Embodiment 1
, as raw material, the raw material has for the solid content that obtained with the black liquor dehydration that the sulphite slurrying of softwood pine tree is produced Machine thing content is 71%, and inorganic content is 29%, using different technological parameters, is prepared for three kinds of adsorbent product SPC-1, SPC-2, SPC-3.
The preparation process of product SPC-1 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 1 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 5 DEG C/min to 800 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product SPC-2 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 5 DEG C/min to 700 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product SPC-3 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 5 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 8 DEG C/min to 800 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
According to said method, the specific surface area and mercury simple substance vapor sorption amount of adsorbent are analyzed, it the results are shown in Table shown in 2.
The yield of the adsorbent prepared by the embodiment 1 of table 2, specific surface area and mercury simple substance vapor sorption amount
Compare Tables 1 and 2, it can be seen that adopt the solid content of sulphite black liquor of pulp making of softwood pine tree for raw material, Adsorbent with preferable mercury simple substance vapor sorption ability can be obtained by charing at 700-800 DEG C.Prepared by embodiment 1 Adsorbent although its specific surface area is significantly lower than normal activated carbon, be also significantly less than sulfur loading active carbon, but its mercuryvapour is inhaled Attached amount is more than ten times of normal activated carbon, and the mercuryvapour adsorbance of sample segment exceedes sulfur loading active carbon.Show, grass reed Alkaline pulping black liquor through charing can just prepare the demercuration adsorbent with using value.Prepared by comparing embodiment 1 Three samples can be seen that compared with the sample of 700 DEG C of carbonization temperatures, and the sample of 800 DEG C of charing preparations has higher ratio table Area and mercury vapour adsorbance；Comparative sample SPC-1 and SPC-3 can be seen that higher heating rate and reduce product yield, But while it is unfavorable for development and the adsorbance of the adsorbent to mercury simple substance steam of its hole
Embodiment 2
The solid content for obtaining is dehydrated as raw material with the black liquor that the soda pulping process of grass reed is produced, the organic matter of the raw material Content is 63%, and inorganic content is 37%, using different technological parameters, is prepared for three kinds of activated carbon product LBC-1, LBC- 2, LBC-3.
The preparation process of product LBC-1 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 1 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 5 DEG C/min to 850 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product LBC-2 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 7 DEG C/min to 800 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product LBC-3 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 5 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 8 DEG C/min to 750 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
According to said method, the specific surface area and mercury simple substance vapor sorption amount of adsorbent are analyzed, it the results are shown in Table shown in 3.
The yield of the adsorbent prepared by the embodiment 2 of table 3, specific surface area and mercury simple substance vapor sorption amount
Product Yield, % Specific surface area, m2/g Mercury simple substance vapor sorption amount, mg/g
LBC-1 27 693 30
LBC-2 33 605 27
LBC-3 35 601 21
Comparison sheet 1 and table 3, it can be seen that adopt the solid content of alkaline pulping black liquor of grass reed for raw material, pass through The product for obtaining is carbonized at 750-850 DEG C, although its specific surface area is significantly lower than normal activated carbon, load sulphur is also significantly less than and is lived Property charcoal, but its mercuryvapour adsorbance is 7-10 times of normal activated carbon, the mercuryvapour adsorbance of LBC-1 and connecing for sulfur loading active carbon Closely.Show, the alkaline pulping black liquor of grass reed can just prepare the demercuration adsorbent with using value through charing.Than Carbonization temperature is can be seen that compared with three samples prepared by embodiment 2 there is the mercuryvapour adsorbance of prepared adsorbent More significant impact, can prepare the adsorbent of higher mercury vapour adsorbance at 850 DEG C.
Embodiment 3
The solid content for obtaining is dehydrated as raw material with the black liquor that the soda pulping process of bamboo wood is produced, the content of organics of the raw material is 65%, inorganic content is 35%, using different technological parameters, is prepared for three kinds of activated carbon product ZBC-1, ZBC-2, ZBC- 3。
The preparation process of product ZBC-1 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 1 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 7 DEG C/min to 850 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product ZBC-2 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 7 DEG C/min to 800 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product ZBC-3 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 5 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 8 DEG C/min to 700 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 1 time is washed with deionized, finally product is dried to obtain at 120 DEG C.
According to said method, the specific surface area and mercury simple substance vapor sorption amount of adsorbent are analyzed, it the results are shown in Table shown in 4.
The yield of the adsorbent prepared by the embodiment 4 of table 4, specific surface area and mercury simple substance vapor sorption amount
Product Yield, % Specific surface area, m2/g Mercury simple substance vapor sorption amount, mg/g
ZBC-1 29 721 31
ZBC-2 34 642 24
ZBC-3 36 594 22
Comparison sheet 1 and table 4, it can be seen that the alkaline pulping black liquor solid content of bamboo wood is adopted for raw material, by 700-850 The product for obtaining is carbonized at DEG C, although its specific surface area is significantly lower than normal activated carbon, sulfur loading active carbon is also significantly less than, Its mercuryvapour adsorbance is 7-10 times of normal activated carbon, and the mercuryvapour adsorbance of ZBC-1 is with sulfur loading active carbon closely. Show, the alkaline pulping black liquor solid content of bamboo wood can just prepare the demercuration adsorbent with using value through charing.
Embodiment 4
According to 1：1 quality than two kinds of raw materials that mix embodiment 1 and embodiment 2 are used, using this mixed material, Using different technological parameters, three kinds of activated carbon product SLC-1, SLC-2, SLC-3 are prepared for.
The preparation process of product SLC-1 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 5 DEG C/min to 850 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product SLC-2 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 7 DEG C/min to 700 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product SLC-3 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 5 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 8 DEG C/min to 600 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
According to said method, the specific surface area and mercury simple substance vapor sorption amount of adsorbent are analyzed, it the results are shown in Table shown in 5.
The yield of the adsorbent prepared by the embodiment 4 of table 5, specific surface area and mercury simple substance vapor sorption amount
Comparison sheet 1 and table 5, it can be seen that using sulphite black liquor of pulp making and the grass reed of softwood pine tree The solid content of alkaline pulping black liquor is raw material, by carbonizing the product for obtaining at 600-850 DEG C, although its specific surface area is notable Less than normal activated carbon, sulfur loading active carbon is also significantly less than, but its mercuryvapour adsorbance is 6-11 times of normal activated carbon, SLC- 1 mercuryvapour adsorbance exceedes sulfur loading active carbon.Show, both slurrying night mixtures can also be prepared with using value Demercuration adsorbent.But after mixing, its mercury vapour adsorbance is not obviously improved, although specific surface area has increased slightly.Equally, The mercury vapour adsorbance of the sample prepared by comparing embodiment 4 can be seen that carbonization temperature be affect its demercuration ability it is main Preparation condition.
Embodiment 5
According to 1：1 quality than two kinds of raw materials that mix embodiment 2 and embodiment 3 are used, using this mixed material, Using different technological parameters, three kinds of activated carbon product LBC-1, LBC-2, LBC-3 are prepared for.
The preparation process of product LBC-1 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 5 DEG C/min to 800 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product LBC-2 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 2 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 7 DEG C/min to 700 DEG C, 1h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
The preparation process of product LBC-3 is：100g raw materials are taken, nitrogen inert gas is passed through, with the speed of 5 DEG C/min 250 DEG C are warming up to, 2h is incubated, then with the ramp of 8 DEG C/min to 600 DEG C, 2h is incubated, are finally cooled in nitrogen Less than 100 DEG C are taken out.Carbonizing production 2 times is washed with deionized, finally product is dried to obtain at 120 DEG C.
According to said method, the specific surface area and mercury simple substance vapor sorption amount of adsorbent are analyzed, it the results are shown in Table shown in 6.
The yield of the adsorbent prepared by the embodiment 5 of table 6, specific surface area and mercury simple substance vapor sorption amount
Comparison sheet 1 and table 6, it can be seen that black using the alkaline pulping black liquor of grass reed and the soda pulping process of bamboo wood The solid content of liquid is raw material, by carbonizing the product for obtaining at 600-850 DEG C, although its specific surface area is significantly lower than common living Property charcoal, is also significantly less than sulfur loading active carbon, but its mercuryvapour adsorbance is 5-10 times of normal activated carbon, the mercuryvapour of LBC-1 Adsorbance is close to sulfur loading active carbon.Show, both slurrying night mixtures can also prepare de- with using value Mercury absorbent.Equally, it is to affect it that the mercury vapour adsorbance of the sample prepared by comparing embodiment 4 can be seen that carbonization temperature The main preparation condition of demercuration ability.
Adsorbent prepared by Integrated comparative above embodiment and normal activated carbon, the specific surface area of sulfur loading active carbon with Mercury vapour adsorbance, it can be seen that adopt black liquor of pulp making, either a certain black liquor or their mixture, by 800 Charing at a temperature of DEG C -850 DEG C, can prepare the demercuration adsorbent product for exceeding sulfur loading active carbon with mercury vapour adsorbance. And its preparation process is simple, production cost can be reduced, with potentiality are significantly commercially produced, be applied to actual Flue gas demercuration occasion.

Claims (9)

1. a kind of production method of flue gas demercuration Special adsorbent, it is characterised in that comprise the steps：
（1）The solid content that black liquor of pulp making dehydration is obtained, in an inert atmosphere, with the ramp of 1 ~ 5 DEG C/min to 250 DEG C, Insulation 1-2h, then with the ramp of 5 ~ 10 DEG C/min to 600-850 DEG C, carbonizes 1-3h, takes after cooling down under an inert atmosphere Go out；
（2）The products in water obtained after cooling is washed 1-2 time, is dried, crushed prepared flue gas demercuration adsorbent.
2. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（1）In, institute The black liquor of pulp making stated is the one kind or several in the black liquor that softwood, broadleaf, bamboo wood or grass raw material Jing chemical pulpings are obtained Plant mixing.
3. the production method of flue gas demercuration Special adsorbent according to claim 2, it is characterised in that described chemistry system Starch as alkaline process or sulphite slurrying.
4. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（1）In, institute The inert atmosphere stated is nitrogen or argon inert atmosphere.
5. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（1）In, institute The charing stated is carried out in nitrogen or argon inert atmosphere, and carbonization temperature is between 700-850 DEG C.
6. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（1）In, institute The intensification stated is, 250 DEG C before using the heating rates of 1 ~ 2 DEG C/min, and 250 DEG C then using the heating rate of 5-8 DEG C/min.
7. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（2）In, institute The number of times of the products in water washing stated is 2 times.
8. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（2）In, institute The flue gas demercuration adsorbent stated is powdered activated carbon.
9. the production method of flue gas demercuration Special adsorbent according to claim 1, it is characterised in that step（1）In, In inert atmosphere, with the ramp of 1-2 DEG C/min to 250 DEG C, 2h is incubated, then with the ramp of 5 DEG C/min to 750- 850 DEG C, 1-2h is carbonized, taken out after cooling down under an inert atmosphere.
CN201710002742.1A 2017-01-03 2017-01-03 Production method of adsorbent for removing mercury from flue gas Pending CN106622137A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110639470A (en) * 2019-08-20 2020-01-03 中船重工（邯郸）派瑞特种气体有限公司 Adsorbent for removing difluorodinitrogen and tetrafluorodinitrogen in nitrogen trifluoride
CN110420624A (en) * 2019-08-22 2019-11-08 农业农村部环境保护科研监测所 A kind of multiporous biological matter charcoal based phosphates adsorbent and its preparation method and application
CN110420624B (en) * 2019-08-22 2022-02-22 农业农村部环境保护科研监测所 Porous biomass charcoal-based phosphate adsorbent and preparation method and application thereof
CN115445588A (en) * 2022-08-15 2022-12-09 东南大学 Biomass-based porous carbon composite material, preparation method thereof and application thereof in CO 2 Application in adsorption
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Application publication date: 20170510