CN106824979A - A kind of cooperative disposal method of Cr VI slag and biomass castoff - Google Patents
A kind of cooperative disposal method of Cr VI slag and biomass castoff Download PDFInfo
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- CN106824979A CN106824979A CN201710004459.2A CN201710004459A CN106824979A CN 106824979 A CN106824979 A CN 106824979A CN 201710004459 A CN201710004459 A CN 201710004459A CN 106824979 A CN106824979 A CN 106824979A
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- slag
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- pyrolysis
- biomass castoff
- gas
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- 239000002893 slag Substances 0.000 title claims abstract description 70
- 239000002028 Biomass Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000011651 chromium Substances 0.000 claims abstract description 83
- 239000007789 gas Substances 0.000 claims abstract description 40
- 238000000197 pyrolysis Methods 0.000 claims abstract description 35
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 31
- 238000005336 cracking Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 10
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000002829 reductive effect Effects 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 5
- 239000001257 hydrogen Substances 0.000 claims abstract description 5
- 238000007158 vacuum pyrolysis Methods 0.000 claims abstract description 5
- 239000000295 fuel oil Substances 0.000 claims abstract description 3
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 2
- 244000105624 Arachis hypogaea Species 0.000 claims description 2
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 2
- 235000018262 Arachis monticola Nutrition 0.000 claims description 2
- 240000007049 Juglans regia Species 0.000 claims description 2
- 235000009496 Juglans regia Nutrition 0.000 claims description 2
- 235000020232 peanut Nutrition 0.000 claims description 2
- 235000020234 walnut Nutrition 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 6
- 239000010902 straw Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- -1 plating Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- RMXTYBQNQCQHEU-UHFFFAOYSA-N ac1lawpn Chemical group [Cr]#[Cr] RMXTYBQNQCQHEU-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000002153 concerted effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/10—Destroying solid waste or transforming solid waste into something useful or harmless involving an adsorption step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/004—Covering of dumping sites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a kind of Cr VI slag and the cooperative disposal method of biomass castoff, biomass castoff and Cr VI slag are dried first, break process, then biomass castoff is placed in vacuum cracking furnace bottom, Cr VI slag is covered in above biomass castoff, carries out vacuum pyrolysis reduction；Biomass castoff is through pyrolysis generation biomass carbon and pyrolysis gas；The pyrolysis gas of generation are under suction function, vertically upward past Cr VI slag, Cr VI slag is reduced to trivalent chromium slag by the reducing gas such as carbon monoxide, hydrogen in pyrolysis gas, and pyrolysis gas obtain liquid fuel oil by being extracted out into condenser cooling from vacuum cracking stove top gas outlet after Cr VI slag；Mixed processing is carried out to pyrolysis residue addition copperas solution, then send security landfill innoxious landfill.Present invention process raw material is easy to get, and equipment safety strong operability, cost is relatively low, non-secondary pollution, and biomass have obtained high efficiente callback utilization, is capable of achieving large-scale popularization and application.
Description
Technical field：
The invention belongs to resource regeneration field, and in particular to the cooperative disposal side of a kind of Cr VI slag and biomass castoff
Method.
Technical background：
Chromic salts is one of important inorganic chemical product, and its series of products is the class industrial chemicals that China gives priority to,
It is widely used in various portions such as senior alloy material, plating, leather, pigment, spices, printing and dyeing, ceramics, anti-corrosion, catalysis, medicine
Door, is related to the 10% of national economy range of goods.One of most competitive 8 kinds of resource raw materials are listed in the world,
China is more than 20 ten thousand tons per annual requirement.But meanwhile, its chromium slag for producing is again current heavy industries topmost in the world
One of pollution sources, hexavalent chromium compound therein has very strong oxidisability, can enter human body by alimentary canal and skin, point
Cloth lodges in lung in liver and kidney, or through respiratory tract, can cause water soluble hexavalent chromium in various diseases, and chromium slag, through rain
Water shower, in depth under, polluted underground water.According to investigations, current China be directly produced bichromate enterprise it is big and small up to
Family more than 30, more than 300,000 tons, total output ranks first in the world annual production capacity.1 ton of chromic salts product is often produced, while producing 2.5-
3 tons of chromium slags, the annual about 750,000 tons of newborn poisonous waste residues containing chromium of actual generation in the whole nation, store up over the years in addition, add up chromium slag not
Less than 2,000,000 tons.Arbitrarily discharge, store up chromium slag, not only take a large amount of soils, and chromium slag through rainwater drip washing, high concentration chrome wastewater four
Place overflow, under ooze, soil, underground water, river course are polluted.The harm that chromium slag is caused to environment has increasingly caused people's
Note extensively, pay attention to chromium slag contaminated, carry out its pollution control and comprehensive utilization is imperative, it is significant.Therefore, country is chromium
Chromium slag has formulated water-soluble content of 6-valence Cr ions standard in discharge capacity and slag in salt industrial.
The method for the treatment of chromium slag is mainly using wet method detoxifcation by the way of at present, using adding reducing agent by sexavalence in chromium slag
The method that chromium detoxifies in liquid-phase reduction, but the method uses big reagent consumption, high cost, meeting with a series of processing procedure, deposits
In the hidden danger of secondary pollution.
China's agricultural crop straw is main based on corn stalk (27%), wheat straw (18%) and rice straw (30%), wherein making fertilizer
Also field and its collection loss accounts for the 15% of total amount, and remaining is mostly as peasant household's heating fuel (about 37%), but it is changed
Less efficient, only 15%-20% is largely the waste of the energy.The maximum pollution of Wastes of Crops is field burning,
With the development of rural economy, the increase of farmers' income, the ratio of commercial energy is continuously increased in rural area, coal, liquefied petroleum gas
Energy is mainly used Deng it has been turned into.Stalk is big due to volume, and efficiency is low, and first as the object for being substituted, the whole nation there are about every year
20.5% stalk is abandoned in field, is directly burnt in Tanaka, produces substantial amounts of CO, CO2, SO2, the pollutant such as NOx and flue dust,
Severe contamination atmospheric environment, dense smoke diffuses the safety for also affecting traffic and air transportation cause, or even a lot of burning occurred
Burning stalk causes the event that highway is closed, civil aviaton grounds, and very big influence is brought to people's Health and Living.
How the two is carried out into innoxious efficient disposal, be the important topic that we face.Applicant is from cooperative disposal
Angle is set out, with reference to the physicochemical characteristics of the two, it is proposed that a kind of method of cooperative disposal, it is intended to harmless treatment chromium slag,
Resource biomass castoff.
The content of the invention：
The technical problems to be solved by the invention are to provide the cooperative disposal side of a kind of Cr VI slag and biomass castoff
Method.
In order to solve the above-mentioned technical problem, the present invention is provided a kind of Cr VI slag and the cooperative disposal of biomass castoff
Method, is realized using following step：
(1) biomass castoff, is taken, is dried and break process, obtain the powdered biomass of 2-5mm；Take Cr VI
Slag is dried and is processed with coarse crushing, obtains the Cr VI solid impurity particle thing of 5-10mm；
(2) powdered biomass, is placed in vacuum cracking furnace bottom, Cr VI solid impurity particle thing is then covered in biomass powder
On end；By the closing of vacuum cracking stove, it is connected with condenser, vavuum pump successively by the gas outlet on vacuum cracking stove top；
(3), vacuum cracking stove is heated, with the heating rate of 60 DEG C/min to 800 DEG C, heating is then kept
Temperature 30min, biomass castoff is through pyrolysis generation biomass carbon and pyrolysis gas；The pyrolysis gas of generation hang down under suction function
Cr VI slag directly is passed upward through, Cr VI slag is reduced to trivalent chromium slag by the reducing gas such as carbon monoxide, hydrogen in pyrolysis gas,
Pyrolysis gas obtain liquid fuel oil by being extracted out into condenser cooling from vacuum cracking stove top gas outlet after Cr VI slag, remain
Residual air body enters air through vavuum pump；
(4), after cooling vacuum pyrolysis furnace to room temperature, the pyrolysis residue in stove is taken out, adds the sulfuric acid that mass fraction is 1%
Ferrous iron solution carries out mixed processing, then send security landfill innoxious landfill.
Described biomass castoff is 3 with volume ratio of the Cr VI slag in vacuum cracking stove:1；
Described biomass castoff takes from one or more in stalk, walnut shell, rice hulls, peanut shell, wood sawdust；
Content of 6-valence Cr ions in described Cr VI slag is not higher than 200mg/kg；
System pressure in described vacuum cracking stove is not higher than 10kpa；
Described condenser condensation temperature is -5-0 DEG C；
Described pyrolysis residue is 1L with the solid-to-liquid ratio of copperas solution:2kg.
The device of the cooperative disposal method of a kind of Cr VI slag of the present invention and biomass castoff, including vacuum cracking stove,
Condensation recovering device, vavuum pump, are provided with heater outside the vacuum cracking stove, the vacuum cracking stove top is provided with top
Lid, the vacuum cracking stove bottom is provided with bottom, and vacuum cracking furnace side top is provided with gas outlet, the vacuum cracking
Stove gas outlet is connected with condensation recovering device and vavuum pump successively by pipeline.
Using a kind of Cr VI slag and the cooperative disposal method of biomass castoff of above-mentioned technical proposal, its operation principle
It is summarized as follows：
Under vacuum conditions, Cr VI slag and biomass castoff are carried out cooperateing with pyrolysis processing, biomass to produce a large amount of
Volatile organic matter and reducibility gas, by by two kinds of material preferred arrangements in pyrolysis furnace, make Cr VI slag be in heat
Solution airflow direction, under the high temperature conditions by Cr VI slag, the reducing gas such as carbon monoxide therein, hydrogen is by six for reducing gas
Valency chromium is reduced to trivalent chromium, and wherein small molecule organic compound enters condenser generation pyrolysis oil；Biomass castoff is by vacuum
After pyrolysis, the chromium slag after solid biomass carbon, with reduction is formed in stove and is mixed；During vacuum pyrolysis, due to
Chromium slag is metal oxide, and the pyrolytic process to biomass serves catalytic action, especially for the vacuum flash of biomass
Pyrolytic process gas production has facilitation, is easy to the yield of pyrolysis gas to improve, and promotes to be pyrolyzed biomass process to a certain extent
Produce more reducibility gas.By after pyrolytic process, hexavalent chrome reduction is trivalent chromium, in order to more consolidate the steady of trivalent chromium
It is qualitative, mixed processing is carried out to ferrous sulfate is put into solid product, the chromium slag after treatment is more reliable and more stable, send security landfill
Final disposal.
For traditional sexavalence chromic wastes disposal method, the present invention has following advantage：
1st, making full use of the high temperature reductive gas produced by biomass pyrolytic carries out reduction treatment to Cr VI slag, realizes
Dry process chromium residue detoxifying process, it is to avoid wet-treating causes high cost, secondary pollution；
2nd, biomass pyrolysis process adds chromium slag, has concerted catalysis to act on biomass gas production, improves pyrolysis gas condensation
Oil productivity, the fuel oilization for further increasing biomass is utilized；
3rd, Cr VI slag and biomass carry out pyrolysis processing in the same apparatus, and solid-state carbonization is formed after biomass pyrolytic
Thing, carbide is porous structure material, after mixing with chromium slag, adds ferrous sulfate to consolidate reduction, by porous carbide
Suction-operated further stabilize chromium slag, improve the stabilization effect of chromium slag.
4th, the present invention creatively unites two into one biomass pyrolysis process and chromic slag dry method reduction process, and technical thinking is skilful
Wonderful, raw material is easy to get, equipment safety strong operability, eliminates a large amount of chemical reagent and handling process mistake caused by wet-treating
Journey, cost is relatively low, non-secondary pollution, and biomass have obtained high efficiente callback utilization, is capable of achieving large-scale popularization and application.
Brief description of the drawings：
Fig. 1 is the process chart of a kind of Cr VI slag and the cooperative disposal method of biomass castoff
Fig. 2 is the schematic device of a kind of Cr VI slag and the cooperative disposal method of biomass castoff
In Fig. 2,1 is top cover, 2 is vacuum cracking stove, 3 is heater, 4 is reactor inner chamber, 5 is bottom, 6 is outlet
Mouthful, 7 be condensation recovering device, 8 be vavuum pump.
Specific embodiment：
Biomass straw is taken, is dried and break process, obtain the stalk powder of 2-5mm；Cr VI slag is taken to be done
Dry and coarse crushing treatment, obtains the Cr VI solid impurity particle thing of 5-10mm；Stalk powder is placed in vacuum cracking furnace bottom, then by six
Valency chromium solid impurity particle thing is covered on stalk powder, and stalk powder is 3 with volume ratio of the Cr VI slag in vacuum cracking stove:1；
By the closing of vacuum cracking stove, it is connected with condenser, vavuum pump successively by the gas outlet on vacuum cracking stove top；To vacuum cracking
Stove is heated, and with the heating rate of 60 DEG C/min to 800 DEG C, then keeps the heating-up temperature 30min, system pressure to be
10kpa, stalk powder is through pyrolysis generation biomass carbon and pyrolysis gas；The pyrolysis gas of generation are passed through vertically upward under suction function
Cr VI slag is crossed, Cr VI slag is reduced to trivalent chromium slag, pyrolysis gas warp by the reducing gas such as carbon monoxide, hydrogen in pyrolysis gas
Extracted out from vacuum cracking stove top gas outlet after crossing Cr VI slag, into condenser, condenser condensation temperature is -5 DEG C, is cooled down
Oily to liquid fuel, residual gas enters air through vavuum pump；Then cooling vacuum pyrolysis furnace takes out the pyrolysis in stove to room temperature
Residue, adds the copperas solution that mass fraction is 1%, and pyrolysis residue is 1L with the solid-to-liquid ratio of copperas solution:2kg,
Then mixed processing is carried out, finally send security landfill innoxious landfill.
Cr VI test is carried out to the chromium slag after before processing, data are as follows：
| Collaboration treatment result of the test | Before processing | After treatment |
| Content of 6-valence Cr ions mg/kg | 185.59 | 1.13 |
2mg/kg is less than through hexavalent chromium concentration in the chromium slag after treatment, is met《Standard of soil environment quality》(GB15618-
1995) secondary standard, economic benefit and environmental benefit are good.
Claims (7)
1. a kind of cooperative disposal method of Cr VI slag and biomass castoff, it is characterised in that：Comprise the following steps：
(1) biomass castoff, is taken, is dried and break process, obtain the powdered biomass of 2-5mm；Cr VI slag is taken to enter
Row is dried and coarse crushing treatment, obtains the Cr VI solid impurity particle thing of 5-10mm；
(2) powdered biomass, is placed in vacuum cracking furnace bottom, then by Cr VI solid impurity particle thing be covered in powdered biomass it
On；By the closing of vacuum cracking stove, it is connected with condenser, vavuum pump successively by the gas outlet on vacuum cracking stove top；
(3), vacuum cracking stove is heated, with the heating rate of 60 DEG C/min to 800 DEG C, heating-up temperature is then kept
30min, biomass castoff is through pyrolysis generation biomass carbon and pyrolysis gas；The pyrolysis gas of generation under suction function, vertically to
On by Cr VI slag, Cr VI slag is reduced to trivalent chromium slag by the reducing gas such as carbon monoxide, hydrogen in pyrolysis gas, is pyrolyzed
Gas obtains liquid fuel oil, remaining gas by being extracted out into condenser cooling from vacuum cracking stove top gas outlet after Cr VI slag
Body enters air through vavuum pump；
(4), after cooling vacuum pyrolysis furnace to room temperature, the pyrolysis residue in stove is taken out, adds the ferrous sulfate that mass fraction is 1%
Solution carries out mixed processing, then send security landfill innoxious landfill.
2. the cooperative disposal method of a kind of Cr VI slag according to claim 1 and biomass castoff, it is characterised in that：
Described biomass castoff is 3 with volume ratio of the Cr VI slag in vacuum cracking stove:1.
3. the cooperative disposal method of a kind of Cr VI slag according to claim 1 and 2 and biomass castoff, its feature exists
In：Described biomass castoff takes from one or more in stalk, walnut shell, rice hulls, peanut shell, wood sawdust.
4. the cooperative disposal method of a kind of Cr VI slag according to claim 1 and 2 and biomass castoff, its feature exists
In：Content of 6-valence Cr ions in described Cr VI slag is not higher than 200mg/kg.
5. the cooperative disposal method of a kind of Cr VI slag according to Claims 1-4 any one and biomass castoff,
It is characterized in that：System pressure in described vacuum cracking stove is not higher than 10kpa.
6. the cooperative disposal method of a kind of Cr VI slag according to claim 1 to 5 any one and biomass castoff,
It is characterized in that：Described condenser condensation temperature is -5-0 DEG C.
7. the cooperative disposal method of a kind of Cr VI slag according to claim 1 to 6 any one and biomass castoff,
It is characterized in that：Described pyrolysis residue is 1L with the solid-to-liquid ratio of copperas solution:2kg.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426542A (en) * | 2021-07-02 | 2021-09-24 | 昆明理工大学 | Detoxification and stabilization method for hexavalent chromium-containing historical remaining tailings and surrounding soil |
| CN113817484A (en) * | 2021-09-14 | 2021-12-21 | 中国矿业大学 | Method for treating sulfur-containing organic solid waste and chromite processing waste residue through hydrogenation pyrolysis |
| CN114251669A (en) * | 2021-12-16 | 2022-03-29 | 常州大学 | Tanning sludge pyrolysis incinerator with chromium oxidation inhibition function and treatment method thereof |
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| CN201454973U (en) * | 2009-03-18 | 2010-05-12 | 中国科学院南京土壤研究所 | Zinc-cadmium ultra accumulator plant harmless fixed bed pyrolysis device |
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| CN103978007A (en) * | 2013-10-28 | 2014-08-13 | 青岛理工大学 | Fluidized bed type of harmless chromium slag pyrolysis process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426542A (en) * | 2021-07-02 | 2021-09-24 | 昆明理工大学 | Detoxification and stabilization method for hexavalent chromium-containing historical remaining tailings and surrounding soil |
| CN113817484A (en) * | 2021-09-14 | 2021-12-21 | 中国矿业大学 | Method for treating sulfur-containing organic solid waste and chromite processing waste residue through hydrogenation pyrolysis |
| CN114251669A (en) * | 2021-12-16 | 2022-03-29 | 常州大学 | Tanning sludge pyrolysis incinerator with chromium oxidation inhibition function and treatment method thereof |
| CN114251669B (en) * | 2021-12-16 | 2023-11-17 | 常州大学 | Tanning sludge pyrolysis incinerator with chromium oxidation inhibiting function and treatment method thereof |
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