CN104437445A - Gas desorption method of hexavalent chromium adsorbed on anionic layered compound - Google Patents
Gas desorption method of hexavalent chromium adsorbed on anionic layered compound Download PDFInfo
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- CN104437445A CN104437445A CN201310415327.0A CN201310415327A CN104437445A CN 104437445 A CN104437445 A CN 104437445A CN 201310415327 A CN201310415327 A CN 201310415327A CN 104437445 A CN104437445 A CN 104437445A
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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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
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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
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- 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
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3433—Regenerating or reactivating of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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Abstract
The invention relates to a method for desorption of hexavalent chromium adsorbed on an anionic layered compound by a gas desorption agent. The invention uses the gas desorption agent (such as CO2 gas) for high concentration desorption of the hexavalent chromium adsorbed on f the anionic layered compound under certain pressure, and can realize recycling of hexavalent chromium resource and low-cost and easy regeneration and recycling of the anionic layered compound adsorbent material. The method has the advantages of wide source and low cost gas desorption agent (such as CO2 gas), high concentration desorption and easy recycling and regeneration of the adsorption material, little water consumption in the desorption process, concentration of the desorbed hexavalent chromium liquid reaching higher than 5000 mg / L, chromium desorption rate reaching more than 90%, and no introduction of other impurity ions in the desorption solution in the desorption process. In addition, the method provided by the invention can realize regeneration of adsorption material after desorption and does not need complex process, such as high temperature calcining and hydration.
Description
Technical field
The present invention relates to a kind of chromic desorption method, be specifically related to the chromic desorption method that anion lamellar compound adsorbs.
Background technology
Along with Global Sustainable Development implementation, recycling industries and clean production technology is more and more subject to people and pays close attention to.Industry is administered from end treatment to process for cleanly preparing containing hexavalent chromium wastewater, material recycle utilizes, waste water recycling future development, cleaner production is made to become productivity, alleviate the resource supply and demand contradiction and problem of environmental pollution of increasingly sharpening, become the active demand of enterprise development and transition and upgrade.Based on this development trend, some and the traditional chemical such as ion-exchange and membrane separation process reduce-and the new technology of the diverse industrial chromium-containing waste water process of the precipitation method and reuse researched and developed out in succession.But being carrier with resin and cellulose, ion-exchange cost is higher, and the desorption of chromium and material regeneration need alternately to rinse with strong acid and strong base, thus in system, introduce other ions, are unfavorable for the recycling of chromium.In addition, ion exchange resins/fibers element and membrane separation process used carrier material are all organic matters, process acidic high-strength containing easily oxidized and make material failure during hexavalent chromium wastewater, and cannot accomplish the high power of chromium concentrated.
Layered double hydroxide (LDHs) is widely studied as new and effective anion absorption agent in water pollution is administered.Research shows, Mg-Al layered doubled hydroxide (Mg/Al-LDHs) has good adsorption effect (Y.J.Li, Water Res., 2009,43,3067-3075 to Cr VI; Chen Tianhu, environmental science, 2004,25,89-93; X.Y.Yuan, Chem.Eng.J., 2013,221,204-213; ); In addition, some researchers have reported that, Zn/Al-LDHs, Ca/Al-LDHs, the lamellar compounds such as Zn/Cr-LDHs, Li/Al-LDHs, Ni/Al-LDHs, Ca/Mg/Al-LDHs have good adsorption effect (Y.C.Dai to Cr VI too, J.Hazard.Mater., 2009,170,1086 – 1092; B.Houri, J.Chim.Phys.PCB, 1999,96,455 – 463; D.Carriazo, Appl.Clay Sci., 2007,37,231 – 239; L.C.Hsu, J.Hazard.Mater., 2007,142,242 – 249; Y.Chen, Ind.Eng.Chem.Res., 2013,52,4436-4442; R.L.Goswamee, Appl.Clay Sci.1998,13,21 – 34; N.Murayama, Kagaku Kogaku Ronbun., 2012,38,234-241).Compare with membrane separation process used carrier material with ion exchange resins/fibers element, this inorganic layered compounds material is large to chromium adsorption capacity, is not afraid of oxidized, and can realize concentrating the desorption of chromium.But usual carbonate or bicarbonate solution etc. carry out desorption (Y.F.Xu, Ind.Eng.Chem.Res., 2010,49,2752-2758 after current LDHs adsorbing hexavalent chromium; Chen Tianhu, environmental science, 2004,25,89-93), this method introduces a large amount of heteroions in desorption liquid, and desorption chromium solution concentration is out low, cannot realize the recycling of chrome liquor; And the material after desorption is through high-temperature roasting, and aquation realizes regeneration, and complex technical process, cost is high.The people such as Li report the method utilizing villaumite to carry out desorption, but this method also exist introduce a large amount of heteroion, desorption liquid chromium concn low, cannot the problems such as waste liqouor be realized, and there is great reduction (Y.J.Li to chromic adsorption capacity in the regrown material after desorption, Water Res., 2009,43,3067-3075).Some researchers have reported that in 90 degree of hydrothermal desorption Li/Al-LDHs, adsorbing hexavalent chromium realizes the method for material regeneration, although this desorption method can not introduce heteroion in system, but need to consume a large amount of heat energy, and need a large amount of water of consumption could realize chromic effective desorption, desorption chromium solution concentration is out low, cannot recycling, in fact become again a kind of containing hexavalent chromium wastewater (L.C.Hsu, J.Hazard.Mater., 2007,142,242 – 249).Therefore, up to the present also do not have a kind of suitable method can realize the high concentration desorption of adsorbing hexavalent chromium in lamellar compound and the low-cost high-efficiency regeneration of sorbing material, significantly limit the application of LDHs material in the process of actual industrial chromate waste water.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, provide a kind of anion type laminated compound for adsorbing hexavalent chromium by the method for Cr VI high concentration desorption, achieve the easy regeneration cycle of sorbing material and high concentration chromium recycling.
For realizing goal of the invention, the present invention adopts following technical scheme: a kind of chromic method that desorption anion lamellar compound adsorbs, and it is characterized in that: adopt gas phase desorbing agent to carry out desorption.
The present invention adopts a kind of gas phase desorbing agent to realize desorption chromic in anion type laminated compound, solve with carbonate, bicarbonate and villaumite are the problem that the desorption method of desorbing agent can introduce other heteroions a large amount of in desorption process, and need after desorption through high-temperature calcination, the technical process that aquation etc. are complicated could realize the problem of material regeneration.The method of the gas phase desorption that the present invention adopts introduces other heteroions hardly in desorption process in system, be conducive to the recycling containing chromium desorption liquid, and sorbing material can Direct Regeneration after desorption, and do not need calcining, realize easy, low cost and the highly efficient regeneration of sorbing material.
According to the present invention, described gas phase desorbing agent is pure CO
2gas, or CO
2with the mist of other non-solubility gases, or containing CO
2industrial tail gas.Preferably, CO
2volume percent content in described gas phase desorbing agent is more than or equal to 30%, is up to 100%.This is conducive to improving chromic desorption efficiency, reduces desorption time.More preferably, described volume percent content is more than or equal to 40%; Also more preferably, described volume percent content is more than or equal to 50%, and preferably, described volume percent content is more than or equal to 60%.
The present invention selects CO
2gas is because of CO under certain air pressure conditions as desorbing agent
2can the Cr VI that adsorbs of desorption anion type laminated compound effectively, and remove CO
2rear anion type laminated compound can recover rapidly chromic adsorption capacity again, realizes the regeneration of material.Meanwhile, CO
2source is wide, and desorption cost is low, and has no side effect, and cost is low, free from environmental pollution.
According to the present invention, described anion lamellar compound refers to layered double-hydroxide, is the compound formed by positively charged main body laminate and interlayer anion object ordered fabrication.
According to the present invention, described anion lamellar compound is selected from Mg-Al layered doubled hydroxide (Mg/Al-LDHs) or chemical formula is [M
2+ 1-xm
3+ x(OH)
2]
x+(A
n-)
x/nzH
2the compound of O, wherein M
2+be selected from the one in Zn, Mg, Ca, Cu, Co, Ni, Fe, Mn, V, Cd, Sr or Ba or any two kinds; M
3+be selected from the one in Fe, Al, Mn, Ti, Co, Ga, Cr, V, Mo, Sc, Ru or Be; A
n-for interlayer anion, be selected from Cl
-, OH
-, NO
3 -, CO
3 2-, SO
4 2-, F
-, I
-, Br
-, HPO
4 2-, H
2pO
4 -or ClO
3 -in one or any several combinations.
One of preferred embodiment of the present invention, during desorption, gas pressure is 0.1-5MPa.When gas is (as CO
2) pressure is when being less than 0.1MPa, the Cr VI adsorbed in anion lamellar compound can not desorption, or desorption is not obvious; When gas is (as CO
2) pressure is when being greater than 5MPa, Cr VI desorption efficiency does not increase, but increases the requirement of withstand voltage of desorption apparatus, and the manufacturing cost of desorption apparatus increases.
Another preferred embodiment of the present invention, before desorption, adds water in the anion lamellar compound of described adsorbing hexavalent chromium, and make liquid-solid ratio be 1-8, preferred liquid-solid ratio is 2-4.When liquid-solid ratio is less than 2, Cr VI desorption rate declines; When liquid-solid ratio is for being greater than 4, Cr VI desorption rate increases, but in desorption liquid, hexavalent chromium concentration reduces, and is unfavorable for chromic recycling.
The Method And Principle of Cr VI desorption provided by the invention is as follows:
The Cr VI be adsorbed on anion lamellar compound under certain pressure conditions, cements out with specific gas phase desorbing agent by method of the present invention, occurs to act on as follows:
(CrO
4)
x/2x/2CrO
4 2-
[M
2＋ 1-xM
3＋ x(OH)
2](HCrO
4)
x+x B+x H
2O→[M
2＋ 1-xM
3＋ x(OH)
2](BOH)
x+x HCrO
4 -+x H
+(1)
(Cr
2O
7)
x/
2x/2Cr
2O
7 2-
Wherein B is gas phase desorbing agent as above.
Beneficial effect of the present invention:
The present invention utilizes gas phase desorbing agent (as CO
2gas) under a certain pressure to the Cr VI high concentration desorption that anion lamellar compound adsorbs, the recycling of hexavalent chromium resources and the low cost of anion stratiform compounds adsorb material and easy regeneration can be realized and recycle.This method gas phase desorbing agent used is (as CO
2gas) to originate extensively, cost is low.The desorption process water consumption of the inventive method is few, and desorption sexavalence chrome liquor concentration can reach more than 5000mg/L, and the desorption rate of chromium can reach more than 90%, and in system, does not introduce other heteroions in desorption process.In addition, directly realize the regeneration of sorbing material after method desorption of the present invention and do not need by the complicated technology such as high-temperature calcination, aquation.The inventive method achieves the easy regeneration of chromic low cost in anion lamellar compound, high concentration desorption and sorbing material and recycle, there is higher Social and economic benef@.
Specific implementation method
Embodiment 1:
(1) chromic for 10g saturated adsorption Mg-Al layered doubled hydroxide is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2MPa, desorption 2h.By the slurries suction filtration after desorption, it is 18.5g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magaldrate after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 93%.
Embodiment 2:
(1) chromic for 300g saturated adsorption Mg-Al layered doubled hydroxide is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.5MPa, desorption 1.5h.By the slurries suction filtration after desorption, it is 16.8g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magaldrate after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 95%.
Embodiment 3:
(1) chromic for 20g saturated adsorption stratiform magnesium hydroxide iron aluminium is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.3MPa, desorption 2h.By the slurries suction filtration after desorption, it is 16.2g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 92%.
Embodiment 4:
(1) chromic for 500g saturated adsorption stratiform calcium magnesium hydroxide aluminium is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.7MPa, desorption 2h.By the slurries suction filtration after desorption, it is 11.9g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 96%.
Embodiment 5:
(1) chromic for 500g saturated adsorption stratiform lithium hydroxide aluminium is placed in closed container, adds water, make liquid-solid ratio be 4, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.7MPa, desorption 2h.By the slurries suction filtration after desorption, it is 16.1g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 96%.
Embodiment 6:
(1) chromic for 200g saturated adsorption stratiform hydroxide zinc-aluminium is placed in closed container, adds water, make liquid-solid ratio be 2, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.7MPa, desorption 2h.By the slurries suction filtration after desorption, it is 15.3g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 96%.
Embodiment 7:
(1) chromic for 20g saturated adsorption stratiform nickel hydroxide aluminium is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 2.5MPa, desorption 2h.By the slurries suction filtration after desorption, it is 14.3g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 94%.
Embodiment 8:
(1) chromic for 450g saturated adsorption stratiform hydroxide zinc chrome is placed in closed container, adds water, make liquid-solid ratio be 4, and stir.
(2) pure CO is passed into while stirring
2gas, regulates CO
2gas atmosphere to 3MPa, desorption 2h.By the slurries suction filtration after desorption, it is 15.2g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magnesium hydroxide iron aluminium after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 95%.
Embodiment 9:
(1) chromic for 15g saturated adsorption Mg-Al layered doubled hydroxide is placed in closed container, adds water, make liquid-solid ratio be 3.5, and stir.
(2) CO is passed into while stirring
2and N
2mist (wherein, CO
2percent by volume be 50%), adjustments of gas air pressure to 2.5MPa, desorption 2h.By the slurries suction filtration after desorption, it is 15.3g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magaldrate after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 94%.
Embodiment 10:
(1) chromic for 350g saturated adsorption Mg-Al layered doubled hydroxide is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) limestone calcination kiln gas through removal of impurities and purification is passed into while stirring (containing CO
2percent by volume is 60%), adjustable pressure to 3MPa, desorption 2.5h.By the slurries suction filtration after desorption, it is 15.8g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magaldrate after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 94%.
Embodiment 11:
(1) chromic for 500g saturated adsorption Mg-Al layered doubled hydroxide is placed in closed container, adds water, make liquid-solid ratio be 3, and stir.
(2) cement kiln tail gas through removal of impurities and purification is passed into while stirring (containing CO
2percent by volume is 40%), adjustable pressure to 3.5MPa, desorption 3h.By the slurries suction filtration after desorption, it is 12.5g/L that filtrate diphenyl carbazide spectrophotometry (GB7467-87) detects hexavalent chromium concentration in the aqueous solution.
(3) filter residue is by (1), and (2) step repeats desorption 2 times.Repetition desorption is can be used for two, three times, until hexavalent chromium concentration reclaims after reaching more than 10g/L containing low dense chromic desorption liquid.Magaldrate after desorption can be directly used in the process of industrial chromium-containing waste water.To analyze before desorption with plasma spectroscopy and the changes of contents of chromium in magnesium hydroxide aluminium compound after desorption, the desorption rate of known chromium is 92%.
Below preferred embodiment of the present invention is illustrated, but the present invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modification or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (7)
1. a desorption anion lamellar compound chromic method of adsorbing, is characterized in that: adopt gas phase desorbing agent to carry out desorption.
2. method according to claim 1, described gas phase desorbing agent is pure CO
2gas, or CO
2with the mist of other non-solubility gases, or containing CO
2industrial tail gas.
3. method according to claim 2, preferred CO
2volume percent content in described gas phase desorbing agent is more than or equal to 30%, is up to 100%; More preferably, described volume percent content is more than or equal to 40%; Also more preferably, described volume percent content is more than or equal to 50%.
4. the method according to any one of claims 1 to 3, described anion lamellar compound is selected from layered double-hydroxide, is the compound formed by positively charged main body laminate and interlayer anion object ordered fabrication.
5. the method according to any one of Claims 1-4, described anion lamellar compound is selected from Mg-Al layered doubled hydroxide (Mg/Al-LDHs) or chemical formula is [M
2+ 1-xm
3+ x(OH)
2]
x+(A
n-)
x/nzH
2the compound of O, wherein M
2+be selected from the one in Zn, Mg, Ca, Cu, Co, Ni, Fe, Mn, V, Cd, Sr or Ba or any two kinds; M
3+be selected from the one in Fe, Al, Mn, Ti, Co, Ga, Cr, V, Mo, Sc, Ru or Be; A
n-for interlayer anion, be selected from Cl
-, OH
-, NO
3 -, CO
3 2-, SO
4 2-, F
-, I
-, Br
-, HPO
4 2-, H
2pO
4 -or ClO
3 -in one or any several combinations.
6. the method according to any one of claim 1 to 5, during desorption, gas pressure is 0.1-5MPa.
7. the method according to any one of claim 1 to 6, before desorption, adds water in the anion lamellar compound of described adsorbing hexavalent chromium, and make liquid-solid ratio be 1-8, preferred liquid-solid ratio is 2-4.
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Cited By (4)
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| CN107557014A (en) * | 2017-08-30 | 2018-01-09 | 天津大学 | A kind of acid magaldrate and preparation method thereof and the application in the reclamation of salinep-alkali soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105058913A (en) * | 2015-08-28 | 2015-11-18 | 华南理工大学 | Nano-crystalline cellulose/layered double hydroxide composite membrane and preparation method |
| CN107470326A (en) * | 2017-08-28 | 2017-12-15 | 华南理工大学 | The method of supercritical extract and carbon dioxide detoxification processing heavy metal waste slag containing organic matter |
| CN107557014A (en) * | 2017-08-30 | 2018-01-09 | 天津大学 | A kind of acid magaldrate and preparation method thereof and the application in the reclamation of salinep-alkali soil |
| CN109692649A (en) * | 2017-10-20 | 2019-04-30 | 中国石油化工股份有限公司 | Remove the adsorbent and preparation method thereof of chromate ion in water |
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