CN101549894A - Method of using lake sediment in microwave detoxification of chromium slags - Google Patents
Method of using lake sediment in microwave detoxification of chromium slags Download PDFInfo
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- CN101549894A CN101549894A CNA2009100944820A CN200910094482A CN101549894A CN 101549894 A CN101549894 A CN 101549894A CN A2009100944820 A CNA2009100944820 A CN A2009100944820A CN 200910094482 A CN200910094482 A CN 200910094482A CN 101549894 A CN101549894 A CN 101549894A
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- 239000011651 chromium Substances 0.000 title claims abstract description 101
- 239000002893 slag Substances 0.000 title claims abstract description 69
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000013049 sediment Substances 0.000 title claims abstract description 14
- 238000001784 detoxification Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000012153 distilled water Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000000706 filtrate Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- KSPIHGBHKVISFI-UHFFFAOYSA-N Diphenylcarbazide Chemical compound C=1C=CC=CC=1NNC(=O)NNC1=CC=CC=C1 KSPIHGBHKVISFI-UHFFFAOYSA-N 0.000 claims description 7
- 239000011490 mineral wool Substances 0.000 claims description 7
- 238000002798 spectrophotometry method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 13
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 229920000742 Cotton Polymers 0.000 abstract 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 230000002829 reductive effect Effects 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- UZUDISASKYIBFB-UHFFFAOYSA-L chromium dihydroxy(dioxo)chromium Chemical compound [Cr].[Cr](=O)(=O)(O)O UZUDISASKYIBFB-UHFFFAOYSA-L 0.000 description 2
- BFGKITSFLPAWGI-UHFFFAOYSA-N chromium(3+) Chemical compound [Cr+3] BFGKITSFLPAWGI-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- GAMGTECPMLLUTM-UHFFFAOYSA-N [Cr+3].[Cr](=O)(=O)([O-])O[Cr](=O)(=O)[O-].[Na+].[Cr](=O)(=O)([O-])O[Cr](=O)(=O)[O-] Chemical compound [Cr+3].[Cr](=O)(=O)([O-])O[Cr](=O)(=O)[O-].[Na+].[Cr](=O)(=O)([O-])O[Cr](=O)(=O)[O-] GAMGTECPMLLUTM-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000005442 atmospheric precipitation Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 208000015114 central nervous system disease Diseases 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- NMZAACROKXVIRE-UHFFFAOYSA-L chromium;hydroxy-(hydroxy(dioxo)chromio)oxy-dioxochromium Chemical compound [Cr].O[Cr](=O)(=O)O[Cr](O)(=O)=O NMZAACROKXVIRE-UHFFFAOYSA-L 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
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- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The present invention discloses a method of using lake sediment in microwave detoxification of chromium slags, loading chromium slags and sediment into a reactor (ceramic crucible) in certain percentage and mixing uniformly, then putting the crucible into microwave oven, around the crucible is covered by silicate cotton heat-insulating material for heat insulation, using armored thermocouple with shielding to measure temperature in the microwave field, when the temperature is up to 800-1100 DEG, heat insulation for 25-40 min and shut down the microwave oven, 10 min later opening the door, when the material is cooled down, immerging the material into distilled water for 24 h and filtering. The invention provided method has simple process, low productive investment, low energy consumption cost, large quantity of slag consumption; and has characteristics of fast heating speed, little heat loss, uniform heating. The slag of detoxifcation can be used as toner, mineralizer of concrete raw material burning, retarder of chamotte and admixture etc. The invention resolves problem of harmless treatment and uses of dangerous waste chromium slags containing Cr +6, while resolves problem of sediment processing, and achieves objective of changing waste into treasure.
Description
Technical field
The present invention relates to a kind of microwave heating that utilizes, make bottom mud in lake and chromium slag generation redox reaction, the method for coming detoxification chromium slag belongs to environment protection and disposal of waste gas, water and industrial residue field.
Background technology
Bottom mud in lake is the mixture of clay, silt, organic matter and various mineral normally, and wherein organic content is very high, is deposited on water bottom through effect such as long-time physics, chemistry and biology and water body transmission and forms.0 to the 15 centimeter thick bed mud in surface claims top layer bed mud (Surface sediment), surpasses 15 fens thick bed muds and is called deep layer bed mud (Deep sediment).
Bottom mud in lake is one of place, the main home to return to of all contaminations that enters the lake water system, by atmospheric precipitation, discharge of wastewater, rainwater leaching and variety of way such as wash away, a large amount of pollutents enters water body in lake, wherein a part deposits in the bed mud and enrichment gradually, and bed mud is polluted.Pollutent in the bed mud by and overlying water between physics, chemistry and biological exchange effect, all kinds of inorganic and organic pollutant that accumulates in the bed mud can discharge under certain condition again, pollutes overlying water.
The chromium residue that produces in the chromium salt production contains leachable Cr
6+, Cr
6+Be a kind of strong oxidizer, its toxicity and potential hazard mainly show as the sudden change of carcinogenic and modificator gene, and skin had stimulate and sensitization, and be toxic to human liver, kidney, can bring out baby's central nervous system disease etc.The pollution control and the improvement of chromium slag, and the problem of complex utilization of chromium resource are at home and abroad all very paid attention to.China National Development and Reform Committee and Environmental Protection Administration have proposed the new ruleization of chromium slag contaminated improvement, require realization chromic salts in 2010 cleaner production, substantially finished the improvement and the ecological recovery in chromium slag contaminated stockyard in 2012, this is a stern challenge to the chemical enterprise of producing chromic salts, but advance recycling economy for enterprise, realize that cleaner production also is an opportunity.Up to now, in the production of chromic salts, the generation of chromium slag also can't be avoided, and the effect of minimizing has only been accomplished in the improvement of some technologies, adds the waste residue of storing up accumulation over the years, and the processing of chromium residue remains the importance that prevents and eliminate pollution of chromium.From advancing recycling economy development, make full use of valuable chromium resource, realize cleaner production and angle of sustainable development, in the production of chromium and chromic salts, using, it is to be solved all to also have many problems to have.From the angle of resource utilization, the processing of chromium slag at present most comparatively feasible schemes, is reduced to tervalent detoxifcation by sexavalence and curing (brickmaking, production cast stone and cement) is main with chromium.
At publication number is to disclose a kind of method with carbon monoxide to detoxicate chromium residue among the CN101234238A to belong to the hexavalent chromium Cr that will produce in the sodium dichromate chromium slag
6+Be reduced into trivalent chromic ion Cr
3+Technical field.In order in high temperature, to produce more CO the hexavalent chromium Cr in the chromium slag with chromium slag and coal mixtures
6+Be reduced into trivalent chromic ion Cr
3+, it is 1.5 * 10 that chromium slag and coal are squeezed into density
3～5.5 * 10
3Kg/m
3, thickness is that the chromium dross coal briquet of 5～50mm carries out calcination, shrend is carried out with ethanolic soln in the intact back of calcination.
At publication number is to disclose a kind of harmless treatment process for waste chromium slag among the CN1799716A, technical process is: will give up chromium slag and flyash, zinc kiln slag, red mud are by useless chromium slag 40～45%, flyash 10～15%, zinc kiln slag 10～15%, being crushed to 50～80 orders behind red mud 28～30% uniform mixing sends in the sintering oven through 1000～1100 ℃ of high temperature reduction agglomerating materializations processing again, compound behind sintering water after cooling off 2～3 hours soaks and with filter cloth slag charge was leached in 20～26 hours again, and filtrate is used FeSO
4As reductive agent, add-on is Cr in the useless chromium slag
6+14～16 times of content, making filtrate is reduction reaction under 8～8.5 the condition in the pH value; The waste gas that produces in sintering is sent to the washing tower washing, and the water vapor of generation is drained.The present invention has overcome the defective that harmless treatment is not carried out in existing useless chromium slag for comprehensive utilization, with in the harmful element in the useless chromium slag and reduction, has effectively avoided useless chromium slag harmful element pollution on the environment in comprehensive utilization.
At publication number is to disclose a kind of method for treatment of chromium slag for comprehensive toxicity removal among the CN1066296A, is that the chromium slag is added water wet-milling pulping, with the dilute hydrochloric acid reaction, and successively makes filtrate and baric additive, sulfuric acid or sal epsom.Milk of lime or yellow soda ash react, and realize the comprehensive extraction and application of multiple element.Used hydrochloric acid can be realized recycling, and filter residue can be used for ironmaking, brickmaking.This law can make the lattice slag thoroughly permanently remove poison and realize full slag comprehensive utilization of resources.This law adopts common processing equipment for chemical production, easy handling, and less investment, treatment cost is low, has good benefits in environment and economic benefit.
At publication number is to disclose a kind of method of utilizing high temperature reduction and detoxication of industrial chromic slag among the CN101138670A.With the reductibility metallurgical slag heat fused that is contained in the slag ladle, after homo(io)thermism, in slag ladle, add the chromium slag, in the chromium slag mainly with water-soluble Na
2CrO
4With solubility in acid CaCrO
4The Cr (VI) that form exists is toxic, and Cr under this hot conditions (VI) is reduced into avirulent Cr (III), naturally cools to room temperature, and in the finishing slag that obtains, the clearance of Cr (VI) is up to more than 99%.This method technical process is reasonable, and equipment is simple, and is easy to operate, makes full use of the heat of material self, and the thermo-efficiency height helps chromium slag high temperature reduction, and detoxifcation is thorough, and non-environmental-pollution, and is with low cost, is suitable for the technical scale detoxification chromium slag.
There is following shortcoming in above-mentioned method: (1) complex treatment process, and operation easier strengthens, and causes production cost to increase; (2) temperature required height in the technology, long reaction time has improved production cost greatly.(3) also there is the governing problem of secondary wastewater in the part invention.
Summary of the invention
The objective of the invention is to utilize the method for microwave heating, make bottom mud in lake and chromium slag generation redox reaction, under hot conditions with Cr in the chromium slag
6+Compound is reduced to Cr in medium
3+Compound, the Cr that toxicity is bigger
6+Be reduced to the Cr of low toxicity
3+Thereby, reach the purpose of chromic slag harmlessness, its Cr
6+Detoxifying effect can reach more than 99%, and the detoxifcation slag can be supplied with manufacture of cement and make mineralizer, and glass, ceramic industry are made toner, and road engineering is done to gather materials.
A kind of method of lake sediment in microwave detoxification of chromium slags of utilizing of the present invention realizes by following embodiment: pack into by a certain percentage in reactor chromium slag and bed mud, and mix, then reactor is put into microwave oven, measures the temperature in the microwave field, treat that temperature is raised to 800～1100 ℃ after, close microwave oven behind insulation 25～40min, open fire door behind the 10min, treat material cooling after, material is immersed in the distilled water, soak the 24h after-filtration, and with the filtrate constant volume.
Described reactor is a ceramic crucible.
Temperature in the described measurement microwave field can adopt the armour formula thermocouple measurement of band shielding.
Be incubated with the slag wool lagging material around the described reactor.
Described filtrate constant volume is that filtrate is settled to 250ml, with the Cr in the diphenyl carbazide spectrophotometry mensuration filtrate
6+Concentration, and conversion accounts for the percentage ratio of sample chromium slag amount for the sexavalent chrome quality that leaches, thus calculate the detoxifcation rate.
Pack into by a certain percentage in the reactor (ceramic crucible) chromium slag and bed mud, and mix, then crucible is put into microwave oven, be incubated with the slag wool lagging material around the crucible, adopt the temperature in the armour formula thermocouple measurement microwave field of being with shielding, after treating that temperature is raised to 800～1100, insulation 25～40min closes microwave oven, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and filtrate is settled to 250ml, measure Cr in the filtrate with diphenyl carbazide spectrophotometry
6+Concentration, and conversion accounts for the percentage ratio of sample chromium slag amount for the sexavalent chrome quality that leaches, thus calculate the detoxifcation rate.
Major advantage of the present invention has:
(1) technical process is simple, and production unit is few, less investment, and energy consumption is low, and cost is low, and it is big to eat the quantity of slag;
(2) under microwave exposure, it is fast to have rate of heating, and thermosteresis is little, the characteristics of homogeneous heating.Microwave exposure also has the characteristic that activates polar molecule, change material proterties, acceleration chemical reaction, improves chemical yield in addition;
(3) the detoxifcation slag can be made toning agent, the mineralizer that cement slurry burns till, and the retardant of grog and Additive etc. can also and can be used as gathering materials of road engineering as the neutralizing agent of acid material;
(4) whole technological process solves the unwanted component in the chromium slag to greatest extent, has solved Hazardous wastes " contain the innoxious and problem of outlet of Cr6+ chromium slag, solve the problem of handling bed mud simultaneously, reach the purpose that turns waste into wealth.
Description of drawings
Fig. 1 is the lake sediment in microwave detoxification of chromium slags schema.
Embodiment
Further illustrate content of the present invention below in conjunction with embodiment, but protection scope of the present invention is not limited in these examples.
The present invention finishes according to the following steps:
1, main raw material(s):
The used chromium slag of the present invention is the industrial leached mud of chromium, Cr in the chromium slag
6+Content and other chemical ingredients and content see Table 1.
Table 1 chromium dreg chemistry composition and content (quality %)
The used bottom mud in lake of the present invention is black, and is smelly, the soil property exquisiteness, and the core tangent plane is smooth, contains more soil ulmin, and stream is moulded shape and is contained a large amount of organism, and its organic composition is up to 70%～85%.
2, drying: with chromium slag and bottom mud in lake in temperature is controlled at 100～110 ℃ drying baker, dry respectively to moisture less than 8wt%, the time is 1.5～3 hours; Grind after the cooling and cross 80～100 mesh sieves respectively.
3, reduction decomposition process
The test material places reactor, and reaction process does not have forced draft and passes through, and belongs to semiclosed shape, and along with the carrying out of process, system will be in anoxic condition, and the principal reaction that takes place under this state is as follows:
(1) temperature control is by normal temperature to 500～900 ℃, and all below the material fusing point, so system mainly is in the gas-solid reaction process;
(2) under effect, mainly be the intensification and the moisture evaporation of material, i.e. dehydration below the temperature rise to 200 ℃ at microwave;
(3) rise when the temperature continuation, can produce organic decomposition and cracking in succession, and produce following reaction at certain condition, for example:
C+O
2＝CO
2
C+CO
2＝CO
2CO+O
2＝2CO
2
C+H
2O
(g)＝CO+H
2
These reactions generate a series of gaseous reducing agents, and hexavalent chrome reduction is a trivalent chromium, reaches the toxicide purpose.At CrO
3→ Cr
2O
3Pyrolytic process in, CrO
3Decompose and discharge oxygen, Cr since 180 ℃
6+Degraded one by one is until last generation Cr
2O
3, produced following transition thing phase in this process: positive chromic acid chromium, Cr
2(Cr
10O
31) be reduced to CrO
2.906Dichromic acid chromium Cr
2(Cr
2O
7)
3, i.e. CrO
2.625Single chromic acid chromium Cr
2(CrO
4)
3Be reduced to CrO
2.4Through the X-diffraction analysis, as follows with temperature rising intermediate facies evolution process:
From above-mentioned pyrolyzate phase change process, the CrO that thermostability is very poor
3Pyrolysis one by one when heating up, the final Cr that generates good thermal stability during to 800 ℃
2O
3As temperature Cr more than 750 ℃ the time
2O
3Be stable phase.With CrO
3Relatively, Cr
2O
3Be very stable compound, so experimental temperature is defined as 800～1100 ℃ in the present invention.
Embodiment 1:
In reactor (ceramic crucible), pack into 10g chromium slag and 1.0g bed mud, and mix, reactor is put into microwave oven then, be incubated with the slag wool lagging material around the reactor, adopt the temperature in the armour formula thermocouple measurement microwave field of being with shielding, be warmed up to 800 ℃, close microwave oven behind the insulation 40min, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and filtrate is settled to 250ml, measure Cr in the filtrate with diphenyl carbazide spectrophotometry
6+Concentration calculates Cr
6+The detoxifcation rate is 99.439%.
Embodiment 2:
In reactor (ceramic crucible), pack into 10g chromium slag and 2.5g bed mud, and mix, reactor is put into microwave oven then, be incubated with the slag wool lagging material around the reactor, adopt the temperature in the armour formula thermocouple measurement microwave field of being with shielding, be warmed up to 900 ℃, close microwave oven behind the insulation 35min, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and filtrate is settled to 250ml, measure Cr in the filtrate with diphenyl carbazide spectrophotometry
6+Concentration calculates Cr
6+The detoxifcation rate is 99.525%.
Embodiment 3:
In reactor (ceramic crucible), pack into 10g chromium slag and 5.0g bed mud, and mix, reactor is put into microwave oven then, be incubated with the slag wool lagging material around the reactor, adopt the temperature in the armour formula thermocouple measurement microwave field of being with shielding, be warmed up to 1000 ℃, close microwave oven behind the insulation 30min, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and filtrate is settled to 250ml, measure Cr in the filtrate with diphenyl carbazide spectrophotometry
6+Concentration calculates Cr
6+The detoxifcation rate is 99.968%.
Embodiment 4:
In reactor (ceramic crucible), pack into 10g chromium slag and 8.0g bed mud, and mix, reactor is put into microwave oven then, be incubated with the slag wool lagging material around the reactor, adopt the temperature in the armour formula thermocouple measurement microwave field of being with shielding, be warmed up to 1100 ℃, close microwave oven behind the insulation 25min, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and filtrate is settled to 250ml, measure Cr in the filtrate with diphenyl carbazide spectrophotometry
6+Concentration calculates Cr
6+The detoxifcation rate is 99.987%.
Claims (5)
1, a kind of method of utilizing lake sediment in microwave detoxification of chromium slags, it is characterized in that: in reactor, pack into by a certain percentage chromium slag and bed mud, and mix, then reactor is put into microwave oven, measure the temperature in the microwave field, after treating that temperature is raised to 800～1100 ℃, close microwave oven behind insulation 25～40min, open fire door behind the 10min, after treating the material cooling, material is immersed in the distilled water, soak the 24h after-filtration, and with the filtrate constant volume.
2, the method for utilizing lake sediment in microwave detoxification of chromium slags according to claim 1 is characterized in that described reactor is a ceramic crucible.
3, the method for utilizing lake sediment in microwave detoxification of chromium slags according to claim 1 is characterized in that the armour formula thermocouple measurement that the temperature in the described measurement microwave field can adopt band to shield.
4, the method for utilizing lake sediment in microwave detoxification of chromium slags according to claim 1 is characterized in that being incubated with the slag wool lagging material around the described reactor.
5, the method for utilizing lake sediment in microwave detoxification of chromium slags according to claim 1 is characterized in that described filtrate constant volume is that filtrate is settled to 250ml, with the Cr in the diphenyl carbazide spectrophotometry mensuration filtrate
6+Concentration, and conversion accounts for the percentage ratio of sample chromium slag amount for the sexavalent chrome quality that leaches, thus calculate the detoxifcation rate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100944820A CN101549894A (en) | 2009-05-21 | 2009-05-21 | Method of using lake sediment in microwave detoxification of chromium slags |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100944820A CN101549894A (en) | 2009-05-21 | 2009-05-21 | Method of using lake sediment in microwave detoxification of chromium slags |
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| Publication Number | Publication Date |
|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039616A (en) * | 2015-09-08 | 2015-11-11 | 华北理工大学 | Coprocessing method for AOD stainless steel residues stored in piles and LF refining residues |
| CN105149329A (en) * | 2015-10-28 | 2015-12-16 | 内江师范学院 | Harmless treatment method used for chromium salt slag |
| CN105200172A (en) * | 2015-09-08 | 2015-12-30 | 华北理工大学 | Synergistic processing method of stacked EAF stainless steel slag and LF refining slag |
| CN106673682A (en) * | 2016-12-30 | 2017-05-17 | 钢研晟华工程技术有限公司 | Method for producing iron alloy and refractory material by utilizing solid wastes |
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2009
- 2009-05-21 CN CNA2009100944820A patent/CN101549894A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039616A (en) * | 2015-09-08 | 2015-11-11 | 华北理工大学 | Coprocessing method for AOD stainless steel residues stored in piles and LF refining residues |
| CN105200172A (en) * | 2015-09-08 | 2015-12-30 | 华北理工大学 | Synergistic processing method of stacked EAF stainless steel slag and LF refining slag |
| CN105200172B (en) * | 2015-09-08 | 2017-08-25 | 华北理工大学 | Store up the cooperative processing method of EAF stainless steel slags and LF refining slag |
| CN105039616B (en) * | 2015-09-08 | 2017-09-26 | 华北理工大学 | Store up the cooperative processing method of AOD stainless steel slags and LF refining slag |
| CN105149329A (en) * | 2015-10-28 | 2015-12-16 | 内江师范学院 | Harmless treatment method used for chromium salt slag |
| CN105149329B (en) * | 2015-10-28 | 2017-04-26 | 东营海容新材料有限公司 | Harmless treatment method used for chromium salt slag |
| CN106673682A (en) * | 2016-12-30 | 2017-05-17 | 钢研晟华工程技术有限公司 | Method for producing iron alloy and refractory material by utilizing solid wastes |
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